Abstract
This paper presents the analysis of a rectifier load used for an electric vehicle (EV) wireless charging system, as well as its applications on compensation network design and system load estimation. First, a rectifier load model is established to get its equivalent input impedance, which contains both resistance and inductance components, and can be independently calculated through the parameters of the rectifier circuit. Then, a compensation network design method is proposed, based on the rectifier load analysis. Furthermore, a secondary side load estimation method and a primary side load estimation method are put forward, which adopt only measured voltages and consider the influence of the rectifier load. Finally, an EV wireless charging prototype is developed, and experimental results prove that the rectifier equivalent load can be correctly calculated on conditions of different system load resistances, rectifier input inductances, dc voltages, and mutual-inductances. The experiments also show that rectifier load equivalent inductance will impact system performances, and the proposed methods have good accuracy and robustness in the cases of system parameter variations.
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