| 摘要 |
PURPOSE:To maintain high efficiency at all times without being influenced environmental conditions, a secular change of a solar cell, etc., by automatically tracking the maximum output point of a solar cell in each circuit block according to the difference between the output currents of plural electric power converting means. CONSTITUTION:A storage battery BT is charged with the current composed of currents passed through minute resistances RR and RL after electric power conversion by electric power converting means CR and CL from left and right divided solar cells PR and PL. At this time, voltages generated with the currents which flow to the storage battery and are generated by the solar cells PR and PL are developed across the minute resistance RR and RL. When different values are commanded as operation points of the solar cells, a comparator CP detects a difference in efficiency between both the solar cells and detects which of the solar cells supplies a larger current to the storage battery BT. Then the working voltages of the solar cells are varied thorugh the electric power converting means CR and CL with the signal of a control circuit CC on the basis of the output voltage of the comparator CP. Consequently, the maximum output points of the solar cells are found to enable the automatic tracking. |
