For Inverter Patents (Class 363/95)
  • 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
  • Patent number: 9136765
    Abstract: A power converter controller includes a primary controller that is galvanically isolated from a secondary controller. The primary controller controls a state of a power switch during a first mode of operation according to a switching pattern defined by the primary controller. During a second mode of operation, the primary controller controls the state of the power switch in response to control signals received via a communication link. The secondary controller operates in a powered down state during the first mode of operation. The secondary controller initiates a transition operation with the primary controller that transitions the primary controller and the secondary controller from the first mode of operation to the second mode of operation. In the second mode of operation, the secondary controller transmit the control signals to the primary controller via the communication link.
    Type: Grant
    Filed: March 8, 2013
    Date of Patent: September 15, 2015
    Assignee: Power Integrations, Inc.
    Inventors: Balu Balakrishnan, Alex B. Djenguerian, Sheng Liu
  • Patent number: 9136703
    Abstract: A string and load balancer system that provides the ability to boost the string voltage in low-light or reduced-power conditions so that the inverter may continue to operate. The boost operation can be achieved by addition of a single substantially D.C. switch. The DC switch may be rated for the maximum intended voltage boost, not the maximum bus voltage. A string and load balancer provided herein may allow photovoltaic arrays to be productive in mornings, evenings, and in clouded or otherwise sub-nominal conditions.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: September 15, 2015
    Assignee: Maxout Renewables, Inc.
    Inventor: Eric B. Cummings
  • Patent number: 9130470
    Abstract: A power converter control system includes primary bridge controller that is configured to actuate a first plurality of gate drive units that switch a first plurality of power elements in a primary bridge of a power converter. The control system further includes a secondary bridge controller separate from the primary bridge controller that is configured to actuate a second plurality of gate drive units to switch a second plurality of power elements in a secondary bridge of the power converter.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: September 8, 2015
    Assignee: General Electric Company
    Inventors: Sebastian Pedro Rosado, Henry Todd Young, Simon Herbert Schramm, Alvaro Jorge Mari Curbelo, Jason Daniel Kuttenkuler, Paolo Soldi
  • Patent number: 9124209
    Abstract: Power converters and methods are presented for driving an AC load connected through an intervening filter circuit, in which at least one filter current or voltage signal or value is determined according to feedback signals or values representing an output parameter at an AC output of the power converter, and AC electrical output power is generated at the AC output based at least partially on the at least one filter current or voltage signal or value.
    Type: Grant
    Filed: January 16, 2013
    Date of Patent: September 1, 2015
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Jingbo Liu, Thomas Nondahl, Peter Schmidt, Semyon Royak
  • Patent number: 9124174
    Abstract: A method is described comprising conducting a first current through a switching transistor. The method also comprises conducting a second current through a pair of transistors whose conductive channels are coupled in series with respect to each other and are together coupled in parallel across the switching transistor's conductive channel. The second current is less than and proportional to the first current.
    Type: Grant
    Filed: June 10, 2013
    Date of Patent: September 1, 2015
    Assignee: Micron Technology, Inc.
    Inventors: Gerhard Schrom, Peter Hazucha, Vivek K. De, Tanay Karnik
  • Patent number: 9123696
    Abstract: In a semiconductor device including semiconductor modules, it is possible to average the temperatures of the semiconductor modules. At least two semiconductor modules, wherein a plurality of semiconductor circuits, on which are mounted one or more semiconductor chips having a gate terminal and gate resistors connected to the gate terminals, are disposed in parallel, are disposed above a cooling body so that an array direction of the semiconductor circuits is a direction intersecting a refrigerant flow. At least one temperature detecting resistor is disposed in each semiconductor module, a gate signal is supplied to a gate signal input terminal of one semiconductor module of the at least two semiconductor modules via the temperature detecting resistor of the other semiconductor module, and a gate signal is supplied to a gate signal input terminal of the other semiconductor module via the temperature detecting resistor of the one semiconductor module.
    Type: Grant
    Filed: August 12, 2013
    Date of Patent: September 1, 2015
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventor: Yujin Okamoto
  • Patent number: 9118254
    Abstract: Disclosed is a DC-DC converter. The DC-DC converter includes a power input unit to which power is applied, a first module comprising a first transformer and a second transformer to output a first output power transformed according to operations of a first switch and a second switch connected with the first transformer and the second transformer by using the applied power, a second module comprising a third transformer and a fourth transformer to output a second output power transformed according to operations of a third switch and a fourth switch connected with the third transformer and the fourth transformer by using the applied power, an output unit to output a sum of the first output power and the second output power, and a controller to control an interleaving operations between the first module and the second module.
    Type: Grant
    Filed: July 1, 2013
    Date of Patent: August 25, 2015
    Assignees: LSIS Co., Ltd., SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION
    Inventors: Woo Sup Kim, Jae Ho Lee, Chun Suk Yang, Seoung Woon Lee, Bo Hyung Cho
  • Patent number: 9106152
    Abstract: A method for grid support by means of an inverter is disclosed, wherein the grid is supported by feeding in compensation currents. The method includes measuring a prevailing grid state, and breaking down voltages measured for measuring the prevailing grid state into symmetrical components of the grid state including positive sequence system components and negative sequence system components. The method further includes determining symmetrical components of a compensation current including positive sequence system components and negative sequence system components of the compensation current as functions of deviations of the positive sequence system components and negative sequence system components of the grid state from reference values, and feeding-in a compensation current as the vector sum of the determined symmetrical components of the compensation current.
    Type: Grant
    Filed: February 21, 2013
    Date of Patent: August 11, 2015
    Assignee: SMA Solar Technology AG
    Inventors: Karel De Brabandere, Vitali Sakschewski, Lars Cramer, Yehia Tarek Fawzy, Stijn Stevens, Daniel Premm
  • Patent number: 9106074
    Abstract: Aspects of the invention address a circumstance in multilevel power converter devices having a bidirectional switch connected to a middle point of a DC power supply assembly, whereby interruption of the device may cause break down of semiconductor switches due to overvoltage if the semiconductor switches are totally interrupted simultaneously. In some aspects, a shut down procedure of a multilevel power converter device having a bidirectional switch connected to the middle point of a DC power supply assembly, gates of semiconductor switches are interrupted one by one according to a predetermined sequence or a sequence corresponding to the conditions of voltage and current at that moment with a time interval, and finally the bidirectional switch connected to the middle point of a DC power supply assembly is interrupted. As a result, a transition from an operating state to a shut down state can be made with minimum voltage variation.
    Type: Grant
    Filed: February 13, 2013
    Date of Patent: August 11, 2015
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventor: Satoki Takizawa
  • Patent number: 9083272
    Abstract: According to an embodiment, a motor control circuit includes a rotational position decoding unit, a rotational position determining unit, and a motor drive signal generating unit. The rotational position decoding unit is configured to generate a rotational position signal representing a rotational position of a motor according to a sensor signal provided by a sensor. The rotational position determining unit is configured to store a current rotational position of the motor based on the rotational position signal. When the rotational position signal represents a subsequent rotational position of the stored current rotational position, the rotational position determining unit is configured to update the stored current rotational position with the subsequent rotational position, and generate a motor control signal representing the subsequent rotational position. The motor drive signal generating unit is configured to generate a motor drive signal for driving the motor according to the motor control signal.
    Type: Grant
    Filed: March 14, 2012
    Date of Patent: July 14, 2015
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Fumio Noguchi, Yoshihito Nakamura
  • Patent number: 9059604
    Abstract: A photovoltaic power plant includes a photovoltaic inverter that converts direct current generated by solar cells to alternating current. The output of the photovoltaic inverter is provided to a point of interconnection to a power grid. A meter at the point of interconnection may be read to detect the output of the photovoltaic inverter at the power grid. The photovoltaic power plant includes a plant controller with a state machine. The plant controller is configured to adjust setpoints of the photovoltaic inverter to control the output of the photovoltaic power plant. The plant controller is also configured to soft start and soft stop automatic voltage regulation (AVR) of the photovoltaic power plant to prevent perturbing the AVR.
    Type: Grant
    Filed: June 27, 2011
    Date of Patent: June 16, 2015
    Assignee: SunPower Corporation
    Inventor: Lars Johnson
  • Patent number: 9048835
    Abstract: In a power supply, a synchronous rectification switch rectifies a pulse voltage, and a current-voltage conversion unit converts a current on a voltage-input side of the synchronous rectification switch to a first voltage and converts a current on a voltage-output side of the synchronous rectification switch to a second voltage. A switching unit switches an operation state of the synchronous rectification switch based on a result of a comparison between the first voltage and the second voltage converted by the current-voltage conversion unit. A state holding unit holds an off state after the synchronous rectification switch is turned off by the switching unit.
    Type: Grant
    Filed: October 26, 2012
    Date of Patent: June 2, 2015
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Minoru Hayasaki
  • Patent number: 9042141
    Abstract: A system that manages a supplemental energy source connected to a power grid uses a two stage control strategy to manage power transfers in and out of the power grid as well as in and out of an energy storage system, such as a battery bank. One stage uses a non-linear transfer function to control an output frequency of a DC-to-AC inverter to limit undesired effects of power transients that occur on the grid. A second stage uses control strategy for transferring energy between the energy storage system and an internal DC link based on a relationship between a voltage on a DC link connecting the first and second stages and a DC link reference voltage, the voltage on the DC link, and a voltage at the energy storage system. The control strategy includes rapid charging, over-charging protection, and grid transient stabilization.
    Type: Grant
    Filed: February 7, 2013
    Date of Patent: May 26, 2015
    Assignee: Caterpillar Inc.
    Inventors: Dachuan Yu, Greg Speckhart
  • Patent number: 9036378
    Abstract: A power conversion system with adjustable frequency includes an electric transformer, a pulse width modulation driving controller, a switching transistor, a first and second voltage division resistors connected in series, an output diode and an output capacitor. The electric transformer receives the input power and generates the sensing current and induced current. The sensing current flows through the first and second voltage division resistors to generate the feedback signal. The induced current flows through the output diode and output capacitor to generate the output voltage to supply the load. The pulse width modulation driving controller determine whether the loading state of the load based on the feedback signal, and change the switching frequency according to the loading state and the input power, thereby increasing the whole efficiency of the power conversion system and achieving the aim of dynamically adjusting the optimal frequency.
    Type: Grant
    Filed: September 10, 2013
    Date of Patent: May 19, 2015
    Assignee: INNO-TECH CO., LTD.
    Inventors: Ching-Yuan Lin, Shu-Chia Lin, Chih Feng Lin