BUCK型DCDC的电流检测电路设计

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1、国内图书分类号：TN432西南交通大学研究生学位论文BUCK型DC-DC的电流检测电路设计年级三QQ四玺姓名鎏坚申请学位级别亟±专业煎皇壬堂皇固生皇王兰指导教师墨全近熬援二oo七年五月西南交通大学硕士研究生学位论文第1I页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