Automatic bias-controlled VMOS/bipolar dual-triggered switch

Details Automatic bias-controlled VMOS/bipolar dual-triggered switch Automatic bias-controlled VMOS/bipolar dual-triggered switch

1980-04-07

1982-06-29

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361101, 361 93, H02H 308

Patent

active

043374948

ABSTRACT:
An automatic bias-controlled power switching system including a bipolar power transistor driven by means of first and second VMOS transistors which are sequentially triggered to initially turn the power transistor on to at least an unsaturated conduction state and thereafter to drive the power transistor into saturation. The VMOS transistors are turned off in sequence so that when turned off the power transistor is initially brought into an unsaturated conduction state after which it is completely turned off. An automatic gain control system monitors the bipolar power transistor and varies the base current thereto so that the operating point of the power transistor remains fixed. A fault detection system is provided to turn off the bipolar power transistor when excessive current is demanded by the load on the transistor. In addition, a base current limit control system monitors the level of the base current and, when the base current exceeds a predetermined limit, at least one of the VMOS transistors are controlled to reduce the base current to the predetermined desired maximum level.

REFERENCES:
patent: 3896367 (1975-07-01), Frantz
patent: 3916220 (1975-10-01), Roveti
patent: 4055794 (1977-10-01), Ickles et al.
patent: 4178619 (1979-12-01), Seiler et al.

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