Based On No Bridge Staggered Parallel Resonance Technology And Car Charger

Eletric vehicle (EV) is attracting increasing attention because of its zero emission and low noise. It also has the potentiality of solving environmental pollution caused by traditional vehicle and problem of the decrease of oil resource. With the development of EV, the problems of battery and charging equipment should be resolved. As a charging equipments, On-board charger plays an important role in the EV system, especially in the aspect of battery protection. The purpose of this dissertation is to propose a high-perfomance on-board charger.As an charging equipment of EV and interface to power grid, on-board charger must have high performance on these aspects, such as power factor, harmonic current, effiencicy, EMI and so on. In order to achieve these strict requirements,there are some problems needed to be resolved, such as the recovery problem of APFC in the middle or high power level, and efficiency of the charger.Firstly, the dissertation puts forward the objectives of the on-board charger. Secondly, relying on the objectives of the charger and analysis of the mainstream topologies, such as totem bridgeless topology, interleaving topology, LLC resonant topology and so on, it concludes that the proper structure would be the two stage PFC, with bridgeless interleaving boost converter for the first stage, and full bridge LLC resonant converter for the secondary stage. Thirdly, the dissertation analyzes the working process and control strategy, and designs the parameters of power circuit and control system. Finally, the dissertation uses simulation tools to further testify the proposed circuit, computed parameters and control system.According to simulation results, the proposed topology for on-board charger, basing on the bridgeless rectifier, interleaving boost and LLC reasonant converter, has high performance on the PF, current harmonics, effiency and EMI. The main circuit and its control system work properly. Therefore, the proposed on-board charger is correct, the method and the design are appropriate.