Design, Control and Experimental Validation of a Wireless Power Transfer Charger

A Pedagogical Approach

Abstract

This paper presents the systematic design and control of a wireless power transfer (WPT) charger, from early modeling to experimental validation. The study begins with a detailed analytical modeling of the resonant WPT system to analyze its electrical behavior and identify key parameters influencing efficiency and stability. Based on this analysis, the power stage—including the coils, compensation network, and inverter—is designed in accordance with the SAE J2954 standard to ensure compatibility with emerging electric vehicle charging requirements. Several control strategies are then developed and compared using MATLAB/Simulink, focusing on maintaining battery charging current and voltage regulation under variations in coupling and misalignments. The most effective control approach is implemented on a microcontroller and experimentally tested on a 500 W laboratory prototype. Measurements confirm stable operation, efficiency above 80 %, and robust performance against misalignment. The work provides a pedagogical yet realistic example of the complete design process for modern WPT systems, illustrating how modeling, control design, and hardware validation can be integrated to bridge theory and practical engineering education.