Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
September 12, 2006
Patent Application Number
11232869
Date Filed
September 23, 2005
Patent Primary Examiner
Patent 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.
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