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

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

【摘要】：隨著我國(guó)可持續(xù)發(fā)展戰(zhàn)略的進(jìn)一步實(shí)施,數(shù)字礦山、感知礦山和礦山物聯(lián)網(wǎng)等技術(shù)得到了很大發(fā)展,這些技術(shù)的不斷進(jìn)步及應(yīng)用使得本質(zhì)安全型傳感設(shè)備、本質(zhì)安全控制裝置等井下自動(dòng)化監(jiān)控設(shè)備的需求逐年遞增,間接使得煤礦生產(chǎn)中對(duì)大功率本質(zhì)安全電源的需求不斷增加。EC電路是根據(jù)開關(guān)電源的電路概括得來(lái)的電路模型。由于開關(guān)電源在短路故障發(fā)生時(shí),電源電勢(shì)的存在對(duì)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(guān)電源的實(shí)際工作電路。通過(guò)對(duì)比大量基于IEC標(biāo)準(zhǔn)火花試驗(yàn)裝置的截止型EC電路火花放電的實(shí)驗(yàn)波形,對(duì)截止型EC電路短路火花放電過(guò)程的三個(gè)階段進(jìn)行了詳細(xì)分析,并建立了截止型EC電路基于IEC火花試驗(yàn)裝置的等效火花放電電路,之后結(jié)合等效電路的仿真波形,對(duì)截止型EC電路本質(zhì)安全的關(guān)鍵參數(shù)進(jìn)行分析。通過(guò)仿真得出:增大電源的內(nèi)阻和減小電源電勢(shì),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(dǎo)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(hù)形式是在火花放電過(guò)程中僅僅使截止時(shí)間內(nèi)的能量對(duì)外釋放,從而減少火花放電對(duì)外環(huán)境釋放的能量,提高設(shè)備安全性能。設(shè)計(jì)了以FPGA為主控芯片的短路保護(hù)電路,通過(guò)檢測(cè)實(shí)驗(yàn)電路的失電壓和過(guò)電流判斷短路故障的發(fā)生,并根據(jù)軟件程序設(shè)計(jì)驅(qū)動(dòng)MOSFET關(guān)斷從而切斷短路實(shí)驗(yàn)點(diǎn)。本課題設(shè)計(jì)的基于數(shù)字電路技術(shù)的截止保護(hù)硬件電路,與傳統(tǒng)的基于模擬電路技術(shù)的短路保護(hù)電路相比較,具有截止時(shí)間精度可達(dá)微秒級(jí)和截止時(shí)間大范圍可調(diào)等優(yōu)點(diǎn),確保了短路火花放電實(shí)驗(yàn)的可靠進(jìn)行。最后采用實(shí)驗(yàn)驗(yàn)證的方式,對(duì)截止型EC電路火花放電特性的研究結(jié)論進(jìn)行驗(yàn)證。本文關(guān)于截止型EC電路火花放電特性的結(jié)論,有助于豐富火花理論體系,并對(duì)大功率本質(zhì)安全電源的設(shè)計(jì)、制造和研究提供較為深入的理論指導(dǎo)和實(shí)用價(jià)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(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TD608

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本文編號(hào)：1345383