Power conversion circuit having off-voltage control circuit

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 upper-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 corresponding to termination of turn-off operation of the upper arm and termination of turn-on operation of the lower arm,
• the off-voltage control circuit controls the output voltage of the upper-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 upper arm during a time period from termination of turn-off operation of the upper arm until start of turn-on operation of the lower arm, and to generate the first voltage instead of the second voltage at and after termination of the turn-on operation of the lower arm.