Pulse-width modulation motor speed control circuit

Details Pulse-width modulation motor speed control circuit Pulse-width modulation motor speed control circuit

2007-05-22

2007-05-22

Ip, Paul (Department: 2837)

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Armature control by digital or combined analog and digital...

C318S249000, C318S434000, C318S480000, C363S041000, C363S052000

Reexamination Certificate

active

11308608

ABSTRACT:
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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