Constant voltage source circuit

Details Constant voltage source circuit Constant voltage source circuit

1989-07-05

1991-01-08

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

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

323275, 323281, 323303, G05F 156

Patent

active

049839055

ABSTRACT:
A constant voltage source circuit which is provided with an output transistor (Q.sub.1) for outputting a predetermined output voltage (V.sub.0) in accordance with an input voltage (V.sub.IN) and a differential amplifier (A), and is further characterized in that the circuit further comprises a reference voltage control means which monitors variations of the input voltage (V.sub.IN) and outputs a predetermined constant voltage to the differential amplifier (A) as a reference voltage when the input voltage (V.sub.IN) is higher than, a predetermined voltage level, and a voltage varied in accordance with the variation of the input voltage (V.sub.IN) is output therefrom to the differential amplifier (A) as a reference voltage when the input voltage (V.sub.IN) falls below a predetermined voltage level.

REFERENCES:
patent: 3939399 (1976-02-01), Funatsu et al.
patent: 4319179 (1982-03-01), Jett, Jr.
patent: 4327319 (1982-04-01), Swisher et al.
patent: 4771226 (1988-09-01), Jones
patent: 4814687 (1989-03-01), Walker

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