| 摘要 |
<p>In the present invention, first boosting circuits (41 a to 41 d) are interposed upon each of direct current power lines (La to Ld). The boosting ratios of the first boosting circuits (41 a to 41 d), for each iteration of a first cycle, are variably controlled during a first period so that the generated power of the corresponding solar cell strings (1a to 1d) is maximized, and the boosting ratios during a second period are controlled so as to be maintained at a uniform value. The total amount of time of the first period and the second period is made to correspond to the first cycle.</p> |
