Enhancing multi-resonant MCR WPT systems: A novel multi-frequency transmission approach with unipolar PWM and QEP-based analysis

Abstract This paper introduces a multi-frequency resonant wireless energy transmission system employing a single-transmit multi-receive magnetic coupling structure, effectively overcoming the limitations of traditional single-frequency systems. Implementing a multi-frequency pulse width modulation strategy optimizes the energy transmission across multiple magnetically coupled resonant frequencies, significantly enhancing system adaptability and device compatibility. Additionally, the paper utilizes the Quadratic Eigenvalue Problem (QEP) as an analytical tool, strengthening the theoretical foundation for system design and optimization. Experimental validation confirms the technical feasibility of the proposed method, paving a new path for the development of wireless energy transmission technology.