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
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申请号: US12448773申请日: 2007-10-24
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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
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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