Transistor Type Patents (Class 363/163)
  • Patent number: 10218277
    Abstract: Increased DC-to-AC power conversion efficiency in a scalable, flexible, resilient, cascading inverter driver topology. Plural power cells, which include a rectifier and an inverter, are arranged in a series/parallel topology. Use of plural power cells increases efficiency by reducing voltage transition losses and by increasing duty cycle. Also, the power cells output AC to an electric motor using a forward-looking controller that responds to varying power demand while maintaining motor speed at a maximum efficiency level. Power output is varied by varying the width of rectifier output pulses to the inverters while maintaining pulse voltage. Transitions between power levels are smoothed by pulse density modulation. Pulse density, determined automatically in the inverter, begins high and gradually becomes less dense so voltage changes rapidly then slowing gradually. The topology and power cell components allow faulty power cells 10 to be isolated and bypassed.
    Type: Grant
    Filed: February 22, 2016
    Date of Patent: February 26, 2019
    Assignee: The Boeing Company
    Inventors: Michael A. Carralero, Jimmy M. Quiambao, James L. Peck
  • Patent number: 10141440
    Abstract: Apparatus and associated methods relate to controlling an electric field profile within a drift region of an LDMOS device using biased field plates to deplete majority carriers from a drift region between a body/drift-region metallurgical junction and a drain contact. Such field plates are located in trenches that longitudinally extend within the drift region. Field plates are laterally spaced apart from each other at a distance that permits substantial depletion of majority carriers between adjacent field plates. Trenches have trench bottoms located within a drift-region/substrate metallurgical junction so as to permit substantial depletion of majority carriers between trench bottoms and the drift-region/substrate metallurgical junction. Between adjacent trenches, dopant concentrations can be increased up to a threshold that can be substantially depleted under specified bias conditions.
    Type: Grant
    Filed: March 9, 2016
    Date of Patent: November 27, 2018
    Assignee: Polar Semiconductor, LLC
    Inventors: Steven Kosier, Thomas Chung
  • Patent number: 9859820
    Abstract: A converter having at least one converter module, which includes a primary circuit connected to a power supply, a secondary circuit connected to a load, and a DC link circuit having an intermediate circuit capacitance, is operated according to the disclosed method by controlling the primary circuit such that the intermediate circuit voltage dropping across the intermediate circuit capacitance is adjusted to a predetermined desired voltage value which depends on the direction of the power flow in the secondary circuit.
    Type: Grant
    Filed: January 16, 2014
    Date of Patent: January 2, 2018
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventor: Hubert Schierling
  • Patent number: 9800167
    Abstract: A step-down AC/AC converter for use in an electric distribution system includes at least one chopper circuit for each one of a plurality of phases of the AC power, each chopper circuit including a four-quadrant switch coupled in series between primary and secondary sides of the chopper circuit and a current-bidirectional two-quadrant switch coupled between the secondary side of the chopper circuit and a common node. Each current-bidirectional two-quadrant switch is oriented in the same direction, with respect to the secondary side of the corresponding chopper circuit and the common node. The converter further includes a control circuit configured to pulse-width-modulate control inputs of the switches, to convert a first multiphase AC voltage at the primary sides of the chopper circuits to a second multiphase AC voltage at the secondary sides of the chopper circuits, the second multiphase AC voltage being lower in voltage than the first multiphase AC voltage.
    Type: Grant
    Filed: February 7, 2014
    Date of Patent: October 24, 2017
    Assignee: ABB Schweiz AG
    Inventors: Eddy C. Aeloiza, Rolando P. Burgos
  • Patent number: 9762118
    Abstract: The present invention discloses a lossless snubber circuit and an operation method thereof. The lossless snubber circuit includes a first snubber circuit. The first snubber circuit includes a first diode (D7) and a capacitor (C3). The capacitance of the capacitor (C3) is big enough so that a voltage spike generated at the moment when a switch transistor (Q1) is turned off is depressed by charging the capacitor (C3). When the switch transistor (Q1) is on, the electric charges released by the capacitor (C3) are directed to a first capacitor (C1) in a three-phase Vienna structure, so as to avoid the problem of voltage stress difference caused by the large quantity of electric charges released by the capacitor (C3) flowing back to the switch transistor (Q1).
    Type: Grant
    Filed: August 2, 2013
    Date of Patent: September 12, 2017
    Assignee: VERTIV ENERGY SYSTEMS, INC.
    Inventor: Meng Wang
  • Patent number: 9112414
    Abstract: Provided is a matrix converter including a power converter, a commutation controller, and a compensator. The power converter includes a plurality of bidirectional switches. The commutation controller performs one of a three-step commutation operation and a four-step commutation operation by the bidirectional switches as a switch source and the bidirectional switches as a switch destination when an input terminal to be connected to an output terminal is switched by on/off control of the bidirectional switches. The compensator compensates for an output voltage error generated when the input terminal to be connected to the output terminal is switched, based on a potential difference before and after the switching of the input terminal to be connected to the output terminal, an output current of the output terminal, and capacitance between input and output terminals of unidirectional switches.
    Type: Grant
    Filed: March 11, 2014
    Date of Patent: August 18, 2015
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Kentaro Inomata, Shinya Morimoto, Mamoru Takaki, Yoshiyasu Takase
  • Publication number: 20150085552
    Abstract: A matrix converter includes a power converter and a controller. The power converter includes bidirectional switches each having a conducting direction controllable by switching elements. The bidirectional switches are disposed between input terminals coupled to phases of an AC power source and output terminals coupled to phases of a load. A first commutation controller performs commutation control based on a first commutation. A second commutation controller performs the commutation control based on a second commutation. A selector selects between the first and second commutation controllers and to perform the commutation control based on a vector of an output current or an output voltage from the power converter or a vector of an input voltage or an input current from the AC power source to the power converter.
    Type: Application
    Filed: September 25, 2014
    Publication date: March 26, 2015
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Kentaro INOMATA, Shinya MORIMOTO
  • Publication number: 20150085553
    Abstract: A matrix converter includes: a power convertor that includes a plurality of bidirectional switches; and a controller configured to control the plurality of bidirectional switches. The controller includes: a first commutation controller configured to perform a commutation control with a first commutation method; a second commutation controller configured to perform a commutation control with a second commutation method different from the first commutation method; and a selector configured to select a commutation controller that is configured to execute a commutation control from the first commutation controller and the second commutation controller based on any one of a phase of an output electric current from the power convertor and a phase of an input voltage to the power convertor.
    Type: Application
    Filed: September 25, 2014
    Publication date: March 26, 2015
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Hirofumi KINOMURA, Joji EBISU
  • Publication number: 20150085551
    Abstract: A matrix converter includes a power converter and a controller. The power converter includes bidirectional switches each having a controllable conducting direction. The bidirectional switches are disposed between input terminals and output terminals. The input terminals are respectively coupled to phases of an AC power source. The output terminals are respectively coupled to phases of a load. The controller controls the bidirectional switches. A first commutation controller performs commutation control when the conducting direction is unidirectional. A second commutation controller performs the commutation control when the conducting direction is bidirectional. A selector selects between the first commutation controller and the second commutation controller to perform the commutation control based on a state of an output current from the power converter.
    Type: Application
    Filed: September 25, 2014
    Publication date: March 26, 2015
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventor: Kentaro INOMATA
  • Publication number: 20150003136
    Abstract: A matrix converter according to an embodiment includes a voltage command corrector and a drive signal generator. The voltage command corrector corrects the magnitude of an output voltage command on the basis of amplitude variations of an input current from an AC power supply to a power converter, the amplitude variations being caused by a ripple component of the input current. The drive signal generator generates drive signals that turn ON/OFF a plurality of bidirectional switches on the basis of the output voltage command corrected by the voltage command corrector.
    Type: Application
    Filed: June 12, 2014
    Publication date: January 1, 2015
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Kentaro INOMATA, Hidenori HARA, Takahiro UCHINO
  • Publication number: 20140355318
    Abstract: A method of controlling a frequency converter comprises steps for measuring phase currents flowing in a three-phase supply network, for generating a first modulation space vector that comprises an angle that is synchronous to a supply voltage of the three-phase supply network and a determined modulation index as an amplitude, for generating a third modulation space vector depending on the first modulation space vector and the measured phase currents and for modulating the frequency converter according to the third modulation space vector.
    Type: Application
    Filed: August 20, 2014
    Publication date: December 4, 2014
    Inventor: Jens Onno Krah
  • Patent number: 8848410
    Abstract: A matrix converter includes input terminals, output terminals, a power conversion circuit, and a snubber circuit. The power conversion circuit includes bidirectional switches of which each includes antiparallel connection circuits connected serially. The snubber circuit is connected to the bidirectional switches. The snubber circuit includes first diodes, a capacitor, a second diode, and third diodes. The first diodes are respectively corresponded to the bidirectional switches. A first connecting point of each the first diode is connected to a connection point between the two unidirectional switching elements constituting the bidirectional switch. A first connecting point of the capacitor is connected to a second connecting point of each the first diode. First and second connecting points of the second diode are connected to a second connecting point of the capacitor and the corresponding output terminal. The bidirectional switches, the first diodes, and the second diode are arranged in one power module.
    Type: Grant
    Filed: October 21, 2013
    Date of Patent: September 30, 2014
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Takahiro Uchino, Ryo Ohira
  • Publication number: 20140268970
    Abstract: A matrix converter according to an embodiment includes a power converter having a plurality of bidirectional switches, a controller, and a current detector. The controller controls the power converter. The correct detector detects a current flowing to an output side of the power converter. The controller extracts a high-frequency component contained in the current detected by the current detector, adjusts an output current reference on the basis of the high-frequency component, and controls the power converter on the basis of the adjusted output current reference.
    Type: Application
    Filed: May 28, 2014
    Publication date: September 18, 2014
    Applicants: KABUSHIKI KAISHA YASKAWA DENKI, National University Corporation Nagaoka University of Technology
    Inventors: Takashi TANAKA, Eiji YAMAMOTO, Jun-ichi ITOH, Hiroki TAKAHASHI
  • Publication number: 20140254230
    Abstract: Provided is a matrix converter including a power converter, a commutation controller, and a compensator. The power converter includes a plurality of bidirectional switches. The commutation controller performs one of a three-step commutation operation and a four-step commutation operation by the bidirectional switches as a switch source and the bidirectional switches as a switch destination when an input terminal to be connected to an output terminal is switched by on/off control of the bidirectional switches. The compensator compensates for an output voltage error generated when the input terminal to be connected to the output terminal is switched, based on a potential difference before and after the switching of the input terminal to be connected to the output terminal, an output current of the output terminal, and capacitance between input and output terminals of unidirectional switches.
    Type: Application
    Filed: March 11, 2014
    Publication date: September 11, 2014
    Applicant: Kabushiki Kaisha Yaskawa Denki
    Inventors: Kentaro INOMATA, Shinya MORIMOTO, Mamoru TAKAKI, Yoshiyasu TAKASE
  • Patent number: 8830713
    Abstract: A method and apparatus are provided for operating a converter circuit, which includes n input phase connections and p output phase connections, where n?2 and p?2, and (n·p) two-pole switching cells for switching at least one positive and negative voltages between the poles. Power semiconductor switches of the switching cells are driven a drive signal. To reduce undesired circulating currents and adjust the mean voltage deviation of capacitive energy storage of all the switching cells to zero, an inductance is connected into each series connection, with a switching cell together with an inductance in each case forming a phase module. For each phase module, the drive signal is formed from a reference signal based on the voltage across the phase module and from a voltage signal across the inductance. The voltage signal is formed from an intermediate setpoint value of the current through the phase module.
    Type: Grant
    Filed: June 1, 2012
    Date of Patent: September 9, 2014
    Assignee: ABB Schweiz AG
    Inventor: Arthur Korn
  • Publication number: 20140198550
    Abstract: An apparatus is provided. A differential pair of transistors is configured to receive a first differential signal having a first frequency, and a transformer, having a primary side and a secondary side is provided. The primary side of the transformer is coupled to the differential pair of transistors, and the secondary side of the transformer is configured to output a second differential signal having a second frequency, where the second frequency is greater than the first frequency. A first transistor is coupled to the first supply rail, the primary side of the transformer, and the differential pair of transistors, where the first transistor is of a first conduction type. A second transistor is coupled to the second supply rail, the primary side of the transformer, and the differential pair of transistors, where the second transistor is of a second conduction type.
    Type: Application
    Filed: January 14, 2013
    Publication date: July 17, 2014
    Applicant: Texas Instruments Incorporated
    Inventors: Swaminathan Sankaran, Vijaya B. Rentala, Brian B. Ginsburg, Srinath M. Ramaswamy, Eunyoung Seok, Baher Haroun, Bradley A. Kramer, Hassan Ali, Nirmal C. Warke
  • Patent number: 8760899
    Abstract: An apparatus is provided. A differential pair of transistors is configured to receive a first differential signal having a first frequency, and a transformer, having a primary side and a secondary side is provided. The primary side of the transformer is coupled to the differential pair of transistors, and the secondary side of the transformer is configured to output a second differential signal having a second frequency, where the second frequency is greater than the first frequency. A first transistor is coupled to the first supply rail, the primary side of the transformer, and the differential pair of transistors, where the first transistor is of a first conduction type. A second transistor is coupled to the second supply rail, the primary side of the transformer, and the differential pair of transistors, where the second transistor is of a second conduction type.
    Type: Grant
    Filed: January 14, 2013
    Date of Patent: June 24, 2014
    Assignee: Texas Instruments Incorporated
    Inventors: Swaminathan Sankaran, Vijaya B. Rentala, Brian B. Ginsburg, Srinath M. Ramaswamy, Eunyoung Seok, Baher Haroun, Bradley A. Kramer, Hassan Ali, Nirmal C. Warke
  • Publication number: 20140159481
    Abstract: An electronic circuit comprising a direct current interface at which a direct current is providable, an alternating current interface at which an alternating current is providable, a set of switchable half-bridges coupled to the direct current interface, each half-bridge comprising two blocks each having a switch and a diode, a control entity configured for switching the switches of the half-bridges with a predefined relative phase shift between different half-bridges, and a filter entity arranged between the alternating current interface and a plurality of parallel paths relating to the plurality of half-bridges wherein the filter entity comprises a coupled inductor inductively coupling the plurality of parallel paths.
    Type: Application
    Filed: June 1, 2012
    Publication date: June 12, 2014
    Applicant: FH JOANNEUM GMBH
    Inventor: Hubert Berger
  • Patent number: 8599577
    Abstract: Systems and methods are provided for delivering energy using an energy conversion module. An exemplary method for delivering energy from an input interface to an output interface using an energy conversion module coupled between the input interface and the output interface comprises the steps of determining an input voltage reference for the input interface based on a desired output voltage and a measured voltage at the output interface, determining a duty cycle control value based on a ratio of the input voltage reference and the measured voltage, operating one or more switching elements of the energy conversion module to deliver energy from the input interface to the output interface with a duty cycle influenced by the duty cycle control value.
    Type: Grant
    Filed: November 8, 2010
    Date of Patent: December 3, 2013
    Assignee: GM Global Technology Operations LLC
    Inventors: Lateef A. Kajouke, Milun Perisic, Ray M. Ransom
  • Patent number: 8587962
    Abstract: Systems and methods are provided for delivering energy from an input interface to an output interface. An electrical system includes an input interface, an output interface, an energy conversion module between the input interface and the output interface, an inductive element between the input interface and the energy conversion module, and a control module. The control module determines a compensated duty cycle control value for operating the energy conversion module to produce a desired voltage at the output interface and operates the energy conversion module to deliver energy to the output interface with a duty cycle that is influenced by the compensated duty cycle control value. The compensated duty cycle control value is influenced by the current through the inductive element and accounts for voltage across the switching elements of the energy conversion module.
    Type: Grant
    Filed: November 8, 2010
    Date of Patent: November 19, 2013
    Assignee: GM Global Technology Operations LLC
    Inventors: Milun Perisic, Ray M. Ransom, Lateef A. Kajouke
  • Patent number: 8559193
    Abstract: Method for operating an ac/ac converter circuit for a high-frequency-link converter. The ac/ac converter circuit converts an ac input voltage to an ac output voltage. When the ac input voltage is zero, each of a pair of switches for both first and second arms are caused to be on. Current flows through the first arm along a first direction and through the second arm along a second, opposite direction. Next, when the ac input voltage is zero, a selected switch in the second arm is caused to be turned off. The position of the switches can be maintained as the ac input voltage transitions to a dc level, reaches the dc level, approaches zero, and again reaches zero. When the ac input voltage again reaches zero, the selected switch for the second arm is caused to be turned on.
    Type: Grant
    Filed: January 22, 2011
    Date of Patent: October 15, 2013
    Assignee: The Board of Trustees of the University of Illinois
    Inventor: Sudip K. Mazumder
  • Patent number: 8462528
    Abstract: Systems and methods are provided for delivering energy using an energy conversion module that includes one or more switching elements. An exemplary electrical system comprises a DC interface, an AC interface, an isolation module, a first conversion module between the DC interface and the isolation module, and a second conversion module between the AC interface and the isolation module. A control module is configured to operate the first conversion module to provide an injection current to the second conversion module to reduce a magnitude of a current through a switching element of the second conversion module before opening the switching element.
    Type: Grant
    Filed: July 19, 2010
    Date of Patent: June 11, 2013
    Assignee: GM Global Technology Operations LLC
    Inventors: Lateef A. Kajouke, Milun Perisic, Ray M. Ransom
  • Patent number: 8446741
    Abstract: A power supply includes a power source having at least one power source output, and a plurality of drivers connected to the at least one power source output. At least one of the plurality of drivers includes a bridge network having a first switch, a second switch and a bridge network output. The first switch is connected between the at least one power source output and the bridge network output. The second switch is connected between the bridge network output and a ground. The bridge network further includes at least one control input connected to the second switch. The bridge network is adapted to change a state of the first switch based on a state of the second switch.
    Type: Grant
    Filed: July 25, 2011
    Date of Patent: May 21, 2013
    Inventors: Laurence P. Sadwick, Ruey-Jen Hwu, Mohammad M. Mojarradi
  • Patent number: 8397085
    Abstract: A power supply includes multiple power cells and a master control system in communication with each of the power cells. The master controller includes a control processor configured to receive power cell control information and a host in communication with the control processor wherein the host is configured to receive command and status information.
    Type: Grant
    Filed: September 23, 2008
    Date of Patent: March 12, 2013
    Assignee: Siemens Industry, Inc.
    Inventors: James A. Buckey, Ralph R. Flaugher
  • Patent number: 8243482
    Abstract: A control device for a matrix converter includes an input voltage detector, an output current detector, a pulse width modulator, and an input voltage command calculator. The input voltage detector is configured to detect an input voltage of the matrix converter. The output current detector is configured to detect an output current of the matrix converter. The pulse width modulator is configured to generate a PWM pulse command signal by using the input voltage, the output current, and an output line voltage command. The input voltage command calculator is configured to calculate an input voltage command of the matrix converter.
    Type: Grant
    Filed: November 30, 2010
    Date of Patent: August 14, 2012
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Yozo Ueda, Ryuji Suenaga, Eiji Watanabe
  • Publication number: 20120201056
    Abstract: Power conversion systems are presented with common mode reduction by space vector pulse width modulation zero vector selection to counteract common mode contribution of active vectors.
    Type: Application
    Filed: February 9, 2011
    Publication date: August 9, 2012
    Applicant: ROCKWELL AUTOMATION TECHNOLOGIES, INC.
    Inventors: Lixiang Wei, Zhongyuan Cheng, Yuan Xiao, Navid R. Zargari
  • Patent number: 8080958
    Abstract: A power conversion device includes a main circuit that has switches connecting each phase of a three-phase AC power supply to each output phase, an LC filter having a reactor and a capacitor connected between the three-phase AC power supply and each bidirectional switch, and a current detector detecting an input current or a load current, and a four-step commutation device generating four steps on the basis of the polarity of the load current. The four-step commutation device sets times between the steps to a value more than zero so as to inhibit open circuit between output phases and short circuit between power supply phases, and sets the times between the steps in accordance with the polarity of the load current so as to cancel a distortion of an output voltage due to four-step commutation during a PWM cycle.
    Type: Grant
    Filed: September 4, 2009
    Date of Patent: December 20, 2011
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventor: Katsutoshi Yamanaka
  • Patent number: 8045354
    Abstract: A method for operating a matrix converter to convert n phases of a generator into alternating voltage with nr (nr<n) phases of a load connected to a network includes the steps of alternatingly connecting the nr phases of the load using a plurality of controllable bi-directional switches disposed in an (n×nr) matrix, wherein nr phases of the generator are always connected with the load and (n?nr) phases of the generator are not connected with the load, and controlling the switching of a phase k of the generator at a time t to a phase c of the grid, using a periodical, continuous, segmented function k(t). The function k(t) defines a broken line having a plurality of segments, wherein each segment i is defined by a starting time ti and a pulsation ?i, and the value of the function k(t) is rounded to the closest integer value.
    Type: Grant
    Filed: March 28, 2008
    Date of Patent: October 25, 2011
    Assignee: Alstom Technology Ltd
    Inventor: Alain Lacaze
  • Publication number: 20110235739
    Abstract: A frequency converter includes a first pair of transistors including first and second transistors, a second pair of transistors including third and fourth transistors, and a variable impedance circuit. The first transistor includes source terminal being connected to positive-phase input terminal, drain terminal being connected to positive-phase output terminal, and gate terminal being supplied with positive-phase local signal. The second transistor includes source terminal being connected to positive-phase input terminal, drain terminal being connected to negative-phase output terminal, and gate terminal being supplied with negative-phase local signal. The third transistor includes source terminal being connected to negative-phase input terminal, drain terminal being connected to positive-phase output terminal, and gate terminal being supplied with negative-phase local signal.
    Type: Application
    Filed: September 13, 2010
    Publication date: September 29, 2011
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Hiroaki Hoshino, Toshiya Mitomo
  • Publication number: 20110228579
    Abstract: An adjustable frequency generator for a power supply is disclosed. The adjustable frequency generator comprises a waveform generator, a voltage generator and a comparator. The waveform generator is used for generating a saw wave. The voltage generator is used for generating a variable upper reference voltage and a variable lower reference voltage according to variation of a load. The comparator is coupled to the waveform generator and the voltage generator and used for comparing the saw wave with the variable upper reference voltage and the variable lower reference voltage and generating an output signal. A frequency of the output signal decreases when the load becomes lighter.
    Type: Application
    Filed: October 14, 2010
    Publication date: September 22, 2011
    Inventors: Chin-Yen Lin, Min-Chu Chien, Fu-Yuan Chen
  • Patent number: 8009452
    Abstract: A power supply includes a power source having at least one power source output, and a plurality of drivers connected to the at least one power source output. At least one of the plurality of drivers includes a bridge network having a first switch, a second switch and a bridge network output. The first switch is connected between the at least one power source output and the bridge network output. The second switch is connected between the bridge network output and a ground. The bridge network further includes at least one control input connected to the second switch. The bridge network is adapted to change a state of the first switch based on a state of the second switch.
    Type: Grant
    Filed: March 4, 2010
    Date of Patent: August 30, 2011
    Inventors: Laurence P. Sadwick, Ruey-Jen Hwu, Mohammad M. Mojarradi
  • Publication number: 20110181128
    Abstract: Circuit topologies and control methods for a power converter and are described.
    Type: Application
    Filed: January 21, 2011
    Publication date: July 28, 2011
    Applicant: MASSACHUSETTS INSTITUTE OF TECHNOLOGY
    Inventors: David J. Perreault, Brandon J. Pierquet
  • Publication number: 20110116295
    Abstract: A control device for a matrix converter includes an input voltage detector, an output current detector, a pulse width modulator, and an input voltage command calculator. The input voltage detector is configured to detect an input voltage of the matrix converter. The output current detector is configured to detect an output current of the matrix converter. The pulse width modulator is configured to generate a PWM pulse command signal by using the input voltage, the output current, and an output line voltage command. The input voltage command calculator is configured to calculate an input voltage command of the matrix converter.
    Type: Application
    Filed: November 30, 2010
    Publication date: May 19, 2011
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Yozo UEDA, Ryuji SUENAGA, Eiji WATANABE
  • Patent number: 7881087
    Abstract: An output voltage command signal for outputting a specified three-phase ac output voltage is generated by a line voltage control command signal generating section, and a signal representing a current flow ratio is generated by a current flow ratio generating section based on a specified input current command signal. The output voltage command signal is corrected by a command signal computing section based on the output voltage command signal generated by the line voltage control command signal generating section and the signal representing the current flow ratio generated by the current flow ratio generating section. A PWM conversion signal is generated by a PWM conversion signal generating section based on the corrected output voltage command signal and a carrier signal. Based on the generated PWM conversion signal, a three-phase ac input voltage is converted into a specified three-phase ac input voltage by a conversion section.
    Type: Grant
    Filed: April 20, 2007
    Date of Patent: February 1, 2011
    Assignee: Daikin Industries, Ltd.
    Inventor: Kenichi Sakakibara
  • Publication number: 20100277961
    Abstract: A method for mitigating aliasing effects in a single phase power converter and mitigating aliasing effects and inhibiting thermal run-away in a multi-phase power converter at varying load transition rates. A single phase or multi-phase power converter having an on-time is provided and the frequency of the power converter is adjusted so that a load step period and the on time of the single phase power converter are in a temporal relationship. Alternatively, a load step rate is inhibited from locking onto a phase current of the single phase power converter by suspending an oscillator signal. In accordance with another alternative, a load step rate is inhibited from locking onto a phase current of the single phase power converter by suspending an oscillator signal and dithering an input signal to the oscillator.
    Type: Application
    Filed: July 15, 2010
    Publication date: November 4, 2010
    Inventors: OLE P. MOYER, Paul Jay Harriman, Benjamin M. Rice, Christopher J. Gass, Michael A. Stapleton
  • Patent number: 7800929
    Abstract: A control method for a PWM cyclo-converter is provided in which a voltage can be accurately generated even when a voltage command is small. In the PWM cyclo-converter, the turning on and off operations of two-way semiconductor switch are repeated at intervals of short time. As switching patterns, within the intervals of short time, a first terminal of output side terminals outputs in order a maximum potential phase P, an intermediate potential phase M and the maximum potential phase N, a second terminal of the output side terminals outputs in order the maximum potential phase P, the intermediate potential phase M, a minimum potential phase N, the intermediate potential phase M and the maximum potential phase P, and a third terminal of the output side terminals outputs in order the intermediate potential phase M, the minimum potential phase N and the intermediate potential phase M.
    Type: Grant
    Filed: March 25, 2005
    Date of Patent: September 21, 2010
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Eiji Yamamoto, Hidenori Hara, Jun-Koo Kang
  • Patent number: 7782644
    Abstract: A power supply includes a power source having at least one power source output, and a plurality of drivers connected to the at least one power source output. At least one of the plurality of drivers includes a bridge network having a first switch, a second switch and a bridge network output. The first switch is connected between the at least one power source output and the bridge network output. The second switch is connected between the bridge network output and a ground. The bridge network further includes at least one control input connected to the second switch to direct electrical current from the at least one power source output either substantially through the bridge network output or through the second switch to ground.
    Type: Grant
    Filed: March 3, 2007
    Date of Patent: August 24, 2010
    Inventors: Laurence P. Sadwick, Mohammad M. Mojarradi, Ruey-Jen Hwu
  • Patent number: 7729148
    Abstract: A method for thermal protection of a frequency converter and a frequency converter includes means for controlling the output current of the frequency converter. The method includes the steps of determining predetermined data points which define a thermal current limit for a semiconductor component of the frequency converter at specific temperatures at plural switching frequencies, and determining predetermined data points which define a thermal current limit for the semiconductor component at specific temperatures at a zero converter output frequency. The method also includes determining the highest allowable thermal current as a function of a measured temperature, a determined switching frequency, and a determined output frequency based on the defined data points, and limiting the output current of the frequency converter to the determined highest allowable thermal current.
    Type: Grant
    Filed: November 27, 2007
    Date of Patent: June 1, 2010
    Assignee: ABB Oy
    Inventors: Ari Hyvärinen, Antti Tarkiainen, Johanna Laukkanen
  • Patent number: 7710063
    Abstract: An electric power converter, electric power conversion system and method that, without using a DC-DC converter, uses and allots the electric power of plural power sources while reducing the volume and losses. At least one phase of the motor is connected to plural power sources and generates and synthesizes pulses from output voltages of plural power sources so as to drive the multi-phase AC motor. A different phase of the motor is connected to one DC power source and generates pulses from the output voltage of the power source so as to generate a driving voltage for the multi-phase AC motor. This arrangement allows use/allotment of the power of plural power sources with a reduced number of semiconductor components.
    Type: Grant
    Filed: March 15, 2007
    Date of Patent: May 4, 2010
    Assignee: Nissan Moto Co., Ltd.
    Inventors: Kantaro Yoshimoto, Yasuhiko Kitajima, Kengo Maikawa
  • Patent number: 7626840
    Abstract: The parallel multiplex matrix converter couples in parallel at least two matrix converters, each of which PWM-controls bidirectional switches coupling input phases from an AC power supply to each output phases so as to output an arbitrary AC voltage or DC voltage. The output sides of the matrix converters are directly coupled in parallel to each other without any reactor. The input sides of the matrix converters use reactors inserted between the input phases from the AC power supply and the AC power supply at each of the respective matrix converters coupled in parallel.
    Type: Grant
    Filed: September 27, 2005
    Date of Patent: December 1, 2009
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventor: Yozo Ueda
  • Patent number: 7599204
    Abstract: A method includes controlling the cyclo-converter 7 in coordination with controlling a coupled HF inverter 3. The controlling of the cyclo-converter 7 provides at least a first freewheeling FW period in the cyclo-converter for each cycle of the HF inverter 3. The controlling of the HF inverter provides a freewheeling period in the HF inverter 3 each time the first freewheeling period is provided in the cyclo-converter.
    Type: Grant
    Filed: August 29, 2006
    Date of Patent: October 6, 2009
    Assignee: GM Global Technology Operations, Inc.
    Inventors: Lateef A. Kajouke, Silva Hiti
  • Patent number: 7577009
    Abstract: It is an object of the present invention to provide a PWM cycloconverter that can compensate an error between a voltage command and a real voltage generated by a commuting operation. The PWM cycloconverter for solving the above-described problem includes: an input voltage phase detector (6) for detecting the phase of the voltage of a three-phase ac power source (1); a current direction detector (7) for detecting the direction of a current supplied to a two-way semiconductor switch (3); and a commutation compensator (11) for receiving the outputs of the input voltage phase detector and the current detector as inputs to compensate for a voltage command.
    Type: Grant
    Filed: May 31, 2005
    Date of Patent: August 18, 2009
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Eiji Yamamoto, Hidenori Hara, Kouichi Eguchi
  • Publication number: 20090154210
    Abstract: The present invention provides a bi-directional field effect transistor and a matrix converter using the same, in which a current flowing bi-directionally can be controlled by means of a single device. The bi-directional field effect transistor includes: a semiconductor substrate 1; a gate region which is arranged on the semiconductor substrate 1, with a channel parallel to a principal surface of the substrate 1 and a gate electrode 13a for controlling conductance of the channel; a first region which is arranged on a first side of the channel; and a second region which is arranged on a second side of the channel; wherein a forward current which flows from a first electrode 11a of the first region through the channel to a second electrode 12a of the second region and a backward current which flows from the second electrode 12a through the channel to the first electrode 11a can be controlled by a gate voltage applied to the gate electrode 13a.
    Type: Application
    Filed: September 30, 2005
    Publication date: June 18, 2009
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventor: Kazuhiro Fujikawa
  • Patent number: 7542308
    Abstract: A DC-DC converter is provided with a control circuit 6 which comprises a drive signal generator 11 for producing on-off signals to a control terminal of a MOS-FET 3 in synchronization with pulse signals VOSC from an oscillator 10; an intermittent controller 12 for producing a control signal VC1 to drive signal generator 11 in response to the level of detection signal from an output voltage detector 5 to convert MOS-FET 3 to the intermittent operation during the light load period; and a power control circuit 16 for ceasing power supply VCC to oscillator 10 in response to control signal VC1 from intermittent controller 12 to stop production of pulse signal VOSC from oscillator 10 for the cessation term of MOS-FET 3 during the intermittent operation.
    Type: Grant
    Filed: March 27, 2006
    Date of Patent: June 2, 2009
    Assignee: Sanken Electric Co., Ltd.
    Inventor: Tomoyasu Yamada
  • Patent number: 7518893
    Abstract: A method for operation of a converter circuit is specified, wherein the converter circuit has a converter unit with a multiplicity of drivable power semiconductor switches and an LCL filter which is connected to each phase connection of the converter unit, in which method the drivable power semiconductor switches are driven by means of a drive signal which is formed from reference voltages. The reference voltages are formed by subtraction of damping voltages from reference-phase connection voltages, with the damping voltages being formed from filter capacitance currents, weighted with a variable damping factor of the LCL filter. An apparatus for carrying out the method is also specified.
    Type: Grant
    Filed: July 16, 2007
    Date of Patent: April 14, 2009
    Assignee: ABB Schweiz AG
    Inventors: Srinivas Ponnaluri, Jürgen Steinke
  • Publication number: 20090073735
    Abstract: An analog, duty cycle replicating frequency converter extracts duty cycle information from an input, pulse width modulated signal and generates an output pulse width modulated signal of the same duty cycle at a different frequency without regard to the frequency of the input signal. It uses bipolar transistor based circuitry, adaptable to an application specific integrated circuit, to derive voltages representing the on-time and period durations of the input signal, convert these voltages to currents representing the logarithms thereof, generate a voltage representing the difference between the currents, exponentially convert the voltage to a current representing the duty cycle and control an oscillator to generate an output pulse width modulated signal at a predetermined frequency with the duty cycle of the input signal.
    Type: Application
    Filed: September 13, 2007
    Publication date: March 19, 2009
    Inventor: Scott B. Kesler
  • Patent number: 7457141
    Abstract: It is an object of this invention to provide an AC adaptor capable of achieving downsizing and cost reduction, and having both a constant-voltage/constant-current control function necessary for battery charge, and an optimum current control function for driving of a low-power-consumption electronic apparatus. This AC adaptor includes a first constant-current control device which performs first constant-current control for charging a battery, a second constant-current control device which performs second constant-current control for supplying an electric current necessary to drive an electronic apparatus, and a voltage detecting device which detects the voltage drop of a DC output. If the output voltage becomes lower than a preset value, the second constant-current control for supplying the electric current necessary to drive the electronic apparatus is performed.
    Type: Grant
    Filed: February 24, 2004
    Date of Patent: November 25, 2008
    Assignee: Canon Kabushiki Kaisha
    Inventor: Isao Hayashi
  • Patent number: 7421301
    Abstract: A control system and a method of using the same for an electric machine having a random number generating module generating a random number ranging from a first value to a second value, a multiplying module multiplying the random number and a sample rate to generate an random delay value; and a delay limiter module limiting the random delay value as a function of speed of the electric machine and generating a limited delay value.
    Type: Grant
    Filed: September 3, 2004
    Date of Patent: September 2, 2008
    Assignee: General Motors Corporation
    Inventors: Steven E. Schulz, Daniel L. Kowalewski
  • Patent number: 7362077
    Abstract: A boost control module operates semiconductor switches of a boost converter circuit in an avalanche mode to precharge a boost output capacitor. The boost control module comprises a switching module that complementarily transitions a first semiconductor switch and a second semiconductor switch between ON and OFF states when a current does not exceed a maximum current threshold. The switching module transitions the first semiconductor switch and the second semiconductor switch to the OFF state when the current exceeds the maximum current threshold. The switching module maintains the first semiconductor switch and the second semiconductor switch in the OFF state until at least one of the inductor current is less than or equal to a minimum current threshold.
    Type: Grant
    Filed: August 2, 2005
    Date of Patent: April 22, 2008
    Assignee: GM Global Technology Operations, Inc.
    Inventor: Keming Chen
  • Patent number: 7339809
    Abstract: The present invention comprises systems and methods for electrical power regulation and distribution. In an embodiment, a system includes a modulator coupled to the source that receives an unregulated output waveform and is operable to produce a first composite waveform, and a mixing unit that is operable to generate a second composite waveform by introducing a frequency modulated component into the first composite waveform. A demodulator is coupled to the mixing unit that demodulates the second composite waveform to generate a third composite waveform. A filter network is coupled to the demodulator that is configured to select a desired spectral portion of the third composite waveform.
    Type: Grant
    Filed: November 30, 2004
    Date of Patent: March 4, 2008
    Assignee: The Boeing Company
    Inventors: David D. Bennett, Douglas S. York