For Inverter Patents (Class 363/95)
  • Patent number: 10700540
    Abstract: A DC power supply system that limits the number of times of charging/discharging of the storage battery when a DC load is connected to a DC bus line. The system includes a DC bus line connectable to a DC load; a power generation device for supplying electric power to the DC bus line; a secondary battery for supplying electric power to the DC bus line; a DC-AC converter connected between the DC bus line and an AC power system; and a controller that controls power supply from the power generation device, the secondary battery, and the DC-AC converter to the DC bus line, and when the power supply of the power generation device cannot satisfy a power supply request of the DC load, the controller controls the DC-AC converter to supply electric power in preference to the secondary battery from the power system.
    Type: Grant
    Filed: September 7, 2018
    Date of Patent: June 30, 2020
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventors: Yuki Ishikura, Shuichi Tagawa
  • Patent number: 10673352
    Abstract: A power conversion apparatus includes: a plurality of cell blocks connected in cascade; and a plurality of bypass circuits each electrically connected in parallel with a corresponding one of the plurality of cell blocks. Each cell block includes: a first connection node on a high-potential side and a second connection node on a low-potential side for connection to another cell block; and a plurality of cell converters connected in cascade between the first connection node and the second connection node, each of the cell converters including an energy storage device. When a DC fault current flows in the direction from the low-potential side to the high-potential side, the current path via the plurality of cell blocks is larger in impedance than the current path via the plurality of bypass circuits.
    Type: Grant
    Filed: March 28, 2016
    Date of Patent: June 2, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kimiyuki Koyanagi, Ryosuke Uda
  • Patent number: 10658845
    Abstract: There is provided a system that includes a processor. The system also includes a memory that stores instructions; when executed by the processor, the instructions configure the processor to perform certain operations. The operations include receiving sensor measurements from an electric power source or device and generating, based on the sensor measurements, a droop control procedure that includes a droop control curve having a non-constant slope. The operations further include regulating a power delivery from the electric power source or device to a bus according to the droop control procedure.
    Type: Grant
    Filed: December 11, 2017
    Date of Patent: May 19, 2020
    Assignee: GE ENERGY POWER CONVERSION TECHNOLOGY LIMITED
    Inventor: Zhi Zhou
  • Patent number: 10637343
    Abstract: A power conversion device includes a plurality of leg circuits and a control device. The plurality of leg circuits correspond to respective phases of an AC circuit and connected in parallel between common first and second DC terminals. Each leg circuit includes a plurality of chopper cells each including an energy storage and cascaded to one another and at least one inductance connected in series to the plurality of chopper cells. The control device controls an operation of only at least one chopper cell included in each leg circuit based on a circulating current which circulates through the leg circuits.
    Type: Grant
    Filed: September 17, 2015
    Date of Patent: April 28, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Toshiyuki Fujii, Takushi Jimichi, Ryosuke Uda
  • Patent number: 10560025
    Abstract: A switching power converter is configured to control switching noise by implementing a plurality of pulse width modulation modes of operation. The peak current in each pulse width modulation mode of operation is controlled so that an output power for the switching power converter is continuous with regard to transitions between the pulse width modulation modes.
    Type: Grant
    Filed: March 13, 2018
    Date of Patent: February 11, 2020
    Assignee: DIALOG SEMICONDUCTOR INC.
    Inventors: John Shi, John Kesterson, Cong Zheng, Kai-Wen Chin
  • Patent number: 10560036
    Abstract: Each of a plurality of specified chopper cells which are some of a plurality of chopper cells included in each leg circuit in a power conversion device is configured as a full bridge. A control device controls operations of first and second switching elements of each specified chopper cell based on a circulating current which circulates through each leg circuit. The control device controls operations of third and fourth switching elements of each specified chopper cell based on a voltage of a capacitor of the specified chopper cell.
    Type: Grant
    Filed: September 17, 2015
    Date of Patent: February 11, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Toshiyuki Fujii, Takushi Jimichi, Ryosuke Uda
  • Patent number: 10527658
    Abstract: Disclosed embodiments relate to a power monitoring system that may include an external power supply source, an energy storage system, a renewable energy source and a distribution board. In some embodiments, the power monitoring system includes the renewable energy source, the energy storage system, the distribution board, a first power metering device, a second power metering device, a third power metering device, a fourth power metering device and a server.
    Type: Grant
    Filed: September 1, 2016
    Date of Patent: January 7, 2020
    Assignee: LSIS CO., LTD.
    Inventor: Sang-Ki Shon
  • Patent number: 10530284
    Abstract: This motor control device has an inexpensive configuration and enhances motor current target value tracking. This motor control device has an H bridge circuit that has a switching element and is connected to a motor coil provided in a motor, and a control means that drives the switching element at each prescribed PWM period and specifies an operation mode for the H bridge circuit from among a charge mode for increasing the motor current (Icoil) flowing through the motor coil, a fast decay mode for decreasing the motor current, and a slow decay mode.
    Type: Grant
    Filed: December 25, 2015
    Date of Patent: January 7, 2020
    Assignee: MINEBEA MITSUMI INC.
    Inventor: Hidetoshi Hijikata
  • Patent number: 10523006
    Abstract: The present application relates to a controller arrangement for controlling an inverter for converting an input power from a power source to a multiphase AC output power provided at a power output of the inverter. The power output is connected to a load and additionally to a power grid. The controller arrangement includes a signal input for receiving a power signal per phase representative of at least one of the power per phase provided to the load or the power per phase provided to the power grid. The controller arrangement is further adapted to control each phase of the multiphase AC output power individually according to the corresponding power signal. The invention further relates to an inverter comprising such a controller arrangement, a power distribution arrangement comprising such an inverter and a controller arrangement to control the inverter and the invention further relates to a method for controlling such an inverter.
    Type: Grant
    Filed: October 26, 2016
    Date of Patent: December 31, 2019
    Assignee: DELTA ELECTRONICS (THAILAND) PUBLIC CO., LTD.
    Inventors: Peter Wallmeier, Frank Schafmeister
  • Patent number: 10505437
    Abstract: A power converting device includes a DC-DC converting circuit, a DC-AC converting circuit, and an insulation detecting circuit. The DC-DC converting circuit is configured to convert a DC input voltage to a DC bus voltage. The DC-AC converting circuit is electrically coupled to the DC-DC converting circuit and configured to convert the DC bus voltage to an AC voltage. The insulation detecting circuit is electrically coupled between the DC-DC converting circuit and the DC-AC converting circuit. The insulation detecting circuit is configured to detect a ground impedance value of the power converting device according to the DC bus voltage.
    Type: Grant
    Filed: March 27, 2017
    Date of Patent: December 10, 2019
    Assignee: DELTA ELECTRONICS, INC.
    Inventors: Tsung-Han Tsai, Po-Jen Hou, Chen-Wei Ku, Xin-Hung Lin
  • Patent number: 10432187
    Abstract: A power supply device includes a power switch that is switched according to a gate voltage. A sense resistor receives a switch current that flows through the power switch to develop a sense voltage. A peak of a primary-side current is detected from the sense voltage. The gate driver has a pair of switches for generating the gate voltage in accordance with a control signal. When a low-side switch of the gate driver is turned on according to the control signal, the gate voltage of the power switch decreases as a sink current flows from the gate of the power switch via the transistor.
    Type: Grant
    Filed: September 28, 2017
    Date of Patent: October 1, 2019
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Taesung Kim, Seunguk Yang, Inki Park
  • Patent number: 10432189
    Abstract: Arrangement for controlling a voltage signal between gate and emitter terminals (G-E) of a switch type power semiconductor component, such as an IGBT transistor, such that the voltage signal is formed at least partly by means of a resistance and a switch (RGON1-SGON1, RGOFF1-SGOFF1) connected in series between an auxiliary voltage (+UG4, ?UG4) of a gate controller and the gate terminal (G) of the IGBT. The arrangement is adapted to control the switch (SGON1, SGOFF1) with a high frequency of at least 1 MHz and with a duty cycle adjusted such that the measured rate of change of a collector voltage of the IGBT being controlled is set in accordance with a reference value received from a control unit of the device.
    Type: Grant
    Filed: June 21, 2016
    Date of Patent: October 1, 2019
    Assignee: VACON OY
    Inventor: Pasi Voltti
  • Patent number: 10418908
    Abstract: A controller for use in a switched mode power converter includes a comparator coupled to compare an output sense signal representative of an output of the switched mode power converter to a target value. An update clock generator is coupled to generate a clock signal having a clock frequency in response to the output sense signal. A request control is coupled to generate a request signal having a request frequency in response to an output of the comparator and the clock signal to control an operational state of a power switch of the switched mode power converter. A speed at which the request control updates the request frequency of the request signal is responsive to the clock frequency of the clock signal.
    Type: Grant
    Filed: October 16, 2018
    Date of Patent: September 17, 2019
    Assignee: Power Integrations, Inc.
    Inventors: Tiziano Pastore, Sundaresan Sundararaj
  • Patent number: 10374506
    Abstract: An adaptive control method for zero voltage switching belongs to the field of integrated circuit. In the present invention, the difference between the turn-on time of the power tube and the time of the lowest drain voltage of the power tube in the switching cycle is quantified by the reversible counter, and the quantized result is transmitted to the next switching cycle to adjust the turn-on time of the power tube through the final count result of the reversible counter, so that the power tube after being adjusted can be turned on when the drain voltage of the power tube is the lowest, thus reducing the switching loss. The present invention can adaptively turn on the power tube when the drain voltage of the power tube reaches minimum, thus, realizing the zero-voltage switching, reducing the switching loss of the switching power supply, widening the application range.
    Type: Grant
    Filed: October 30, 2018
    Date of Patent: August 6, 2019
    Assignee: University of Electronics Science and Technology of China
    Inventors: Ze-kun Zhou, Jun-Lin Qian, Xiao-Lin Liu, Yue Shi, Zhuo Wang, Bo Zhang
  • Patent number: 10243472
    Abstract: Techniques are described to adjust the time when a switch is turned on from the time of one voltage valley to the time of another voltage valley for controlling an average load current or average load voltage. In some examples, the adjustment is instantaneous, and in some examples, the adjustment is gradual. Both of these example techniques provide for high switching efficiency of the switch.
    Type: Grant
    Filed: December 12, 2014
    Date of Patent: March 26, 2019
    Assignee: Infineon Technologies Austria AG
    Inventors: Marcus Schaemann, Josef Neulinger, Martin Krueger, Torsten Hinz
  • Patent number: 10205402
    Abstract: In a control device of a power conversion device, an AC control portion generates a first voltage command value representing an AC voltage component to be output from a plurality of chopper cells of each leg circuit. A DC control portion generates a second voltage command value representing a DC voltage component to be output from the plurality of chopper cells of each leg circuit. A circulating current control portion generates a third voltage command value to be output from the plurality of chopper cells of each leg circuit in order to suppress a circulating current. The circulating current control portion performs a non-linear operation with the first, second, and third voltage command values. The plurality of chopper cells of each leg circuit operate in accordance with a result of the non-linear operation.
    Type: Grant
    Filed: September 17, 2015
    Date of Patent: February 12, 2019
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Toshiyuki Fujii, Takushi Jimichi, Ryosuke Uda
  • Patent number: 10033189
    Abstract: An operation control apparatus includes a criterion calculator that obtains an operation criterion for the power converter, based on the voltage detected by the above voltage detector on the side of the alternating-current power system, a direct-current voltage detector that detects a direct-current output voltage of the solar battery, and an operation determination device that compares the direct-current output voltage detected by the direct-current voltage detector with the operation criterion obtained by the criterion calculator, and supplies the power converter with an operation command if the direct-current output voltage is greater than the operation criterion.
    Type: Grant
    Filed: December 6, 2013
    Date of Patent: July 24, 2018
    Assignee: Toshiba Mitsubishi-Electric Industrial Systems Corporation
    Inventor: Yosuke Fujii
  • Patent number: 10014686
    Abstract: Provided are a commutation control method and a commutation control apparatus. The method includes: detecting whether transient disturbance in a DC transmission system satisfies a disturbance criterion condition; when the transient disturbance satisfies the disturbance criterion condition, determining a maximum trigger delay angle used in a commutation operation performed by a current converter on an inverter side of the DC transmission system, the determined maximum trigger delay angle being smaller than a maximum trigger delay angle used before the transient disturbance; and controlling the current converter on the inverter side of the DC transmission system to perform the commutation operation based on the determined maximum trigger delay angle.
    Type: Grant
    Filed: September 29, 2015
    Date of Patent: July 3, 2018
    Assignee: NR ELECTRIC CO., LTD
    Inventors: Dongbin Lu, Yongping Wang, Zhenxi Wang, Junsheng Wang, Weiming Pan
  • Patent number: 9998029
    Abstract: According to one embodiment, an inverter including a detector which detects a value of an output voltage and a value of an output current; a command value input unit which is capable of receiving a current command value; a current command value compensating unit which, when the value of the output voltage detected by the detector is equal to or lower than a predetermined value, computes a compensation current value for compensating the current command value; an adder which adds the compensation current value to the current command value and outputs the compensated current command value; and a current controller which computes a voltage command value so that a difference between the compensated current command value and the output current detected by the detector becomes zero.
    Type: Grant
    Filed: May 30, 2017
    Date of Patent: June 12, 2018
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yuusuke Kouno, Yoichi Morishima
  • Patent number: 9985553
    Abstract: A control device (2) of an inverter converts electrical power generated by a solar cell (3) into alternating current power connecting to an electric power system (7). The control device includes: an alternating current voltage sensor (14) sensing a system voltage (Vr) of the electric power system; an MPPT executer (23) controlling a direct current voltage (Vdc) applied to the inverter (1) to cause the electrical power output from the solar cell (3) to be a maximum when the direct current voltage (Vdc) is higher than a lower limit (VL); a direct current voltage lower limit calculator 22 reducing the lower limit (VL) when the system voltage (Vr) is lower than a predetermined voltage; and an electrical power controller (25) controlling reactive power based on the system voltage (Vr), the reactive power being output from the inverter (1).
    Type: Grant
    Filed: January 13, 2015
    Date of Patent: May 29, 2018
    Assignee: TOSHIBA MITSUBISHI—ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Yuji Matsuoka, Tatsuaki Ambo
  • Patent number: 9917519
    Abstract: A switching power converter is configured to control switching noise by implementing a plurality of pulse width modulation modes of operation. The peak current in each pulse width modulation mode of operation is controlled so that an output power for the switching power converter is continuous with regard to transitions between the pulse width modulation modes.
    Type: Grant
    Filed: January 25, 2016
    Date of Patent: March 13, 2018
    Assignee: DIALOG SEMICONDUCTOR INC.
    Inventors: John Shi, John Kesterson, Cong Zheng, Kai-Wen Chin
  • Patent number: 9906036
    Abstract: A system and method for mapping relative positions of a plurality of alternative energy source modules. In one embodiment, the method includes injecting a first contribution current into a power grid by a first alternative energy source module of the plurality of alternative energy source modules and determining an output voltage for each of the plurality of alternative energy source modules. The method also includes constructing a data structure of the relative positions of the plurality of alternative energy source modules employing the output voltage for ones of the plurality of alternative energy source modules.
    Type: Grant
    Filed: May 22, 2015
    Date of Patent: February 27, 2018
    Assignee: SunPower Corporation
    Inventor: Patrick Chapman
  • Patent number: 9837924
    Abstract: Power conversion systems, methods and precharge systems are disclosed to charge a DC bus capacitor, including thyristors and reverse diodes coupled in AC circuit paths between AC input lines and a rectifier, a precharge resistor coupled in one or more of the AC circuit paths, and a controller to turn all the thyristors off to allow the DC bus capacitor to charge through the precharge resistor, and to turn all the thyristors on when the DC bus voltage reaches a non-zero threshold value.
    Type: Grant
    Filed: June 2, 2016
    Date of Patent: December 5, 2017
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Lixiang Wei, Zeljko Radomir Jankovic
  • Patent number: 9825479
    Abstract: A charging/discharging control system of an energy storage apparatus includes a weather information collection module, a load information collection module, a load grouping module which classifies a plurality of loads into at least one load group based on a load correlation according to a predetermined condition, and an energy storage apparatus charging/discharging control module which determines a battery charging or discharging level per time slot of each of a plurality of energy storage apparatuses by using at least one of an estimated load amount of each load per time slot, a battery charging amount of the energy storage apparatus per time slot via solar generation, and a battery charging amount per time slot via system power, wherein a particular load corresponding to a lowest rate for a unit load is determined by using battery charging/discharging information and power rate information per time slot.
    Type: Grant
    Filed: December 17, 2012
    Date of Patent: November 21, 2017
    Assignee: KT Corporation
    Inventors: Min-Gyung Kim, Min-Jin Lee
  • Patent number: 9766279
    Abstract: Provided is an electronic apparatus that can prevent erroneous detection of a sensor output due to an AC line noise. A power supply circuit includes a noise filter, input rectifying smoothing circuit, converter circuit, and output smoothing circuit. The input rectifying smoothing circuit rectifies an input AC voltage passed through the noise filter to a pulsating flow and then smooth it. The converter circuit converts a DC voltage rectified and smoothed into a desired output voltage. The output smoothing circuit smoothes the convert output voltage to supply it to a control part. The noise determination part detects a noise that could not have been removed by the noise filter, as an AC line noise. The control part invalidates a detection signal outputted from the sensor for a previously set invalid period from the moment the AC line noise has been detected.
    Type: Grant
    Filed: June 30, 2015
    Date of Patent: September 19, 2017
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Kensuke Fujihara
  • Patent number: 9755695
    Abstract: The present invention discloses an input/output (I/O) signal processing circuit and processing method. The I/O signal processing circuit includes a level adjustable I/O circuit and an adjustment circuit. The I/O signal processing circuit includes an output driver and/or an input comparator. The output driver transmits an output signal via a signal transmission line according to an output data. The output driver has an adjustable high operation voltage level and an adjustable low operation voltage level, which determine a high level and a low level of the output signal, respectively. The input comparator receives an input signal via the signal transmission line and comparing the input signal with an adjustable reference voltage, so as to generate an input data. The adjustment circuit generates an adjustment signal according to voltage drop related information, to correspondingly adjust the adjustable high and low operation voltage level and/or the adjustable reference voltage.
    Type: Grant
    Filed: April 12, 2016
    Date of Patent: September 5, 2017
    Assignee: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Yi-Min Shiu, Chao-Chi Chen, Pei-Sheng Tsu
  • Patent number: 9722491
    Abstract: A method and apparatus operate a switchmode power supply. The apparatus can include a pulse width modulation controller that can produce a first pulse width modulation signal at a first frequency. The apparatus can include a switchmode power supply switching element including a control terminal. The apparatus can include a harmonic filter coupled between the pulse width modulation controller and the control terminal of the switching element. The harmonic filter can provide a second pulse width modulation signal at a second frequency to the control terminal of the switching element. The second frequency can be higher than the first frequency.
    Type: Grant
    Filed: October 13, 2014
    Date of Patent: August 1, 2017
    Assignee: GOOGLE TECHNOLOGY HOLDINGS LLC
    Inventor: Daniel H. Wagner
  • Patent number: 9627892
    Abstract: In various embodiments, an electrical subpanel system is disclosed. The subpanel system may include a DC/AC inverter configured to accept a DC electrical input and to provide an auxiliary AC current output; a quick-disconnect coupling, a busbar connected between the auxiliary AC current output and the quick-disconnect coupling, a receptacle for connecting to at least one electrical device coupled in parallel to said busbar, where the quick-disconnect coupling may be configured to be selectively connected to a mains branch circuit current.
    Type: Grant
    Filed: May 28, 2014
    Date of Patent: April 18, 2017
    Assignee: SolarWorld Americas Inc.
    Inventors: Steven Meredith, Nathan Stoddard, Chris Stapelmann
  • Patent number: 9590528
    Abstract: A dual mode direct current-to-alternating current (DC-AC) inverter is capable of operating either with or without connection to an active external AC power source. The dual mode DC-AC inverter may operate in “current control mode” when connection to the active AC power source is present and may operate in “power control mode” when connection to the active external AC source is absent. Processes for operating an array of these DC-AC inverters are disclosed. The dual mode operation capability enables the DC-AC inverters to function both in the grid connected mode (i.e., current control mode) as well as off-grid mode (i.e., power control mode). The system is configured to sense the presence or absence of grid power and automatically select the appropriate mode of operation. For the power control mode of operation, a process may include designating a master from the array of DC-AC inverters in order to establish the voltage and frequency reference.
    Type: Grant
    Filed: February 12, 2016
    Date of Patent: March 7, 2017
    Assignee: Kripya LLC
    Inventors: Vilakkudi G. Veeraraghavan, Ramarao Ananathakrishnan, Muthiam S Balavenkataraman
  • Patent number: 9583946
    Abstract: A method and apparatus for regulating an input voltage to a power conversion module. In one embodiment, the method comprises computing a voltage regulation threshold based on an output voltage for the power conversion module; comparing an input voltage of the power conversion module to the voltage regulation threshold; and generating, when the input voltage satisfies the voltage regulation threshold, an average input voltage less than the voltage regulation threshold, wherein the average input voltage is generated from the input voltage.
    Type: Grant
    Filed: May 26, 2011
    Date of Patent: February 28, 2017
    Assignee: Enphase Energy, Inc.
    Inventor: Martin Fornage
  • Patent number: 9548721
    Abstract: The floating immittance emulator is presented in four embodiments in which four new topologies for emulating floating immittance functions are detailed. Each circuit uses three current-feedback operational-amplifiers (CFOAs) and three passive elements. The present topologies can emulate lossless and lossy floating inductances; capacitance, resistance, and inductance multipliers; and frequency-dependent positive and negative resistances.
    Type: Grant
    Filed: November 24, 2015
    Date of Patent: January 17, 2017
    Assignee: KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS
    Inventors: Muhammad Taher Abuelma'atti, Sagar Kumar Dhar
  • Patent number: 9537474
    Abstract: Electronic circuits and memory circuits are provided for implementing a method for transforming a chip clock signal to a local clock signal. The method includes: generating a first clock signal in response to the chip clock signal, a first control signal and a second control signal; generating a second clock signal by delaying the first clock signal with a second clock delay; generating the first control signal and the second control signal by delaying the second clock signal with a pulse width delay, where the first control signal goes from high-to-low with a control signal delay after the second control signal goes from high-to-low, and vice versa; and generating the local clock signal based on the second clock signal.
    Type: Grant
    Filed: October 26, 2015
    Date of Patent: January 3, 2017
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Yuen Hung Chan, Juergen Pille, Rolf Sautter, Tobias Werner
  • Patent number: 9531191
    Abstract: A method and apparatus for power imbalance correction comprising: a plurality of converters for converting a plurality of DC inputs to a multi-phase AC output, and coupling the multi-phase AC output to a multi-phase AC line, and a controller coupled to the plurality of converters. The controller determining whether phases of the multi-phase AC output are balanced, and controlling when all phases of the multi-phase AC output are not balanced, at least one converter of the plurality of converters to balance the multi-phase AC output.
    Type: Grant
    Filed: January 22, 2014
    Date of Patent: December 27, 2016
    Assignee: Enphase Energy, Inc.
    Inventors: Raghuveer R. Belur, Ho Gene Choi, Mark Baldassari
  • Patent number: 9531297
    Abstract: A power conversion system (10) for converting power from a plurality of solar panels. The system (10) comprises a plurality of panel modules (14) each having an input (16) and an output (17) and being connected in series. Each panel module (14) is connected to at least one solar panel (12) that supplies power to the panel module (14). Voltage control circuitry is provided within each of the panel modules (14) to vary the voltage supplied between the input (16) and the output (17) between a maximum module voltage and a minimum module voltage. A control unit (29) in communication with the voltage control circuitry of each of the panel modules varies the voltage supplied across the input (16) and output (17) of each of the panel modules (14) such that the total voltage across the series connected panel modules (14) forms an AC signal or a rectified version of an AC signal.
    Type: Grant
    Filed: August 4, 2011
    Date of Patent: December 27, 2016
    Inventor: Kevin Stephen Davies
  • Patent number: 9509233
    Abstract: A power converter according to embodiments includes a boost circuit, a single-phase inverter, a current controller, and a power conversion controller. The current controller generates a voltage reference based on a difference between current output from the single-phase inverter and a current reference. The power conversion controller controls the single-phase inverter to generate a first portion of the AC voltage, and controls the boost circuit to generate a second portion of the AC voltage. The first portion corresponds to the voltage reference of which an absolute value is smaller than the voltage of the DC power supply. The second portion corresponds to the voltage reference of which an absolute value is greater than the voltage of the DC power supply.
    Type: Grant
    Filed: March 20, 2015
    Date of Patent: November 29, 2016
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Kozo Ide, Tetsumi Narita, Seiji Fujisaki, Mamoru Takaki, Shinya Morimoto
  • Patent number: 9490626
    Abstract: A method of detecting an interruption of grid electrical power at an output of an inverter power train coupled to an electrical grid includes generating a reference waveform representing a power train output current waveform with a current control loop. An out-of-phase control signal is generated, which is synchronized and out-of-phase with a grid voltage waveform, with a voltage control loop coupled to the output of the inverter power train, the voltage control loop having a gain proportional to an inverter power train load impedance. The reference waveform and the out-of-phase control signal are combined to generate a power train control signal for producing a small phase difference between the inverter power train output current waveform and the grid voltage waveform.
    Type: Grant
    Filed: January 16, 2014
    Date of Patent: November 8, 2016
    Assignee: AEG Power Solutions BV
    Inventor: William Dewey Elliott, II
  • Patent number: 9469411
    Abstract: The invention relates to a power supply system that is adapted be connected in input to N distinct power supply grids (R1, . . . , RN) delivering a direct or alternating input voltage (V1, VN) and to deliver a direct distribution voltage (VBUS), N being an integer greater than or equal to 2, of the type comprising a distribution bus operating under the distribution voltage (VBUS), N unidirectional converters (C1, . . . , CN) that can respectively be connected in input to a given power grid (R1, . . . , RN), and control means capable of controlling the unidirectional converters (C1, . . . CN). The power supply system also includes an energy storage device connected to the distribution bus and having a quantity of energy (E), and the control means are adapted to control the unidirectional converters (C1, . . . CN) simultaneously to regulate the electrical power (P1, . . . PN) delivered by each of said unidirectional converters (C1, . . . , CN) as a function of the quantity of energy (E).
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: October 18, 2016
    Assignee: THALES
    Inventors: Christophe Taurand, Stefan Mollov
  • Patent number: 9444366
    Abstract: A dual mode direct current-to-alternating current (DC-AC) micro-inverter is capable of operating either with or without connection to an active external AC power source. The dual mode DC-AC micro-inverter may operate in “current control mode” when connection to the active AC power source is present and may operate in “voltage control mode” when connection to the active external AC source is absent. Processes for operating an array of these micro-inverters are disclosed. The dual mode operation capability enables the micro-inverter(s) to function both in the grid connected mode (i.e., current control mode) as well as off-grid mode (i.e., voltage control mode). The system is configured to sense the presence or absence of grid power and automatically select the appropriate mode of operation. For the voltage control mode of operation, a process may include designating a master from the array of micro-inverters in order to establish the voltage and frequency references.
    Type: Grant
    Filed: February 6, 2015
    Date of Patent: September 13, 2016
    Assignee: Kripya LLC
    Inventors: Vilakkudi G. Veeraraghavan, Ramarao Ananathakrishnan, Muthiam S Balavenkataraman
  • Patent number: 9389573
    Abstract: An image forming apparatus includes a heat generator configured to generate heat in the image forming apparatus; a converter including a capacitor to convert AC power supplied from an external power supply into DC power for a load unit; a thermoelectric transducer configured to convert the generated heat into DC power for the load unit; a detector configured to detect a voltage of the AC power; and a controller configured to cause the converter to continue supplying the DC power to the load unit when a first elapsed time elapsed since the detected voltage drops below a rated voltage is shorter than a first time period shorter than an upper limit of a period of time over which the capacitor is dischargeable, and cause the thermoelectric transducer to supply the DC power to the load unit when the first elapsed time exceeds the first time period.
    Type: Grant
    Filed: June 22, 2015
    Date of Patent: July 12, 2016
    Assignee: RICOH COMPANY, LIMITED
    Inventors: Norikazu Okada, Takaaki Shirai, Takuma Kasai, Keita Maejima, Tomoyuki Yamashita, Ryohta Kubokawa, Satoru Tao, Homare Ehara
  • Patent number: 9302912
    Abstract: Improvements in the supply of high-frequency electrical power to ozone-producing cells can be accomplished using the systems and techniques described herein. Application of a DC-DC converter operating at a switching frequency substantially greater than a load frequency, supports generation of a high-voltage AC for powering such cells, while allowing for reductions in component size and reductions in a quality factor of a load tuning circuit. Controllable power inverters used in obtaining one or more of the switching and load frequencies can be controlled using feedback techniques to provide stable, high-quality power to ozone-producing cells under variations in one or more of externally supplied power and load conditions. An inrush protection circuit can also be provided to selectively introduce a current-limiting resistance until an input DC bus has been sufficiently initialized as determined by measurements obtained from the DC bus.
    Type: Grant
    Filed: March 28, 2012
    Date of Patent: April 5, 2016
    Assignee: MKS Instruments, Inc.
    Inventors: Ken Tran, Feng Tian, Xing Chen, Franklin Lee
  • Patent number: 9294030
    Abstract: A method of PWM regulating a motor through a half-bridge drive stage includes sampling the motor current to obtain sampled values during driving intervals or during current decay intervals, and comparing a last sampled value with a current threshold. The motor is coupled in a slow decay electrical path for the duration of a current decay interval if the last sampled value does not exceed the current threshold. Otherwise the motor is coupled in a fast decay electrical path for a portion of the duration of the current decay interval, and is coupled in the slow decay electrical path for a remaining part of the duration of the same current decay interval.
    Type: Grant
    Filed: January 30, 2014
    Date of Patent: March 22, 2016
    Assignee: STMICROELECTRONICS S.R.L.
    Inventors: Paolo Pascale, Federico Magni, Ezio Galbiati, Giuseppe Maiocchi, Michele Berto Boscolo
  • Patent number: 9270191
    Abstract: A power conditioning unit with maximum power point tracking (MPPT) for a dc power source in a photovoltaic panel is provided. The power conditioning unit includes a power injection control block having a sense input coupled to an energy storage capacitor on a dc link for controlling 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. The measured signal is a ripple voltage level and the power injection control block controls the amplitude of an ac current output such that the amount of power transferred to the grid mains is dependent on the amplitude of a sinusoidal voltage component on the energy storage capacitor.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: February 23, 2016
    Assignee: SOLARCITY CORPORATION
    Inventors: Lesley Chisenga, Gehan Anil Joseph Amaratunga, Cuauhtemoc Rodriguez
  • Patent number: 9252596
    Abstract: A reactive power compensation method includes generating a variable power factor curve for at least one power generator based on information regarding network parameters; obtaining a value of an active output power parameter from the at least one generator; computing a reactive power based on the variable power factor curve and the value of the active power output parameter of the at least one generator; generating a reactive power compensation command based on the computed reactive power; and transmitting the reactive power compensation command to the at least one power generator for controlling operation of the at least one power generator.
    Type: Grant
    Filed: November 28, 2011
    Date of Patent: February 2, 2016
    Assignee: General Electric Company
    Inventors: Ara Panosyan, Reigh Allen Walling
  • Patent number: 9246330
    Abstract: A method and system for operating a photovoltaic module includes providing a reversed electrical bias to the photovoltaic module.
    Type: Grant
    Filed: April 26, 2012
    Date of Patent: January 26, 2016
    Assignee: FIRST SOLAR, INC.
    Inventors: Benyamin Buller, Dmitriy Marinskiy
  • Patent number: 9240705
    Abstract: The present invention relates to a control apparatus and a control method which is capable of reliably preventing electric power not required to be returned to an electric power system from flowing out to the electric power system. A bidirectional DCAC converting unit converts DC power stored in a storage battery to AC power, and outputs the converted power to each load. Further, a current detecting unit is arranged on a wire from the electric power system which is connected to a wire between the bidirectional DCAC converting unit and each load, and the current detecting unit detects a current flowing between the connection point and the electric power system. A control unit increases/reduces an amount of AC power output of the bidirectional DCAC converting unit based on an amount of current detected by the current detecting unit, thereby to control a supply of electric power to each load.
    Type: Grant
    Filed: April 1, 2011
    Date of Patent: January 19, 2016
    Assignee: OMRON CORPORATION
    Inventors: Akihiro Fumamoto, Akira Enami
  • Patent number: 9236805
    Abstract: A system and a method for controlling a DC-DC converter include a microcomputer for deriving an input limiting current value by dividing an input limiting power value by an input voltage value. A conversion circuit scales the input limiting current value to a limiting voltage value. A voltage control circuit derives a control voltage value based on an output voltage value and a reference voltage value and defines the limiting voltage value as a control voltage limiting value. A current control circuit generates a pulse width modulation (PWM) control signal based on the control voltage value.
    Type: Grant
    Filed: September 10, 2013
    Date of Patent: January 12, 2016
    Assignee: HYUNDAI MOTOR COMPANY
    Inventors: Won Kyoung Choi, Hui Sung Jang, Sung Kyu Kim, Mu Shin Kwak, Hyun Wook Seong, Su Hyun Bae
  • Patent number: 9197291
    Abstract: A transformer arrangement for signal transmission is provided, the transformer arrangement having at least one transformer with a primary coil and a secondary coil and a controller. The controller is configured in a magnetization phase to control a first current to flow through the primary coil to increase until a predefined criterion is fulfilled, wherein the magnetization phase is longer than a time constant of the primary coil of the at least one transformer. The controller is configured in a voltage application phase to apply a voltage to the at least one transformer so that a second current flows through the primary coil, wherein the second current has a polarity which changes during the voltage application phase compared with the first current, wherein the voltage application phase is shorter than two times the time constant of the primary coil of the at least one transformer.
    Type: Grant
    Filed: June 16, 2014
    Date of Patent: November 24, 2015
    Assignee: INFINEON TECHNOLOGIES AG
    Inventor: Martin Feldtkeller
  • Patent number: 9190899
    Abstract: A power circuit for protecting against high pulse load current and inrush current is disclosed. The power circuit comprises a buck-boost module and a PFC controller operatively coupled with the buck-boost module. The PFC controller is configured to receive an input voltage feedback, an output voltage feedback, and a current feedback, and is configured to utilize one of an Integral Gain Compensation (IGC) and an Integral Value Compensation (IVC) to control the high pulse load current and inrush current in the power circuit.
    Type: Grant
    Filed: September 26, 2012
    Date of Patent: November 17, 2015
    Assignee: General Electric Company
    Inventor: Niranjan Kumar
  • Patent number: 9166500
    Abstract: A power conversion system is disclosed including a DC bus for receiving DC power, a power converter for converting the DC power to AC power, and a controller. The controller includes an active power regulator for generating a phase angle command signal, a reactive power regulator for generating a voltage magnitude command, and an active power (P) and reactive power (Q) decoupling unit for decoupling interaction between the active and reactive power regulators. The PQ decoupling unit includes an active power compensation element and a reactive power compensation element. The active power compensation element is used for generating a phase angle compensation signal based on a reactive power error signal, to compensate the phase angle command signal. The reactive power compensation element is used for generating a voltage magnitude compensation signal based on an active power error signal, to compensate the voltage magnitude command signal.
    Type: Grant
    Filed: March 24, 2014
    Date of Patent: October 20, 2015
    Assignee: General Electric Company
    Inventors: Xinhui Wu, Jiao Liu, Dan Hou, Xueqin Wu, Zhuohui Tan
  • Patent number: 9143042
    Abstract: A power converter nearly losslessly delivers energy and recovers energy from capacitors associated with controlled rectifiers in a secondary winding circuit, each controlled rectifier having a parallel uncontrolled rectifier. First and second primary switches in series with first and second primary windings, respectively, are turned on for a fixed duty cycle, each for approximately one half of the switching cycle. Switched transition times are short relative to the on-state and off-state times of the controlled rectifiers. The control inputs to the controlled rectifiers are cross-coupled from opposite secondary transformer windings.
    Type: Grant
    Filed: July 22, 2013
    Date of Patent: September 22, 2015
    Assignee: SynQor, Inc.
    Inventor: Martin F. Schlecht