Parameter Optimization Design of Full-Bridge LLC Resonant Converter under Variable Load
LLC resonant converter has some limitations in soft switching characteristics.Aiming at the problem of unstable soft switching characteristics of LLC resonant converter under variable load conditions,the soft switching constraints are derived based on ZVS/ZCS boundary.A set of parameter optimization design method based on full-bridge LLC resonant converter under variable load is proposed to improve the stability and efficiency of the system.The scheme not only considers the parameter optimization of resonant inductor,capacitor and transformer,but also fully considers the influence of load change on soft switching behavior.The working principle of the full-bridge LLC resonant converter is introduced,and the voltage gain and the impedance characteristics of the resonant network are analyzed in detail.According to the above design scheme,a 500 W vehicle charger test prototype is built and tested under laboratory conditions.The results show that the maximum efficiency of the test prototype can reach 96.36％.
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