| 摘要 |
PROBLEM TO BE SOLVED: To provide a charging control circuit which is capable of reducing the power loss due to a charging/discharging control circuit in the initial charging stage of a battery. SOLUTION: A DC voltage V0 supplied from a DC power source 1 to a load connected to an output terminal 2 is controlled by the resistance values (sense resistance values) of sense resistors 13 and 14 connected to a sense terminal S. A charging/discharging control circuit 6 is connected between the positive terminal of a battery 3 and the output terminal 2, and when the battery 3 is in a discharging state, makes the battery 3 charged with a constant current from the DC power source 1. The charging/discharging control circuit 6 is provided with a charging voltage control circuit, which controls the sensor resistance values of the resistors 13 and 14 so that the output voltage V0 of the DC power source 1 becomes higher than a terminal voltage VB of the battery 3 by a fixed value +ΔV in the initial charging stage, and the battery 3 is charged to a constant voltage in the final charging state.
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