Study On Bidirectional DC/DC Converter In The Electric Vehicle

Electric Vehicle (EV) becomes a kind of new, fast-developing vehicle in the lastyears, which has the best future as a green vehicle, as the problems of energy andenvironment are becoming more and more serious in the 21st century. The energy inEV is provided by storage batteries instead of traditional gasoline, and thedevelopment of EV are limited by the capacity of its storage batteries with currenttechnologies. It can improve the performance of the storage batteries and the workingefficiency of driving systems by using bidirectional DC/DC converter in ElectricVehicle at present.The aim of this thesis is to do some research on the design of the bidirectionalDC/DC converter used in EV. The topologies of single directional DC/DC converterare analyzed at the first part of this thesis, and four topologies of non-isolatedbidirectional DC/DC converter are listed. Through detailed analysis and compare ofthese four topologies, the topology of the bidirectional Half-Bridge Converter isselected as the topology of bidirectional DC/DC converter. The working modes of thebidirectional Half-Bridge Converter are analyzed in detail at the second part of thisthesis. According to the design demands of the bidirectional DC/DC Converter, theparameters of the converter are computed. The simulation models of the converter areestablished using the software MATLAB/Simulink, and the results of the simulationtestify the analysis and computation. Then the implementation of the converter isintroduced. At the last part of this thesis, the main losses of the converter, the methodsof the analysis and computation of each kind of losses are analyzed in detail. At lastthe efficiency and the main factors impacting the efficiency are discussed.