The Electric Vehicle Dc Charging Power Supply Design Based On Phase-shift Full Bridge ZVS Converter

Switching Power Supply is growing rapidly instead of Linear Power supply withthe development of power electronics technology, with advantages of high frequency,high efficiency, high power density and small size. Soft switching technology hasbecome the focus in the power electronic technology in recent years for it can reducethe electromagnetic interference. In all kinds of soft switch power supply circuit,Phase-Shifted Full-Bridge(PS-FB)-ZVS converter is widely used in high power fieldwith its both two bridge arms working under the condition of zero voltage softswitching(ZVS), low switch loss, simple structure, easiness to control, and noincreasing to the voltage stress of switch tube. In this thesis, the electric car chargeron the ground is researched based on Phase-Shifted Full-bridge (PS-FB)-ZVSconverter and DSP digital control.This thesis firstly made comparative analysis to electric vehicle charging methodand the commonly used DC-DC charging power supply, the charging method andthe power circuit topology is chosen, and the charging power supply system structureis shown in this thesis.Secondly the working principle of the power circuit topology ofFull-Bridge-ZVS converter used in this thesis is introduced, the defects such asinherent duty cycle loss and the parasitic oscillation on the output rectifier diodes isdiscussed. Solutions are discussed, and of which parameter design of maincomponents are presented on the basis.Then, the phase-shift full bridge ZVS converter modeling based on the smallsignal model of Buck converter is established obtained that the open loop function ofthe control system, and the bode plot through the simulation is observed. The controlcircuit based on DSP TMS320F28335including detection circuit、driver circuit、auxiliary power supply circuit、and protection circuit are designed, and the relatedparameters are calculated.Finally the design system circuit in the Matlab/Simulink, and related experimentis carried out. The Experiment Result Indicates: that charging system parameterdesign is reasonable, ZVS can be achieved successfully, which can meet therequirements of system performance. Digital control software can be working properly, protection circuit can test the fault timely and accurately with signalprotection, the output voltage is stabilized. All of them above verify the accuracy andthe reliability of the system design.