| 摘要 |
A PWM motor speed control circuit ( 10 ) includes a PWM signal generator ( 20 ), a driver integrated circuit (IC) ( 101 ) and a photocoupler ( 30 ) coupled between the PWM signal generator and the driver IC. The photocoupler receives an original PWM signal generated by the PWM signal generator and outputs a new PWM signal in response to the original PWM signal, wherein a voltage parameter of the original PWM signal is isolated by the photocoupler from a voltage parameter of the new PWM signal. The new PWM signal is fed to the driver IC and used for controlling speed of a motor ( 100 ).
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