A capacity leakage of a capacitor (18, 19) in a power conditioner (3) of a photovoltaic power system is detected to continue or stop running of the system according to a degree of the capacity leakage. A method according to an embodiment of the invention f...

This invention enhances the maintenance when the individual electronic component fails and realizes low cost maintenance. When raising the DC power supplied from a solar cell or a fuel cell by means of a DC/DC converter circuit (30) and converting to the A...

This invention enables a power conditioner of a photovoltaic system to operate at higher accuracy. A chopper circuit (5), a capacitor (18) connected in parallel to the chopper circuit, and a control circuit (9) for controlling ON/OFF of switch elements (10...

A sensor for detecting a specific object (such as a hand) excellent in operation reliability and response, further excellent in mountability (dominance such as in size and design) on a vehicle, and much less in power consumption than conventional impulse r...