Rotation detection circuit of a dc brushless motor using a fixed bias voltage

摘要

A rotation detection circuit of a dc brushless motor using a fixed bias voltage includes a transistor, and a signal adjuster. The signal adjuster is connected in series between the transistor and driver circuit of the dc brushless motor, for adjusting a signal output by the driver circuit to the according to a fixed bias voltage. The signal adjuster can be selectively supplied with a fixed bias voltage or connected in series with a zener diode. The signal adjuster can be adjusted according to the characteristics of the motor driver circuit, thereby enhancing the design of the rotation detection circuit.