| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a transformerless grid connected inverter system which securely prevents leakage of DC current even if one pole of a DC power supply is grounded. <P>SOLUTION: The grid connected inverter system 1 is provided with a DC/DC converter circuit and an inverter circuit 6. The DC/DC converter circuit is constituted of a DC/DC converter circuit 3 of a boosting-type converter circuit, which is connected in parallel to the DC power supply 2 and outputs voltage higher than the negative pole b of the DC power supply 2, and a DC/DC converter circuit 4 of the boosting-type converter circuit, which outputs voltage lower than the negative pole b. In the inverter circuit 6, a pair of output terminals 6d and 6e are connected to a U phase and a W phase of a power system 8. A grounding terminal 6c is connected to a V phase connected to ground G of the power system 8 and terminals 3c and 4c connected to the negative pole b of the DC power supply 2 of the DC/DC converter circuits 3 and 4. <P>COPYRIGHT: (C)2011,JPO&INPIT |
