Power supply switching arrangement

Details Power supply switching arrangement Power supply switching arrangement

1983-07-18

1985-01-08

Pellinen, A. D.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

365229, H02J 906

Patent

active

044928769

ABSTRACT:
In an electrical circuit where power supply interruptions may cause significant adverse consequences, a secondary battery is often used to maintain power when the load voltage falls below a predetermined threshold. MOS transistors interconnect primary and secondary voltage supplies with the load. A sequence control circuit assures that only one MOS transistor is on at any time. In one embodiment of the invention, different time constants cause all MOS transistors to turn off before changing voltage supplies. In another embodiment of the invention, voltage comparators, each having a different threshold, cause all MOS transistors to turn off before changing voltage supplies. A capacitor maintains the load voltage during switching and positive feedback assures that the switching interval is brief. This arrangement is particularly advantageous in low power applications utilizing one or more lithium batteries.

REFERENCES:
patent: 3414802 (1968-12-01), Harrison et al.
patent: 3577003 (1971-05-01), Behr
patent: 3631257 (1971-12-01), Behr
patent: 3696286 (1972-10-01), Ule
patent: 4122353 (1978-10-01), Breikss
patent: 4288865 (1981-09-01), Graham
patent: 4384350 (1983-05-01), Lee et al.
patent: 4456833 (1984-06-01), Traus et al.
"Ram Dons Lithium-cell Hat for Convenient Nonvolatility" by Michael Bolan, Electronics 6/30/83, pp. 147-150.

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