D-C Power supply for providing non-interruptible d-c voltage

Details D-C Power supply for providing non-interruptible d-c voltage D-C Power supply for providing non-interruptible d-c voltage

1980-10-02

1982-04-06

Gellner, Michael L.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

320 14, 320 15, H02J 700

Patent

active

043237886

ABSTRACT:
To maintain a continuous non-interruptible d-c operating voltage for powering a load, where the operating voltage is produced from a-c line voltage subject to failure or low voltage transients, the required operating voltage is provided by two rechargeable batteries which are alternately connected to the load. While one battery supplies the d-c power to the load, the other battery is being charged by a battery charger which is driven by the a-c line voltage. As the active battery slowly discharges and the d-c operating voltage drops to a predetermined threshold level, the battery connections are automatically switched, the charged battery being connected to the load while the discharged battery is coupled to the battery charger for recharging. The connections to and from the batteries include SCR's which receive gating pulses only when a battery switch is to occur. No continuous gating signal is needed. In the event of an a-c power outage or failure, the d-c operating voltage applied to the load will not be interrupted, nor will a momentary drop occur during the transition from one battery to the other. Moreover, by cycling each battery through its charge-discharge curve the battery's ampere-hour capacity is maintained.

REFERENCES:
patent: 3577003 (1971-05-01), Behr

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