用于电弧发射光谱的数字化自动引弧电路设计

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...

Design of Digital Automatic Arc Ignition Circuit for Arc Emission Spectrum

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.