CMOS backup power switching circuit

Details CMOS backup power switching circuit CMOS backup power switching circuit

1984-01-03

1986-10-14

Pellinen, A. D.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307362, 365229, H02J 906

Patent

active

046174737

ABSTRACT:
A load circuit is provided with a backup power supply to power the essential functions of the load in the event that its primary power supply fails or is otherwise degraded. The positive terminals of both the primary power supply and the backup power supply, having a common negative reference, are input to a differential voltage comparator circuit. The output of the differential voltage comparator circuit controls a switching transistor located in a line between the primary power supply and the load, and when inverted by an inverter circuit, controls a second switching transistor located in a line between the backup power supply and the load. In operation, only the more positive of the primary power or the backup power supply voltages is provided to the load. The output of the inverter circuit is also available to indicate which of the two sources the power is applied to the load, and may be further used to disable non-essential portions of the load circuitry.

REFERENCES:
patent: 4288865 (1981-09-01), Graham
patent: 4384350 (1983-05-01), Lee et al.
patent: 4451742 (1984-05-01), Aswell
patent: 4463270 (1984-07-01), Gordon
patent: 4484084 (1984-11-01), Cheffer
patent: 4492876 (1985-01-01), Colbert et al.
patent: 4498040 (1985-02-01), Tatsushi et al.

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