Research And Implementation Of3.5kW Electric Vehicle Charger

With the development of economy, the number of motor vehicles is increasingquickly; however, the energy and the environment problems stand out and become moreand more serious as well. One of the efficient solutions to the above problems isdeveloping electric vehicle (EV), which is one kind of new energy vehicle. The electricvehicle charger is the central charging equipment of an EV, which directly related to theresource of energy. Research and designing a nice electric vehicle charger which can notonly improve its performance and life, enhance its safety, but also save more energy andcut down solutions possesses important practical significance on popularize EV.As the power electronic equipment, electric vehicle charger is becoming smaller,lighter, and more digital, and EV’s directly linking to electric network puts forwardmore strict requirements on power factor, input current harmonics, efficiency, andoutput voltage ripple. Therefore, it is quite important to choose an appropriate topology.On the basis of analyzing several existing topologies and their control modes, thedissertation finally designed a3.5kW electric vehicle charger, the first stage of whichadopts to the Boost topology with single-cycle control to satisfy the requirement ofinput current harmonics and the power factor, and the second stage of which, namelyDC-DC, adopts to the HB-LLC resonance converter with partly digital control to satisfythe requirement of the efficiency and output voltage ripple.First, the dissertation analyzes principles of the first-stage PFC and second-stageDC/DC converter, puts forward designing methods of the circuits’ parameters, selectsproper elements, and designs the controllers of first and second stages. Then, simulationsoftware is used to simulate the converters and controllers to verify the correctness ofthe theory. Finally, an experimental prototype is made and experimental result is gotten.From the result we can know that it is theoretically as well as practically feasible toadopt this designing of electric vehicle car charger. Converters can work well in allstates, and satisfy the requirements of power factor, input current harmonics, efficiency,and output voltage ripple.