Protection circuit for battery powered electronic devices

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

H - Electricity

02

H

320/11

H02H 7/20 (2006.01) H02H 3/24 (2006.01) H02H 7/18 (2006.01) H02H 11/00 (2006.01) H02J 7/00 (2006.01)

Patent

CA 1049610

ABSTRACT OF THE DISCLOSURE 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 top 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. - 1 -

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