Second order approximation lumped parameter model for planar integrated L-L-C-T module [power conversion]

Abstract

Planar integrated L-L-C-T (inductor-inductor-capacitor-transformer) technology has been the subject of intensive research over the last few years. Research of modeling and explaining its behavior in different power electronic circuits has been conducted. However, most of the previous models are based on first order approximation. High frequency characteristics of L-L-C-T cannot be modeled by those models. A second order approximation lumped parameter equivalent circuit of L-L-C-T is proposed in this paper. This model can describe the characteristics of L-L-C-T up to the third resonant frequency. The parameters of the model can be either extracted from small signal measurement or calculated from the L-L-C-T geometry structure. The proposed model is used to analyze the secondary voltage ringing of an asymmetrical half-bridge converter (AHBC) in distributed power system (DPS) applications. The predicted result matches the measurement result well.