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ID:55784068
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页数:8页
时间:2020-06-01
《电子专业英语教学课件作者高明辉第8章.ppt》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、Warming-upI.Canyoupointoutthenameofthefollowingpictures?II.Doyouknowwhatthefollowingabbreviationsorsymbolsstandfor?KVLKCLP-NjunctionUnit8Diodes下一页返回III.TalkaboutCurrentinEnglish.Andthefollowingpatternsyoucanuse:Doyouknowadiode?Couldyoutellmehowmanykindsofdiodesthereare?Andwhataret
2、hey?Whatisadiodesusuallyusedas?TextComprehensionDiodeAsemiconductordiodeisatwo—terminaldevice,containingasingleP-Njunctionwithtwoleads,ananodeandacathode.Thediodeallowscurrenttoflowinonlyonedirection.ThegeneralcircuitsymbolforadiodeisshowninFig-1alongwithitsrelationshiptotheP—Nstr
3、ucture.Unit8Diodes上一页下一页返回Adiodeisforwardbiasedwhenthevoltageofitsanodeishigherthanthevoltageofitscathode.Insuchsituation,currentwillflow.Whenthediodeisreversebiased,i.e.thevoltageofitsanodeislowerthanthevoltageofitscathode,itcausesnocurrent.Generally,diodeapplicationscanbeclassif
4、iedaccordingtothethreeregionsofdiodeoperation.Switchingandrectifyingapplicationsinvolvetransitionsbetweenthereverse—biasandforward—biasregion.Insuchapplications,caremustbetakentochooseadiodewithareversebreakdownvoltagelargeenoughtopreventundesiredreversebreakdown.Adiodeisusuallyus
5、edasarectifierbecauseofitscharacteristic.Thevalueofarectifierisexpressedinamperes.Furthermoretherearenumeroustypesofdiodes,suchasZenerdiodes,photodiodes,light—emittingdiodesetc.Unit8Diodes上一页下一页返回Thediodeisthefirstnetworkelementweencounterthatisstrikinglynonlinearinthemiddleofitsn
6、ormaloperatingrange.BothKVLandKCLcanbeused,sincetheirvaliditydoesnotdependonthelinearityornonlinearityofthenetworkelements.However,wemustbecarefulintheuseofsuperposition,Theveninequivalents,andNortonequivalents,becausethesemethodsareexplicitlyrestrictedtolinearnetworks.Wecansepara
7、tethelinearnetworkfromthenonlinearelementsandcarryoutagraphicalsolutionforthevoltageandcurrentinthenonlinearelements.VocabularySemiconductorn.半导体reverseadj.相反的反向的junctionn.连接,交叉点classifyvt.把…分类leadn.导线rectifyvt.把…整流anoden.阳极,正极rectifiern.整流器Unit8Diodes上一页下一页返回cathoden.阴极characteri
8、sticn.特征,特性biasedadj.偏置的,偏压的amper
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