| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that a gate current is wastefully passed through a semiconductor device from a semiconductor switching device even in a commutation period during which the current runs through a commutation diode connected with the semiconductor device in antiparallel mode. SOLUTION: The semiconductor switching device (GDU) is structured so that the voltage between a gate/a cathode (G/K) of the semiconductor device may change by a voltage drop generated by the commutation diode. The gate current outputted from the semiconductor switching device, when the voltage change is detected by a circulating period detecting means (5), is decreased to a degree that the semiconductor device does not turn off by a gate current decreasing means (5). COPYRIGHT: (C)2004,JPO&NCIPI
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