| 摘要 |
<P>PROBLEM TO BE SOLVED: To substantially uniform voltage sharing, even when there is a difference in the collector voltage at turn-off due to the variation in the characteristics of voltage-driven type semiconductor elements. Ž<P>SOLUTION: The semiconductor switch circuit includes voltage uniformizing circuits 22, having a structure in which connection lines between collectors of three or more voltage-driven type semiconductor elements connected in series, and a gate drive circuit are magnetically coupled via a common mode reactor; a capacitor and a resistor are connected in series to a magnetically coupled winding of the reactor and the one is connected to a collector of each of voltage-driven type semiconductor elements; and the other is connected to each of the gate resistances. In the semiconductor switch circuit, when a reactor of at least one of the voltage uniformizing circuits 22 is magnetically coupled to reactors 16 of the other two or more voltage uniformizing circuits 22, own voltage uniformizing circuit 22 has a structure, in which capacitors 17 are connected in series to the magnetically coupled windings of reactors 16 respectively; and the magnetically coupled windings are connected in parallel, and resistors 18 arranged together into a single unit is connected in series to the parallel connected magnetically coupled windings. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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