Performance analysis of megahertz-band transformer taking account of displacement current

In designing power electronics devices, it is very important to have accurate waveforms of input/output voltage and current in order to estimate the efficiency and the power factor. Therefore, it is useful to study the effective dynamic analysis method through a numerical approach. In these computations, the displacement current is ignored because the frequency range is lower than the megahertz range, and the necessity of taking into account the displacement current is thought to be uncertain when the transformer is operated at a frequency exceeding I MHz. This paper describes the effect of the displacement current on dynamic performances of a megahertz-band transformer. It is found that the influence of displacement current on output power is about 2% based on the results of computation, and becomes stronger as the frequency increases. The validity of the computation is verified through a comparison with the measured results. (c) 2007 Wiley Periodicals, Inc.