用于电弧发射光谱的数字化自动引弧电路设计  

Design of Digital Automatic Arc Ignition Circuit for Arc Emission Spectrum

作　　者：张鑫峣 段发阶[1] 傅骁[1] 蒋佳佳[1] 陈斌 ZHANG Xin-yao;DUAN Fa-jie;FU Xiao;JIANG Jia-jia;CHEN Bin(State Key Laboratory of Precision Testing Technology and Instruments,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学精密测试技术及仪器国家重点实验室,天津300072

出　　处：《仪表技术与传感器》2022年第1期38-44,共7页Instrument Technique and Sensor

基　　金：国家重点研发计划项目(2020YFB2010800);国家自然科学基金项目(61905175,51775377,61971307);国家科技重大专项(2017-V-0009);霍英东教育基金会资助(171055);中国博士后科学基金(2020M680878);广东省重点研发计划项目(2020B0404030001);天津市科技计划项目(20YDTPJC01660);中国航发四川燃气涡轮研究院外委课题(GJCZ-2020-0040,GJCZ-2020-0041)。

摘　　要：转盘电极发射光谱分析技术在油液成分检测中有重要应用,研究表明,电弧光源的稳定性对光谱分析的结果有重要影响,传统的电弧发生器多使用火花放电器作为引弧电路的核心器件,在油液成分分析中引弧的稳定性和可靠性难以保证。文章提出了一种用于电弧光源激发的数字化自动引弧电路,建立了高频引弧电路拓扑结构模型,使用双路可控硅代替火花放电器,并使用基于FPGA和电流反馈的Buck电路自动调整输出电压,分析了电路参数和控制策略对输出波形的影响。对间隙长度2~6 mm、覆盖油液样品厚度0.2 mm的电弧结构进行了电击穿仿真,结果显示电路的输出电压能够随间隙变化自动调整,且在不同间隙长度和电极上有无油液样品覆盖的情况下均能实现可靠引弧。The technology of emission spectrum analysis of rotating disc electrode has important application in the detection of oil composition.The research shows that the stability of arc light source has an important influence on the results of spectrum analysis.Traditional arc generators usually use spark discharger as the core device of arc ignition circuit,the stability and reliability of arc ignition in oil component analysis are difficult to guarantee.This paper presented a digital automatic arc ignition circuit for arc source and established the topology model of the arc ignition circuit.Dual thyristor was used instead of spark discharger and the output voltage was adjusted automatically by using Buck circuit based on FPGA and current feedback.The influence of circuit parameters and control strategy on output waveform was analyzed.The electric breakdown simulation was carried out for the arc structure with the gap length of 2~6 mm and the oil sample thickness of 0.2 mm.The simulation results show that the output voltage of the arc ignition circuit can be adjusted with the gap change and the circuit can achieve reliable arc striking under different gap length and whether there is oil sample coverage on electrode.

关 键 词：电弧发射光谱 转盘电极 数字化控制 高频引弧 可控硅 有限元仿真 

分 类 号：TH744[机械工程—光学工程]