Transistor base current regulator

Details Transistor base current regulator Transistor base current regulator

1986-05-08

1987-08-04

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323280, G05F 156

Patent

active

046848789

ABSTRACT:
The collector-to-emitter voltage (V.sub.CE) of a transistor switch and its base drive are designed to have maximum specified values when the transistor switch conducts the highest specified load current. The base drive to the transistor switch is reduced when the load current is reduced, or when the beta of the transistor increases or is greater than a minimum specified value. The base drive to the transistor switch is regulated by sensing the V.sub.CE of the transistor switch and producing a control current which decreases with decreasing V.sub.CE and increases with increasing V.sub.CE. The control current is then used to supply a regulated base current to the transistor switch while maintaining the V.sub.CE of the transistor below, the maximum specified value, for values of load current below the maximum specified level.

REFERENCES:
patent: 3100863 (1963-08-01), McCullough
patent: 3405319 (1968-10-01), Barringer
patent: 3579089 (1971-05-01), Giess et al.

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