【摘要】：當前時期以電動汽車為主的新能源汽車受到了各國政府、汽車工業(yè)巨頭甚至是新銳科技公司的關注。電動汽車的關鍵技術問題包括電池系統(tǒng)、電機驅(qū)動系統(tǒng)和能量變換系統(tǒng)。而為鋰電池充電用的DC/DC變換器是電動汽車技術中的一個重要環(huán)節(jié)。研究應用于車載動力電池的DC/DC充電器,對于促進新能源汽車的發(fā)展和普及都有積極的意義。本項目主要對大功率DC-DC變換器進行研究與設計。變換器為滿足功率要求,并同時為滿足可靠性、高效率和低成本等要求,采用完全相同的雙路并聯(lián)移相全橋拓撲。在簡單分析了移相全橋變換器的基本工作原理的基礎上,進一步對雙路并聯(lián)移相全橋電路工作模態(tài)進行分析。此外針對超前臂和滯后臂的軟開關實現(xiàn)條件進行分析,給出了超前臂和滯后臂軟開關的實現(xiàn)條件。采用雙路并聯(lián)的拓撲,不可避免的問題是均流。雖然設計時,使兩個并聯(lián)電路完全一樣。但實際制作變換器時,不可能獲得特性一樣的兩個電路。針對均流問題,采用軟件程序來實現(xiàn)均流控制。在算法設計上,采用電流外環(huán)加電壓內(nèi)環(huán),配合最大電流均流法,實現(xiàn)兩路輸出電流均流的目的。在Matlab/simulink環(huán)境下,對該電路和控制方式進行了細致的仿真和分析。此外文章簡單闡述了全橋變換器的工程實現(xiàn)。并介紹基于TMS320F2812的數(shù)字化控制的設計實現(xiàn)。結合程序流程圖,詳細闡述了變換器的工作、控制過程。為了驗證電路的實際性能,對樣機進行了實驗測試。實驗表明,移相全橋DC/DC變換器雙閉環(huán)控制準確高效、較好的軟開關實現(xiàn)效果、雙路均流設計有效等,得到了預期的效果。
[Abstract]:At present, electric vehicles are the main new energy vehicles by governments, auto industry giants and even new technology companies. The key technical problems of electric vehicle include battery system, motor drive system and energy conversion system. The DC/DC converter for charging lithium battery is an important part of electric vehicle technology. The research on DC/DC charger used in vehicle power battery is of positive significance to promote the development and popularization of new energy vehicles. This project mainly studies and designs the high power DC-DC converter. In order to meet the power requirements, and to meet the requirements of reliability, high efficiency and low cost, the converter adopts exactly the same two-way parallel phase-shifted full-bridge topology. Based on the simple analysis of the basic working principle of the phase-shifted full-bridge converter, the working mode of the double parallel phase-shifted full-bridge circuit is further analyzed. In addition, the soft switching conditions of super forearm and lag arm are analyzed, and the realization conditions of super forearm and lag arm soft switch are given. Using two-way parallel topology, the inevitable problem is current sharing. Although the two parallel circuits are designed to be exactly the same. However, when the converter is actually made, it is impossible to obtain two circuits with the same characteristics. Aiming at the problem of current sharing, the software program is used to realize the current sharing control. In the algorithm design, the current outer loop plus voltage inner loop and the maximum current sharing method are used to realize the purpose of two output current sharing. In Matlab/simulink environment, the circuit and control mode are simulated and analyzed in detail. In addition, the engineering implementation of full-bridge converter is briefly described in this paper. The design and implementation of digital control based on TMS320F2812 are introduced. Combined with the program flow chart, the work and control process of the converter are described in detail. In order to verify the actual performance of the circuit, the prototype is tested. The experimental results show that the double closed-loop control of phase-shifted full-bridge DC/DC converter is accurate and efficient, the realization effect of soft-switching is good, and the double-channel current sharing design is effective, and the expected results are obtained.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM46;U469.72

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本文編號：2493391