| 摘要 |
PROBLEM TO BE SOLVED: To reduce a switching noise by suppressing an increase in a switching loss of driving a voltage driving type power element having an emitter terminal for a gate drive and a main emitter terminal in a drive circuit, and to facilitate a protection at a vertical short circuiting time. SOLUTION: This drive circuit provides a gate current splitting circuit of a series circuit constitution of a Zener diode ZD for setting a current splitting voltage and a reverse preventive diode D between a main emitter terminal and a gate terminal of an insulated gate bipolar transistor. Thus, an induced voltage generated by an inductance part of an emitter wiring is split through a gate resistor Rg to regulate a switching speed at the insulated gate bipolar transistor on time. This circuit includes a constitution in which a resistor for regulating an amplitude of a gate current or a saturable reactor for regulating a splitting timing is added to a gate current splitting circuit. This circuit also includes an amplifier circuit for regulating a splitting current at on/off time in response to the induced voltage. COPYRIGHT: (C)2004,JPO
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