| 摘要 |
PROBLEM TO BE SOLVED: To lower the cost and make a solar battery in a different combination usable by controlling the output voltage of the solar battery to a constant voltage after an optimum operating voltage of the solar battery is set. SOLUTION: After a system is actuated, a control part 6 reads in the output voltage VIN of the solar battery 1 and the output voltage V2 N of a DC/DC converter 4 in each sampling cycle. In setting mode for the optimum operating voltage Vop, the input current to the DC/DC converter 4 is increased and the output voltage of the solar battery 1 when the output voltage indicates a maximum value is the optimum operating voltage Vop. An arithmetic part of the control part 6 compares the output voltage V2 N of the DC/DC converter 4 with the output voltage V2 B at last sampling time and sets the output voltage V1 B of the solar battery 1 corresponding to V2 B as the optimum operating voltage Vop when V2 N becomes less than V2 B. When V1 N > Vop, the output voltage of the solar battery 1 is reduced and when V1 N < Vop,. the output voltage of the solar battery 1 is increased. |
