| 摘要 |
PROBLEM TO BE SOLVED: To reduce the voltage rating of a device by suppressing switching loss and switching time increase and eliminating the need for a snubber circuit. SOLUTION: When, for example, the voltage between the gate and emitter of an IGBT that is a voltage drive type element is monitored by a comparator CMP 1 and reaches a setting value VGE or less, a gate condition control signal is outputted for a certain amount of time after a fixed amount of time by a delay circuit 2 and a one-shot circuit 3, thus changing the gate drive conditions, extending the turn-off time of the IGBT, and reducing the change rate in a collector current. |
