Entries |
Document | Title | Date |
20080205095 | Ripple compensator and switching converter having such a ripple compensator - Systems and methods for compensating ripple current and improved ripple compensators and switching converters capable of compensating ripple current. In one embodiment, the ripple compensator for a switching converter of the type includes a switching means and filtering means comprises means for injecting a compensating current such that the AC component of the switching current and the compensating current are in opposite phase. In addition, the compensation current is elaborated from a signal at a node between the switching means and the filtering means. | 08-28-2008 |
20080212343 | INVERTER BASED STORAGE IN DYNAMIC DISTRIBUTION SYSTEMS INCLUDING DISTRIBUTED ENERGY RESOURCES - A microsource is provided, which includes an inverter, an energy storage device, and a controller. The controller calculates a maximum frequency change for the inverter based on a first comparison between a first power set point and a measured power from the inverter. The first power set point is defined based on a charge level of the energy storage device. A minimum frequency change for the inverter is calculated based on a second comparison between a second power set point and the measured power from the inverter. An operating frequency for the inverter is calculated based on a third comparison between a power set point and a measured power flow. A requested frequency for the inverter is calculated by combining the maximum frequency change, the minimum frequency change, and the operating frequency. The requested frequency is integrated to determine a phase angle of a voltage of the inverter to control a frequency of an output power of the inverter. | 09-04-2008 |
20080278977 | Method for operating a converter circuit, and device for carrying out the method - A method for operating a converter circuit is specified with the converter circuit having a converter unit with a multiplicity of controllable power semiconductor switches and having an energy storage circuit formed by two series-connected capacitors, in which the controllable power semiconductor switches are controlled by means of a control signal formed from a hysteresis signal vector (x), and the hysteresis signal vector (x) is formed from a difference-phase connection current vector (Δi | 11-13-2008 |
20080291705 | Method for regulating a voltage or a current of an RLC filter, a recording medium and vehicles for this method - This deadbeat control method for regulating an output voltage U | 11-27-2008 |
20090059626 | SWITCHING POWER SUPPLY DEVICE AND CONTROL DEVICE THEREOF - The invention provides a switching power supply device that can restrain the variation in the ripple of the output voltage corresponding to the variation in the input voltage and a control device thereof. When output voltage Vout is higher than a target value, switching converter circuit | 03-05-2009 |
20090257252 | Power supply device for an electric circuit - In the case of a power supply device ( | 10-15-2009 |
20090257253 | METHOD FOR OPERATING A CONVERTER CIRCUIT AND APPARATUS FOR IMPLEMENTING THE METHOD - The disclosure specifies a method for operating a converter circuit, the converter circuit having a converter unit with a large number of drivable power semiconductor switches and with a three-phase electrical AC voltage system, in which the drivable power semiconductor switches are driven by means of a drive signal (S | 10-15-2009 |
20090284996 | SYSTEM AND METHOD OF CANCELLING NOISE RADIATED FROM A SWITCH-MODE POWER CONVERTER - A switch-mode power converter comprises a converter circuit and an auxiliary switching circuit. The converter circuit comprises a storage component configured to temporarily store input energy; and at least one switch configured to control release of the stored energy from the storage component. The auxiliary switching circuit is coupled to the storage component, the auxiliary switching circuit comprising an auxiliary switch having a duty cycle that is approximately 180 degrees out of phase with the duty cycle of the at least one switch in the converter circuit such that the auxiliary switching circuit produces compensating noise which substantially cancels noise radiated from the converter circuit. | 11-19-2009 |
20090290392 | ACTIVE EMI FILTERING USING MAGNETIC COUPLING CANCELLATION - An active electromagnetic interference (EMI) filtering may reduce the requirements for high current differential mode inductors. The active EMI filtering of the present invention may be useful in power devices that use switching power converters. Conventional EMI differential mode filtering devices may occupy up to 30% of the total weight and volume of the power electronics. Conventional differential mode filtering inductors tend to be large and heavy, especially so for high current input power lines. The present invention may replace the large conventional differential mode filtering inductors with a smaller set of coupled inductors. | 11-26-2009 |
20100027301 | BAND-PASS CURRENT MODE CONTROL SCHEME FOR SWITCHING POWER CONVERTERS WITH HIGHER-ORDER OUTPUT FILTERS - A DC-DC converter is described that contains multiple estimators and is self-oscillation. The converter also contains at least a fourth order output filter. The converter contains both feedback and feed-forward paths. The estimators estimate the current through inductors in the filter by sensing the voltage across the inductors. | 02-04-2010 |
20100073971 | Regulating Device for a Multi-Phase Voltage Converter - A regulating device for a multi-phase voltage converter includes a connecting element for picking-off an input/output voltage signal at a power path of the multi-phase voltage converter, and a filter, which is configured and coupled to the connecting element so as to cause the filter to output a filter output signal, which correlates to the ripple of the input/output voltage signal. A correcting unit is configured and connected to the filter and to the multi-phase voltage converter such that, owing to the correcting unit, an actuating signal is output to the multi-phase voltage converter, which actuating signal generates a change in the ripple of the input/output voltage signal. | 03-25-2010 |
20100073972 | ON-DIE ANTI-RESONANCE STRUCTURE FOR INTEGRATED CIRCUIT - A structure and method for reducing the effects of chip-package resonance in an integrated circuit assembly is described. A series RLC circuit is employed to reduce the output impedance of the power delivery system at the resonance frequency. | 03-25-2010 |
20100149842 | Low EMI Producing Switch-Mode Power Supply Within An Intelligent Electronic Device - An apparatus for varying the timing of a SMPS, including a microcontroller configured to output a first PWM signal. A converter is coupled to the microcontroller and is configured to receive the first PWM signal and output an analog signal to a SMPS timing capacitor coupled to a SMPS. The analog signal varies the discharge time of the timing capacitor to vary a switching frequency of the SMPS. | 06-17-2010 |
20100165675 | SYSTEM AND METHOD FOR CONTROLLING VARIATIONS OF SWITCHING FREQUENCY - System and method for providing frequency control to a power converter. The system includes a pseudorandom signal generator configured to generate a digital signal. The digital signal is associated with at least an N-bit datum, and N is a positive integer. Additionally, the system includes a digital-to-analog converter configured to receive the digital signal and generate a first control signal, an output signal generator configured to receive the first control signal and generate at least a first output signal associated with a frequency, and a pulse-width-modulation generator configured to receive at least the first output signal. The N-bit datum represents a pseudorandom number. | 07-01-2010 |
20100177538 | System and Method for Power Supply Testing - In one embodiment, a method of verifying a component coupled to an output of a power supply includes measuring a frequency response from a control input of the power supply to the output of the power supply. The method also includes comparing the frequency response to a predetermined metric based on the measuring. The component is determined to be valid if the frequency response falls within the predetermined metric. | 07-15-2010 |
20100177539 | ELECTRICAL APPLIANCE AND POWER SUPPLY THEREOF - A power supply includes an adapter and a delay module. The adapter is operable to receive an input voltage and convert the input voltage into a first operation voltage to power a load controlled by a control unit. The adapter includes a filter capacitor configured to smooth the first operation voltage. The delay module detects the input voltage, and supplies a second operation voltage to the control unit when receiving the input voltage. The delay module continues supplying the second operation voltage to the control unit for a predetermined time period after the input voltage is no longer supplied to the adapter. As a result, the load operates for at most the predetermined time period and the filter capacitor discharges via the load after the input voltage is removed. | 07-15-2010 |
20110032735 | UNIVERSAL THREE PHASE CONTROLLERS FOR POWER CONVERTERS - The systems and methods described herein provide for a universal controller capable of controlling multiple types of three phase, two and three level power converters. The universal controller is capable of controlling the power converter in any quadrant of the PQ domain. The universal controller can include a region selection unit, an input selection unit, a reference signal source unit and a control core. The control core can be implemented using one-cycle control, average current mode control, current mode control or sliding mode control and the like. The controller can be configured to control different types of power converters by adjusting the reference signal source. Also provided are multiple modulation methods for controlling the power converter. | 02-10-2011 |
20110051475 | REGULATOR CIRCUITRY FOR REDUCING RIPPLE RESULTED FROM LINE VOLTAGE TRANSMITTING TO SECONDARY SIDE OF POWER TRANSFORMER - The present invention discloses a regular circuitry for reducing ripple resulting from a line voltage transmitting to a secondary side of a power transformer. The regular circuitry electrically connected in parallel with the power transformer includes a ripple sampling circuit, a proportional amplifier circuit, and a reversing amplifier circuit. The ripple sampling circuit selects a sampling ripple from the input port of the power transformer, which is electrically connected in series between a primary side rectification circuit and a secondary side rectification circuit. The proportional amplifier circuit receives the sampling ripple to generate an amplified sampling ripple. The amplified sampling ripple transmits to the reversing amplifier circuit so that a reversed sampling ripple is generated. Thus, the reversed sampling ripple can be input to the output port of the power transformer to superimpose on the signal output from the power transformer to reduce the ripple resulting from the line voltage. | 03-03-2011 |
20110063881 | SYSTEM AND METHOD FOR AUTOMATICALLY TUNING A VOLTAGE CONVERTER - A power converter system is provided, comprising a plant having a plant input and a plant output; and a plant identification filter that receives the plant input and the plant output, and estimates the values of poles and zeros of the plant, wherein the plant identification filter updates the estimates of the poles and zeros, based upon the plant input and the plant output, beginning from an initial state; and a rate at which the plant identification filter updates the estimates of the values of the poles and zeros is slower than a rate at which the plant input and the plant output are received by the plant identification filter. | 03-17-2011 |
20110222321 | POWER CONVERTER AND METHOD FOR CONTROLLING THE SAME - An oscillation control part composed of a control switching element and a damping resistance connected in parallel is arranged between an input power supply and a main switching element of a power conversion circuit, and the control switching element and the main switching element have a relationship such as Ron(S2)09-15-2011 | |
20110235372 | Systems And Methods For Scaling A Signal In A Power Factor Correction Circuit - Systems and methods for scaling a current signal in a power factor correction circuit are disclosed. An exemplary method may include providing a power factor correction circuit for a power supply, the power factor correction circuit having a first current sensing resistor connected on a return path to a rectified AC line. The method may also include measuring current across the first current sensing resistor. The method may also include switching on at least a second current sensing resistor in parallel with the first current sensing resistor if the measured current increases above a threshold value. | 09-29-2011 |
20110305050 | METHODS FOR MINIMIZING DOUBLE-FREQUENCY RIPPLE POWER IN SINGLE-PHASE POWER CONDITIONERS - A method is provided for minimizing a double-frequency ripple power exchanged between a load and an energy source, the energy source delivering electrical power to the load through a single-phase power conditioner, and the power conditioner being coupled to an energy storage device. The method includes determining a phase shift of an AC output signal of the power condition and an average AC output power of the power conditioner. The average AC output power may be a predetermined value or a calculated value based on sensed or measured signals. The method further includes generating an AC signal at an energy storage device. The generated AC signal has an amplitude that is a function of the average AC output power and a phase shift substantially equal to 45 degrees minus an amount that is dependent on the determined phase shift. In some embodiments, the phase shift may be determined to be of a non-zero value. | 12-15-2011 |
20120092906 | ARRANGEMENT FOR EXCHANGING POWER - An arrangement for exchanging power with a three-phase electric power network comprises a Voltage Source Converter having three phase legs with each a series connection of switching cells. The three phase legs are interconnected by forming a delta-connection. The arrangement also includes a control unit configured to calculate a value for amplitude and phase position for a zero-sequence current for which, when circulated in the delta-connection circuit of the three phase legs, the balance of the total direct voltage of each of the three phase legs with respect to the other two phase legs is restored will there be an unbalance and control the semiconductor devices of switching cells of the phase legs to add such a zero-sequence current to the currents of each phase leg of the converter. | 04-19-2012 |
20120170332 | EMI MITIGATION OF POWER CONVERTERS BY MODULATION OF SWITCH CONTROL SIGNALS - The present invention provides for EMI mitigation in switching circuitry, such as power converters, by implementing a controlled, non-random change in frequency in every cycle of switch control signals based on a static or dynamically changing modulation cycle. This permits frequency spreading across a wide range while avoiding excessive jitter between cycles and voltage dropouts common to randomized EMI control circuitry. Further, since it may be implemented digitally, some embodiments may avoid performance, size and power consumption problems experienced by mixed signal or analog switch control circuitry and EMI control circuitry. Further still, implementations of the present invention may mitigate EMI from a constant frequency source without the necessity of a variable frequency source, such as one generated by a VCO, to realize frequency variation. By eliminating the need for analog and mixed signal circuitry, and additional corrective circuitry, some embodiments may also reduce design, testing and production costs. | 07-05-2012 |
20120236606 | METHOD AND SYSTEM FOR APPLYING POWER HARMONICS TO SECONDARY LOADS - A system and method for harvesting and applying power harmonics (e.g., harmonic distortion) comprises a shunt filter that is harmonically tuned for one or more connected loads. The shunt filter generally comprises at least one inductor connected serially to at least one capacitor. Additionally, the output leg of the capacitor (i.e., not connected to the inductor) is connected to at least one load. Operatively, the shunt filter separates harmonic current and, in some instances, the fundamental current from the root mean square current originating from a power source delivering power to the one or more connected loads. Illustratively, the harmonic current is directed to the one or more connected loads. The neutral current originating from the one or more filter connected loads is then returned back to the power source. | 09-20-2012 |
20130077359 | Power Supply and Method of Operation - A switched-mode power supply (SMPS) and a method of control thereof is described, wherein the SMPS is operable to apply a spread spectrum modulation to a switching driver signal to reduce EMI in the SMPS. The SMPS is operable to perform voltage and current monitoring in parallel to the spread spectrum modulation to provide variable limit threshold detection and shutdown capabilities for circuit protection. | 03-28-2013 |
20130201733 | ISOLATED DYNAMIC CURRENT CONVERTERS - Isolated Dynamic-Current (“Dyna-C”) converters are converters that convert incoming 3-phase AC or DC power to a mix of DC and AC power via an isolation link. In various embodiments, the isolation link is a high-frequency isolation transformer. Isolated Dyna-C converters may provide a high-frequency galvanic isolation and are able to convert three-phase AC power to three-phase AC power, or three-phase AC power to DC and vice versa. The topology is minimal and the costs are low. Isolated Dyna-C converters provide fast current responses and keep the losses low by using a simplified two-stage conversion and providing a magnetizing current that is dynamically controllable and tailored to the load. An isolated Dyna-C converter may synthesize currents at its input or output ports with an arbitrary phase that is relative to the grid or load voltages, thereby enabling a full independent control over the active and reactive power at its ports. | 08-08-2013 |
20130201734 | DEVICE FOR SUPPRESSING HIGH-FREQUENCY CURRENTS IN INFEED LINES OF AN INVERTER - A device for suppressing high-frequency currents in infeed lines to an inverter having a common-mode impedance. A magnetic core is configured for inductively coupling the infeed lines, wherein the current load on the common-mode impedance is minimized. A snubber impedance unit is inductively coupled to the common-mode impedance and has a frequency-dependent impedance. | 08-08-2013 |
20130250630 | METHOD FOR CONTROLLING ALTERNATING CURRENT OUTPUT OF PHOTOVOLTAIC DEVICE AND ALTERNATING CURRENT PHOTOVOLTAIC DEVICE - A method for controlling an alternating current (AC) output of a photovoltaic (PV) device, and an AC PV device are introduced herein. The method includes: receiving solar radiant energy by using a PV cell array and then converting the solar radiant energy into a direct current (DC) energy output; and selecting an arrangement and combination sequence of the PV cells by using a control module, to vary a voltage according to a timing (frequency), so that a sine-like wave output is obtained at an output terminal. | 09-26-2013 |
20130308352 | METHOD FOR IMPROVING PERFORMANCE OF FILTER AND POWER CONVERSION APPARATUS - A power conversion apparatus is disclosed in the present application. The power conversion apparatus comprises: a power converter comprising an energy-storage magnetic component, and a filter comprising an inductor component and a two-port network connected the energy-storage magnetic component and the inductor component, wherein a series resonance is formed by the two-port network and a mutual inductance which is formed by a coupling between the energy-storage magnetic component and the inductor component. | 11-21-2013 |
20130322134 | NOISE REDUCTION UNIT, POWER SUPPLY DEVICE, AND METHOD FOR DISPOSING CORES IN NOISE REDUCTION UNIT - A noise reduction unit includes a plurality of cores each having formed therein a through hole, a plurality of wires connected to a noise source and each wound around the corresponding core through the through hole, and a core supporting member that supports the plurality of cores. The core supporting member supports the plurality of cores in such a manner that the plurality of cores is disposed parallel to each other along a through direction of the through holes and spaced apart from each other with a predetermined gap in the through direction. | 12-05-2013 |
20130322135 | COMPACT, METHOD FOR PRODUCING COMPACT, REACTOR, CONVERTER, AND POWER CONVERSION DEVICE - A low-loss compact and a method for producing the compact are provided. | 12-05-2013 |
20140063872 | Digital EMI Filter - The invention provides a digital active EMI filter that removes, minimizes, or reduces unwanted interference (i.e., EMI noise) generated by a power circuit such as, for example, a power converter. Digital active filtering includes digital sampling of the incident noise signal amplitude and frequency, discrete time conversion of the EMI noise source, processing (e.g., inverting) the digital signal, and then constructing an analog output signal (i.e., an EMI compensation signal) which is injected to the input of the power circuit. A digital EMI filter as described herein may be used in both differential-mode and common-mode configurations, and overcomes limitations of passive and active analog EMI filters. | 03-06-2014 |
20140104899 | CONVERTER ARRANGEMENT - A converter arrangement has at least one AC voltage connection, at which an alternating current can be fed in or drawn, and at least one DC voltage connection, at which a direct current can be fed in or drawn. The converter arrangement contains at least two series circuits connected in parallel. The external connections of the series circuits form the DC voltage connections of the converter arrangement. Each of the series circuits is connected in parallel and contains in each case at least two submodules connected in series, each of the submodules containing at least two switches and a capacitor. An energy store is to be connected to the capacitor of at least one of the submodules, wherein a filter is connected electrically between the capacitor and the energy store. | 04-17-2014 |
20140169046 | POWER SUPPLY APPARATUS WITH LOW STANDBY POWER CONSUMPTION - An electronic apparatus is removed from a power supply apparatus and that can be certified by detecting a secondary-side transformer coil by a no-load detecting unit. The no-load detecting unit is configured to turn off an output switch unit and a power factor correction and pulse width modulation controller. An intermittent driving unit is configured to drive a start unit once a pre-determined time. The start unit is configured to drive the power factor correction and pulse width modulation controller. A load detecting unit is configured to detect that the electronic apparatus is connected to the power supply apparatus. The load detecting unit is configured to drive the intermittent driving unit. The intermittent driving unit is configured to drive the start unit. The start unit is configured to drive the power factor correction and pulse width modulation controller. | 06-19-2014 |
20140177294 | SYSTEMS AND METHODS FOR SUPPRESSING RESONANCES IN POWER CONVERTERS - Systems and methods for suppressing resonances in power converters are provided. A power converter ( | 06-26-2014 |
20140218979 | POWER CONVERSION DEVICE - A power conversion device has a power module that switches the ON/OFF state of a switching element and converts and outputs input power, a metal housing that houses the power module, and a conductive member connected to the housing. The conductive member is connected to the housing at a position having a length of nλ/4 from the open end. More specifically, “n” is an odd number of 1 or greater, “λ” is the wavelength of noise generated by switching the switching element ON or OFF. | 08-07-2014 |
20140233281 | POWER CONVERTER WITH NOISE-CURRENT REDUCTION CAPACITOR - In a power converter, a housing is grounded. A power converter circuit is installed in the housing and configured to perform power conversion of input power into output power. An external terminal is electrically connected to the power converter circuit for connection of an external device to the power converter circuit. A first capacitor has first and second electrodes. The first electrode of the first capacitor is connected to the external terminal, and the second electrode thereof is connected to the housing. A second capacitor has first and second electrodes. The first electrode of the second capacitor is connected to the external terminal, and the second electrode thereof is connected to the housing. The first capacitor, the external terminal, the second capacitor, and the housing is arranged to provide a conductive loop. | 08-21-2014 |
20140233282 | NOISE FILTER - A noise filter is assembled to an electric power conversion device and has a metal housing casing and two capacitors connected to an external terminal of the device through which an electric power conversion circuit is connected to an external device. The two capacitors, the housing casing and the external terminal make a current loop. A magnetic flux of an alternating magnetic field generated in a part of the electric power conversion circuit penetrates in a first area and a second area formed in the current loop. A first induced noise current is induced in the current loop when the magnetic flux of the generated magnetic field penetrates in the first area. A second induced noise current is induced in the current loop when the magnetic flux penetrates in the second area so that the first induced noise current flows in a reverse direction to the second induced noise current. | 08-21-2014 |
20140301118 | SWITCHING POWER SUPPLY DEVICE - The invention provides a switching power supply device such that the occurrence of noise is reduced by jitter control of a switching frequency. The switching power supply device includes a switching power supply device main body wherein a predetermined output direct current voltage is obtained by switching an input alternating current voltage using a switching element, a switching control unit that controls the switching frequency in accordance with a feedback voltage that indicates the difference between an output set voltage and the output direct current voltage, a jitter control unit that applies jitter to the switching frequency, and a jitter amplitude control unit that changes jitter amplitude caused by the jitter control unit in accordance with the feedback voltage. | 10-09-2014 |
20140321172 | SYSTEMS AND METHODS FOR A DC PHASEBACK CHOKE - Phaseback DC choke includes a common core, a first coil formed about the common core, and a second coil formed about the common core in parallel opposing configuration relative the first coil. A DC circuit including a Phaseback DC choke is also provided. | 10-30-2014 |
20140347899 | CONTROL METHODS FOR POWER CONVERTERS - A method of operating a power converter arrangement, the power converter arrangement includes a dc link and a dc load/source, an active rectifier/inverter having dc terminals connected to the dc link and is adapted to provide a variable dc link voltage between a maximum and a minimum limits, an interleaved buck converter having a plurality of converter circuits connected between the dc link and the dc load/source, wherein each converter circuit includes a first switch, a second switch, and a reactor, the method including determining one or more null values of dc link voltage with reference to the voltage across the dc load/source, and if a null value of dc link voltage is between the maximum and the minimum limits, controlling the active rectifier/inverter to provide a dc link voltage that is substantially the same as the null value of dc link voltage. | 11-27-2014 |
20140376283 | SYSTEMS AND METHODS FOR ACTIVE DAMPING DEVICE FOR STABILIZING A POWER GRID OF ACTIVE SOURCES AND LOADS - Embodiments relate to systems and methods for an active damping device for stabilizing a power grid of active sources and loads. In power system networks or grids which incorporate active power sources and active loads, such as motors, the output voltage transfer function can exhibit instabilities due to the presence of poles in the positive real portion (right hand side) of the complex plane. Those poles can induce uncontrolled ringing, oscillations, or other artifacts or instabilities. According to implementations, an active damping element can be introduced into the power system grid, which operates to drive the poles of the output transfer function to the negative real (left hand) portion of the complex plane. Output voltage and other parameters can thereby be stabilized. In implementations, the damping element can include an R-C network for DC output systems, or a controller including a voltage source inverter for AC output systems. | 12-25-2014 |
20140376284 | SYSTEMS AND METHODS FOR TUNING THE CONTROL OF A SHUNT ACTIVE POWER FILTER OVER A VARIABLE FREQUENCY - Embodiments relate to systems and methods for tuning the control of a shunt active power filter over a variable frequency. In aspects, a shunt active power filter is provided to filter current harmonics from the output delivered to a dc load via a recitifier. The shunt active power filter control can be configured as a set of resonant regulators connected in a parallel configuration. Each of the resonant regulators can be tuned to dampen or eliminate a particular harmonic, such as the 5th, 7 | 12-25-2014 |
20150029765 | HIGH FREQUENCY INDUCTOR FILTER APPARATUS AND METHOD OF USE THEREOF - The invention comprises a high frequency inductor filter apparatus coupled with an inverter yielding high frequency harmonics and/or non-sixty Hertz output. For example, an inductor/converter apparatus is provided using a silicon carbide transistor that outputs power having a carrier frequency, modulated by a fundamental frequency, and a set of harmonic frequencies. A filter, comprising an inductor having a distributed gap core material and optional magnet wires, receives power output from the inverter/converter and processes the power by passing the fundamental frequency while reducing amplitude of the harmonic frequencies. | 01-29-2015 |
20150092459 | FILTER APPARATUS, A METHOD FOR FILTERING HARMONICS IN AN ELECTRICAL POWER TRANSMISSION OR DISTRIBUTION SYSTEM, AND SUCH A SYSTEM - A filter apparatus includes at least one filter, each filter being tunable and including at least one capacitor arrangement. The capacitor arrangement includes a plurality of first capacitors, a plurality of second capacitors, and a plurality of switches. Each switch is switchable between a non-conducting mode and a conducting mode. The plurality of second capacitors and the plurality of switches are arranged to connect or disconnect the second capacitors on different potentials in order to tune the filter by adjusting the capacitance of the filter. An electrical power transmission or distribution system includes such a filter apparatus. A method is provided for filtering harmonics in an electrical power transmission or distribution system by means of such a filter apparatus. | 04-02-2015 |
20150333612 | APPARATUS FOR FILTERING HARMONICS IN RAILWAY CONTACT LINES AND METHOD - An apparatus and a method for filtering harmonics in a power transmission contact line of a railway system includes a multilevel converter multilevel converter having one single phase leg, which phase leg comprises switching cells, each switching cell comprises semi-conductor switches arranged to selectively provide a connection to a corresponding energy storage element. The multilevel converter also includes a controller provided to control the switching of each switching cell, and wherein the phase leg is configured in two parallel branches of cascaded switching cells, which branches is interconnected in a closed circuit. The controller is provided to monitor the content of harmonics in the contact line, and is adapted to filter the monitored harmonics by means of adapting the switching of the switching cells to absorb the harmonics. | 11-19-2015 |
20150340967 | CELLS CONTROL IN A MULTILEVEL CONVERTER - Cells in a phase leg of a multilevel converter are controlled through regulating, using tap-changer control, the modulation index of the converter to above 0.80, providing a group of carrier waves for the phase leg, where these carrier waves are identical but displaced in time from each other with a time delay, providing a voltage reference for the phase leg being separate from voltage references provided for other phase legs, stop switching of the cells when waveform values of a power transmission converter waveform are detected to be in a selected interval around a peak value of the power transmission converter waveform and control switching of the cells based on comparisons of the respective carrier waves with the voltage reference when the waveform values of the power transmission converter waveform are detected to be outside the selected interval. | 11-26-2015 |
20150349626 | OUTPUT FILTER FOR PARALLELED INVERTER - A power conversion system includes a paralleled inverter and a plurality of coupling inductors. The paralleled inverter is configured to convert a direct current input into an alternating current output and includes a first inverter having a first plurality of phase outputs and a second inverter having a second plurality of phase outputs, which may achieve negligible common-mode output voltage. The plurality of coupling inductors connect one of the first plurality of phase outputs with one of the second phase outputs to filter differential-mode electromagnetic interference and circulation current. | 12-03-2015 |
20150349628 | SWITCHING POWER SUPPLY, EMI FILTER, COMMON MODE INDUCTOR AND WRAPPING METHOD FOR THE COMMON MODE INDUCTOR - The present disclosure provides a switching power supply, an EMI filter, a common mode inductor and a wrapping method for the common mode inductor. The common mode inductor includes a first coil winding and a second coil winding. The wrapping method for a common mode inductor includes steps of: disposing two isolation blocking sheets at different positions of a magnetic core; wrapping the first coil winding around the magnetic core, wherein the first coil winding is divided into two wrapping areas by one of the isolation blocking sheets; wrapping the second coil winding around the magnetic core, wherein the second coil winding is divided into two wrapping areas by the other one of the isolation blocking sheets, wherein the first coil winding and the second coil winding are symmetrically wrapped. | 12-03-2015 |
20160049867 | ELECTRONIC CONVERTER CIRCUIT SYSTEM AND CONTROL METHOD - An electronic converter circuit system and a control method are disclosed. The electronic converter circuit system has a digital control platform, centered on a digital control chip, consisting of a hardware circuit and software, and built in with single-end, push-pull, half-bridge, full-bridge type control modes. By simple setting, the circuit system works in corresponding modes. The electronic converter circuit system mainly controls the field-effect tubes and IGBT. Control orders in the control process are output after comprehensive diagnosis of the modules by the software control platform. During conversion, the circuit works stably and has high conversion efficiency. Besides, in the control process of the electronic converter circuit system, the environmental parameters such as the temperature, humidity, altitude and intensity of the electromagnetic field of the working environment of the circuit system are tested, and various environmental factors are balanced to ensure that the whole circuit system works safely. | 02-18-2016 |
20180026521 | RIPPLE SUPPRESSION METHOD, CIRCUIT AND LOAD DRIVING CIRCUIT THEREOF | 01-25-2018 |