Backup battery charging circuit

Details Backup battery charging circuit Backup battery charging circuit

2006-09-12

2006-09-12

Tibbits, Pia (Department: 2838)

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

Reexamination Certificate

active

07105951

ABSTRACT:
An object of the invention is to provide a backup battery charging circuit capable of continuing to charge a backup battery to the limit of the voltage drop of a main battery so as to reduce the possibility of data disappearance to an achievable extent. For this purpose, a backup battery charging circuit comprises: a main battery serving as a power supply; a backward current protection diode; a regulator circuit using the main battery as the power supply; a limiting resistor; a backup battery; a switch for performing direct charging from the main battery; and a comparator for determining whether the regulator circuit or the switch is to be used.

REFERENCES:
patent: 5666041 (1997-09-01), Stuart et al.
patent: 2005/0068006 (2005-03-01), Matsunaga
patent: 2298892 (1976-09-01), None
patent: 07273717 (1995-10-01), None
patent: 2001025161 (2001-01-01), None
patent: 2001051735 (2001-02-01), None
JPO Computer Translation of JP-2001025161.

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