同时断开电容器C3与地的连接，由此电容器C4上的负载电压波动不会影响IGBTQ2的栅极电压。
The same time capacitor C3 is disconnected from the ground so that the load voltage ripple on capacitor C4 does not influence the gate voltage of IGBT Q2.
同时断开电容器C3与地的连接，由此电容器C4上的负载电压波动不会影响IGBTQ2的栅极电压。
The same time capacitor C3 is disconnected from the ground so that the load voltage ripple on capacitor C4 does not influence the gate voltage of IGBT Q2.
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