Abstract
This paper describes loss reduction techniques for a transformer used in a multi-input converter which is powered by a commercial AC power source as well as by batteries. Although the converter circuit configuration is simple, converter loss is comparatively large when the unit is powered by battery and driven at high frequency. The reason for this comparatively large loss is that large distributed capacitance exists in the battery input winding of the multi-input transformer, and the capacitance is alternately charged and discharged through the switching element according to the on-off state of the switching transistor.One way of effectively reducing this distributed capacitance is to increase the space of each AC input layer. This can be done by incleasing the insulation distance for each layer. It is also shown that loss in a multi-input converter operating at 1 MHz is reduced by about 4 %.
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