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  本文選題：X射線機 + 高頻高壓�。� 參考：《重慶理工大學》2012年碩士論文

【摘要】：由于X射線具有穿透物質(zhì)不被折射和反射，不受電場、磁場的影響，并且按直線傳輸和一定規(guī)律衰減的特性，已廣泛地應用在醫(yī)療衛(wèi)生、工業(yè)生產(chǎn)、科學研究、武器研制、國防建設(shè)、航天工程，各大火車站，機場安檢等各領(lǐng)域。醫(yī)用X射線機在臨床上應用越來越普及，并成為影像診斷各治療的主要醫(yī)療器械設(shè)備。 高頻高壓數(shù)字式X射線機是現(xiàn)代X光機的發(fā)展方向，X射線機工作電源頻率和管電壓(KV值)的提高，將帶來病人皮膚劑量降低、成像質(zhì)量提高、易進行實時控制、可減小高壓變壓器體積和重量,可實現(xiàn)超短時曝光等優(yōu)點。另一方面，高頻技術(shù)與計算機技術(shù)相結(jié)合，使X射線機在控制、監(jiān)測顯示、故障報警、自動處理等方面實現(xiàn)了智能化管理。 本論文主要針對醫(yī)用高頻高壓大功率X射線發(fā)生器系統(tǒng)的拓撲結(jié)構(gòu)，技術(shù)性能，電路原理進行系統(tǒng)詳細的設(shè)計和論述；并應用TI公司推出的最新的，應用于DC/AC，DC/DC的電路的開關(guān)電源的移相諧振PWM全橋控制芯片UCC3895。論文主要對X射線機發(fā)生器的三大核心功能板（包括：X射線管高壓發(fā)生器電源產(chǎn)生板，保護電路板，X射線管燈絲電流板）進行了詳細的設(shè)計分析，并對其PCB板進行數(shù)據(jù)，信號的測試，實驗結(jié)果基本達到預期目標。其中對軟開關(guān)技術(shù)ZVZCS在移相全橋電路中的應用作了具體的分析。 開關(guān)電源的高頻化是電源技術(shù)發(fā)展的創(chuàng)新技術(shù)，高頻化帶來的效益是使開關(guān)電源裝置空前地小型化，并使開關(guān)電源進入了更廣泛的領(lǐng)域，特別在高新技術(shù)領(lǐng)域的應用，推動了高新技術(shù)產(chǎn)品的小型化，，輕便化。移相全橋軟開關(guān)脈寬調(diào)制（PWM）技術(shù)，功率MOSFET管頻率的提高，有源功率因子校正技術(shù)（APFC）的開發(fā)，提高了AC/DC開關(guān)電源的功率因數(shù)，既治理了電網(wǎng)的諧波污染，又使電源的密度和效率得到很大提升。
[Abstract]:Because X-ray has the characteristics of not refraction and reflection of penetrating matter, no influence of electric field and magnetic field, and it is transmitted in a straight line and attenuates according to certain laws, it has been widely used in medical and health, industrial production, scientific research, and weapon development. National defense construction, space engineering, major railway stations, airport security inspection and other fields. Medical X-ray machines are becoming more and more popular in clinical application and become the main medical devices for imaging diagnosis and treatment. High frequency and high voltage digital X-ray machine is the developing direction of modern X ray machine. The increase of power supply frequency and tube voltage (KV value) of X-ray machine will lead to the decrease of skin dose, the improvement of imaging quality, and the easy real-time control. It can reduce the volume and weight of high voltage transformer and realize the advantages of ultrashort exposure. On the other hand, the combination of high frequency technology and computer technology makes the X-ray machine realize intelligent management in the aspects of control, monitoring and display, fault alarm, automatic processing and so on. In this paper, the topological structure, technical performance and circuit principle of medical high frequency and high power X-ray generator system are designed and discussed in detail. Phase shift resonant PWM full bridge control chip UCC3895 used in DC / AC DC / DC circuit. In this paper, the three core function boards of the X-ray generator are designed and analyzed in detail, including the power generation board for the high voltage generator of the X ray tube and the current board for the protection of the X ray tube filament, and the PCB data are carried out. Signal testing, the experimental results basically reach the desired goal. The application of soft switching technology ZVZCS in phase-shifting full bridge circuit is analyzed. The high-frequency switching power supply is an innovative technology in the development of power supply technology. The benefits of the high-frequency switching power supply are to make the switching power supply device more compact than ever, and to make the switching power supply enter a wider range of fields, especially in the field of high and new technology. It promotes the miniaturization and portability of high-tech products. Phase-shifted full-bridge soft-switching pulse width modulation (PWM) technology, the improvement of power MOSFET frequency and the development of active power factor correction (APFC) technology have improved the power factor of AC / DC switching power supply, which has eliminated the harmonic pollution of power grid. In addition, the density and efficiency of the power supply are greatly improved.
【學位授予單位】：重慶理工大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：R318.6;TM46

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本文編號：2105891