| 摘要 |
A brushless DC motor control circuit previously detects that two pulse signals generated from a microcomputer of controlling a switching part of driving a brushless DC motor, turns off an input power-supply if the two pulse signal are simultaneously turned on, thereby preventing a breakdown of the switching part. The brushless DC motor control circuit includes: a switching short state detector(4) having AND gates(4A,4B,4C) and diodes(D1-D3); a transistor(Q1) for performing an on/off switching driving according to the output signal of the detector(4); a photo-triac(T1) and a triac(T2) which are turned on and off according to the output signal of the transistor(Q1), and automatically turn off an input power-supply; a power-supply automatic off part(5) which is turned on and off by the triacs(T1,T2), and a rest part(6) for inputting a reset signal to the microcomputer(2) by the output signal of the transistor(Q1).
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