| 摘要 |
PROBLEM TO BE SOLVED: To continue the power supply to AC load stably by switching the output circuit of an optional inverter device from a vehicle motor to AC load, out of a plurality of inverters for a vehicle at the tie of fault of an inverter device for power supply to AC load. SOLUTION: If fault occurs in a CVCF inverter 10c, each changeover switch is switched interlockedly, and changeover switches 15a, 15c, 16a, and 16c are opened, and changeover switches 15b and 16b are closed. On the other hand, a VVVF inverter 10b is changed over to the i/o circuit of the CVCF inverter 10c at the time of i/o circuit being sound by opening the changeover switches 15a, 16a and closing the switches 15b, 16b. Therefore, the VVVF inverter 10b converts the voltage of a DC power source 1 inputted through a DC high-speed breaker 2b, a DC reactor 4c, and a changeover switch 15b into AC, and supplies it to AC load 12 through the changeover switch 16b and an inverter transformer 11. |
