| 摘要 |
PROBLEM TO BE SOLVED: To provide an auxiliary power unit for AC electric train, which enables the supply of AC power even when the input from the tertiary winding of a main transformer goes off. SOLUTION: A power converter 33 is formed by connecting semiconductor switch elements 32a-32d in parallel with each arm of the rectifier of a DC auxiliary power circuit 22, and when a power failure detector 34 detects the power failure of AC inputted via the tertiary winding 15 of the main transformer 14 from a pantograph 12, a controller 35 switches on or switches off the semiconductor switches 32a-32d of the power converter 33 thereby performing inverter operation, and discharges power to a middle DC link section 20 from a battery 23, and continues the operation of the first inverter 24 of an AC auxiliary power circuit 21 and supplies AC power to the AC auxiliary power circuit 21. COPYRIGHT: (C)2009,JPO&INPIT
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