基于级联H桥多电平逆变器的多频多负载无线功率传输系统

To address the issues of limited output power and harmonic interference in existing multifrequency and multiload magnetic coupling resonant wireless power transfer (MFML-MCR-WPT) systems, this article proposes a MFML-MCR-WPT system based on a cascaded H-bridge multilevel inverter (CHB-MLI). The system utilizes the phase disposition multifrequency modulation technique, achieving arbitrary frequency and quantity power output and control through the design of modulation wave quantity, frequency, and amplitude. First, the structure of the CHB-MLI-based MFML-MCR-WPT system is proposed, and the working principle of the multifrequency modulation method is analyzed. Subsequently, a five-level dual-frequency and dual-load system is taken as an example to establish the mathematical model. Then, system parameter optimization is conducted to suppress cross-coupling and interfrequency interference. Furthermore, to address the power and loss imbalance among H-bridge units under multifrequency low modulation indices, a carrier reconstruction method is adopted to balance power distribution and switching losses. Finally, an experimental platform is constructed to validate the proposed theory. Simulation and experimental results demonstrate that the system achieves multilevel multifrequency power output with continuous power and frequency control, maintains minimal interchannel interference, and achieves H-bridge unit balancing ratios of 1:1.19, while exhibiting excellent system compatibility and controllability.