| 摘要 |
PROBLEM TO BE SOLVED: To provide a power semiconductor switching circuit capable of suppressing failure due to saturation current fluctuation of a power semiconductor switching element due to temperature variation. SOLUTION: A power supply voltage which a power supply voltage stabilizing circuit 5 outputs to a drive circuit 4 is adjusted so that a saturation current variation in a power semiconductor switching element 1 by a temperature variation tends to decline, based on a temperature of the power semiconductor switching element 1 which is detected by a temperature detecting circuit 3 and a relationship between the temperature stored in advance and the power supply voltage of the drive circuit 4. Since variation in saturation current decreases even if a temperature variation occurs in the power semiconductor switching element 1, various protection control can be executed with less margin. COPYRIGHT: (C)2010,JPO&INPIT
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