| 摘要 |
PROBLEM TO BE SOLVED: To provide a transformer-less electric power converter for solar power generation, which does not fluctuate the potential of the direct current part of an inverter even in the case of a linkage to a three-phase three-wire system V-phase grounding system. SOLUTION: An inverter circuit is provided which has two pairs of series circuits Q1, Q2, Q3, Q4 of two switching elements in it. A plurality of capacitors C1, C2 dividing DC voltage are series-connected between the DC input parts of the inverter circuit. One output line OL2 is drawn, as one of the three-phase outputs, from the connecting parts C1, C2 of the capacitors. Respective two output lines OL1, OL3 are taken out, as other two of the three-phase outputs, from the intermediate points of the respective pairs of switching elements Q1, Q2, Q3, Q4, thereby forming a half-bridge inverter circuit. The output line OL2 drawn from the connecting part of the capacitors C1, C2 is connected with the grounded phase. |
