Motor control circuit

Details Motor control circuit Motor control circuit

2007-07-10

2007-07-10

Ip, Paul (Department: 2837)

Electricity: motor control systems

Open loop speed control system for dc motor with commutator

Analog armature control

C388S809000, C318S132000, C318S254100, C318S599000, C331S016000

Reexamination Certificate

active

10895902

ABSTRACT:
A motor control circuit includes a pulse width modulation (PWM) signal generating circuit, a driving circuit and a waveform-shaping circuit connected between the PWM signal generating circuit and the driving circuit. The PWM signal generating circuit generates a square wave with a sequence of alternating on-time and off-time. The waveform-shaping circuit adjusts the rise-time and the fall-time of the square wave to be both within a range of 5% to 15% of the square wave period, and the driving circuit outputs a driving signal to a fan motor according to the adjusted square wave.

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