| 摘要 |
PROBLEM TO BE SOLVED: To provide a control circuit for a DC motor which is not damaged by BEMF.SOLUTION: A control circuit for a DC motor has: first and second input ports for connection to a DC source; an H-bridge driving circuit, having first and second switches connected in series between the input ports, third and fourth switches connected in series between the input ports, a first output port between the first and second switches, a second output port between the third and fourth switches; and a shunt circuit and/or a blocking circuit. The motor is connected between the first and second output ports. The shunt circuit is connected between the first and second output ports and has a resistance that will decrease in response to BEMF generated by the motor. The blocking circuit is connected in series with the motor between the output ports and has a resistance that increases in response to BEMF generated by the motor. |
