Simulation Analysis of Contactless Energy Transfer System Based on Series Resonant Structure

Abstract

With the rapid development of wireless power transmission technology, wireless charging schemes based on magnetic resonance coupling are gradually becoming one of the mainstream application directions because of their high efficiency and structural flexibility. This paper focuses on the typical basic circuit of wireless charging, constructs a contactless energy transmission system based on a series resonance structure, and completes the modeling and simulation analysis on the Multisim platform. The circuit design includes a high-frequency excitation source, a coupling transformer, a primary and secondary resonant network, a rectifier filter and a load module. It has the characteristics of compact structure and clear parameters. By simulating and measuring the voltage and current waveforms of key nodes in the system, the influence of capacitor matching, inductor setting, and coupling coefficient on output voltage stability and system efficiency is studied quantitatively. The results show that the system can achieve stable wireless power supply performance with small output fluctuation and high transmission efficiency when the parameters are properly configured. This study provides a theoretical basis and technical support for the design optimization of a complex wireless charging system.