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1、PowerSupplyTopologies電源拓?fù)浣Y(jié)構(gòu)AMOI家用系統(tǒng)設(shè)計(jì)部PowerSupplyTopologies電源拓?fù)浣Y(jié)構(gòu)AMOI家用系統(tǒng)設(shè)計(jì)部TheMostPopularTopologies最常見的拓?fù)浣Y(jié)構(gòu)Buck降壓Boost升壓Buck-Boost降壓-升壓Flyback反激Forward正激Two-TransistorForward雙晶體管正激Push-Pull推挽HalfBridge半橋FullBridge全橋SEPICC’ukDetailsoftheCircuitOperatio電路
2、工作的細(xì)節(jié)TheBasicPulse-WidthModulatedWaveform基本的脈沖寬度調(diào)制波形Thesetopologiesallrelatetoswitched-modecircuits.這些拓?fù)浣Y(jié)構(gòu)都與開關(guān)式電路有關(guān)。Definitionofthebasicpulse-widthmodulatedwaveformisasfollows:基本的脈沖寬度調(diào)制波形定義如下:占空比=負(fù)荷比Buck降壓Buckstheinputdowntoalowervoltage.把輸入降至一個(gè)較低的電壓。Per
3、hapsthesimplestofall.可能是最簡(jiǎn)單的電路。Theinductor/capacitorfilteraveragestherectangularwavefromtheswitch.電感/電容濾波器濾平開關(guān)后的方波。Outputisalwayslessthanorequaltotheinput.輸出總是小于或等于輸入。Inputcurrentisdiscontinuous(chopped).輸入電流不連續(xù)(斬波)。Outputcurrentissmooth.輸出電流平滑。負(fù)載Boost升壓
4、Booststheinputtoahighervoltage.把輸入升至一個(gè)較高的電壓。Likethebuck,butinductor,switchanddiodearerearranged.與降壓一樣,但重新安排了電感、開關(guān)和二極管。Outputisalwaysgreaterthanorequaltotheinput.輸出總是比大于或等于輸入。(neglectingtheforwardvoltagedropofthediode).(忽略二極管的正向壓降)。Inputcurrentissmooth.輸
5、入電流平滑。Outputcurrentisdiscontinuous(chopped).輸出電流不連續(xù)(斬波)。負(fù)載Buck-Boost降壓-升壓Anotherarrangementoftheinductor,switchanddiode.電感、開關(guān)和二極管的另一種安排方法。Combinesnegativecharacteristicsofboththebuckandtheboost.結(jié)合了降壓和升壓電路的缺點(diǎn)。Inputcurrentisdiscontinuous(chopped).輸入電流不連續(xù)(斬
6、波)。Outputcurrentisalsodiscontinuous(chopped).輸出電流也不連續(xù)(斬波)。Outputisalwaysinvertedfromtheinput(notecapacitorpolarity),butcanbeoflessorgreatermagnitude.輸出總是與輸入反向(注意電容的極性),但是幅度可以小于或大于輸入。The“flyback”converterisactuallyanisolated(transformercoupled)versionofth
7、ebuck-boost.“反激”變換器實(shí)際是降壓-升壓電路隔離(變壓器耦合)形式。負(fù)載Flyback反激Operateslikethebuck-boost,buttheinductorhastwowindingsandperformsbothasatransformerandinductor.如降壓-升壓電路一樣工作,但是電感有兩個(gè)繞組,而且同時(shí)作為變壓器和電感。Outputcanbeeitherpositiveornegative,dependingonthepolarityofthewinding
8、anddiode.輸出可以為正或?yàn)樨?fù),由線圈和二極管的極性決定。Outputvoltagecanbeeitherlessthanorgreaterthantheinputvoltage,dependingontheturnsratioofthetransformer.輸出電壓可以大于或小于輸入電壓,由變壓器的匝數(shù)比決定。Thisisthesimplestoftheisolatedtopologies.這是隔離拓?fù)浣Y(jié)構(gòu)中最簡(jiǎn)單的。Multip