Cov kws tshaj lij kho vajtse qhov kev paub dhau los hauv kev hloov hluav taws xob tsim qauv
Hloov cov khoom siv hluav taws xob muab faib ua ob hom, cais thiab tsis cais. Ntawm no peb tsuas yog tham txog topology ntawm kev sib cais hloov hluav taws xob khoom siv. Hauv qab no, tshwj tsis yog tias tau teev tseg, lawv txhua tus xa mus rau cov khoom siv hluav taws xob cais. Raws li cov qauv sib txawv, cov khoom siv hluav taws xob sib cais tuaj yeem muab faib ua ob pawg: pem hauv ntej thiab flyback. Lub flyback txhais tau hais tias thaum thawj sab ntawm lub transformer yog qhib, lub thib ob sab yog muab tua, thiab lub transformer khaws lub zog. Thaum thawj sab raug txiav tawm, qhov thib ob sab yog qhib, thiab lub zog tawm mus rau lub xeev ua haujlwm ntawm lub nra. Feem ntau, cov pa flyback fais fab mov muaj ntau dua ib leeg, thiab ob lub raj tsis muaj ntau. Hom rau pem hauv ntej txhais tau hais tias thaum thawj sab ntawm lub transformer yog qhib, lub thib ob sab induces tus coj voltage thiab outputs nws mus rau lub load, thiab lub zog yog ncaj qha mus rau lub transformer. Raws li cov lus qhia tshwj xeeb, nws tuaj yeem muab faib ua cov pa rau pem hauv ntej, suav nrog ib lub raj rau pem hauv ntej thiab ob lub raj rau pem hauv ntej. Ob qho tib si ib nrab choj thiab choj circuits yog rau pem hauv ntej circuits.
Forward thiab flyback circuits muaj lawv tus kheej cov yam ntxwv, thiab lawv yuav siv tau yooj yim nyob rau hauv thiaj li yuav ua tau tus nqi zoo tshaj plaws nyob rau hauv tus txheej txheem ntawm tsim lub Circuit Court. Feem ntau, hom flyback tuaj yeem siv rau lub sijhawm tsis muaj zog. Ib qho loj me me tuaj yeem siv ib lub raj rau pem hauv ntej Circuit Court, lub zog nruab nrab tuaj yeem siv ob lub raj rau pem hauv ntej lossis ib nrab-bridge Circuit Court, thiab lub laub rub tawm tuaj yeem siv rau qhov tsis tshua muaj hluav taws xob, uas yog tib yam li cov ib nrab choj. Rau cov zis hluav taws xob siab, feem ntau siv lub tshuab hluav taws xob, thiab lub tshuab thawb-rub kuj tseem siv tau rau qhov tsis tshua muaj hluav taws xob.
Vim nws cov qauv yooj yim, lub flyback fais fab mov txuag ib qho inductance uas yog hais txog qhov loj tib yam li lub transformer, thiab yog siv dav hauv cov khoom siv hluav taws xob me thiab nruab nrab. Hauv qee qhov kev qhia, nws tau hais tias lub zog ntawm flyback fais fab mov tuaj yeem ncav cuag kaum tawm watts, thiab tsis muaj qhov zoo dua yog tias lub zog tso zis ntau tshaj 100 watts, thiab nws nyuaj rau kev paub. Kuv xav tias qhov no feem ntau yog qhov teeb meem, tab sis kuv tsis tuaj yeem hais dav dav. TOP nti ntawm PI tuam txhab tuaj yeem ncav cuag 300 watts. Muaj cov lus qhia txog lub flyback fais fab mov tuaj yeem ncav cuag ntau txhiab watts, tab sis kuv tsis tau pom qhov tseeb. Cov zis hluav taws xob muaj feem xyuam nrog cov zis voltage theem.
Qhov xau inductance ntawm flyback fais fab mov transformer yog qhov tseem ceeb heev. Txij li thaum lub flyback fais fab mov xav tau lub transformer los khaws lub zog, thiaj li yuav ua kom tag nrho cov transformer hlau core, ib tug huab cua sib txawv feem ntau yuav tsum tau nyob rau hauv lub magnetic Circuit Court. Lub hom phiaj yog los hloov lub hysteresis ntawm cov tub ntxhais hlau Qhov txoj kab nqes ntawm lub voj voog ua rau lub transformer tiv taus qhov cuam tshuam ntawm cov mem tes loj tam sim no yam tsis muaj cov tub ntxhais hlau nkag mus rau hauv lub xeev saturated nonlinear. Qhov sib txawv ntawm huab cua nyob rau hauv lub magnetic Circuit Court yog nyob rau hauv ib tug siab reluctance lub xeev, thiab cov magnetic flux to nyob rau hauv lub magnetic Circuit Court yog ntau dua li nyob rau hauv ib tug kiag li kaw magnetic Circuit Court. .
Kev sib txuas ntawm lub hauv paus ncej ntawm lub transformer kuj yog ib qho tseem ceeb hauv kev txiav txim siab qhov to ntawm inductance. Txhawm rau ua kom lub hauv paus ncej coils ze li sai tau, siv txoj kev sandwich winding, tab sis qhov no yuav ua rau kom muaj kev faib tawm ntawm transformer. Xaiv cov tub ntxhais hlau nrog lub qhov rais ntev npaum li qhov ua tau kom txo tau cov dej xau inductance. Piv txwv li, cov nyhuv ntawm kev siv EE, EF, EER, thiab PQ hom sib nqus cores zoo dua li ntawm EI hom.
Hais txog lub luag haujlwm lub voj voog ntawm flyback fais fab mov, nyob rau hauv lub hauv paus ntsiab lus lub siab tshaj plaws lub luag hauj lwm voj voog ntawm lub flyback fais fab mov yuav tsum tsawg tshaj li {{0}}.5, txwv tsis pub lub voj tsis yooj yim los them thiab tej zaum yuav tsis ruaj khov, tab sis muaj qee qhov kev zam, xws li TOP series chips launched los ntawm American PI lub tuam txhab Nws tuaj yeem ua haujlwm raws li lub luag haujlwm ntawm lub voj voog ntau dua 0.5. Lub voj voog lub luag haujlwm yog txiav txim siab los ntawm qhov sib piv ntawm thawj thiab theem nrab ntawm lub transformer. Kuv lub tswv yim ntawm kev ua flyback yog thawj zaug txiav txim siab qhov cuam tshuam qhov hluav taws xob (qhov tso zis hluav taws xob tau cuam tshuam rau tus nqi hluav taws xob ntawm thawj sab los ntawm kev sib txuas ntawm lub tshuab hluav taws xob), thiab qhov cuam tshuam qhov hluav taws xob nce nyob rau hauv qee qhov voltage ntau. Lub voj voog ua haujlwm tau nce ntxiv, thiab kev hloov lub raj poob yog txo. Raws li qhov cuam tshuam qhov hluav taws xob txo qis, lub voj voog ua haujlwm ua haujlwm txo qis, thiab qhov poob ntawm lub raj xa hluav taws xob nce. Tau kawg, qhov no kuj muaj qhov yuav tsum tau ua ua ntej. Thaum lub voj voog ua haujlwm nce, nws txhais tau hais tias lub sij hawm conduction ntawm cov zis diode yog luv. Txhawm rau kom cov zis ruaj khov, nws yuav raug lees paub los ntawm qhov tso tawm tam sim no ntawm cov zis capacitor ntau zaus, thiab cov zis capacitor yuav tiv taus ntau dua. Lub ripple tam sim no scours thiab ua kom sov, uas tsis tso cai nyob rau hauv ntau yam mob. Ua kom lub luag haujlwm lub voj voog thiab hloov qhov hloov pauv ntawm qhov hloov pauv yuav ua rau kom cov pa tawm ntawm lub tshuab hloov pauv thiab hloov nws qhov kev ua tau zoo tag nrho. Thaum lub zog xau inductance loj txaus rau ib qho twg, nws tuaj yeem ua rau qhov poob qis los ntawm lub luag haujlwm loj ntawm lub raj hloov. Tsis muaj qhov taw tes hauv kev nce lub voj voog ua haujlwm, thiab nws tseem tuaj yeem ua rau lub raj hloov pauv vim qhov siab hloov pauv siab siab ntawm cov xau inductance. Vim yog qhov loj heev inductance, cov zis ripple thiab lwm yam electromagnetic indicators, yuav deteriorated. Thaum lub voj voog ua haujlwm me me, qhov txiaj ntsig zoo ntawm qhov hloov raj tam sim no yog siab, thiab qhov txiaj ntsig zoo ntawm tus thawj tam sim no ntawm lub transformer loj, uas txo cov efficiency ntawm lub converter, tab sis tuaj yeem txhim kho cov kev ua haujlwm ntawm cov zis capacitor. thiab txo cov cua sov tsim.
Yuav ua li cas los txiav txim siab Transformer Reflected Voltage (ie Duty Cycle)
Qee cov netizens tau hais txog qhov teeb tsa thiab kev ua haujlwm raws li kev txheeb xyuas ntawm cov lus tawm tswv yim ntawm lub zog hloov hluav taws xob. Vim kuv txom nyem nyob rau hauv kev ua lej siab heev thaum kuv nyob hauv tsev kawm ntawv, kuv yuav luag yuav tsum tau xeem qhov kev xeem "Principles of Automatic Control". Kuv tseem ntshai cov ntsiab lus no, thiab kuv tsis tuaj yeem sau tag nrho cov haujlwm hloov pauv ntawm lub voj kaw kaw kom txog rau thaum tam sim no. Kuv xav txog lub tswvyim ntawm xoom thiab ncej ntawm qhov system. Nws yog qhov tsis meej, thiab saib ntawm daim duab Bode tsuas tuaj yeem qhia tau hais tias nws yog qhov sib txawv lossis sib koom ua ke, yog li kuv tsis xav hais lus tsis muaj tseeb txog kev tawm tswv yim, tab sis kuv muaj qee cov lus qhia. Yog tias koj muaj qee qhov kev txawj lej thiab qee lub sijhawm kawm, koj tuaj yeem nrhiav cov ntawv kawm hauv tsev kawm ntawv "Automatic Control Principles" thiab zom nws kom zoo, thiab muab sib xyaw nrog cov khoom siv hluav taws xob hloov hluav taws xob los soj ntsuam nws raws li kev ua haujlwm. Yeej yuav muaj tej yam kom tau. Muaj cov ntawv tshaj tawm ntawm lub rooj sab laj "Kev Kawm Ua Haujlwm thiab Kev Kawm Cov Lus Qhia Loop Tsim thiab Kho", uas CMG teb tau zoo heev, thiab kuv xav tias nws tuaj yeem siv los ua ib qho kev siv.
Niaj hnub no kuv yuav tham txog lub luag hauj lwm voj voog ntawm lub flyback fais fab mov (Kuv them sai sai rau lub reflected voltage, uas yog raws li nyob rau hauv lub luag hauj lwm voj voog). Lub voj voog lub luag haujlwm kuj tseem cuam tshuam nrog kev tiv thaiv hluav taws xob ntawm lub raj xaiv hloov. Qee cov khoom siv hluav taws xob thaum ntxov siv cov khoom siv hluav taws xob tsis tshua muaj zog. Tubes, xws li 600V lossis 650V raws li kev hloov cov raj rau AC 220V input fais fab, tej zaum yuav cuam tshuam rau cov txheej txheem tsim khoom thaum lub sijhawm ntawd. High withstand voltage tubes tsis yooj yim rau kev tsim, los yog tsawg withstand voltage raj muaj ntau tsim nyog conduction poob thiab switching yam ntxwv, zoo li cov kab no Lub reflected voltage yuav tsum tsis txhob siab dhau heev lawm, txwv tsis pub, nyob rau hauv thiaj li yuav ua rau lub switching tube ua hauj lwm nyob rau hauv ib tug muaj kev ruaj ntseg. , lub zog poob los ntawm kev nqus Circuit Court kuj tseem ceeb heev. Kev xyaum tau ua pov thawj tias qhov hluav taws xob ntawm 600V lub raj yuav tsum tsis pub tshaj 100V, thiab qhov cuam tshuam qhov hluav taws xob ntawm 650V lub raj yuav tsum tsis pub tshaj 120V. Thaum qhov hluav taws xob inductance ncov voltage tus nqi yog clamped ntawm 50V, lub raj tseem muaj qhov ua haujlwm ntawm 50V. Tam sim no vim yog kev txhim kho ntawm cov txheej txheem tsim khoom ntawm MOS raj, dav dav flyback fais fab mov txais 700V lossis 750V lossis txawm tias 800-900V hloov cov raj. Zoo li hom kab hluav taws xob zoo li no, qhov cuam tshuam qhov hluav taws xob ntawm qee qhov kev hloov pauv hloov nrog lub peev xwm tiv thaiv overvoltage muaj zog tuaj yeem ua kom siab dua. Qhov siab tshaj plaws qhov hluav taws xob yog qhov tsim nyog ntawm 150V, thiab kev ua tau zoo tag nrho tuaj yeem tau txais. Lub TOP nti ntawm PI lub tuam txhab pom zoo kom siv lub sijhawm hloov hluav taws xob tiv thaiv diode rau clamp rau 135V. Txawm li cas los xij, nws pawg thawj coj saib xyuas feem ntau muaj qhov cuam tshuam qhov hluav taws xob qis dua li tus nqi ntawm ib puag ncig 110V. Ob hom muaj pros thiab cons:
Thawj qeb: Tsis muaj zog tiv thaiv overvoltage muaj peev xwm, lub voj voog me me, thiab loj thawj mem tes tam sim no ntawm transformer. Qhov zoo: me me transformer to inductance, tsis tshua muaj hluav taws xob electromagnetic, siab ripple Performance index, me me hloov raj poob, conversion efficiency tsis tas yuav qis dua hom thib ob.
Qhov thib ob qeb: Qhov tsis zoo Qhov poob ntawm lub raj hloov pauv loj dua, qhov dej ntws tawm ntawm lub tshuab hloov pauv loj dua, thiab cov ripple yog qhov phem dua. Qhov zoo: muaj zog tiv thaiv overvoltage, lub voj voog loj dua, txo qis transformer, thiab ua haujlwm ntau dua.
