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Motor Control Circuit, Fan Motor, Electronic Device, and Notebook Personal Computer

  • US 20090102406A1
  • Filed: 10/20/2008
  • Published: 04/23/2009
  • Est. Priority Date: 04/05/2007
  • Status: Active Grant
First Claim
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1. A motor control circuit comprising:

  • a rotation control circuit configured to control rotation of a motor based on a rotation control signal for controlling rotation of the motor and a rotational position detection signal from a Hall element for detecting a rotational position of the motor;

    a determining circuit configured to determine whether the rotation control signal has been generated for a predetermined time period; and

    a Hall element control circuit configured to apply a Hall element source voltage to the Hall element when the determining circuit determines that the rotation control signal has been generated for the predetermined time period, and to stop applying the Hall element source voltage to the Hall element when the determining circuit determines that the rotation control signal has not necessarily been generated for the predetermined time period.

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