本文選題：X光機(jī) + 控制系統(tǒng)��； 參考：《沈陽師范大學(xué)》2017年碩士論文

【摘要】：隨著X射線在醫(yī)療、工業(yè)檢測、食品安全、安檢、生物、考古等領(lǐng)域的廣泛應(yīng)用,促使X光機(jī)取得了長足發(fā)展。傳統(tǒng)的X光機(jī)多采用工頻技術(shù),具有體積大、重量沉、操作不方便以及控制系統(tǒng)主體功能單一、速度慢、性能低、穩(wěn)定性差、集成度低等缺點(diǎn),已逐漸被市場所淘汰。隨著高壓開關(guān)電源、高頻燈絲電源技術(shù)的發(fā)展與引入,X光機(jī)由傳統(tǒng)的工頻提升到高頻,加之DSP、ARM、FPGA、單片機(jī)及計(jì)算機(jī)技術(shù)的發(fā)展與應(yīng)用,使X光機(jī)的發(fā)展趨勢更加趨于高頻化、智能化、體積小型化、數(shù)字化。本文針對傳統(tǒng)X光機(jī)存在的缺點(diǎn),對原有X光機(jī)的控制系統(tǒng)進(jìn)行分析研究,設(shè)計(jì)了一種基于DSP的X光機(jī)智能控制系統(tǒng)。本研究分析并設(shè)計(jì)了高壓發(fā)生電路、燈絲電源電路,并將新型高壓開關(guān)電源和高頻燈絲電源技術(shù)應(yīng)用到以TMS320F28335DSP為控制系統(tǒng)核心的控制電路中,實(shí)現(xiàn)整套系統(tǒng)的集成數(shù)字化控制。本研究構(gòu)建了雙路DA輸出、雙路AD轉(zhuǎn)換、實(shí)時(shí)控制及報(bào)警信息反饋、數(shù)字PID調(diào)節(jié)的閉環(huán)控制電路。并對DSP控制系統(tǒng)的軟硬件進(jìn)行設(shè)計(jì),其中硬件設(shè)計(jì)主要包括DSP芯片電源、復(fù)位、時(shí)鐘振蕩、JTAG、DA及AD轉(zhuǎn)換、外擴(kuò)矩陣鍵盤等電路。為了保證X射線的穩(wěn)定輸出,本研究設(shè)計(jì)了以HCNR200作為隔離器件,加之性能較高的CA3130A運(yùn)算放大器組成電壓采樣電路;設(shè)計(jì)了以HCNR200為隔離器,加之運(yùn)算放大器HA17324組成的電流采樣電路。軟件設(shè)計(jì)主要包括初始化、燈絲預(yù)熱、燈絲PID、高壓PID、雙路DA輸出、雙路AD轉(zhuǎn)換、保護(hù)等程序。最后對所研究設(shè)計(jì)的控制系統(tǒng)進(jìn)行測驗(yàn)和調(diào)試。經(jīng)多次測驗(yàn)與調(diào)試,其結(jié)果表明,本研究設(shè)計(jì)的控制系統(tǒng)能夠達(dá)到預(yù)期功能及所要求的技術(shù)指標(biāo)。該智能控制系統(tǒng)采用DSP控制,實(shí)現(xiàn)了集成數(shù)字化,具有外圍電路簡單、操作簡便、工作穩(wěn)定、精度高、軟件開發(fā)周期短、設(shè)計(jì)靈活等優(yōu)點(diǎn),具有良好的應(yīng)用價(jià)值。
[Abstract]:With the wide application of X-ray in medical treatment, industrial detection, food safety, safety inspection, biology, archaeology and other fields, X-ray machine has made great progress.The traditional X-ray machine adopts the power frequency technology, which has the disadvantages of large volume, heavy weight, inconvenient operation, single main function of the control system, slow speed, low performance, poor stability, low integration and so on, and has been gradually eliminated by the market.With the development and application of high voltage switching power supply, the introduction of high frequency filament power supply technology from traditional power frequency to high frequency, coupled with the development and application of DSP ARM FPGA, single chip microcomputer and computer technology, the development trend of X-ray machine tends to be more high frequency.Intelligent, miniaturized and digitized.Aiming at the shortcomings of the traditional X-ray machine, this paper analyzes and studies the control system of the original X-ray machine, and designs an intelligent control system of the X-ray machine based on DSP.In this paper, the high voltage generating circuit and filament power supply circuit are analyzed and designed, and the new high voltage switching power supply and high frequency filament power supply technology are applied to the control circuit with TMS320F28335DSP as the core of the control system to realize the integrated digital control of the whole system.In this paper, a closed loop control circuit with double DA output, double AD conversion, real-time control and alarm information feedback, and digital PID regulation is constructed.The hardware and software of DSP control system are designed. The hardware design mainly includes DSP chip power supply, reset, clock oscillation JTAGDA and AD conversion, extraneous matrix keyboard and so on.In order to ensure the stable output of X-ray, this paper designs a voltage sampling circuit using HCNR200 as isolation device and CA3130A operational amplifier with high performance, and uses HCNR200 as isolator.In addition, the current sampling circuit composed of operational amplifier HA17324.Software design mainly includes initialization, filament preheating, filament PID, high voltage PID, double DA output, double AD conversion, protection and other programs.Finally, the control system is tested and debugged.After many tests and tests, the results show that the control system designed in this paper can achieve the expected function and the required technical specifications.The intelligent control system adopts DSP control, realizes the integration digitization, has the peripheral circuit simple, the operation simple, the work stable, the precision is high, the software development cycle is short, the design is flexible and so on, has the good application value.
【學(xué)位授予單位】：沈陽師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TP273;O434.1

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本文編號(hào)：1750961