Power supply device for communication apparatus

Details Power supply device for communication apparatus Power supply device for communication apparatus

1995-04-14

1998-11-10

Fleming, Fritz

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 64, 307 65, 307 43, 358400, 358406, 323275, 323371, 455343, H02J 702

Patent

active

058348573

ABSTRACT:
This invention provides a facsimile apparatus which can reduce the consumption power of main power supply control means, and can suppress the charging frequency of a secondary battery without widening the operating voltage range of the main power supply control means.
The facsimile apparatus has a main power supply control unit. The main power supply control unit has a DC--DC converter which receives a power from a secondary battery, a solar battery, or a main power supply, and operates to maintain a constant output voltage, and a microcomputer driven by the output voltage from the DC--DC converter. The output voltage from the DC--DC converter is detected by a voltage detect circuit, and a voltage from the secondary battery is detected by another voltage detect circuit. The microcomputer performs control for supplying a power from the secondary battery or the solar battery to the DC--DC converter, control for charging the secondary battery by the main power supply or the solar battery, and the like.

REFERENCES:
patent: 4249245 (1981-02-01), Nakanishi et al.
patent: 4401895 (1983-08-01), Petkovsek
patent: 4567322 (1986-01-01), Tsuda
patent: 5046136 (1991-09-01), Tokunaga et al.
patent: 5157271 (1992-10-01), Fujiwara
patent: 5384624 (1995-01-01), Kajiwara
patent: 5414306 (1995-05-01), Kanno et al.
patent: 5418604 (1995-05-01), Nagakura et al.

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