Battery charging protection circuit

Details Battery charging protection circuit Battery charging protection circuit

1987-04-08

1987-12-15

Shoop, Jr, William M.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 64, 307150, 365229, H02J 902

Patent

active

047135557

ABSTRACT:
A battery charging protection circuit for use in a power controller circuit utilizes the base emitter junction of a first NPN bipolar transistor to permit current to flow only from a backup battery input terminal to a power supply voltage output terminal of the power controller circuit. The base emitter junction and base collector junction of a second bipolar transistor are used to permit current to flow only in the direction from the backup battery input terminal to the substrate of the power controller circuit.

REFERENCES:
patent: 4104538 (1978-08-01), Davies
patent: 4288865 (1981-09-01), Graham
patent: 4451742 (1984-05-01), Aswell
patent: 4617473 (1986-10-01), Bingham
patent: 4629905 (1986-12-01), Kraicar
patent: 4638175 (1987-01-01), Bradford et al.
patent: 4645943 (1987-02-01), Smith et al.

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