本文選題：電子束焊機(jī) + 高壓電源�。� 參考：《蘭州交通大學(xué)》2017年碩士論文

【摘要】：隨著世界制造行業(yè)的不斷發(fā)展,電子束焊接技術(shù)作為一種優(yōu)質(zhì)、清潔、高效率的焊接技術(shù),逐漸成為了一種優(yōu)勢技術(shù)被廣范應(yīng)用。電子束焊機(jī)設(shè)備的關(guān)鍵部件電子槍需要一套穩(wěn)定、可靠的高壓電源為其提供工作能源。因此高壓電源系統(tǒng)的性能的好壞對焊縫的質(zhì)量有著關(guān)鍵性的影響。本課題來源于甘肅省科技支撐計劃——《用于鋼軌焊接的電子束焊機(jī)電源系統(tǒng)的研制》。本文主要對電子束焊機(jī)高壓加速電源的原理進(jìn)行了介紹,通過對LLC諧振變換器的工作原理以及Buck變換器的工作原理的研究對具體參數(shù)進(jìn)行了設(shè)計,并闡述了以DSP為控制芯片的控制系統(tǒng)的硬件及軟件的設(shè)計。文中還介紹了高壓電源系統(tǒng)半實(shí)物仿真實(shí)驗(yàn)平臺的搭建,并利用實(shí)時仿真實(shí)驗(yàn)平臺對高壓電源系統(tǒng)進(jìn)行仿真實(shí)驗(yàn),提高設(shè)計效率。電子束焊機(jī)電源系統(tǒng)主要包括高壓加速電源、陰極燈絲加熱電源等部分。電子束焊機(jī)電源的主電路主要包括整流濾波電路、Buck電路、逆變電路、諧振變換電路、高頻變壓器以及倍壓整流器。高壓電源的控制部分以DSP芯片TMS320F2812為控制核心,采用PWM和PFM混合調(diào)制的方法,將高壓反饋信號通過分壓電路進(jìn)行隔離采樣,采樣來的電壓信號先通過DSP2812控制板上的A/D轉(zhuǎn)換模塊直接進(jìn)行模數(shù)轉(zhuǎn)換,再將采樣電壓與給定的電壓進(jìn)行比較運(yùn)算處理,根據(jù)計算出的偏差再經(jīng)PI算法算出相應(yīng)的PWM波的脈寬值,并把計算出來的結(jié)果送入比較單元產(chǎn)生適合的PWM波形輸出至高壓電源主電路,控制功率轉(zhuǎn)換器件IGBT的開通與關(guān)斷,實(shí)現(xiàn)閉環(huán)控制,進(jìn)而實(shí)現(xiàn)高壓加速電源的快速調(diào)節(jié)和穩(wěn)定控制。本文搭建的高壓電源系統(tǒng)半實(shí)物仿真實(shí)驗(yàn)平臺,使用硬件軟件結(jié)合的的方式來研究高壓電源系統(tǒng)。根據(jù)電子束焊機(jī)高壓電源系統(tǒng)電路各部件的主要參數(shù)、技術(shù)要求、功能及拓?fù)?搭建電子束焊機(jī)高壓電源系統(tǒng)半實(shí)物仿真分析平臺。通過仿真系統(tǒng)對主電路及主要參數(shù)的仿真,對電子束焊機(jī)高壓電源系統(tǒng)進(jìn)行研究。半實(shí)物仿真實(shí)驗(yàn)提高了樣機(jī)試制的效率,最后通過樣機(jī)實(shí)驗(yàn),基本達(dá)到了電子束焊機(jī)高壓電源系統(tǒng)預(yù)期的技術(shù)參數(shù),得到了一套穩(wěn)定可靠的電源系統(tǒng)樣機(jī),促進(jìn)了民族工業(yè)的進(jìn)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.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG43

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