Passive sefa, inozivikanwawo seLC sefa, sefa yedunhu inoumbwa neiyo inductance, capacitance uye kuramba, inogona kusefa kunze imwe kana anopfuura harmonics. Iyo yakajairika uye iri nyore kushandisa passive sefa chimiro ndeyekubatanidza iyo inductance uye capacitance munhevedzano, iyo inogona kuumba yakaderera impedance bypass yeiyo huru harmonics (3, 5 uye 7); Single tuned sefa, kaviri tuned sefa uye yakakwirira pass filter ese ari passive mafirita.
advantage
Passive sefa ine zvakanakira chimiro chakareruka, mutengo wakaderera, kuvimbika kwekushanda kwakanyanya uye mutengo wakaderera wekushanda. Ichiri kushandiswa zvakanyanya senzira yekutonga ye harmonic.
classification
Hunhu hweLC sefa huchasangana nezvakatsanangurwa tekinoroji index zvinodiwa. Izvi zvinodiwa zvehunyanzvi zvinowanzo shanda attenuation mu frequency domain, kana phase shift, kana zvese; Dzimwe nguva, nguva yekupindura zvinodiwa mutime domain inokurudzirwa. Passive mafirita anogona kukamurwa kuita mapoka maviri: tuned mafirita uye yakakwirira pass mafirita. Panguva imwecheteyo, maererano nenzira dzakasiyana dzekugadzira, inogona kukamurwa kuva mufananidzo weparameter filter uye kushanda parameter filter.
Tuning sefa
Iyo tuning sefa inosanganisira imwechete tuning sefa uye kaviri tuning sefa, iyo inogona kusefa kunze imwe (kamwe tuning) kana maviri (kaviri tuning) harmonics. Kuwanda kwemaharmonics kunonzi resonant frequency yetuning filter.
High pass filter
High pass filter, inozivikanwawo seamplitude reduction filter, inonyanya kusanganisira yekutanga-yepamusoro-yepamusoro pasefa, yechipiri-yechipiri-yepamusoro-soro sefa, yechitatu-yechitatu-yepamusoro-soro sefa uye C-mhando sefa, ayo anoshandiswa zvakanyanya kudzikamisa maharmonics akaderera pane imwe frequency, iyo inodaidzwa kuti kucheka-kudzima frequency yeyakakwira pass sefa.
Image parameter sefa
Iyo sefa inogadzirwa uye inoshandiswa zvichienderana nedzidziso yemifananidzo paramita. Iyi sefa inoumbwa akati wandei ekutanga zvikamu (kana hafu zvikamu) cascaded zvinoenderana nemusimboti wekuenzana kwemufananidzo impedance pakubatana. Chikamu chekutanga chinogona kukamurwa kuita yakagadziriswa K-mhando uye m-yakatorwa mhando zvichienderana nedunhu redunhu. Kutora LC yakaderera-pass sefa semuenzaniso, iyo stopband attenuation yeiyo yakagadziriswa K-mhando yakaderera-pass basic chikamu inowedzera monotonically nekuwedzera kwema frequency; Iyo m-inotorwa yakaderera-pass basic node ine attenuation peak pane imwe frequency mune yekumisa bhendi, uye chinzvimbo chepamusoro peak chinodzorwa nem kukosha mune m-inotorwa node. Kune yakaderera-pass sefa inoumbwa neCascaded Low-Pass basic zvikamu, iyo inherent attenuation yakaenzana nehuwandu hwekuyeredzwa kwemukati kwechikamu chimwe nechimwe chakakosha. Kana iyo yemukati impedance uye mutoro wemagetsi emagetsi akamiswa kumativi ese esefa akaenzana neiyo impedance yemufananidzo pamigumo yese, iyo yekushanda attenuation uye chikamu chekuchinja kwesefa zvakaenzana nekwavo kwekuzvarwa uye kuchinja kwechikamu zvichiteerana. (a) Iyo sefa inoratidzwa inoumbwa neyakagadziriswa K chikamu uye maviri m akatorwa zvikamu mu cascade. Z π uye Z π m ndiwo mufananidzo impedance. (b) Ndiyo attenuation frequency hunhu. Nzvimbo dzemapikisi maviri ekudzikisira /f ∞ 1 uye f ∞ 2 mubhendi yekumira zvinotemerwa nem kukosha kwema maviri akatorwa node.
Saizvozvo, yakakwirira pass, bhendi-pass uye bhendi yekumisa mafirita anogona zvakare kuumbwa anoenderana zvikamu zvakakosha.
Iyo impedance yemufananidzo wesefa haigone kuenzana neyakachena inopikisa yemukati kuramba kwesimba rekupa uye kurodha impedance muyese frequency bhendi (musiyano wakakura mune yekumira), uye iyo inherent attenuation uye kushanda attenuation zvakasiyana zvakanyanya mupassband. Kuti uve nechokwadi chekuzadzikiswa kwezviratidzo zvehunyanzvi, zvinowanzodikanwa kuchengetedza yakakwana inherent attenuation margin uye kuwedzera upamhi hwepassband mudhizaini.
Inoshanda parameter sefa
Iyi sefa haina kuumbwa necascaded basic sections, asi inoshandisa network mabasa ayo anogona kucherechedzwa neR, l, C uye mutual inductance zvinhu kuti zvinyatso fungira tekinoroji yefirita, uye wobva waziva inoenderana sefa yedunhu neakawanikwa network mabasa. Zvinoenderana neakasiyana ekufungidzira maitiro, akasiyana network mabasa anogona kuwanikwa, uye akasiyana marudzi emafirita anogona kuitika. (a) Ndiwo hunhu hweiyo yakaderera-pass sefa inoonekwa neiyo flattest amplitude approximation (bertowitz approximation); Iyo passband ndiyo yakanyanya kufuratira padyo ne zero frequency, uye iyo attenuation inowedzera monotonically kana yasvika pakumira. (c) Hunhu hwepasi-pasi sefa rinowanikwa neakaenzana ripple approximation (Chebyshev approximation); Iyo yekudzikisira mupassband inoshanduka pakati zero uye yepamusoro muganho, uye inowedzera monotonically mubhendi yekumira. (e) Inoshandisa elliptic function approximation kuona hunhu hweyakaderera-pass sefa, uye iyo attenuation inopa inogara ichichinja voltage mune ese ari maviri bhendi uye yekumisa bhendi. (g) Hunhu hweiyo low-pass sefa inoonekwa na; Kudzikira mupassband kunochinja-chinja muamplitude yakaenzana, uye kudzikisira mubhandi rekumira kunochinja zvichienderana nekukwira nekudonha kunodiwa neindex. (b) , (d), (f) uye (H) ndiwo masekete anofambirana emasefa aya epasi-pasi zvakateerana.
High pass, bhendi-pass uye bhendi stop mafirita anowanzo torwa kubva kupasi-pasi mafirita nenzira ye frequency shanduko.
Iyo inoshanda parameter sefa inogadzirwa neiyo synthesis nzira nenzira kwayo zvinoenderana nezvinodiwa zvehunyanzvi zviratidzo, uye inogona kuwana sefa redunhu nekuita kwakanaka uye hupfumi,
LC sefa iri nyore kugadzira, yakaderera mumutengo, yakafara mufrequency bhendi, uye inoshandiswa zvakanyanya mukukurukurirana, zviridzwa uye mamwe minda; Panguva imwecheteyo, inowanzoshandiswa seyekugadzira prototype yemamwe marudzi mazhinji emafirita.
Isu tinogona zvakare kugadzirisa iyo rf passive zvikamu zvinoenderana nezvaunoda. Iwe unogona kupinda peji rekugadzirisa kuti upe zvakatemwa zvaunoda.
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Nguva yekutumira: Jun-06-2022
