Patents by Inventor Taku Takaku

Taku Takaku has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 9979277
    Abstract: A pulse width modulation (PWM) control device for converting a first PWM signal for a two-level power conversion device to a second PWM signal for a three-level power conversion device, the three-level power conversion device including a switch, the second PWM signal driving the switch through a drive unit. The PWM control device includes an input terminal for receiving the first PWM signal for the two-level power conversion device, a conversion unit configured to convert the first PWM signal into the second PWM signal for the three-level power conversion device, and an output unit that outputs the second PWM signal to the drive unit.
    Type: Grant
    Filed: March 6, 2017
    Date of Patent: May 22, 2018
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventor: Taku Takaku
  • Publication number: 20170271995
    Abstract: A pulse width modulation (PWM) control device for converting a first PWM signal for a two-level power conversion device to a second PWM signal for a three-level power conversion device, the three-level power conversion device including a switch, the second PWM signal driving the switch through a drive unit. The PWM control device includes an input terminal for receiving the first PWM signal for the two-level power conversion device, a conversion unit configured to convert the first PWM signal into the second PWM signal for the three-level power conversion device, and an output unit that outputs the second PWM signal to the drive unit.
    Type: Application
    Filed: March 6, 2017
    Publication date: September 21, 2017
    Applicant: FUJI ELECTRIC CO., LTD.
    Inventor: Taku TAKAKU
  • Patent number: 7919887
    Abstract: In order to provide a pulse power supply device using regenerating magnetic energy stored in a discharge circuit to a capacitor so as to use it as next discharge energy and supplying a bipolar pulse current with high repetition, a bridge circuit is composed of four inverse-conductive semiconductor switches, a charged energy source capacitor is connected to a DC terminal of the bridge circuit, and an inductive load is connected to its AC terminal. A control signal is supplied to gates of the inverse-conductive semiconductor switches, and a control is made so that when a discharge current rises, is maintained, or is reduced, all the gates are turned off, and the magnetic energy of the electric current can be automatically regenerated to the energy source capacitor by a diode function of the switches. Further, a large current power supply is inserted into a discharge circuit so as to replenish energy loss due to discharge, thereby enabling high-repetition discharge.
    Type: Grant
    Filed: February 18, 2009
    Date of Patent: April 5, 2011
    Assignee: MERSTech, Inc.
    Inventors: Ryuichi Shimada, Taku Takaku
  • Patent number: 7898113
    Abstract: In order to provide a pulse power supply device using regenerating magnetic energy stored in a discharge circuit to a capacitor so as to use it as next discharge energy and supplying a bipolar pulse current with high repetition, a bridge circuit is composed of four inverse-conductive semiconductor switches, a charged energy source capacitor is connected to a DC terminal of the bridge circuit, and an inductive load is connected to its AC terminal. A control signal is supplied to gates of the inverse-conductive semiconductor switches, and a control is made so that when a discharge current rises, is maintained or is reduced, all the gates are turned off, and the magnetic energy of the electric current can be automatically regenerated to the energy source capacitor by a diode function of the switches. Further, a large-current power supply is inserted into a discharge circuit so as to replenish energy loss due to discharge, thereby enabling high-repetition discharge.
    Type: Grant
    Filed: July 19, 2010
    Date of Patent: March 1, 2011
    Assignee: MERTHTech, Inc.
    Inventors: Ryuichi Shimada, Taku Takaku
  • Patent number: 7843166
    Abstract: The present invention relates to an alternating-current power supply device which can improve a power factor of an alternating-current load, realizes low cost and miniaturization, and recovers magnetic energy. The alternating-current power supply device includes a bridge circuit composed of four reverse conducting semiconductor switches, a capacitor that is connected between direct-current terminals of the bridge circuit and absorbs the magnetic energy at the time of cutting off the current, an alternating-current voltage source that is connected to the induction load in series and is inserted between alternating-current terminals of the bridge circuit, and a control circuit that gives a control signal to gates of the respective reverse conducting semiconductor switches and controls on/off states of the respective reverse conducting semiconductor switches.
    Type: Grant
    Filed: June 23, 2009
    Date of Patent: November 30, 2010
    Assignee: MERSTech, Inc.
    Inventors: Ryuichi Shimada, Hideo Sumitani, Taku Takaku, Takanori Isobe
  • Publication number: 20100277138
    Abstract: In order to provide a pulse power supply device using regenerating magnetic energy stored in a discharge circuit to a capacitor so as to use it as next discharge energy and supplying a bipolar pulse current with high repetition, a bridge circuit is composed of four inverse-conductive semiconductor switches, a charged energy source capacitor is connected to a DC terminal of the bridge circuit, and an inductive load is connected to its AC terminal. A control signal is supplied to gates of the inverse-conductive semiconductor switches, and a control is made so that when a discharge current rises, is maintained or is reduced, all the gates are turned off, and the magnetic energy of the electric current can be automatically regenerated to the energy source capacitor by a diode function of the switches. Further, a large-current power supply is inserted into a discharge circuit so as to replenish energy loss due to discharge, thereby enabling high-repetition discharge.
    Type: Application
    Filed: July 19, 2010
    Publication date: November 4, 2010
    Applicant: MERSTech Inc.
    Inventors: Ryuichi Shimada, Taku Takaku
  • Publication number: 20090251114
    Abstract: The present invention relates to an alternating-current power supply device which can improve a power factor of an alternating-current load, realizes low cost and miniaturization, and recovers magnetic energy. The alternating-current power supply device includes a bridge circuit composed of four reverse conducting semiconductor switches, a capacitor that is connected between direct-current terminals of the bridge circuit and absorbs the magnetic energy at the time of cutting off the current, an alternating-current voltage source that is connected to the induction load in series and is inserted between alternating-current terminals of the bridge circuit, and a control circuit that gives a control signal to gates of the respective reverse conducting semiconductor switches and controls on/off states of the respective reverse conducting semiconductor switches.
    Type: Application
    Filed: June 23, 2009
    Publication date: October 8, 2009
    Applicant: MERSTech, Inc.
    Inventors: Ryuichi Shimada, Hideo Sumitani, Taku Takaku, Takanori Isobe
  • Publication number: 20090146504
    Abstract: In order to provide a pulse power supply device using regenerating magnetic energy stored in a discharge circuit to a capacitor so as to use it as next discharge energy and supplying a bipolar pulse current with high repetition, a bridge circuit is composed of four inverse-conductive semiconductor switches, a charged energy source capacitor is connected to a DC terminal of the bridge circuit, and an inductive load is connected to its AC terminal. A control signal is supplied to gates of the inverse-conductive semiconductor switches, and a control is made so that when a discharge current rises, is maintained, or is reduced, all the gates are turned off, and the magnetic energy of the electric current can be automatically regenerated to the energy source capacitor by a diode function of the switches. Further, a large current power supply is inserted into a discharge circuit so as to replenish energy loss due to discharge, thereby enabling high-repetition discharge.
    Type: Application
    Filed: February 18, 2009
    Publication date: June 11, 2009
    Applicant: MERSTech Inc.
    Inventors: Ryuichi Shimada, Taku Takaku
  • Publication number: 20070159279
    Abstract: The present invention relates to an alternating-current power supply device which can improve a power factor of an alternating-current load, realizes low cost and miniaturization, and recovers magnetic energy. The alternating-current power supply device includes a bridge circuit composed of four reverse conducting semiconductor switches, a capacitor that is connected between direct-current terminals of the bridge circuit and absorbs the magnetic energy at the time of cutting off the current, an alternating-current voltage source that is connected to the induction load in series and is inserted between alternating-current terminals of the bridge circuit, and a control circuit that gives a control signal to gates of the respective reverse conducting semiconductor switches and controls on/off states of the respective reverse conducting semiconductor switches.
    Type: Application
    Filed: May 12, 2004
    Publication date: July 12, 2007
    Inventors: Ryuichi Shimada, Hideo Sumitani, Taku Takaku, Takanori Isobe
  • Publication number: 20060152955
    Abstract: In order to provide a pulse power supply device using regenerating magnetic energy stored in a discharge circuit to a capacitor so as to use it as next discharge energy and supplying a bipolar pulse current with high repetition, a bridge circuit is composed of four inverse-conductive semiconductor switches, a charged energy source capacitor is connected to a DC terminal of the bridge circuit, and an inductive load is connected to its AC terminal. A control signal is supplied to gates of the inverse-conductive semiconductor switches, and a control is made so that when a discharge current rises, is maintained or is reduced, all the gates are turned off, and the magnetic energy of the electric current can be automatically regenerated to the energy source capacitor by a diode function of the switches. Further, a large-current power supply is inserted into a discharge circuit so as to replenish energy loss due to discharge, thereby enabling high-repetition discharge.
    Type: Application
    Filed: August 18, 2003
    Publication date: July 13, 2006
    Inventors: Ryuichi Shimada, Taku Takaku