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《畢設(shè)論文 于基ansys大功率led器件的封裝結(jié)構(gòu)優(yōu)化設(shè)計(jì) 說明書.doc》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。
1、編號(hào):畢業(yè)設(shè)計(jì)說明書題目:大功率LED器件的封裝結(jié)構(gòu)優(yōu)化設(shè)計(jì)題目類型:¨理論研究¨實(shí)驗(yàn)研究¨工程設(shè)計(jì)t工程技術(shù)研究¨軟件開發(fā)摘要本文以某大功率LED為背景,在查閱國內(nèi)外大量文獻(xiàn)的基礎(chǔ)上,經(jīng)過對各種參數(shù)化建模和優(yōu)化技術(shù)方法的探索和研究,提出了直接在有限元平臺(tái)上利用APDL語言進(jìn)行其溫度場和應(yīng)力場分析的基礎(chǔ)上,對該LED結(jié)構(gòu)參數(shù)優(yōu)化設(shè)計(jì)。本文中,針對一種功率半導(dǎo)體器件——大功率LED照明燈具的封裝與組件進(jìn)行散熱設(shè)計(jì),通過有限元模型,分析其在工作狀態(tài)時(shí)的穩(wěn)態(tài)溫度場分布,發(fā)現(xiàn)LED封裝整體的溫度梯度比較大,而封裝陶瓷基板和熱沉基座是阻礙器件散熱的主要部分。為此,提出幾種LED的優(yōu)化方案
2、,并進(jìn)行了簡單分析。本文的優(yōu)化設(shè)計(jì)可從三個(gè)方面對所選用的LED進(jìn)行封裝結(jié)構(gòu)優(yōu)化設(shè)計(jì):第一種情況:優(yōu)化目標(biāo)為芯片溫度,約束條件為各尺寸的范圍,在第7次達(dá)到優(yōu)化。由最佳優(yōu)化系列可以看出,芯片的最高溫度已降至56.399℃,比優(yōu)化前降低了將近20%。第二種情況:優(yōu)化目標(biāo)為結(jié)構(gòu)重量。對結(jié)構(gòu)重量優(yōu)化時(shí),約束條件為各尺寸的范圍,狀態(tài)變量取芯片溫度。經(jīng)過13次后收斂,在第10次時(shí)最優(yōu),重量值為8.1873g;第三種情況:優(yōu)化目標(biāo)為VonMises應(yīng)力,當(dāng)優(yōu)化目標(biāo)為封裝應(yīng)力時(shí),約束條件取各尺寸范圍,狀態(tài)變量分別為芯片溫度和結(jié)構(gòu)重量,在達(dá)到最優(yōu)時(shí),最大應(yīng)力為50.052MPa,降幅達(dá)11.3%。
3、關(guān)鍵詞:大功率LED;散熱;有限元模擬;ANSYS;結(jié)構(gòu)優(yōu)化AbstractThemethodof3DParametric-modelingbyAPDLlanguageispointedoutforsomeLEDinthispaper.Thisworkisbasedonalotofreferencesandmanytheoriesaboutparametricmodeling,andstructuraloptimization.Furthermore,thestructuraloptimizationfortheLEDisfinishedafteraseriesofworkin
4、cludingtheanalysisofthetemperaturegradientandthestressgradient.Inthispaper,thethermalanalysisofpackageproductsinahigh-powerwhiteLEDlightfittingwasinvestigatedinthispaper.AccordingtotheFEMcalculation,thestatictemperaturefieldintheworkingprocesswasanalyzed.ThetemperaturegradientintheLEDpackage
5、structurewasfound.Ceramicsubstrateandheat-sinkbasewereconsideredasthemainparttoblockheatdissipation.Therefore,severaloptimizationdesignsofLEDwereputforward,andtheirsimulationresultswereanalyzedsimply.TheoptimizationofthisarticlecanbechosenfromthethreeaspectsoftheLEDpackagestructureforoptimal
6、design.Thefirstkindofcircumstances:theobjectivefunctionwaschiptemperature,andconstraintconditionwaseachsizerange.Therewastheoptimizationintheseventhtime.Fromthebestseries,itcanbeseenthatthehighesttemperatureofchiphasfallento56.399degreesCelsiusthanbefore,andoptimizednearly20%lower.Thesecondk
7、indofcircumstances:theobjectivefunctionwasweightofstructure.Whenoptimizingweightofstructure,constraintconditionwasalsoeachsizeandthechiptemperaturewastakenstatevariables.After13times,itachievedtoconvergence.Therewastheoptimalinthefirst10times,weigh