Patents by Inventor Michiho Yoshida

Michiho Yoshida 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: 8743569
    Abstract: The present power supply device includes a microcomputer that detects a current input to an active filter, a voltage input to the active filter, and a voltage output from the active filter, decreases a target voltage as the input current increases, and controls an IGBT to turn on/off the IGBT to match the input current and the input voltage in phase with each other and also match the output voltage to the target voltage. Thus, as the input current increases, the target voltage is decreased. A loss caused at the IGBT can be reduced to be small.
    Type: Grant
    Filed: October 13, 2009
    Date of Patent: June 3, 2014
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Michiho Yoshida
  • Patent number: 8416590
    Abstract: The present power supply device includes a microcomputer that detects a current input to an active filter, a voltage input to the active filter, and a voltage output from the active filter, decreases a target voltage as the input current increases, and controls an IGBT to turn on/off the IGBT to match the input current and the input voltage in phase with each other and also match the output voltage to the target voltage. Thus, as the input current increases, the target voltage is decreased. A power supply terminal can have a voltage with a low noise level.
    Type: Grant
    Filed: October 13, 2009
    Date of Patent: April 9, 2013
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Michiho Yoshida, Masataka Onishi
  • Publication number: 20120260678
    Abstract: An air conditioner includes: a compressor for compressing a refrigerant; an expansion valve for adjusting the flow of the refrigerant; a first temperature sensor for detecting a discharge temperature of the compressor; and a second temperature sensor for detecting a temperature of a condenser. A discharge temperature difference is calculated that is a difference between the discharge temperature detected by the first temperature sensor and the temperature of an outdoor heat exchanger or an indoor heat exchanger functioning as the condenser that is detected by the second temperature sensor. The opening of the expansion valve is set based on the calculated discharge temperature difference and a target discharge temperature difference that is set so that a target degree of superheat is obtained.
    Type: Application
    Filed: December 2, 2010
    Publication date: October 18, 2012
    Inventor: Michiho Yoshida
  • Publication number: 20110228573
    Abstract: The present power supply device includes a microcomputer that detects a current input to an active filter, a voltage input to the active filter, and a voltage output from the active filter, decreases a target voltage as the input current increases, and controls an IGBT to turn on/off the IGBT to match the input current and the input voltage (Vin) in phase with each other and also match the output voltage to the target voltage. Thus, as the input current increases, the target voltage is decreased. A power supply terminal can have a voltage with a low noise level.
    Type: Application
    Filed: October 13, 2009
    Publication date: September 22, 2011
    Inventors: Michiho Yoshida, Masataka Onishi
  • Publication number: 20110211374
    Abstract: The present power supply device includes a microcomputer that detects a current input to an active filter, a voltage input to the active filter, and a voltage output from the active filter, decreases a target voltage as the input current increases, and controls an IGBT to turn on/off the IGBT to match the input current and the input voltage in phase with each other and also match the output voltage to the target voltage. Thus, as the input current increases, the target voltage is decreased.
    Type: Application
    Filed: October 13, 2009
    Publication date: September 1, 2011
    Inventor: Michiho Yoshida