PWM control circuit for a DC brushless fan

Details PWM control circuit for a DC brushless fan PWM control circuit for a DC brushless fan

1998-01-20

1999-08-24

Ro, Bentsu

Electricity: motive power systems

Plural diverse motor controls

Running-speed control

318254, H02P 608

Patent

active

059428660

ABSTRACT:
PWM control circuit for a DC brushless fan, including a rectifying circuit which rectifies a voltage signal representative of the rotating speed of the fan, a comparator which compares the rectified voltage signal with a reference voltage signal, and a switching device which is repeatedly closed and opened in accordance with the compared result, is provided, whereby the rotating speed of the fan can be controlled and kept at a constant value.
The reference voltage signal can be generated by a voltage divider formed by a thermistor and a resistor, whereby the rotating speed of the fan can be adjusted as the temperature of the working environment varies.

REFERENCES:
patent: 4849677 (1989-07-01), Kruger
patent: 4893067 (1990-01-01), Bhagwat et al.
patent: 5364026 (1994-11-01), Kundert
patent: 5577152 (1996-11-01), Chen
patent: 5594312 (1997-01-01), Schwendemann et al.

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