基于DSP控制的新型LED路灯驱动器的研究与设计
发布时间：2019-05-17 04:59
【摘要】：LED路灯照明是一种高效、节能、环保、长寿命的照明光源,并在最近几年得到快速发展,逐渐成为照明市场的主导产品。LED路灯驱动器作为LED的供电系统,其性能是保证LED照明系统整体性能的关键,因此必须保证LED路灯驱动器具有高可靠性、高功率因数、长寿命、低成本等优点。传统的LED路灯驱动器中都含有电解电容,而电解电容的寿命比较短,只有几千小时,这成为了制约LED路灯及其驱动器寿命的主要原因。本文针对电解电容的使用而导致的LED路灯驱动器寿命较短这一问题,提出了一种基于DSP控制的新型LED路灯驱动器,去掉了寿命较短的电解电容,实现了控制部分的数字化,并对其进行了理论分析和设计。该驱动器由三级电路构成,包含4组独立的输出。第一级电路使用功率因数校正电路,可以获得较高的功率因素。由于这一级电路的输出端没有使用电解电容进行滤波,其输出电压纹波较大,将影响整个电路的性能,因此需要后级电路进行优化。第二级电路采用由DSP驱动的开环LLC谐振变换器,在降压的同时实现驱动器的电气隔离。第三级电路是4组由DSP控制的双输入Buck电路,减小了前两级电路带来的纹波并独立调整LED路灯驱动器的输出电流,为4路LED路灯提供稳定的电流。本文主要研究内容:(1)分析电解电容的寿命及其对电路的影响。(2)研究了功率因数校正电路及其控制方式,对功率因数校正电路进行理论分析及参数设计。(3)对开环LLC谐振变换器的工作原理进行了研究,完成了变压器及主要谐振网络参数的设计。(4)对双输入Buck电路的工作原理及效率进行了研究与分析,建立了其工作在电感电流连续模式下的小信号模型,完成了主要参数的设计。(5)新型LED路灯驱动器采用DSP芯片TMS320F2812作为控制核心以实现对LLC谐振电路和TIBUCK恒流电路的控制,给出了主程序及控制子程序的软件设计流程图。(6)利用MATLAB/SIMULINK建立新型LED路灯驱动器的仿真模型,并对仿真结果进行分析;在理论分析及仿真的基础上,搭建了一台基于DSP控制的新型LED路灯驱动器的样机进行实验论证。仿真和实验结果表明,本文提出的基于DSP控制的新型LED驱动器在去掉电解电容的情况下获得了较高的功率因素及较好的恒流效果。因此,该驱动器可用于大功率LED路灯。
[Abstract]:Led street lamp lighting is a kind of lighting light source with high efficiency, energy saving, environmental protection and long life, and has been developed rapidly in recent years, and has gradually become the leading product of lighting market. Led street lamp driver is used as the power supply system of LED. Its performance is the key to ensure the overall performance of LED lighting system, so it is necessary to ensure that LED street lamp driver has the advantages of high reliability, high power factor, long life, low cost and so on. The traditional LED street lamp drivers contain electrolytic capacitors, but the electrolytic capacitors have a short life of only a few thousand hours, which is the main reason that restricts the life of LED street lamps and their drivers. In order to solve the problem of short life of LED street lamp driver caused by the use of electrolytic capacitance, a new type of LED street lamp driver based on DSP control is proposed in this paper, which removes the electrolytic capacitance with short life and realizes the digitization of the control part. The theoretical analysis and design are carried out. The driver is composed of three-stage circuit and contains four sets of independent outputs. The first stage circuit can obtain higher power factor by using power factor correction circuit. Because the output terminal of this first stage circuit does not use electrolytic capacitor to filter, its output voltage ripples are large, which will affect the performance of the whole circuit, so it is necessary to optimize the later stage circuit. The second stage circuit adopts open-loop LLC resonant converter driven by DSP to realize the electrical isolation of the driver at the same time. The third stage circuit is four groups of dual-input Buck circuits controlled by DSP, which reduces the ripples caused by the first two circuits and adjusts the output current of LED street lamp driver independently, which provides a stable current for four LED street lamps. The main contents of this paper are as follows: (1) the life of electrolytic capacitor and its influence on the circuit are analyzed. (2) the power factor correction circuit and its control mode are studied. The power factor correction circuit is analyzed theoretically and the parameters are designed. (3) the working principle of open-loop LLC resonant converter is studied. The design of transformer and main resonant network parameters is completed. (4) the working principle and efficiency of double-input Buck circuit are studied and analyzed, and the small signal model working in inductor current continuous mode is established. The design of the main parameters is completed. (5) the new LED street lamp driver uses DSP chip TMS320F2812 as the control core to realize the control of LLC resonant circuit and TIBUCK constant current circuit. The software design flow chart of the main program and the control subroutine is given. (6) the simulation model of the new LED street lamp driver is established by using MATLAB/SIMULINK, and the simulation results are analyzed. On the basis of theoretical analysis and simulation, a prototype of a new type of LED street lamp driver based on DSP control is built for experimental demonstration. The simulation and experimental results show that the new LED driver based on DSP control has higher power factor and better constant current effect without electrolytic capacitance. Therefore, the driver can be used for high-power LED street lamps.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46;TM923.34
本文编号：2478819
[Abstract]:Led street lamp lighting is a kind of lighting light source with high efficiency, energy saving, environmental protection and long life, and has been developed rapidly in recent years, and has gradually become the leading product of lighting market. Led street lamp driver is used as the power supply system of LED. Its performance is the key to ensure the overall performance of LED lighting system, so it is necessary to ensure that LED street lamp driver has the advantages of high reliability, high power factor, long life, low cost and so on. The traditional LED street lamp drivers contain electrolytic capacitors, but the electrolytic capacitors have a short life of only a few thousand hours, which is the main reason that restricts the life of LED street lamps and their drivers. In order to solve the problem of short life of LED street lamp driver caused by the use of electrolytic capacitance, a new type of LED street lamp driver based on DSP control is proposed in this paper, which removes the electrolytic capacitance with short life and realizes the digitization of the control part. The theoretical analysis and design are carried out. The driver is composed of three-stage circuit and contains four sets of independent outputs. The first stage circuit can obtain higher power factor by using power factor correction circuit. Because the output terminal of this first stage circuit does not use electrolytic capacitor to filter, its output voltage ripples are large, which will affect the performance of the whole circuit, so it is necessary to optimize the later stage circuit. The second stage circuit adopts open-loop LLC resonant converter driven by DSP to realize the electrical isolation of the driver at the same time. The third stage circuit is four groups of dual-input Buck circuits controlled by DSP, which reduces the ripples caused by the first two circuits and adjusts the output current of LED street lamp driver independently, which provides a stable current for four LED street lamps. The main contents of this paper are as follows: (1) the life of electrolytic capacitor and its influence on the circuit are analyzed. (2) the power factor correction circuit and its control mode are studied. The power factor correction circuit is analyzed theoretically and the parameters are designed. (3) the working principle of open-loop LLC resonant converter is studied. The design of transformer and main resonant network parameters is completed. (4) the working principle and efficiency of double-input Buck circuit are studied and analyzed, and the small signal model working in inductor current continuous mode is established. The design of the main parameters is completed. (5) the new LED street lamp driver uses DSP chip TMS320F2812 as the control core to realize the control of LLC resonant circuit and TIBUCK constant current circuit. The software design flow chart of the main program and the control subroutine is given. (6) the simulation model of the new LED street lamp driver is established by using MATLAB/SIMULINK, and the simulation results are analyzed. On the basis of theoretical analysis and simulation, a prototype of a new type of LED street lamp driver based on DSP control is built for experimental demonstration. The simulation and experimental results show that the new LED driver based on DSP control has higher power factor and better constant current effect without electrolytic capacitance. Therefore, the driver can be used for high-power LED street lamps.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46;TM923.34
【参考文献】
相关期刊论文 前2条
1 孙凤艳;王友仁;崔江;林华;;功率变换电路电解电容器故障预测方法研究[J];电子测量与仪器学报;2010年01期
2 王冬青;;城市路灯照明节能的措施[J];科技信息(科学教研);2007年23期
相关硕士学位论文 前1条
1 贺玲;多路输出200W LED驱动电源设计[D];浙江大学;2010年
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