| 摘要 |
PURPOSE:To simply construct a drive circuit by obtaining a voltage applied between the gate and the source by a DC power source connected with an inverter. CONSTITUTION:When a transistor 8 is turned ON in a drive circuit 4, a current is flowed from a DC power source 1 in a circuit of resistors R5, R6, and the transistor 8, thereby applying a voltage between the source terminal 5 of a MOSFET 2-1 and a gate terminal D, and the MOSFET 2-1 is shifted to ON state. A Zener diode ZD1 prevents the gate of the MOSFET 2-1 from becoming an overvoltage, and the Zener voltage is normally set to approx. 15V. Thus, since the transistor 8 used as a drive semiconductor switch is operated in the saturated state, its loss can be reduced, and the drive circuit can be simplified. |
