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This paper introduces novel train-draft-cooling power converters developed by Central Japan Railway Company (JR Central) for the Shinkansen high-speed train. Due to the absence of blower motors, fans and liquid cooling mediums, the train-draft-cooling power converters for the Series N700, which made its commenced operation in July, 2007, realized a weight-reduction of about 220kg (10%) compared with conventional forced-ventilation-cooling power converters. This system will contribute to reductions in the greenhouse gases through disuse of cooling mediums and in energy consumption which accompanies the decrease in weight.