High withstand voltage Darlington transistor circuit

Details High withstand voltage Darlington transistor circuit High withstand voltage Darlington transistor circuit

1984-12-12

1986-10-07

Miller, Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307254, 307300, 307296R, H03K 1908

Patent

active

046161449

ABSTRACT:
A high withstand voltage Darlington transistor circuit is comprised of a Darlington transistor and a bypass circuit. This bypass circuit is comprised of a bypass transistor whose collector is connected to the base of an earlier stage transistor of the transistors which make up the Darlington transistor and whose emitter is connected to the base of a later stage transistor. The base of the bypass transistor is connected to the collector of the Darlington transistor via a diode and the resistor. When the collector-emitter voltage of the Darlington transistor crosses a specified value, the bypass transistor operates and a base current of the Darlington transistor is supplied to the base of the later stage transistor without being supplied to the earlier stage transistor. The result is that the current amplification ratio of the Darlington transistor is substantially decreased, and the withstand voltage is substantially increased.

REFERENCES:
patent: 4404478 (1983-09-01), Rischmuller
patent: 4539492 (1985-09-01), Michel et al.
Nishiumi et al., "High Voltage High Power Transistor Modules for 440 V AC Line Voltage Inverter Applications," IPEC, Conf. Rec., vol. 1, p. 297, Mar. 1983.

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