Koj puas paub vim li cas koj thiaj li yuav tsum tau ntxiv ib lub nplhaib sib nqus ntawm Lub Hwj Chim Fais Fab?

Ntau tus neeg tsis paub vim li cas qee cov xov hlau hluav taws xob hnav lub nplhaib sib nqus? Nws lub luag haujlwm tseem ceeb yog lim thiab txwv EMC:

※ Thaum lub inductor tsis tuaj yeem siv rau qhov siab zaus, kuv yuav ua li cas? Kev siv cov hlaws ferrite lossis cov nplhaib sib nqus yog cov ferrite lossis hlau-nickel alloy, uas muaj qhov siab permeability siab thiab siab zaus impedance, thiab lub peev xwm ntawm cov cua cua yog tsawg heev. Ferrite hlaws dai feem ntau yog siv nyob rau hauv high-frequency zaus, ntawm tsawg zaus, inductance yog me me, cov kab poob yog me me, nyob rau hauv high zaus, nws yog ib txwm reactive, thiab zaus-nyob ntawm seb, qhov tseeb, ferrite hlaws dai yog RF (xov tooj cua zaus. ) lub zog attenuators.

Ferrite magnetic cov ntaub ntawv yog tsim los ntawm manganese, npib tsib xee, zinc, tooj liab thiab lwm yam alloys, thiab nws lub ntsiab feature yog hais tias lub resistivity yog ntau npaum li cas ntawm cov hlau magnetic cov ntaub ntawv, uas inhibits tiam ntawm eddy tam sim no. Cov khoom sintered ferrite yog machined kom tau qhov ntev ntawm cov khoom tiav. Raws li qhov sib txawv siv ntau zaus, ferrite muab faib ua nruab nrab thiab qis zaus bands (20 ~ 150khz), nruab nrab thiab siab zaus bands (100 ~ 500khz) thiab ultra-high zaus bands (500khz ~ 1mhz).

Qhov tseeb, cov hlaws ferrite tau piav qhia zoo dua los ntawm kev sib txuas ntawm inductance thiab tsis kam. Ntawm qhov tsawg zaus, cov inductor luv luv ntawm cov resistor, thiab ntawm cov frequencies siab, inductive reactance siab heev uas tam sim no tsuas yog ntws los ntawm tus resistor. Qhov siab dua qhov permeability ntawm cov khoom ferrite, qhov ntau dua qhov tsawg-frequency impedance thiab me dua qhov siab-frequency kuj. Tsis tas li ntawd, cov ntaub ntawv ferrite nrog cov permeability siab muaj qhov dielectric ntau dua, thiab thaum tus neeg xyuas pib dhau los, muaj cov kab mob loj heev uas muaj peev xwm ua tau, uas kuj txo cov impedance siab.

Qhov loj ntawm lub nplhaib ferrite yog txiav txim siab: qhov ntau dua qhov sib txawv ntawm lub puab thiab sab nraud diameters ntawm lub nplhaib sib nqus, qhov ntev ntawm axial kev taw qhia, thiab qhov ntau dua qhov impedance. Tab sis sab hauv txoj kab uas hla yuav tsum nruj nreem qhwv ib ncig ntawm cov hlau. Yog li ntawd, kom tau txais ib tug loj attenuation, ib tug loj sib nqus nplhaib yuav tsum tau siv ntau li ntau tau.

Tus naj npawb ntawm kev sib hloov ntawm hom choke: Ntau qhov kev hloov pauv ntawm lub nplhaib tuaj yeem ua rau cov impedance ntawm cov zaus tsawg, tab sis vim yog qhov nce hauv parasitic capacitance, lub siab zaus impedance txo, yog li blindly nce tus naj npawb ntawm tig mus rau. nce tus nqi ntawm attenuation yog ib qho yuam kev. Thaum qhov cuam tshuam zaus band yuav tsum tau ua kom dav, qhov sib txawv tuaj yeem raug mob ntawm ob lub nplhaib sib nqus.

Ferrite hlaws dai yog cais raws li "cov khoom siv hluav taws xob". Nws siv lub zog ntau zaus hauv daim ntawv ntawm tshav kub. Qhov no tsuas yog piav qhia los ntawm cov yam ntxwv ntawm qhov tsis kam thiab tsis yog qhov inductance.

※ Lub hwj chim kab sib nqus nplhaib yog ib qho kev siv los tiv thaiv kev cuam tshuam hauv cov hluav taws xob hluav taws xob, thiab muaj kev cuam tshuam zoo rau lub suab nrov nrov.

Lub nplhaib sib nqus ntawm cov kab hluav taws xob yog lub nplhaib sib nqus uas feem ntau pom ntawm ib lossis ob qho kawg ntawm cov kab hluav taws xob lossis cov teeb liab kab ntawm cov khoom siv hluav taws xob. Lub zog hluav taws xob sib nqus nplhaib tuaj yeem tsim qhov cuam tshuam loj rau qhov sib txawv-hom cuam tshuam tam sim no, tab sis tsis muaj kev cuam tshuam rau qhov sib txawv-hom teeb liab (lub teeb liab kev khiav hauj lwm yog lub teeb liab txawv-hom teeb liab), yog li nws yooj yim rau siv yam tsis xav txog teeb liab distortion. . Thiab lub hwj chim qaum hlau nplaum tsis tas yuav tsum tau grounded, thiab tuaj yeem muab ntxiv ncaj qha rau cable.

Lub hwj chim kab sib nqus lub nplhaib daws qhov teeb meem ntawm kev cuam tshuam ntau zaus ntawm cov kab hluav taws xob, cov kab teeb liab thiab cov khoom sib txuas, thiab muaj ntau yam zoo xws li kev siv yooj yim, yooj yim, zoo, thiab tsis nyob ntau qhov chaw, thiab siv ferrite los tiv thaiv. Kev cuam tshuam cores los tiv thaiv electromagnetic cuam tshuam (EMI) yog ib qho kev lag luam, yooj yim thiab siv tau zoo, thiab tau siv dav hauv ntau yam tub rog lossis pej xeem cov khoom siv hluav taws xob xws li khoos phis tawj.

Vim muaj qee qhov laj thawj, xws li muag muag los yog hluav taws xob zoo li qub, yuav muaj hluav taws xob loj sib txawv ntawm tus tswv tsev thiab lub zog hluav taws xob, thiab qhov sib txawv ntawm qhov hluav taws xob no yuav ua rau muaj qhov cuam tshuam loj heev thaum lub sijhawm ntsaws, thiab nws yuav yooj yim tawg. nqes cov khoom. Lub nplhaib sib nqus no tuaj yeem tiv thaiv qhov tam sim no impulse tam sim no, kom cov hluav taws xob zoo li qub tuaj yeem tso tawm maj mam. Thaum lub plugging tiav thiab cov khoom siv hluav taws xob ntawm ob qho kawg ntawm lub cable zoo ib yam, lub nplhaib electromagnetic no tsis muaj txiaj ntsig.