Series voltage regulator with limited current consumption at low

Details Series voltage regulator with limited current consumption at low Series voltage regulator with limited current consumption at low

1984-11-07

1987-11-03

Salce, Patrick R.

Electricity: power supply or regulation systems

Output level responsive

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

363 18, G05F 156

Patent

active

047045728

ABSTRACT:
A series voltage regulator having a regulating transistor (T.sub.1) arranged with its emitter-to-collector path in a series arm of the regulator, the base of which is controlled via a control transistor (T.sub.2) by a first differential amplifier (V) which compares a reference voltage (U.sub.REF) with a voltage proportional to the voltage (U.sub.2) of the regulator output. A differential circuit (V.sub.2) which compares the collector-to-emitter voltage of the regulating transistor (T.sub.1) with an auxiliary voltage (U.sub.3) is provided, the output of which is followed by a current limiting circuit (T.sub.3) which acts upon control transistor (T.sub.2). The auxiliary voltage (U.sub.3) is larger than the collector-to-emitter voltage of the regulating transistor (T.sub.1) which occurs at the beginning of the saturation state of the regulating transistor. The current limiting circuit (T.sub.3) limits the current delivered by the control transistor (T.sub.2) to the base of the regulating transistor (T.sub.1) as soon as the differential circuit (V.sub.2) detects a drop in the collector-to-emitter voltage of the regulating transistor (T.sub.1) to the auxiliary voltage (U.sub.3). The auxiliary voltage (U.sub.3) may be controlled proportionally to the regulator output current.

REFERENCES:
patent: 3025451 (1962-03-01), Hakimoglu
patent: 3534249 (1970-10-01), Neill et al.
patent: 4633162 (1986-12-01), Melbert

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