Voltage regulator with reduced semiconductor power dissipation

Details Voltage regulator with reduced semiconductor power dissipation Voltage regulator with reduced semiconductor power dissipation

1989-12-12

1991-04-23

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

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

323275, 323280, G05F 156

Patent

active

050102923

ABSTRACT:
A series pass voltage regulator is provided which has reduced power dissipation in the semiconductor components of its output stage. The output stage includes first and second impedances which are electrically connected in parallel for collectively carrying a load current supplied at an output of the regulator. The first impedance comprises the series combination of a transistor collector-emitter output impedance and a resistor, while the second impedance comprises the series combination of a transistor collector-emitter output impedance and two diodes. The bases of the two transistors are coupled to the output of an error amplifier to effect control of the output impedances. In all high load current situations, the resistor dissipates more than 75% of the power dissipated in the output stage.

REFERENCES:
patent: 3120635 (1964-02-01), Tully, Jr.
patent: 3158800 (1964-11-01), McPherson
patent: 3541425 (1970-11-01), Weidmann
patent: 3684924 (1972-08-01), Miller, Jr.
patent: 3906310 (1975-09-01), Esashika
patent: 4374356 (1983-02-01), Hashimoto
patent: 4731574 (1988-03-01), Melbert
patent: 4792747 (1988-12-01), Schroeder

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