| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 363124000 | In chopper converter systems | 45 |
| 20080247204 | Regulator Device for a Three-Phase Ac Machine - A regulating apparatus for a three-phase AC machine has a DC controller and an inverter. An input of the inverter is coupled to the DC controller and an output of the inverter can be coupled to the AC machine. | 10-09-2008 |
| 20080266919 | Circuit apparatus for transformerless conversion of an electric direct voltage into an alternating voltage - In a circuit apparatus for transformerless conversion of an electric direct voltage of a two-pole direct voltage source ( | 10-30-2008 |
| 20080266920 | CONTROL APPARATUS OF POWER CONVERSION SYSTEM - The invention provides a control apparatus of a power conversion system for driving an induction motor via a VVVF inverter, wherein the AC voltage generated by the inverter is increased so as to expand the high-speed side property of the induction motor, to thereby improve the performance during power running and regenerative braking. In the present system, a DC power supply source having a power storage system with a capacity capable of processing the current flowing into or out of the inverter is inserted in series to the ground side of the input of the inverter, and the output voltage thereof is controlled from zero in a continuous manner to be added to the trolley voltage, which is then applied to the inverter. | 10-30-2008 |
| 20080316783 | Interleaved power factor correction pre-regulator phase management circuitry - Methods for power factor correction (PFC) and for reducing conduction losses and switching losses in a power converter as well as the power converter and phase management circuitry for the power converter. The power converter includes a first PFC pre-regulator interleaved with at least one additional PFC pre-regulator, and a step down converter. The average input power is measured downstream of the front end at the step down converter and the average current sense signal is compared to a reference voltage. Each additional PFC pre-regulator is disable when output power generated by the front end is less than a first pre-designated rated power level and each additional PFC pre-regulator is enabled when the output power is greater than a second pre-designated rated power level. | 12-25-2008 |
| 20090003024 | Inverter - The invention relates to an inverter for converting a DC voltage into an AC voltage having one or more phases, comprising
| 01-01-2009 |
| 20090046490 | IGBT/FET-BASED ENERGY SAVINGS DEVICE, SYSTEM AND METHOD - An IGBT/FET-based energy savings device, system and method ( | 02-19-2009 |
| 20090059632 | System And Method For Controlling A Current Limit With Primary Side Sensing Using A Hybrid PWM and PFM Control - A hybrid constant current control system that uses both pulse width modulation (PWM) and pulse frequency modulation (PFM) control. When transitioning from constant voltage mode to constant current mode the present invention can continue to control using PWM. Thereafter, when the voltage has dropped, the present invention smoothly transitions to PFM mode. The point of transition is based upon the switching frequency and the lowest rated voltage of operation. The system and method avoids very short (narrow) Ton times which ensures accurate constant current (CC) control with bipolar junction transistor (BJT) devices. The present invention also avoids acoustic noise because the switching frequency is maintained at a high enough level to avoid such acoustic noise even when the energy transferred through the transformer is still substantial and the output voltage is not too low. In addition the output current limit is insensitive to variation in the inductance-input voltage ratio, and is minimized against leakage inductance. | 03-05-2009 |
| 20090067206 | Rectifier Circuit and Three-Phase Rectifier Device - Choppers are provided respectively in the output stages of two diode bridges, and their output sides are connected in parallel to a smoothing capacitor. By controlling the operations of the two choppers, the currents which are allowed to be inputted to the diode bridges are made triangular waves of mutually opposite phases, or middle-phase waveforms of three phases. | 03-12-2009 |
| 20090103341 | Integrated bi-directional converter for plug-in hybrid electric vehicles - This invention relates to a power module for a plug-in hybrid electric vehicle including an integrated converter having a rectifier changing AC to DC, a DC/DC converter changing from a first voltage to a second voltage, and a battery storing electrical energy. The integrated converter operates in three modes 1) AC plug-in charging mode, 2) boost mode supplying power from the battery to the electrical bus and 3) buck mode supplying power from the electrical bus to the battery. The integrated converter utilizes the same single inductor during each of the three operating modes to reduce cost and weight of the system. | 04-23-2009 |
| 20090154207 | NEGATIVE VOLTAGE GENERATING CIRCUIT - A negative voltage generating circuit includes a pulse generator U | 06-18-2009 |
| 20090279333 | METHOD AND APPARATUS FOR REDUCING STANDBY POWER OF SWITCHING MODE POWER SUPPLIES - An apparatus for coupling a switching mode power supply (SMPS) controller to a rectified line voltage. The apparatus includes a high-voltage startup transistor configured to provide a charging current during a startup phase of the SMPS controller and to provide substantially no current during a normal operation phase of the SMPS controller. A switch coupled to the high-voltage startup transistor. The switch receives a control signal from the SMPS controller, for turning off the switch during the startup phase and turning on the switch during the normal operation phase. A biasing device is connected in series with the switch and maintains the startup transistor in an off state when the SMPS controller is in the normal operation phase. A standby current in the apparatus is substantially lower when the SMPS controller is in the normal operation phase than the charging current in the apparatus when the SMPS is in the startup phase. | 11-12-2009 |
| 20100097829 | POWER FACTOR CORRECTION CONVERTER - A power factor correction converter includes a diode bridge arranged to perform full-wave rectification on an AC input power supply, a switching element arranged to perform switching on an output voltage thereof, an inductor arranged to pass a current interrupted by the switching element and to accumulate and emit excitation energy, a diode, and a smoothing capacitor defining a step-up chopper circuit. A digital signal processing circuit detects a phase of an input voltage, and a switching frequency of the switching element is modulated in accordance with the phase. Accordingly, the switching frequency can be appropriately modulated without depending on an input voltage, so that a wide range of input voltages can be accepted while suppressing EMI noise with a peak generated in the switching frequency and higher-order frequency components thereof. | 04-22-2010 |
| 20100110738 | Switching power supply apparatus - In a switching power supply apparatus, multiplier | 05-06-2010 |
| 20100110739 | Control system of a power factor correction circuit - A control system for a power factor correction circuit performs stabilized oscillation operation and suppresses switching frequency variation due to change of the AC power source. A control system includes a voltage error amplifier for outputting a voltage error signal obtained by amplifying a difference between a DC output voltage Vo and a command value Vref of the DC output voltage, a current command value generating circuit for outputting a current command value Vi for controlling the input current Iin, a comparator comparing an inductor current signal obtained by detecting an inductor current running in the switching element by a current detecting resistor with a magnitude of the output signal Vi from the multiplier, a timer circuit for setting an off-period of the switching element corresponding to the voltage Vd, and a reset-set type flip-flop circuit for setting an off-timing of the switching element after an elapse of the off-period. | 05-06-2010 |
| 20100157636 | CONTROLLER FOR SWITCHING POWER CONVERTER DRIVING BJT BASED ON PRIMARY SIDE ADAPTIVE DIGITAL CONTROL - A controller of an AC/DC flyback switching power supply uses adaptive digital control approaches to control the switching operation of a BJT power switch based on primary-side feedback to regulate the secondary-side constant output voltage and output current, without using the input line voltage. Switching-cycle by switching-cycle peak current control and limit are achieved based on the sensed primary-side current rather than the input line voltage in both constant-voltage and constant-current modes, operating in PWM, PFM and/or combinations of a plurality of PWM and PFM modes. The controller IC does not need a separate pin and ADC circuitry for sensing the input line voltage. The controller IC directly drives the BJT base, and dynamically adjusts the BJT base current amplitude cycle by cycle based on load change | 06-24-2010 |
| 20100232191 | POWER CONDITIONER AND SOLAR PHOTOVOLTAIC POWER GENERATION SYSTEM - A first circuit generates a first sequence of square wave voltages having a voltage level that changes to a positive side relative to a first reference potential, which is a potential on a negative-electrode side of a direct current power source, from a direct current voltage. A second circuit generates a second sequence of square wave voltages having a voltage level lower than the voltage level of the first sequence of square wave voltages on the positive side that changes to a negative side relative to a second reference potential. The second chopper circuit further generates a third sequence of square wave voltages having a voltage level that changes to the positive and negative side in turns in the manner of sinusoidal wave relative to the first reference potential by summing the first sequence of square wave voltages and the second sequence of square wave voltages. A third circuit outputs the third sequence of square wave voltages as a charge/discharge output. The third circuit further PWM-controls the charge/discharge output so that a difference of the third sequence of square wave voltages to a sinusoidal wave voltage is corrected and thereby generates a sinusoidal wave voltage that continuously changes to the positive and negative sides relative to the first reference potential from the third sequence of square wave voltages and the PWM-controlled output, and outputs the generated sinusoidal wave voltage to a load. | 09-16-2010 |
| 20100232192 | POWER CONVERSION APPARATUS, POWER CONDITIONER, AND POWER GENERATION SYSTEM - A first chopper circuit generates a first sequence of square wave voltages having a voltage level that changes to a positive side by chopping a direct current voltage at a system frequency. A second chopper circuit generates a second sequence of square wave voltages having a voltage level that changes to a negative side by chopping a direct current voltage at a frequency twice as high as the system frequency. The second chopper circuit further generates a third sequence of square wave voltages having a voltage level that changes to the positive and negative side in turns in the manner of sinusoidal wave by summing the first sequence of square wave voltages and the second sequence of square wave voltages. A third chopper circuit chops the third sequence of square wave voltages at a frequency determined by a timing that depends on if a voltage difference thereof to a sinusoidal wave voltage results in a positive value or a negative value and outputting the chopped third sequence of square wave voltages as a charge/discharge output. The third chopper circuit PWM-controls the charge/discharge output at a PWM frequency so that the difference is corrected to thereby generate a sinusoidal wave voltage that continuously changes to the positive and negative sides. | 09-16-2010 |
| 20100246225 | POWER SUPPLY FOR SERVER - The present invention provides a power supply for a server including: a PFC (Power Factor Correction) unit for meeting harmonic regulation by being connected to an input power source; a DC/DC unit including a switching stage provided with at least one switching device to switch a voltage of a link capacitor as an output voltage of the PFC unit to a predetermined operation frequency and a DC/DC stage driven by the switching stage; a DC/DC control unit for controlling the DC/DC unit by being connected to the switching device; and a frequency varying circuit unit for supplying the DC/DC control unit with a frequency control signal to adjust the operation frequency of the switching device according to load after detecting an output current of the link capacitor and acquiring load information. | 09-30-2010 |
| 20100290260 | Structure of Serial Synchronous Chopper - An improved structure of serial synchronous chopper mainly includes an external synchronous rectifier power supply unit, an internal synchronous rectifier power supply unit, a synchronous voltage-stabilized control unit, an integrated driving circuit unit, a synchronous load feedback control unit, and a synchronous integrated chopping unit. While operating, the structure is serially connected to a live wire of a power supply to periodically perform synchronous chopping so as to provide a synchronous DC voltage-stabilized output as a fundamental power supply in connection with an external circuit. The structure entirely adopts a linear synchronous integral based design to greatly enhance the chopping efficiency and provide a more stable phase current reference point so that the overload protection response in a high-load operating environment is fast and secure, the loop interference and the power consumption of the chopping element can be simultaneously alleviated, the operating voltage is comparatively stable and the faulty rate is lower. | 11-18-2010 |
| 20100309696 | ELECTRICALLY-ISOLATED AC/DC CONVERTER - An AC/DC converter has at its input a rectifier circuit connected in series with a primary winding of an isolating transformer and with a chopper switch (T | 12-09-2010 |
| 20110019449 | POWER CONVERTER APPARATUS - A power converter apparatus having a configuration of a plurality of unit cells, including a DC capacitor and semiconductor devices, connected in cascade, includes a variable voltage source that is connected with a DC link, and a unit having a function that initially charges up the DC capacitor in the unit cell alone selected at a time of an initial charge. | 01-27-2011 |
| 20110044079 | Circuit and Method for Controlling the Power Supply of a Consumer with Current Pulses Having Steep Flanks - The present invention concerns a circuit for operating a consumer ( | 02-24-2011 |
| 20110110132 | TIME-LIMITING MODE (TLM) FOR AN INTERLEAVED POWER FACTOR CORRECTION (PFC) CONVERTER - The present invention provides a method of controlling an interleaved power factor correction (PFC) circuit operating in a discontinuous conduction mode (DCM). The controller employs a normal mode of operation in which inductor currents in each PFC sub-circuit are estimated based on the monitored input voltage and monitored output voltage, and switching devices associated with each PFC sub-circuit are controlled to ensure DCM operation. As the input voltage increases, the OFF times of each PFC sub-circuit increase such that the inductor currents no longer overlap. In response, the controller activates a time-limiting mode (TLM) in which OFF time durations for each sub-circuit are based on the monitored sum of load currents as opposed to the monitored input voltage and monitored output voltage. | 05-12-2011 |
| 20110110133 | FREQUENCY COMPRESSION FOR AN INTERLEAVED POWER FACTOR CORRECTION (PFC) CONVERTER - A controller provides frequency compression for an interleaved power factor correction (PFC) converter that determines the ON and OFF times of each switch associated with the PFC converter to prevent operating frequencies in the audible range. The controller includes a first circuit for generating an ON time current source having a magnitude related to an amplified error signal and the monitored input voltage, and a second circuit for generating an OFF time current source having a magnitude related to the ON time current source, the monitored input voltage, and the monitored output voltage. Gate drive circuitry provides gate drives signals to the switches of the interleaved PFC converter at a frequency determined by magnitudes of the ON time current source and the OFF time current source. | 05-12-2011 |
| 20110134670 | CONTROL ARRANGEMENT FOR A PFC POWER CONVERTER - In a PFC (power factor correction) control unit for controlling a PFC converter, a transconductance amplifier is coupled to receive a feedback signal representative of an output voltage of the PFC converter. The transconductance amplifier is coupled to generate an output error signal in response to the feedback signal. A PWM (pulse width modulated) converter is coupled to receive the output error signal, the PWM converter is coupled to generate a PWM signal in response to the output error signal. A chopper is coupled to receive the PWM signal. The chopper is coupled to switch a current representative of an input current of the PFC converter in response to the PWM signal. A filter is coupled to receive the switched current representative of the input current of the PFC converter. The filter is coupled to generate a PFC converter control signal in response to the filtered switched current representative of the input current of the PFC converter. | 06-09-2011 |
| 20110149622 | Interleaved Bridgeless Power Factor Corrector and Controlling Method thereof - In an interleaved bridgeless power factor corrector and a controlling method thereof, the interleaved bridgeless power factor corrector includes an AC input power supply, two input inductors, four active components, two passive components, an output capacitor, and an output resistor, wherein the four active components are cascaded in a full bridge form to act as control switches and rectifying switches having different phases; besides, the interleaved bridgeless power factor corrector is connected to a control signal processor and a control circuit, which can output complementary switch signals to control the interleaved bridgeless power factor corrector, thereby achieving output/input ripple cancellation and frequency multiplication. | 06-23-2011 |
| 20110211377 | POWER FACTOR CORRECTION CONVERTER - A PFC converter that rapidly and highly accurately detects current passing through an inductor so as to properly improve harmonics and the power factor as well as to correctly detect the operation state. In the PFC converter, a first current value is obtained by performing sampling at the middle portion of the on-period of a switching element, and a second current value is obtained by performing sampling at the middle portion of the off-period thereof. If the first current value and the second current value are equal or substantially equal to each other, then it is determined that the operation state is a continuous current mode, and if the first current value and the second current value are not equal or substantially equal to each other, then it is determined that the operation state is a discontinuous current mode. | 09-01-2011 |
| 20110216563 | HEMT/GaN Half-Bridge Circuit - A half-bridge circuit in accordance with an embodiment of the present application includes an input voltage terminal operable to receive an input voltage, a first bi-directional switch, a second bi-directional switch connected in series with the first bi-directional switch, wherein the first and second bi-directional switches are connected to the input voltage terminal such that the input voltage is provided across the first and second bi-directional switches and a controller operable to turn the first and second bi-directional switches ON and OFF such that a desired voltage is provided at an midpoint node positioned between the first bi-directional switch and the second bi-directional switch. The first bi-directional switch and the second bi-directional switch are high electron mobility transistors structured to allow for conduction in two directions when ON and to prevent conduction in any direction when OFF. | 09-08-2011 |
| 20110249477 | BRIDGE CIRCUITS AND THEIR COMPONENTS - A half bridge is described with at least one transistor having a channel that is capable in a first mode of operation of blocking a substantial voltage in at least one direction, in a second mode of operation of conducting substantial current in one direction through the channel and in a third mode of operation of conducting substantial current in an opposite direction through the channel. The half bridge can have two circuits with such a transistor. | 10-13-2011 |
| 20110286249 | METHOD AND DEVICE OF ELECTRICAL POWER - A power factor correction of three-phase boost-type conversion is disclosed. Embodiments comprising multi-leg autotransformers are disclosed, e.g. comprising 3-phase low-pass filtering impedances such as capacitors between an input of a converter and a midpoint of the output. | 11-24-2011 |
| 20120106215 | POWER CONVERSION APPARATUS AND BROWN-OUT PROTECTION METHOD THEREOF - A power conversion apparatus and a brown-out protection method are provided. The brown-out protection method includes sampling a rectification signal relating to an AC voltage received by the power conversion apparatus by adopting a discrete sampling means; and when a peak value of the sampled rectification signal has reached to a predetei mined value within a predetermined duration, making a pulse width modulation (PWM) control chip in the power conversion apparatus provide a PWM signal to switch a power switch in the power conversion apparatus, and thereby making the power conversion apparatus provide an output voltage to an electronic device; otherwise, making the PWM control chip to stop providing the PWM signal. | 05-03-2012 |
| 20120140536 | METHOD FOR FUNCTIONALLY CHECKING A VACUUM SWITCH OF A TRACTION CONVERTER - A method for functionally checking a vacuum switch of a traction inverter having a grid-side four-quadrant chopper and a load-side pulse inverter electrically connected in parallel on the DC side by a DC intermediate circuit. The AC side of the chopper is connected to a secondary winding of a traction transformer, with the primary winding of the traction transformer connectable to an AC grid voltage by a vacuum switch. When the vacuum switch is open, the chopper is actuated precisely when the AC grid voltage is temporally located relative to the chopper input voltage, such that the amplitude of a voltage difference between the AC grid voltage and the chopper input voltage corresponds to a predetermined test voltage. It is then checked whether current flows from the AC supply grid to the chopper. The functionality of the vacuum switch can thus be checked at any time without a test device. | 06-07-2012 |
| 20120250381 | POWER SUPPLY CIRCUIT - A power-supply circuit includes: a rectification circuit to output a rectified voltage obtained by rectifying an AC voltage; an inductor to be applied with the rectified voltage; | 10-04-2012 |
| 20130051100 | POWER SUPPLY DEVICE - A power supply device includes a failure determination means that detects, based on a current detected by a current detector, a failure of the switching elements of each of the chopper sections, and the failure determination means obtains values of the current detected by the current detector at the timing of falling edges of control signals to the switching elements of each of the chopper sections, determines the failure when the obtained current values differ from each other, and transmits a failure signal to a generation control means. When receiving the failure signal, the generation control means limits an output current from a generator in a way such that the withstanding current of a non-failed chopper section out of the chopper sections of the phases is not exceeded. | 02-28-2013 |
| 20130107595 | Control of a Switch in a Power Converter | 05-02-2013 |
| 20130107596 | POWER CONDITIONER | 05-02-2013 |
| 20130107597 | POWER CONDITIONER | 05-02-2013 |
| 20130170260 | POWER FACTOR CONTROL CIRCUIT AND POWER SOURCE DEVICE - A power factor control circuit of an embodiment includes an inductor, a switching element, a constant current element, a feedback coil, and a control circuit. The switching element is connected to one end of the inductor in series, performs a switching operation of repeating an on-state and an off-state when an input voltage is relatively high, continues the on-state when the input voltage is relatively low, and causes an input current to flow through the inductor. The constant current element is connected to the switching element in series and limits the current of the switching element. The feedback coil is magnetically coupled to the inductor, supplies a voltage to a control terminal of the switching element, and controls the switching element. The control circuit controls a constant current value of the constant current element depending on the input voltage. | 07-04-2013 |
| 20130336033 | Integrated Power Semiconductor Component, Production Method and Chopper Circuit Comprising Integrated Semiconductor Component - A monolithically integrated power semiconductor component includes a semiconductor body having first and second regions each extending from a first surface of the semiconductor body to a second opposing surface of the body. A power field effect transistor structure formed in the first region has a first load terminal on the first surface and a second load terminal on the second surface. A power diode formed in the second region has a first load terminal on the first surface and a second load terminal on the second surface. The second load terminals of the power field effect transistor structure and power diode are formed by a common load terminal. An edge termination structure is arranged adjacent to the first surface and in a horizontal direction between the first load terminal of the power field effect transistor structure and the first load terminal of the power diode. | 12-19-2013 |
| 20140016384 | CURRENT SENSING CIRCUIT AND CONTROL CIRCUIT THEREOF AND POWER CONVERTER CIRCUIT - A current sensing circuit and the control circuit thereof and a power converter circuit. The current sensing circuit includes a sample and hold circuit ( | 01-16-2014 |
| 20140133203 | Universal Power Conversion Methods - Methods and systems for transforming electric power between two or more portals. Any or all portals can be DC, single phase AC, or multi-phase AC. Conversion is accomplished by a plurality of bi-directional conducting and blocking semiconductor switches which alternately connect an inductor and parallel capacitor between said portals, such that energy is transferred into the inductor from one or more input portals and/or phases, then the energy is transferred out of the inductor to one or more output portals and/or phases, with said parallel capacitor facilitating “soft” turn-off, and with any excess inductor energy being returned back to the input. Soft turn-on and reverse recovery is also facilitated. Said bi-directional switches allow for two power transfers per inductor/capacitor cycle, thereby maximizing inductor/capacitor utilization as well as providing for optimum converter operation with high input/output voltage ratios. Control means coordinate the switches to accomplish the desired power transfers. | 05-15-2014 |
| 20140233288 | HIGH-FREQUENCY RMS-DC CONVERTER USING CHOPPER-STABILIZED SQUARE CELLS - An RMS-DC converter includes a chopper-stabilized square cell that eliminates offset, thus enabling high-bandwidth operation. The chopper-stabilized offset requires only a small portion of the circuitry (i.e., a single component square cell) which operates at high frequencies, and is amenable to using high-bandwidth component square cells. Using the chopping technique minimizes required device sizes without compromising an acceptable square cell dynamic range, thereby maximizing the square cell bandwidth. The RMS-DC converter consumes less power than conventional RMS-to-DC converters that requires a high-frequency variable gain amplifier. | 08-21-2014 |
| 20140268963 | DC VOLTAGE CONVERSION CIRCUIT - Aspects of the invention relates to a DC voltage conversion circuit including: a DC power supply; a switching device which is connected to two ends of the DC power supply through an inductor, and a series circuit which is connected in parallel with the switching device and which includes a diode and a load, so that an input voltage supplied from the DC power supply can be converted into an output voltage with a predetermined magnitude by an operation of the switching device and supplied to the load. The DC voltage conversion circuit can further include: a series circuit which is connected to two ends of the diode and which includes a snubber capacitor and a snubber diode. | 09-18-2014 |
| 20140286065 | ELECTRONIC SINE WAVE TRANSFORMER - There is provided an electronic sine wave transformer circuit configuration for transferring power from a source to a load using magnetic storage coupling, the circuit comprising: an input node adapted to receive an input alternating current power source having an input voltage operating at an input frequency in a Hertz range; the magnetic storage coupling unit comprising: a first set of windings coupled to a first switch, the first switch for receiving an input charging current associated with the input voltage; a second set of windings located in series or opposing connection with the first set of windings with a common magnetic path; a second switch connected at one end between the first and second set of windings and at another end to a common ground, the first and second switches having a switching frequency in a kilohertz range and switching between on and off in alternating modes; and an output node connected to the second set of windings, the output node adapted to provide an output AC power having a frequency of the input frequency to the load, the output power having an output voltage with an amplitude based on the input voltage and a voltage constant. | 09-25-2014 |
| 20150029770 | Method and Apparatus for Automatically Equalizing Bus Bar Voltages of Power Factor Correction PFC Circuit - An automatic equalization method and apparatus for bus bar voltages of a Power Factor Correction (PFC) circuit. The method includes calculating a difference in voltages of a positive bus bar and a negative bus bar, and increasing the rotation speed of a fan in the PFC circuit according to the difference in voltages of the positive bus bar and the negative bus bar until the voltages of the positive and negative bus bars are equalized. The apparatus includes a voltage difference module configured to calculate a difference in voltages of a positive bus bar and a negative bus bar, and a rotation speed control module configured to increase a rotation speed of a fan in the PFC circuit according to the difference in voltages of the positive bus bar and the negative bus bar, until the voltages of the positive and negative bus bars are equalized. | 01-29-2015 |
