Patents by Inventor Hidetaka YAMAURA

Hidetaka YAMAURA 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).

  • Power control circuit performing soft start operation. power supply device, and electronic device
    Patent number: 8922181
    Abstract: A power control circuit includes a control circuit configured to perform a soft start operation before a power supply device performs a normal operation. The power control circuit also includes a counter circuit configured to divide a switching frequency of the power supply device in the normal operation, wherein the counter circuit measures a period of the soft start operation and when the period lasts for a set length, starts to divide the switching frequency, and wherein the power control circuit causes a comparator comprising the counter circuit to compare the frequency obtained by dividing the switching frequency with a reference frequency and corrects the switching frequency.
    Type: Grant
    Filed: June 21, 2010
    Date of Patent: December 30, 2014
    Assignee: Spansion LLC
    Inventors: Hidetaka Yamaura, Takehito Doi
  • POWER CONTROL CIRCUIT, POWER SUPPLY DEVICE, AND ELECTRONIC DEVICE
    Publication number: 20100320981
    Abstract: A power control circuit includes a control circuit configured to perform a soft start operation before a power supply device performs a normal operation. The power control circuit also includes a counter circuit configured to divide a switching frequency of the power supply device in the normal operation, wherein the counter circuit measures a period of the soft start operation and when the period lasts for a set length, starts to divide the switching frequency, and wherein the power control circuit causes a comparator comprising the counter circuit to compare the frequency obtained by dividing the switching frequency with a reference frequency and corrects the switching frequency.
    Type: Application
    Filed: June 21, 2010
    Publication date: December 23, 2010
    Applicant: FUJITSU SEMICONDUCTOR LIMITED
    Inventors: Hidetaka YAMAURA, Takehito Doi