CHARGE CONTROL CIRCUIT AND CHARGING CIRCUIT

PROBLEM TO BE SOLVED: To generate a voltage for charging a secondary battery having a full charge voltage higher than an input voltage.SOLUTION: A charge control circuit comprises: a comparator circuit for comparing a voltage of a secondary battery with a comparison voltage depending on a voltage of...

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Bibliographische Detailangaben
Hauptverfasser:	AMAMIYA KEIJI, HAYASHI YASUAKI
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS BASIC ELECTRIC ELEMENTS CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER 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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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To generate a voltage for charging a secondary battery having a full charge voltage higher than an input voltage.SOLUTION: A charge control circuit comprises: a comparator circuit for comparing a voltage of a secondary battery with a comparison voltage depending on a voltage of an input power supply; a first transistor connected to the input power supply to supply an input current to an inductor of a step-up DC-DC converter; a first control circuit for controlling the first transistor; and a second control circuit for controlling a step-up operation of the step-up DC-DC converter. If the voltage of the secondary voltage is equal to or higher than the comparison voltage, the first control circuit turns on the first transistor, and the second control circuit complementarily switches second/third transistors for increasing/decreasing an inductor current to trigger a step-up operation of the step-up DC-DC converter. If the voltage of the secondary battery is lower than the comparison voltage, the first control circuit controls the first transistor to bring the input current at a predetermined value, and the second control circuit turns off the second transistor and turns on the third transistor.