| 摘要 |
PROBLEM TO BE SOLVED: To provide a gate control circuit of a semiconductor element for power, which can restrictively limit active clamp operation.SOLUTION: The gate control circuit of the semiconductor element for power is comprised of: gate signal generation means 1 for generating a gate reference signal; gate driving means 2 including an active clamp circuit which amplifies the gate reference signal, supplies a gate signal to the semiconductor element for power, and when collector voltage overshoots and exceeds a predetermined threshold when turning off the semiconductor element for power, applies ON voltage to a gate of the semiconductor element for power; gate feedback voltage detection means which detects the voltage of a gate as a feedback voltage, and when the feedback voltage value exceeds a predetermined value, determines the feedback voltage as an ON level; and OFF-time gate inconsistency detection means 5 which, when the feedback voltage is turned to the ON level when the gate reference signal is a turn-off command state, outputs an inconsistency signal. When the inconsistency signal is obtained, the gate signal generation means 1 performs gate block after lapse of predetermined time. |
