Power supply circuit

Details Power supply circuit Power supply circuit

Filed on

1996-04-17

Date issued

1997-12-30

Examiner

Sircus, Brian

Patent Class

Electrical transmission or interconnection systems

SubClass

Plural supply circuits or sources

SubSubClass

Substitute or emergency source

Other Related Categories

307 66, 307 80, 307 83, 307 97, 320 2, 323265, 323271, H02J 906

Type

Patent

Status

active

Patent number

057034150

Description

ABSTRACT:
A power supply circuit is provided with a first battery, a second battery, an output terminal, and a voltage dividing circuit for dividing a voltage from the first battery. An output voltage of the dividing circuit is compared with a voltage of the second power source by a comparing circuit. A first P-channel-type MOSFET is connected between the first battery and the output terminal. A second P-channel-type MOSFET is connected between the second battery and the output terminal. Depending on an output from the comparing circuit, one of the MOSFET is turned on, and the other is turned off.

REFERENCES:
patent: 4323788 (1982-04-01), Smith
patent: 4427899 (1984-01-01), Bruns
patent: 4617473 (1986-10-01), Bingham
patent: 4785226 (1988-11-01), Fujisawa et al.
patent: 4788450 (1988-11-01), Wagner

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