PROTECTION CIRCUIT FOR SEMICONDUCTOR SWITCHING ELEMENT AND POWER CONVERSION DEVICE Russian patent published in 2018 - IPC H03K17/16 H02M1/00 H03K17/08 H03K17/10 

FIELD: electricity.

SUBSTANCE: in the protection circuit for each of many semiconductor switching elements 50, connected in series, between the collector and emitter of semiconductor switching element 50 a serial chain composed of avalanche elements D1~D5, the resistor R4 and avalanche element D6, is connected. The capacitor C1 and the resistor R1 are connected in parallel between both terminals of the avalanche element D4, and the capacitor C2 and the resistor R2 are connected in parallel between both terminals of the avalanche element D5. Between the common connection point of the resistor R4 and avalanche element D6 and gate of semiconductor switching element 50 a sequential circuit is connected, consisting of a resistor R5, a branch circuit consisting of a capacitor C3 and resistor R6, and serial component including Zener diodes ZD1 and ZD2, connected in reverse polarity relative to each other.

EFFECT: reducing the risk of failure of the semiconductor switching element due to a breakdown caused by overvoltage.

5 cl, 7 dwg