| 摘要 |
PROBLEM TO BE SOLVED: To prevent an overvoltage from being applied to specific one of a plurality of voltage-driven semiconductor devices connected in series by equalizing the timing of switching in turning on and off the devices, monitoring the overvoltage in the individual devices after turn-off, and turning on the device again. SOLUTION: The gate wire or emitter wire of the voltage-driven semiconductor device at each stage is magnetically coupled with the gate wire or emitter wire of the device at the next stage. The overvoltage in the individual devices after turn-off is monitored through gate drive circuits. The device to which the overvoltage is applied is subjected to gate voltage control, and the device is turned on again in an active region. COPYRIGHT: (C)2003,JPO
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