本文關鍵詞：截止型EC電路火花放電特性研究　出處：《中國礦業(yè)大學》2016年碩士論文　論文類型：學位論文

  更多相關文章： EC電路 數(shù)字電路截止保護 本質安全 火花放電特性

【摘要】：隨著我國可持續(xù)發(fā)展戰(zhàn)略的進一步實施,數(shù)字礦山、感知礦山和礦山物聯(lián)網(wǎng)等技術得到了很大發(fā)展,這些技術的不斷進步及應用使得本質安全型傳感設備、本質安全控制裝置等井下自動化監(jiān)控設備的需求逐年遞增,間接使得煤礦生產中對大功率本質安全電源的需求不斷增加。EC電路是根據(jù)開關電源的電路概括得來的電路模型。由于開關電源在短路故障發(fā)生時,電源電勢的存在對于短路火花的能量釋放是不可忽略的,因此,與前人研究的RC電路相比較,EC電路更為接近開關電源的實際工作電路。通過對比大量基于IEC標準火花試驗裝置的截止型EC電路火花放電的實驗波形,對截止型EC電路短路火花放電過程的三個階段進行了詳細分析,并建立了截止型EC電路基于IEC火花試驗裝置的等效火花放電電路,之后結合等效電路的仿真波形,對截止型EC電路本質安全的關鍵參數(shù)進行分析。通過仿真得出:增大電源的內阻和減小電源電勢,EC電路火花放電功率減小;減小濾波電容,EC電路放電火花功率減小,其中導致火花放電功率減小主要是由于起始放電階段火花放電功率顯著減小,穩(wěn)定放電階段EC電路火花放電功率基本不變;截止保護形式是在火花放電過程中僅僅使截止時間內的能量對外釋放,從而減少火花放電對外環(huán)境釋放的能量,提高設備安全性能。設計了以FPGA為主控芯片的短路保護電路,通過檢測實驗電路的失電壓和過電流判斷短路故障的發(fā)生,并根據(jù)軟件程序設計驅動MOSFET關斷從而切斷短路實驗點。本課題設計的基于數(shù)字電路技術的截止保護硬件電路,與傳統(tǒng)的基于模擬電路技術的短路保護電路相比較,具有截止時間精度可達微秒級和截止時間大范圍可調等優(yōu)點,確保了短路火花放電實驗的可靠進行。最后采用實驗驗證的方式,對截止型EC電路火花放電特性的研究結論進行驗證。本文關于截止型EC電路火花放電特性的結論,有助于豐富火花理論體系,并對大功率本質安全電源的設計、制造和研究提供較為深入的理論指導和實用價值。
[Abstract]:With the further implementation of the strategy of sustainable development in our country, the digital mine, mine and mine awareness of IOT technology has made great progress, progress and application of these techniques makes the intrinsically safe sensor equipment, intrinsically safe control device of underground automatic monitoring equipment demand is increasing year by year, thus increasing demand for high power nature the safety of the power production in coal mine. The EC circuit is a circuit model that is based on the circuit of the switching power supply. Because the switching power supply is short circuit fault, the existence of the power potential is not negligible for the energy release of short-circuit sparks. Therefore, compared with the previous RC circuits, the EC circuit is closer to the actual working circuit of the switching power supply. By comparing the experimental waveforms by EC circuit IEC spark discharge standard of spark test device based on three stage cut-off type EC circuit short circuit discharge process are analyzed, and the establishment of a cut-off type EC equivalent circuit spark discharge circuit IEC spark test device based on combination of simulation waveforms of equivalent circuit the analysis of the key parameters of the cut-off type EC circuit intrinsically safe. The simulation shows: increase the resistance of power supply and reduce power electric spark discharge circuit EC power reduction; reduce the filter capacitance, EC circuit spark discharge power decreases, which leads to the spark discharge power reduction is mainly due to the initial discharge stage of spark discharge power significantly reduced, stable discharge stage EC circuit spark discharge power cut-off protection form basically unchanged; is the only energy released by the deadline in the discharge process, thereby reducing the spark discharge energy released by the external environment, improve the safety performance of the equipment. A short-circuit protection circuit based on FPGA is designed. It detects the occurrence of short-circuit fault by detecting the voltage and overcurrent of the experimental circuit, and drives the MOSFET turn off according to the software programming, so as to cut off the short-circuit test point. The hardware circuit of digital circuit cut-off protection technology based on the design of the subject, and the traditional short-circuit protection circuit based on technology compared with the cut-off time precision can reach microsecond range and cut-off time adjustable etc, to ensure reliable short-circuit spark discharge experiment. Finally, the research results of the spark discharge characteristics of the cut-off EC circuit are verified by experimental verification. The conclusion of the spark discharge characteristics of cut-off EC circuits is helpful to enrich the spark theory system, and provide deeper theoretical guidance and practical value for the design, manufacture and research of high-power intrinsically safe power supply.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TD608

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