Patent ID: 8363440
Filing Date: 2013-01-29
Classification: H02M

Abstract:
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, and a lower-arm gate drive circuit configured to drive the lower arm, wherein the 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.