Voltage Doubling and Current Doubling Electric Vehicle Wireless Power Transmission System Based on Hybrid Compensation Network
摘要
A voltage doubling/current doubling wireless power transmission system based on hybrid compensation network is proposed for EVs with 400 V/800 V battery voltage level and anti-offset charging requirements. A dual-transmitter-dual-receiver structure is adopted, combining LCC-S and S-LCC networks to realize 800 V voltage doubling and 400 V current doubling modes by switching between input-parallel-output-series and input-parallel-output-parallel. Theoretical analysis shows that the hybrid compensation network utilizes the complementary characteristics to offset the influence of coupling coefficient (0.25 ~ 0.5) variation, and the constant voltage gain fluctuation is ≤ ± 5%, which significantly improves the anti-offset capability. Simulations and experiments verify that the voltage/current doubling mode outputs 800 V/400 V, which are load-independent; the dual full-bridge inverter and the three-arm rectifier bridge work together to achieve high efficiency transmission, and maintain stability during sudden load changes and coupling offsets, which provides a highly efficient and robust solution for wireless charging of EVs with multiple voltage ratings.