To downsize the constitution of a device at large by contriving the method of charging an electric double layer capacitor before its initial start thereby reducing the capacitor of a chopper.
In a condition that a breaker 8 is opened and a switch 9 is opened, a switch 12 is switched on to charge a DC capacitor 7 by means of a precharge circuit 11. Then, the breaker 8 is switched on and the switch 12 is opened, and a capacitor 10 is charged by a chopper 13 while controlling the DC voltage of the power converter 6 to be constant. Then, the chopper 13 is stopped and the switch 9 is switched on, and a capacitor 10 is charged with DC power that is obtained by operating the power converter 6 as a converter. Since the charge by the chopper 13 is only in the initial stage of the charge, the chopper 13 gets off with small capacity, and the device configuration is downsized.
NARA HIDETAKA
ONABE MINORU
KANEDA MINORU
SUGIMOTO SHIGEYUKI
HATANO RYOSUKE
CHUBU ELECTRIC POWER
Tadahiro Mitsuishi
Yasuyuki Tanaka
Hiroshi Matsumoto
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