Motor driving circuit and motor component

    公开(公告)号:US10205412B2

    公开(公告)日:2019-02-12

    申请号:US15231115

    申请日:2016-08-08

    摘要: A motor driving circuit and a motor component are provided. The motor driving circuit includes a bidirectional alternating current switch connected in series with a motor across two terminals of an external alternating current power supply, where the bidirectional alternating current switch is connected between a first node and a second node; a rectifying circuit; a magnetic sensor, configured to detect a magnetic field of a rotor and output a corresponding magnetic inductive signal; a first voltage drop circuit and a second voltage drop circuit connected in series between the first input terminal of the rectifying circuit and the first node, where there is a third node between the first voltage drop circuit and the second voltage drop circuit, and the first voltage drop circuit is connected between the first node and the third node; a switch circuit connected between the third node and a control terminal of the bidirectional alternating current switch, where the switch circuit includes a first terminal, a second terminal, a control terminal and a switch arranged between the first terminal and the second terminal; and a switch control circuit connected between the control terminal of the switch circuit and an output terminal of the magnetic sensor.

    Step-down circuit
    9.
    发明授权

    公开(公告)号:US09893508B2

    公开(公告)日:2018-02-13

    申请号:US14805040

    申请日:2015-07-21

    IPC分类号: H02H3/08 H02H3/087 H02H3/20

    CPC分类号: H02H3/08 H02H3/087 H02H3/202

    摘要: A step-down circuit has a switch connected in series between a direct current power supply and a load. A switch control circuit is configured to turn the switch off when the voltage across the load is higher than a predetermined first threshold and turn the switch on when the voltage across the load is lower than the first threshold. An energy storage unit is charged by the power supply when the switch is on and supply power to the load when the switch is off. An overcurrent protection circuit turns the switch off when the input current of the switch is higher than a predetermined second threshold.