Patents by Inventor Ryutarou Arakawa

Ryutarou Arakawa 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).

  • Switching control circuit with off period adjustment
    Patent number: 7439719
    Abstract: A switching control circuit is provided which can increase the off period of a switching element when the on period of the switching element is equal to the sum of the minimum pulse period (blanking period (a fixed period during which drain current is not detected after the switching element is turned on)) and a detection delay period (a period from when the drain current is equal to or higher than a detection criterion to when the switching element is actually turned off) and PWM control is disabled. An off period adjusting circuit generates, when the on period of the switching element is equal to the minimum pulse period, an adjusting signal OFF_C for increasing the off period of the switching element and supplies the signal to an on/off circuit for controlling the periodic on/off operation of the switching element.
    Type: Grant
    Filed: September 22, 2006
    Date of Patent: October 21, 2008
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yoshiaki Hachiya, Ryutarou Arakawa, Takashi Kunimatsu, Minoru Fukui
  • Switching control circuit
    Publication number: 20070176583
    Abstract: A switching control circuit is provided which can increase the off period of a switching element when the on period of the switching element is equal to the sum of the minimum pulse period (blanking period (a fixed period during which drain current is not detected after the switching element is turned on)) and a detection delay period (a period from when the drain current is equal to or higher than a detection criterion to when the switching element is actually turned off) and PWM control is disabled. An off period adjusting circuit generates, when the on period of the switching element is equal to the minimum pulse period, an adjusting signal OFF_C for increasing the off period of the switching element and supplies the signal to an on/off circuit for controlling the periodic on/off operation of the switching element.
    Type: Application
    Filed: September 22, 2006
    Publication date: August 2, 2007
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yoshiaki Hachiya, Ryutarou Arakawa, Takashi Kunimatsu, Minoru Fukui