Schottky diodes siv Schottky los thaiv qhov rov qab voltage ntawm cov hlau los yog semiconductor tiv tauj saum npoo, kom cov tam sim no tuaj yeem ua unidirectionally. Sib txawv ntawm cov tsoos diode, cov qauv ntawm Schottky thiab PN junction yog txawv heev. Fast rov qab diode, raws li lub npe implies, yog ib tug semiconductor diode uas yuav sai sai rov qab lub sij hawm rov qab. Daim ntawv no yuav qhia txog qhov sib txawv ntawm Schottky diode thiab ceev rov qab diode los ntawm cov qauv thiab cov yam ntxwv ntawm kev ua haujlwm.
Schottky diode
Nws yog ib tug diode ntawm "hlau semiconductor hlws ris" nrog Schottky yam ntxwv. Nws qhov pib pib voltage yog tsawg. Ntxiv nrog rau tungsten, cov txheej hlau kuj tuaj yeem ua los ntawm kub, molybdenum, npib tsib xee, titanium thiab lwm yam ntaub ntawv. Cov khoom siv semiconductor yog silicon lossis gallium arsenide. Cov cuab yeej no yog cov khoom siv hluav taws xob los ntawm cov neeg nqa khoom feem ntau, yog li nws qhov rov qab saturation tam sim no loj dua li ntawm PN hlws ris conductive los ntawm ob peb tus neeg nqa khoom. Vim tias cov nyhuv cia ntawm cov neeg nqa khoom tsawg hauv Schottky diode tsawg heev, nws cov lus teb zaus tsuas yog txwv los ntawm RC lub sij hawm tas li, yog li nws yog ib qho khoom siv zoo tshaj plaws rau kev hloov pauv ceev. Nws cov zaus ua haujlwm tuaj yeem ncav cuag 100GHz. Tsis tas li ntawd, MIS (hlau insulator semiconductor) Schottky diodes tuaj yeem siv los ua lub hnub ci lossis lub teeb emitting diodes.
Lub hauv paus ntsiab lus
Raws li cov ntsiab lus, cov qauv txheej txheem ntawm Schottky rectifier yog qhov txawv ntawm PN Junction Rectifier. PN junction rectifier feem ntau hu ua Junction Rectifier, thaum hlau ib nrab raj rectifier hu ua Schottky rectifier. Nyob rau hauv xyoo tas los no, Aluminium Silicon Schottky diodes tsim los ntawm silicon planar technology kuj tau tsim, uas tsis tsuas yog txuag cov khoom muaj txiaj ntsig zoo, txo cov nqi, tab sis kuj txhim kho qhov sib xws ntawm qhov tsis sib xws.
Lub Schottky rectifier siv tsuas yog ib tus neeg nqa khoom (electron) los thauj tus nqi, thiab tsis muaj kev sib sau ua ke ntawm cov neeg nqa khoom tsawg dua sab nraum qhov muaj peev xwm thaiv. Yog li ntawd, tsis muaj teeb meem cia them nqi (qrr → 0), thiab cov yam ntxwv hloov tau zoo dua qub. Lub sij hawm rov qab rov qab tuaj yeem luv luv kom tsawg dua 10ns. Txawm li cas los xij, nws qhov rov qab tiv thaiv tus nqi hluav taws xob yog qhov tsawg, feem ntau tsis ntau tshaj 100V. Yog li ntawd, nws yog tsim nyog los ua hauj lwm nyob rau hauv tsawg voltage thiab high tam sim no. Kev ua tau zoo ntawm cov hluav taws xob tsawg thiab qhov loj tam sim no rectifying (lossis freewheeling) Circuit Court tuaj yeem txhim kho los ntawm kev siv cov yam ntxwv ntawm qhov qis-voltage poob.
Fast rov qab diode
Fast rov qab diodes xa mus rau diodes nrog luv luv rov qab lub sij hawm (hauv qab 5us). Kub doping ntsuas tau txais yuav nyob rau hauv tus txheej txheem. Qee cov qauv siv PN hlws ris qauv thiab qee qhov tau txais kev txhim kho tus pin qauv. Nws qhov hluav taws xob poob rau pem hauv ntej yog siab dua li ntawm cov diodes zoo tib yam (1-2v), thiab qhov hluav taws xob thim rov qab yog feem ntau qis dua 1200V. Nyob rau hauv cov nqe lus ntawm kev ua tau zoo, nws tuaj yeem muab faib ua ob theem: rov qab sai thiab rov qab sai sai. Lub sijhawm rov qab los ntawm qhov qub yog ntau pua nanoseconds lossis ntev dua, thaum lub sijhawm tom kawg yog tsawg dua 100 nanoseconds.
Schottky diode yog lub diode raws li qhov muaj peev xwm cuam tshuam los ntawm kev sib cuag ntawm cov hlau thiab semiconductor. Nws yog hu ua Schottky diode luv luv. Nws muaj qhov txo qis rau pem hauv ntej ({{0}}}4-1.0v), lub sijhawm rov qab rov qab (0-10 nanoseconds), qhov rov qab xau loj tam sim no thiab tsis tshua muaj hluav taws xob, feem ntau qis dua 150V. Nws yog tsuas yog siv nyob rau hauv tsawg-voltage zaus.
Schottky diodes thiab ceev rov qab diodes feem ntau siv los hloov cov khoom siv hluav taws xob. Qhov txawv yog tias lub sij hawm rov qab los ntawm yav dhau los yog li 100 npaug me dua li yav tas los, thiab lub sij hawm rov qab los ntawm lub qub yog li ob peb nanoseconds. Cov qub muaj qhov zoo ntawm kev siv hluav taws xob tsawg, siab tam sim no thiab ultra-siab ceev.
Hauv kev tsim cov txheej txheem ntawm kev rov qab sai sai diode, kub doping, yooj yim diffusion thiab lwm yam txheej txheem tau txais yuav, uas tuaj yeem tau txais kev hloov pauv ceev thiab siab tiv taus voltage. Tam sim no, ceev rov qab diodes yog tsuas yog siv raws li rectifying ntsiab nyob rau hauv inverter fais fab mov.
Rov qab lub sij hawm rov qab
Lub sijhawm rov qab los yog dab tsi? Thaum qhov hluav taws xob ntawm sab nraud diode transients los ntawm kev taw qhia pem hauv ntej mus rau qhov kev taw qhia rov qab, qhov tam sim no ntws los ntawm lub cuab yeej tsis tuaj yeem hloov pauv hloov pauv hloov pauv mus rau pem hauv ntej mus rau qhov rov qab tam sim no. Lub sijhawm no, cov neeg nqa khoom tsawg (qhov) txhaj tshuaj rau pem hauv ntej yog muab rho tawm los ntawm cov hluav taws xob muaj zog ntawm thaj chaw them nqi. Txij li qhov ceev ntawm cov qhov no yog siab dua qhov sib npaug ntawm qhov sib npaug ntawm thaj av hauv paus, qhov rov qab tam sim no loj dua li qhov rov qab xau tam sim no yuav raug tsim tawm ntawm lub sijhawm rov qab tsis zoo, uas yog, qhov rov qab rov qab tam sim no IRM. Nyob rau tib lub sijhawm, kev txhim kho ntawm cov txheej txheem coincidence kuj ua rau kom txo qis ntawm cov neeg nqa khoom ntxiv ntxiv. Kom txog rau thaum cov cab kuj ntxiv nyob rau hauv lub hauv paus cheeb tsam kiag li ploj mus, qhov rov qab tam sim no txo thiab stabilizes rau qhov rov qab to tam sim no. Lub sijhawm coj los ntawm tag nrho cov txheej txheem yog lub sijhawm rov qab los.
Lub sij hawm rov qab los ntawm TRR txhais tau tias yog lub sijhawm luv luv thaum lub sijhawm tam sim no dhau los ntawm xoom taw tes los ntawm kev taw qhia pem hauv ntej mus rau tus nqi qis. Nws yog ib qho tseem ceeb kev ntsuas ntsuas ntsuas qhov ua tau zoo ntawm cov khoom siv hluav taws xob ntau zaus thiab cov khoom siv rectifier.
Cov yam ntxwv ntawm kev rov qab sai thiab ultra ceev rov qab diodes
Cov qauv sab hauv ntawm lub nrawm rov qab diode txawv ntawm qhov zoo tib yam diode. Nws ntxiv lub hauv paus cheeb tsam I ntawm p-hom thiab n-hom silicon cov ntaub ntawv los tsim tus pin silicon nti. Vim tias lub hauv paus cheeb tsam yog nyias nyias thiab qhov rov qab them rov qab yog me me, tsis tsuas yog tus nqi TRR txo qis heev, tab sis kuj tseem txo qis rau pem hauv ntej voltage poob, kom lub raj tuaj yeem tiv taus qhov ua haujlwm siab rov qab. Lub sij hawm rov qab rov qab ntawm lub diode rov qab sai yog feem ntau ntau pua nanoseconds, lub zog rau pem hauv ntej poob yog li 0.6V, qhov tam sim no rau pem hauv ntej yog ob peb amperes mus rau ntau txhiab amperes, thiab qhov rov qab siab siab voltage tuaj yeem ncav cuag ntau pua rau ntau txhiab volts. Tus nqi rov qab rov qab los ntawm ultrafast rov qab diode yog txo qis ntxiv, ua rau nws TRR qis li ob peb kaum ntawm nanoseconds.
Feem ntau ntawm kev rov qab sai thiab ultra ceev rov qab diodes hauv qab 20A yog nyob rau hauv daim ntawv ntawm TO-220 pob. Los ntawm kev xav ntawm cov qauv sab hauv, nws tuaj yeem muab faib ua cov yeeb nkab ib leeg thiab cov yeeb nkab sib txuas (tseem hu ua ob lub yeeb nkab). Muaj ob lub diodes rov qab sai hauv ob lub raj. Raws li cov kev sib txuas sib txawv ntawm ob lub diodes, muaj ob hom cathode rau raj thiab cov anode rau raj. Cov diodes rov qab sai nrog kaum tawm AMPs feem ntau tau ntim rau hauv -3p cov ntaub ntawv hlau. Cov hlab uas muaj peev xwm loj dua (ob peb puas mus rau ob peb txhiab a) tau ntim rau hauv daim ntawv bolt hom lossis phaj hom.
xeem txoj kev
Txoj kev kuaj niaj hnub
Nyob rau hauv cov xwm txheej pib xyaum ua, lub multimeter tuaj yeem ntes cov unidirectional conductivity ntawm ceev rov qab thiab ultra ceev rov qab diodes, nrog rau seb puas muaj qhib Circuit Court thiab luv Circuit Court faults nyob rau hauv, thiab tuaj yeem ntsuas qhov hluav taws xob txuas mus tom ntej. Yog tias nruab nrog lub megger, nws tuaj yeem ntsuas qhov rov qab tawg voltage.
Piv txwv li: ntsuas lub diode rov qab ultrafast, thiab nws qhov tseem ceeb tsis yog: TRR=35ns, yog=5a, IFSM=50a, VRM=700V. Tig lub multimeter rau R × Hauv iav 1, kev nyeem rau pem hauv ntej yog 6.4l, n=19.5l. Qhov rov qab tsis kam yog infinite. Ntxiv mus, VF=0.03V yog tau / × 19.{12}}.585V. Ua pov thawj tias cov yeeb nkab zoo.
teeb meem xav tau kev saib xyuas:
Qee lub raj ib leeg muaj peb tus pins tag nrho, thiab tus pin nruab nrab yog tus pin khoob, uas feem ntau yog txiav tawm thaum tawm hauv lub Hoobkas, tab sis qee qhov tsis raug txiav tawm;
Yog tias ib qho ntawm cov kav dej puas lawm, nws tuaj yeem siv los ua ib qho yeeb nkab;
R yuav tsum tau siv thaum ntsuas los ntawm kev poob siab × 1st iav. Yog tias R siv × Ntawm 1K iav, vim tias qhov ntsuas tam sim no me dhau, uas yog qis dua li qhov ua haujlwm tam sim no ntawm cov yeeb nkab, qhov ntsuas VF tus nqi yuav qis dua. Hauv qhov piv txwv saum toj no, yog tias R xaiv × Ntsuas ntawm 1K iav, qhov kev tiv thaiv pem hauv ntej yog sib npaug rau 2.2k, thiab lub sijhawm no, n=9 daim phiaj. Tus nqi VF suav tsuas yog 0.27v, uas yog qis dua tus nqi ib txwm (0.6V);
Lub sij hawm rov qab los ntawm qhov ceev rov qab diode yog 200-500ns;
Lub sijhawm rov qab los ntawm ultrafast diode yog 30-100ns;
Lub sijhawm rov qab los ntawm Schottky diode yog txog 10ns;
Ntxiv mus, lawv cov pem hauv ntej ntawm voltage kuj txawv. Schottky < ceev rov qab < high efficiency.