Entries |
Document | Title | Date |
20080232144 | Soft start circuit with slew rate controller for voltage regulators - In one embodiment, a soft start circuit includes a slew rate controller to limit inrush current to a voltage regulator during start up. The output voltage of the regulator may be compared to a previous sampled value to determine the slew rate of the output voltage. The slew rate of the output voltage may be controlled by adjusting the current limit of the regulator. The current limit of the regulator may be adjusted using digital circuits, such as a counter and a digital to analog converter, or analog circuits using a pulsed current source, for example. The slew rate may be controlled to exceed a target slew rate or to stay within a range of slew rate limits. | 09-25-2008 |
20080310196 | Method for controlling startup cycle and circuit of using the same - The present invention discloses a method and a circuit for controlling a start-up cycle of an integrated circuit in a circuit system. The method and circuit determine whether or not an input power of the circuit system and a bias voltage power of the integrated circuit have reached a normal operating voltage range to control the bias voltage power to produce a start-up cycle of the integrated circuit. The method and circuit also provides a protection mechanism for an overload of the circuit system overload, so that the integrated circuit can moderate surges and prevent damages. | 12-18-2008 |
20080310197 | POWER SUPPLY INPUT DEVICE - A power supply input device including a first resistance of a discharge resistance conversion unit connected in parallel to a discharge resistance unit; and a switching unit of the discharge resistance conversion unit connected to the first resistance and performing a switching operation according to an externally received control signal, thus minimizing power losses occurring when a system is in a standby mode. | 12-18-2008 |
20090021965 | ELECTRONIC DEVICE CAPABLE OF SUPPLYING POWER BI-DIRECTIONALLY THROUGH PORT AND METHOD OF OPERATING THE SAME - An electronic device having a main body with a system load and capable of supplying power bi-directionally through a port, and an operation method thereof, the electronic device including: a power control apparatus to recognize a connection of an external power source for supplying power to the system load, and to control a startup of the external power source and a distribution of the power supplied from the external power source. | 01-22-2009 |
20090086516 | Architecture for switching on and off power - An architecture for switching on and off power, which applies to a power supply has a power factor regulation unit, a primary power system, and a regular power system. The regular power system provides the primary power system with a regular power to start the primary power system. The regular power system includes: a voltage detection unit generating a driving signal signifying and a regular power output unit receiving the driving signal and outputting the regular power. The voltage detection unit connects with a logic signal switch. The logic signal switch controls the voltage detection unit to determine whether the driving signal is normally output to the regular power output unit or coercively interrupted. Thereby, the power supply can be coercively switched off. As the driving signal has a smaller current, the liability of electric shock is decreased, and the volume and cost of the logic signal switch is reduced. | 04-02-2009 |
20090116267 | Driving system for switching power supply - A driving system for an electrical power conversion equipment includes a driving circuit for driving a switching device provided in the electrical power conversion equipment, and a driving capacity control circuit for controlling a driving capacity of the driving circuit. The driving capacity during a resonant operation of the electrical power conversion equipment becomes higher than that at a start of the resonant operation when the switching device is turned-on. | 05-07-2009 |
20090129127 | METHODS AND DEVICES FOR INHIBITING NEGATIVE OUTPUT CURRENT DURING START-UP OF A SWITCH MODE POWER SUPPLY - A method of controlling a freewheel switch during start-up of a switch mode power supply to inhibit negative output current. The switch mode power supply has alternating first and second intervals. The freewheel switch has an ON-time and an OFF-time. The method includes gradually increasing the ON-time of the freewheel switch over a plurality of said intervals during start-up of the switch mode power supply until the ON-time of the freewheel switch is substantially equal to a duration of the second interval. | 05-21-2009 |
20090129128 | Uninterruptible power supply apparatus - An uninterruptible power supply device connects a battery for power-outage backup to the output side of an AC/DC converter. An input monitoring circuit monitors alternating current input of the AC/DC converter and outputs an alternating current input monitor signal E | 05-21-2009 |
20090141521 | Method and apparatus of providing synchronous regulation for offline power converter - A synchronous regulation circuit is provided to improve the efficiency for an offline power converter. A secondary-side switching circuit is coupled to the output of the power converter to generate a synchronous signal and a pulse signal in response to an oscillation signal and a feedback signal. An isolation device transfers the synchronous signal from the secondary side to the primary side of the power converter. A primary-side switching circuit further receives the synchronous signal to generate a switching signal for soft switching a transformer. The pulse signal is utilized to control a synchronous switch for rectifying and regulating the power converter. The synchronous switch includes a power switch and a control circuit. The control circuit receives the pulse signal for turning on/off the power switch. The power switch is connected in between the transformer and the output of the power converter. In addition, a flyback switch is operated as a synchronous rectifier to freewheel the inductor current of the power converter. The flyback switch is turned on in response to the off of the power switch. The on time of flyback switch is correlated to the on time of the power switch. | 06-04-2009 |
20090147550 | FULL DIGITAL SOFT-START CIRCUIT AND POWER SUPPLY SYSTEM USING THE SAME - A full digital soft-start circuit adapted for a power supply system is provided. The full digital soft-start circuit includes a ring oscillator, a pulse generator, a counter, and a multiplexer. The ring oscillator generates a plurality of clock signals which are different in phase, while equivalent in duty cycle and frequency. The pulse generator generates a plurality of pulse signals with different duty cycles. The counter generates a multi-bit counting signal. The multiplexer determines whether to transmit the pulse signals generated by the pulse generator so as to generate an output pulse which becomes stable as time going on. | 06-11-2009 |
20090147551 | Pilot control of a voltage source converter - An apparatus for controlling a converter has an ignition unit connected to power semiconductors in the converter and provides control signals for actuating the semiconductors. The apparatus has a control unit whose input is connected to measuring sensors providing actual values and whose output side is connected to the ignition unit. The control unit provides a reference variable for the ignition unit based on setpoint values and the actual values and the ignition unit actuates the power semiconductors such that the actual value corresponds to at least one of the setpoint values. A pilot unit has an output connected to the ignition unit and measures for calculating a step change reference variable for the ignition unit on the basis of at least one of the setpoint values. The ignition unit actuates the power semiconductors based on the step change reference variable. | 06-11-2009 |
20090185399 | ACTIVE START JUDGMENT CIRCUIT - An active start judgment circuit is electrically connected to an AC/DC transforming power supply which has at least one standby power unit to transform AC to DC in regular conditions and a main power unit to transform the AC to the DC in an ON condition for operation of an electronic equipment. The start judgment circuit bridges the standby power unit and the main power unit, and generates a reference potential based on a voltage output from the standby power unit, and gets a power signal from the standby power unit to be compared with the reference potential to output a start signal to the main power unit to transform the AC to the DC. Thus the standby power unit can actively drive the main power unit to supply DC power to activate the electronic equipment. | 07-23-2009 |
20090213623 | METHOD AND APPARATUS OF PROVIDING SYNCHRONOUS REGULATION CIRCUIT FOR OFFLINE POWER CONVERTER - A synchronous regulation circuit is provided. A secondary-side switching circuit is coupled to the output of the power converter to generate a synchronous signal and a pulse signal in response to an oscillation signal and a feedback signal. An isolation device transfers the synchronous signal from the secondary side to the primary side of the power converter. A primary-side switching circuit receives the synchronous signal to generate a switching signal for soft switching a transformer. The pulse signal is utilized to control a synchronous switch for rectifying and regulating the power converter. The synchronous switch includes a power switch and a control circuit. The control circuit receives the pulse signal for turning on or off the power switch. The power switch is connected between the transformer and the output of the power converter. A flyback switch is operated as a synchronous rectifier to freewheel the inductor current of the power converter. The flyback switch is turned on in response to the off state of the power switch. The turn-on period of flyback switch is correlated to the turn-on period of the power switch. | 08-27-2009 |
20090213624 | AUDIO APPARATUS, SWITCHING POWER SUPPLY, AND SWITCHING CONTROL METHOD - When power is turned on and in a state in which a power supply voltage is not supplied from the switching power supply to the second clock generating section, the first clock generating section generates a first clock signal with a frequency that is preset in the first clock generating section, without using a third clock signal from the frequency dividing section, to cause the first switching section to operate. By the first switching section operating, a power supply voltage is supplied from the switching power supply to the second clock generating section. After the second clock generating section has started to operate, a third clock signal (a clock signal obtained by dividing the frequency of a second clock signal generated by the second clock generating section) is supplied from the frequency dividing section to the first clock generating section. The first clock generating section generates a first clock signal with a frequency that is synchronized with the frequency of the third clock signal, to cause the first switching section to operate. | 08-27-2009 |
20090237965 | SEMICONDUCTOR DEVICE FOR SWITCHING POWER SUPPLY CONTROL, STARTUP CIRCUIT, AND STARTUP METHOD FOR SWITCHING POWER SUPPLY DEVICE - A semiconductor device for switching power supply control limits the startup current supplied from a high-voltage input terminal, and prevents heat generation and combustion in case of an anomaly. A high-voltage input terminal is connected to the main winding of a transformer, and is supplied with a startup voltage upon input of a power supply to the switching power supply device. A power supply terminal is connected to a capacitor, and outputs a startup current to charge the capacitor after input of the power supply input. A startup circuit is connected between the high-voltage input terminal and the power supply terminal, and charges the capacitor while increasing the startup current with magnitude proportional to the voltage value of the power supply terminal, and after startup, turns off the startup current and supplies the power supply voltage only from the auxiliary winding of the transformer. | 09-24-2009 |
20090268488 | Semiconductor device for controlling switching power supply - A semiconductor device controls a switching power supply. The semiconductor device includes a current inflow terminal; a starter circuit to cause a starting current to flow from the current inflow terminal to a power supply terminal to charge a capacitor externally connected to the power supply terminal; a control unit which controls the starter circuit to turn on to charge the capacitor with the starting current and controls the starter circuit to turn off to perform brown-out detection; a comparator which detects a brown-out state while the starter circuit is turned off; and a brown-out detection unit which receives output signals from the comparator and the control unit as inputs. The brown-out detection is performed while the starter circuit is off, so that the current inflow terminal for the starter circuit is used in common as a voltage detection terminal for detection of the brown-out state. | 10-29-2009 |
20090273953 | Inverter - An inverter includes a pulse width modulation (PWM) circuit, a direct current (DC) voltage input terminal, a storage capacitor, a first transformer, a soft start circuit, and a first transistor. The PWM circuit includes a first output terminal. The first transformer includes a first primary winding. The first primary winding includes a first terminal and a second terminal capable of being grounded via the storage capacitor. The soft start circuit includes an inductor and a first capacitor. A gate electrode of the first transistor is connected to the first output terminal. A source electrode of the first transistor is connected to the first terminal of the first transformer via the inductor. A drain electrode of the first transistor is connected to the DC voltage input terminal and connected to the source electrode via the capacitor. | 11-05-2009 |
20090290393 | Data exchange between inverters in an inverter system - The invention relates to an inverter system ( | 11-26-2009 |
20090323376 | SEMICONDUCTOR DEVICE, INTEGRATED CIRCUIT INCLUDING THE SEMICONDUCTOR DEVICE, CONTROL IC FOR SWITCHING POWER SUPPLY AND THE SWITCHING POWER SUPPLY - A semiconductor device incorporates a resistor on a structure that uses diffusion layers for sustaining the breakdown voltage thereof to realizes a very resistive element that exhibits a high breakdown voltage and high electrical resistance, includes a spiral very resistive element buried in an interlayer insulator film. A first end of the very resistive element is connected to a drain electrode wiring and the second end of the very resistive element is grounded. An intermediate point of the very resistive element is connected to ae voltage comparator of a control IC. The semiconductor device according to the invention facilitates reducing the components parts costs, assembly costs and size of a switching power supply that includes a very resistive element. | 12-31-2009 |
20100014327 | CURRENT CONTROL TYPE CONVERTER - A current control type converter has a converter section and a control section that includes three controllers. A first controller calculates and outputs an active current instruction value by proportional-plus-integral control to perform proportional integration of a deviation between the value of a DC voltage outputted from the converter section and a DC voltage instruction value. A second controller calculates and outputs an active voltage correction value by proportional-plus-integral control to perform proportional integration of a deviation between the active current instruction value from the first controller and the value of an active current inputted to the converter section. A third controller calculates and outputs a reactive voltage correction value by proportional-plus-integral control to perform proportional integration of a deviation between the value of a reactive current inputted to the converter section and a reactive current instruction value. | 01-21-2010 |
20100020575 | SWITCHING POWER SUPPLY DEVICE - A switching power supply device includes: a transformer having a primary winding, a secondary winding and an auxiliary winding; a switching element connected to the primary winding of the transformer; a control circuit that performs an ON/OFF control for the switching element in a case where a voltage is inputted to the primary winding of the transformer, thereby induces voltages in the secondary winding and auxiliary winding of the transformer; a rectifying/smoothing circuit for rectifying and smoothing the voltage induced in the secondary winding of the transformer and outputting the voltage to a load; an auxiliary power supply circuit that rectifies and smoothes the voltage induced in the auxiliary winding of the transformer, and charges a capacitor owned by the auxiliary power supply circuit with the voltage to thereby supply power to the control circuit; and a starting circuit that supplies a current to the capacitor of the auxiliary power supply circuit in a case of starting the control circuit and in a case where the load is light and the switching element is turned off. | 01-28-2010 |
20100046256 | Rush Current Reduction Circuit and Electric Appliance - An output node at a plus side of a diode bridge (DB | 02-25-2010 |
20100067265 | ELECTRONIC SYSTEM AND POWER SUPPLY DEVICE THEREOF - In an electronic system and a power supply device thereof, the power supply device supplies electric power to an electronic device in the electronic system. When the electronic device is shut down, the electronic device transmits a shutdown signal to the power supply device, so that the power supply device stops supplying electric power to the electronic device. And, when the electronic device is switched on, the electronic device transmits a start signal to the power supply device, so that the power supply device starts supplying electric power to the electronic device. Therefore, power consumption by the power supply device when the electronic device is shut down can be reduced. | 03-18-2010 |
20100091530 | DC/DC CONVERTER - A DC-DC converter includes a control circuit which can change the target voltage of the reference voltage source. At the start-up of the DC-DC converter, the PWM control circuit controls so that the first switching element gradually increases the on-off ratio from a minimum on-off ratio; that the second switching element is placed in the OFF state, and that the target voltage is set higher than the normal operating voltage. When the start-up operation is completed, the PWM control circuit controls so that the second switching element starts to turn on and off, and that the target voltage is returned to the normal operating voltage. | 04-15-2010 |
20100172163 | HIGH VOLTAGE PROTECTION FOR A THIN OXIDE CMOS DEVICE - A circuit includes a voltage regulator ( | 07-08-2010 |
20100195356 | ELECTRONIC DEVICE AND EXTERNAL POWER SUPPLY DEVICE CONTROL METHOD APPLICABLE THERETO - An electronic device and an external power supply device control method applicable to the electronic device are disclosed. The electronic device is electrically connected to an external power supply device that is able to switch between an ON state and an OFF state. The electronic device includes a switch module and an internal power module. The switch module, when being triggered, generates a switch signal. The internal power module receives the switch signal and accordingly generates a trigger signal to the external power supply device, so that the external power supply device is triggered to switch from the OFF state to the ON state and accordingly supplies electric power to the electronic device. | 08-05-2010 |
20100202169 | Protection and clamp circuit for power factor correction controller - A controller generates a drive signal for a converter circuit that includes an active component (i.e., transistor) that is selectively controlled to convert a rectified input to direct current (DC) output. The controller employs an outer feedback loop (based on monitored output voltage of the converter circuit), an inner feedback loop (based on monitored AC input current drawn by the converter circuit), and a pulse width modulator (PWM) to generate the drive signals necessary to generate the desired DC output voltage and to provide power factor correction to the converter circuit. In particular, the inner feedback loop includes an amplifier and a fault protection and clamp circuit. The amplifier has a first input connected to receive a feedback signal representing the monitored AC input current, a second input, and an output that provides a current feedback signal to the PWM. The fault protection and clamp circuit is connected to monitor the voltage at the second input of the PWM and to detect fault conditions associated with the converter circuit, wherein in response to an over-voltage condition at the second input or a detected fault condition the fault protection and claim circuit clamps the current feedback signal provided to the second input of the PWM to a reference value and provides the reference value in feedback to either the first or second input of the amplifier. | 08-12-2010 |
20100220506 | CONTROL CIRCUIT FOR SWITCHING POWER SUPPLY - A control circuit for a switching power supply (SPS) includes power input and output interfaces, a relay, a relay driving circuit, a microprocessor, and an alternating current/directing current (AC/DC) converter. The power input interface receives an external alternating current (AC) power signal, and transmits the AC power signal to the SPS via the power output interface. The AC/DC converter transforms the AC power signal into a direct current (DC) power signal to supply for the relay, the relay driving circuit, and the microprocessor. When a computer is turned on, the microprocessor sends a first control signal to control the relay driving circuit to drive the relay to connect the power input and output interfaces. When the computer is turned off, the microprocessor sends a second control signal to control the relay driving circuit to drive the relay to cut off connection between the power input and output interfaces. | 09-02-2010 |
20100259955 | SOFT SWITCHING POWER CONVERTER - The present invention provides a soft switching power converter that turns the switching operations of the semiconductor elements used for all the switching into soft switching operations with the use of a magnetic energy recovering switch that has a small-capacity magnetic energy storing capacitor connected between DC terminals of a bridge circuit formed with at least two reverse-conduction semiconductor switches. A high-frequency boost pulse voltage generated by the magnetic energy recovering switch is regarded as the voltage of a DC link portion. The soft switching power converter converts the voltage into DC or AC of arbitrary low frequency through a filter or a switching control unit. With this structure, the switching operations of the semiconductor elements used for all the switching are turned into soft switching operations. Accordingly, the power converter is capable of boosting or lowering the output voltage, and serves as a reversible power converter that is formed with a relatively small number of components and a simple control unit. | 10-14-2010 |
20100290257 | START-UP CIRCUIT FOR POWER CONVERTERS WITH WIDE INPUT VOLTAGE RANGE - A start-up circuit includes a switching-device control circuit arranged to receive an input voltage and to provide a switching-device control signal, a switching device arranged to be controlled by the switching-device control signal and to provide a start-up signal, a power-converter control circuit arranged to receive the start-up signal and to provide a power-converter control signal, and a power converter arranged to receive the power-converter control signal and to provide an auxiliary output signal. The switching control circuit is arranged to receive the auxiliary output signal such that, when the auxiliary output signal reaches a predetermined level, the switching-device control circuit stops providing the switching-device control signal. | 11-18-2010 |
20100309694 | Start-up Circuit to Discharge EMI Filter for Power Saving of Power Supplies - A start-up circuit to discharge EMI filter is developed for power saving. It includes a detection circuit detecting a power source for generating a sample signal. A sample circuit is coupled to the detection circuit for generating a reset signal in response to the sample signal. The reset signal is utilized for discharging a stored voltage of the EMI filter. | 12-09-2010 |
20110013431 | SWITCHING POWER CONVERSION CIRCUIT AND POWER SYPPLY USING SAME - A switching power conversion circuit receives an input voltage and generates an output voltage to a system circuit. The switching power conversion circuit includes a power circuit, a feedback circuit, a control circuit, and an initiation circuit. The power circuit includes a first switch circuit. The feedback circuit generates a feedback signal according to a power-status signal and the output voltage. The first switching circuit is conducted or shut off according to the feedback signal under control of the control circuit, so that the input voltage is converted into the output voltage and the first auxiliary voltage by the power circuit. If the power-status signal is in an off status, a ratio of the feedback signal to the output voltage is equal to a first feedback ratio and the magnitude of the first auxiliary voltage is lower than a normal operating voltage value, so that the control circuit is disabled. | 01-20-2011 |
20110090720 | UNIT INVERTER SYSTEM - In a unit inverter system where multiple unit inverters are connected in parallel, the quantity of operating unit inverters is determined in accordance with an amount of power to be converted. A gate signal of a semiconductor switching element of a unit inverter is turned off after an output current of the inverter is reduced when reducing the quantity of inverter units, thereby improving the partial load efficiency of the system without an adverse effect on the system. A regulator connected to the inverter determines dead time of the inverter according to the output current value and an average output current value of the unit inverters, waits for the determined dead time so as to reduce the output current of the unit inverter, and then turns off the gate signal. | 04-21-2011 |
20110116288 | APPARATUS FOR PROVIDING ZERO STANDBY POWER CONTROL IN AN APPLIANCE - An apparatus is provided that includes first and second switches in line between an appliance and terminals of the appliance that are connectable to a power source. The first switched is configured to open and close based on closing and opening of a door of the appliance, and the second switch is configured to open and close based on the mode of the appliance. Thus, the appliance may be connected to the power source when the first switch or the second switch is closed, and disconnected from the power source when both the first switch and the second switch are open. The apparatus further includes a third switch connected to the second switch and configured to control the second switch to close upon actuation of the third switch by a user, where actuation of the third switch may cause the appliance to enter an operational mode. | 05-19-2011 |
20110116289 | METHOD AND APPARATUS OF LOW CURRENT STARTUP CIRCUIT FOR SWITCHING MODE POWER SUPPLIES - A startup circuit for a switching-mode power supply (SMPS) includes a first voltage detector configured to trigger the switching-mode power supply from a first operation mode to a second operation mode when an input supply voltage exceeds a first threshold voltage, a current consumption in the first voltage detector in the first operation mode being determined by a reverse leakage current of a diode. A feedback circuit is coupled to the first voltage detector and being capable of maintaining a positive feedback loop. A second voltage detector is coupled to the first voltage detector and the feedback circuit, and is configured to trigger the switching-mode power supply to switch from the second operation mode to the first operation mode when the input supply voltage is below a second threshold voltage. | 05-19-2011 |
20110122662 | Buck and buck/boost converter systems having auxiliary circuits and method thereof - The configurations of a buck type and a buck/boost type converter systems and a controlling method thereof are provided in the present invention. The proposed buck/boost type converter system includes a rectifier bridge, a first auxiliary circuit including a first unidirectional switch coupled to the rectifier bridge and a second unidirectional switch coupled to the first unidirectional switch, a first capacitor coupled to the first unidirectional switch and the rectifier bridge, a buck/boost converter having a first input terminal coupled to the first unidirectional switch, a second input terminal coupled to the first capacitor, a first output terminal coupled to the second unidirectional switch and a second output terminal, a second capacitor electrically connected to the first and the second output terminals in parallel, and a DC source coupled to the second unidirectional switch. | 05-26-2011 |
20110134664 | Startup Circuit and Power Converter Employing the Same - A startup circuit with reduced power dissipation, method of operating the same and a power converter employing the startup circuit. In one embodiment, the startup circuit for a controller includes a charge accumulation circuit having a resistor series-coupled to a capacitor and a first Schmitt trigger having an input coupled to the capacitor. The startup circuit also includes a second Schmitt trigger having an input coupled to an output of the first Schmitt trigger and configured to provide a bias voltage for the controller via the capacitor when an input voltage thereto exceeds a trip voltage. | 06-09-2011 |
20110134665 | Low-voltage start up circuit and method for DC-DC boost converter - A start up circuit ( | 06-09-2011 |
20110141775 | NON-DISSIPATIVE START UP CIRCUIT - A start up circuit constituted of: a first alternating current lead; a second alternating current lead, said second alternating current lead exhibiting an opposing phase of said first alternating current lead; a first capacitor, a first end of said first capacitor coupled to said first alternating current lead; a second capacitor, a first end of said second capacitor coupled to said second alternating current lead; a breakdown diode coupled between a second end of said first capacitor and a second end of said second capacitor; and a third capacitor coupled in parallel with said breakdown diode. A direct current power is developed across the breakdown diode without requiring dissipative elements. | 06-16-2011 |
20110176341 | START-UP CIRCUIT TO DISCHARGE EMI FILTER OF POWER SUPPLIES - A start-up circuit to discharge EMI filter is developed for power saving. It includes a detection circuit detecting a power source for generating a sample signal. A sample circuit is coupled to the detection circuit for generating a reset signal in response to the sample signal. The reset signal is utilized for discharging a stored voltage of the EMI filter. | 07-21-2011 |
20110182091 | SYNCHRONIZATION DETECTING CIRCUIT AND AUTOMATIC SYNCHRONOUS PARALLELIZATION APPARATUS - An automatic synchronous parallelization apparatus capable of suppressing an inrush current by automatically adjusting the magnitude, the frequency, and the phase of the voltage when a single-phase voltage-type DC-to-AC converting device performing an autonomous parallel operation is connected in parallel with an external single-phase AC voltage source. The automatic synchronous parallelization apparatus includes a synchronization detecting circuit, a voltage amplitude command value generating circuit, and a frequency command value generating circuit. The voltage amplitude command value generating circuit generates the 1st-axis voltage command value, and the frequency command value generating circuit generates the 2nd-axis voltage command value, based on a value relating to a frequency difference between an external single-phase AC voltage source and a single-phase voltage-type DC-to-AC converting device and an effective value of a voltage of the external single-phase AC voltage source that are detected by synchronization detecting circuit. By using such command values, an output of the single-phase voltage-type DC-to-AC converting device can be adjusted to as to coincide with a voltage waveform of the external single-phase AC voltage source. | 07-28-2011 |
20110188274 | FAULT CONDITION PROTECTION - A regulator for a switched mode power supply includes switching regulator logic, a counter and a switching transistor. The switching regulator logic is coupled to receive a feedback signal and to generate a switching signal in response. The feedback signal periodically cycles between a first state and a second state when the power supply operates normally. The counter is coupled to receive the feedback signal and an output of the counter indicates an auto-restart mode of the regulator in response to the feedback signal remaining in the first state for a predetermined count. The switching transistor is turned on and off in response to the switching signal when the output of the counter does not indicate the auto-restart mode and is disabled when the output of the counter indicates the auto-restart mode. | 08-04-2011 |
20110188275 | METHOD FOR STARTING UP DC-DC CONVERTER - Aspects of the invention provide a method for starting up a DC-DC converter by which an output voltage can be prevented from overshooting and body diodes of switching devices can be prevented from reverse recovery. In the start-up method, the phases of gate signals of third and fourth switching devices are gradually shifted relative to the phases of gate signals of first and second switching devices. With increase of the phase shift, a voltage on a primary side of a transformer is also increased, and an output voltage is also increased. | 08-04-2011 |
20110205767 | METHOD FOR CONTROLLING A MULTIPHASE INTERLEAVING CONVERTER AND CORRESPONDING CONTROLLER - A method is provided for controlling a converter of the multiphase interleaving type. According to the method, there is detected when a change of the load applied to an output terminal of the converter occurs. All the phases of the converter are simultaneously turned off, and a driving interleaving phase shift is recovered so as to restart a normal operation of the converter. A controller for carrying out such a method is also provided. | 08-25-2011 |
20110205768 | CHAIN-LINK CONVERTER, METHOD FOR STARTING CHAIN-LINK CONVERTER AND STATIC COMPENSATOR SYSTEM - A chain-link converter including one or more phases. The one or more phases each includes one or more series-connected converter cells. The chain-link converter includes a power source connected to a converter cell of one of the one or more phases. A cost-efficient start-up of the converter is provided. The invention also relates to a corresponding static compensator system and a method. | 08-25-2011 |
20110222322 | DIGITAL DEVICE WITH BOOT STRAP CIRCUIT STIMULATOR - A digital device generates a fixed duty cycle signal with an internal oscillator after a Power-On-Reset (POR). This fixed duty cycle signal is output on a signal pin that normally is used for a PWM control signal. The fixed duty cycle signal is used to stimulate the voltage generation circuits so as to power up the digital device for initialization thereof. Once the digital device has powered-up and initialized, the digital device switches over to normal operation for control of the power system. | 09-15-2011 |
20110228575 | JUNCTION FIELD EFFECT TRANSISTOR, INTEGRATED CIRCUIT FOR SWITCHING POWER SUPPLY, AND SWITCHING POWER SUPPLY - A switching power supply has a start-up circuit that includes a field effect transistor (JFET), which has a gate region (a p-type well region) formed in a surface layer of a p-type substrate and a drift region (a first n-type well region). A plurality of source regions (second n-type well regions) are formed circumferentially around the drift region. A drain region (a third n-type well region) is formed centrally of the source region. The drain region and the source regions can be formed at the same time. A metal wiring of the source electrode wiring connected to source regions is divided into at least two groups to form at least two junction field effect transistors. | 09-22-2011 |
20110255315 | SWITCHING POWER SUPPLY DEVICE - A switching power supply device ensuring no voltage dip is caused by a sink current even if started with output voltage accumulated. When input voltage Vi is reapplied with output voltage Vo accumulated, supplying PWM signals to main switching element | 10-20-2011 |
20110305051 | START-UP CIRCUIT WITH LOW STANDBY POWER LOSS FOR POWER CONVERTERS - A start-up circuit with low standby power loss for power converters according to present invention comprises a first diode and a second diode coupled to an input voltage of the power converter. A start-up resistor is coupled to the join of the first diode and the second diode. A high-voltage switch is coupled to the start-up resistor to generate a power source. A control circuit generates a switching signal for switching a transformer. A detection circuit generates a disable signal in response to the input voltage to disable the switching signal. A winding of the transformer is coupled to the power source to generate the power for the power source. The high-voltage switch is turned off to cut off the start-up resistor for saving the power loss once the voltage of the power source is higher than a threshold. | 12-15-2011 |
20120014145 | STARTUP CIRCUIT - A startup circuit is installed in a switching power source apparatus. The startup circuit is configured to start up a controller with the use of a rectified voltage at startup of an AC power source and includes a detector (ZD | 01-19-2012 |
20120026762 | Pre-Bias Control for Switched Mode Power Supplies - An embodiment of the invention provides a method of reducing a drop in voltage on a pre-biased output of a DC-DC step-down switching converter. A high side switch is activated to conduct a first current to the pre-biased output. After the high side switch is activated, a low side switch is activated to draw a second current from the pre-biased output such that the magnitude of the first current is greater than the magnitude of the second current for at least a portion of a time period T | 02-02-2012 |
20120057379 | POWER SUPPLY CIRCUIT FOR REMOTELY TURNING-ON ELECTRICAL APPLIANCES - A power supply circuit for an electrical appliance, including a turning-on stage configured for determining a transition from a turned-off state, in which the power supply circuit is off and does not supply electric power, to a turned-on state of the power supply circuit. The turning-on stage includes a transducer of the remote-control type configured for triggering the transition in response to the reception of a wireless signal. | 03-08-2012 |
20120099350 | METHOD AND APPARATUS TO SELECT A PARAMETER/MODE BASED ON A MEASUREMENT DURING AN INITIALIZATION PERIOD - An integrated circuit includes a threshold detection circuit that is coupled to measure a signal from a first resistive external circuit coupled between a fourth external terminal of the integrated circuit and a first external terminal of the integrated circuit during a duration of an initialization period after the fourth external terminal has been charged to a supply threshold value. A regulator circuit is coupled to charge the fourth external terminal to the supply threshold value during the initialization period of the integrated circuit. A selection circuit is coupled to the threshold detection circuit to select a parameter/mode of the integrated circuit in response to the signal measured from the first resistive external circuit during the duration of the initialization period after the fourth external terminal has been charged to the supply threshold value. | 04-26-2012 |
20120120688 | STARTUP CIRCUIT FOR DC-DC CONVERTER - A startup circuit for use in a DC-DC converter having an input voltage terminal and an output voltage terminal, with the output voltage terminal connected to an output capacitor and with said converter including a pass transistor for transferring charge from the input terminal to the output terminal. The startup circuit includes a control circuit configured to cause the pass transistor to conduct an output current during start up when the output terminal voltage is approaching a final regulated voltage, with the output current being comprised of first and second current components, with the first current component being proportional to the output voltage and the second current component being proportional to the input voltage, with the two components being combined so as to resist changes in the power dissipation in the pass transistor during startup. | 05-17-2012 |
20120155127 | METHODS AND APPARATUSES FOR COMBINED FREQUENCY COMPENSATION AND SOFT START PROCESSES - Soft start circuits for a switching power converter include an amplifier configured to operate from a common bias node and amplify a difference between a positive input and a negative input to generate an amplifier output. A soft start bias circuit supplies a soft start bias current during a soft start process for the switching power converter. An operational bias circuit supplies an operational bias current after the soft start process. In some embodiments, a capacitor is operably coupled to the amplifier output and is configured to provide a frequency compensation for the switching power converter and a charging ramp for the soft start process. In some embodiments, the soft start circuit is configured such that the soft start bias current is at least an order of magnitude smaller than the operational bias current and limits a current that the amplifier can during the soft start process. | 06-21-2012 |
20120163047 | STARTUP CIRCUIT, SWITCHING POWER SOURCE IC, AND SWITCHING POWER SOURCE APPARATUS - A startup circuit includes a MOSFET that is connected between a startup power source and an auxiliary power source made of a smoothing capacitor and passes a startup current from the startup power source to the smoothing capacitor, a JFET that has a drain terminal connected to a drain terminal of the MOSFET and a source terminal connected through a resistor to a gate terminal of the MOSFET, and a pinch-off voltage controller that controls a pinch-off voltage of the JFET to a first reference voltage at startup and to a second reference voltage, which is lower than the first reference voltage, after startup. | 06-28-2012 |
20120230069 | STARTUP CONTROL CIRCUIT WITH ACCELERATION STARTUP FUNCTION AND METHOD FOR OPERATING THE SAME - A startup control circuit with an acceleration startup function and a method for operating the same are disclosed. The startup control circuit is applied to a power supply. A power switch, which is coupled to a primary-side winding of a transformer, is switched to control the transformer, thus adjusting the output voltage of the power supply. The startup control circuit mainly includes a capacitor and a startup control apparatus. The startup control apparatus includes an enable switch unit and a power control unit. By turning on and turning off the enable switch unit of the startup control apparatus, the acceleration startup control and the stable output power of the power supply can be implemented. | 09-13-2012 |
20120236609 | APPARATUS FOR REDUCING STANDBY POWER - Disclosed is an apparatus for reducing standby power, which is capable of minimizing standby power losses by using an electric double layer capacitor (ELDC). The apparatus includes: an electric double layer capacitor for converting electrical energy supplied from the AC power source into DC power and storing the converted electrical energy; a charging circuit for charging the electrical energy in the electric double layer capacitor; a voltage conversion circuit for converting the electrical energy charged in the electrical double layer capacitor into a stable voltage; a voltage detection circuit for detecting a charged voltage of the electric double layer capacitor; and a power supply control circuit for turning on/off a power switch in response to a command from the voltage detection circuit, wherein the power supply control circuit uses the electrical energy charged in the electrical double layer capacitor to turn on/off the power switch. | 09-20-2012 |
20120250376 | SOFT STARTER FOR PHASE-SHIFTING AUTOTRANSFORMER AC-DC POWER CONVERTER - An AC-DC power converter has a phase-shifting autotransformer based rectifiers and DC capacitors. Soft start of the AC-DC power converter is achieved by designing the autotransformer to operate at a low peak flux density at a point of AC voltage step application (initial turn on). The addition of a controlled impedance segregates capacitor charging from the initial magnetizing process of the autotransformer. | 10-04-2012 |
20120257426 | AC Adapter With Automatic Built-In Power Switch - The AC adapter with automatic built-in power switch comprises of an AC power supply circuit, an AC control circuit, and a monitoring circuit. The monitoring circuit further comprises of a standby power supply, a microcontroller, a circuit for device detection, and a current monitor circuit. The AC power supply circuit is electrically connected to the alternating current source and converts the alternating current to direct current for charging the rechargeable battery of an electronic device. The AC control circuit acts as a switch to turn the AC power supply on and off. The monitor circuit detects whether an electronic device is connected to the adapter and also whether the charging process is completed. | 10-11-2012 |
20120287684 | CONVERTER - A converter may include a transformer; a first circuit arrangement coupled to a first transformer side; a second circuit arrangement coupled to a second transformer side, wherein the second circuit arrangement is configured to provide an output voltage; a first coupler configured to provide information about the output voltage to the first circuit arrangement; wherein the first circuit arrangement is configured to determine a state of the secondary side based on the received information about the output voltage, and to generate a switch control signal dependent on the determined state; a switch circuit arranged on the second side; and a second coupler configured to provide a switch control signal from the first circuit arrangement to the switch circuit; wherein the switch circuit is coupled to the first circuit arrangement to provide a first circuit arrangement control signal to the first circuit arrangement depending on the switch control signal. | 11-15-2012 |
20120287685 | CONVERTER - A converter may include a start-up circuit having a switch circuit coupled to a reference potential terminal and an input circuit coupled to an input voltage, wherein the input circuit is coupled to the start-up circuit such that in case that at least one of the input voltage is lower than a predetermined threshold and that the input voltage is substantially constant for a predefined time period, electrical charges stored in the input circuit are flowing through the switch circuit to the reference potential terminal. | 11-15-2012 |
20120294051 | High-Voltage Startup Circuit - A system including a power transistor configured to receive an alternating current (AC) line voltage and a control circuit. During a rising portion of a half cycle of the AC line voltage, the control circuit is configured to turn on the power transistor when the AC line voltage reaches a first value and turn off the power transistor when the AC line voltage reaches a second value. The second value is greater than the first value. During a falling portion of the half cycle, the control circuit is configured to turn on the power transistor when the AC line voltage reaches the second value and turn off the power transistor when the AC line voltage reaches the first value. | 11-22-2012 |
20120294052 | MONOTONIC PRE-BIAS START-UP OF A DC-DC CONVERTER - The power conversion module includes a power converter coupled to provide a DC output voltage from an input voltage source. The power converter may have primary and secondary stages, and the power converter may also provide a DC output voltage that is electrically isolated from the input voltage source. Additionally, the power conversion module also includes a voltage controller configured to measure a pre-bias value of the output voltage prior to start-up of the power converter and provide a start-up control signal, wherein the start-up control signal corresponds to an initial output voltage that is greater than the pre-bias value of the output voltage. The initial output voltage includes a start-up voltage margin above the pre-bias value and is maintained for a margin hold time. A method of operating a power conversion module is also provided. | 11-22-2012 |
20120314462 | OFFLINE POWER SUPPLY AND APPARATUS FOR CHARGING A PLUG-IN VEHICLE - An offline power supply includes a power supply circuit including a primary-side circuit for connecting to a first power source, a secondary-side circuit for connecting to a load, and a transformer connecting the primary-side circuit and the secondary-side circuit. A switch operates to selectively connect the primary-side circuit to the first power source. A second power source is charged during operation of the power supply circuit. A controller powered by the second power source has at least one input, and an output to selectively operate the switch based on the at least one input. | 12-13-2012 |
20130003428 | POWER SUPPLY SYSTEM AND ELECTRICAL DEVICE WITH SAME - An exemplary power supply system is used to provide one or more operation voltages to a plurality of loads individually. The power supply system includes a timing circuit configured to control a starting time that the corresponding loads start to receive their corresponding operation voltages. The timing circuit includes a first capacitor arranged to be charged by the corresponding DC voltage, and the starting time is determined according to a charging characteristic of the first capacitor. | 01-03-2013 |
20130016540 | POWER CONVERTER COMPRISING AN INVERTER MODULE USING NORMALLY ON FIELD-EFFECT TRANSISTORSAANM BARAUNA; Allan PierreAACI VernonAACO FRAAGP BARAUNA; Allan Pierre Vernon FR - The invention relates to a power converter comprising: | 01-17-2013 |
20130039101 | SWITCHING POWER SUPPLY APPARATUS - A switching power supply apparatus including an AC-to-DC conversion circuit, a hysteretic relay and a relay control circuit is provided. The AC-to-DC conversion circuit includes a current limit resistor, and the current limit resistor is configured to suppress an inrush current generated during the AC-to-DC conversion circuit converts an AC input voltage into a DC output voltage. The hysteretic relay is coupled with the current limit resistor in parallel. The relay control circuit is coupled to the AC-to-DC conversion circuit and the hysteretic relay, and configured to control the hysteretic relay to turn on in response to one of an over drive pulse signal and a holding modulation signal when the DC output voltage reaches to a predetermined value, so as to bypass the current limit resistor, wherein an enabling time of the over drive pulse signal is different from that of the holding modulation signal. | 02-14-2013 |
20130077362 | POWER FACTOR CORRECTION (PFC) CIRCUIT CONFIGURED TO CONTROL HIGH PULSE LOAD CURRENT AND INRUSH CURRENT - A power circuit for protecting against high pulse load current and inrush current is disclosed. The power circuit comprises a buck-boost module and a PFC controller operatively coupled with the buck-boost module. The PFC controller is configured to receive an input voltage feedback, an output voltage feedback, and a current feedback, and is configured to utilize one of an Integral Gain Compensation (IGC) and an Integral Value Compensation (IVC) to control the high pulse load current and inrush current in the power circuit. | 03-28-2013 |
20130100718 | POWER STARTING CIRCUIT - A power starting circuit used in a DC power supply circuit has a double-pole, double-throw switch electrically connected to a positive pole of a DC power supply and controls a conducting state of the circuit. A first capacitor provides a voltage signal for a first switch circuit and controls the conducting state of the first switch circuit in a continuous charging and discharging process. The first switch circuit controls the conducting state of the DC power supply circuit. A maintaining signal input end provides a maintaining signal for the first capacitor. The power starting circuit can achieve an over discharge protection function for the control circuit. Moreover, when the switch is turned on, it can automatically switch the circuit off so as to save power if the electrical product does not need to continue to work. | 04-25-2013 |
20130114313 | SWITCHING MODE POWER SUPPLY, APPARATUS AND METHOD OF SUPPLYING POWER BY USING THE SAME, AND IMAGE FORMING APPARATUS THEREFOR - A switching mode power supply (SMPS) usable with an image forming apparatus receives an alternating current (AC) power from an external electric power supply source and outputs a direct current (DC) power. When a supply state of an electric power to the image forming apparatus is turned off, electric charges charged in a capacitor of the SMPS are discharged. | 05-09-2013 |
20130188405 | CAPACITOR DISCHARGING CIRCUIT AND POWER CONVERTER - A capacitor discharging circuit and a power converter having the capacitor discharging circuit are disclosed. The capacitor discharging circuit comprises a conversion module connected with the two terminals of the capacitor, an AC power-off detecting unit used to detect on-off state of AC power, and a control unit. The conversion module comprises an energy consumption unit. When AC power is disconnected, the AC power-off signal generated by the AC power-off detecting unit intervenes the control unit to control the energy consumption unit to consume the energy stored in the capacitor. | 07-25-2013 |
20130235629 | STARTER OF GRID-CONNECTED INVERTER AND CONTROL METHOD THEREOF - A starter of the grid-connected inverter and a control method thereof are disclosed. The starter comprises a controller, and a first switch and a first resistor connected in parallel. The controller includes an input end, and first and second output ends. The input end inspects the DC voltage signal from the inverter. When the DC voltage exceeds a predetermined voltage threshold, the first output end sends a first control signal to turn on the first switch, and the second output end sends a second control signal to make the grid-connected inverter enter into a chopping mode. There is a delay period between the send time of the first control signal and that of the second control signal. | 09-12-2013 |
20130242625 | Adaptive Bipolar Junction Transistor Gain Detection - A power converter that controls a collector current of a bipolar junction transistor (BJT) by controlling the base current to the BJT after having determined the gain of the BJT. A gain detection block determines a gain of the BJT during a first mode. A current calculation block generates a current setting for the base current based on the gain of the BJT determined by the gain detection block during a second mode distinct from the first mode. In some embodiments, the power converter may be included in a LED lamp system. | 09-19-2013 |
20130250633 | POWER SWITCH MODULE, VOLTAGE GENERATING CIRCUIT AND POWER CONTROL METHOD FOR ELECTRONIC DEVICE - A power switch module for an electronic device includes a flip-flop circuit, a first current path for coupling a voltage source to the flip-flop circuit, and a second current path for coupling the voltage source to the flip-flop circuit. In response to a user power-on event, an output of the flip-flop circuit is at a first logic state for normally powering on the electronic device. In response to a user power-off event, the output of the flip-flop circuit is at a second logic state for normally powering off the electronic device. When the voltage source is suddenly interrupted, the output of the flip-flop circuit is kept at the first logic state but the electronic device is abnormally powered off. After the voltage source is resumed, the output of the flip-flop circuit kept at the first logic state reboots the abnormally powered-off electronic device. | 09-26-2013 |
20130265807 | CLOCK-BASED SOFT-START CIRCUIT AND POWER MANAGEMENT INTEGRATED CIRCUIT DEVICE - In a clock-based soft-start circuit configured to generate a soft-start reference voltage that restrains an inrush current at an initialization of power supplied to a DC-DC converter, the clock-based soft-start circuit comprises a time setting unit configured to set a soft-start time period in response to a clock signal. A ramp circuit is configured to generate a soft-start reference voltage which is ramped upward or downward between a base level and a reference voltage level during the soft start time period set by the time setting unit. In this manner, the clock-based soft-start circuit is applicable for all DC-DC converters and the soft-start in a linear slope is possible. | 10-10-2013 |
20130279218 | SWITCH CIRCUIT AND ELECTRONIC DEVICE - An electronic device includes a power supply, a load, and a switch circuit controlling the power supply. The switch circuit includes a control unit and a key switch capable of establishing an electrical connection between the power supply and the control unit in response to an operation by a user. When the key switch establishes the electrical connection, the control unit receives a supply voltage from the power supply and is charged-up by the supply voltage to generate a first control signal, the first control signal enables the power supply to power the load. | 10-24-2013 |
20130286694 | POWER ADAPTER AND ELECTRICAL CONNECTOR THEREFOR - A power adapter and an electrical connector for the power adapter operate to provide power to an electronic device such as a laptop computer. The power adapter includes a switch and a circuit for detecting whether or not the electrical connector is connected to the electronic device. If the adapter is not connected to an electronic device, the switch is opened so that no power is drawn from an AC supply. The electrical connector includes first and second conductors that are electrically connected to the detection circuit. The detection circuit detects a change in potential when the connector is plugged into an electronic device. | 10-31-2013 |
20130286695 | CONTROLLER FOR AN INVERTER CIRCUIT, INVERTER, AND METHOD FOR OPERATING AN INVERTER - Damage to an inverter due to an excessively high start-up current, when using space vector control without a voltage sensor in conjunction with small connection inductances, can be prevented with a method for controlling the inverter, and with a corresponding controller, wherein the controller is configured to transmit in a start-up phase of an inverter circuit a control signal to a control input of the inverter circuit, wherein the control signal simultaneously switches three first semiconductor switches, which are connected to a first DC voltage terminal of the inverter circuit, temporarily into a conducting state. | 10-31-2013 |
20130294120 | SWITCHING CONVERTER - A switching converter in which deterioration and breakage can be suppressed is provided. A switching converter whose area can be reduced is provided. The switching converter includes a switch connected to a power supply portion; a transformer connected to the power supply portion; a first rectifying and smoothing circuit and a second rectifying and smoothing circuit each connected to at least the transformer; and a switching control circuit which is connected to the first rectifying and smoothing circuit and the second rectifying and smoothing circuit and which controls operation of the switch. The switching control circuit includes a control circuit controlling on/off of the switch and operation of a starter circuit; and the starter circuit controlling startup of the control circuit. The starter circuit includes a transistor and a resistor each including a wide-gap semiconductor. | 11-07-2013 |
20140043872 | CONTROL DEVICE FOR A SWITCHING DEVICE WITH SEPARATE START-UP AND HOLDING COILS - A control device for a switching device with separate start-up and holding coils includes control electronics to control the current supply to the start-up and holding coils and a direct voltage supply unit for the holding coil and the control electronics with the same reference potential for the holding coil and the control electronics. | 02-13-2014 |
20140049994 | DEVICE FOR SYNCHRONOUS DC-DC CONVERSION AND SYNCHRONOUS DC-DC CONVERTER - A DC-DC converter transforms a DC input voltage to generate a DC output voltage by complementary switching control of a main switching transistor and a synchronous rectifying transistor. The DC-DC converter includes a soft-start circuit configured to generate a soft-start voltage rising from an initial voltage at start-up of the DC-DC converter; and a control circuit configured to control switching of the main switching transistor and the synchronous rectifying transistor based on the soft-start voltage to perform soft start of the DC-DC converter. The control circuit brings both of the main switching transistor and the synchronous rectifying transistor to an off state while the soft-start voltage is lower than the DC output voltage. | 02-20-2014 |
20140056040 | POWER SUPPLY APPARATUS FOR AN ELECTRICAL APPLIANCE - A power supply apparatus includes a power supply circuit and a power-on circuit. The power-on circuit detects a remotely transmitted control signal and causes a transition of the power supply circuit to a turned on state. The power-on circuit includes a transducer configured to provide a power-on signal in response to the remote control signal. The transducer triggers transition to the turned on state through a switch driven by the power-on signal output from the transducer and arranged to supply a power supply circuit enable signal. A DC blocking capacitor is connected between an output of the transducer and a control terminal of the switch. | 02-27-2014 |
20140063875 | START-UP CIRCUIT AND METHOD FOR AC-DC CONVERTERS - An AC-DC power converter includes a rectifying unit for generating a rectified voltage, an output stage for converting the rectified voltage into a DC voltage for a load, a controller for controlling the output stage, and a start-up circuit. The start-up circuit includes a first power section coupled to the rectifying unit and configured to generate a first voltage from the rectified voltage and to output the first voltage to the controller to enable the controller before the output stage starts outputting power. The first power section includes a depletion mode transistor having a first terminal configured to receive the rectified voltage and a second terminal configured to output the first voltage. | 03-06-2014 |
20140085946 | POWER SYSTEM AND STARTING METHOD THEREOF - A power system and a starting method thereof includes a power output circuit, a loop circuit, a soft start circuit, and a constant-current source that supplies power to the soft start circuit. The loop circuit includes a loop circuit capacitor. The power system further includes a precharge circuit that charges the loop circuit capacitor, and the precharge circuit charges the loop circuit capacitor when the soft start circuit charges the power output circuit. | 03-27-2014 |
20140126254 | START-UP CIRCUIT AND METHOD WITH SOFT-START SCHEME FOR AC-DC CONVERTERS - An AC-DC power converter includes a rectifying unit, an output stage, a controller and a soft-start circuit. The rectifying unit is configured to rectify an AC voltage to a rectified voltage. The output stage is coupled to the rectifying unit and configured to convert the rectified voltage into a DC voltage for a load. The controller is coupled to the output stage and configured to control the output stage. The soft-start circuit is coupled to the rectifying unit to receive the rectified voltage. The soft-start circuit is configured to detect whether the rectified voltage is at or below a predetermined level, and to enable the controller if the rectified voltage is detected to be at or below the predetermined level. | 05-08-2014 |
20140146586 | MULTILEVEL CONVERTER AND METHOD OF STARTING UP A MULTILEVEL CONVERTER - A multilevel converter for converting between an AC voltage and a DC voltage and a method of starting up such multilevel converter are provided. The multilevel converter has an AC terminal and a DC terminal for connecting the multilevel converter to either an AC power source or a DC power source, respectively, which supplies the voltage to be converted. The multilevel converter further comprises at least one converter leg, the DC terminal comprising a first and a second DC terminal, the converter leg comprising plural converter cells connected in series between the first and second DC terminals. The AC terminal of the multilevel converter is electrically coupled to an electrical link between two of said converter cells of said converter leg. | 05-29-2014 |
20140177296 | POWER CONVERSION APPARATUS - A power conversion apparatus is provided. The power conversion apparatus includes an AC to DC adapter, an input port, a power conversion control unit, and a restart circuit. The AC to DC adapter converts an AC input voltage into a DC output voltage according to an external signal of an electronic apparatus and provides the DC output voltage to the electronic apparatus. The input port receives the AC input voltage through an AC input terminal. If the power conversion apparatus does not output the DC output voltage to the electronic apparatus, the power conversion control unit turns off the power conversion apparatus. If the restart circuit detects that an insertion action occurs on the input port, the restart circuit transmits a trigger signal to turn on the power conversion control unit in an off mode. | 06-26-2014 |
20140185340 | SWITCHING POWER SUPPLY - In some aspects of the invention, a switching power supply can include a control circuit that conducts feedback control of a pulse width of a driving signal for switching the switching element according to an output voltage and settle the output voltage to a specified voltage level; a frequency reducing circuit that is disposed in the control circuit and reduces a frequency of the driving signal for switching the switching element upon detection of an overload state and limits an output current; and an initial state setting circuit that sets the control circuit to an overload detecting state for a predetermined period of time in a startup period of the control circuit. The initial state setting circuit can pull down a control voltage for a soft start signal for soft starting to the ground potential to inhibit generation of the driving signal and pulls up a feedback voltage signal. | 07-03-2014 |
20140211524 | POWER CONVERTER AND PRE-CHARGING CIRCUIT OF SAME - A power converter configured to control an electrical load including a supply DC bus, a bus capacitor, a pre-charging circuit of the bus capacitor provided with a limiting resistor, a switched-mode power supply, and a starter assembly of the switched-mode power supply. The power converter includes a selection mechanism configured to connect the supply DC bus either, in a first state, to the starter assembly of the switched-mode power supply or, in a second state, to the bus capacitor to short circuit the limiting resistor. | 07-31-2014 |
20140218981 | POWER SUPPLY SYSTEM - A power supply system includes: a switching power supply; a control device; an auxiliary power supply circuit, which is connected in parallel with the switching power supply with respect to an AC power supply, which includes an electricity storage unit for storing electricity by charging current fed from the alternating current power supply, and which feeds power to the control device; and a first switching unit for switching a connection state of the auxiliary power supply circuit to the alternating current power supply. The control device is configured to, upon starting up the switching power supply, switch the first switching unit into a state where the auxiliary power supply circuit is separated from the alternating current power supply. | 08-07-2014 |
20140233283 | STARTUP CIRCUIT AND METHOD FOR AC-DC CONVERTERS - An AC-DC power converter includes a rectifying unit for generating a rectified voltage, an output stage for converting the rectified voltage into a DC voltage for a load, a controller for controlling the output stage, and a start-up circuit. The start-up circuit includes a start-up voltage generator coupled to the rectifying unit and configured to generate a start-up voltage from the rectified voltage and to output the start-up voltage to the controller to provide power for operation of the controller before the output stage starts outputting power. The start-up voltage generator includes a first depletion mode transistor having a first terminal configured to receive the rectified voltage, a second terminal configured to output at least partially the start-up voltage, and a gate terminal which is grounded. | 08-21-2014 |
20140241017 | INPUT CIRCUIT AND POWER SUPPLY CIRCUIT - An input circuit connected to a semiconductor circuit is configured to receive a voltage indicating an on/off operation state of a power supply and to output a voltage that is lower than a breakdown voltage of the semiconductor circuit. The input circuit includes a first nMOS transistor and a resistor element. The first nMOS transistor has a drain receiving an outside voltage, a gate receiving a bias voltage higher than a power supply voltage inputted to a semiconductor circuit, and a source connected to the semiconductor circuit. The first nMOS transistor has a breakdown voltage higher than the power supply voltage inputted to the semiconductor circuit. One end of the resistor element connects with the source of the first nMOS transistor, while the other end connects with a reference potential of the semiconductor circuit. | 08-28-2014 |
20140268935 | AC/DC CONVERTING CIRCUIT AND STARTING METHOD THEREOF - An AC/DC converting circuit and a starting method thereof are provided. An AC detection or a rectified AC voltage detection is disabled when the AC voltage or the rectified AC voltage not up to a start-up voltage is detected, so as to shorten a recovery time of a voltage of a power supply terminal of an AC/DC power conversion controller, and further shorten a starting time of the AC/DC converting circuit. | 09-18-2014 |
20140268936 | ULTRA LOW-VOLTAGE CIRCUIT AND METHOD FOR NANOPOWER BOOST REGULATOR - At least one embodiment provides a method for a nanopower boost regulator to startup from an ultra-low-voltage (such as 0.3V˜0.5V) for energy harvesting applications. The method does not necessarily require a special process or any external components such as mechanical switches. The startup circuit can include an asynchronous boost circuit to charge up an output with stacked power NMOS transistors, a ring oscillator, and/or a charge pump, along with accompanying circuitry. | 09-18-2014 |
20140268937 | SYSTEM AND METHOD FOR SUPPLYING POWER AT STARTUP - A system including a switch and a control circuit. The switch is configured to receive a first voltage. The control circuit is configured to, during a rising portion of a half cycle of the first voltage, (i) turn on the switch in response to the first voltage reaching a first value, and (ii) turn off the switch in response to the first voltage reaching a second value, where the second value is greater than the first value. The control circuit is further configured to, during a falling portion of the half cycle of the first voltage, (i) turn on the switch in response to the first voltage reaching the second value, and (ii) turn off the switch in response to the first voltage reaching the first value. | 09-18-2014 |
20140293665 | Damage Limitation - A damage limitation approach comprising determining that a voltage produced by a rectifier circuit is indicative of a fault and consequently controlling a switch operable to bypass a resistive element of a circuit via which the rectifier circuit is supplied. | 10-02-2014 |
20140301120 | Systems and Methods for Use in Recovering a Converter After Grid Fault Event - Systems, power modules ( | 10-09-2014 |
20140321175 | SYSTEM AND METHOD FOR PROTECTION DURING INVERTER SHUTDOWN IN DISTRIBUTED POWER INSTALLATIONS - A protection method in a distributed power system including of DC power sources and multiple power modules which include inputs coupled to the DC power sources. The power modules include outputs coupled in series with one or more other power modules to form a serial string. An inverter is coupled to the serial string. The inverter converts power input from the string and produces output power. When the inverter stops production of the output power, each of the power modules is shut down and thereby the power input to the inverter is ceased. | 10-30-2014 |
20140334200 | START-UP CIRCUIT - Aspects of the disclosure provide a circuit. The circuit includes a depletion mode transistor coupled to a power supply and a current path coupled with the depletion mode transistor in series to provide a current to charge a capacitor. The current path has a first resistance during a first stage, such as when the circuit initially receives power, and has a second resistance during a second stage when the capacitor is charged to have a predetermined voltage level. | 11-13-2014 |
20140376285 | Auxiliary Power Supplies - The invention relates to auxiliary power supplies. | 12-25-2014 |
20150023072 | START-UP CIRCUIT AND METHOD FOR AC-DC CONVERTERS - For starting-up a power converter, an AC rectified voltage is generated upon power-up of the power converter. A depletion mode transistor generates a first voltage from the rectified voltage. The first voltage is inputted to a controller of the power converter to provide power for operation of the controller before an output stage of the power converter starts outputting power. A gate biasing voltage is generated from the first voltage and supplied to a gate terminal of the depletion mode transistor to bias the gate terminal of the depletion mode transistor. | 01-22-2015 |
20150029767 | Power Controllers with Ultra-High-Voltage Startup - A power controller in a multi-chip module is disclosed. The power controller comprises a power controller die, an ultra-high voltage startup die, and a multi-chip module. The power controller die is operable to control a power switch when powered by an operation power source. The operation power source has a maximum voltage limit of tens volt. The ultra-high voltage startup die comprises an ultra-high voltage pad tolerable to receiving an input line voltage higher than one hundred volt. During a startup procedure the ultra-high voltage startup die charges the operation power source, and during a normal operation the ultra-high voltage startup die substantially performs an open-circuit. The multi-chip module packages both the power controller die and the ultra-high voltage startup die. | 01-29-2015 |
20150043255 | HIGH VOLTAGE GENERATOR - A high voltage generator includes a voltage converting device configured to increase a level of an input voltage and output an output voltage having a level higher than the level of the input voltage. The high voltage generator also includes a precharge controller configured to gradually increase the level of the input voltage up to a level of an external voltage based on a reference voltage and the output voltage. | 02-12-2015 |
20150131343 | RESISTORLESS PRECHARGING - A boost PFC converter includes a rectifier, a converter and an output stage comprising an output capacitor where the DC output voltage is provided across the output capacitor. The rectifier includes four rectifying elements connected in a full bridge configuration where the upper two of these four rectifying elements are thyristors and where the lower two are diodes. In that the thyristors are controlled such as to be open for only a part of each half period of the input voltage, the amount of current per half period that is passed to the output capacitor is controllable and can be made very small. Accordingly, the charge current for precharging the output capacitor can be controllably limited such that a bulky precharge resistor is not required anymore to avoid high inrush currents. | 05-14-2015 |
20150295490 | INVERTER DEVICE - An inverter device includes an inverter circuit, which has switching elements in a bridge connection, a capacitor, which is connected in parallel to the input side of the inverter circuit, a control device, which controls the inverter circuit, a temperature detector, which detects the temperature of the capacitor, a degree-of-deterioration determiner, which determines the degree of deterioration of the capacitor, and a warm-up controller. When the temperature of the capacitor detected by the temperature detector is lower than a prescribed temperature, the warm-up controller controls the switching elements of the inverter circuit to supply a direct current set based on the degree of deterioration and the temperature of the capacitor to the coil of an electric motor connected to the output side of the inverter circuit. | 10-15-2015 |
20150311280 | A HIGH VOLTAGE DEVICE WITH COMPOSITE STRUCTURE AND A STARTING CIRCUIT - A high voltage device with composite structure comprises a high voltage power MOS transistor HVNMOS and a JFET. The high voltage power MOS transistor HVNMOS comprises a drain, a source, a gate and a substrate, and a P-type well region Pwell as a conducting channel which is arranged between the source and the drain. The JFET comprises the drain, the source, the gate and the substrate, and an N-type well region Nwell as a conducting channel which is arranged between the source and the drain. The high voltage power MOS transistor HVNMOS and the JFET share the same drain, and the drain is processed by using N-type double diffusion process. The embodiment of the present invention further presents a starting circuit using the high voltage device with composite structure. | 10-29-2015 |
20150365012 | CONVERTER ARRANGEMENT - A converter arrangement can include a first rectifier having an AC input and a DC output with two DC output poles, a capacitance (C) connected between the DC output poles of the first rectifier, a second rectifier having an AC input with two AC input poles and a DC output with two DC output poles, wherein the DC output of the second rectifier is connected between the DC output poles of the first rectifier. A magnetic amplifier includes at least one control winding (L | 12-17-2015 |
20150365016 | APPARATUS FOR DELAY ANGLE COMPENSATION OF FLYING START FUNCTION - An apparatus for delay angle compensation for flying start function in a medium-voltage inverter is disclosed. The apparatus generates generate a phase angle (θ) by converting a three-phase voltage of an inverter output terminal to dq-axis voltages (Vd, Vq), and calculate a compensation phase angle by a predetermined delay time. In addition, the apparatus generates an initial angle for the flying start by aggregating the compensation phase angle with the phase angle (θ). The apparatus may drive a high-voltage motor more stably, because an error between a command voltage phase angle and an actual output voltage phase angle may be reduced, when electric power of the medium voltage inverter is restored after a trip or an instantaneous blackout occurs. | 12-17-2015 |
20160065053 | METHOD FOR STARTUP CONTROL OF PHOTOVOLTAIC INVERTER, SYSTEM THEREOF, AND PHOTOVOLTAIC POWER GENERATION SYSTEM - A method for start control of photovoltaic inverter, a system thereof, and a photovoltaic power generation system are provided. A fan of the photovoltaic inverter is controlled to operate in a case that input voltage of the photovoltaic inverter is greater than a start threshold, and the fan operation is used as a load. Input voltage drop before and after the fan operates is obtained, and in a case that the input voltage drop is less than or equal to a voltage determination threshold, the photovoltaic inverter is controlled to start a grid connection. The voltage determination threshold is changed based on a power determination threshold of the photovoltaic inverter. | 03-03-2016 |
20160118874 | Auxiliary Power Supplies - The invention relates to methods for supplying current to an auxiliary power supply, where the auxiliary supply is connected in parallel to a first switch of a switching regulator and the parallel connection of the auxiliary supply comprises a diode and a second switch. | 04-28-2016 |
20180026522 | STARTING CURRENT LIMITATION | 01-25-2018 |
20190149037 | System and Method for Protection During Inverter Shutdown in Distributed Power Installations | 05-16-2019 |