发明授权
US08134253B2 Load driving circuit, integrated circuit, DC-DC converter, and load driving method 失效
负载驱动电路,集成电路,DC-DC转换器和负载驱动方式

  • 专利标题: Load driving circuit, integrated circuit, DC-DC converter, and load driving method
  • 专利标题(中): 负载驱动电路,集成电路,DC-DC转换器和负载驱动方式
  • 申请号: US12448773
    申请日: 2007-10-24
  • 公开(公告)号: US08134253B2
    公开(公告)日: 2012-03-13
  • 发明人: Chihiro Watanabe
  • 申请人: Chihiro Watanabe
  • 申请人地址: JP Osaka
  • 专利权人: Sharp Kabushiki Kaisha
  • 当前专利权人: Sharp Kabushiki Kaisha
  • 当前专利权人地址: JP Osaka
  • 代理机构: Harness, Dickey & Pierce, PLC
  • 优先权: JP2007-041319 20070221
  • 国际申请: PCT/JP2007/070733 WO 20071024
  • 国际公布: WO2008/102479 WO 20080828
  • 主分类号: H02J3/14
  • IPC分类号: H02J3/14
Load driving circuit, integrated circuit, DC-DC converter, and load driving method
摘要:
A load driving circuit (20) according to the present invention, for carrying out PWM control to cause currents of respective light emitting diode lines (3-1 . . . 3-N) connected in parallel, each of the light emitting diode lines (3-1 . . . 3-N) including a plurality of light emitting diodes (4) connected in series, causes timing at which a current of any one of the light emitting diode lines (3-1 . . . 3-N) is turned on or off to be different from timing at which current(s) of at least another one of the light emitting diode lines (3-1 . . . 3-N) is(are) turned on or off. This makes it possible to provide a load driving circuit which (i) does not have a reduction in a degree of freedom in selecting a frequency of a PWM control signal that is used to control loads, (ii) does not prevent a peripheral circuit from following the PWM control circuit, and (iii) prevents generation of sounds.
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