Fan speed control circuit

Details Fan speed control circuit Fan speed control circuit

1993-05-24

1995-10-10

Ro, Bentsu

Electricity: motor control systems

Open loop speed control system for dc motor with commutator

Analog armature control

388934, 318471, H02P 729

Patent

active

054577667

ABSTRACT:
A speed control circuit for a ventilation fan of an electronic device, such as a laser printer, adaptively varies a speed of the ventilation fan depending upon an internal temperature of the device. The speed control circuit has a temperature sensing circuit for generating a voltage depending upon the temperature, a triangular wave generator for generating a triangular wave signal having fixed period, a pulse width modulator for comparing the triangular wave signal with the voltage generated by the temperature sensing circuit and generating pulse-width modulated pulses, and a driving circuit for controlling the speed of the ventilation fan in response to the pulse-width modulated pulses so that the speed of the ventilation fan will be increased in response to an increasing temperature, for example.

REFERENCES:
patent: 4489680 (1984-12-01), Spokas et al.
patent: 4546742 (1985-10-01), Sturges
patent: 4555910 (1985-12-01), Sturges
patent: 4733541 (1988-03-01), Ismail et al.
patent: 4763347 (1988-08-01), Erdman
patent: 4804892 (1989-02-01), Muller
patent: 5234050 (1993-08-01), Weigert
patent: 5363024 (1994-11-01), Hiratsuka et al.

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