A Systematic Approach to Estimate High-Frequency Transformer Parameters

Accurate modeling of the high-frequency transformer is essential in power electronic applications for better prediction of switching transient effects of fast-switching devices and common-mode modeling. A four-capacitor lumped model is considered in this paper. A method to determine the parameters of an HFT is proposed by performing various open- and short-circuit tests on a high-frequency transformer. For each test, frequency responses are obtained using an impedance analyzer, and analytical expressions are simultaneously derived. The high-frequency transformer parameters are identified through analytical equations and the experimentally obtained frequency responses. The proposed method is verified using LTSpice simulation and experiments for a high-frequency transformer with integrated leakage inductance.