| 摘要 |
PROBLEM TO BE SOLVED: To obtain a gate drive circuit which reduces a loss generated at a time when a short-circuit current is cut off. SOLUTION: When a circuit detects that a short-circuit current Ic flows to a voltage drive element such as an insulated-gate bipolar transistor(IGBT) or the like, a transistor TR4 which is shown in (a) is turned on. Thereby, as shown in (b), the gate-emitter voltage VGE of the IGBT is lowered down to the Zener voltage of a Zener diode ZD10. As a result, the short-circuit current Ic is reduced, and the burden of the IGBT is reduced at the initial stage of a short circuit. |
