截止型EC电路火花放电特性研究

发布时间：2017-12-28 09:01

本文关键词：截止型EC电路火花放电特性研究　出处：《中国矿业大学》2016年硕士论文　论文类型：学位论文

【摘要】：随着我国可持续发展战略的进一步实施,数字矿山、感知矿山和矿山物联网等技术得到了很大发展,这些技术的不断进步及应用使得本质安全型传感设备、本质安全控制装置等井下自动化监控设备的需求逐年递增,间接使得煤矿生产中对大功率本质安全电源的需求不断增加。EC电路是根据开关电源的电路概括得来的电路模型。由于开关电源在短路故障发生时,电源电势的存在对于短路火花的能量释放是不可忽略的,因此,与前人研究的RC电路相比较,EC电路更为接近开关电源的实际工作电路。通过对比大量基于IEC标准火花试验装置的截止型EC电路火花放电的实验波形,对截止型EC电路短路火花放电过程的三个阶段进行了详细分析,并建立了截止型EC电路基于IEC火花试验装置的等效火花放电电路,之后结合等效电路的仿真波形,对截止型EC电路本质安全的关键参数进行分析。通过仿真得出:增大电源的内阻和减小电源电势,EC电路火花放电功率减小;减小滤波电容,EC电路放电火花功率减小,其中导致火花放电功率减小主要是由于起始放电阶段火花放电功率显著减小,稳定放电阶段EC电路火花放电功率基本不变;截止保护形式是在火花放电过程中仅仅使截止时间内的能量对外释放,从而减少火花放电对外环境释放的能量,提高设备安全性能。设计了以FPGA为主控芯片的短路保护电路,通过检测实验电路的失电压和过电流判断短路故障的发生,并根据软件程序设计驱动MOSFET关断从而切断短路实验点。本课题设计的基于数字电路技术的截止保护硬件电路,与传统的基于模拟电路技术的短路保护电路相比较,具有截止时间精度可达微秒级和截止时间大范围可调等优点,确保了短路火花放电实验的可靠进行。最后采用实验验证的方式,对截止型EC电路火花放电特性的研究结论进行验证。本文关于截止型EC电路火花放电特性的结论,有助于丰富火花理论体系,并对大功率本质安全电源的设计、制造和研究提供较为深入的理论指导和实用价值。
[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.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TD608

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