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The wireless power transfer (WPT) system for electric vehicles requires high efficiency, lightweight, compact and be suited to big air gap. The WPT system has low coupling coefficient, which is far different from the traditional transformer. Optimal parameters design approach for resonant converter with S-S compensation for WPT is investigated. 85kHz and 20kHz parameters design are introduced in the...
An on-chip buck converter with 3D chip stacking is proposed and the operation is experimentally verified. The manufactured converter achieves a maximum power efficiency of 62% for an output current of 70mA with a switching frequency of 200MHz and a 2x2mm on-chip LC output filter in 0.35mum CMOS. The use of glass epoxy interposer to increase the maximum power efficiency up to 71.3%, and the power efficiency...
This paper describes the high-frequency characteristics of a multilayered planar transformer consisting of two planar coils and Co-Fe amorphous magnetic films. The parameters of transformer operation obtained by finite element method (FEM) calculations are compared with measured values. The analysis shows that characteristic evaluation is useful for a simple understanding of the operation of a transformer...
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