| 摘要 |
PROBLEM TO BE SOLVED: To suppress each voltage driving type semiconductor element from having a voltage imbalance for prevention of application of overvoltage to the device and having destruction due to the overvoltage application, by reducing tail current occurring in turning off each device, in a power converter formed by connecting the plurality of voltage driving type semiconductor elements in series. SOLUTION: An illustration shows a gate drive circuir of the voltage driving type semiconductor element, which permits an interface circuit IF to turn on a switch SW1 at turn-on, so that it is turned on through a register Rg(on). At turn-off, conventionally, a switch SW2 was turned on and gate-driven at -15V through a register Rg(off). On the other hand, this gate drive circuit turns on a switch SW3 and is turned off, for example, at -20V, thus reducing tail current and suppressing each device from having voltage imbalance. COPYRIGHT: (C)2004,JPO
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