Patents by Inventor Syouhei YANAGIZU

Syouhei YANAGIZU 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).

  • Vehicle lamp, driving device thereof, and control method thereof
    Patent number: 9198247
    Abstract: A current controller 42 compares a first coil current IL1 flowing in an output inductor L1 with a first upper threshold value and a first lower threshold value. A current limiter 44 compares a second coil current IL2 flowing in an input inductor L2 with a second upper threshold value and a second lower threshold value. A duty controller 46 (i) switches a switching transistor M1 based on the first coil current in a cycle where the first coil current IL1 exceeds the first upper threshold value before the second coil current IL2, exceeds the second upper threshold value. According to the current controller 42, it is possible to stabilize an output current and to limit a current.
    Type: Grant
    Filed: February 12, 2015
    Date of Patent: November 24, 2015
    Assignee: KOITO MANUFACTURING CO., LTD.
    Inventors: Masayasu Ito, Takao Muramatsu, Syouhei Yanagizu
  • VEHICLE LAMP, DRIVING DEVICE THEREOF, AND CONTROL METHOD THEREOF
    Publication number: 20150230302
    Abstract: A current controller 42 compares a first coil current IL1 flowing in an output inductor L1 with a first upper threshold value and a first lower threshold value. A current limiter 44 compares a second coil current IL2 flowing in an input inductor L2 with a second upper threshold value and a second lower threshold value. A duty controller 46 (i) switches a switching transistor M1 based on the first coil current in a cycle where the first coil current IL1 exceeds the first upper threshold value before the second coil current IL2, exceeds the second upper threshold value. According to the current controller 42, it is possible to stabilize an output current and to limit a current.
    Type: Application
    Filed: February 12, 2015
    Publication date: August 13, 2015
    Applicant: KOITO MANUFACTURING CO., LTD.
    Inventors: Masayasu ITO, Takao MURAMATSU, Syouhei YANAGIZU