A Linear Large-Signal Model for Inductive Power Transfer System

The promising advantages of inductive power transfer are harnessed through modeling techniques. In instances where a system undergoes substantial dynamics, a large-signal model becomes imperative. Nevertheless, existing models grapple with issues of complexity, nonlinearity, and a lack of physical meaning. This article is dedicated to scrutinizing the validity of techniques in small-signal modeling and delving into the inherent system characteristics to simplify the large-signal model. A comprehensive model is formulated to address both large- and small-signal scenarios for inverter and resonant tank. The rectifier model is subject to a detailed examination to demonstrate the simplification process. Ultimately, a concise, low-order linear large-signal model is constructed, taking into account both circuit and mathematical perspectives. Experimental validation is conducted to assess the system's response to substantial dynamics, with the resulting linear model successfully predicting the waveforms of both dc and ac state variables.