SIUCON CONTROLLED RECTIFIER SCR thu Ww a fem Conductor deuce -that acs aM Gn elechonc (wilh - Je Go Change anrernnhiny Current — wr to ae Current @nd «at the Same haw oe Contr {he smoval oy four! ped ty 1h loae Te combnes fhe fea ures of a recherer and a tronsitter -fin SCR of G dhevee-dtrm ina (, there uachon, four yar Kmicenductor deuce thot” iF desig rel th perfam Switching funchons Cons TRuction Gata) Syinbe | A q ~ When & pn punchon ip added ty a suncfien Frensistor Ate resulhing dhe pr junchen deuce li Glled a Silicon” Condolled rechyiet. the Constuchen above shows on evdinary rechpitr (pa) Arc @& JunChon transister (AP) Combined in one uncl do form papa device Three Aerminalr ave daken ; one from 42 outer p-type madertal Cano de), Second from tho puter N-type motensl Cemthese) and the Atird from the base of HvenSishy Rchon (gate) = ln novma! operating conditions gy SER, Anode is fold ae hagh fositve potennrs | with respect yy Cathode and go at Smiall positvea, podenhal awith yespect Te Cathode fle SOR FG Solid Hate equivalent of Hhyratvon ; dhe get, anode ama Carthoue (arvespond to grid, plate anc Cathode % & thyrsdron for Hts yearn, HS Sometimes % Athy aster lle 4 OPER ATION [when Ae gre uw _open, mo voltage if cpplied fy dhe gate as Shawn below: Under 4ar Condihon, Junthon Ja sf reverse et knased athale yunchen Jr and Ja sre ferwerd brated - fine one of dhe Hwee junchonr Ja) wv revert buarecl No Cunent Flows Herrevsh Ha toa Re Gaol 4? (CR Sf GH OF . However, if the appled voldage # gracucly inqeaed, @ Mage yeqclid avian reve bared junchen Jy breaKs dewa L fhe SR Conduct heawi ly and i Sael fo ee on The voltage a avluck scr Conducts heavily whet gat voltage caflecl breqKkover voltage. Ns wltege~ P= att (fF postive wort CafRock, dle SCR Gin he mack fo Conduct hea ly at JImealler Applet voltage by applying a snail posihve Potential to “He Ga7e al Shown below’ | | 7 | { Re 7 a Sh = AWWA fi] ~~ “tie *. + Now Juntien J3 if forward nase! and Junchon Ja iS aeverse biqsted. - Tre Chchors from n-type madenal Sort Moving Acros Jy dpnervedr lege avhereas holes from p-type dovtrds right —Comnse Guandtly , the elections from Ja ove athacted! across ‘Junehen Ja and 964 current Serif flowing ade currené flor, anode Current Ar ston as ncreases. Bede makes more electronl avaable at Juncticn Je —FhiS prowess Gantnuer and in an extremely Swall Aine, Ja bréaks down and the Sek Sfeydt Conducting Asewily —One sca Sart conductny, te gate loser all contro! , tven Ff gate voltage oe Rmoved,=~ eS - av Current does rot decrease at afl ~ r ‘Tne only wey to Stop cone 4 ‘ if onduchon ir to Yedue Flo apples vo Hage *y Zero Gnelunon fhe Sev has Avo ffekr ve etter ie doe pot tonduct oy cb Conduct’ hearily, Here © No finde in between -fhererore it Lehaver hime la Sindh fhere Gre deo ways fy din on the Scr the fist © fo beep +e ger ofen anc make 4e Supply vollage gual 4 breakover voltage ancl He a ip ES, He Second i “Ap oporue He Se rsith — Setyplis®@ yaa had than breakover voltage Qnd dum ue om& Meant Of a Snelf i4age appl ee ae oy a mall postive vel Fay Applying JSmatl fositve Voldeage hd de qite ie the femal way to Clore he Jee fecause Fhe byeqkover Uiage of usually much greeter than Supply voltage . To open the JR, reduce #e Supply vp tage 7 Zero . @ I~ When appropnsvte gate Current 1S passec! the SCR Sens Conduchng hecui ly md femaias in Afys fesition in depinitely even ip the gat voltage Uf remeved. Thas vacate tm fhe ON, posinon . —flowever, when the anode current if seducedCy a > Sa f 0 w@ 4a dh ho loli = §- ow ohling current, she SCR (tf furntd - Se cn Clay that fhe laheviove Of fhe SR aan fy Fe a mechanvies! grat 4 = fherefore , appropri de al an electron Math Cll 4 SCR 40 Advandager le hat no moving part, es norse (er operation at high espiceny : Tuyjtcling feted WC vee Ligh upto fo" oparaters ney Seconcl in . fhe load enue tanto! over larg? curred Ong th—e Pall 94 he by meant of 4 Jmal gate ‘ §CR Swi teHins [furning the SCR ON = In ever to dur ar Ho gate vo Hage Ve if jnereated upte do jnihat Aig genirs - 2 Current * Fe SE, a Minimum value of rte at whack de SER Minimua value calle of gate An gserins Yalta is ducnec on if Nor. the sesulting F478 cimrent. i called ett dngaerin current Iqr- Beat Thus do wen on an SCR all that we have A do © do appl ositve fe voltage Gus! Ao Var ov part doh Current equs! Fede. Furning +ho (ce ore - “fhe SCV” 4urn-of¢ poses move problems fhan ser dyen- on Le 6 because one dra devs ce uw on, fhe gate loses condrot- “The only way to porn & ofe- ¢- Re is fy Shp eniede Current Aeros h u- Thor” &)| chrconmecnny b) | Shor hing Ko Jee c} W tan be acheved by He SCR fron us Jupely voltage | veverstng fle polority of Ae anode. cathode “vale |. fhe ypcedure of Jiuit hing of | exiled Commutarhen - gn SCP Applicator ~ fey powell ; is Fe Gee control of dC Shunk Cate et 5 voltage - fenrit | fy protection agent (oads — for pechcation lin oy tant derms Reakover vo Herge — £ dha Minimum foyweord voltage , Jade being oer, af rulach He JER Garde Gnduchag heauly. e- jt w dhe maximum revere voltage ( Cathode being positive we anode) that~ cin be apoled to 50 ser Avitheve Conductng jn ‘fhe reverse dureetien curvene le ir HO meximem anode Curent gad being open, at whath See turned Of from of) conedifien. word current rating — fe w f€g maximum Curent Fat an fer we Ca pa ble withovl deptruchen ( EY rachng — dhe product of spun? urge Current and he oF Sarge con vol