| 摘要 |
PROBLEM TO BE SOLVED: To reduce loss of a circuit for driving the base of a bipolar transistor and a switching loss upon turning off thereof. SOLUTION: A unipolar transistor is connected between a base 3 and an emitter 4 of a bipolar transistor. When the bipolar transistors are of Darlington connection type, a unipolar transistor is connected between the base of each of the bipolar transistors and an emitter of the final stage of bipolar transistor. A base current is externally supplied to the semiconductor device in the on mode, the supply of the base current is stopped in an off mode to apply a voltage to a gate terminal G to turn on the unipolar transistor and to discharge excessive carriers in the base region 3 of the bipolar transistor.
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