| 摘要 |
PROBLEM TO BE SOLVED: To suppress the oscillation of collector voltage and reduce the value of collector voltage becoming a constant value in a current limiting area in the case where an IGBT is used as a semiconductor device for ignition. Which is used for an igniter ignition circuit. SOLUTION: In the case where the collector voltage is higher than the gate voltage while current is being limited, an increase in the collector voltage directly after the start of current limiting increases the voltage of a gate terminal by using a constant current circuit 4 comprising a high voltage resistant constant current element 2 and a low voltage resistant constant current element 3 connected in series for a circuit wherein voltage is applied between a collector terminal and a gate terminal when micro current flows from the collector terminal to the gate terminal. Then, an increase in the gate voltage suppresses a sudden increase in collector voltage. In addition, when collector voltage is lowered by oscillation, an action to increase gate voltage from the collector terminal is eased, suppressing the lowering of collector voltage. In addition, collector current is suppressed by the low pressure resistant constant current element 2, reducing the generation loss of an IGBT.
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