Power supply backup circuit

Details Power supply backup circuit Power supply backup circuit

1990-03-15

1992-06-02

Pellinen, A. D.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 72, 307 85, H02J 906

Patent

active

051189623

ABSTRACT:
Improvements to a power supply backup circuit used to backup the operation of a radio device or the like when a power supply therefor is interrupted. A reverse current preventing diode is connected such that its anode is connected to the junction point of a DC power source and a voltage stabilizing circuit and such that its cathode is connected to the stabilizing circuit. A transistor is provided which has a collector connected to the cathode of the diode, an emitter connected to one end of a capacitor, the other end of which is grounded, and a base connected to a DC power source via a first resistor, and which has a second resistor connected across the base and emitter thereof. A third resistor is further connected across the collector and emitter of the transistor.

REFERENCES:
patent: 3784841 (1974-01-01), Hosaka
patent: 4227257 (1980-10-01), Satoh
patent: 4795914 (1989-01-01), Higa et al.

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