| 摘要 |
PURPOSE:To simplify the drive circuit by connecting a large power MOS-FET and a conduction modulation type MOS transistor (TR) in parallel so as to cause a current flow to the titled circuit efficiently from a small to a large current. CONSTITUTION:The large power MOS-FET 10 and the conduction modulating MOS TR 11 of a switching circuit Q are connected in parallel, a drain D of the FET 10 and a collector C of the TR 11 are connected and a high potential A is applied to the connection point. Further, a low potential B is applied to the connection point between a source S of the FET 10 and an emitter E of the TR 11. The a control circuit 2 is connected in common to a gate G1 of the FET 10 via a resistor R1 and to a gate G2 of the TR 11 via a resistor R2. Then an ON signal from the control circuit 2 is fed to the circuit Q and a current from a small to a large current is given efficiently according to the voltage between the connecting points A and B to reduce the power load of the drive circuit.
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