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Power conversion circuit having off-voltage control circuit

  • US 8,363,440 B2
  • Filed: 12/16/2009
  • Issued: 01/29/2013
  • Est. Priority Date: 12/17/2008
  • Status: Active Grant
First Claim
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1. A power conversion circuit, comprising:

  • an upper arm connected to a high-voltage side;

    a lower arm connected to a low-voltage side;

    an upper-arm gate drive circuit configured to drive the upper arm, anda lower-arm gate drive circuit configured to drive the lower arm, whereinthe upper-arm gate drive circuit includes an upper-arm gate drive power supply and an upper-arm arm-drive circuit, and the lower-arm gate drive circuit includes a lower-arm gate drive power supply and a lower-arm arm-drive circuit,the upper-arm gate drive power supply and the lower-arm gate drive power supply supply a voltage to a control terminal of the corresponding upper or lower arm,the upper-arm arm-drive circuit and the lower-arm arm-drive circuit, receiving a control signal for controlling the corresponding upper or lower arm, output an arm drive signal according to the control signal,the lower-arm gate drive circuit further includes a signal output circuit and an off-voltage control circuit,the signal output circuit outputs a voltage adjustment signal responding to termination of turn-off operation of the lower arm and termination of turn-on operation of the upper arm,the off-voltage control circuit controls the output voltage of the lower-arm gate drive power supply, in response to the voltage adjustment signal from the signal output circuit, to generate a second voltage lower than a first voltage satisfying an off state of the lower arm during a time period from termination of turn-off operation of the lower arm until start of turn-on operation of the upper arm, and to generate the first voltage instead of the second voltage at and after termination of the turn-on operation of the upper arm.

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