Three-Phase Electrolytic-Capacitor-Less LCC-S WPT System With Wide Operation Range

In order to improve the integration and life time of ac voltage input wireless power transfer (WPT) system, a topology based on electrolytic-capacitor-less matrix converter with inductor-capacitor-capacitor-series (LCC-S) resonant network is proposed. The relationship between the conversion ratio of the output and input voltages and resonant parameters are analyzed. It reveals although the boost operation is achieved by the parameter design of LCC-S network, it makes the system sensitive to the parameter variations. In order to extend the voltage conversion range, the improved two-stage WPT system based on the single-stage one is proposed. The dual-side closed-loop control of the two-stage system without the wireless communication is further proposed. The corresponding small-signal model is built and the parameters of the closed-loop controllers are designed. The feasibility and practicability of the proposed system are verified by the experiments.