Circuit for regulating the base current of a semiconductor power

Details Circuit for regulating the base current of a semiconductor power Circuit for regulating the base current of a semiconductor power

1990-02-14

1991-06-25

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

3072966, 307356, 307315, 323315, H03K 301, H03K 326

Patent

active

050270044

ABSTRACT:
A circuit for regulating the base current of a semiconductor power device is accomplished with a first amplifier which measures the difference in potential across a first detection resistance which is passed through by a base current, with a second amplifier, which measures the voltage across a second detection resistance passed through by the emitter current of the power device, and with a means sensitive to the difference between a current, present at the output of the first amplifier, and a current present at the output of the second amplifier.
Said sensitive means, acting on a variable current generator, maintains currents I.sub.1 and I.sub.2 equal to one another, and thus maintains constant the ratio between the emitter current of the powder device and the base current of the same.

REFERENCES:
patent: 4638239 (1987-01-01), Hachimori
patent: 4703249 (1987-10-01), De La Plaza et al.
patent: 4814724 (1989-03-01), Tanigawa
patent: 4879524 (1989-11-01), Bell
patent: 4950976 (1990-08-01), Wagoner

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