【摘要】：隨著電子產(chǎn)業(yè)的迅猛發(fā)展,PCB電性能指標(biāo)要求日益提高。傳統(tǒng)的PCB針床測(cè)試方式需要較長(zhǎng)時(shí)間和較高成本制作測(cè)試夾具,難以滿足小批量、多種類(lèi)樣品板和產(chǎn)品頻繁更新?lián)Q代的檢測(cè)需求。基于這些問(wèn)題,本論文中設(shè)計(jì)的飛針測(cè)試機(jī),根據(jù)PCB的Gerber文件快速生成測(cè)試資料,由飛針測(cè)試機(jī)運(yùn)動(dòng)控制系統(tǒng)快速移動(dòng)測(cè)試探針,與機(jī)器電測(cè)系統(tǒng)互動(dòng)快速進(jìn)行PCB電性能測(cè)試,有效彌補(bǔ)了針床測(cè)試方式的不足。電測(cè)系統(tǒng)是飛針測(cè)試機(jī)的重要組成部分,其性能直接決定了整機(jī)的測(cè)試效率和精度,在軟硬件設(shè)計(jì)時(shí)必須兼顧這兩個(gè)關(guān)鍵指標(biāo)。電測(cè)系統(tǒng)檢測(cè)PCB缺陷的方法有電容測(cè)試法、導(dǎo)通測(cè)試法、絕緣測(cè)試法、微阻測(cè)試法,在研究這些測(cè)試方法基礎(chǔ)上整合四種方法,對(duì)提高機(jī)器整體性能具有重要意義。本文首先論述了飛針測(cè)試機(jī)的整體架構(gòu),分析了制約飛針測(cè)試機(jī)檢測(cè)效率的幾點(diǎn)因素,提出了能改進(jìn)效率的一套系統(tǒng)架構(gòu)。然后針對(duì)系統(tǒng)架構(gòu)中的電測(cè)系統(tǒng)部分進(jìn)行了方案制定和具體軟硬件設(shè)計(jì)。在電測(cè)系統(tǒng)設(shè)計(jì)理論部分,首先分析了飛針的組合方式,確定了微阻測(cè)試四線制接線方式,對(duì)微阻測(cè)量的信號(hào)噪聲問(wèn)題進(jìn)行了分析,其次對(duì)硬件系統(tǒng)進(jìn)行了選型和設(shè)計(jì),主要包括恒流源與高壓測(cè)試源電路、AD/DA轉(zhuǎn)化電路、電容測(cè)試電路、信號(hào)采集電路、電源電路等部分。在軟件設(shè)計(jì)部分,主要以STM32F303為控制核心,由它管理測(cè)量和通信流程,該部分根據(jù)實(shí)際需求制定了通信協(xié)議,給出了硬件初始化、硬件自檢子程序、數(shù)據(jù)采集和中位值濾波等程序的實(shí)現(xiàn)流程,并進(jìn)行了軟件設(shè)計(jì)。在實(shí)驗(yàn)室對(duì)電測(cè)系統(tǒng)各個(gè)功能進(jìn)行了測(cè)試,驗(yàn)證了本系統(tǒng)硬軟件設(shè)計(jì)的可行性,實(shí)現(xiàn)了飛針測(cè)試機(jī)四種電測(cè)方法及其整合,達(dá)到了電測(cè)系統(tǒng)的測(cè)量精度和效率的初步要求。此外,在飛針測(cè)試機(jī)現(xiàn)場(chǎng)進(jìn)行了聯(lián)調(diào)測(cè)試,并且在工控機(jī)上分別導(dǎo)出了四種測(cè)試方法的測(cè)試數(shù)據(jù),對(duì)數(shù)據(jù)進(jìn)行了分析,除去機(jī)器本身的脈沖干擾,測(cè)試數(shù)據(jù)具有良好的線性度和重復(fù)度。測(cè)試結(jié)果證明,飛針測(cè)試機(jī)電測(cè)系統(tǒng)具有較好的測(cè)量精度,并能配合機(jī)器運(yùn)動(dòng)控制系統(tǒng)進(jìn)行快速測(cè)量。具有良好的應(yīng)用前景。
[Abstract]:With the rapid development of electronic industry, the requirements of PCB electrical performance index are increasing. The traditional testing method of PCB needle bed needs a long time and high cost to make the test fixture, which is difficult to meet the test demand of small batch, many kinds of sample boards and products frequently updated. Based on these problems, the flying needle tester designed in this paper generates the test data quickly according to the Gerber file of PCB, moves the test probe quickly by the motion control system of the flying needle tester, and interacts with the electrical testing system of the machine to carry out the PCB electrical performance test quickly. Effectively make up for the lack of needle-bed testing. The electric measuring system is an important part of the flying needle tester. Its performance directly determines the testing efficiency and precision of the whole machine. The two key indexes must be taken into account in the design of software and hardware. The methods of detecting PCB defects in electric measuring system include capacitance test, conduction test, insulation test and micro-resistance test. It is of great significance to improve the overall performance of the machine by integrating four methods on the basis of studying these testing methods. This paper first discusses the whole structure of the flying needle tester, analyzes several factors that restrict the testing efficiency of the flying needle tester, and puts forward a set of system architecture which can improve the efficiency of the flying needle tester. Then, the scheme and the hardware and software are designed for the electrical measurement system in the system architecture. In the part of the design theory of the electric measurement system, the combination mode of the flying needle is analyzed, the four-wire connection mode of the micro-resistance test is determined, the signal noise problem of the micro-resistance measurement is analyzed, and the hardware system is selected and designed. It mainly includes AC / DA conversion circuit, capacitance test circuit, signal acquisition circuit, power supply circuit and so on. In the part of software design, STM32F303 is used as the control core, which manages the measurement and communication flow. According to the actual requirements, the communication protocol is established, and the hardware initialization and hardware self-checking subprogram are given. Data acquisition and median value filtering and other programs are implemented, and software design is carried out. The functions of the electric measurement system are tested in the laboratory, the feasibility of the hardware and software design of the system is verified, and the four electric measuring methods and their integration of the flying needle tester are realized, which meet the primary requirements of the measuring accuracy and efficiency of the electric measuring system. In addition, the test data of four kinds of test methods are derived from the field of the flying needle test machine, and the test data are analyzed to remove the pulse interference of the machine itself. The test data have good linearity and repetition. The test results show that the flying needle test electromechanical measurement system has good measurement accuracy and can be quickly measured with the machine motion control system. It has good application prospect.
【學(xué)位授予單位】：深圳大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TN41

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 馮佳;李佩s，

本文編號(hào)：2155138