Patent ID: 9553444
Date: 2017-01-24
CPC Classifications: H02H

Claim:
1. A device for suppressing high-voltage electricity, wherein the device is electrically connected to a three-phase circuit of an electric generator, comprising: three up arm semiconductor switches each having a first terminal and a second terminal, wherein the first terminals of the up arm semiconductor switches are electrically connected together, and the second terminals thereof are electrically connected to coils of the three-phase circuit respectively; three low arm semiconductor switches each having a first terminal and a second terminal, wherein the first terminals of the low arm semiconductor switches are electrically connected to the second terminals of the up arm semiconductor switches respectively, and the second terminals thereof are electrically connected together; three reverse breakdown diodes, each of which has an anode and a cathode, wherein the anodes of the diodes are respectively electrically connected to the second terminals of the low arm semiconductor switches; the cathodes of the diodes are respectively connected to the first terminals of the low arm semiconductor switches; and a control circuit electrically connected to the low arm semiconductor switches, wherein the control circuit sending PWM (pulse width modulation) signals to turn on and off the low arm semiconductor switches; receives an alternating current outputted by the three-phase circuit, and converts the received alternating current to be provided to a battery; the device further comprises a detecting circuit; a side of the detecting circuit is connected to the three-phase circuit or the battery, and another side thereof is connected to the control circuit; when a voltage outputted by the three-phase circuit or a voltage provided to the battery sensed by the detecting circuit is higher than an upper-bound voltage, the detecting circuit outputs a signal to the control circuit, so that the control circuit is controlled to generate the PWM signals to sequentially turn on and off the low arm semiconductor switches.