基于DSP的移相全桥车用锂电池变换器的研究
发布时间：2019-06-05 08:36
【摘要】：当前时期以电动汽车为主的新能源汽车受到了各国政府、汽车工业巨头甚至是新锐科技公司的关注。电动汽车的关键技术问题包括电池系统、电机驱动系统和能量变换系统。而为锂电池充电用的DC/DC变换器是电动汽车技术中的一个重要环节。研究应用于车载动力电池的DC/DC充电器,对于促进新能源汽车的发展和普及都有积极的意义。本项目主要对大功率DC-DC变换器进行研究与设计。变换器为满足功率要求,并同时为满足可靠性、高效率和低成本等要求,采用完全相同的双路并联移相全桥拓扑。在简单分析了移相全桥变换器的基本工作原理的基础上,进一步对双路并联移相全桥电路工作模态进行分析。此外针对超前臂和滞后臂的软开关实现条件进行分析,给出了超前臂和滞后臂软开关的实现条件。采用双路并联的拓扑,不可避免的问题是均流。虽然设计时,使两个并联电路完全一样。但实际制作变换器时,不可能获得特性一样的两个电路。针对均流问题,采用软件程序来实现均流控制。在算法设计上,采用电流外环加电压内环,配合最大电流均流法,实现两路输出电流均流的目的。在Matlab/simulink环境下,对该电路和控制方式进行了细致的仿真和分析。此外文章简单阐述了全桥变换器的工程实现。并介绍基于TMS320F2812的数字化控制的设计实现。结合程序流程图,详细阐述了变换器的工作、控制过程。为了验证电路的实际性能,对样机进行了实验测试。实验表明,移相全桥DC/DC变换器双闭环控制准确高效、较好的软开关实现效果、双路均流设计有效等,得到了预期的效果。
[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.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46;U469.72
[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.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46;U469.72
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