Activation Function Model for Wireless Power Transfer System With an LCC-S Compensated Network

Abstract

Wireless power transfer (WPT) based on power electronic devices is a nonlinear system, its large-signal model is the basis for studying the operating characteristics and stability analysis of the system. The key to modeling is how to find a unified model to represent the equivalent circuit model in all switching states in the system. In this paper, a modeling method based on sigmoid activation function is proposed to solve this problem, the switching process of the switch in the system is approximated by the activation function. An LCC-S compensated WPT system is chosen as an example and the large-signal model in continuous mode(CM) and discontinuous mode(DM) are determined, the sigmoid function model is subsequently validated through simulation and experimentation. Simulation and experimental results show the effectiveness and accuracy of the model.