Universal power transistor base drive control unit

Details Universal power transistor base drive control unit Universal power transistor base drive control unit

1986-12-22

1988-06-07

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307280, 307300, 323289, H03K 326, H03K 333, G05F 140

Patent

active

047498765

ABSTRACT:
A saturation condition regulator system for a power transistor which achieves the regulation objectives of a Baker clamp but without dumping excess base drive current into the transistor output circuit. The base drive current of the transistor is sensed and used through an active feedback circuit to produce an error signal which modulates the base drive current through a linearly operating FET. The collector base voltage of the power transistor is independently monitored to develop a second error signal which is also used to regulate base drive current. The current-sensitive circuit operates as a limiter. In addition, a fail-safe timing circuit is disclosed which automatically resets to a turn OFF condition in the event the transistor does not turn ON within a predetermined time after the input signal transition.

REFERENCES:
patent: 4055794 (1977-10-01), Ickes
patent: 4215279 (1980-07-01), Lataire et al.
patent: 4318011 (1982-03-01), Zeis
patent: 4410810 (1983-10-01), Christen
patent: 4638240 (1987-01-01), Pauker et al.

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