Patents by Inventor Takeshi AMIMOTO

Takeshi AMIMOTO 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).

  • Publication number: 20220181990
    Abstract: A first leg includes a first switch circuit disposed between a first node to which a positive electrode of a DC power supply is connected and a second node and a second switch circuit disposed between the second node and a third node. A first filter circuit includes a first capacitor. A bridge circuit includes a second leg and a third leg that are disposed in parallel between the first node and the third node. A clamp circuit includes a bidirectional switch disposed between a fourth node that is a midpoint of the second leg and a fifth node that is a midpoint of the third leg. A second filter circuit includes a first reactor and a second reactor.
    Type: Application
    Filed: July 4, 2019
    Publication date: June 9, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takeshi AMIMOTO, Yu KAWAI
  • Publication number: 20220181991
    Abstract: A bridge circuit includes a first leg and a second leg arranged in parallel between the first node and the third node. A clamp circuit includes a third leg including a first bidirectional switch disposed between a fourth node that is a midpoint of the first leg and a fifth node that is a midpoint of the second leg. A first reactor is connected with the fourth node and a sixth node, and a second reactor is connected with a fifth node and a seventh node. A fourth leg includes a second bidirectional switch disposed between the second node and the fourth node or the fifth node.
    Type: Application
    Filed: July 4, 2019
    Publication date: June 9, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takeshi AMIMOTO, Naoki NISHIO
  • Patent number: 11356038
    Abstract: When an inverter and a converter are merely operated with their carrier waves synchronized with each other, current ripple of a smoothing capacitor connected therebetween might be increased. Accordingly, bipolar modulation PWM control is performed on the inverter, PWM control is performed on the converter, and the phase of the carrier wave for the inverter or the converter is shifted on the basis of AC output, whereby timings of currents flowing into the smoothing capacitor are made different from each other.
    Type: Grant
    Filed: January 28, 2019
    Date of Patent: June 7, 2022
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Takeshi Amimoto, Yu Kawai
  • Publication number: 20220014115
    Abstract: When an inverter and a converter are merely operated with their carrier waves synchronized with each other, current ripple of a smoothing capacitor connected therebetween might be increased. Accordingly, bipolar modulation PWM control is performed on the inverter, PWM control is performed on the converter, and the phase of the carrier wave for the inverter or the converter is shifted on the basis of AC output, whereby timings of currents flowing into the smoothing capacitor are made different from each other.
    Type: Application
    Filed: January 28, 2019
    Publication date: January 13, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takeshi AMIMOTO, Yu KAWAI
  • Patent number: 11128222
    Abstract: A reactor has one end connected to a neutral point of a transformer and the other end connected to a primary-side power supply. The transformer has almost no effective flux linkage for zero-phase current and has a phase difference between the primary side and the secondary side. A first bridge circuit and a second bridge circuit are connected to both ends of the transformer, and electric power of the primary-side power supply is controlled by the duty ratio of the first bridge circuit. The switching pattern of the second bridge circuit is phase-shifted in the leading direction and the lagging direction with reference to the switching pattern of the first bridge circuit, thereby achieving control such that soft switching operation can be performed even when the voltage ratio between the primary-side power supply and the secondary-side power supply fluctuates and the amount of transmission power is reduced.
    Type: Grant
    Filed: March 29, 2018
    Date of Patent: September 21, 2021
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yuki Itogawa, Takeshi Amimoto
  • Publication number: 20210013796
    Abstract: A power conversion device converts a direct-current power on the DC side of the power conversion device to an alternating-current power by an inverter circuit having a plurality of semiconductor switching elements, and outputs the AC power from the AC side of the power conversion device. A current detector detects a reactor current output from the inverter circuit. As overcurrent detector detects overcurrent in a control mode in which the reactor current is caused to follow a reactor current command value, control circuit starts an overcurrent mode in which a time period where the reactor current monotonically decreases is provided. In the overcurrent mode, whether to switch the overcurrent mode to the normal control mode is determined based on the reactor current or in accordance with a timing corresponding to a zero-cross point of a voltage or current on the AC side.
    Type: Application
    Filed: January 9, 2019
    Publication date: January 14, 2021
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takeshi AMIMOTO, Kikuo IZUMI, Tatsuya OKUDA, Tomoaki KIMURA
  • Publication number: 20200274443
    Abstract: A reactor has one end connected to a neutral point of a transformer and the other end connected to a primary-side power supply. The transformer has almost no effective flux linkage for zero-phase current and has a phase difference between the primary side and the secondary side. A first bridge circuit and a second bridge circuit are connected to both ends of the transformer, and electric power of the primary-side power supply is controlled by the duty ratio of the first bridge circuit. The switching pattern of the second bridge circuit is phase-shifted in the leading direction and the lagging direction with reference to the switching pattern of the first bridge circuit, thereby achieving control such that soft switching operation can be performed even when the voltage ratio between the primary-side power supply and the secondary-side power supply fluctuates and the amount of transmission power is reduced.
    Type: Application
    Filed: March 29, 2018
    Publication date: August 27, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yuki ITOGAWA, Takeshi AMIMOTO