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Single wire digital width modulation for fan control with tachometer feedback

  • US 6,563,284 B2
  • Filed: 11/21/2001
  • Issued: 05/13/2003
  • Est. Priority Date: 11/21/2000
  • Status: Active Grant
First Claim
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1. A motor driver system having tachometer feedback, the system having a motor controller circuit operable to generate a pulse width modulation (PWM) control signal, and a motor driver circuit operable to driver a motor at a duty cycle associated with the PWM control signal, comprising:

  • a motor position detection circuit operable to generate a signal associated with a predetermined position of a rotor of the motor;

    a current pulse generation circuit operable to generate a current pulse associated with the PWM control signal in response to the signal from the motor position detection circuit; and

    a motor speed determination circuit operable to determine a speed of the motor using the current pulse.

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