Fan speed control circuit

Details Fan speed control circuit Fan speed control circuit

2007-05-15

2007-05-15

Ip, Paul (Department: 2837)

Electricity: motor control systems

Open loop speed control system for dc motor with commutator

Analog armature control

C388S805000, C318S599000, C318S434000, C318S254100

Reexamination Certificate

active

10839818

ABSTRACT:
A fan speed control circuit includes a pulse width modulation (PWM) signal generating circuit, a driving circuit and a phase compensation unit. The PWM signal generating circuit generates a PWM control signal with a sequence of alternating on-time and off-time, and the driving circuit outputs a driving signal according to the PWM control signal to a fan motor. The phase compensation unit is connected to the fan motor for delaying or advancing the PWM control signal by a phase angle to synchronize the acting period of the back electromotive force formed by the magnetic flux variation with the off-time of the PWM control signal.

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