Patents by Inventor Shigehiro Masamoto

Shigehiro Masamoto 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).

  • Semiconductor device, motor drive device and air conditioning machine
    Patent number: 7750596
    Abstract: The semiconductor device according to the present invention generates pulse width modulation signals for controlling inverter circuits that drive a motor. The semiconductor device includes: a first register which holds values for determining a period in which each pulse width modulation signal becomes active; a correction buffer which holds a correction value; a first counter; a second counter which counts a value obtained by temporally advancing or delaying a count value of the first counter; a selector which selects the count value of the first counter or the count value of the second counter; and a pulse width modulation control unit which generates each pulse width modulation signal, logical values of which are switched in a timing when the selected count value matches the value held by the first register.
    Type: Grant
    Filed: September 26, 2007
    Date of Patent: July 6, 2010
    Assignee: Panasonic Corporation
    Inventors: Shigehiro Masamoto, Masaru Kohara
  • SEMICONDUCTOR DEVICE, MOTOR DRIVE DEVICE AND AIR CONDITIONING MACHINE
    Publication number: 20080116841
    Abstract: The semiconductor device according to the present invention generates pulse width modulation signals for controlling inverter circuits that drive a motor. The semiconductor device includes: a first register which holds values for determining a period in which each pulse width modulation signal becomes active; a correction buffer which holds a correction value; a first counter; a second counter which counts a value obtained by temporally advancing or delaying a count value of the first counter; a selector which selects the count value of the first counter or the count value of the second counter; and a pulse width modulation control unit which generates each pulse width modulation signal, logical values of which are switched in a timing when the selected count value matches the value held by the first register.
    Type: Application
    Filed: September 26, 2007
    Publication date: May 22, 2008
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Shigehiro MASAMOTO, Masaru KOHARA