Patents by Inventor Yasuaki Furusho

Yasuaki Furusho 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: 11996769
    Abstract: A noise filter includes: a voltage detector which detects a common mode voltage generated by a power converter; a voltage division circuit which outputs a division voltage obtained by dividing the common mode voltage detected by the voltage detector; a plurality of common mode transformers which superimpose injection voltages each having a polarity opposite to a polarity of the common mode voltage onto an output from or an input to the power converter; and an injection waveform generator which generates, on the basis of the division voltage, output voltages to be outputted to primary sides of the plurality of common mode transformers. The injection waveform generator generates the output voltages such that a difference between the common mode voltage and a total injection voltage obtained by summing the injection voltages to be superimposed by the plurality of common mode transformers is equal to or smaller than an allowable value.
    Type: Grant
    Filed: June 4, 2020
    Date of Patent: May 28, 2024
    Assignees: MITSUBISHI ELECTRIC CORPORATION, MITSUBISHI ELECTRIC ENGINEERING COMPANY, LIMITED
    Inventors: Yuki Fujita, Yasuaki Furusho, Hiroyuki Ichinose
  • Patent number: 11990833
    Abstract: Provided is a low-cost noise filter having a noise suppression effect that is not reduced even when a resonance frequency changes according to changes in temperature. A noise filter includes: a noise detection unit which detects a common mode noise; a cancellation signal output unit; an injection unit which injects a cancellation signal; and a grounded capacitor. The cancellation signal output unit includes a filter part which generates the cancellation signal from the common mode noise, and an amplification part which amplifies the cancellation signal. A temperature dependence of a product of an inductance value and a capacitance value of a main circuit portion including the noise detection unit, the injection unit, and the grounded capacitor, and a temperature dependence of a product of an inductance value and a capacitance value of the filter part, are equal to each other.
    Type: Grant
    Filed: July 13, 2020
    Date of Patent: May 21, 2024
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yasuaki Furusho, Ryota Asakura, Ryosuke Kobayashi, Mamoru Kamikura
  • Publication number: 20230378868
    Abstract: A noise filter includes: a voltage detector that detects a common-mode voltage; a voltage divider circuit that outputs a divided voltage divided from the common-mode voltage; multiple common-mode transformers that are connected separately to respective power lines of multiline systems connected in parallel relation to each other to an input or output of the power converter, and that superimpose a superimposing voltage having an opposite polarity to the common-mode voltage on each of the power lines of multiline systems; and an injection waveform generator that generates at least one output voltage to be outputted to primary sides of the multiple common-mode transformers, on the basis of the divided voltage. The injection waveform generator generates as the output voltage, a voltage with which a difference between the superimposing voltage to be super-imposed on each of the power lines and the common-mode voltage is within an allowable value.
    Type: Application
    Filed: November 11, 2020
    Publication date: November 23, 2023
    Applicants: Mitsubishi Electric Corporation, Mitsubishi Electric Engineering Company, Limited
    Inventors: Yuki FUJITA, Yasuaki FURUSHO, Hiroyuki ICHINOSE
  • Publication number: 20230179176
    Abstract: A noise filter includes: a voltage detector which detects a common mode voltage generated by a power converter; a voltage division circuit which outputs a division voltage obtained by dividing the common mode voltage detected by the voltage detector; a plurality of common mode transformers which superimpose injection voltages each having a polarity opposite to a polarity of the common mode voltage onto an output from or an input to the power converter; and an injection waveform generator which generates, on the basis of the division voltage, output voltages to be outputted to primary sides of the plurality of common mode transformers. The injection waveform generator generates the output voltages such that a difference between the common mode voltage and a total injection voltage obtained by summing the injection voltages to be superimposed by the plurality of common mode transformers is equal to or smaller than an allowable value.
    Type: Application
    Filed: June 4, 2020
    Publication date: June 8, 2023
    Applicants: Mitsubishi Electric Corporation, Mitsubishi Electric Engineering Company, Limited
    Inventors: Yuki FUJITA, Yasuaki FURUSHO, Hiroyuki ICHINOSE
  • Publication number: 20230179085
    Abstract: Provided is a low-cost noise filter having a noise suppression effect that is not reduced even when a resonance frequency changes according to changes in temperature. A noise filter includes: a noise detection unit which detects a common mode noise; a cancellation signal output unit; an injection unit which injects a cancellation signal; and a grounded capacitor. The cancellation signal output unit includes a filter part which generates the cancellation signal from the common mode noise, and an amplification part which amplifies the cancellation signal. A temperature dependence of a product of an inductance value and a capacitance value of a main circuit portion including the noise detection unit, the injection unit, and the grounded capacitor, and a temperature dependence of a product of an inductance value and a capacitance value of the filter part, are equal to each other.
    Type: Application
    Filed: July 13, 2020
    Publication date: June 8, 2023
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yasuaki FURUSHO, Ryota ASAKURA, Ryosuke KOBAYASHI, Mamoru KAMIKURA
  • Patent number: 10186980
    Abstract: A power conversion device includes: a plurality of first power semiconductor modules in each of which a series circuit of a first semiconductor device and a second semiconductor device is built in, each of the plurality of first power semiconductor modules being connected in parallel with a series circuit of a first capacitor and a second capacitor connected in series with a DC power source; and a plurality of second power semiconductor module in each of which a bidirectional semiconductor device is built in, the bidirectional semiconductor device being connected between a connection point between the first capacitor and the second capacitor and one of connection points between the first semiconductor devices and the second semiconductor devices. Each of the first power semiconductor modules and the second power semiconductor modules are arranged on a mounting surface of a cooling body in a staggered arrangement.
    Type: Grant
    Filed: September 22, 2017
    Date of Patent: January 22, 2019
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventors: Yasunobu Kadota, Yasuaki Furusho
  • Publication number: 20180145604
    Abstract: A power conversion device includes: a plurality of first power semiconductor modules in each of which a series circuit of a first semiconductor device and a second semiconductor device is built in, each of the plurality of first power semiconductor modules being connected in parallel with a series circuit of a first capacitor and a second capacitor connected in series with a DC power source; and a plurality of second power semiconductor module in each of which a bidirectional semiconductor device is built in, the bidirectional semiconductor device being connected between a connection point between the first capacitor and the second capacitor and one of connection points between the first semiconductor devices and the second semiconductor devices. Each of the first power semiconductor modules and the second power semiconductor modules are arranged on a mounting surface of a cooling body in a staggered arrangement.
    Type: Application
    Filed: September 22, 2017
    Publication date: May 24, 2018
    Applicant: FUJI ELECTRIC CO., LTD.
    Inventors: Yasunobu Kadota, Yasuaki Furusho