Patents by Inventor Norisato TAKEYA

Norisato TAKEYA 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 power source device, semiconductor device, and AC/DC converter including a switching control
    Patent number: 10199938
    Abstract: A switching power source device for controlling a current flowing through a coil by turning on/off a switching element by a PWM control to obtain a desired DC voltage, includes in a PWM ON period to turn on the switching element by the PWM control, a switching control of the switching element is enabled by a first pulse signal whose cycle is shorter than a PWM cycle based on the PWM control and whose pulse width is gradually increased, in a first period just after the PWM ON period is started, and the switching control of the switching element is enabled by the PWM signal based on the PWM control after the first period has elapsed.
    Type: Grant
    Filed: October 31, 2017
    Date of Patent: February 5, 2019
    Assignee: RENESAS ELECTRONICS CORPORATION
    Inventors: Norisato Takeya, Masashi Oshiba, Satoshi Kumaki, Yasutaka Horikoshi
  • SWITCHING POWER SOURCE DEVICE, SEMICONDUCTOR DEVICE, AND AC/DC CONVERTER
    Publication number: 20180054122
    Abstract: A switching power source device for controlling a current flowing through a coil by turning on/off a switching element by a PWM control to obtain a desired DC voltage, includes in a PWM ON period to turn on the switching element by the PWM control, a switching control of the switching element is enabled by a first pulse signal whose cycle is shorter than a PWM cycle based on the PWM control and whose pulse width is gradually increased, in a first period just after the PWM ON period is started, and the switching control of the switching element is enabled by the PWM signal based on the PWM control after the first period has elapsed.
    Type: Application
    Filed: October 31, 2017
    Publication date: February 22, 2018
    Inventors: Norisato TAKEYA, Masashi OSHIBA, Satoshi KUMAKI, Yasutaka HORIKOSHI
  • Switching power source device, semiconductor device, and AC/DC converter
    Patent number: 9837902
    Abstract: The switching power source device obtains a desired DC voltage by controlling the current flowing through a coil by turning on and off a switching element by a PWM control. In the PWM ON period to turn on the switching element by the PWM control, the switching power source device is enabled to switch the switching element by a first pulse signal whose cycle is shorter than the PWM cycle and whose pulse width is gradually increased, in a first period just after the start of the PWM ON period. Further, the switching power source device is enabled to switch the switching element by a PWM signal based on the PWM control after the first period in the PWM ON period has elapsed. According to this approach, it is possible to reduce the harmonic noise.
    Type: Grant
    Filed: August 1, 2013
    Date of Patent: December 5, 2017
    Assignee: Renesas Electronics Corporation
    Inventors: Norisato Takeya, Masashi Oshiba, Satoshi Kumaki, Yasutaka Horikoshi
  • SWITCHING POWER SOURCE DEVICE, SEMICONDUCTOR DEVICE, AND AC/DC CONVERTER
    Publication number: 20160172975
    Abstract: The switching power source device obtains a desired DC voltage by controlling the current flowing through a coil by turning on and off a switching element by a PWM control. In the PWM ON period to turn on the switching element by the PWM control, the switching power source device is enabled to switch the switching element by a first pulse signal whose cycle is shorter than the PWM cycle and whose pulse width is gradually increased, in a first period just after the start of the PWM ON period. Further, the switching power source device is enabled to switch the switching element by a PWM signal based on the PWM control after the first period in the PWM ON period has elapsed. According to this approach, it is possible to reduce the harmonic noise.
    Type: Application
    Filed: August 1, 2013
    Publication date: June 16, 2016
    Inventors: Norisato TAKEYA, Masashi OSHIBA, Satoshi KUMAKI, Yasutaka HORIKOSHI