Class / Patent application number | Description | Number of patent applications / Date published |
363041000 | By pulse modulation technique (e.g., PWM, PPM, etc.) | 46 |
20080198636 | SWITCHING CONTROLLER FOR PARALLEL POWER SUPPLY - A switching controller for a parallel power supply is disclosed. The switching controller includes an input circuit coupled to an input terminal to receive an input signal for generating a phase-shift signal, a first integration circuit coupled to the input circuit to generate a first integration signal in response to a pulse width of the input signal, and a control circuit coupled to the first integration circuit to generate a switching signal for switching the power supply, the switching signal being enabled in response to the phase-shift signal, a pulse width of the switching signal being determined in accordance with the first integration signal. | 08-21-2008 |
20080219035 | Active Power Filter - An active power filter comprises an energy storage capacitor, an inverter, a filtering circuit and a controller. The inverter is controlled to act as a virtual resister at a fundamental frequency for compensating for the power loss of the active power filter, act as a virtual capacitor at a fundamental frequency for compensating for a fundamental reactive power of the load, and/or generate a harmonic current for suppressing the harmonic currents of specific orders of the load. | 09-11-2008 |
20080291707 | Universal AC high power inveter with galvanic isolation for linear and non-linear loads - A universal alternating current (AC) inverter system with galvanic isolation takes an unregulated direct current (DC) input and provides a high-quality AC output that may be used in conjunction with both linear and non-linear loads. The universal AC inverter system includes a DC-DC converter for converting an unregulated DC input to a regulated DC output, and a DC-AC inverter for converting the regulated DC output to a high-quality AC output. The DC-DC converter includes a DC link isolation high frequency transformer that provides galvanic isolation between the unregulated DC input and the AC output. To avoid saturation of the transformer, the controller for the DC-DC converter employs a DC offset correction loop that prevents accumulation of DC content on the primary side of the transformer. The universal AC inverter system includes a 4-phase inverter topology that converts the regulated DC voltage provided by the DC-DC converter to an AC output. An inverter controller employs a number of feedback loops that are used to control switches within the 4-phase inverter topology to provide a high-quality AC output voltage for both linear and non-linear loads, including a fast voltage control loop, a slow voltage control loop, a AC output capacitor current control loop, and a DC content control loop. | 11-27-2008 |
20090021964 | Modularized Active Power Filter - A modularized active power filter includes a control module and at least one power module. The control module automatically identifies the number of the parallel connected power modules and generates one set of PWM signals to correspondingly control the parallel connected power modules, so as to provide a final compensation current by single power module or plural power modules. Thereby, the compensation demand of a load is met. Consequently, the modularized active power filter is able to improve the flexibility of compensation capacity, shorten the time for service, be suitable for mass production, and lower the manufacturing cost. | 01-22-2009 |
20090040797 | Pulse Width Modulation Method for a Power Converter - A pulse width modulation method has the steps of operating a second instruction signal so that each of the differences between two or three arbitrary instruction signals in three first instruction signals may become more than the predetermined value, and modulating in pulse width based on the second instruction signal. | 02-12-2009 |
20090161393 | PWM INVERTER - There is provided a PWM inverter capable of preventing a phase error from occurring in generating a PWM signal even in the case where a carrier wave frequency is not sufficiently higher than a signal wave frequency. A PWM signal generating section ( | 06-25-2009 |
20090201703 | Systems and Methods for Uninterruptible Power Supply Control - Systems and methods are provided for distributing power to a load by controlling an uninterruptible power supply that has an inverter and a filter, where the filter has an inductor and a capacitor. The systems and methods apply a pulse width modulation control signal to the inverter, sample inverter inductor current and compare the inductor current to a reference current. A duty cycle of the pulse width modulation control signal is adjusted to drive the inductor current at a second sampling time to a value substantially equal to a reference current at a first sampling time. The systems and methods can filter harmonic distortion from output signals and control uninterruptible power supply output. | 08-13-2009 |
20090225571 | MITIGATION OF UNBALANCED INPUT DC FOR INVERTER APPLICATIONS - Mitigating the DC content of an AC output from an inverter is important for electrical system reliability. The inverter may be powered by unbalanced DC inputs while still mitigating the DC content of the AC output wavefrom. The present invention provides methods to mitigate the DC content in the output DC voltage by reshaping the PWM reference signals (carrier signals) according to the DC content in such a way that the DC content is canceled. These reshaped PWM reference signals may be, for example, unsymmetrical reference waveforms. Unlike conventional methods for providing an AC voltage from a DC voltage with an inverter, which may result in DC content in the output AC voltage when an unbalanced DC input voltage is supplied, the present invention provides methods for mitigating the DC content in an AC voltage, even if the inverter providing the AC voltage is supplied with unbalanced DC voltage. | 09-10-2009 |
20090273952 | INVERTER WITH HIGH FREQUENCY ISOLATION TRANSFORMER - An inverter receives a DC power supply and converts it into AC power to a primary coil of a high frequency transformer. The output of the high frequency transformer passes through two secondary coils, and each secondary coil is associated with a bus. The busses supply positive and negative AC power to a downstream output. The flow of the power from the two busses is alternatively controlled to provide a desired frequency on the output. | 11-05-2009 |
20090284997 | METHOD TO CREATE PWM SWITCHING WITH NEAR ZERO COMMON MODE NOISE - A method for controlling a three-level inverter with a two-level inverter controller uses a conversion circuit to process the two-level control signals and output a set of three-level control signals. | 11-19-2009 |
20090316449 | INVERTER AND METHOD FOR CONTROLLING OUTPUT FREQUENCY OF INVERTER - An inverter includes a counter, a PWM generator, a central controller and a power converter. The counter is used for receiving a frame switch signal to generate a frame counting signal. The PWM generator is coupled to the counter, and is used to select a specific frequency among a plurality of predetermined frequencies according to the frame counting signal, and generate a modulated signal having the specific frequency. The central controller is coupled to the PWM generator, and is used to generate a processed signal according to the modulated signal. The power converter is coupled to the central controller, and is used to generate an output signal according to the processed signal. | 12-24-2009 |
20100008111 | Voltage Source Converter Station - The resistors of a filter block in a voltage source converter station are connected with a floating neutral point. | 01-14-2010 |
20100020573 | AUDIBLE NOISE SUPPRESSION IN A RESONANT SWITCHING POWER CONVERTER - Audible noise in resonant switching power converter during low-power burst mode operation is reduced by spreading the spectrum generated by the bursts, thereby reducing the amplitude of audio spectrum peaks in the current supplied through the resonant tank from a switching circuit. The spreading can be accomplished by varying the intervals between the bursts and/or by varying a pulse pattern within the bursts. The pulse pattern within the bursts can be varied by varying the number of pulses in the bursts, the polarity of the initial pulse of the bursts, and/or the duration of pulses within the bursts either uniformly or randomly. The burst pulse pattern may also be selected in alternation from a set of pulse patterns stored in a memory and the selection may be made randomly or systematically. | 01-28-2010 |
20100027302 | CONVERTER WITH REDUCED HARMONIC WAVES - Converter and method for controlling a converter with power semiconductor switches, having a filter ( | 02-04-2010 |
20100142234 | Partial regeneration in a multi-level power inverter - In one embodiment, the present invention includes a medium voltage drive system having multiple power cells each to couple between a transformer and a load. A first subset of the power cells are configured to provide power to the load and to perform partial regeneration from the load, and a second subset of the power cells are configured to provide power to the load but not perform partial regeneration. A controller may be included in the system to simultaneously control a DC bus voltage of at least one of the first subset of the power cells, correct a power factor of the system, and provide harmonic current compensation for the system. | 06-10-2010 |
20100157631 | AUDIBLE NOISE REDUCTION IN A POWER SUPPLY TRANSFOMER - This disclosure relates to a switching power supply with regulated voltage suppression to reduce transformer audio noise. | 06-24-2010 |
20100309693 | DRIVING METHOD AND DRIVING DEVICE FOR DRIVING A POLYPHASE INVERTER - A driving method for driving a polyphase inverter includes: receiving a reference input that includes a fundamental frequency component, and a previously generated feedback signal; generating an error signal that corresponds to a difference between the reference input and the previously generated feedback signal; attenuating the error signal to the minimum; generating an optimum signal; quantizing the optimum signal; and generating driving signals that correspond to the quantized optimum signal. A driving device that implements the driving method is also disclosed. | 12-09-2010 |
20110007532 | PWM Control Device and Driving Method thereof - In a pulse width modulation (PWM) control device and driving method, the PWM control device includes a PWM device, for providing a plurality of PWM signals; and a controller electrically connected to the PWM device and a plurality of driving circuits, for controlling PWM signals to arbitrarily enable or disable the plurality of driving circuits according to load capacity; wherein when driving circuits are damaged, the controller disables the damaged driving circuits and replaces the damaged driving circuits with the other driving circuits. | 01-13-2011 |
20110273914 | OUTPUT CURRENT DISTORTION COMPENSATING APPARATUS IN INVERTER - An output current distortion compensating apparatus in an inverter is disclosed, the inverter including an inverter controller generating a PWM signal for controlling a PWM voltage generator, wherein the inverter controller includes a first dead time compensation voltage generator generating a compensation voltage based on an output current polarity of each phase in the inverter, and a second dead time compensation voltage generator generating a compensation voltage based on an output current waveform of each phase in the inverter, and wherein a first dead time compensation voltage outputted from the first dead time compensation voltage generator and a second dead time compensation voltage outputted from the second dead time compensation voltage generator are added to generate a final dead time compensation voltage, thereby preventing occurrence of hunting phenomenon in which a current is greatly fluctuated. | 11-10-2011 |
20120087159 | QUADRATURE-CORRECTED FEEDFORWARD CONTROL APPARATUS AND METHOD FOR DC-AC POWER CONVERSION - An apparatus and method for controlling the delivery of a pre-determined amount of power from a DC source to an AC grid includes an inverter and an inverter controller. The inverter includes an input converter, an energy storage capacitor, and an output converter. The inverter controller includes an input converter controller and an output converter controller. The input converter controller includes feedforward controller configured to perform a calculation to determine a value for the duty cycle for the input converter such that: (1) the input converter delivers the pre-determined amount of power and (2) the magnitude of a ripple signal reflected into the input source is attenuated toward zero. The input converter controller may also include a quadrature corrector configured to determine the effectiveness of the calculation in attenuating the ripple and to adaptively alter the calculation to improve the effectiveness. | 04-12-2012 |
20120236607 | Unified Control of Single and Three-Phase Power Converters - Provided herein are unified control methods and implementations for controlling single and three-phase power converters. In an exemplary embodiment, a unified controller is provided that can be used to control a three-phase three-wire Voltage Source Inverter (VSI), a three-phase four-wire VSI, a three-phase grid-connected power converter for current shaping, and a single-phase full bridge VSI. | 09-20-2012 |
20120243273 | MULTI-LEVEL, MULTI-VOLTAGE MATRIX CONVERTER CIRCUIT AND METHOD FOR IMPLEMENTING SUCH A CIRCUIT - A matrix converter circuit with n symmetrical levels per phase including n conversion arms respectively supplied with n intermediate symmetrical voltage levels and connected at the output thereof to a common point generating an output current, characterized in that it includes:
| 09-27-2012 |
20120262957 | DISTRIBUTED POWER SUPPLY SYSTEM - A distributed power supply system in which no simultaneous disconnection from the system occurs when a system voltage momentarily drops is provided. It includes an inverter circuit that converts a direct current power generated by a direct current power supply and that supplies the alternating current power to an alternating current power supply power system, and an inverter control circuit for carrying out PWM control of the inverter circuit, wherein the inverter control circuit includes a three-phase voltage command signal generation unit, that is configured of a three-phase fundamental wave signal generation unit that generates three-phase fundamental wave signals from two phase components of voltage detected by a voltage detector, and a third harmonic signal generation unit that adds together third harmonic components of respective phases, having a predetermined amplitude, generated based on the three-phase fundamental wave signals. | 10-18-2012 |
20120300513 | WAVELET MODULATED INVERTER - This invention relates to a method for generating switching signals for inverters using wavelet basis functions as a means to determine switching times, pulse duration, shifting and scale; and to a three phase, six pulse wavelet modulated inverter employing the method as a switching technique. | 11-29-2012 |
20120300514 | METHOD AND DEVICE FOR DETERMINING A CONTROL SCHEME FOR AN ACTIVE POWER FILTER - A method is provided for determining a control scheme for a neutral point clamped (NPC) voltage source converter (VSC) with at least 3 levels and a topology of three bridge legs between each of three phases of a grid and a neutral point. Each leg includes at least four active switches, and a clamping carrier modulator synchronized with the grid is provided for the control of no-switching intervals. The method includes: analyzing the waveform of the grid and/or a load voltage and determining windows defining an allowed period for no-switching of the corresponding bridge leg; operating or simulating the operation of the voltage source converter with different clamping carrier modulator frequencies, and then analyzing the balance in the operating junction temperatures and/or power losses across the active switches and also analyzing the total losses of the voltage source converter; comparing the balance and the total losses of different clamping carrier modulator frequencies and selecting either the clamping carrier modulator frequency according to showing, as primary criterion, the better balance and, as secondary criterion, the lower total losses; operating or simulating the operation of the voltage source converter with the selected clamping carrier modulator frequency, while iteratively changing at least one of the following operating parameters of the voltage source converter: switching frequency, DC-link voltage reference, duty cycle of clamping carrier modulator, phase shift of the clamping carrier modulator relative to the grid, and optimizing the balance in the operating junction temperatures and/or power losses across the active switches and the total losses of the voltage source converter as a function of the adjustment of these operating parameters until reaching optimum operation parameters for the control scheme. | 11-29-2012 |
20120307533 | 3-LEVEL PULSE WIDTH MODULATION INVERTER WITH SNUBBER CIRCUIT - The present invention relates to a circuit arrangement which comprises at least one 3-level pulse width modulation inverter with a snubber circuit. The snubber circuit is formed by at least one coil (L), two capacitors (Cu, Co) and a series connection comprising four diodes (Dh | 12-06-2012 |
20130039100 | POWER CONVERTING APPARATUS - A power converter for effectively reducing switching noise is provided. The power converter comprises a capacitor | 02-14-2013 |
20130070491 | INTERFACE ARRANGEMENT BETWEEN AC AND DC SYSTEMS INCLUDING FILTER AT TRANSFORMER NEUTRAL POINT - An interface arrangement is provided for coupling between an AC system and a DC system. The arrangement includes a converter for conversion between AC and DC and having a DC side and an AC side, a transformer having a primary side with primary windings for coupling to the AC system and a secondary side with secondary windings coupled to the converter, where the secondary windings are coupled to ground via a neutral point of the secondary side, and a filter with filter elements set for removing a frequency component of at three times the fundamental frequency of an AC voltage appearing on the AC side of the converter. The filter is connected between the neutral point of the secondary side of the transformer and ground. | 03-21-2013 |
20130279216 | COMPENSATING RIPPLE ON PULSE WITH MODULATOR OUTPUTS - A ripple compensation apparatus comprises a ripple detection unit to detect a ripple on a dual DC bus, a waveform generation unit to generate a modulated waveform based on a base waveform and the detected ripple, and a multi-phase control signal generation unit to receive the modulated waveform and to generate at least one pulse width modulated control signal based on the modulated waveform. | 10-24-2013 |
20140119069 | HIGH POWER CONTROL SYSTEM AND CONTROL METHOD THEREOF - A high power control system includes: a single energy source; an energy source management unit configured to manage the energy source; a controller configured to output a PWM control signal under control of the energy source management unit; a plurality of inverters configured to convert a direct current into an alternating current under control of the PWM control signal of the controller; a plurality of filters coupled to output terminals of the inverters; and a plurality of switches configured to regulate connections between the filters and a load under control of a regulation control signal of the controller. | 05-01-2014 |
20140146585 | SYSTEM AND METHOD FOR POWER CONVERSION - A power converter is provided. The power converter includes a converter leg including switches for converting power. The power converter also includes a controller for switching the switches using a pulse width modulation technique. The power converter further includes an interface inductor coupled to the converter leg for avoiding a reverse recovery of current in the switches during operation. | 05-29-2014 |
20140192568 | Inverter for a Distributed Power Generator - Provided is a maximum power point (MPP) tracker for a PV cell inverter, and a PV cell inverter. The MPP tracker decouples output power oscillations from the input power generation and extracts maximum available power from the PV cell. The PV cell inverter uses the MPP tracker and generates a sinusoidal output current from the MPP tracker output. The sinusoidal output current may be fed to a power distribution grid. The PV cell inverter may use a pulse width modulation technique to cancel harmonics in the sinusoidal output current. The circuits use a minimum number of components and avoid use of large electrolytic capacitors. | 07-10-2014 |
20140211522 | APPARATUS AND METHOD FOR CONTROLLING CIRCULATING CURRENT IN AN INVERTER SYSTEM - A power conversion system is disclosed that provides multiphase power, including phase voltages for each phase of the multiphase power. The system comprises a plurality of inverters that generate PWM output voltages based on PWM control signals. A plurality of inductive components is configured to receive the PWM output voltages to generate the phase voltages. The PWM output voltages cause circulating current flows through the inductive components. A voltage controller is employed that is responsive to the phase voltages to generate voltage modulation signals corresponding to the phase voltages. A plurality of current sharing channels are respectively associated with each of the plurality of inductive components and are configured generate current sharing modulation signals in response to the circulating current flows. The PWM control signals are generated based on modulation signals obtained by combining the current sharing modulation signals and voltage modulation signals. | 07-31-2014 |
20140328092 | INVERTER DEVICE AND INVERTER GENERATOR - An inverter device includes a voltage command value output unit that outputs a voltage command value, voltage sensors that detect output voltage from a switching circuit, a Fourier transform unit that performs frequency analysis on the output voltage detected by the respective voltage sensors, and a voltage correction value calculation unit that obtains harmonics with respect to a drive frequency of the switching circuit subjected to the frequency analysis by the Fourier transform unit and obtains a voltage correction coefficients for correcting the voltage command value so as to cancel the harmonics. The voltage correction value calculation unit calculates coefficients each for each degree of the harmonics and determines whether the coefficients converges when calculating the coefficients so as to obtain the voltage correction coefficients based on the coefficients which are determined to converge. | 11-06-2014 |
20140369090 | INVERTER APPARATUS - In an inverter apparatus, an output voltage of an active filter circuit that steps up and smoothes a DC voltage is converted into an AC voltage by an inverter circuit. The active filter circuit includes a capacitor and a rectifier device connected between an input node and an output node. An inductor, one end of which is connected to the input node and the other end of which is connected the output node through the rectifier device, and a switch device connected between the other end and a low-potential-side line, and a first control circuit for the switch device are provided. The inductor stores energy while the switch device is on and releases the energy while the switch device is off. The rectifier device conducts such that the stored energy of the inductor is released. | 12-18-2014 |
20150043254 | GRID FEED APPARATUS, ENERGY FEED SYSTEM AND METHOD FOR OPERATING A GRID FEED APPARATUS - The invention relates to a network feed device ( | 02-12-2015 |
20150070948 | VIRTUAL OSCILLATOR CONTROL OF POWER ELECTRONICS INVERTERS - A system includes power electronics inverters connected in a network. The power electronics inverters can utilize measurements at local terminals, without a need to exchange information between other power electronics inverters. | 03-12-2015 |
20150124498 | POWER CONVERSION DEVICE - A power converter includes a first arm configured by connecting a diode to a switching element, a second arm configured by connecting a diode to another switching element, a third arm formed of a first bidirectional switch configured by connecting switch elements, and a fourth arm formed of a second bidirectional switch configured by connecting other switch elements. An inverter circuit is configured by connecting the first and second arms in series between terminals of a direct current power source circuit, by connecting the third arm between a terminal of an alternating current power source and an output terminal, and by connecting the fourth arm between the output terminal and another output terminal. The control mode of the inverter circuit is switched between control modes at a timing at which at least one common arm continues a conductible condition. | 05-07-2015 |
20150357938 | POWER CONVERTER - A power converter fixes, in one cycle of an alternating-current voltage output command, a gate pulse signal to always output a direct-current input positive side terminal voltage value of an inverter circuit in a period X | 12-10-2015 |
20160028301 | RESONANCE SUPPRESSION DEVICE - The present invention whose object is to reduce compensation current at the time when suppressing harmonic distortion caused by harmonic voltage, to reduce capacitance of an inverter, a resonance suppression device configured to suppress resonance which occurs when a power facility such as a wind power generator is connected to a power system includes: an inverter configured to supply alternating current to the power system, the inverter being in parallel with the power facility; a current command value generation unit in which voltage at a connection point between the power facility and the power system is inputted thereto and a current command value is obtained by multiplying, by a transfer function, a harmonic component contained in the voltage at the connection point; and a current control unit configured to control the alternating current outputted from the inverter based on the current command value. | 01-28-2016 |
20160099661 | Method to Generate Multilevel Inverter Modulation Control Signals - A method generates space vector modulation signals for a multi-level power inverter using space vector pulse width modulation (SVPWM). A reference voltage and a triangle region for the reference voltage are determined. Vertices for a space vector that is closest to the reference voltage is outputted. Then, the vertices are adjusted so that the space vector is in a valid region of the triangle region. Lastly, the space vector modulation signals a, b, and c corresponding to the space vector in the valid region are outputed. | 04-07-2016 |
20160111951 | POWER CONVERSION DEVICE, CONTROL METHOD THEREOF, ROTATION SENSORLESS CONTROL DEVICE, AND CONTROL METHOD THEREOF - A power conversion device includes a carrier generating unit, a setting unit, a PWM signal generating unit, and a power conversion unit. The carrier generating unit generates a carrier of a particular set carrier frequency during a certain continuation time. The setting unit sets the continuation time to be random and sets one carrier frequency among a plurality of mutually-different carrier frequencies as the set carrier frequency. The PWM signal generating unit generates a PWM signal based on the carrier generated by the carrier generating unit. The power conversion unit executes a power conversion based on the PWM signal and supplies converted power to a load. | 04-21-2016 |
20190149034 | METHOD FOR OPERATING AN INVERTER SYSTEM AND INVERTER SYSTEM WORKING ACCORDING TO SAID METHOD | 05-16-2019 |
363042000 | Including notching | 3 |
20080298098 | Zero-current notch waveform for control of a three-phase, wye-connected H-bridge converter for powering a high-speed electric motor - A zero-current, synchronous switching waveform is provided for a three-phase, wye-connected H-Bridge to power an electric motor. The switching waveform includes two notches per cycle on the switching waveform provided to each of the semiconductor switches to minimize total harmonic distortion and switching loss. Positioning of the notch with respect to the zero-current crossing is optimized to reduce switching loss and minimize total harmonic distortion. | 12-04-2008 |
20110228574 | EMI REDUCTION CIRCUIT FOR ACTIVE PFC CONVERTER - The present invention provides a technical solution to reduce electromagnetic interference generated by a high-frequency switching electronic circuit. By adding a disturbance signal whose amplitude varies with time to the input pin of the active power factor correction module of the high frequency switching electronic circuit which is intended to receive an input power control signal, the switching frequency of the active power factor correction module varies with time, so that the electromagnetic interference energy is dispersed in a frequency domain and the electromagnetic interference is reduced. While the effect is even more apparent particularly when the power supply of the high-frequency switching electronic circuit is a DC power source. | 09-22-2011 |
20220140750 | SYSTEMS AND METHODS FOR INCREASING EFFICIENCY OF A POWER CONVERTER - Systems and methods for increasing the efficiency of inverters are provided. In some embodiments, an inverter may be configured to connect to a direct current power source and output alternating current power. The inverter may include one or more transistors configured to receive a direct current signal and output a pulse width modulated signal having a particular switching frequency or spread spectrum frequencies. The inverter also includes a low pass filter having multiple elements where each of the multiple elements have parasitic characteristics. One or more of the multiple elements may be designed such that the frequency response has a notch or a minimum at the switching frequency while having a desired cutoff frequency. | 05-05-2022 |