By Pulse Modulation Technique (e.g., Pwm, Ppm, Etc.) Patents (Class 363/41)
  • Patent number: 11177658
    Abstract: A method to reduce harmonics in the electrical output (i.e. voltage and current) of a power plant is provided. The power plant is connected via a point of common coupling with an electrical grid. Converters of the power plant provide respective electrical converter output by an applied pulse-width modulation scheme, which is used in the respective converter. The electrical output of the respective converters is summed to generate the electrical output of the power plant. The electrical output of the power plant is provided via the point of common coupling to the electrical grid. Carrier sideband harmonics, which are generated by the converters, are measured in the electrical output of the power plant. A carrier signal of at least one selected converter is adjusted in its phase until specified and characteristic harmonics in the electrical output of the power plant are reduced below a given threshold.
    Type: Grant
    Filed: January 30, 2018
    Date of Patent: November 16, 2021
    Inventors: Emerson Guest, Kim Hoej Jensen, Lei Shuai
  • Patent number: 11139730
    Abstract: A switching period in a burst cycle includes three pulses, that is to say, a start pulse that turns on a low-side switching element, a main pulse that turns on a high-side switching element, and an end pulse that turns on the low-side switching element. A burst stop period corresponding to the magnitude of a load is set during a switching stop period. When the burst cycle approaches a cycle corresponding to a frequency close to the upper limit of the audible frequencies, a second off-threshold voltage of the main pulse is made equal to a first off-threshold voltage of the start pulse to narrow the on-width of the main pulse. By doing so, energy transmitted to the secondary side of a transformer is reduced and the burst cycle is shortened.
    Type: Grant
    Filed: January 31, 2020
    Date of Patent: October 5, 2021
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventors: Koji Murata, Jian Chen
  • Patent number: 11128144
    Abstract: A grid access current control method without current sensor applicable to a grid-connected inverter relates to a system including a main circuit of the grid-connected inverter and a control circuit of the grid-connected inverter. The control circuit of the grid-connected inverter includes a grid access current open-loop control module and a PWM generation module; the grid access current open-loop control module includes a first proportional regulator, a second proportional regulator, a delayer, and an adder; input ends of the first proportional regulator and the second proportional regulator each are led out as an input end of a grid access current reference signal; and an output end of the first proportional regulator is connected to an input end of the adder; an output end of the second proportional regulator is connected to an input end of the delayer.
    Type: Grant
    Filed: October 17, 2018
    Date of Patent: September 21, 2021
    Assignee: SOUTHEAST UNIVERSITY
    Inventors: Huafeng Xiao, Zheng Wang, Ming Cheng
  • Patent number: 11090106
    Abstract: A controller for an electrosurgical generator includes an RF inverter, a signal processor, a software compensator, a hardware compensator, and an RF inverter controller. The RF inverter generates an electrosurgical waveform and the signal processor outputs a measured value of at least one of a voltage, a current, or power of the electrosurgical waveform. The software compensator generates a desired value for at least one of the voltage, the current, or the power of the electrosurgical waveform, and the hardware compensator generates a phase shift based on the measured value and the desired value. The RF inverter controller generates a pulse-width modulation (PWM) signal based on the phase shift to control the RF inverter.
    Type: Grant
    Filed: April 14, 2016
    Date of Patent: August 17, 2021
    Assignee: Covidien LP
    Inventors: Robert H. Wham, Donald L. Tonn, Aaron Mattmiller, William D. Faulkner, Edward L. Brannan, Mark A. Johnston
  • Patent number: 11088633
    Abstract: The present invention relates to a method for controlling a distortion spectrum that arises for a switch-based inverter (306), which modulates at least one output variable, by virtue of space vector modulation, characterized in that different switch positions (312) causing a modulation of the at least one output variable which approximates to a predefined reference signal (310), are ascertained for each chronologically sequential switching process, a respective distortion spectrum for differences between the reference signal (310) and the at least one output variable that would arise from a respective realization of these different switch positions (312) is calculated, and the switch position (314) for which the associated distortion spectrum is most suitable according to predetermined properties is selected and implemented in the inverter (306). Further provided are a corresponding system and a corresponding modulator.
    Type: Grant
    Filed: June 27, 2018
    Date of Patent: August 10, 2021
    Inventors: Stefan Goetz, Christian Korte
  • Patent number: 11056906
    Abstract: An integrated power supply system includes a grid power source, at least one renewable power source, a rechargeable battery assembly, a DC bus, a bi-directional AC-to-DC converter, at least one first DC-to-DC converter, a bi-directional DC-to-DC converter, and a controller. The bi-directional AC-to-DC converter is coupled to the grid power source and the DC bus. The at least one first DC-to-DC converter is coupled to the at least one renewable power source and the DC bus. The bi-directional DC-to-DC converter is coupled to the rechargeable battery assembly and the DC bus. The controller controls power electricity feeding into and being drawn from the DC bus, thereby keeping a bus voltage of the DC bus substantially fixed at a system voltage.
    Type: Grant
    Filed: June 21, 2018
    Date of Patent: July 6, 2021
    Assignee: DELTA ELECTRONICS, INC.
    Inventors: Yu-Ming Chang, Sheng-Hua Li
  • Patent number: 10998814
    Abstract: A power conversion system, a controller for the same, and a method for controlling the same. The power conversion system includes a shutdown array and a power converter. The shutdown array includes multiple shutdown strings that are connected in parallel. Each of the multiple shutdown strings includes multiple shutdown devices, where outputs of the multiple shutdown devices are connected in series. An output terminal of the shutdown array is connected to an input terminal of the power converter. An input terminal of each of the multiple shutdown devices is connected to at least one direct-current power supply. The controller sends a shutdown instruction to each shutdown device of the shutdown array in response to receiving a rapid-shutdown command, controls the power converter to discharge an input capacitor of the power converter, and stops discharging the input capacitor in response to an input voltage of the power converter being reduced to a preset voltage.
    Type: Grant
    Filed: February 21, 2020
    Date of Patent: May 4, 2021
    Assignee: SUNGROW POWER SUPPLY CO., LTD.
    Inventors: Zongjun Yang, Hua Ni, Xiaoxun Li, Haifeng Yang
  • Patent number: 10992218
    Abstract: A harmonic suppression device includes a power converter that generates a harmonic suppression current that is an electric current for suppressing a harmonic current flowing in a power line and outputs the generated harmonic suppression current to the power line, a communication unit that exchanges signals with other harmonic suppression devices, and a controller that controls the power converter based on a signal received by the communication unit.
    Type: Grant
    Filed: February 2, 2017
    Date of Patent: April 27, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kenji Iwazaki, Koichi Arisawa
  • Patent number: 10953751
    Abstract: A vehicle-side circuit for supplying power in an electrically driven vehicle is provided. The power circuit includes an external AC voltage terminal; at least one DC/AC converter having an AC voltage side; and an electrical machine having a plurality of windings, each of which has a first tapping. The electrical machine is connected to the AC voltage side of the DC/AC converter. A switching device is connected to the plurality of windings and to a signal shaping filter having a plurality of first capacitors. The signal shaping filter is connected between the DC/AC converter and an external AC terminal. The switching device may interconnect the windings within the electrical machine or may connect the first tappings of the plurality of windings within the signal shaping filter to the plurality of first capacitors to form an at least third-order low-pass filter.
    Type: Grant
    Filed: March 23, 2018
    Date of Patent: March 23, 2021
    Assignee: Vitesco Technologies GmbH
    Inventors: Franz Pfeilschifter, Martin Brüll, Wilhelm Hackmann, Klaus Mühlbauer, Martin Spornraft, Matthias Töns
  • Patent number: 10944326
    Abstract: A method for autonomous systems comprising the steps of using a feedback circuit to provide power to an autonomous system, wherein the feedback circuit is configured to alternate between a first and second sources of power depending on availability of power; creating a delay in the circuit by electrically coupling the circuit to a comparator, a one-shot signal, and a low pass filter, wherein the delay is configured to last for a specified amount of time, and wherein the delay will prevent the power from uncontrolled back and forth oscillation between the first and second power sources.
    Type: Grant
    Filed: August 8, 2018
    Date of Patent: March 9, 2021
    Assignee: United States of America as represented by the Secretary of the Navy
    Inventors: Alex G. Phipps, Everly Yeo, Victor Saucedo, Frank Alonge, Rennie Andrews
  • Patent number: 10938296
    Abstract: Techniques are described for ripple detection and cancellation in switching voltage regulator circuits. For example, in a switching voltage converter, a voltage is up-converted or down-converted by switching high side and low side switches and passed through a low-pass filter for averaging. While the act of switching can result in conversion of the voltage with good efficiency, it also typically generates ripples on the output voltage, which can be undesirable in some applications. Embodiments use the switching voltage, the output voltage, and a feed-forward loop to generate a current cancellation signal to have particular gain, timing, and polarity that effectively emulates the complement of the inductor ripple current. The cancellation current signal can be injected into the output node, such that the cancellation current signal sums with the inductor ripple current at the output node, thereby at least partially cancelling the effect of the inductor ripple current.
    Type: Grant
    Filed: February 14, 2020
    Date of Patent: March 2, 2021
    Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.
    Inventors: Siavash Yazdi, Ahmed Emira
  • Patent number: 10923906
    Abstract: A fault switch configuration and clearing method in a flexible DC converter station, the flexible DC converter station is configured with a grid side switch and a valve side phase-split switch in the converter station. When a fault occurs, a faulty phase and a non-faulty phase are detected and identified by means of differential protection or low voltage overcurrent. An alternating current zero crossing condition is created by means of firstly turn off the non-faulty phase valve side phase-split switch and the grid side switch, thereby cutting off the faulty phase, disconnecting the connection between a power supply and a fault point, and achieving the clearing for faults. The described fault-clearing method is simple and practical, highly reliable, and connection between the fault point and the power supply is quickly and effectively cut; converter station equipment is effectively protected, and further expansion of the fault is avoided.
    Type: Grant
    Filed: May 22, 2018
    Date of Patent: February 16, 2021
    Assignees: NR ELECTRIC CO., LTD., NR ENGINEERING CO., LTD.
    Inventors: Yu Lu, Gang Li, Jie Tian, Nannan Wang, Haiying Li, Chongxue Jiang, Shunke Sui
  • Patent number: 10910955
    Abstract: The present disclosure provides a single carrier based multilevel modulation method, a single carrier based multilevel modulation device, and a storage medium. In each control period, a modulated wave value corresponding to each of n switch pairs is obtained according to a reference voltage to obtain n modulated wave values, a triangular carrier having an amplitude of n is generated and compared with each of the n modulated wave values to obtain control signals for each of the n switch pairs, and for each phase, the control signals are input to the corresponding switch pairs of the phase bridge.
    Type: Grant
    Filed: October 15, 2019
    Date of Patent: February 2, 2021
    Assignee: TSINGHUA UNIVERSITY
    Inventors: Kui Wang, Zedong Zheng, Yongdong Li
  • Patent number: 10826401
    Abstract: Input AC voltage sensing for a flyback circuit. The flyback circuit is configured as “primary-high”, namely a primary switch of the flyback circuit is positioned “high” to receive an input AC voltage through a first rectifying circuit. A primary winding of the flyback circuit is coupled to a primary ground reference. A voltage sensing circuit has a processing circuit and a first sensing resistor. The processing circuit has a first terminal coupled to the input AC source through a second rectifying circuit, a second terminal coupled to the primary ground reference and an output terminal. The processing circuit subtracts a voltage at the second terminal from a voltage at the first terminal to obtain a differential voltage, which is then sampled and held as an input AC voltage sensing signal.
    Type: Grant
    Filed: January 23, 2019
    Date of Patent: November 3, 2020
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Siran Wang
  • Patent number: 10756641
    Abstract: A switch mode power supply and method for operating the power supply and to the use of the same, wherein the switch mode power supply comprises a control for controlling a control element and is connected to a DC link of the converter, the switch mode power supply comprises a startup-delay such that control of the switch element is blocked until a predetermined start delay duration (T) has lapsed, where the start delay duration (T) is longer than the time span between DC link charging.
    Type: Grant
    Filed: May 15, 2012
    Date of Patent: August 25, 2020
    Assignee: Siemens Aktiengesellschaft
    Inventors: Daniel Portisch, Hans Drescher
  • Patent number: 10715065
    Abstract: A wind power generation system including a doubly fed induction generator (DFIG) of a wind turbine is presented. The DFIG includes a rotor and a stator, a rotor-side conversion unit coupled to the rotor, a direct current (DC) link, and at least one line-side conversion unit coupled to the rotor-side conversion unit via the DC link and coupled to the stator of the DFIG. The at least one line-side conversion unit includes exactly one first converter, high frequency transformers, and second converters, where each of the second converters is coupled to the first converter via a respective high frequency transformer, and inverters, where each of the inverters is coupled to a respective second converter and includes an alternative current (AC) phase terminal.
    Type: Grant
    Filed: December 8, 2017
    Date of Patent: July 14, 2020
    Assignee: General Electric Company
    Inventors: Kapil Jha, Arvind Kumar Tiwari, Saurabh Shukla, Olive Ray
  • Patent number: 10715034
    Abstract: Apparatus and system for powering an isolated gate driver. In one embodiment, the apparatus comprises a gate driver power supply unit (PSU), coupled to a transistor and to an isolated gate driver that couples control signals to the transistor, for (i) harnessing energy from commutation action across the transistor, and (ii) using the harnessed energy to power the isolated gate driver.
    Type: Grant
    Filed: January 20, 2016
    Date of Patent: July 14, 2020
    Assignee: Enphase Energy, Inc.
    Inventor: Michael J. Harrison
  • Patent number: 10714936
    Abstract: A system interconnecting facility is connected to a power system, and includes a plurality of power converters connected to the power system, a plurality of transformers provided between the power system and the power converters, a plurality of switches provided between the transformers and the power converters, and a controller that controls the opening and closing of the switch. The controller outputs, to the switches, open and close commands in so that the number of closed switches is out of a closed switch number range where a harmonic voltage of the system interconnecting facility increases, based on a harmonic voltage containing rate characteristic that is a relation between the number of closed switches and a harmonic voltage containing rate of the system interconnecting facility. The system interconnecting facility is capable of suppressing a harmonic voltage even if a circuit structure differs depending on a situation.
    Type: Grant
    Filed: February 25, 2016
    Date of Patent: July 14, 2020
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Energy Systems & Solutions Corporation
    Inventors: Masayuki Kubota, Tsutomu Tanno, Mami Mizutani, Shinya Naoi, Masako Kiuchi, Midori Otsuki, Kazuyoshi Shimada
  • Patent number: 10692675
    Abstract: The disclosure relates to a contactor having electronic coil control for a magnet coil, the operation of keeping the pull-in power of the magnet coil constant being formed by current clocking, and having a safety-related output assembly of a programmable logic controller for the fault diagnosis of the contactor, the safety-related output assembly determining the flow of current flowing into the contactor and detecting a fault if a limit value is undershot and switching off. In the contactor disclosed herein, a connectable base load is integrated in the contactor.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: June 23, 2020
    Assignee: Siemens Aktiengesellschaft
    Inventors: Christian Oppermann, Bernhard Streich
  • Patent number: 10630203
    Abstract: This bidirectional power conversion system for a single-phase electric load is intended to be connected to a continuous supply bus delivering a single supply voltage and deliver to the load an alternating output voltage substantially in a cradle form. It includes a set of intertwined converters able to jointly deliver a control voltage whose phase shift of its fundamental component with respect to the output voltage is intended to control the transfer of power between converters and the load, said converters being controlled in such a way that the amplitude of the average value of the control voltage corresponds to the amplitude of the alternating output voltage and in such a way that said control voltage has amplitudes capable of reducing the fluctuations of a current flowing between the voltage converters and the load.
    Type: Grant
    Filed: October 25, 2016
    Date of Patent: April 21, 2020
    Assignee: GE ENERGY POWER CONVERSION TECHNOLOGY LIMITED
    Inventor: Nicolas Lapassat
  • Patent number: 10630204
    Abstract: A network feedback unit feeds electrical energy from a voltage intermediate circuit into a three-phase network. The network feedback unit has: a buck converter unit having first and second buck converters, the first buck and second buck converters being connected in parallel with the input side of each electrically coupled to the voltage intermediate circuit; an inverter, with the input side electrically coupled to an output of the buck converter unit and the output side electrically coupled to the three-phase network; at least one filter capacitor arranged at the output of the buck converter unit or at the output of the inverter; and a controller unit to drive the first and second buck converter depending on a filter capacitor current such that the first and second buck converter contribute in equal parts to an output current of the buck converter unit.
    Type: Grant
    Filed: October 28, 2016
    Date of Patent: April 21, 2020
    Assignee: Schmidhauser AG
    Inventors: Christof Schneggenburger, Dirk Schekulin
  • Patent number: 10608524
    Abstract: Techniques are described for ripple detection and cancellation in switching voltage regulator circuits. For example, in a switching voltage converter, a voltage is up-converted or down-converted by switching high side and low side switches and passed through a low-pass filter for averaging. While the act of switching can result in conversion of the voltage with good efficiency, it also typically generates ripples on the output voltage, which can be undesirable in some applications. Embodiments use the switching voltage, the output voltage, and a feed-forward loop to generate a current cancellation signal to have particular gain, timing, and polarity that effectively emulates the complement of the inductor ripple current. The cancellation current signal can be injected into the output node, such that the cancellation current signal sums with the inductor ripple current at the output node, thereby at least partially cancelling the effect of the inductor ripple current.
    Type: Grant
    Filed: April 23, 2019
    Date of Patent: March 31, 2020
    Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.
    Inventors: Siavash Yazdi, Ahmed Emira
  • Patent number: 10582962
    Abstract: A dual-output generator is configured to output two or more waveforms at different frequencies. In particular, the dual-output generator is configured to provide low-frequency output, which may be suitable for ultrasonic surgical instruments, and a high-frequency output, which may be suitable for electrosurgical instruments, while reducing the amplitude of all remaining frequencies other than the two selected low and high frequencies to about zero.
    Type: Grant
    Filed: January 23, 2016
    Date of Patent: March 10, 2020
    Assignee: Covidien LP
    Inventors: Daniel A. Friedrichs, Chongwen Zhao, Bradford C. Trento, Daniel J. Costinett
  • Patent number: 10554113
    Abstract: A control system of a low voltage DC-DC converter is provided. The system includes a low voltage DC-DC converter unit that has a power semiconductor element and converts power supplied from a high voltage battery of a vehicle into power of low voltage. A switching frequency change unit changes a switching frequency of the power semiconductor element and a microcomputer generates a final PWM signal based on an input voltage value input from the high voltage battery and an output voltage value of the switching frequency change unit to apply a maximum duty command voltage to a PWM controller. The PWM controller applies PWM voltage to the power semiconductor element to thus operate the power semiconductor element at less than a maximum duty based on the maximum duty command voltage applied from the microcomputer.
    Type: Grant
    Filed: May 8, 2019
    Date of Patent: February 4, 2020
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Jee Heon Kim, Ho Joong Lee, Han Shin Youn, Dong Jun Lee, Hye Seung Kim
  • Patent number: 10528687
    Abstract: Virtual oscillator control systems, devices, and techniques are provided. One example device includes a processor configured to implement a virtual oscillator circuit and output an oscillating waveform based on the virtual oscillator circuit and power electronics operatively coupled to the processor and configured to convert, based on the oscillating waveform, direct current (DC) electricity to alternating current (AC) electricity. The processor may be further configured to extract, from the virtual oscillator circuit, a virtual current based on an output current of the AC electricity, and output the oscillating waveform further based on an input voltage of the DC electricity.
    Type: Grant
    Filed: April 28, 2017
    Date of Patent: January 7, 2020
    Assignees: Alliance for Sustainable Energy, LLC, ETH Zürich
    Inventors: Brian Benjamin Johnson, Nathan Ainsworth, Sairaj Vijaykumar Dhople, Mohit Sinha, Florian Anton Dörfler
  • Patent number: 10530239
    Abstract: A motor controller and methods for operating a motor are described herein. The motor controller includes a high-frequency (HF) inverter having a direct current (DC) input stage and an alternating current (AC) output stage, the HF inverter operable at a switching frequency to generate a three-phase output having a fundamental frequency. The motor controller also includes a differential mode (DM) filter coupled in series with the output stage of the HF inverter and having a resonant frequency less than 10% of the switching frequency, the DM filter configured to reduce harmonic components of the three-phase output and generate a first filtered output. The motor controller further includes a common mode (CM) filter coupled in series with the DM filter, the CM filter configured to filter the first filtered output to generate a second filtered output having a reduced CM voltage to operate the electric motor with a reduced bearing current.
    Type: Grant
    Filed: March 5, 2018
    Date of Patent: January 7, 2020
    Assignee: Regal Beloit America, Inc.
    Inventors: Ming Li, Roger Carlos Becerra
  • Patent number: 10486536
    Abstract: An electric vehicle control device includes: a main transformer to convert AC voltage input to an input winding thereof from an AC power source, and output converted AC voltage from each of a plurality of output windings; a plurality of converter main circuits, each connected to one of a plurality of secondary windings included in the output windings, to convert AC voltage output from connected secondary windings into DC voltage; and a plurality of converter controllers, each targeting for control one of the converter main circuits, to control by pulse width modulation the control-target converter main circuit, by comparing a signal wave and carrier wave. Each of the converter controllers determines a phase angle correction amount of the signal wave and/or the carrier wave, in response to operating state of a load supplied power through a predetermined output winding among the output windings.
    Type: Grant
    Filed: June 17, 2014
    Date of Patent: November 26, 2019
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventor: Tetsuo Sugahara
  • Patent number: 10461648
    Abstract: An alternating current step-down circuit comprises an AC input, a DC output, an AC output, a full-bridge rectification and filtering circuit, a flyback step-down circuit, a DC-DC step-down unit and an inverting unit. The AC input is connected with an input of the full-bridge rectification and filtering circuit; an output of the full-bridge rectification and filtering circuit is connected with an input of the flyback step-down circuit and an input of the DC-DC step-down unit, respectively; an output of the flyback step-down circuit is connected with the DC output, the input of the DC-DC step-down unit and an input of the inverting unit, respectively; an output of the DC-DC step-down unit is connected with the input of the inverting unit; and an output of the inverting unit is connected with the AC output.
    Type: Grant
    Filed: August 25, 2017
    Date of Patent: October 29, 2019
    Assignee: SHENZHEN SEGRE ELECTRONIC CO., LTD.
    Inventor: Wanglong Xiong
  • Patent number: 10454374
    Abstract: A power supply includes: a power converter that converts an input voltage by switching at a switch and supplies an output voltage and an output current to an output terminal connected to a load; a current detector that detects the output current or a current that changes with the output current and outputs a current detection signal whose voltage value changes with the output current; a signal corrector that inputs and corrects the current detection signal and generates and outputs a corrected current detection signal whose voltage value corresponds to the value of the output current; a matching circuit that inputs the corrected current detection signal and outputs to a balanced terminal; and a controller that inputs the corrected current detection signal and a balanced voltage signal generated at the balanced terminal and controls switching operations of the switch to reduce a difference between the two signals.
    Type: Grant
    Filed: September 20, 2018
    Date of Patent: October 22, 2019
    Assignee: TDK CORPORATION
    Inventors: Eiji Takegami, Tomokazu Ikarashi
  • Patent number: 10438530
    Abstract: A display interface circuit includes a first transistor and a second transistor electrically connecting in series between a first motherboard power and a display power. A first body diode of the first transistor has a current direction opposite a second body diode of the second transistor. When a display device powers up but a motherboard powers downs, a first control circuit turns on the first transistor and a second control circuit turns off the second transistor such that a current does not leak from the display power toward the first motherboard power due to the second body diode. When the display device powers down but the motherboard powers up, the first control circuit turns off the first transistor and the second control circuit turns off the second transistor such that the first motherboard power is not outputted to a video display interface due to the first body diode.
    Type: Grant
    Filed: December 29, 2017
    Date of Patent: October 8, 2019
    Assignee: Wistron Corporation
    Inventors: Ke Yang, Wei Liang Liao
  • Patent number: 10425032
    Abstract: A system and method for operating a drive system coupleable to one or more DC and AC electrical ports is disclosed. The drive system includes a DC link, at least one DC-DC converter, at least one DC-AC converter, a DC link capacitor, and a control system configured to control operation of one or more of the at least one DC-DC converter and the at least one DC-AC converter relative to one another based on operational parameters thereof. In controlling operation of one or more of the at least one DC-DC converter and the at least one DC-AC converter, the control system controls at least one of a switching frequency of the at least one DC-DC converter, a switching frequency of the at least one DC-AC converter, a DC-DC converter carrier signal phase, a DC-AC converter carrier signal phase, and a duty cycle of the at least one DC-DC converter.
    Type: Grant
    Filed: March 3, 2017
    Date of Patent: September 24, 2019
    Assignee: GENERAL ELECTRIC COMPANY
    Inventors: Nidhishri Tapadia, Kum-Kang Huh
  • Patent number: 10348190
    Abstract: Duties of control for DC/AC and DC/DC conversion units are determined by considering electric influences of a filter circuit, a capacitor connected to a DC bus, and a DC reactor for an output voltage command value for supplying an AC voltage to a load. The DC/DC conversion unit is controlled to convert a DC voltage into a DC bus voltage waveform alternately having a period of a pulsating current waveform corresponding to the absolute value of the AC voltage and a period of the DC voltage as a pulsating current minimum value. The DC/AC conversion unit is controlled to perform step-down operation during the period of the DC voltage and thus perform conversion into a waveform of the absolute value of the AC voltage corresponding to the period of the DC voltage, and also to perform polarity inversion per one pulsating current cycle.
    Type: Grant
    Filed: April 4, 2016
    Date of Patent: July 9, 2019
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Yusuke Shimizu, Tetsuo Akita, Toshiaki Okumura, Naoki Ayai
  • Patent number: 10331094
    Abstract: A periodic disturbance suppressing control apparatus is designed to estimate and correct an inverse model of a transfer characteristic of a real system successively even in case of large condition change in the real system, and to realize a stable control system. A periodic disturbance of an object to be suppressed is outputted as a sensed periodic disturbance ISdn, ISqn of a direct current component. A difference between a signal obtained by multiplication of the sensed periodic disturbance ISdn, ISqn with a multiplier using a reciprocal Qn of a transfer characteristic, and a signal obtained by adding only a detection delay to a periodic disturbance suppressing command I*dn, I*qn, to estimate the periodic disturbance dI^dn, dI^qn. Thee periodic disturbance suppressing command is calculated by calculating a deviation between the estimated periodic disturbance dI^dn, dI^qn.
    Type: Grant
    Filed: January 30, 2015
    Date of Patent: June 25, 2019
    Assignee: MEIDENSHA CORPORATION
    Inventor: Yugo Tadano
  • Patent number: 10326382
    Abstract: Disclosed is a phase-shifted square wave modulation technique for single-phase and three-phase IM2DC applications in HVDC/MVDC systems. A square wave based modulation waveform is applied to each cell of IM2DC and compared to the phase-shifted carrier waveforms to generate device gate signals. As a result, a higher equivalent switching frequency can be achieved, and square wave based arm and AC link waveforms will be generated. In addition, power flow of IM2DC can be controlled by a phase shift angle of the square modulation waveforms between HVS and LVS. The converter cell capacitors can be reduced in size because they are only required to smooth high switching frequency ripple components. In addition, lower TDR can be achieved due to the higher power transferring capability of square waves.
    Type: Grant
    Filed: October 16, 2018
    Date of Patent: June 18, 2019
    Assignee: The Florida State University Research Foundation
    Inventors: Hui Li, Ran Mo, Yanjun Shi
  • Patent number: 10305274
    Abstract: The present invention is concerned with pre-magnetizing a Modular Multilevel power Converters connected transformer in order to moderate inrush currents upon connecting the transformer to an electric grid. The invention takes advantage of the high amount of stored energy in MMC converters as compared to other converter types. This stored energy is used to pre-magnetize the converter-connected transformer, therefore no additional or dedicated pre-magnetizing hardware is required in addition to the charging hardware provided to charge the converter capacitors. As the transformer pre-magnetizing takes place subsequent to the converter charging, the converter charging circuit is not used to, and therefore does not need to be designed to, directly magnetize the transformer.
    Type: Grant
    Filed: April 17, 2017
    Date of Patent: May 28, 2019
    Inventor: Robert Turner
  • Patent number: 10270343
    Abstract: A multiphase power supply includes several constant ON-time (COT) DC-DC converter integrated circuits (ICs), with each COT DC-DC converter IC providing an output voltage of a phase of the multiphase power supply. The COT DC-DC converter ICs are sequentially turned ON one after another in interleaved fashion. A COT DC-DC converter IC receives a control signal at a take pin and, in response, turns ON its output switch. The COT DC-DC converter IC generates another control signal at a pass pin. The next COT DC-DC converter IC turns ON its output switch in response to receiving the other control signal from the previous COT DC-DC converter IC.
    Type: Grant
    Filed: September 8, 2015
    Date of Patent: April 23, 2019
    Assignee: Monolithic Power Systems, Inc.
    Inventors: James Nguyen, Yan Dong, Jinghai Zhou, Rohan Samsi
  • Patent number: 10263539
    Abstract: A power converter includes a transformation circuit configured to transform a rectified voltage, and a converter control unit configured to control a switching element of the transformation circuit. The converter control unit calculates a current command value based on a line voltage or the phase voltage, calculates a current deviation between the current command value and the reactor current, and calculates a switching command value from the current deviation. The converter control unit includes a plurality of integrators for the respective different phase angles of a power supply voltage. The integrator corresponding to a power supply phase angle is caused to accumulate the current deviation, and the integrator corresponding to a phase angle that is advanced by a set delay phase from the power supply phase angle is caused to output the control amount. A switching signal is generated with use of the control amount and the switching command value.
    Type: Grant
    Filed: October 1, 2015
    Date of Patent: April 16, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kenta Yuasa, Shuta Ishikawa, Akihiro Tsumura, Shinsaku Kusube
  • Patent number: 10193467
    Abstract: We describe a power conditioning unit with maximum power point tracking (MPPT) for a dc power source, in particular a photovoltaic panel. A power injection control block has a sense input coupled to an energy storage capacitor on a dc link and controls a dc-to-ac converter to control the injected mains power. The power injection control block tracks the maximum power point by measuring a signal on the dc link which depends on the power drawn from the dc power source, and thus there is no need to measure the dc voltage and current from the dc source. In embodiments the signal is a ripple voltage level and the power injection control block controls an amplitude of an ac current output such that an amount of power transferred to the grid mains is dependent on an amplitude of a sinusoidal voltage component on the energy storage capacitor.
    Type: Grant
    Filed: June 16, 2017
    Date of Patent: January 29, 2019
    Assignee: Tesla, Inc.
    Inventors: Lesley Chisenga, Gehan Anil Joseph Amaratunga, Cuauhtemoc Rodriguez
  • Patent number: 10186973
    Abstract: A multi-mode controller applied to a power converter includes a detection range generation module and a gate signal generation unit. The detection range generation module is used for generating a comparison voltage according to a reference current, and generating a detection signal according to the comparison voltage and a first reference voltage. When the detection signal is disabled by a zero-crossing signal, the gate signal generation unit generates a gate control signal corresponding to a quasi-resonant mode of the power converter according to the zero-crossing signal; and when the detection signal is disabled by a continuous-conduction mode signal generated by the detection range generation module according to the comparison voltage and a second reference voltage, the gate signal generation unit generates the gate control signal corresponding to a continuous-conduction mode of the power converter according to the continuous-conduction mode signal.
    Type: Grant
    Filed: January 4, 2017
    Date of Patent: January 22, 2019
    Assignee: Leadtrend Technology Corp.
    Inventors: Ming-Chang Tsou, Chih-Chi Chang
  • Patent number: 10177754
    Abstract: Disclosed herein are a method and an apparatus for generating a random PWM voltage reference signal for driving an inverter, which can more simply generate random position PWM (RPPWM) in which a position of an active vector is changed to achieve the same effect as when a switching frequency is changed.
    Type: Grant
    Filed: November 21, 2016
    Date of Patent: January 8, 2019
    Assignee: LSIS CO., LTD.
    Inventor: Jin-Kyu Yang
  • Patent number: 10033091
    Abstract: A circuit (4) for establishing a desired impedance value for a radio antenna (5) comprising a transistor (3) having an input (8) and an output terminal (6), and a printed radio frequency transformer comprising a first (1) and a second inductor (2), both inductors (1, 2) having a coupling factor value, and having a first and a second terminal (11, 12; 21, 22). The first terminal (11) of the first inductor (1) is adapted for connecting a radio antenna (5). The input terminal (8) of the transistor (3) is connected to the second terminal (12) of the first inductor (1), and the output terminal (6) of the transistor (3) is connected to the first terminal (21) of the second inductor (2), so that the desired impedance value (Z2) at the second terminal (22) of the second inductor (2) is determined by the inductance value of the second inductor (2).
    Type: Grant
    Filed: July 29, 2016
    Date of Patent: July 24, 2018
    Assignee: ADVANCED AUTOMOTIVE ANTENNAS, S.L.U.
    Inventors: Enrique Martinez Ortigosa, Ramiro Quintero Illera
  • Patent number: 10020765
    Abstract: A gas turbine power generation system is configured by a gas turbine, a main power generator which is coupled to a rotor of the gas turbine through a rotation shaft, a rotation rectifier which converts a three-phase AC current into a DC current and transfers the DC current to a field magnet winding wire of the main power generator, an AC exciter which is configured by an armature winding wire, a d-axis field magnet winding wire, and a q-axis field magnet winding wire, and transfers the three-phase AC current generated at the armature winding wire to the rotation rectifier, an excitation device which drives the AC exciter at the time of start-up of the main power generator, and an excitation power supply which supplies a current to the excitation device.
    Type: Grant
    Filed: December 30, 2015
    Date of Patent: July 10, 2018
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Michio Kataoka, Masaru Shimomura
  • Patent number: 9933828
    Abstract: Controlling power consumption of a voltage regulator in a computer system that includes computer memory and the voltage regulator is configured to provide regulated source voltage to the computer memory includes: receiving, by a voltage regulator controller, memory margin statistics of the computer memory, the memory margin statistics including data describing operational tolerance of the computer memory to source voltage signal variations; and adjusting, by the voltage regulator controller, one or more operating characteristics of the voltage regulator in dependence upon the memory margin statistics.
    Type: Grant
    Filed: August 19, 2014
    Date of Patent: April 3, 2018
    Assignee: Lenovo Enterprise Solutions (Singapore) Pte. Ltd.
    Inventors: Michael Decesaris, Luke D. Remis, Brian C. Totten
  • Patent number: 9923456
    Abstract: A matrix convertor includes a power convertor and a controller. The power convertor is disposed between a power system and a rotating electric machine, and includes a plurality of bidirectional switches. The controller is configured to control an exciting current flowing from the power convertor to the rotating electric machine so as to control a power factor on a side of the power system.
    Type: Grant
    Filed: July 3, 2015
    Date of Patent: March 20, 2018
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Wataru Yoshinaga, Takashi Tanaka, Kentaro Inomata, Kotaro Takeda, Takuya Naka
  • Patent number: 9923505
    Abstract: A system and method of controlling an electric motor using a motor drive controller are provided. The motor drive controller includes a rectifier configured to convert an AC input voltage to a DC voltage, a DC bus electrically coupled to the rectifier, an inverter electrically coupled to the DC bus and configured to generate an AC voltage to drive the electric motor, and a control unit. The control unit includes a sign calculation module configured to determine a polarity of each phase of a reference current command and a compensation module configured to generate a voltage compensation command signal using one of the determined polarities of the reference current command and a measured current, and one of a measurement of DC bus voltage and a constant DC bus voltage value, the voltage compensation signal compensating the drive controller to neutralize a deadtime effect.
    Type: Grant
    Filed: November 26, 2013
    Date of Patent: March 20, 2018
    Assignee: Regal Beloit America, Inc.
    Inventor: Yilcan Guzelgunler
  • Patent number: 9893668
    Abstract: Embodiments of the present invention relate to an a method, apparatus and computer program product for controlling the operation of a drive unit comprising a plurality of switching modules arranged to receive a DC electricity supply and generate an AC electricity supply for driving a load from the received DC electricity supply, the AC electricity supply being generated by the switching of the plurality of switching modules between a conducting state and a non-conducting state. The method comprises receiving one or more characteristics associated with each of the switching modules, comparing, for each switching module of the plurality of switching modules, a characteristic of the switching module with an equivalent characteristic associated with one or more other switching modules of the plurality of switching modules, and controlling a time period during which one or more of the plurality of switching modules are in the conducting state in accordance with a result of the comparison.
    Type: Grant
    Filed: July 19, 2013
    Date of Patent: February 13, 2018
    Assignee: NIDEC CONTROL TECHNIQUES LIMITED
    Inventors: Simon David Hart, Michael Cade, Richard Mark Wain
  • Patent number: 9882490
    Abstract: A power stage for a DC-to-DC voltage converter includes a voltage input, a high-side n-channel transistor, a high-side p-channel transistor, and a low-side n-channel transistor. The voltage input is couplable to a supply voltage. The drain terminal of the high-side n-channel transistor is coupled to the voltage input and the source terminal is coupled to a first node that is couplable to an output stage of the DC-to-DC converter. The source terminal of the high-side p-channel transistor is coupled to the voltage input and the drain terminal is coupled to the first node. The drain terminal of the low-side n-channel transistor is coupled to the first node and the source terminal is coupled to a ground.
    Type: Grant
    Filed: May 20, 2016
    Date of Patent: January 30, 2018
    Assignee: Texas Instruments Incorporated
    Inventors: Srinivas Venkata Veeramreddi, Murugesh Prashanth Subramaniam
  • Patent number: 9882485
    Abstract: Current metering for transitioning to low power operation in switching regulators is disclosed. In an exemplary embodiment, a method is provided that includes generating pulse width modulated charging cycles that enable current to flow to an inductor to adjust an output voltage, and detecting a skipped charging cycle. The method also includes determining whether a number of charging cycles are skipped over a time interval that begins when the skipped charging cycle is detected. The method also includes transitioning to a low power operating mode if it determined that the number of charging cycles have been skipped over the selected time interval. During the low power operating mode pulse frequency modulated charging cycles are generated that enable the current to flow to the inductor to generate the output voltage.
    Type: Grant
    Filed: December 31, 2016
    Date of Patent: January 30, 2018
    Assignee: Active-Semi, Inc.
    Inventors: Narasimhan Trichy, James Allen Kohout
  • Patent number: 9853447
    Abstract: Active droop current sharing among power supply units may regulate output currents of power supply units supplying shared current to a common load. The regulation may employ a combination of droop control and active current control. The shared current may be regulated such that each power supply unit provides a substantially equal share of the total current supplied. A current difference between two power supplies may be regulated to be within a desired maximum threshold for current difference.
    Type: Grant
    Filed: November 6, 2014
    Date of Patent: December 26, 2017
    Assignee: Dell Products L.P.
    Inventors: Tsai-Fu Hung, Shih-Chieh Wang, Yi-Chiao Hsu, Chung-Fu Lai
  • Patent number: 9831800
    Abstract: A self-balanced modulation method and a closed-loop magnetic flux rebalancing control method for parallel multilevel inverters. The combination of the two methods provides for balancing of the magnetic flux of the inter-cell transformers (ICTs) of the parallel multilevel inverters without deteriorating the quality of the output voltage. In various embodiments a parallel multi-level inverter modulator is provide including a multi-channel comparator to generate a multiplexed digitized ideal waveform for a parallel multi-level inverter and a finite state machine (FSM) module coupled to the parallel multi-channel comparator, the FSM module to receive the multiplexed digitized ideal waveform and to generate a pulse width modulated gate-drive signal for each switching device of the parallel multi-level inverter. The system and method provides for optimization of the output voltage spectrum without influence the magnetic balancing.
    Type: Grant
    Filed: October 19, 2016
    Date of Patent: November 28, 2017
    Assignee: The Florida State University Research Foundation, Inc.
    Inventors: Hui Li, Yanjun Shi