Invention Grant
US07654756B2 Actuator drive circuit and actuator device 失效
执行器驱动电路和执行器装置

  • Patent Title: Actuator drive circuit and actuator device
  • Patent Title (中): 执行器驱动电路和执行器装置
  • Application No.: US11628786
    Application Date: 2005-06-09
  • Publication No.: US07654756B2
    Publication Date: 2010-02-02
  • Inventor: Yutaka Sasamoto
  • Applicant: Yutaka Sasamoto
  • Applicant Address: JP Kyoto
  • Assignee: Rohm Co., Ltd.
  • Current Assignee: Rohm Co., Ltd.
  • Current Assignee Address: JP Kyoto
  • Agency: Fish & Richardson P.C.
  • Priority: JP2004-176239 20040614
  • International Application: PCT/JP2005/010562 WO 20050609
  • International Announcement: WO2005/121890 WO 20051222
  • Main IPC: G03B9/08
  • IPC: G03B9/08
Actuator drive circuit and actuator device
Abstract:
An actuator drive circuit includes a counter starting counting of a frequency-divided clock obtained by dividing a frequency of a reference clock in response to an activation signal, a D/A converter providing a converted voltage increasing gradually and stepwise in response to an output of the counter, a coil current control amplifier comparing a coil current detection voltage corresponding to a value of a coil current of the actuator with the converted voltage immediately after activation, comparing the coil current detection voltage with a coil current limitation reference voltage corresponding to an upper limit value of the coil current after the converted voltage matches the coil current limitation reference voltage, and providing an amplified output voltage prepared by amplifying a difference between the compared voltages, and a drive current output circuit providing a drive current of the actuator according to the amplified output voltage of the coil current control amplifier.
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