| 摘要 |
PROBLEM TO BE SOLVED: To provide a connection box for photovoltaic power generation system which is capable of suppressing heat evolution or a power loss caused by a backflow prevention diode without impairing a backflow prevention operation and can be downsized further.SOLUTION: As a configuration of the connection box, a first electromagnetic relay disconnecting or connecting power transfer lines between each of a plurality of input terminals for inputting a DC current outputted for each of a plurality of solar cell groups and an output terminal to a power conditioner, opening/closing control means for controlling drive of the first electromagnetic relay, and a backflow prevention control circuit 10 including a backflow prevention diode D connected to each of a plurality of power transfer lines in series, a backflow prevention circuit 11 connected to the backflow prevention diode in parallel, a second electromagnetic relay R2 opening/closing the backflow prevention circuit, and backflow prevention control means (a current detection circuit 12, a discrimination circuit 15 and a second relay drive circuit 16) for controlling drive of the second electromagnetic relay based on a magnitude of a current flowing through the backflow prevention diode and the backflow prevention circuit are accommodated in a box body.SELECTED DRAWING: Figure 1 |
