CIRCUIT FOR CHARGING, EMERGENCY LIGHTING DEVICE, AND LIGHTING DEVICE

PROBLEM TO BE SOLVED: To make judgment properly about the life of a battery when it is charged, to attain power saving and life prolongation. SOLUTION: An arithmetic operation control unit 16 turns a switch 17 of DC power on/off from a converter circuit 15 so as to intermittently charge a battery 13...

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Bibliographic Details
Main Authors SATO KIMIHITO, IWAI NAOKO
Format Patent
LanguageEnglish
Published 16.06.2005
Edition7
Subjects
BASIC ELECTRIC ELEMENTS
CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRIC HEATING
ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
GENERATION
PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY
SYSTEMS FOR STORING ELECTRIC ENERGY
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Summary:PROBLEM TO BE SOLVED: To make judgment properly about the life of a battery when it is charged, to attain power saving and life prolongation. SOLUTION: An arithmetic operation control unit 16 turns a switch 17 of DC power on/off from a converter circuit 15 so as to intermittently charge a battery 13. The operation control unit 16 obtains difference voltage between the battery voltage when auxiliary charge is started in the case of intermittent charge and the battery voltage when the auxiliary charge is ended. When the internal resistance value of the battery 13 obtained by dividing the difference voltage by the charge current obtains a prescribed value or more, a life of the battery is judged. When the life of the battery is judged, an output apparatus 22 informs a user of the result of judgement. COPYRIGHT: (C)2005,JPO&NCIPI
Bibliography:Application Number: JP20040278553