Circuit for use with a voltage regulator

Details Circuit for use with a voltage regulator Circuit for use with a voltage regulator

1989-10-02

1991-06-18

Stephan, Steven L.

Electricity: power supply or regulation systems

Output level responsive

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

323269, 361 18, G05F 144

Patent

active

050252038

ABSTRACT:
A circuit (2) for use with an automotive voltage regulator (16), having: an input node (4) for receiving an input voltage (V.sub.BAT); an output node (12) for producing a regulated output voltage (V.sub.REG); a control node (18) for receiving a control signal from the voltage regulator; a first transistor (10) having its emitter connected via a protection diode (6) to the input node, its collector connected to the output node, and its base connected to the control node; an electrolytic input capacitor (8) connected between the first transistor emitter and ground; an electrolytic output capacitor (14) connected between the output node and ground; and a second transistor (32) having its emitter connected to the input node, its collector coupled to the output node, and its base for coupling to the voltage regulator. The second transistor allows the circuit to provide regulation at a lower input voltage, while retaining the protection diode. The circuit may be fabricated in integrated circuit form, possibly including the voltage regulator.

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