In Inverter Systems Patents (Class 363/40)
  • Patent number: 10374504
    Abstract: A power unit includes: a plurality of power converters, a first output terminal of one of two adjacent power converters among the plurality of power converters is connected successively to a second output terminal of the other one of the two adjacent power converters; a local controller configured to output a plurality of control signals; and a plurality of driving circuits configured to output driving signals according to the plurality of control signals, to drive the plurality of power semiconductor switches to be turned on and off, wherein the control signals corresponding to the power semiconductor switches in the same position of the plurality of power converters are the same, the power semiconductor switches in the same position of the plurality of power converters are simultaneously turned on and off.
    Type: Grant
    Filed: September 19, 2017
    Date of Patent: August 6, 2019
    Assignee: Delta Electronics (Shanghai) CO., LTD
    Inventors: Jianping Ying, Ming Wang, Xiaobo Huang, Jun Liu
  • Patent number: 10367423
    Abstract: Each DC/DC converter includes a transformer, first and second switching circuits each formed of a plurality of legs having a plurality of semiconductor switching elements, capacitors, a discharge circuit connected in parallel to the secondary side capacitor, and a bypass switch for bypassing the capacitor. When detecting a malfunction in semiconductor switching elements, a control circuit turns OFF all of the semiconductor switching elements, and controls the bypass switch after discharge of the capacitor through the discharge circuit, so that the capacitor is bypassed.
    Type: Grant
    Filed: June 22, 2017
    Date of Patent: July 30, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takushi Jimichi, Nils Soltau, Murat Kaymak, Rik W. De Doncker
  • Patent number: 10170914
    Abstract: A Voltage Source Converter control system for active damping of a resonance oscillation in the VSC includes a regular Phase-Locked Loop 2, and a slow PLL 3. The control system is arranged such that an imaginary part of the AD is obtainable from the slow PLL. The slow PLL is configured for having a closed-loop bandwidth which is less than a frequency, in a synchronous dq frame, of the resonance oscillation to be dampened.
    Type: Grant
    Filed: September 1, 2015
    Date of Patent: January 1, 2019
    Assignee: ABB SCHWEIZ AG
    Inventor: Lennart Harnefors
  • Patent number: 10158328
    Abstract: Various envelope tracking amplifiers are presented that can be switched between an ET (envelope tracking) mode and a non-ET mode. Switches and/or tunable components are utilized in constructing the envelope tracking amplifiers that can be switched between the ET mode and the non-ET mode.
    Type: Grant
    Filed: June 9, 2017
    Date of Patent: December 18, 2018
    Assignee: pSemi Corporation
    Inventors: Dan William Nobbe, Jeffrey A. Dykstra, Chris Olson, James S. Cable
  • Patent number: 10103689
    Abstract: The present invention relates to the photoelectric field, and provides a power supply system and a power supply method, so as to reduce costs of a lead between a positive electrode or a negative electrode of a photovoltaic panel and a direct current voltage source. The power supply system includes: a photovoltaic panel string, an inverter connected to the photovoltaic panel string, and a transformer connected to the inverter. The power supply system further includes a voltage controller. The voltage controller includes a first terminal, a second terminal, and a third terminal. The voltage controller further includes: a first sampling unit, a control unit connected to the first sampling unit, and an inverter unit.
    Type: Grant
    Filed: November 27, 2017
    Date of Patent: October 16, 2018
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Yunyan Xu, Yongbing Gao
  • Patent number: 10044220
    Abstract: When the power is normally supplied from the commercial power supply, the storage battery is charged by reducing the DC voltage by the charge/discharge chopper. The switching unit is provided in the previous stage of the converter. When the commercial power supply is in an abnormal state, the three-phase AC converter is operated as three discharge choppers connected in parallel by supplying the power of the storage battery to the converter and boosting the power by the switching element included in the converter. The power of the storage battery is boosted by the charge/discharge chopper, and a part of the discharging power is supplied. One three-phase AC reactor is provided in the previous stage of the converter, and the three-phase AC reactor has three coils, magnetic leg iron cores having the coils winding around them, and one leg without a coil winding around it connected in parallel.
    Type: Grant
    Filed: May 4, 2015
    Date of Patent: August 7, 2018
    Assignee: Hitachi, Ltd.
    Inventors: Yuichiro Konishi, Atsuo Nishihara, Keisuke Horiuchi
  • Patent number: 9987937
    Abstract: A two layer predictive controller for bidirectional inductive power transfer can include: a first layer controller generating a mutual inductance and a reference active power; and a second layer controller receiving the mutual inductance and the reference active power, and generating a primary phase shift, a secondary phase shift, and a differential phase shift; the primary phase shift configured to manage a magnitude of an output voltage of a primary inverter; the secondary phase shift configured to manage a magnitude of an output voltage of a secondary inverter; and the differential phase shift being a phase difference between the output voltage of the primary inverter and the output voltage of the secondary inverter.
    Type: Grant
    Filed: December 20, 2017
    Date of Patent: June 5, 2018
    Assignee: The Florida International University Board of Trustees
    Inventors: Ahmed A. S. Mohamed, Osama A. Mohammed
  • Patent number: 9923449
    Abstract: The present disclosure relates to a damping apparatus of a converter system, which compensates an input voltage reference being transmitted to a converter to damp an output current of a harmonic filter that is connected between an output end of the converter and a system, including a voltage reference compensation unit configured to compensate for the input voltage reference using a ratio between inductances of inductors included in the harmonic filter; a capacitor voltage value compensation unit configured to compensate for a voltage value of a capacitor included in the harmonic filter using the ratio between the inductances of the inductors; and a voltage reference generation unit configured to generate a final voltage reference by subtracting the compensated voltage value of the capacitor from the compensated input voltage reference.
    Type: Grant
    Filed: November 17, 2016
    Date of Patent: March 20, 2018
    Assignee: LSIS CO., LTD.
    Inventor: Byung-Geuk Cho
  • Patent number: 9837922
    Abstract: A method is disclosed in one embodiment for discharging DC link capacitors. In one form the method includes switching a first half bridge of a first converter unit to a positive state, in which its AC output is connected with its positive DC output, and simultaneously switching a second half bridge of a second converter unit to a negative state, in which its AC output is connected with its negative DC output, such that a DC link capacitor of the first converter unit and a DC link capacitor of the second converter unit are interconnected oppositely to each other and discharged via the electrical filter.
    Type: Grant
    Filed: October 28, 2016
    Date of Patent: December 5, 2017
    Assignee: ABB Technology Oy
    Inventors: Matthias Lüscher, Juerg Rauchenstein, Christian Stulz
  • Patent number: 9825556
    Abstract: An inverter includes a three-winding transformer, a DC-AC inverter electrically coupled to the first winding of the transformer, a cycloconverter electrically coupled to the second winding of the transformer, and an active filter electrically coupled to the third winding of the transformer. The DC-AC inverter is adapted to convert the input DC waveform to an AC waveform delivered to the transformer at the first winding. The cycloconverter is adapted to convert an AC waveform received at the second winding of the transformer to the output AC waveform having a grid frequency of the AC grid. The active filter is adapted to sink and source power with one or more energy storage devices based on a mismatch in power between the DC source and the AC grid. At least two of the DC-AC inverter, the cycloconverter, or the active filter are electrically coupled via a common reference electrical interconnect.
    Type: Grant
    Filed: March 24, 2016
    Date of Patent: November 21, 2017
    Assignee: SunPower Corporation
    Inventor: Fernando Rodriguez
  • Patent number: 9812951
    Abstract: A power factor correction voltage controller is disclosed. In one embodiment, the controller has a linear PI compensator, a moving average filter, a non-linear error circuit, a hysteretic peak control, and an output power feedforward. The power factor correction voltage controller provides regulation of maximum and minimum voltage values but without allowing large periodic fluctuations in the input power/current.
    Type: Grant
    Filed: May 19, 2016
    Date of Patent: November 7, 2017
    Assignee: Pacific Power Source, Inc.
    Inventor: Maximiliano O. Sonnaillon
  • Patent number: 9806618
    Abstract: A first conversion circuit is electrically connected between a reference potential point and a first input point on a high potential side of a direct current power supply. A second conversion circuit is electrically connected between the reference potential point and a second input point on a low potential side of the direct current power supply. A voltage-regulating circuit is configured to adjust a magnitude of an applied voltage to the first conversion circuit and the second conversion circuit. The voltage-regulating circuit is configured to increase the magnitude of the applied voltage over time during a start time period from a start of supplying power from the direct current power supply until a first capacitor and a second capacitor are charged to a specified voltage.
    Type: Grant
    Filed: April 17, 2015
    Date of Patent: October 31, 2017
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Kazunori Kidera, Mariko Kifuji
  • Patent number: 9748863
    Abstract: The cascaded multilevel inverter is considered to be a promising topology alternative for low-cost and high-efficiency photovoltaic (PV) systems. However, the leakage current issue, resulting from the stray capacitances between the PV panels and the earth, remains a challenge in the photovoltaic cascaded multilevel inverter application. The present invention presents leakage current suppression solutions for the PV cascaded multilevel inverter by introducing properly arranged and designed passive filters. The embodiments of the invention do not include an active semiconductor device, and as such, the leakage current suppression techniques of the present invention retain the simple structure of the cascaded inverter and do not complicate the associated control system.
    Type: Grant
    Filed: August 26, 2016
    Date of Patent: August 29, 2017
    Assignee: The Florida State University Research Foundation, Inc.
    Inventors: Yan Zhou, Hui Li
  • Patent number: 9722484
    Abstract: A noise filter circuit uses open loop signal processing to process the signal that causes the noise and generate a signal to be fed back into the system to cancel noise currents.
    Type: Grant
    Filed: August 5, 2013
    Date of Patent: August 1, 2017
    Assignee: NXP B.V.
    Inventors: Juergen Stahl, Thomas Antonius Duerbaum, Jens Goettle, Alexander Pawellek, Anton Cornelis Blom, Hans Halberstadt, Frans Pansier
  • Patent number: 9667128
    Abstract: Power conversion systems and methods are presented for detecting filter capacitor resonance conditions in a power conversion system in which filter currents are measured and filtered using a bandpass filter, and one or more computed mean, RMS, and/or Fourier transform values are computed based on the filtered value(s). The computed measurement value or values are compared with a predetermined threshold and a suspected filter capacitor resonance condition is selectively identified based on comparison result.
    Type: Grant
    Filed: August 9, 2012
    Date of Patent: May 30, 2017
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Yogesh Popatlal Patel, Lixiang Wei
  • Patent number: 9531296
    Abstract: The present invention provides a power conversion device in which an on-pulse bias voltage and a neutral-point bias voltage do not interfere with each other. A power conversion device 1 of the present invention has a polarity judgment section 8 that judges a polarity of a neutral-point bias voltage VNPC calculated by a neutral-point potential fluctuation suppression control section 4 of a voltage command value control circuit 3, then on the basis of this polarity of the neutral-point bias voltage VNPC, selects a polarity of an on-pulse bias voltage VMPC by an on-pulse control section 5. With this control, it is possible to prevent for the polarities of the neutral-point bias voltage VNPC and the on-pulse bias voltage VMPC from being different then prevent for the both bias voltages from interfering with each other.
    Type: Grant
    Filed: November 16, 2012
    Date of Patent: December 27, 2016
    Assignee: MEIDENSHA CORPORATION
    Inventors: Shota Urushibata, Masakazu Muneshima, Hui Zhang
  • Patent number: 9515577
    Abstract: There is provided a device including: an inverter 5 including switching elements 51-52 for outputting a U-phase voltage and switching elements 53-54 for outputting a W-phase voltage; midpoint capacitors 31-32; a midpoint stabilizer 2 configured to regulate a power storage amount of each of the midpoint capacitor 31 and the midpoint capacitor 32; and a controller 7 configured to control the switching elements 51-54 so as to supply a desired U-phase voltage and a desired W-phase voltage based on voltages between the U-phase voltage line and the neutral line and the voltage between the W-phase voltage line and the neutral line, and control the midpoint stabilizer 2 so as to adjust the midpoint potential in the O phase based on the condition of the midpoint potential in an O phase at a connecting point between the midpoint capacitor 31 and the midpoint capacitor 32.
    Type: Grant
    Filed: September 20, 2013
    Date of Patent: December 6, 2016
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Kazunori Kidera, Hideki Tamura, Ichirou Katou
  • Patent number: 9503013
    Abstract: To suppress a decline in the control accuracy of an applied voltage associated with an increase in quantum noise, and to increase the control accuracy of a motor speed. When generating a driving voltage signal supplied to a motor from a driving command signal, a motor-driving voltage control device reduces the gradation level and performs noise-shaping modulation before performing PWM modulation. Reducing the gradation level allows the degree of gradation of the driving voltage signal to be within the resolution range of the PWM modulation, and thus PWM modulation can be performed even when the driving voltage signal has a high frequency. Noise-shaping modulation reduces the level of quantum noise near the low frequency range by causing the quantum noise due to digitization, included in the driving voltage signal, to be biased toward the high frequency range side.
    Type: Grant
    Filed: December 12, 2013
    Date of Patent: November 22, 2016
    Assignee: Schaft Inc.
    Inventors: Junichi Urata, Masayuki Inaba
  • Patent number: 9473210
    Abstract: A power transmitting device includes a resonance circuit, a first signal generating unit, and a second signal generating unit. The resonance circuit is used in non-contact power transmission. The first signal generating unit is connected to one end of the resonance circuit, and generates, with the use of a switching system, a first high-frequency signal including one or more harmonic components. The second signal generating unit is connected to an other end of the resonance circuit, and generates, with the use of a switching system, a second high-frequency signal including a specific harmonic component. The first high-frequency signal is adjusted in pulse width and input to the one end of the resonance circuit, and the second high-frequency signal is adjusted in pulse width and phase difference from the first high-frequency signal and input to the other end of the resonance circuit.
    Type: Grant
    Filed: April 12, 2013
    Date of Patent: October 18, 2016
    Assignee: Sony Corporation
    Inventor: Shinji Komiyama
  • Patent number: 9461538
    Abstract: It is presented a DC/DC converter for converting power between a first DC connection comprising a first positive terminal and a first negative terminal, and a second DC connection comprising a second positive terminal and a second negative terminal. The DC/DC converter comprises: a first multilevel converter and a second multilevel converter connected serially between the first positive terminal and the first negative terminal, wherein the second positive terminal is connected to a point between the first multilevel converter and the second multilevel converter; and a first filter connected between an AC terminal of the first multilevel converter and an AC terminal of the second multilevel converter, wherein the first filter comprises a capacitor and an inductor.
    Type: Grant
    Filed: September 23, 2013
    Date of Patent: October 4, 2016
    Assignee: ABB TECHNOLOGY LTD
    Inventors: Kailash Srivastava, Roberto Alves, Michal Lazarczyk
  • Patent number: 9450512
    Abstract: A method for the operational control of an inverter designed for DC/AC voltage conversion that has at least one direct-voltage input and that can be connected to a power supply grid via at least one alternating-voltage output, the inverter being involved in a power flow interaction with the grid in such a manner that, during operation of the inverter, a leakage current IA can occur, wherein the leakage current IA is controlled in the operational control.
    Type: Grant
    Filed: October 5, 2012
    Date of Patent: September 20, 2016
    Assignee: SMA SOLAR TECHNOLOGY AG
    Inventors: Sven Bremicker, Karel De Brabandere, Tobias Mueller
  • Patent number: 9407135
    Abstract: A power conversion apparatus includes a power converter, an LC filter, and a controller. The power converter is disposed between an AC power source and a load. The LC filter is disposed between the AC power source and the power converter. The controller controls the power converter to perform power conversion control between the AC power source and the load. The controller includes a command generator, an oscillation component acquirer, a regulator, and an actuator. The command generator generates an input current command including a command of an input current of the power converter. The oscillation component acquirer acquires an oscillation component of a current flowing through a capacitor of the LC filter. The regulator regulates the input current command based on the oscillation component acquired by the oscillation component acquirer. The actuator controls the power converter based on the input current command regulated by the regulator.
    Type: Grant
    Filed: December 9, 2014
    Date of Patent: August 2, 2016
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Hirofumi Kinomura, Takahiro Saeki
  • Patent number: 9407169
    Abstract: A method and apparatus for generating AC power. In one embodiment, the apparatus comprises a DC/AC inversion stage capable of generating at least two of a single-phase output power, a two-phase output power, and a three-phase output power; and a conversion control module, coupled to the DC/AC inversion stage, for driving the DC/AC inversion stage to (i) generate the single-phase output power while an input power is less than a first threshold, and (ii) operate in burst mode while the input power satisfies a burst mode threshold.
    Type: Grant
    Filed: May 28, 2014
    Date of Patent: August 2, 2016
    Assignee: Enphase Energy, Inc.
    Inventor: Martin Fornage
  • Patent number: 9392676
    Abstract: A discharge lamp lighting device includes: a DC power supply unit that outputs a DC current; an inverter that sequentially generates, from the DC current output from the DC power supply unit, a current pulse whose current direction alternately changes to supply the current pulse to a discharge lamp; and a control unit that controls operations of the DC power supply unit and the inverter to adjust a waveform of the current pulse to be supplied to the discharge lamp, wherein the control unit changes a pulse width of the current pulse every pulse.
    Type: Grant
    Filed: August 27, 2010
    Date of Patent: July 12, 2016
    Assignee: Seiko Epson Corporation
    Inventor: Kazuo Okawa
  • Patent number: 9312779
    Abstract: A power converter, control apparatus and methods are presented for driving a permanent magnet motor or other load through a sine wave filter and a transformer, in which inverter output current is controlled using a current-frequency relationship to convert a desired frequency or speed value to a current setpoint, and the inverter output current is regulated to the current setpoint using a control algorithm with a bandwidth below the resonant frequency of the sine wave filter.
    Type: Grant
    Filed: March 24, 2015
    Date of Patent: April 12, 2016
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Jingbo Liu, Thomas Nondahl, Peter Schmidt, Semyon Royak
  • Patent number: 9298204
    Abstract: A load control device includes an input and an output connectable to an AC source and an AC load, respectively, with one or more supply lines each corresponding to a phase in the load connecting the input and output. Line-side switches are connected between a line terminal and load terminal, and floating-neutral side switches are connected to the load terminal at one end and at a common neutral connection at another end. A controller determines a direction of current flow on each of the supply lines, determines a switching pattern for each of the line-side switches and each of the floating-neutral side switches based on the determined direction of current flow, and causes each of the line-side switches and floating-neutral side switches to operate in an On condition or an Off condition according to the determined switching pattern, such that a controlled uninterrupted current is provided to the AC load.
    Type: Grant
    Filed: December 27, 2012
    Date of Patent: March 29, 2016
    Assignee: Eaton Corporation
    Inventors: Zeljko Radomir Jankovic, Vijay Bhavaraju, Bruno Patrice-Bernard Lequesne, Yakov Lvovich Familiant
  • Patent number: 9271432
    Abstract: A power conversion device includes an inverter that drives a motor; a fin that cools down the inverter; a first core including a through hole that allows passage of a positive side conductor that connects a power supply system and the inverter and a negative side conductor that grounds the inverter; a ground conductor that grounds the fin; a ground conductor that grounds a motor yoke via a capacitor; and a ground conductor including one end that is connected to the negative side conductor or the ground conductor and the other end that is grounded.
    Type: Grant
    Filed: September 30, 2011
    Date of Patent: February 23, 2016
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Ryo Yokozutsumi, Akihiro Murahashi, Takushi Jimichi, Satoshi Azuma, Yasuhiro Shiraki
  • Patent number: 9225256
    Abstract: An apparatus and method for controlling the delivery of power from a DC source to an AC grid includes an inverter configured to deliver power from the unipolar input source to the AC grid and an inverter controller. The inverter includes an input converter, an active filter, and an output converter. The inverter controller includes an input converter controller, an active filter controller and an output converter controller. The input converter controller is configured to control a current delivered by the input converter to a galvanically isolated unipolar bus of the inverter. The output converter is configured to control the output converter to deliver power to the AC grid. Additionally, the active filter controller is configured to control the active filter to supply substantially all the power that is deliver by the output controller to the AC grid at a grid frequency.
    Type: Grant
    Filed: July 8, 2013
    Date of Patent: December 29, 2015
    Assignee: SUNPOWER CORPORATION
    Inventors: Patrick L. Chapman, Brian T. Kuhn, Robert S. Balog, Jonathan W. Kimball, Philip T. Krein, Alexander Gray, Trishan Esram
  • Patent number: 9215807
    Abstract: The described embodiments relate generally to electronic components and more specifically to a capacitor array that can increase component density on a printed circuit board and reduce a distance to a ground plane. An array of capacitors can be formed by coupling a group of capacitors on their sides interspersed with interposer boards. The resulting configuration can increase component density and reduce an amount of resistance and effective series inductance between a set of power decoupling capacitors and an integrated circuit.
    Type: Grant
    Filed: September 25, 2012
    Date of Patent: December 15, 2015
    Assignee: Apple Inc.
    Inventors: Shawn X. Arnold, Jeffrey M. Thoma
  • Patent number: 9184158
    Abstract: A semiconductor device includes: a semiconductor substrate; a diode-built-in insulated-gate bipolar transistor having an insulated-gate bipolar transistor and a diode, which are disposed in the substrate, wherein the insulated-gate bipolar transistor includes a gate, and is driven with a driving signal input into the gate; and a feedback unit for detecting current passing through the diode. The driving signal is input from an external unit into the feedback unit. The feedback unit passes the driving signal to the gate of the insulated-gate bipolar transistor when the feedback unit detects no current through the diode, and the feedback unit stops passing the driving signal to the gate of the insulated-gate bipolar transistor when the feedback unit detects the current through the diode.
    Type: Grant
    Filed: January 15, 2015
    Date of Patent: November 10, 2015
    Assignee: DENSO CORPORATION
    Inventor: Kenji Kouno
  • Patent number: 9172271
    Abstract: According to one aspect, embodiments of the invention provide a method of operating a UPS system having a first UPS and a second UPS coupled in parallel to provide output power to a load from a power source, each of the first UPS and the second UPS having an inverter and having a bypass switch, with each UPS configured to operate in one of an inverter mode in which output power is derived from the power source through the inverter, and a bypass mode in which output power is derived from the power source bypassing the inverter, the method comprising powering on the first UPS and the second UPS in the inverter mode of operation, designating one of the first UPS and the second UPS as a master UPS, and controlling the bypass switch of the first UPS and the bypass switch of the second UPS using the master UPS.
    Type: Grant
    Filed: September 19, 2011
    Date of Patent: October 27, 2015
    Assignee: SCHNEIDER ELECTRIC IT CORPORATION
    Inventors: Mirza Akmal Beg, Eyob Demissie, Venkatraman Chennakesavan, Michael J. Ingemi
  • Patent number: 9130542
    Abstract: A noise filter disclosed herein is configured to suppress a common mode voltage that is generated in cables connected to an electric power converter. The noise filter includes: detecting capacitors connected to the cables, respectively, and configured to detect the common mode voltage; an operational amplifier having a positive input terminal via which the common mode voltage detected by the detecting capacitors is inputted; an emitter follower circuit having an input terminal connected to an output terminal of the operational amplifier and having an output terminal connected to a negative input terminal of the operational amplifier; and a transformer configured to apply a compensating voltage to each of the cables by applying a voltage at the output terminal of the emitter follower circuit to each of the cables in opposite phase.
    Type: Grant
    Filed: February 5, 2015
    Date of Patent: September 8, 2015
    Assignee: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Yoshiaki Ishihara, Kazuji Yamazaki, Naoto Kikuchi, Yoshitoshi Watanabe
  • Patent number: 9118270
    Abstract: A motor control device includes a rectifier, an inverter connected to the rectifier via the DC link, a power failure detecting unit detecting power failure, a voltage detecting unit detecting a DC voltage at the DC link, an electric storage unit storing DC power, a charging unit that can make charging by boosting to a voltage higher than the DC voltage, a discharging unit discharging DC power, a resistance discharge device that performs resistance discharging of DC power at the DC link when the DC voltage after power failure is equal to or higher than a predetermined start level and that does not perform resistance discharging when the DC voltage is equal to or lower than a predetermined stop level, and a discharging operation determining unit operating the discharging unit when the DC voltage at the DC link after power failure is equal to or lower than a predetermined threshold.
    Type: Grant
    Filed: January 28, 2014
    Date of Patent: August 25, 2015
    Assignee: Fanuc Corporation
    Inventors: Masakazu Niwa, Kenta Yamamoto
  • Patent number: 9082540
    Abstract: The present invention relates to a common mode filter and a method of manufacturing the same. In order to implement a common mode filter with low shrinkage, high substrate sintered density, and high strength, the present invention provides a common mode filter including: a lower substrate; an insulating layer having a conductor pattern inside and provided on the lower substrate; an upper substrate provided on the insulating layer; and a ferrite core made of ferrite and provided in the center of the insulating layer, the lower substrate, and the upper substrate by penetrating the insulating layer, the lower substrate, and the upper substrate, and a method of manufacturing the same.
    Type: Grant
    Filed: March 23, 2012
    Date of Patent: July 14, 2015
    Assignee: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Yong Suk Kim, Sung Kwon Wi, Jeong Bok Kwak, Sang Moon Lee, Won Chul Sim, Young Seuck Yoo
  • Patent number: 9054625
    Abstract: This disclosure relates to a variable speed drive for driving a single phase motor. The variable speed drive generates enhanced motor voltages including harmonic components configured to reduce torque pulsations.
    Type: Grant
    Filed: March 11, 2011
    Date of Patent: June 9, 2015
    Assignee: Franklin Electric Co., Inc.
    Inventors: James H. Spreen, Jonathan D. Northup
  • Patent number: 9042134
    Abstract: Disclosed is a grid-connected inverter and a method for filtering AC output thereof. The grid-connected inverter includes an AC output filter which includes two or more switchable filtering modules, with the power capacity of each filtering module corresponding to a different output power of the grid-connected inverter; a monitoring module which is used to perform realtime monitoring on voltage and current outputted by the grid-connected inverter; and a control circuit which is used to calculate an output power grade of the grid-connected inverter according to the voltage and the current monitored by the monitoring module and control switching to the filtering module having a corresponding power capacity according to the power grade, the power grade being selected from a plurality of power grades which are divided according to power capacities of the filtering modules.
    Type: Grant
    Filed: May 5, 2011
    Date of Patent: May 26, 2015
    Assignees: TBEA SUNOASIS CO., LTD., TBEA XI'AN ELECTRIC TECHNOLOGY CO., LTD.
    Inventors: Weizeng Liu, Shaohua Ruan, Xintao Zhang
  • Patent number: 9036389
    Abstract: A system for controlling photovoltaic electricity production equipment having photovoltaic modules each equipped with a DC/DC microconverter connected to a DC bus, a DC bus manager, and an inverter for converting the direct current from the photovoltaic panels into alternative current intended for an electrical distribution network. Power is injected into the DC bus when the voltage of the DC bus is less than a minimum voltage until the minimum voltage is reached. Each of the microconverters injects a maximum power from the photovoltaic modules into the DC bus when the voltage of the DC bus is between a first voltage and a second voltage. The injecting of power from the photovoltaic modules into the DC bus is stopped when the voltage of the DC bus is less than a low threshold voltage or greater than a high threshold voltage.
    Type: Grant
    Filed: May 18, 2012
    Date of Patent: May 19, 2015
    Assignee: Schneider Electric Industries SAS
    Inventors: Jacques Ecrabey, Christian Petit, Yves Jeanjean, Antonio Almeida
  • Patent number: 9036371
    Abstract: A contactless power supply has a dynamically configurable tank circuit powered by an inverter. The contactless power supply is inductively coupled to one or more loads. The inverter is connected to a DC power source. When loads are added or removed from the system, the contactless power supply is capable of modifying the resonant frequency of the tank circuit, the inverter frequency, the inverter duty cycle or the rail voltage of the DC power source.
    Type: Grant
    Filed: November 10, 2009
    Date of Patent: May 19, 2015
    Assignee: Access Business Group International LLC
    Inventor: David W. Baarman
  • Patent number: 9030852
    Abstract: A power conversion device according to the aspects of the present technique is presented. The device includes a first converter and a second converter operatively coupled to the first converter. Moreover, the device includes a phase leg operatively coupled between the first converter, the second converter, where the phase leg includes a first unidirectional switch, a second unidirectional switch operatively coupled to the first unidirectional switch, and a first bidirectional switch, where a first end of the first bidirectional switch is operatively coupled to at least one of the first unidirectional switch and the second unidirectional switch.
    Type: Grant
    Filed: May 31, 2012
    Date of Patent: May 12, 2015
    Assignee: General Electric Company
    Inventors: Piniwan Thiwanka Bandara Wijekoon, Said Farouk Said El-Barbari
  • Patent number: 9030854
    Abstract: An exemplary method and an apparatus implementing the method for an arrangement having a three-phase, multi-level inverter, an output LCL-filter connecting the inverter to a grid, and a virtual-ground connection between the LCL-filter and the neutral point of the DC-link. The method includes determining a zero-sequence component of an LCL-filter inverter-side current, calculating a zero-sequence damping and balancing voltage term based on the LCL-filter inverter-side current zero-sequence component and voltages over the two halves of the DC-link, and adding the zero-sequence damping and voltage balancing term to the output voltage reference.
    Type: Grant
    Filed: June 7, 2013
    Date of Patent: May 12, 2015
    Assignee: ABB Research Ltd
    Inventors: Gerardo Escobar, Sami Pettersson, Ngai-Man Ho
  • Publication number: 20150123479
    Abstract: A power conversion apparatus is applied to a filter circuit. A reactor of the filter circuit includes a vertical pair of yoke iron cores, in each of which a thin strip of magnetic material is rolled in a toroidal manner and magnetic leg iron cores having respective phases being a pillar formed of thin-strip shaped magnetic material, being provided on a symmetrical position on a circumference with respect to a center of the yoke iron cores, connecting the vertical pair of the yoke iron cores, and providing a coil. The reactor also includes magnetic leg iron cores for zero-phase impedance having the respective phases, each having a rectangular parallelepiped shape in which a plurality of thin strips made of magnetic material are laminated in a direction toward a periphery from the center of the yoke iron cores and being provided between the magnetic leg iron cores.
    Type: Application
    Filed: August 28, 2012
    Publication date: May 7, 2015
    Applicant: HITACHI, LTD.
    Inventor: Naoyuki Kurita
  • Publication number: 20150115797
    Abstract: When RF power is supplied from an RF generator to a load via a power supply unit, (a) the internal impedance of the RF generator is made lower than the characteristic impedance of the power supply unit, and (b) the load-end voltage is increased by selecting the electrical length LE of the power supply unit, which connects between the RF generator and the load to supply RF power, so that the electrical length LE has a predetermined relation with the fundamental wavelength ? of the RF AC. More specifically, the electrical length LE of the power supply unit is selected in such a way that, when the load end, which is the input end of the load, is in an open state, the electrical length LE is (2n?1)·(?/4)?k·??LE?(2n?1)·(?/4)+k·? (n is an integer, k is {??2·cos?1(1/K)}/(4?)) with respect to the fundamental wavelength ? of the RF AC.
    Type: Application
    Filed: June 3, 2013
    Publication date: April 30, 2015
    Applicant: KYOSAN ELECTRIC MFG. CO., LTD.
    Inventors: Itsuo Yuzurihara, Satoshi Aikawa, Hiroshi Kunitama
  • Patent number: 9019736
    Abstract: A DC-to-AC power conversion system is provided to convert a DC input voltage into an AC output voltage, which mainly includes a bridge switching circuit, an auxiliary switch circuit, and a control circuit. The bridge switching circuit has a first power switch, a second power switch, a third power switch, and a fourth power switch. The auxiliary switch circuit has a fifth power switch, a sixth power switch, a seventh power switch, and an eighth power switch. The control circuit produces a complementary switching signal pair to control the first and fourth power switches and the second and third power switches, respectively. In addition, the control circuit produces a complementary level signal pair to control the sixth and seventh power switches and the fifth and eighth power switches, respectively.
    Type: Grant
    Filed: July 12, 2013
    Date of Patent: April 28, 2015
    Assignee: Delta Electronics, Inc.
    Inventors: Lei-Ming Lee, Chen-Wei Ku, Ho Huang
  • Patent number: 9013895
    Abstract: A contactless power supply has a dynamically configurable tank circuit powered by an inverter. The contactless power supply is inductively coupled to one or more loads. The inverter is connected to a DC power source. When loads are added or removed from the system, the contactless power supply is capable of modifying the resonant frequency of the tank circuit, the inverter frequency, the inverter duty cycle or the rail voltage of the DC power source.
    Type: Grant
    Filed: July 27, 2011
    Date of Patent: April 21, 2015
    Assignee: Access Business Group International LLC
    Inventor: David W. Baarman
  • Patent number: 9007792
    Abstract: An arrangement transmits power between a DC power line and an AC power line carrying a voltage having a number of phases. The arrangement includes a number of transformers, one for each phase and a number of power transfer modules, one for each phase, connected in series between the DC power line and ground, where each module includes a first branch including series connected converter cells and a second branch including series connected switching elements. The primary winding of a transformer is connected to a corresponding AC phase conductor of the AC power line and the secondary winding is connected between a midpoint of the first branch and a midpoint of the second branch of a corresponding power transfer module.
    Type: Grant
    Filed: October 15, 2010
    Date of Patent: April 14, 2015
    Assignee: ABB Technology AG
    Inventors: Subhasish Mukherjee, Tomas Jonsson, Sasitharan Subramanian
  • Patent number: 8994318
    Abstract: An electrical on-board network of a vehicle, having at least two power circuits and an electrical machine allocated to a drive of the vehicle. The electrical machine has at least two phase systems, connected to a respective inverter, and that at least one of the phase systems is capable of being electrically connected to at least one of the power circuits via the associated inverter. A method for operating an electrical on-board network of a vehicle is also described.
    Type: Grant
    Filed: January 20, 2011
    Date of Patent: March 31, 2015
    Assignee: Robert Bosch GmbH
    Inventors: Jochen Kurfiss, Sven Finke
  • Publication number: 20150070947
    Abstract: A method is provided for balancing voltages of a DC link of a multi-level inverter, where the DC link is divided into two halves by a neutral point connection. The method includes injecting a periodic common-mode voltage injection signal to a common-mode voltage reference and a periodic power injection signal to a power reference of the inverter. The power injection signal has the same frequency as the common-mode voltage injection signal. A phase shift between the common-mode voltage injection signal and the power injection signal is constant. The amplitude of at least one of the common-mode voltage injection signal and the power injection signal is controlled on the basis of a difference between voltages over the two halves of the DC link. An apparatus is also provided for implementing the method.
    Type: Application
    Filed: September 5, 2014
    Publication date: March 12, 2015
    Inventor: Samuli HEIKKILÄ
  • Publication number: 20150070948
    Abstract: A system includes power electronics inverters connected in a network. The power electronics inverters can utilize measurements at local terminals, without a need to exchange information between other power electronics inverters.
    Type: Application
    Filed: August 4, 2014
    Publication date: March 12, 2015
    Inventors: Brian Johnson, Sairaj Dholpe, Abdullah Hamadeh, Philip Krein
  • Patent number: 8970063
    Abstract: An arrangement which includes two or more energy storage units for electrical energy connected in series, and two or more balancing resistor units. Each balancing resistor unit is connected in parallel with one of the energy storage units. The arrangement also includes means for determining a voltage over all of the series-connected energy storage units and means for determining the energy storage unit voltages between poles of the energy storage units. One or more of the balancing resistor units include a base resistor unit and a control resistor unit connected in series and a switching device connected in parallel with the control resistor units.
    Type: Grant
    Filed: June 2, 2011
    Date of Patent: March 3, 2015
    Assignee: ABB Oy
    Inventor: Ora Veli-Matti Leppänen
  • Patent number: 8971066
    Abstract: A current control unit takes a deviation between a current command value and a current flowing through an inverter of a power conversion device, and controls the inverter based on the deviation. A harmonic sensing part receives input of an output current of an AC filter, and outputs a predetermined order harmonic of the input current in a direct current value form. A disturbance observer estimates the disturbance of the harmonic based on the output current and a coefficient defined as an inverse function of a transfer function from harmonic suppression current command value to filter output current detection value. A harmonic suppression control unit takes the deviation between the estimated harmonic disturbance and a disturbance command value that suppresses the disturbance, and calculates a harmonic suppression current command value. The harmonic suppression current command value is superimposed on the current command value of the current control unit.
    Type: Grant
    Filed: August 5, 2011
    Date of Patent: March 3, 2015
    Assignee: Meidensha Corporation
    Inventors: Kazunobu Oi, Yugo Tadano