Patent application number | Description | Published |
20080211465 | Soft-stop circuit and method for a voltage regulator - A soft-stop circuit and method are provided for a voltage regulator which converts a battery voltage to an output voltage according to a feedback voltage derived from the output voltage and a reference voltage, to control the voltage regulator to enter a soft-stop state when the battery voltage is lower than a threshold level, and in which state, and the output voltage is controlled to decrease so as for the battery voltage to have a slower decreasing speed and in turn a longer battery lifetime. | 09-04-2008 |
20080246455 | Adaptive zero current sense apparatus and method for a switching regulator - A switching regulator includes a low-side switch having a body diode. During the low-side switch is on, a zero-current sense circuit monitors the inductor current of the switching regulator and triggers a signal to turn off the low-side switch when the inductor current falls down to a zero-current threshold, to prevent reverse inductor current from the output terminal of the switching regulator. A body-diode turn-on time controller monitors the turn-on time of the body diode and adjusts the zero-current threshold according thereto, and the turn-on time of the body diode can be reduced to an optimal interval subsequently. The self-adjustable zero-current threshold is adaptive according to the application conditions, such as the inductor size, input voltage and output voltage of the switching regulator. | 10-09-2008 |
20090096434 | NMOSFET-base linear charger - In an NMOSFET-base linear charger, a pair of common gate charging NMOSFET and sensing NMOSFET have their sources coupled together or virtually shorted to each other, so that these two NMOSFETs have a same gate-source voltage and thereby the sensing NMOSFET reflects the drain-source current of the charging NMOSFET on its drain-source current. From the drain-source current of the sensing NMOSFET, a current sensing signal is generated to control the gate voltage of the charging NMOSFET. By implementing the current source with NMOSFETs, the linear charger has smaller die area and less power loss. | 04-16-2009 |
20090237035 | Circuit and method for detecting absent battery condition in a linear charger - A circuit and method for detecting absent battery condition in a linear charger apply a detecting signal onto an output terminal of the charger and monitor the output terminal to receive a detected signal. The capacitance at the output terminal is significantly different between the presence and absence of a battery connected to the output terminal, and it is thus available to determine from the detected signal, if no battery is connected to the output terminal. | 09-24-2009 |
20090261654 | Power path control circuit - The present invention provides a power path control circuit comprising: an input node for receiving an external power; a first power transistor electrically connected between the input node and a first node, for controlling power supplied from the input node to the first node; a second power transistor electrically connected between the first node and a battery, for controlling power supplied from the battery to the first node; an error amplifier including an output electrically connected with a gate of the second power transistor, a first input terminal electrically connected with the first node, and a second input terminal electrically connected with the battery, wherein a voltage difference is allocated between the two input terminals. | 10-22-2009 |
20090315527 | Output current detection of a voltage regulator - For output current detection of a voltage regulator, the currents in a high-side transistor and a low-side transistor of the voltage regulator are sensed and summarized to a summed current to flow through a setting resistor. The voltage variation on the setting resistor is monitored to provide a feedback signal for feedback control in the voltage regulator. This detection scheme removes the current sensing resistor from the charging current path of the voltage regulator to prevent efficiency loss on it, and is much less sensitive to noise interference because greater voltage variation is available by using a greater setting resistor. | 12-24-2009 |
20100052629 | Adaptive zero current sense apparatus and method for a switching regulator - A switching regulator includes a low-side switch having a body diode. During the low-side switch is on, a zero-current sense circuit monitors the inductor current of the switching regulator and triggers a signal to turn off the low-side switch when the inductor current falls down to a zero-current threshold, to prevent reverse inductor current from the output terminal of the switching regulator. A body-diode turn-on time controller monitors the turn-on time of the body diode and adjusts the zero-current threshold according thereto, and the turn-on time of the body diode can be reduced to an optimal interval subsequently. The self-adjustable zero-current threshold is adaptive according to the application conditions, such as the inductor size, input voltage and output voltage of the switching regulator. | 03-04-2010 |
20100060233 | Charger with USB detection - A charger for a battery system detects the voltage level of a data pin of the battery system to determine whether an external power source plugged in to the battery system is a USB voltage source. When the external power source is a USB voltage source, the charger will provide power for a USB transceiver of the battery system or enable it. | 03-11-2010 |
20100072915 | Boost driver circuit with fast discharging function - The present invention discloses a boost driver circuit which converts an input voltage to an output voltage and supplies it to a load, the boost driver circuit comprising: a power transistor electrically connected with a node between the input voltage and the output voltage; a pulse width modulation driver circuit for controlling the operation of the power transistor; an output node electrically connected with the output voltage; a feedback node electrically connected with the load; a low voltage transistor electrically connected with the feedback node; and a clamp and fast discharge circuit electrically connected with the feedback node for discharging the feedback node when the voltage at the feedback node is higher than a predetermined voltage. | 03-25-2010 |
20100231047 | POWER SAFETY SYSTEM - A power safety system includes a first MOS, a second MOS, a switch and a body controller. The first MOS is connected between a power input and a power output. The second MOSFET is connected between the power output and a charging output. The switch has an end connected to the body of the first MOS, and the opposite end switched between the source and the drain of the first MOS. A body controller controls the switch according to the voltage at the power input and the voltage at the power output, to connect the body of the first MOS to the source or the drain of the first MOS. By switching the switch, the first MOS will have a parasitic diode effective to prevent a reverse current from the power output to the power input. | 09-16-2010 |
20110006728 | HYBRID BATTERY CHARGER AND CONTROL CIRCUIT AND METHOD THEREOF - A hybrid battery charger includes a control circuit and a power stage. The control circuit includes an error amplifier to generate a first error signal and a second error signal according to an output voltage and an output current of the hybrid battery charger, a linear controller to generate a first control signal according to the first error signal, a PWM controller to generate a second control signal and a third control signal according to the second error signal, and according to a mode signal, a multiplexer to select the first control signal for the power stage to operate the hybrid battery charger in a linear mode, or the second and third control signals for the power stage to operate the hybrid battery charger in a switching mode. | 01-13-2011 |
20110012565 | CHARGING CIRCUIT WITH APPLICATION SYSTEM THEREOF - A charging circuit with an application system thereof provides an error amplifier to control a transistor switch for controlling the charging power source to charges the battery. When the voltage difference between the power source and load terminals of the transistor switch drops along with the transistor switch being turned on, the output voltage of the error amplifier changes as well to increase the turning-on resistance of the transistor switch such that the voltage difference between the power source and load terminals is capable of maintaining at a value above a certain reference level for avoiding the unstable state resulting from the charging circuit being turned on and off frequently. | 01-20-2011 |
20110043162 | CHARGER AND PORTABLE DEVICE HAVING THE SAME - A charger for a portable device includes a USB detector connected to a data pin to detect the effective resistance on the data pin before a USB transceiver is enabled, to identify USB or adapter plug in and control a charging current for a battery accordingly. | 02-24-2011 |
20110080142 | Charger Circuit - A charger circuit comprising: a charging path coupled between an input voltage and a battery; a power switch on the charging path; a switch control circuit controlling the power switch; a timer counting a charging period; and a low current control circuit issuing a signal to the switch control circuit to control the power switch such that a charging current is maintained to be a predetermined low current when the timer counts to a predetermined maximum charging period. | 04-07-2011 |
20110095624 | Single Wire Transmission Interface And Method For the Same - The present invention discloses a single wire transmission interface comprising: a signal detection circuit detecting level switchings of a transmission signal from a single wire, and generating an enable signal and a decoded signal corresponding to the transmission signal, the level switchings including first switchings from a first level to a second level and second switchings from the second level to the first level, wherein the enable signal starts according to one first switching of the transmission signal, and stops when no first switching occur in a predetermined period after one second switching of the transmission signal, and wherein rising edges (or falling edges) of the decoded signal correspond to the first switchings of the transmission signal; a counter, under enablement by the enable signal, counting a number of the rising edges (or the rising edges) of the decoded signal or the first switchings of the transmission signal, and generating a count; a single short pulse generator generating a short pulse according to the start of the enable signal to reset the decoded signal. | 04-28-2011 |
20120038338 | OUTPUT CURRENT DETECTION OF A VOLTAGE REGULATOR - For output current detection of a voltage regulator, the currents in a high-side transistor and a low-side transistor of the voltage regulator are sensed and summarized to a summed current to flow through a setting resistor. The voltage variation on the setting resistor is monitored to provide a feedback signal for feedback control in the voltage regulator. This detection scheme removes the current sensing resistor from the charging current path of the voltage regulator to prevent efficiency loss on it, and is much less sensitive to noise interference because greater voltage variation is available by using a greater setting resistor. | 02-16-2012 |
20120217936 | POWER MANAGEMENT CIRCUIT - The present invention discloses a power management circuit, including: a first voltage regulator, which converts an input voltage to an output voltage; a second voltage regulator coupled between the output voltage and a battery; and a voltage difference control circuit, which receives the output voltage and a voltage of the battery, and outputs a voltage difference control signal to control the first voltage regulator. The voltage difference control circuit includes: a battery reference voltage determination circuit, which generates a battery reference voltage related to the battery voltage, and an error amplifier, which receives the output voltage and the battery reference voltage and generates the voltage difference control signal. | 08-30-2012 |
20120319662 | Switching Regulator and Control Circuit and Method Therefor - The present invention discloses a switching regulator, a control circuit and a control method therefor. The switching regulator comprises an upper gate switch, a lower gate switch, and an inductor connected to a switching node. When a current passing through the upper gate switch or the inductor is lower than a threshold, the lower gate switch is kept OFF until a next cycle, and during the cycle wherein the lower gate switch is OFF, the upper gate switch is turned ON for a period of time. | 12-20-2012 |
20130002195 | CHARGER AND PORTABLE DEVICE HAVING THE SAME - A charger for a portable device includes a USB detector connected to a data pin to detect the effective resistance on the data pin before a USB transceiver is enabled, to identify USB or adapter plug in and control a charging current for a battery accordingly. | 01-03-2013 |
20130002196 | CHARGER AND PORTABLE DEVICE HAVING THE SAME - A charger for a portable device includes a USB detector connected to a data pin to detect the effective resistance on the data pin before a USB transceiver is enabled, to identify USB or adapter plug in and control a charging current for a battery accordingly. | 01-03-2013 |
20130015822 | Multi-Purpose Power Management Apparatus, Power Path Control Circuit and Control Method ThereforAANM Kung; Nien-HuiAACI Hsinchu CityAACO TWAAGP Kung; Nien-Hui Hsinchu City TW - The present invention discloses a multi-purpose power management apparatus, a power path control circuit, and a control method therefor. The multi-purpose power management apparatus controls power conversion between an input power and an output power and charging operation from the output power to a battery. The multi-purpose power management apparatus includes: a switch circuit including at least one power transistor; a switch control circuit generating a PWM signal to control the power transistor, for controlling the power conversion between the input power and the output power; a charging management circuit for controlling the charging operation from the output power to the battery; and a path selection circuit for determining whether the charging operation is controlled by the charging management circuit. | 01-17-2013 |
20130119957 | Bi-directional Switching Regulator and Control Circuit Thereof - The present invention discloses a bi-directional switching regulator and its control circuit, wherein the bi-directional switching regulator converts an input voltage to an output voltage in a power supply mode, and it includes: a power stage including an upper gate switch, a lower gate switch and an inductor coupled to a common switching node, wherein the inductor is coupled to the input voltage; a load switch coupled between the output voltage and the upper gate switch; and a driver circuit controlling the load switch to adjust an output current flowing through the load switch according to current information at an input terminal of the input voltage. | 05-16-2013 |
20130181522 | Power Management Control Circuit - A power management control circuit controls a first power transistor to convert a input voltage to an output voltage and controls a second power transistor to charge a battery from the output voltage. The first power transistor is coupled between the input voltage and the output voltage, and the second power transistor is coupled between the output voltage and the battery. The power management control circuit includes: a detection transistor detecting a current through the second power transistor and generating a charging reference voltage; an amplifier comparing the output voltage with the voltage of the battery to generate an amplified signal for controlling the charging reference voltage; a comparator comparing a reference voltage with the charging reference voltage to generate an EOC (End of Charge) signal for determining whether to stop charging the battery; and an offset voltage compensation device compensating an input offset voltage of the amplifier. | 07-18-2013 |
20130181683 | Battery Charging Circuit and Reference Signal Generator - The present invention discloses a battery charging circuit adjusting a charging voltage or a charging current according to a battery temperature, which includes: a power stage circuit including at least one power transistor switch and converting input power to charging power by operating the power transistor switch within a temperature range, wherein the charging power includes the charging voltage and the charging current; a reference signal generator obtaining signals representing the battery temperature and generating a reference signal accordingly; and a control circuit generating a switch signal according to the reference signal for operating the power transistor of the power stage circuit, wherein the charging voltage or the charging current is gradually increased as the battery temperature increases in a lower range within the temperature range or gradually decreased as the battery temperature increases in a higher range within the temperature range. | 07-18-2013 |
20130241296 | SWITCHING VOLTAGE REGULATOR WITH MULTIPLE POWER INPUT TERMINALS AND RELATED POWER CONVERTER - A switching voltage regulator for a power converter is disclosed. The power converter includes a power source selector, a regulator controller, and an inductor. The switching voltage regulator includes: a first power input terminal; a second power input terminal; a first switch having a first terminal coupled with the first power input terminal; a second switch having a first terminal coupled with the second power input terminal; a third switch having a first terminal coupled with a second terminal of the first switch and a second terminal of the second switch; and a fourth switch having a first terminal, coupled with a second terminal of the third switch, for coupling with the inductor. Control terminals of the first switch and the second switch are utilized for coupling with the power source selector. Control terminals of the third switch and the fourth switch are utilized for coupling with the regulator controller. | 09-19-2013 |
20130328540 | BUCK SWITCHING REGULATOR AND CONTROL CIRCUIT THEREOF - The present invention discloses a buck switching regulator and a control circuit thereof, wherein the buck switching regulator converts an input voltage to an output voltage. The buck switching regulator includes: a power stage including an upper-gate switch, a lower-gate switch and an inductor, which are coupled to a switching node, wherein the upper-gate switch is electrically connected to the input voltage; a transistor electrically connected between the inductor and the output voltage; and a driver circuit, which controls the upper-gate switch and the lower-gate switch at least according to a current flowing through the transistor. | 12-12-2013 |
20130335006 | CHARGE CONTROL CIRCUIT - A charge control circuit supplies power from an external power source to a first common node and charges a second common node. A regulator circuit is coupled between the external power source and the first common node, and a transistor is coupled between the first common node and the second common node. A current sensing and control device senses the current from the first common node to the second common node and generates a first control signal. A first voltage sensing and control device senses a voltage at the first common node, and generates a conduction control signal to control the transistor. A second voltage sensing and control device senses a voltage at the second common node, and generates a second control signal. The regulator circuit provides system power to the first common node according to the first control signal and the second control signal. | 12-19-2013 |
20140062435 | CHARGING CONTROL CIRCUIT - The present invention discloses a charge control circuit for supplying power from an external power source to a first common node and charging a second common node from the first common node. A regulator circuit is coupled between the external power source and the first common node, and a transistor is coupled between the first common node and the second common node. The present invention detects an operation parameter of the transistor and controls an internal voltage source to generate a non-predetermined voltage difference accordingly. When the sum of the voltage at the second common node and the non-predetermined voltage is equal to or higher than the reference voltage, the voltage at the first common node is regulated to a level higher than the voltage at the second common node, and the transistor is in an optimum conductive state. | 03-06-2014 |
20140084684 | POWER SUPPLY CIRCUIT - The present invention provides a power supply circuit, which includes a plurality of switchable bidirectional regulators, respectively coupled between a first common node and a plurality of external terminals, and each external terminal has a switchable connection selectively electrically connectable to a external power source for receiving power supply from the external power source or to an external device for charging the external device. Each switchable bidirectional regulator includes: an upper power transistor switch, a lower power transistor switch, an inductor, and a buck-boost controller for controlling operations of the upper power transistor switch and the lower power transistor switch to perform either buck or boost voltage conversion according to a mode control signal. | 03-27-2014 |
20140084845 | Charger and Charge Control Circuit for Use Therein - The present invention provides a charger circuit for supplying power from an external power source to a first common node and charging a second common node from the first common node; a regulator circuit is coupled between the external power source and the first common node. The charger circuit includes a switching regulator power stage for controlling charging to the second common node. The switching regulator power stage supplies power to the second common node according to detected voltage at the first common node, detected voltage at the second common node, and charging current to the second common node. | 03-27-2014 |
20140152104 | Multi-Output Switching Regulator and Multi-Output Power Supply Method - The present invention discloses a multi-output switching regulator and a multi-output power supply method. The multi-output switching regulator includes: a power stage circuit for operating at least a power switch included therein and only one inductor included therein in response to a pulse width modulation (PWM) signal, thereby converting an input voltage to a converted voltage; a multiple outputs circuit for receiving the converted voltage to generate a plurality of output currents; a voltage detecting circuit for generating a feedback signal according to the converted voltage; and a PWM signal generation circuit for generating the PWM signal in response to the feedback signal. | 06-05-2014 |
20140159492 | Power Bank Circuit - The present invention discloses a power bank circuit. The power bank circuit includes a charger circuit, a battery circuit, a power conversion circuit, a temperature detecting circuit and a current distribution circuit. The charger circuit receives an input voltage and provides a charging current to the battery circuit. The power conversion circuit converts a battery voltage to an output voltage and provides an output current. The temperature detecting circuit detects the temperature of the packaged structure. When the temperature of the packaged structure exceeds a first predetermined temperature, the current distribution circuit first reduces the output current. When the temperature of the packaged structure exceeds a second predetermined temperature, the current distribution circuit then reduces the charging current. | 06-12-2014 |
20140159644 | Charger Circuit and Charging Control Method - The present invention discloses a charger circuit and a charging control method for charging a battery. When the battery voltage reaches a predetermined voltage, the charge storage quantity of the battery is measured to determine whether to charge the battery according to a constant current mode wherein the battery is charged by a constant current, or the battery voltage is a target to be regulated to a target voltage according to a constant voltage mode. | 06-12-2014 |
20140191742 | Voltage Regulator, and Control Circuit and Control Method Thereof - The present invention discloses a method for controlling a voltage regulator, including steps of: converting an input voltage to an output voltage and providing an output current; sensing the output current; reducing the output voltage; and when the reduction of the output voltage causes the output current to change, setting the output voltage back to a value which does not change the output current. | 07-10-2014 |