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Motor Speed Control Circuit

  • US 20070046228A1
  • Filed: 08/29/2006
  • Published: 03/01/2007
  • Est. Priority Date: 08/31/2005
  • Status: Active Grant
First Claim
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1. A motor speed control circuit which controls a rotational speed of a motor by controlling an amount of current flowing through a drive coil of the motor, comprising:

  • a reference voltage circuit that generates a reference voltage corresponding to a speed-specifying signal inputted to specify the rotational speed of the motor;

    a speed voltage circuit that generates a speed voltage corresponding to an actual rotational speed of the motor;

    a clamp circuit that limits a level of the speed voltage generated by the speed voltage circuit;

    a comparator that has the reference voltage generated by the reference voltage circuit and the speed voltage limited in level by the clamp circuit applied thereto and compares the two; and

    a control signal generator that generates and outputs a control signal for controlling the amount of current flowing through the drive coil based on a comparing result of the comparator.

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