Power supply circuit and electronic device

Details Power supply circuit and electronic device Power supply circuit and electronic device

2007-09-25

2007-09-25

Berhane, Adolf (Department: 2838)

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

Reexamination Certificate

active

11206021

ABSTRACT:
A power supply circuit, wherein a power supply in a backup system is operational effectively even when a normal power supply to be used at a normal operation is turned off, including an A power supply system for supplying a first voltage to a circuit unit at a normal operation and a backup B power supply system, which starts to operate instantly when the A power supply system becomes abnormal to supply the first voltage to the circuit unit; wherein the B power supply system includes a regulator for outputting a second voltage equivalent to the first voltage, and a feedback circuit for detecting a voltage to be applied to the circuit unit and feeding back the detected voltage to the regulator; and the regulator adjusts an output voltage thereof, so that the voltage to be applied to the circuit unit becomes the first voltage when the voltage detected by the feedback circuit is lower than the first voltage.

REFERENCES:
patent: 5861736 (1999-01-01), Corsi et al.
patent: 02-307109 (1990-12-01), None
patent: 08-095649 (1996-04-01), None
patent: 11-175203 (1999-07-01), None

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