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Study on High-Frequency Inverter On-board Charging Power Supply for Electric Vehicle

Author: ZhangShuHao
Tutor: CaoBiao
School: South China University of Technology
Course: Mechanical and Electronic Engineering
Keywords: high-frequency inverter DSP electric vehicle charging power supply
CLC: U469.72
Type: Master's thesis
Year: 2011
Downloads: 147
Quote: 0
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Abstract


With the problem of global energy and environment being outstanding day by day, electric vehicle(EV) was developed because of the advantages in energy saving and emission reduction. EV charging power supply can provide effective energy supplies for EV’s continuous operation, and it is one of the key parts for EV development. Therefore, design and develop on-board charging power supply of electric vehicles which can well satisfy the demand of power batteries recharging have important significance for the industrialization and marketization of EV.The paper firstly determined the overall solution of the charging power supply, and the digital high-frequency inverter on-board charging power supply for EV was designed, which was based on DSP. The topological structure of main circuit consisted of the front Boost type PFC circuit and the full-bridge inverter. The design of power magnetic components of main circuit , the selection of main power components , the design of high-frequency driver circuit and main circuit PCB were completed. The signal control system based on the single chip DsPIC33FGS610 was designed, including signal detecting circuit、communication interface circuit、switching value input and output interface circuits、protection circuit, etc. The programs of the PWM, A/D sampling, PI control, LCD display, RS485 communication, etc were written and debugged.A simulation model of charging power supply was built using the MATLAB/Simulink, and the simulation result showed the feasibility of power control scheme. The current loop and voltage loop of digital PFC circuit were debugged, and the digital PFC control of the pre-stage of power supply inverter was realized. The results showed that the power factor correction can reduce the harmonic amount of input current and raise the power factor value remarkably.The experimental platform was built. The constant-current charging, pulse charging, pulse charge-discharge charging experiment were done to power supply respectively. Charging curves control was realized under the different pulse frequency and duty cycle. After the feasibility and the stability of the output of charging power supply were guaranteed, the preliminary charging experiment of three kinds charging mode were done to the lead-acid batteries(48V/12AH) separately. The results show that the effect of pulse charging mode and constant current charging mode were almost the same, and pulse charge-discharge charging mode improved the charging efficiency of lead-acid batteries in a certain extent.

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CLC: > Transportation > Road transport > Automotive Engineering > A variety of automotive > Various energy vehicles > Electric vehicles
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