Patent ID: 7079406
Filing Date: 2006-07-18
Classification: H02J,H02M,Y02E,Y10S

Abstract:
1. A power converting apparatus having a non-insulated converter and a non-insulated inverter to convert direct current power inputted from a power supply to alternating current power, and to supply the alternating current power to a commercial power system which is grounded, said apparatus comprising: a detector that detects for a ground fault of the power supply; and a controller that controls potential to ground of various points on the power supply by varying an input voltage of the converter and/or an intermediate voltage between the converter and the inverter so that the potential to ground of each point on the power supply becomes a voltage for a detectable ground fault by said detector, while said detector detects for a ground fault, and when the ground fault is detected by said detector, records information related to the ground fault in a memory.