| 摘要 |
<p>A protection circuit of a DC brush motor is connected between an AC power supply and a rectification circuit. The protection circuit includes a power circuit, an AC current detecting circuit, a rectifying filtering and regulating circuit, a microprocessor, a driving circuit and a switching unit. The switching unit is connected in series with the power supply line of the motor. An input terminal of the power circuit is connected to the AC power supply, and an output terminal of the power circuit supplies power to each circuit. The AC current detecting circuit obtains a current signal from the power supply line, and sends the current signal processed by the rectifying filtering and regulating circuit to the microprocessor. An output terminal of the microprocessor is connected to an input terminal of the driving circuit. The driving circuit controls the switching unit to turn on or cut off the power supply line. The protection circuit has high reliability, can rapidly and effectively protect the motor, and can prolong the working life of the motor.</p> |
