Standby power unit

Details Standby power unit Standby power unit

H - Electricity

04

M

320/4

H04M 19/00 (2006.01) H02J 9/06 (2006.01)

Patent

CA 1173902

ABSTRACT Standby power supplies for key telephone systems are known which derive 24 VDC, for charging a battery, from commercial power mains, e.g. 117 VAC, and also derive 10 volt AC for energizing lamps, bells, and the like in the telephone system. These systems are bulky and expensive. The present invention, which is smaller and less expensive, is normally powered by 10 volt AC from the key telephone system and this 10 volt AC is fed to a charger which trickle charges the 24 V battery supply. In the event of a commercial power interruption the charger is automatically disconnected from the 10 volt AC and power is derived from the battery supply which drives a 10 volt AC inverter to power the lamps, etc. in the key system.

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