Protection circuit for battery powered electronic devices

Details Protection circuit for battery powered electronic devices Protection circuit for battery powered electronic devices

1975-06-23

1977-01-25

Miller, J D

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

317 9B, 320 13, 307 10BP, H02H 324

Patent

active

040053440

ABSTRACT:
A rechargeable battery provides a source of operating potential for an electronic circuit load. An operator controlled on-off switch connects the battery to a relay, and through the normally open relay contacts, to the electronic circuit. The relay winding is returned to ground through a capacitor. When the switch is closed the relay is momentarily energized by the current which charges the capacitor. A transistor has its collector-emitter path in parallel with the capacitor and its base coupled to the movable tap on a voltage divider connected across the load. In the absence of a low voltage condition across the load, the transistor conducts maintaining relay closure for normal circuit operation.

REFERENCES:
patent: 3244899 (1966-04-01), Merle
patent: 3409802 (1968-11-01), Savage
patent: 3521142 (1970-07-01), Ludlam
patent: 3623131 (1971-11-01), Russell
patent: 3646354 (1972-02-01), Von Brimer
patent: 3648145 (1972-03-01), Meyer et al.
patent: 3723752 (1973-03-01), Overholt et al.

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