基于FPGA的快速PCB微電阻測量儀的設(shè)計
發(fā)布時間：2018-12-27 12:30
【摘要】：針對PCB飛針檢測的實際需要,以及檢測PCB微小缺陷造成的阻值變化,需要設(shè)計高精度的快速微阻測量儀,本文詳細論述了現(xiàn)有飛針測試機的工作流程,以及制約其速度的關(guān)鍵因素,并且針對這些因素設(shè)計了一種全新的飛針測試機系統(tǒng)架構(gòu),在實際應(yīng)用中驗證了其可行性。為了從低信噪比的信號中將有用信號提取出來,分別從理論上分析并仿真了模擬電路及數(shù)字信號處理這兩種方法的可行性。這兩種方法的基礎(chǔ)都是基于對噪聲來源及特性的分析,本設(shè)計也重點分析了噪聲和干擾的來源。同時在本論文中詳細分析了微阻測量中的噪聲,誤差來源以及微弱信號的檢測方法,提出了一種快速的基于FPGA的測量微阻的方法。整個系統(tǒng)包括硬件系統(tǒng)和軟件系統(tǒng),硬件系統(tǒng)包括恒流源設(shè)計,放大器設(shè)計,濾波電路設(shè)計及對被測電阻兩端電壓正反測電路;軟件系統(tǒng)主要是在飛針控制卡上完成,主要有基于FPGA的LMS算法程序,與工控機通訊的Socket程序。經(jīng)試驗證明,該測量板可以快速的測量PCB微阻以及快速的上傳數(shù)據(jù)至工控機,并且具有很高的測量精度和重復(fù)精度。
[Abstract]:In view of the actual need of PCB flying needle detection and the change of resistance caused by small defects of PCB, it is necessary to design a fast micro resistance measuring instrument with high precision. This paper discusses in detail the work flow of the existing flying needle testing machine. And the key factors that restrict the speed of the flying needle test machine are designed, and a new structure of flying needle testing machine system is designed, which is proved to be feasible in practical application. In order to extract useful signals from low signal-to-noise ratio (SNR) signals, the feasibility of analog circuits and digital signal processing methods are analyzed and simulated theoretically. The two methods are based on the analysis of the source and characteristics of noise, and the sources of noise and interference are also analyzed in this design. At the same time, the noise, the source of error and the detection method of weak signal are analyzed in detail in this paper, and a fast method based on FPGA is proposed. The whole system includes hardware system and software system. The hardware system includes constant current source design, amplifier design, filter circuit design and voltage forward and inverse measurement circuit. The software system is mainly completed on the flying needle control card, mainly based on the LMS algorithm program based on FPGA, and the Socket program which communicates with the industrial control computer. The experimental results show that the PCB microresistance can be measured quickly and the data can be uploaded to the industrial computer quickly, and it has a high precision of measurement and repetition.
【學(xué)位授予單位】：深圳大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN41
[Abstract]:In view of the actual need of PCB flying needle detection and the change of resistance caused by small defects of PCB, it is necessary to design a fast micro resistance measuring instrument with high precision. This paper discusses in detail the work flow of the existing flying needle testing machine. And the key factors that restrict the speed of the flying needle test machine are designed, and a new structure of flying needle testing machine system is designed, which is proved to be feasible in practical application. In order to extract useful signals from low signal-to-noise ratio (SNR) signals, the feasibility of analog circuits and digital signal processing methods are analyzed and simulated theoretically. The two methods are based on the analysis of the source and characteristics of noise, and the sources of noise and interference are also analyzed in this design. At the same time, the noise, the source of error and the detection method of weak signal are analyzed in detail in this paper, and a fast method based on FPGA is proposed. The whole system includes hardware system and software system. The hardware system includes constant current source design, amplifier design, filter circuit design and voltage forward and inverse measurement circuit. The software system is mainly completed on the flying needle control card, mainly based on the LMS algorithm program based on FPGA, and the Socket program which communicates with the industrial control computer. The experimental results show that the PCB microresistance can be measured quickly and the data can be uploaded to the industrial computer quickly, and it has a high precision of measurement and repetition.
【學(xué)位授予單位】：深圳大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN41
【參考文獻】
相關(guān)期刊論文 前10條
1 王甲峰;;弱周期信號的時域積分檢測法[J];兵工自動化;2007年09期
2 吳文全,葉曉慧;μΩ級小電阻測量方法研究[J];電測與儀表;2003年11期
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