1. Txheej txheem cej luam ntawm Switching Power Supply
Switching fais fab movyog lub tshuab hluav taws xob hloov hluav taws xob ntau zaus, tseem hu ua hloov hluav taws xob hloov lossis hloov hloov pauv. Nws hloov cov input voltage mus rau hauv high-frequency mem tes teeb liab los ntawm ib tug high-ceev switching raj, thiab ces converts lub zog hluav taws xob ntawm ib daim ntawv mus rau lwm yam los ntawm kev ua ntawmtransformer, rectifier circuit thiab filtering circuit, thiab thaum kawg tau txais qhov ruaj khov tsis tshua muaj DC voltage rau lub hwj chim mov.
Switching fais fab mov muaj qhov zoo ntawm kev ua haujlwm siab, kev ruaj ntseg zoo, me me, lub teeb yuag, muaj kev ntseeg siab, thiab tuaj yeem hloov kho rau ntau yam khoom siv hluav taws xob xav tau.
Hloov cov khoom siv hluav taws xob tau siv dav hauv ntau qhov chaw, suav nrog kev lag luam automation, kev sib txuas lus thiab lub zog tshiab. Hauv kev lag luam automation, hloov hluav taws xob muab kev txhawb zog ruaj khov rau ntau yam khoom siv automation kom ntseeg tau tias kev ua haujlwm zoo thiab ruaj khov ntawm cov khoom siv.
Hauv kev sib txuas lus, kev hloov hluav taws xob yog siv dav hauv chaw nres tsheb wireless, cov khoom siv hauv network, thiab lwm yam, kom ntseeg tau tias cov teeb liab kis tau zoo ntawm kev sib txuas lus thiab txhim kho kev sib txuas lus zoo. Hauv kev ua haujlwm ntawm lub zog tshiab, kev hloov hluav taws xob ua lub luag haujlwm tseem ceeb hauv lub hnub ci thiab cua tshuab hluav taws xob, pab kev siv lub zog tauj dua tshiab.
Switching fais fab mov yog kwv yees li ntawm plaub lub ntsiab Cheebtsam: input circuit, converter, tswj Circuit Court, thiab output circuit. Cov hauv qab no yog ib qho kev hloov pauv hluav taws xob schematic thaiv daim duab, kev paub nws yog ib qho tseem ceeb rau peb kom nkag siab txog lub zog hloov hluav taws xob.
2. Kev faib tawm ntawm cov khoom siv hluav taws xob hloov
Hloov cov khoom siv hluav taws xob tuaj yeem raug cais raws li cov qauv sib txawv. Cov hauv qab no yog ob peb txoj kev faib ua feem ntau:
1. Kev faib tawm los ntawm cov khoom siv hluav taws xob:
AC-DC hloov fais fab mov: hloov AC zog rau DC fais fab.
DC-DC hloov fais fab mov: hloov DC fais fab mus rau lwm qhov DC voltage.
2. Kev faib tawm los ntawm hom kev ua haujlwm:
Tib-kawg switching fais fab mov: tsuas muaj ib lub raj hloov, haum rau cov ntawv siv hluav taws xob tsawg.
Dual-ended switching fais fab mov: muaj ob lub raj hloov, haum rau kev siv hluav taws xob siab.
3. Classification los ntawm topology:
Raws li topology, nws tuaj yeem muab faib ua Buck, Boost, Buck-Boost, Flyback, Forward, Ob-Transistor Forward, Push-Pull, Ib Nrab Choj, Full Choj, thiab lwm yam. Cov kev faib tawm no tsuas yog ib feem ntawm lawv. Hloov cov khoom siv hluav taws xob kuj tuaj yeem muab faib ua ntau yam raws li lwm cov kev cai tshwj xeeb thiab kev siv.
Tom ntej no, peb yuav qhia txog Flyback thiab Forward uas nquag siv. Forward thiab flyback yog ob qhov sib txawv hloov hluav taws xob siv thev naus laus zis. Forward switching power supply yog hais txog lub zog hloov hluav taws xob uas siv rau pem hauv ntej high-frequency transformer kom cais lub zog sib txuas, thiab qhov sib txuas flyback switching fais fab mov yog flyback switching fais fab mov.
2.1 Forward switching power supply
Forward switching fais fab mov nyob rau hauv cov qauv yog complex, tab sis lub hwj chim tso zis ntau heev, haum rau 100W-300W switching fais fab mov, feem ntau yog siv nyob rau hauv tsawg-voltage, high-tam sim no switching fais fab mov, ntau lug siv.
Raws li pom nyob rau hauv daim duab hauv qab no, rau pem hauv ntej switching fais fab mov tshwj xeeb tshaj yog thaum lub switching tube yog qhib, lub tso zis transformer ua raws li ib tug nruab nrab ncaj qha txuas mus rau lub magnetic teb zog, hluav taws xob zog thiab sib nqus zog yog hloov dua siab tshiab rau ib leeg, thiaj li hais tias cov sib nqus teb zog, hluav taws xob thiab hluav taws xob sib nqus. input thiab output tib lub sijhawm.
Kuj tseem muaj qhov tsis zoo nyob rau hauv daim ntawv thov niaj hnub: xws li qhov yuav tsum tau ua kom rov qab muaj peev xwm winding (kom tiv thaiv cov transformer thawj kauj tsim los ntawm qhov rov qab muaj peev xwm mus rau lub raj hloov pauv), qhov thib ob ntau tshaj ib qho inductor rau lub zog cia lim, yog li. piv rau flyback switching fais fab mov, nws cov nqi yog siab dua, thiab rau pem hauv ntej switching fais fab mov transformer ntim tshaj qhov ntim ntawm flyback switching fais fab mov transformer yog loj.
Forward switching fais fab mov
2.2 Flyback switching fais fab mov
Raws li pom hauv daim duab hauv qab no, flyback switching fais fab mov yog hais txog lub zog hloov hluav taws xob uas siv flyback high-frequency transformer los cais cov tswv yim thiab cov khoom siv hluav taws xob. Nws transformer tsis tsuas yog plays lub luag hauj lwm ntawm converting voltage rau xa lub zog, tab sis kuj plays lub luag hauj lwm ntawm lub zog cia inductor. Yog li ntawd, lub flyback transformer zoo ib yam li tus tsim ntawm inductor. Tag nrho cov circuits yog qhov yooj yim thiab yooj yim los tswj. Flyback yog dav siv hauv kev siv hluav taws xob tsawg ntawm 5W-100W.
Rau lub flyback switching fais fab mov, thaum lub hloov raj yog qhib, tam sim no ntawm thawj inductor ntawm lub transformer nce. Txij li cov zis coil ntawm flyback Circuit Court muaj qhov sib txawv, cov zis diode raug muab tua, lub transformer khaws lub zog, thiab lub load yog nkag nrog lub zog los ntawm cov zis capacitor. Thaum lub qhov hluav taws xob hloov hluav taws xob raug kaw, qhov hluav taws xob inductive ntawm thawj inductor ntawm lub transformer yog thim rov qab. Lub sijhawm no, cov zis diode tau qhib, thiab lub zog ntawm lub transformer yog nkag mus rau lub load los ntawm diode, thaum them lub capacitor.
Flyback switching fais fab mov
Los ntawm kev sib piv, nws tuaj yeem pom tau tias lub tshuab hluav taws xob ntawm qhov kev txhawb siab rau pem hauv ntej tsuas yog muaj kev ua haujlwm ntawm transformer, thiab tag nrho tuaj yeem suav tau tias yog puck circuit nrog transformer. Flyback transformer tuaj yeem suav tau tias yog ib qho inductor nrog lub tshuab ua haujlwm, yog ib qho khoom siv hluav taws xob. Feem ntau, lub hauv paus ntsiab lus ntawm kev ua hauj lwm flyback yog txawv, pem hauv ntej yog thawj ua hauj lwm theem nrab ua hauj lwm, lub thib ob tsis ua hauj lwm nrog ib tug tam sim no inductor mus txuas ntxiv rau tam sim no, feem ntau CCM hom.
Lub zog qhov tseem ceeb feem ntau tsis siab, thiab qhov kev tawm tswv yim thiab cov zis thiab lub voj voog ua haujlwm sib txawv yog proportional. Flyback yog thawj txoj haujlwm, qhov thib ob tsis ua haujlwm, ob sab ntawm nws tus kheej, feem ntau DCM hom, tab sis qhov inductance ntawm transformer yuav me me, thiab qhov yuav tsum tau ntxiv qhov sib txawv ntawm huab cua, yog li feem ntau haum rau me me thiab nruab nrab lub zog.
Forward transformer yog qhov zoo tagnrho, tsis muaj lub zog cia, tab sis vim hais tias qhov excitation inductance yog tus nqi tsis kawg, qhov excitation tam sim no ua rau cov tub ntxhais yuav loj, txhawm rau kom tsis txhob muaj dej txaus, lub transformer xav tau kev pab winding rau flux reset.
Flyback transformer tuaj yeem pom tau tias yog ib daim ntawv ntawm kev sib txuas inductance, inductance thawj lub zog cia thiab tom qab ntawd tawm, vim yog lub flyback transformer cov tswv yim thiab cov zis voltages opposite polarity, yog li thaum lub raj hloov pauv tau raug txiav, qhov thib ob tuaj yeem muab cov khoom siv hluav taws xob.magnetic tub ntxhaisnrog rau qhov pib dua voltage, thiab yog li lub flyback transformer tsis tas yuav ntxiv flux rov pib dua winding.
Post lub sij hawm: Sep-29-2024