它限制每个电容器的充电电流，并在电容器发生短路时保护继电器。
It limits the charging current of each capacitor and also protects the relays in case a capacitor becomes short-circuited.
该二极管象一个可变的电阻。当电容器的充电电流很大时，其阻值很低；而电流随时间变小时，其阻值增大。
The diode ACTS like a variable resistance, low when the charging current to the capacitor is high, then increasing in value as the current decreases with time.
因此，电容器C4(穿过电阻器R2和IGBTQ2)的充电电流也受到限制，由此不会有部件被击穿。
Hence, the charging current of capacitor C4 (running through resistor R2 and IGBT Q2) is also limited so that no components can break down.
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