CHARGING CIRCUIT

PROBLEM TO BE SOLVED: To provide a charging circuit for feeding more charging current while suppressing heat generated by a transistor essential for charging. SOLUTION: A charging circuit consists of an external power supply, a step-down DC/DC converter for stepping down the voltage of an external p...

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Hauptverfasser:	OHASHI KAZUMICHI, MOMOSE SHIGERU, NEGI TAKESHI, NOMATA MASANORI
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER 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 provide a charging circuit for feeding more charging current while suppressing heat generated by a transistor essential for charging. SOLUTION: A charging circuit consists of an external power supply, a step-down DC/DC converter for stepping down the voltage of an external power supply, a secondary battery E that is charged by the output of the step-down DC/DC converter, and a step-up DC/DC converter IC2 where the output of the step-down DC/DC converter or the secondary battery E is outputted and output after step-up is used as a system power supply, thus varying the output voltage of the step-down DC/DC converter according to a battery voltage and at the same time making constant the output voltage of the step-up DC/DC converter when the output voltage of the step-up DC/DC converter IC2 reaches a preset voltage.