A 1OW class thin type D C D C converter is developed which uses a new type coreless wire transformer. The converter is intended for portable equipment use. The coupling factor of the wire transformer is more than 95% at frequencies higher than 1OOkHz. When applied in a 3 output DCDC converter, the converter is only 5 . 5 m thick and has 70% efficiency.

SUMMARYA direct methanol fuel cell (DMFC) is highly anticipated as a new, high-density energy source for mobile usage; however, its poor power density presents a problem. As a result, the size of portable electronic equipment using DMFCs is far larger than that of equipment using another type of battery. In addition, steady power supply control is difficult, because the output power of the DMFC is affected by the environment. First, this paper presents a pulse charge control system that is a new control system applied to a mobile device, which uses the DMFC and an electric double layer capacitor (EDLC), then describes the new passive heat control and presents experimental results.

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