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1、國內(nèi)圖書分類號：TN432西南交通大學(xué)研究生學(xué)位論文BUCK型DC-DC的電流檢測電路設(shè)計年級三QQ四璽姓名鎏堅申請學(xué)位級別亟±專業(yè)煎皇壬堂皇固生皇王蘭指導(dǎo)教師墨全近熬援二oo七年五月西南交通大學(xué)碩士研究生學(xué)位論文第1I頁AbstractTherapiddevelopmentofthelarge-scaleintegration(LSObringsforththeincreasinglysmallerelectronics，whichinturnacceleratestheflourishingofportableelectronics．Meanwhiletheg
2、rowingnewfeaturesandcapacitiesmakeelectronicsmoreandmorecomplex，andthisposesevengreaterchallengestopowersupply,whichservesasthecoreoftheoperationofelectronics．TheDC-DCconverters，characterizedbyhighefficiencyandlowpower,haveWOnanirreplaceablepositionintheelectronicsmarket．Thusitisofgre
3、atsignificancetotrytostudyandimprovetheperformanceofDC-DCconverters．Apartfromsatisfyingtherequirementsofpowersupplyproducts，powersupplieshavetobeprotectedineachandeveryway．Amongalltheprotectionmeasures，over-currentprotectionisoneofthemostdesirableoneformanyDC-DCconvertersagainsttheacc
4、identaldamagesasaresultofoverloadorshortcircuit．Andcurrentdetectingisthekeyofover-currentprotection．Afteranalyzingtheadvantagesanddisadvantagesofthetraditionaldetectingmeasures，thispaperproposestoworkoutacurrentdetectingcircuitofhighperformanceandsuitablefortheBUCKDC-DCconverterincurr
5、ent．contr01．modeinorderthatitcoulddetectthecurrentintimeandprotectthechipeffectively．Thefirstpartofthispaperintroducesthebackgroundandsignificanceofthisresearch；thesecondpartcomestodiscusssomekindsofcurrentsensingcircuits．Afterthat，onthebasisofthepriorknowledge,wesuccessfullyschemeout
6、anover-currentprotectioncircuitwhichincludesacurrentsensingcircuitandacurrentlimitingcircuit．Theprincipleofcurrentsensingisasfollows：ifoneinputofdifferentialamplifierisconnectedtopowerelements，theinputvoltageattheotherendwouldbeequaltothatatthematchingpoint．Thispaperusesafoldedcascade
7、operationalampliferforcurrentsensing，andatelescopiccascadeoperationalamplifierforcurrentlimiting．CircuitsdesignedbyCMOStechnologyhavetheircompetitiveadvantagesl··’evensmallerelementsize，fasterspeedofMOSFETs，lowpowerconsumptionandlowcost．Sothiscircuitismanufacturedbynormal0．缸mCMOStechn
8、ology
