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A 10 W class thin type DC/DC power converter is developed which uses a new type of coreless wire transformer. The power converter is intended for portable equipment use. The coupling factor of the wire transformer is more than 95% at frequencies higher than 100 kHz. When applied in a 3 output DC/DC power converter, the power converter is only 5.5 mm thick and has 70% efficiency.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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Onda et al. (2002) studied this question.
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