| 摘要 |
PURPOSE:To obtain a charging control system high in working efficiency by removing a DC/DC converter when the ratio between the input voltage and the output voltage of the DC/DC converter is kept between the conversion efficiency of the DC/DC converter and the reciprocal of said conversion efficiency. CONSTITUTION:When an accumulator 3 has a level less than a full charge mode, the DC voltage generated by a solar battery 1 is raised or dropped via a DC/DC converter 5 after a switch 12 is closed. Then a charging current and a load current are supplied to the accumulator 3 and the load 4 respectively in response to the output voltage of the converter 5. While the rise and drop are nor required for the output voltage of the battery 1 by the function of the converter 5 when the ratio between the output voltage V0 and the input voltage Vi of the converter 5 is kept between the conversion efficiency FC of the converter 5 and its reciprocal 1/FC. Thus an input/output voltage comparison control circuit 9 opens the switch 12 and separates the converter 5 from the load 4.
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