Plural Inverters Patents (Class 363/71)
  • Patent number: 10734919
    Abstract: An electric transformer circuit for connecting electrical equipment, such as a renewable energy-based generator or an energy storage system, to an electric grid. The circuit includes a first voltage converter connected to the equipment; a transformer connected to the first converter and a second voltage converter connected to the transformer and the electric grid. The transformer is a weakly coupled transformer, the magnetic coupling between the first coil and the second coil being less than 0.7. The transformer includes a first and second capacitor respectively associated with a first and second coil so as to form, with the corresponding coil, a circuit resonating at frequency f0. The electric transformer circuit can be included in an electric installation.
    Type: Grant
    Filed: June 27, 2018
    Date of Patent: August 4, 2020
    Assignee: SCHNEIDER ELECTRIC INDUSTRIES SAS
    Inventor: Yann Herriot
  • Patent number: 10720844
    Abstract: A power supply control device for supplying electricity to a plurality of loads includes: a plurality of synchronous rectification type DC-DC converters, each regulating and supplying the power source to the load; a plurality of reference voltage circuits, each outputting a reference voltage; a common reference voltage circuit outputting a common reference voltage; a plurality of comparison circuits, each outputting a signal that corresponds to the difference between a feedback voltage, which is a fraction of the output voltage from the DC-DC converter, and the reference voltage or the common reference voltage; and a common reference voltage circuit controller controlling the common reference voltage circuit so that the common reference voltage falls when the input to the comparison circuit is switched from the reference voltage to the common reference voltage.
    Type: Grant
    Filed: January 24, 2019
    Date of Patent: July 21, 2020
    Assignee: FANUC CORPORATION
    Inventor: Jun Okamoto
  • Patent number: 10651656
    Abstract: A control system and method include a control strategy and a UDE (Uncertainty and Disturbance Estimator)-based controller incorporated into the control strategy to achieve proportional load sharing for parallel-operated inverters. The UDE-based controller regulates the reactive power against the output generated by a reactive power reference unit according to the load voltage to generate the amplitude of the control voltage. The conventional droop method regulates real power to generate the phase of the control voltage. As a result, the model uncertainties (e.g., parameter drifts and uncertain output impedance), and system disturbances (e.g., fluctuating DC-link voltage and load change) can be estimated and compensated for accurate load sharing.
    Type: Grant
    Filed: September 8, 2017
    Date of Patent: May 12, 2020
    Assignee: Texas Tech University System
    Inventors: Beibei Ren, Yeqin Wang, Qing-Chang Zhong
  • Patent number: 10622913
    Abstract: A modular cell for a phase leg of a Modular Multilevel power Converter (MMC) is disclosed. The cell includes a power storing device, a plurality of semiconductor switches, a cell controller, and a current sensor. The current sensor is connected between a current conducting line in the cell and the cell controller for measuring a current through the cell and signaling information about the measured current to the cell controller. The cell controller includes an optical communication interface and is configured for forwarding the information about the measured current to a higher level controller over the optical communication interface.
    Type: Grant
    Filed: June 1, 2016
    Date of Patent: April 14, 2020
    Assignee: ABB Schweiz AG
    Inventors: Beat Buchmann, Simon Herold
  • Patent number: 10608752
    Abstract: A modular multilevel converter has a plurality of sub-modules, each of which includes at least two electronic switching elements and an electrical energy storage device. The sub-modules are controlled by a control device. An optical output of the control device of the converter is connected to an input of an optical distributor by way of a first optical waveguide. A plurality of outputs of the optical distributor are individually connected to an optical input of one of the sub-modules, respectively, by way of a second optical waveguide.
    Type: Grant
    Filed: January 19, 2016
    Date of Patent: March 31, 2020
    Assignee: Siemens Aktiengesellschaft
    Inventors: Rodrigo Alonso Alvarez Valenzuela, Joerg Dorn, Dominik Ergin, Herbert Gambach, Martin Pieschel, Frank Schremmer
  • Patent number: 10566894
    Abstract: A three-phase alternating-current power supply compatible electrically driven hoisting machine having a three-phase alternating-current input terminal, a three-phase rectifier circuit, a direct-current circuit, an inverter, and a three-phase alternating-current motor is changed into a single-phase alternating-current power supply compatible electrically driven hoisting machine by attaching a single-phase AC-DC converter unit having a single-phase alternating-current input terminal, a single-phase AC-DC converter, and a direct-current circuit to the three-phase alternating-current power supply compatible electrically driven hoisting machine and connecting the P and N electrodes of a direct-current output terminal of the single-phase AC-DC converter unit to the P and N electrodes of the direct-current circuit, respectively, and further open-circuiting the three-phase alternating-current input terminal.
    Type: Grant
    Filed: December 8, 2017
    Date of Patent: February 18, 2020
    Assignee: KITO CORPORATION
    Inventor: Tadashi Yamano
  • Patent number: 10536001
    Abstract: A photovoltaic system includes photovoltaic cells, inverters, a reduced electricity output state determiner which determines whether each of the photovoltaic cells is in a reduced electricity output state, a first command value generator which generates a first command value for decreasing a first power factor of a first inverter determined as in the reduced electricity output state, a second command value generator which generates a second command value for increasing a second power factor of at least one of second inverters so as to compensate for output power of the first inverter, and a controller which controls the inverters.
    Type: Grant
    Filed: November 11, 2016
    Date of Patent: January 14, 2020
    Assignee: Toshiba Mitsubishi-Electric Industrial Systems Corporation
    Inventors: Yuji Matsuoka, Tatsuaki Ambo, Naoki Fujiwara, Paul Bixel, Ryuta Saka
  • Patent number: 10516271
    Abstract: A single-phase Energy Utilization Tracker (EUT) inverter that comprises two DC/AC conversion modules. At any time, the two modules combined can sequentially extract and convert most the power provided by a DC energy source into two AC power (voltage) trains. The first AC power (voltage) train conforms to the power grid convention; while the second AC power train has a 90 degree phase difference to the specific power line pair. In according to the principle described herein, this single-phase EUT inverter further comprising a phase adjuster to adjust the phase of the second AC power (voltage) train by 90 degrees to become synchronous with the first AC power train; both AC power trains being then suitable to deliver into the same power line.
    Type: Grant
    Filed: June 29, 2018
    Date of Patent: December 24, 2019
    Assignee: LT LIGHTING (TAIWAN) CORP.
    Inventor: Geoffrey Wen-Tai Shuy
  • Patent number: 10483889
    Abstract: A frequency of an AC voltage of an AC grid present at a genset is defined by an UPS. The frequency is altered in one direction away from a desired frequency, if a power demand increases beyond a power supply in the AC grid, and in the other direction, if the power demand falls below the power supply. An alteration of the frequency in the one direction is limited to a maximum value in that missing power is temporarily fed out of an energy storage of the UPS into the AC grid. A shift of the frequency in the one direction is kept until no more power flows out of the energy storage. The genset responds to deviations of the frequency of the AC voltage from the desired frequency in the one and the other direction by an increase and a decrease of supplied genset power, respectively.
    Type: Grant
    Filed: November 16, 2017
    Date of Patent: November 19, 2019
    Assignee: PILLER GROUP GMBH
    Inventor: Frank Herbener
  • Patent number: 10431989
    Abstract: A low voltage, low frequency multi-level power converter capable of power conversion is disclosed. The power converter may include a low voltage, low frequency circuit that includes a plurality of phase-shifting inverters in series; a plurality of low voltage source inputs, and a plurality of phase-shifting inverters in series. Each of the plurality of phase-shifting inverters may be configured to receive at least one of the plurality of low voltage source inputs; and generate at least one square wave output. A semi-sine wave output may be derived from the generated at least one square wave output.
    Type: Grant
    Filed: January 17, 2017
    Date of Patent: October 1, 2019
    Assignee: JABIL INC.
    Inventors: Salman Talebi Rafsanjan, David Michael Eckerson
  • Patent number: 10411758
    Abstract: According to an aspect of the present invention, a drive control system is provided that includes a transmitting apparatus and a plurality of drive control apparatuses and drives and controls a plurality of devices to be controlled, wherein the transmitting apparatus includes: a control information addition apparatus that frequency-multiplexes a plurality of control signals, and an electric wire that supplies power and the plurality of control signals to the plurality of drive control apparatuses.
    Type: Grant
    Filed: August 26, 2015
    Date of Patent: September 10, 2019
    Assignee: OSAKA CITY UNIVERSITY
    Inventor: Hiroaki Tsujimoto
  • Patent number: 10396683
    Abstract: A Modular Multilevel Converter (MMC) includes multiple sub-modules connected in series with each other and a controller for controlling on/off switching of the sub-modules, in which the multiple sub-modules include N sub-modules that participate in the operation of the MMC and M redundant sub-modules for replacing at least one N sub-modules when the at least one N sub-modules fail, and the controller switches on a sub-module if a carrier signal assigned thereto is higher than a preset reference signal, and switches off the sub-module if the carrier signal assigned thereto is lower than the preset reference signal.
    Type: Grant
    Filed: December 28, 2015
    Date of Patent: August 27, 2019
    Assignee: HYOSUNG HEAVY INDSTRIES CORPORATION
    Inventors: Hong-Ju Jung, Jong-Yun Choi, June-Sung Kim, Jung-Soo Park, Doo-Young Lee
  • Patent number: 10381950
    Abstract: A wireless charger for an electric vehicle and a resonant inverter comprising a resonant portion that serially connects to a phase shifting portion and serially connects with a load component and a method for controlling a resonant inverter having multiple phase shifts, comprising operating the frequency of the resonant inverter close to the resonant frequency of the inverter through the full operation range of the resonant inverter; and adjusting phase shifts to control the output power of the resonant inverter.
    Type: Grant
    Filed: February 18, 2015
    Date of Patent: August 13, 2019
    Assignee: New York University
    Inventors: Mariusz Bojarski, Dariusz Czarkowski, Francisco De Leon
  • Patent number: 10374531
    Abstract: The purpose of the present invention is not only to reduce ripple current but also to improve operation efficiency by reducing heat generation. When n is defined as an integer of 2 or more, a motor control device of the present invention drives n sets of windings by n sets of inverters. The motor control device is characterized in that when said n sets of inverters output high power, at least one or more of said n sets of inverters are set to have an output duty cycle of 100%.
    Type: Grant
    Filed: May 11, 2015
    Date of Patent: August 6, 2019
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Nobuyasu Kanekawa, Ryoichi Kobayashi, Tomonobu Koseki, Takuro Kanazawa
  • Patent number: 10348217
    Abstract: Systems and methods are disclosed with multiple direct current (DC) voltage source inverters to supply power to an alternating current (AC) power system.
    Type: Grant
    Filed: November 13, 2015
    Date of Patent: July 9, 2019
    Assignee: Sungrow Power Supply Co., Ltd.
    Inventors: Milan Ilic, Mika Nuotio
  • Patent number: 10340699
    Abstract: [Problem] It is intended to provide a system, a related method and a minimum current detection and control system for, even when partial shading occurs in a string composed of a series connection of a plurality of solar cell modules, maintaining an output current of the whole. [Solution] By inputting an output voltage of the string into an inverter to convert the output voltage into an AC voltage and applying the AC voltage to the string via a multi-stage voltage multiplier rectification circuit, a compensation current is supplied to a shaded module on a priority basis to maintain an output current of the whole string while lowering an operating voltage of the shaded module by impedance generated on a pathway of the compensation current.
    Type: Grant
    Filed: September 11, 2014
    Date of Patent: July 2, 2019
    Assignee: Japan Aerospace Exploration Agency
    Inventors: Masatoshi Uno, Akio Kukita
  • Patent number: 10291111
    Abstract: A system and method includes parallel power converters, at least one current sensor, and a first feedback control circuit. A first power converter is configured to convert a first input power to a first output power, and is controlled using pulse width modulation having a first switching period. One or more second power converters are connected in parallel with the first power converter and configured to convert a second input power to a second output power. The first output power and the second output power are provided to a load. The at least one current sensor is positioned to sense first output current of the first output power, and the first feedback control circuit is configured to calculate a first metric based on the first sensed current at each of a plurality of first edges of each half switching period of the first switching period, and at intermediate points between each of the plurality of first edges.
    Type: Grant
    Filed: March 23, 2018
    Date of Patent: May 14, 2019
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Sebastian Rosado, Virgilio Valdivia Guerrero, Laura Albiol-Tendillo
  • Patent number: 10284094
    Abstract: A circuit configured to, for each of values of output currents output from power conversion devices connected in parallel to one another and driven based on common ON signals applied to the power conversion devices, output a difference between the output current value and a reference value when a polarity of the output current value is positive, and output a difference between an absolute value of the output current value and an absolute value of the reference value when the polarity of the output current value is negative; and a circuit configured to output adjustment time signals each of which indicates an amount of a delay time of a rising timing or a falling timing of the ON signal, according to an output value of the output current difference calculation circuit.
    Type: Grant
    Filed: March 7, 2018
    Date of Patent: May 7, 2019
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Infrastructure Systems & Solutions Corporation
    Inventors: Suzuo Saito, Akihisa Matsushita, Yoichi Morishima
  • Patent number: 10250234
    Abstract: Measures, including apparatus, methods and computer program products, for generating an output signal with a defined waveform shape are provided. A plurality of switched inductor arrangements are each connected in parallel to generate a combined output signal. Each of the switched inductor arrangements are selectively enabled, wherein the number of enabled switched inductor arrangements is varied to define a waveform shape of the combined output signal.
    Type: Grant
    Filed: June 25, 2015
    Date of Patent: April 2, 2019
    Assignee: ARM Limited
    Inventor: David Pietromonaco
  • Patent number: 10243447
    Abstract: A controller controls power between a source and a load with a link capacitor. (a) A switch vector is selected based on load and source values, a capacitor voltage value, and a switch state selection mode. The switch vector identifies an on or off configuration for load and source switches during a subcycle that allow or do not allow current flow between the link capacitor and the load switch or source switch. (b) The state of the load and source switches is controlled in the on configuration or in the off configuration based on the selected switch vector. (c) It is determined that it is time to select a next switch vector. (a) to (c) are repeated for each subcycle of the determined number of switching subcycles. At least one load switch and at least one source switch are simultaneously in the on configuration during at least one subcycle.
    Type: Grant
    Filed: February 2, 2017
    Date of Patent: March 26, 2019
    Assignee: WISCONSIN ALUMNI RESEARCH FOUNDATION
    Inventors: Venkata Giri Venkataramanan, Mahima Gupta
  • Patent number: 10230242
    Abstract: In the present legacy electrical power generation and distribution system, the power quality delivered to end consumers is being degraded by a number of disruptive technologies and legislative impacts; especially with the rapidly increasing myriad of privately owned and operated domestic and commercial distributed energy generation (DEG) devices connected at any point across a low voltage (LV) distribution network. The present invention bypasses this increasing critical DEG problem by offering a solution comprising an energy processing unit (EPU) that is installed at the customer's electrical power point of use (POU). And because of the controlled tightly voltage regulated output of the EPU, significant energy savings can be achieved through dynamic voltage control, utilizing the CVR effect, reduced reactive power demand, and reduced or eliminated peak demand billings.
    Type: Grant
    Filed: October 17, 2016
    Date of Patent: March 12, 2019
    Assignee: Edge Electrons Limited
    Inventors: Neal George Stewart, Gordon Currie, Jian Zapata, Richard McIndoe
  • Patent number: 10205403
    Abstract: A cascaded H-bridge inverter and a method for handling a fault thereof are provided. An output voltage or an output power of each of N solar panels is detected by a controller. In a case that the output voltage of at least one of the N solar panels is lower than a preset voltage, or that the output power of at least one of the N solar panels is lower than a preset power, the controller controls a corresponding switching device to be switched off, and changes a set value of a voltage across a capacitor in the direct current side. Then, the controller controls a corresponding H-bridge module to perform inverting by taking the set value of the voltage across the capacitor in the direct current side as an input value, so that a total output modulation voltage of the cascaded H-bridge inverter meets a preset condition.
    Type: Grant
    Filed: March 27, 2017
    Date of Patent: February 12, 2019
    Assignee: SUNGROW POWER SUPPLY CO., LTD.
    Inventors: Jun Xu, Yilei Gu
  • Patent number: 10139800
    Abstract: Decentralized methods for computing optimal real and reactive power setpoints for residential photovoltaic (PV) inverters are described. Optimal power flow techniques are described that select which inverters will provide ancillary services and compute their optimal real and reactive power setpoints according to specified performance criteria and economic objectives.
    Type: Grant
    Filed: March 4, 2016
    Date of Patent: November 27, 2018
    Assignee: Regents of the University of Minnesota
    Inventors: Sairaj Dhople, Georgios B. Giannakis, Emiliano Dall'Anese
  • Patent number: 10116234
    Abstract: A DC/AC converter is provided with a new control device and method for managing inrush current transients during operation without requiring additional external devices or emergency operating modes forcing the DC/AC converter to shut down. The present invention is particularly, but not exclusively, aimed at grid connected DC/AC, converters, often subject to inrush current phenomena due to perturbations in the grid.
    Type: Grant
    Filed: December 21, 2016
    Date of Patent: October 30, 2018
    Assignee: ABB Schweiz AG
    Inventors: Pietro Raboni, David Martini, Silvia Mastellone, Stefan Almer
  • Patent number: 10075057
    Abstract: A hybrid topology power converter includes a three-level circuit module and a cascaded H-bridge circuit module. A control method includes the following steps. Firstly, a zero sequence component is injected into a total modulation wave, thereby generating a compensated total modulation wave. Then, a first voltage signal is generated according to the compensated total modulation wave. An H-bridge modulation wave is generated according to the compensated total modulation wave and the first voltage signal. A three-level driving signal is generated according to the first voltage signal, and an H-bridge driving signal is generated according to the H-bridge modulation wave. A duty cycle of at least one switch element of the three-level circuit module is adjusted according to the three-level driving signal. A duty cycle of at least one switch elements of the cascaded H-bridge circuit module is adjusted according to the H-bridge driving signal.
    Type: Grant
    Filed: April 26, 2017
    Date of Patent: September 11, 2018
    Assignee: DELTA ELECTRONICS (SHANGHAI) CO., LTD.
    Inventors: Dingkun Shen, Jianfei Zheng, Wei Xu, Jianping Ying, Lan Wei, Zhiming Hu
  • Patent number: 10050552
    Abstract: A high-frequency isolation alternating/direct current conversion circuit and a control method thereof are disclosed. The conversion circuit includes an alternating current source, a direct current source, a resonant capacitor, a high-voltage energy-storage filter, a high-frequency inverter bridge, a drive circuit, a resonant inductor, a high-frequency isolation transformer, a direct current side synchronous switch, a control circuit, and the like. The conversion circuit is made to be switched between two working modes, a rectification mode and an inversion mode by using a preset direct current source reference voltage as a reference, according to an external voltage reference, and by using different turn-on working modes of the high-frequency inverter bridge.
    Type: Grant
    Filed: August 30, 2017
    Date of Patent: August 14, 2018
    Assignee: SHENZHEN BOYN ELECTRIC CO., LTD.
    Inventors: Lunquan Li, Jiajian Liu, Sha Yan
  • Patent number: 9985523
    Abstract: A DC-DC converter includes first and second converters. The first converter generates a first power voltage based on a power voltage from an input terminal, and outputs the first power voltage to a first output terminal. The second converter generates a second power voltage based on the input power voltage, and outputs the second power voltage to a second output terminal. The second converter includes a plurality of inverting converters and a controller. The inverting converters generate a check current to check a connection state of an inductor when the inductor is connected. The second power voltage is generated by converting the input power voltage in response to a PWM signal. The controller generates a driving control signal based on the check current to operate a predetermined number of the inverting converters connected to the inductor, and to control the inverting converters based on the driving control signal.
    Type: Grant
    Filed: February 2, 2015
    Date of Patent: May 29, 2018
    Assignee: Samsung Display Co., Ltd.
    Inventor: Sung-Chun Park
  • Patent number: 9954393
    Abstract: A power distribution system is described. The system includes a main ac busbar and an emergency ac busbar. A hybrid drive system includes an induction electrical machine and a prime mover, the rotor of the electrical machine and the driving end of the prime mover being mechanically coupled to a load by means of a mechanical linkage such as a gearbox. The system includes a first active rectifier/inverter having ac input terminals electrically connected to the main ac busbar, and dc output terminals. The system includes a second active rectifier/inverter having dc input terminals electrically connected to the dc output of the first active rectifier/inverter by a dc link, and ac output terminals electrically connected to the induction electrical machine. A blackout restart system includes a rectifier having ac input terminals selectively electrically connectable to the emergency ac busbar and dc output terminals selectively electrically connectable to the dc link.
    Type: Grant
    Filed: April 22, 2016
    Date of Patent: April 24, 2018
    Assignee: GE ENERGY POWER CONVERSION TECHNOLOGY LIMITED
    Inventors: Teng Long, Stephen Wood, Ushindibaba Mupambireyi
  • Patent number: 9941800
    Abstract: The disclosed embodiments provide a system that operates switched-mode power supplies, such as flyback converters. The power supplies may comprise isolated or non-isolated power converters. During operation, the system senses an on-time of a primary switch in the power converter. Upon detecting that the on-time does not exceed an on-time threshold within a first pre-specified period that spans one or more switching cycles, the system extends the on-time during a subsequent switching cycle to at least meet the on-time threshold. The system may then measure the voltage on one or more reference windings of the power converter during the on-time of the subsequent switching cycle, wherein the reference winding may comprise, e.g., an auxiliary winding of the primary winding of the power converter or a secondary winding of the power converter (e.g., in the case of isolated power converters utilizing a transformer).
    Type: Grant
    Filed: September 2, 2015
    Date of Patent: April 10, 2018
    Assignee: Apple Inc.
    Inventors: Juan Carlos Pastrana, Manisha P. Pandya, Sameer G. Kelkar, Nicholas A. Sims
  • Patent number: 9923446
    Abstract: A method of controlling a multilevel converter, a computer program and a controller for a converter is provided. The method includes determining a transition voltage from a control period to a following control period, analyzing the switching cells of each phase leg, selecting capacitors to provide the transition voltage and synthesize the output voltage for the following control period, and connecting the selected capacitors during the following control period. The analyzing of each switching cell includes analyzing a first switching leg and a second switching leg of the switching cell. The method includes determining whether a change of state of the first switching leg would contribute to the direction of the transition voltage, and determining whether a change of state of the second switching leg would contribute to the direction of the transition voltage, and determining the internal conditions of each of the first and the second switching leg that are determined as contributing to the transition.
    Type: Grant
    Filed: August 11, 2014
    Date of Patent: March 20, 2018
    Assignee: ABB SCHWEIZ AG
    Inventors: Christopher Townsend, Hector Zelaya De La Parra
  • Patent number: 9893528
    Abstract: A method of controlling voltage balancing of a modular multi-level converter is provided. The method includes receiving state information on each of n sub modules in an arm module, grouping the n sub modules into m sub module groups, receiving first state information on each of sub modules in a first one of the m sub module groups, among the state information on each of the n sum modules, receiving second state information on each of sub modules not included in the first sub module group, among state information on each of the n sum modules previously stored in a memory, controlling switching of a sub module by using the first state information and the second state information, and updating the memory with the first state information.
    Type: Grant
    Filed: March 22, 2016
    Date of Patent: February 13, 2018
    Assignee: LSIS CO., LTD
    Inventor: Gum Tae Son
  • Patent number: 9887666
    Abstract: The present invention discloses a junction box for a solar cell. The junction box includes a box body, wherein the box body is provided with a plurality of conducting pieces for connecting solar cell pieces; two adjacent conducting pieces are connected by a diode; the conducting pieces at both ends are connected to the outside parts via a guide line respectively; and the forward dissipation power of the diode in the middle is less than that of the diodes at both sides. According to the invention, the diode with lower forward dissipation power is employed in parts where the temperature rise is easily produced to reduce the temperature rise; while the diode with higher forward dissipation power is employed in parts where the temperature rise is not easily produced to control cost.
    Type: Grant
    Filed: November 14, 2016
    Date of Patent: February 6, 2018
    Assignee: ZHEJIANG RENHE PHOTOVOLTAIC TECHNOLOGY CO., LTD.
    Inventor: Lijun Duan
  • Patent number: 9866098
    Abstract: A photovoltaic power generation system, having a photovoltaic panel, which has a direct current (DC) output and a micro-inverter with input terminals and output terminals. The input terminals are adapted for connection to the DC output. The micro-inverter is configured for converting an input DC power received at the input terminals to an output alternating current (AC) power at the output terminals. A bypass current path between the output terminals may be adapted for passing current produced externally to the micro-inverter. The micro-inverter is configured to output an alternating current voltage significantly less than a grid voltage.
    Type: Grant
    Filed: June 12, 2014
    Date of Patent: January 9, 2018
    Assignee: Solaredge Technologies Ltd.
    Inventors: Ilan Yoscovich, Meir Gazit, Tzachi Glovinsky, Yoav Galin
  • Patent number: 9853571
    Abstract: The present invention discloses a secondary control method and apparatus of parallel inverters in a micro grid, comprising: generating frequency and amplitude of fundamental voltage in the voltage instruction of inverter by droop control according to output voltage and output current of inverter to obtain a fundamental voltage instruction value; extracting voltage values and current values of a first and second AC signals from output voltage and output current of inverter, generating frequency instruction values of the first and second AC signals by droop control to obtain voltage instruction values of the first and second AC signals; regulating the output voltage of inverter according to the voltage instruction value of the first AC signal, the voltage instruction value of the second AC signal and the fundamental voltage instruction value.
    Type: Grant
    Filed: March 7, 2017
    Date of Patent: December 26, 2017
    Assignee: DELTA ELECTRONICS (SHANGHAI) CO., LTD.
    Inventors: Jinjun Liu, Teng Wu, Zeng Liu, Shike Wang, Baojin Liu, Yong Tao
  • Patent number: 9853574
    Abstract: A voltage source converter including a DC terminal for connection to a DC electrical network, and a converter limb operatively connected to the DC terminal. The converter limb including at least one limb portion operatively connected to an AC terminal. The limb portion including a valve, the valve including at least one module, the module including at least one switching element and at least one energy storage device, the switching element and each energy storage device in the module combining to selectively provide a voltage source. A controller including a valve voltage demand sub-controller. The controller being configured to provide AC and DC output voltage demands to the valve voltage demand sub-controller. And, a switching control unit configured to control switching of the switching element in the module so as to generate a voltage across the valve.
    Type: Grant
    Filed: October 14, 2014
    Date of Patent: December 26, 2017
    Assignee: GENERAL ELECTRIC TECHNOLOGY GMBH
    Inventor: Colin Donald Murray Oates
  • Patent number: 9847751
    Abstract: Techniques for optimizing power production from photo-voltaic systems using, e.g., inductive coupling, are provided. In one aspect, a method of optimizing photo-voltaic generated power from a string of photo-voltaic devices is provided. The method includes the step of: providing corrective power to at least one photovoltaic device in the string of photo-voltaic devices to boost performance of the at least one photovoltaic device and thereby increase overall the photo-voltaic generated power from the string of photo-voltaic devices, wherein the corrective power is from about 1% to about 5%, and ranges therebetween, of the photo-voltaic generated power from the string of photo-voltaic devices. A system for optimizing photo-voltaic generated power from a string of photo-voltaic devices and a method for use thereof are also provided.
    Type: Grant
    Filed: July 30, 2014
    Date of Patent: December 19, 2017
    Assignee: International Business Machines Corporation
    Inventors: Peter D. Kirchner, Yves C. Martin, Theodore G. van Kessel
  • Patent number: 9843274
    Abstract: A three-level photovoltaic inverter pulse width modulation method and a three-level photovoltaic inverter pulse width modulator. The method includes: when it is detected that potential safety hazards exist in a three-level photovoltaic inverter, switching the pulse width modulation mode of the three-level photovoltaic inverter into a 13-vector space vector pulse width modulation mode, to solve the fault or abnormal problems in the three-level photovoltaic inverter such as midpoint potential offset or excessively large common mode leakage current formed when the ground stray capacitance of a photovoltaic assembly is large, wherein according to the 13-vector SVPWM mode, 12 short vectors in 27 on-off state vectors of the three-level photovoltaic inverter are abandoned, and only six long vectors, six middle vectors and three zero vectors are reserved.
    Type: Grant
    Filed: May 8, 2015
    Date of Patent: December 12, 2017
    Assignee: SUNGROW POWER SUPPLY CO., LTD.
    Inventors: Xiaoxun Li, Zhiqiang Han, Haoyuan Li, Xiaodong Mei, Benhe Yang, Kai Shen
  • Patent number: 9843272
    Abstract: A power converter includes 2n charge storage elements connected in series in this order, n being a natural number of 2 or more, a first switch element and a first diode connected in series in this order between terminals of a first charge storage element, a second diode and a second switch element connected in series in this order between terminals of a 2nth charge storage element, a third diode and a fourth diode connected in series in this order between terminals of each of the second charge storage element to a 2n?1th charge storage element, 2n leads each connected to a node between the first switch element and the first diode, a node between the third diode and the fourth diode, and a node between the second diode and the second switch element, and 2n?1 switch circuits for selecting one of outputs output to the 2n leads.
    Type: Grant
    Filed: February 19, 2014
    Date of Patent: December 12, 2017
    Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventor: Shinzo Tamai
  • Patent number: 9819279
    Abstract: An AC voltage regulator that regulates the output AC voltage level regardless of the varying AC input voltage utilizing high frequency series inductors that only process a proportion of the total output power and uses unipolar semiconductor low loss switches in series with one or more rectifiers.
    Type: Grant
    Filed: April 11, 2016
    Date of Patent: November 14, 2017
    Assignee: EDGE ELECTRONS LIMITED
    Inventors: Neal George Stewart, Wing Ling Cheng
  • Patent number: 9809118
    Abstract: A system and a method for parallel power supply control for auxiliary converters of a motor train unit in the presence of interconnecting lines. The system comprises multiple three-phase inverter modules. The multiple three-phase inverter modules are in parallel connection with each other. Any two-phase circuit of a three-phase inverter module is separately in parallel connection with a corresponding two-phase circuit of a three-phase inverter module adjacent to the three-phase inverter module by using a connecting line module. The connecting line module is connected to a control system. The three-phase inverter modules are also connected to the control system. The three-phase lines of the three-phase inverter modules are all provided with switches.
    Type: Grant
    Filed: June 9, 2014
    Date of Patent: November 7, 2017
    Assignee: CRRC QINGDAO SIFANG ROLLING STOCK RESEARCH INSTITUTE CO., LTD.
    Inventors: Dongjun Yang, Bo Li, Junlei Wei, Bo Zhang, Zhaoping Li, Xiaoming Zhang, Zheng Xie, Yang Zhou, Lijun Zhang, Yanfang Zhang
  • Patent number: 9807863
    Abstract: A RF amplifier is provided that includes a plurality of switch modules connected in a cascade configuration and divided into disjoint sets in accordance with their corresponding distinct peak DC voltages or currents, each switch module including a plurality of switch devices connected in a half-bridge or full-bridge circuit and a DC voltage or current source electrically connected with the half-bridge or full-bridge circuit, and a control circuit configured to determine an output voltage or current of the RF amplifier at the next switching interval, examine the states of the switching devices in the respective switch modules to identify a combination of least-recently-switched switching devices within each set of switch modules that, when switched to an opposite state, will produce the determined output voltage or current, and switch to an opposite state, at the next switching interval, the switching devices in the identified combination.
    Type: Grant
    Filed: June 9, 2016
    Date of Patent: October 31, 2017
    Assignee: Advanced Energy Industries, Inc.
    Inventor: Gideon Van Zyl
  • Patent number: 9762146
    Abstract: A system for interconnecting parallel insulated gate bipolar transistor (IGBT) modules is provided. A pair of switches selected from a plurality of the IGBT modules are assigned to a driver integrated circuit (IC). In the pair of switches, a master IGBT switch is selected, the other switch being a slave IGBT switch. A command signal from the driver IC is electrically coupled to both the master and slave IGBT switches. The master and slave IGBT switches both have protective circuits; however, the driver IC is electrically coupled to the protective circuits of the selected master IGBT switch only. The protective circuits include temperature and current sense circuits. The plurality of the IGBT modules may be formed by two hexpack power modules. The modules are configured such that only a single driver IC is needed for each pair of parallel IGBT switches, with equal current sharing of the paralleled modules.
    Type: Grant
    Filed: October 30, 2015
    Date of Patent: September 12, 2017
    Assignee: FARADAY&FUTURE INC.
    Inventors: Steven E. Schulz, David Tang, Silva Hiti
  • Patent number: 9762141
    Abstract: A circuit for an electrical load comprises a passive transformer, the secondary of which is connected to power cells for each phase according to the transformer tappings. Each power cell comprises a low cost but efficient power factor correction circuit to produce lower harmonics on the transformer.
    Type: Grant
    Filed: March 3, 2014
    Date of Patent: September 12, 2017
    Assignee: NIDEC CONTROL TECHNIQUES LIMITED
    Inventor: Frank Weiner Heerdt
  • Patent number: 9762086
    Abstract: Disclosed are various embodiments of switchless power source redundancy in a power source transfer device providing power to one or more computing device(s). The power source transfer device includes a plurality of AC power converters configured to receive power from corresponding power sources. A first AC power converter provides DC power to a common DC bus of the power source transfer device. A second AC power converter provides DC power to the common DC bus in response to a change in a monitored level provided by the first AC power converter.
    Type: Grant
    Filed: December 28, 2010
    Date of Patent: September 12, 2017
    Assignee: AMAZON TECHNOLOGIES, INC.
    Inventors: Peter G. Ross, Richard A. Stevens
  • Patent number: 9744875
    Abstract: A battery comprises a number n of battery module strings, wherein n is a natural number greater than or equal to two. The battery module strings have several battery modules, and one battery module has a coupling unit. The coupling unit is configured as a voltage transformer and couples the battery modules to each other. A method of controlling the battery includes supplying a load connected to the battery with a predefined and substantially constant total power. The total power corresponds to a sum of n individual powers of the n battery module strings. The method further includes setting n?1 string voltages, which are each present at the n?1 battery module strings, according to the total power, the load, and by defining a string voltage present at an nth battery module string with amplitude and phase position. At least two of the n individual powers are asymmetrical to each other.
    Type: Grant
    Filed: December 11, 2012
    Date of Patent: August 29, 2017
    Assignee: Robert Bosch GmbH
    Inventors: Ralph Schmidt, Dirk Hasenkopf, Stefan Butzmann, Holger Fink
  • Patent number: 9742319
    Abstract: A current controller for an electric machine that includes an input, an output, a threshold generator and a comparator. The threshold generator stores a scaling factor and includes a PWM module that operates on a reference voltage to generate a threshold voltage. The duty cycle of the PWM module is then defined by the scaling factor. The comparator compares a voltage at the input against the threshold voltage and causes an overcurrent signal to be generated at the output when the voltage at the input exceeds the threshold voltage.
    Type: Grant
    Filed: March 30, 2010
    Date of Patent: August 22, 2017
    Assignee: Dyson Technology Limited
    Inventors: John Dunstan Marvelly, Seth Alan Yates
  • Patent number: 9722423
    Abstract: We describe a modular adjustable power factor renewable energy inverter system. The system comprises a plurality of inverter modules having a switched capacitor across its ac power output, a power measurement system coupled to a communication interface, and a power factor controller to control switching of the capacitor. A system controller receives power data from each inverter module, sums the net level of ac power from each inverter, determines a number of said capacitors to switch based on the sum, and sends control data to an appropriate number of the inverter modules to switch the determined number of capacitors into/out of said parallel connection across their respective ac power outputs.
    Type: Grant
    Filed: November 13, 2015
    Date of Patent: August 1, 2017
    Assignee: SOLARCITY CORPORATION
    Inventors: Paul Garrity, Aaron Michael Jungreis
  • Patent number: 9712084
    Abstract: An electric power conversion device includes a power conversion unit and a converter control unit. The power conversion unit includes three arms connected to an AC circuit. The converter control unit includes a phase DC voltage control unit, a negative sequence current command value calculation unit, an output current control unit, a circulating current control unit, a voltage command value calculation unit, and a gate signal generation unit, and imbalance of cell DC capacitor voltages among phases due to grid imbalance is controlled by circulating current and negative sequence current.
    Type: Grant
    Filed: July 2, 2014
    Date of Patent: July 18, 2017
    Assignees: Mitsubishi Electric Corporation, TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Takeshi Kikuchi, Kaho Mukunoki, Toshiyuki Fujii, Osamu Mori, Shinzo Tamai, Sadao Funahashi, Yasuhiko Hosokawa, Kotaro Higashi
  • Patent number: 9680390
    Abstract: A multi-source power supply for supplying power that includes a first rectifier configured to convert a first AC power signal from a first source to a first DC power signal, a second rectifier configured to convert a second AC power signal from a second source to a second DC power signal and a common bus operatively connected to the first rectifier and the second rectifier and configured to combine a the DC power signals into a combined DC power signal, where the common bus distributes the combined DC power signal to at least one server.
    Type: Grant
    Filed: March 14, 2014
    Date of Patent: June 13, 2017
    Assignee: Twitter, Inc.
    Inventors: Jeffrey Rose, Paul Thies, Jennifer Fraser
  • Patent number: 9620993
    Abstract: An auto-synchronous isolated inlet power converter is disclosed that can be daisy-chained with other power converters and/or an alternating current (AC) power source. The power converter automatically generates output AC power that is in parallel with external input AC power coming into the power converter when the power converter senses the external input AC power so that the power converter operates as a slave in this state. The power converter automatically generates output AC power when the power converter fails to detect the external input AC power coming into the power converter where the power converter operates as a master in this state. The power converter generates the output AC power without any reliance on the external input AC power generated by a utility grid and/or other AC power sources external to the power converter.
    Type: Grant
    Filed: April 29, 2014
    Date of Patent: April 11, 2017
    Assignee: Solpad, Inc.
    Inventor: Christopher A. Estes