nūhou

I ko mākou honua maikaʻi, palekana, maikaʻi a me ka hana ka mea nui. I nā manawa he nui, akā naʻe, ua lilo ke kumukūʻai o ka mea hope, me ka ferrite, i mea hoʻoholo. koina.
Hoʻoholo ʻia nā waiwai intrinsic i makemake ʻia e kēlā me kēia noi kikoʻī. ʻO nā waiwai kūlohelohe e hoʻokele i ka hana ma nā noi haʻahaʻa haʻahaʻa haʻahaʻa he permeability (ʻoi aku ka mahana), nā poho kumu haʻahaʻa, a me ka paʻa magnetic maikaʻi i ka manawa a me ka mahana. Loaʻa nā noi kiʻekiʻe-Q inductors, inductor mode maʻamau, broadband, matched and pulse transformers, radio antenna elements, and active and passive repeaters. ka hoʻopiʻi ʻana i ka pākaukau kaʻa kaʻa, nā mea hoʻonui magnetic, nā mea hoʻololi DC-DC, nā kānana mana, nā wili puhi, a me nā mea hoʻololi.
ʻO ka waiwai intrinsic i loaʻa ka hopena nui loa i ka hana ferrite palupalu i nā noi suppression, ʻo ia ka paʻakikī permeability [1], i kūlike me ka impedance o ke kumu. ). ʻO ka mea mua, a me ka liʻiliʻi loa, ma ke ʻano he pale pono, kahi e hoʻohana ʻia ai nā ferrites e hoʻokaʻawale i nā conductors, nā ʻāpana a i ʻole nā ​​​​kaapuni mai ke kahua kahua electromagnetic radiating. kānana, ʻo ia hoʻi ka inductance – capacitive ma nā alapine haʻahaʻa a me ka dissipation ma nā alapine kiʻekiʻe. ʻO ke kolu a me ka hoʻohana maʻamau i ka wā e hoʻohana wale ʻia ai nā cores ferrite no nā alakaʻi ʻāpana a i ʻole nā ​​​​kaapuni papa. a i ʻole e hōʻemi i ka hōʻailona hōʻailona makemake ʻole a i ʻole ka hoʻouna ʻana i hiki ke hoʻolaha ma nā alakaʻi a i ʻole nā ​​​​pilina, nā ala a i ʻole nā ​​kaula. impedance alapine kiʻekiʻe e hoʻopau i nā au alapine kiʻekiʻe. Ma ke kumumanaʻo, hiki i kahi ferrite maikaʻi ke hāʻawi i ka impedance kiʻekiʻe ma nā alapine EMI a me ka zero impedance ma nā alapine ʻē aʻe. hiki ke loaʻa ka impedance kiʻekiʻe ma waena o 10 MHz a me 500 MHz ma muli o ka mea ferrite.
No ka mea ua kūlike ia me nā loina o ka ʻenekini uila, kahi e hōʻike ʻia ai ka volta AC a me ka manawa e nā ʻāpana paʻakikī, hiki ke hōʻike ʻia ka permeability o kahi mea ma ke ʻano he ʻāpana paʻakikī e pili ana i nā ʻāpana maoli a me ka noʻonoʻo. Ua māhele ʻia ka permeability i ʻelua mau ʻāpana. ʻO ka ʻāpana maoli (μ') e hōʻike ana i ka ʻāpana reactive, aia i loko o ka māhele me ke kahua magnetic alternating [2]. pākuʻi māneʻe.Hiki ke hōʻike ʻia kēia mau mea ma ke ʻano he ʻāpana moʻo (μs'μs") a i ʻole ma ka ʻāpana like (µp'µp").Hōʻike nā kiʻi ma nā Kiʻi 1, 2, a me 3 i nā ʻāpana moʻo o ka permeability mua paʻakikī ma ke ʻano he hana o ke alapine no nā mea ferrite ʻekolu.ʻO ka ʻano mea 73 he manganese-zinc ferrite, ka magnetic mua ʻO ka conductivity ʻo 2500. ʻO ke ʻano ʻano 43 he nickel zinc ferrite me ka permeability mua o 850. ʻO ke ʻano ʻano 61 kahi nickel zinc ferrite me ka permeability mua o 125.
Ke nānā aku nei i ka māhele moʻo o ka Type 61 mea i ka Figure 3, ʻike mākou i ka ʻāpana maoli o ka permeability, μs ', e mau ana me ka hoʻonui pinepine ʻana a hiki i kahi alapine koʻikoʻi, a laila emi wikiwiki. a laila piʻi ka piko i ka hāʻule ʻana o μs.ʻO kēia emi ʻana o nā μs ma muli o ka hoʻomaka ʻana o ka ferrimagnetic resonance.[3] Pono e hoʻomaopopo ʻia ʻo ke kiʻekiʻe o ka permeability, ʻoi aku ka nui ʻO ka haʻahaʻa haʻahaʻa.Ua ʻike mua ʻia kēia pilina inverse e Snoek a hāʻawi i kēia ʻano:
kahi: ƒres = μs” alapine (frequency) ma ka palena kiʻekiʻe γ = gyromagnetic ratio = 0.22 x 106 A-1 m μi = hiki mua Msat = 250-350 Am-1
Ma muli o ka hoʻohana ʻana o nā cores ferrite i ka pae haʻahaʻa haʻahaʻa a me nā noi mana i ka nānā ʻana i nā ʻāpana magnetic ma lalo o kēia alapine, ʻaʻole i paʻi pinepine nā mea hana ferrite i ka permeability a / a i ʻole nā ​​​​ʻikepili nalowale ma nā alapine kiʻekiʻe.
ʻO ka hiʻohiʻona a ka hapa nui o nā mea hana ferrite i kuhikuhi no nā ʻāpana i hoʻohana ʻia no ka hoʻopau ʻana i ka EMI ʻo ia ka impedance. He maʻalahi ke ana ʻana i ka impedance ma kahi mea hoʻopuka kūʻai kūʻai me ka heluhelu kikohoʻe pololei. impedance vector. ʻOiai he waiwai kēia ʻike, ʻaʻole lawa pinepine ia, ʻoi aku ka nui o ka hoʻohālikelike ʻana i ka hana kaapuni o nā ferrites.
Akā ma mua o ka hoʻomaka ʻana e hoʻohālike i ka hana o nā ʻāpana ferrite i kahi kaapuni, pono e ʻike nā mea hoʻolālā i kēia mau mea:
kahi μ'= ʻāpana maoli o ka paʻakikī paʻakikī μ”= ʻāpana noʻonoʻo o ka permeability paʻakikī j = vector noʻonoʻo o ka wae Lo= inductance kumu ea
ʻO ka impedance o ke kumu hao ka mea i manaʻo ʻia ʻo ia ka hui pū ʻana o ka reactance inductive (XL) a me ke kūpaʻa poho (Rs), ʻo ia mau mea ʻelua e pili pinepine ana.
kahi: Rs = huina kū'ē kū'ē = Rm + Re Rm = kū'ē kū'ē kū'ē kū'ē like ma muli o nā poho magnetic Re = kū'ē kū'ē kū'ē like no nā poho keleawe
Ma nā alapine haʻahaʻa, ʻo ka impedance o ka ʻāpana he inductive. I ka piʻi ʻana o ke alapine, emi ka inductance i ka wā e piʻi ai nā poho a piʻi ka impedance holoʻokoʻa. .
A laila ua like ka inductive reactance i ka ʻāpana maoli o ka paʻakikī paʻakikī, e Lo, ka inductance ea-core:
ʻO ke kūpaʻa pohō ʻana like pū me ka ʻāpana noʻonoʻo o ka paʻakikī paʻakikī e ka like mau:
Ma ka Equation 9, ua hāʻawi ʻia ka mea kumu e µs 'a me µs", a ua hāʻawi ʻia ka geometry kumu e Lo. ʻO ke alapine a i ʻole ke alapine. Ma hope o ke koho ʻana i ka mea maikaʻi loa, ʻo ia ka manawa e koho ai i nā ʻāpana nui maikaʻi loa. Hōʻike ʻia ka hōʻike vector o ka permeability paʻakikī a me ka impedance ma ke Kiʻi 5.
He mea maʻalahi ka hoʻohālikelike ʻana i nā ʻano kumu a me nā mea kumu no ka hoʻonui ʻana i ka impedance inā hāʻawi ka mea hana i ka pakuhi o ka paʻakikī paʻakikī me ka pinepine no nā mea ferrite i ʻōlelo ʻia no nā noi hoʻopau. curves. Mai kēia ʻikepili hiki ke loaʻa mai kahi hoʻohālikelike o nā mea i hoʻohana ʻia no ka hoʻonui ʻana i ka impedance kumu.
E pili ana i ka Figure 6, ka mua permeability a me ka dissipation factor [4] o Fair-Rite 73 material versus frequency, me ka manaʻo o ka mea hoʻolālā makemake e hōʻoia i ka impedance kiʻekiʻe ma waena o 100 a me 900 kHz.73 mau mea i koho ʻia. Pono e hoʻomaopopo i nā ʻāpana reactive a me ka resistive o ka impedance vector ma 100 kHz (105 Hz) a me 900 kHz. Hiki ke loaʻa kēia ʻike mai ka pakuhi aʻe:
Ma 100kHz μs ' = μi = 2500 a me (Tan δ / μi) = 7 x 10-6 no ka mea Tan δ = μs ”/ μs' a laila μs” = (Tan δ / μi) x (μi) 2 = 43.8
Pono e hoʻomaopopo ʻia, e like me ka mea i manaʻo ʻia, hoʻohui liʻiliʻi ka μ" i ka huina permeability vector ma kēia alapine haʻahaʻa.ʻO ka impedance o ke kumu ka hapa nui o ka inductive.
Ua ʻike nā mea hoʻolālā he pono ke ʻae ke kumu i ka uea #22 a komo i loko o kahi ākea 10 mm x 5 mm. E kuhikuhi ʻia ke anawaena o loko he 0.8 mm. 10 mm a me ke kiʻekiʻe o 5 mm:
Z= ωLo (2500.38) = (6.28 x 105) x .0461 x log10 (5/.8) x 10 x (2500.38) x 10-8= 5.76 ohm ma 100 kHz
I kēia hihia, e like me ka nui o nā hihia, loaʻa ka impedance kiʻekiʻe ma o ka hoʻohana ʻana i kahi OD liʻiliʻi me ka lōʻihi lōʻihi.
Hiki ke hoʻohana ʻia ke ala like inā hāʻawi ʻia nā ʻāpana o ka impedance no kēlā me kēia ʻāpana Lo a me ka huina ʻāpana me ke alapine.
Makemake nā mea hoʻolālā e hōʻoia i ka impedance kiʻekiʻe ma luna o ka 25 MHz a hiki i ka 100 MHz frequency range. ʻO ka nui o ka papa i loaʻa hou he 10mm x 5mm a pono ke kumu e ʻae i ka uea #22 awg. E pili ana i ke Kiʻi 7 no ka hui impedance Lo o nā mea ferrite ʻekolu, a i ʻole Helu 8 no ka paʻakikī paʻakikī o nā mea like ʻekolu, koho i ka mea 850 μi.[5]Ke hoʻohana nei i ka pakuhi ma ke Kiʻi 9, ʻo ka Z/Lo o ka mea paʻa waena he 350 x 108 ohm/H ma 25 MHz. E hoʻoholo no ka impedance i manaʻo ʻia:
Manaʻo ka kūkākūkā mua ʻana he cylindrical ke kumu o ka koho. e helu i ka ea kumu inductance . Hiki ke hana i keia ma ka makemakika slicing i ke kumu a me ka hoonui ana i ke ala i helu 'ia a me ka wahi magnetic no kela a me keia apana. ke kiʻekiʻe/lōʻihi o ke kumu ferrite.[6]
E like me ka mea i ʻōlelo ʻia, ʻo ka hapa nui o nā mea hana e kuhikuhi i nā cores no nā noi EMI ma ke ʻano o ka impedance, akā pono ka mea hoʻohana hope e ʻike i ka attenuation. ʻO ka pilina ma waena o kēia mau ʻāpana ʻelua:
Pili kēia pilina i ka impedance o ke kumu e hoʻopuka ai i ka walaʻau a me ka impedance o ka ukana e loaʻa ana ka walaʻau. 1 ohm no ka haawe a me ke kumu impedances, hiki ke hana i ka wā e hoʻololi ai ke kumu i ka mana a hoʻouka i nā kaʻa kaʻa haʻahaʻa haʻahaʻa, hoʻomaʻamaʻa i nā hoʻohālikelike a hiki ke hoʻohālikelike i ka attenuation o nā cores ferrite.
ʻO ka pakuhi i ka Figure 12 he pūʻulu o nā pihi e hōʻike ana i ka pilina ma waena o ka pale bead impedance a me ka attenuation no nā waiwai maʻamau o ka ukana a me ka impedance generator.
He kaapuni like ia o ke kumu hoopilikia me ka pale kuloko o Zs.Hoʻokumu ʻia ka hōʻailona interference e ka series impedance Zsc o ka suppressor core a me ka load impedance ZL.
ʻO nā kiʻi 14 a me 15 nā kiʻi o ka impedance versus ka mahana no nā mea ferrite ʻekolu. % hāʻule i ka impedance i ka like frequency a me ka mahana. ʻO kēia mau pihi, ke hāʻawi ʻia, hiki ke hoʻohana ʻia e hoʻoponopono i ka impedance wela o ka lumi i ʻōlelo ʻia inā makemake ʻia ka attenuation ma nā mahana kiʻekiʻe.
E like me ka mahana, DC a me 50 a i ʻole 60 Hz hāʻawi au i hoʻopili ʻia i nā waiwai ferrite like ʻole, a laila e hopena i ka impedance kumu haʻahaʻa. .Ke wehewehe nei kēia kuʻekuʻe i ka hoʻohaʻahaʻa impedance ma ke ʻano he hana o ka ikaika o ke kahua no kekahi mea ma ke ʻano he hana o ka pinepine.
Ma muli o ka hōʻuluʻuluʻiaʻana o kēiaʻikepili, ua hoʻokomoʻo Fair-Rite Products iʻelua mau mea hou.ʻO kā mākou 44 he mea nickel-zinc medium permeability material aʻo kā mākou 31 he manganese-zinc high permeability material.
He kiʻi 19 kahi pānaʻi o ka impedance versus frequency no nā beads o ka nui like i nā mea 31, 73, 44 a me 43. ʻO ka mea 44 he mea i hoʻomaikaʻi ʻia 43 me ka DC resistivity kiʻekiʻe, 109 ohm cm, ʻoi aku ka maikaʻi o nā waiwai haʻalulu wela, paʻa ka mahana a me kiʻekiʻe Curie mahana (Tc). ʻO ka mea 44 ka mea i ʻoi aku ka kiʻekiʻe o ka impedance versus frequency hiʻohiʻona i hoʻohālikelike ʻia me kā mākou mea 43. ʻO ka mea paʻa 31 e hōʻike ana i kahi impedance kiʻekiʻe aʻe ma mua o 43 a i ʻole 44 ma luna o ke ana holoʻokoʻa holoʻokoʻa. ʻO ka pilikia resonance e pili ana i ka hana haʻahaʻa haʻahaʻa haʻahaʻa o ka nui manganese-zinc cores a ua hoʻohana maikaʻi ʻia i nā cores suppression connector cables a me nā cores toroidal nui. -Rite cores me 0.562″ OD, 0.250 ID, a me 1.125 HT.I ka hoʻohālikelike ʻana i ka Helu 19 a me ka Helu 20, pono e hoʻomaopopo ʻia no nā cores liʻiliʻi, no nā alapine a hiki i 25 MHz, ʻo 73 ka mea ʻoi loa ka mea suppressor.Eia naʻe, i ka piʻi ʻana o ka pauku keʻa koʻikoʻi, e emi ana ka alapine kiʻekiʻe.E like me ka mea i hōʻike ʻia ma ka ʻikepili i ka Figure 20, ʻo 73 ka mea maikaʻi ʻO ke alapine kiʻekiʻe ʻo 8 MHz.He mea kūpono hoʻi e hoʻomaopopo i ka hana maikaʻi ʻana o ka mea 31 i ka pae alapine mai 8 MHz a i 300 MHz.Eia naʻe, ma ke ʻano he manganese zinc ferrite, ʻo ka mea 31 he haʻahaʻa haʻahaʻa haʻahaʻa haʻahaʻa o 102 ohms -cm, a ʻoi aku ka nui o nā hoʻololi impedance me nā loli wela loa.
ʻŌlelo Puʻupuʻu Air Core Inductance – Lo (H) ʻO ka inductance e ana ʻia inā loaʻa ke ʻano like ʻole o ke kumu a paʻa mau ka puʻunaue kahe. /ID) Ht 10-8 (H) Aia nā ana i ka mm
Attenuation - A (dB) ʻO ka hoʻemi ʻana i ka amplitude hōʻailona i ka hoʻouna ʻana mai kekahi wahi a i kekahi.
Core Constant – C1 (cm-1) Ka huina o ka lōʻihi o ke ala māke o kēlā me kēia ʻāpana o ke kaapuni mākēneki i puʻunaue ʻia e ka ʻāpana mākēneki e pili ana i ka ʻāpana like.
Core Constant – C2 (cm-3) Ka huina o ka loihi kaapuni makeke o kela a me keia pauku o ke kaapuni makeke i puunaueia e ka huinahalike o ka domain magnetic pili o ka pauku hookahi.
ʻO nā ana kūpono o ka ʻāpana ala magnetic Ae (cm2), ka lōʻihi o ke ala le (cm) a me ka leo Ve (cm3) No kahi geometry kumu i hāʻawi ʻia, ua manaʻo ʻia ʻo ka lōʻihi o ke ala magnetic, ka ʻāpana kea, a me ka leo o ʻO ke kumu toroidal nā mea waiwai like me ka mea pono ke loaʻa nā waiwai magnetic e like me ke kumu i hāʻawi ʻia.
Ka ikaika o ke kahua – H (Oersted) He ʻāpana e hōʻike ana i ka nui o ka ikaika kahua.H = .4 π NI/le (Oersted)
ʻO Flux Density - B (Gaussian) ʻO ka ʻāpana pili o ke kahua magnetic i hoʻokomo ʻia ma ka ʻāpana maʻamau i ke ala flux.
Impedance - Z (ohm) Hiki ke hōʻike ʻia ka impedance o kahi ferrite ma ke ʻano o kona paʻakikī paʻakikī.Z = jωLs + Rs = jωLo(μs'- jμs") (ohm)
ʻAha Nalo – ​​tan δ Ua like ka tangent poho o kahi ferrite me ka pānaʻi o ke kaapuni Q.
Ke Kumu Nalo – tan δ/μi Ka wehe ʻana i ka pae ma waena o nā ʻāpana kumu o ka mānoanoa flux magnetic a me ka ikaika kahua me ka permeability mua.
Magnetic Permeability - μ ʻO ka magnetic permeability i loaʻa mai ka ratio o ka mānoanoa o ka magnetic flux a me ka ikaika o ke kahua hoʻololi i hoʻohana ʻia…
Amplitude permeability, μa - ke ʻoi aku ka nui o ka waiwai i ʻōlelo ʻia o ka puʻuwai flux ma mua o ka waiwai i hoʻohana ʻia no ka permeability mua.
Pono Permeability, μe - Ke kūkulu ʻia ke ala hoʻokalakupua me hoʻokahi a ʻoi aʻe paha nā āpau ea, ʻo ka permeability ka permeability o kahi mea homogeneous hypothetical e hāʻawi i ka makemake like.
ʻO In Compliance ke kumu mua o ka nūhou, ka ʻike, ka hoʻonaʻauao a me ka hoʻoikaika ʻana no nā ʻoihana ʻenehana uila a me ka uila.
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