基于DSP控制的电子束焊机高压电源系统的研究

发布时间：2018-06-04 00:33

本文选题：电子束焊机 + 高压电源　；参考：《兰州交通大学》2017年硕士论文

【摘要】：随着世界制造行业的不断发展,电子束焊接技术作为一种优质、清洁、高效率的焊接技术,逐渐成为了一种优势技术被广范应用。电子束焊机设备的关键部件电子枪需要一套稳定、可靠的高压电源为其提供工作能源。因此高压电源系统的性能的好坏对焊缝的质量有着关键性的影响。本课题来源于甘肃省科技支撑计划——《用于钢轨焊接的电子束焊机电源系统的研制》。本文主要对电子束焊机高压加速电源的原理进行了介绍,通过对LLC谐振变换器的工作原理以及Buck变换器的工作原理的研究对具体参数进行了设计,并阐述了以DSP为控制芯片的控制系统的硬件及软件的设计。文中还介绍了高压电源系统半实物仿真实验平台的搭建,并利用实时仿真实验平台对高压电源系统进行仿真实验,提高设计效率。电子束焊机电源系统主要包括高压加速电源、阴极灯丝加热电源等部分。电子束焊机电源的主电路主要包括整流滤波电路、Buck电路、逆变电路、谐振变换电路、高频变压器以及倍压整流器。高压电源的控制部分以DSP芯片TMS320F2812为控制核心,采用PWM和PFM混合调制的方法,将高压反馈信号通过分压电路进行隔离采样,采样来的电压信号先通过DSP2812控制板上的A/D转换模块直接进行模数转换,再将采样电压与给定的电压进行比较运算处理,根据计算出的偏差再经PI算法算出相应的PWM波的脉宽值,并把计算出来的结果送入比较单元产生适合的PWM波形输出至高压电源主电路,控制功率转换器件IGBT的开通与关断,实现闭环控制,进而实现高压加速电源的快速调节和稳定控制。本文搭建的高压电源系统半实物仿真实验平台,使用硬件软件结合的的方式来研究高压电源系统。根据电子束焊机高压电源系统电路各部件的主要参数、技术要求、功能及拓扑,搭建电子束焊机高压电源系统半实物仿真分析平台。通过仿真系统对主电路及主要参数的仿真,对电子束焊机高压电源系统进行研究。半实物仿真实验提高了样机试制的效率,最后通过样机实验,基本达到了电子束焊机高压电源系统预期的技术参数,得到了一套稳定可靠的电源系统样机,促进了民族工业的进步。
[Abstract]:With the development of manufacturing industry in the world, electron beam welding (EBW) technology, as a kind of high quality, clean and high efficiency welding technology, has been widely used. The key component of the electron beam welder is that the electron gun needs a stable and reliable high voltage power supply to provide it with working energy. Therefore, the performance of high voltage power supply system has a key effect on weld quality. This topic comes from Gansu province science and technology support plan-"Research and Development of Electron Beam Welding Power system for Rail Welding". In this paper, the principle of high voltage accelerator for electron beam welder is introduced. The working principle of LLC resonant converter and the working principle of Buck converter are studied. The hardware and software design of the control system based on DSP is described. This paper also introduces the construction of the hardware-in-the-loop simulation experimental platform for the high-voltage power supply system, and makes use of the real-time simulation experimental platform to simulate the high-voltage power supply system to improve the design efficiency. The power system of electron beam welding machine mainly includes high voltage accelerating power supply, cathode filament heating power supply and so on. The main circuit of electron beam welder power supply includes rectifier filter circuit, inverter circuit, resonant converter circuit, high frequency transformer and double voltage rectifier. In the control part of the high voltage power supply, the DSP chip TMS320F2812 is used as the control core, and the mixed modulation method of PWM and PFM is adopted. The high voltage feedback signal is isolated and sampled by the divider circuit. The sampled voltage signal is converted directly by the A / D conversion module on the DSP2812 control board, then the sampling voltage is compared with the given voltage, and the pulse width of the corresponding PWM wave is calculated by Pi algorithm according to the calculated deviation. And the calculated results are sent to the comparator unit to produce suitable PWM waveform output to the main circuit of the high voltage power supply. The switch on and off of the power converter IGBT is controlled, and the closed-loop control is realized. Then realize the fast adjustment and stable control of the high voltage accelerating power supply. The hardware-in-the-loop simulation experiment platform of high voltage power supply system is built in this paper. The hardware and software are used to study the high voltage power supply system. According to the main parameters, technical requirements, functions and topology of the high voltage power supply system of the electron beam welder, a hardware-in-the-loop simulation and analysis platform for the high voltage power supply system of the electron beam welding machine is built. The high voltage power supply system of electron beam welder is studied by simulating the main circuit and main parameters. The hardware-in-the-loop simulation experiment improves the efficiency of the prototype trial production. Finally, through the prototype experiment, the expected technical parameters of the high voltage power supply system of the electron beam welding machine are basically achieved, and a set of stable and reliable power system prototype is obtained. It has promoted the progress of national industry.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG43

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