Design Of PFC AC/DC Converter For Battery Chargers In Electrical Vehicle

As the representative of the new energy vehicles, electric vehicles’ development has become an important measure to solve the contradiction between energy and the environment. As an important new energy automotive products, electric vehicles’charging technology has been widely studied concern, considering the PFC AC/DC converter for car charger has a direct impact on the life and charging efficiency of the battery pack, the dissertation focuses on the design of the PFC AC/DC converter for car charger.Firstly, the dissertation explained the development status and trends of the PFC AC/DC converter for car charger, details of the power factor correction definition, classification, topology and control strategy, comparative analysis the advantages and disadvantages of the basic topologies and control strategies, Laid the theoretical foundation for the PFC AC/DC converter’s research.Aiming at the battery charger of rated power 2kW and battery charger’s design requirements, details the design of main circuit and control circuit in PFC AC/DC converter, describes the major components on the basis of parameters and device selection, build a simulation model of PFC AC/ DC converter and simulation analysis by saber software.And completed PCB layout, circuit board soldering and experimental validation tests on the basis of the simulation test of PFC AC/DC converter, confirmed the validity of car charger’design of the rated power 2k W.In view of the the dynamic response is slow and output voltage’ secondary ripple is large’s technical deficiencies of classic double-loop control of PFC AC/DC converter, the paper studies the nonlinear power control based on the theory of differential flat of PFC AC/DC converter, completed the modeling of PFC AC/DC converter and simulation comparative analysis about the classic double-loop control and power control based on differential flatness of PFC AC/DC converter, aimed at overcoming the technical deficiencies of classic double-loop control of PFC AC/ DC converter, enhance the dynamic response speed and reduce output voltage’secondary ripple of PFC AC/DC converter of car charger.