本文關(guān)鍵詞：電源電路器件建模及WCA技術(shù)研究　出處：《西安電子科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 最壞情況分析 電源 Saber 建模

【摘要】：最壞情況電路分析(Worst Case Analysis,WCA)是一項(xiàng)在設(shè)計(jì)限度內(nèi)預(yù)測(cè)電路性能穩(wěn)定性的技術(shù)。在航天應(yīng)用中對(duì)電源系統(tǒng)的可靠性要求很高,最壞情況分析是必須執(zhí)行的一步。然而,國(guó)內(nèi)各個(gè)設(shè)計(jì)分析單位沒有統(tǒng)一的電路分析工具,缺少航天專用元器件的測(cè)試參數(shù),進(jìn)行最壞情況電路分析的單位很少,少數(shù)進(jìn)行WCA的單位使用的分析方法也不一致,難以對(duì)分析結(jié)果進(jìn)行統(tǒng)一的評(píng)判。本文主要研究電源電路的最壞情況分析技術(shù),并針對(duì)行業(yè)內(nèi)廣泛應(yīng)用的Saber工具,給出了元器件建模、最壞情況分析的具體方法及詳細(xì)流程。具體研究?jī)?nèi)容如下:1.研究了最壞情況分析技術(shù)的方法論。介紹了最壞情況電路分析的相關(guān)概念,包括參數(shù)容差分析技術(shù)、靈敏度分析技術(shù)、最壞情況電路性能分析和最壞情況元器件應(yīng)力分析,比較了WCA的三種方法,并提出了基于Saber工具的電路設(shè)計(jì)與WCA流程,提出建立一個(gè)完備的宇航專用器件數(shù)據(jù)庫(kù)以及建立完善的元器件模型庫(kù)是利用軟件工具進(jìn)行電路設(shè)計(jì)與WCA的關(guān)鍵,而且直接影響到仿真分析結(jié)果的精度。2.研究了在Saber仿真環(huán)境下的元器件建模方法�？偨Y(jié)了Saber工具中常用的幾種建模方法,并針對(duì)常用元器件(二極管、三極管、MOSFET、運(yùn)放和數(shù)字元器件等)分別給出了建模方法,對(duì)比了同類器件的不同建模方法與適用性,而且每類器件的建模都給出了具體的實(shí)例與電路驗(yàn)證方法。3.研究了開關(guān)電源的基本原理。討論了開關(guān)電源的類型、工作原理和控制方式,并在Saber仿真環(huán)境下,設(shè)計(jì)了一個(gè)Boost型電壓變換器,將12V輸入電壓轉(zhuǎn)換為20V輸出電壓,仿真驗(yàn)證了其滿足各項(xiàng)性能指標(biāo)。4.研究了利用Saber工具對(duì)電路進(jìn)行設(shè)計(jì)與WCA的方法。介紹了Saber集成的靈敏度分析工具、Monte Carlo分析工具、最壞情況分析工具、應(yīng)力分析工具的使用方法與特點(diǎn)。并以本文設(shè)計(jì)的Boost電路為例進(jìn)行了最壞情況分析,利用不同方法進(jìn)行WCA。仿真表明:利用Saber的最壞情況分析工具分析得到的電路性能參數(shù)最劣,該工具采用快速搜索算法能較快得到極值點(diǎn);利用Monte Carlo分析工具的分析結(jié)果依賴于抽樣的次數(shù)以及電路參數(shù)容差的分布,在抽樣次數(shù)不多時(shí),存在抽不到電路最壞情況的可能性,但是可以得到電路性能參數(shù)的分布。通過靈敏度分析與最壞情況分析對(duì)電路的性能進(jìn)行了改善,減小了輸出電壓的偏差范圍。對(duì)電路進(jìn)行最壞情況應(yīng)力分析發(fā)現(xiàn)電流采樣電阻和電感過應(yīng)力,證明了WCA的重要性,即使電路性能參數(shù)滿足要求,但是依然存在可靠性問題,通過WCA可以發(fā)現(xiàn)電路的薄弱環(huán)節(jié),輔助設(shè)計(jì)者進(jìn)行元器件選型和電路加固。
[Abstract]:Worst Case Analysis. WCA is a technique to predict circuit performance stability within design limits. In aerospace applications, the reliability of power supply systems is very high, and the worst case analysis is a necessary step. There are no uniform circuit analysis tools for each design and analysis unit in China, and the test parameters of special aerospace components are lacking, and very few units carry out the worst case circuit analysis. The analysis methods used by a few units carrying out WCA are also inconsistent, so it is difficult to judge the analysis results uniformly. This paper mainly studies the worst-case analysis technology of power supply circuits. According to the widely used Saber tools in the industry, the component modeling is given. The concrete method and detailed flow of the worst-case analysis are as follows: 1. The methodology of worst-case analysis technique is studied, and the related concepts of the worst-case circuit analysis are introduced. It includes parameter tolerance analysis, sensitivity analysis, worst-case circuit performance analysis and worst-case component stress analysis. Three methods of WCA are compared. The circuit design and WCA flow chart based on Saber tools are also presented. It is proposed that the establishment of a complete database of special aerospace devices and the establishment of a perfect model library of components are the key to the circuit design and WCA using software tools. And directly affect the accuracy of simulation analysis results. 2. The modeling method of components in Saber simulation environment is studied. Several modeling methods commonly used in Saber tools are summarized. The modeling methods for common components (diodes, transistor MOSFETs, operational amplifiers and digital components etc.) are given, and the different modeling methods and applicability of similar devices are compared. And the modeling of each kind of devices gives concrete examples and circuit verification methods. 3. The basic principle of switching power supply is studied. The type, working principle and control mode of switching power supply are discussed. In the environment of Saber simulation, a Boost voltage converter is designed to convert 12V input voltage to 20V output voltage. Simulation results show that it meets the performance requirements. 4. The method of designing circuit and WCA using Saber tool is studied. The sensitivity analysis tool of Saber integration is introduced. Monte Carlo analysis tool, worst-case analysis tool, stress analysis tool use method and characteristics. And taking the Boost circuit designed in this paper as an example, the worst-case analysis is carried out. The simulation results show that the circuit performance parameters are the worst by using the worst-case analysis tool of Saber, and the extremum can be obtained quickly by using the fast search algorithm. The analysis results using Monte Carlo analysis tool depend on the number of sampling and the distribution of circuit parameter tolerance. When the sampling number is small, there is the possibility that the worst case of the circuit can not be pumped. However, the distribution of circuit performance parameters can be obtained. The performance of the circuit is improved by sensitivity analysis and worst-case analysis. By analyzing the worst-case stress of the circuit, it is found that the current sampling resistance and the inductor overstress prove the importance of WCA, even if the circuit performance parameters meet the requirements. However, there is still a reliability problem. The weak links of the circuit can be found by WCA, and the component selection and circuit reinforcement can be assisted by the designer.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN86

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本文編號(hào)：1391569