Self-startup circuit for DC fan

Details Self-startup circuit for DC fan Self-startup circuit for DC fan

2007-04-17

2007-04-17

Donovan, Lincoln (Department: 2837)

Electricity: motive power systems

Switched reluctance motor commutation control

C318S471000, C318S473000, C388S800000, C388S804000, C388S811000

Reexamination Certificate

active

11263614

ABSTRACT:
A self-startup circuit for a DC fan includes a voltage sampling device receiving a first control signal, a comparator, and a self-startup device. The comparator includes two input terminals and an output terminal. One input terminal is connected to an output terminal of the voltage sampling device. The self-startup device has a switching device and a diode connected in parallel. The self-startup device has an input terminal connected to the output terminal of the comparator, and outputs a second control signal for keeping the DC fan rotating even when the first control signal has a very low duty cycle.

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