Recently, the solar cell has been used as power sources for the radio relay stations, the light houses, the agricultural systems, the microwave communication systems, and so forth. In such solar call power supply systems, it often requires that the maximum power point of the solar array is tracked, in spite of the variations in the load and the light intensity, to make the most efficient use of the solar array and the storage battery. The purpose of this paper is to propose a new solar cell power supply system, in which the bidirectional DC-DC converter and the simple control circuit with a small monitor solar cell are used to track the maximum power point of the solar array. It is clarified experimentally that the new system can realize high power conversion efficiency and precise maximum power tracking performance.
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