| 摘要 |
PROBLEM TO BE SOLVED: To provide a standby power supply unit of which stability can be ensured, and of which the size and the weight can be reduced. SOLUTION: The standby power supply unit includes a filter reactor connected to a transmission line via a pantograph; a diode connected in series with the filter reactor; a contactor connected in series with the diode; a charging resistor connected in parallel to the contactor; a switching device connected in series with the contactor; two inverters connected in series with the switching device and switched by the switching device; a filter capacitor provided between the input and output terminals of the respective DC input side of the inverters; and a switching device, provided at the AC output side of the two inverters for switching the two inverters. COPYRIGHT: (C)2008,JPO&INPIT
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