Power switch for dual power supply circuit

Details Power switch for dual power supply circuit Power switch for dual power supply circuit

1984-11-09

1987-10-06

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307243, 307296R, H03K 1756, H03K 17687

Patent

active

046985301

ABSTRACT:
A power switching circuit 12 for automatically switching between line-driven and battery power supplies 28 and 30 is disclosed. The power switching circuit selectively connects first and second input voltage terminals Vdd and Vbb to an output voltage terminal Vzz. When the line-driven power supply is on, a first transistor Q1 switches on to connect the first input voltage terminal to the output voltage terminal, and a second transistor Q2 switches off to isolate the battery. When the line-driven power supply is off, the first transistor switches off, and the second switches on to connect the battery powered second input voltage terminal to the output voltage terminal.

REFERENCES:
patent: 3959669 (1976-05-01), Peters
patent: 4375701 (1983-03-01), Hanson
patent: 4465945 (1984-08-01), Yin
patent: 4540893 (1985-09-01), Park
patent: 4540894 (1985-09-01), Bloomer

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