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A Study on Vehicle Digital Power Supply for Lithium Battery Motor Vehicle

Author: LiuGeng
Tutor: CaiWenZuo
School: Xi'an University of Science and Technology
Course: Power Electronics and Power Drives
Keywords: Lithium battery electric vehicles Car charging power Digital PFC Bridge converter CPLD
CLC: U463.63
Type: Master's thesis
Year: 2010
Downloads: 279
Quote: 2
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Abstract


Today's world, the energy crisis , motor vehicle exhaust pollution, electric vehicles as a non-polluting means of transport , the market has a lot of advantages , including a lithium -powered electric vehicles have become a hot international competition . But the charging station and charging pile construction and popularity due to the cost of electric vehicles , charging stations operating costs and many other factors which will be restricted. Therefore, the vehicle charging power supply has profound practical significance and economic value. In this paper, rechargeable lithium battery -powered vehicle power were systematically studied and designed a power 3KW digital charging power . Digital power factor correction (PFC) technology and full-bridge converter circuit structure of the overall design. Traditional analog PFC control method for many shortcomings , presents digital PFC control technology, its anti-interference ability , high reliability , enabling sophisticated control advantages make digitally controlled analog control has been replaced by the trend . Car charging power supply design is divided into hardware and software design in two parts. Hardware design is divided into : the main circuit , the main control circuit , PWM driver circuit , sample conditioning circuits , communication circuits, and auxiliary power supply designs. Mainly in the main circuit differential mode and common mode chokes , PFC circuits, and full-bridge converter has been designed ; master control circuit, using Microchip's dsPIC30F6010 as the main control chip , combined with Xilinx's XC9500 series CPLD finished charging power control function ; PWM drive circuit using totem pole drive to strengthen its drive capability ; sampling conditioning circuit using a Hall voltage and current sensors to complete the main circuit of the parameters of the sampling, and to achieve a variety of protection functions ; communications circuits to the CAN bus way data communication with the host computer in order to achieve a battery management system (BMS); in the auxiliary power supply , the power supply to a group based on five sets of power supply designed to achieve the various parts of the power isolation. Software part of the design is divided into two parts: First PFC digitizing software design ; Second, full-bridge converter software control. Finally, the paper made ??a summary and pointed out the advantages and disadvantages of this design , to provide a reference for further study direction .

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