ozi

N'ụwa anyị dị mma, nchekwa, ịdị mma na arụmọrụ dị oke mkpa. N'ọtụtụ ọnọdụ, Otú ọ dị, ọnụ ahịa nke akụkụ ikpeazụ, gụnyere ferrite, aghọwo ihe na-ekpebi ihe. ọnụ ahịa.
A na-ekpebi ihe ndị a chọrọ n'ime ihe onwunwe na isi geometry site na ngwa ọ bụla akọwapụtara. Ihe ndị na-emepụta ihe na-achịkwa arụmọrụ na ngwa ọkwa ọkwa dị ala bụ permeability (karịsịa okpomọkụ), obere ihe efu efu, na ezigbo nkwụsi ike magnetik na oge na okpomọkụ. Ngwa gụnyere elu-Q inductors, nkịtị mode inductors, brọdband, dakọtara na pulse transformers, redio antenna element, na arụ ọrụ na-agafe agafe repeaters.N'ihi na ike ngwa, elu flux njupụta na ala ọnwụ na-arụ ọrụ ugboro na okpomọkụ bụ na-achọsi ike character.Applications gụnyere mgba ọkụ-mode ike onunu maka. Ịchaji batrị ụgbọ ala eletrik, ihe ndọta magnetik, ndị na-atụgharị DC-DC, ihe nzacha ọkụ, mkpuchi ọkụ, na ihe ntụgharị.
Ihe dị n'ime ihe onwunwe nke nwere mmetụta dị ukwuu na arụmọrụ ferrite dị nro na ngwa nkwụsịtụ bụ mgbagwoju anya [1], nke kwekọrọ na mgbochi nke isi. E nwere ụzọ atọ iji ferrite dị ka onye na-egbochi mgbaàmà ndị na-achọghị (emere ma ọ bụ na-egbuke egbuke). .Nke mbụ, na ọ dịghị ihe ọzọ nkịtị, dị ka ihe ọta bara uru, ebe a na-eji ferrite kewapụ ndị na-eduzi, components ma ọ bụ sekit site na gburugburu ebe obibi electromagnetic na-egbukepụ egbukepụ. Na ngwa nke abụọ, a na-eji ferrite na ihe capacitive eme ihe iji mepụta obere ngafe dị ala. filter, ie inductance - capacitive na obere frequencies na dissipation na elu frequencies. Nke atọ na nke a na-ejikarị eme ihe bụ mgbe a na-eji cores ferrite naanị maka ihe ndị na-eduga ma ọ bụ sekit-ọkwa osisi. Na ngwa a, isi ferrite na-egbochi oscillations parasitic ọ bụla na / ma ọ bụ attenuates na-achọghị mgbaama pickup ma ọ bụ nnyefe nke nwere ike ịgbasa n'akụkụ components ma ọ bụ njikọ njikọ, traces ma ọ bụ cables.N'ime nke abụọ na nke atọ, ferrite cores na-egbochi EMI emeziri site n'iwepụ ma ọ bụ nke ukwuu ibelata ugboro ugboro ugboro ugboro nke EMI isi mmalite.Mwebata nke ferrite na-enye. N'echiche, ferrite dị mma ga-enye ihe mgbochi dị elu na EMI frequencies na efu impedance na ihe ọ bụla ọzọ. Enwere ike nweta ihe mgbochi kachasị n'etiti 10 MHz na 500 MHz dabere na ihe ferrite.
Ebe ọ bụ na ọ dabara na ụkpụrụ nke injinịa eletriki, ebe voltaji AC na ugbu a na-anọchi anya paramita dị mgbagwoju anya, enwere ike ịkọwapụta permeability nke ihe dị ka ihe mgbagwoju anya nke nwere akụkụ dị adị na nke a na-eche n'echiche. A na-egosipụta nke a n'ogo dị elu, ebe permeability na-ekewa ụzọ abụọ. Akụkụ ahụ n'ezie (μ') na-anọchi anya akụkụ ahụ na-emeghachi omume, nke dị na mpaghara magnetik ọzọ [2], ebe akụkụ nke echiche (μ") na-anọchi anya mfu, bụ nke na-apụ apụ na mpaghara ahụ. oghere ndọta ọzọ. Enwere ike ịkọwa ihe ndị a dị ka akụkụ usoro (μs'μs") ma ọ bụ n'otu akụkụ (µp'µp"). Eserese ndị dị na eserese 1, 2, na 3 na-egosi usoro akụkụ nke mgbagwoju anya mmalite mmalite dị ka ọrụ nke ugboro ole maka ihe atọ ferrite. Ụdị ihe onwunwe 73 bụ manganese-zinc ferrite, mmalite magnetik The conductivity bụ 2500. Ihe onwunwe ụdị 43 bụ a nickel zinc ferrite na mbụ permeability nke 850. Ihe onwunwe ụdị 61 bụ a nickel zinc ferrite na mbụ permeability nke 125.
N'ilekwasị anya na usoro ihe omume nke ụdị 61 ihe dị na Figure 3, anyị na-ahụ na ezigbo akụkụ nke permeability, μs', na-anọgide na-adịgide adịgide na-abawanye ugboro ugboro ruo mgbe a na-erute ugboro dị egwu, wee na-ebelata ngwa ngwa. Ọnwụ ma ọ bụ μs" na-ebili. wee na-arị elu ka μs' dara. Mbelata a na μs bụ n'ihi mmalite nke resonance ferrimagnetic. [3] Ekwesiri iburu n'uche na ka elu nke permeability, ka ọ na-ebelata ugboro ole. Snoek buru ụzọ hụ mmekọrịta a na-agbanwe agbanwe wee nye usoro a:
ebe: ƒres = μs" ugboro na kacha γ = gyromagnetic ratio = 0.22 x 106 A-1 m μi = mmalite permeability Msat = 250-350 Am-1
Ebe ọ bụ na cores ferrite ejiri na ọkwa mgbama dị ala na ngwa ike na-elekwasị anya na parampat magnetik n'okpuru ugboro a, ndị na-emepụta ferrite anaghị ebipụta data permeability na/ma ọ bụ ọnwụ n'ogo dị elu. Otú ọ dị, data ugboro dị elu dị mkpa mgbe a na-akọwapụta cores ferrite maka nkwụsị EMI.
Ihe e ji mara ọtụtụ ndị na-emepụta ferrite na-akọwapụta maka ihe eji eme ihe maka nkwụsị EMI bụ impedance. A na-atụ ya ngwa ngwa na onye nyocha ahịa dị na ya na-agụ akwụkwọ dijitalụ kpọmkwem. impedance vector.Ọ bụ ezie na ozi a bara uru, ọ na-abụkarị ezughị ezu, karịsịa mgbe ị na-eme ka arụmọrụ sekit nke ferrites. Iji mezuo nke a, uru impedance na akụkụ akụkụ nke akụkụ ahụ, ma ọ bụ mgbagwoju anya nke ihe a kapịrị ọnụ, ga-adịrịrị.
Mana ọbụlagodi tupu ịmalite ịrụ ọrụ nke akụrụngwa ferrite na sekit, ndị na-emepụta kwesịrị ịma ihe ndị a:
ebe μ'= ezigbo akụkụ nke mgbagwoju anya permeability μ"= akụkụ echiche nke mgbagwoju anya permeability j = vector chepụtara nke unit Lo = ikuku isi inductance
A na-ahụtakwa ihe mgbochi nke isi ígwè dị ka usoro nchikota nke inductive reactance (XL) na nkwụsị ọnwụ (Rs), nke abụọ na-adabere ugboro ugboro. Isi ihe na-enweghị isi ga-enwe ihe mgbochi nke mmeghachi omume nyere:
ebe: Rs = ngụkọta usoro nguzogide = Rm + Re Rm = nkwụghachi usoro nkwụghachi ụgwọ n'ihi nhụsianya magnetik Re = nguzogide usoro maka mfu ọla kọpa
N'oge dị ala, ihe mgbochi nke akụrụngwa bụ isi inductive. Dị ka ugboro na-abawanye, inductance na-ebelata ka ọnwụ na-abawanye na ngụkọta mgbochi na-abawanye.N'ihe atụ 4 bụ a ahụkarị ibé nke XL, Rs na Z versus ugboro maka anyị ọkara permeability ihe. .
Mgbe ahụ, mmeghachi omume inductive na-adaba na akụkụ n'ezie nke permeability dị mgbagwoju anya, site na Lo, inductance nke ikuku-isi:
Nguzogide ọnwụ ahụ dịkwa nhata na akụkụ echiche nke mgbagwoju anya site n'otu oge ahụ:
Na nha nhata 9, a na-enye ihe ndị bụ isi site na µs' na µs", na geometry bụ isi bụ Lo. Ya mere, mgbe ịmara mgbagwoju anya nke permeability nke ferrite dị iche iche, enwere ike iji tụnyere iji nweta ihe kachasị mma na nke a chọrọ. ugboro ugboro ma ọ bụ ugboro ugboro. Mgbe ị na-ahọrọ ihe kasị mma, ọ bụ oge na-ahọrọ ndị kasị mma size components.A na-egosi vector nnọchiteanya nke mgbagwoju permeability na impedance na Figure 5.
Ntụle nke isi shapes na isi ihe maka njikarịcha impedance bụ ihe kwụ ọtọ ma ọ bụrụ na onye nrụpụta na-enye eserese nke mgbagwoju anya permeability na ugboro ole maka ihe ferrite akwadoro maka ngwa suppression. N'ụzọ dị mwute, ozi a adịghị adịkarị. site na data a, enwere ike nweta ntụnyere ihe eji ebuli ihe mgbochi isi.
N'izo aka na onyonyo nke 6, ihe izizi izizi na ihe mgbasa [4] nke ihe dị na Fair-Rite 73 na ugboro ole, na-eche na onye mmebe chọrọ ikwe nkwa nhụsianya kachasị n'etiti 100 na 900 kHz. A họọrọ ihe 73. Maka ebumnuche nhazi, onye nrụpụta nwekwara kwesịrị ịghọta akụkụ mmeghachi omume na mgbochi nke vector impedance na 100 kHz (105 Hz) na 900 kHz. Enwere ike nweta ozi a site na eserese a:
Na 100kHz μs '= μi = 2500 na (Tan δ / μi) = 7 x 10-6 n'ihi na Tan δ = μs "/ μs' wee μs" = (Tan δ / μi) x (μi) 2 = 43.8
Ekwesiri iburu n'uche na, dika aturu anya, μ" na-agbakwunye obere ihe na mkpokọta permeability vector na obere oge a. Ihe mgbochi nke isi na-abụkarị inductive.
Ndị na-emepụta ihe maara na isi ahụ aghaghị ịnakwere waya # 22 ma daba n'ime oghere 10 mm x 5 mm. A ga-akọwapụta dayameta nke dị n'ime dị ka 0.8 mm. Iji dozie maka impedance a na-eme atụmatụ na ihe ndị mejupụtara ya, buru ụzọ họrọ bead na dayameta dị n'èzí. 10 mm na ịdị elu nke 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 ohms na 100 kHz
N'okwu a, dịka n'ọtụtụ ọnọdụ, a na-enweta ihe mgbochi kachasị site na iji obere OD nwere ogologo ogologo. Ọ bụrụ na ID ahụ dị ukwuu, dịka 4mm, na ntụgharị.
Enwere ike iji otu ụzọ ahụ ma ọ bụrụ na etinyere atụmatụ nke impedance kwa otu Lo na akụkụ akụkụ na ugboro ugboro. Foto 9, 10 na 11 na-anọchi anya akụkụ ndị dị otú ahụ maka otu ihe atọ a na-eji ebe a.
Ndị na-emepụta ihe na-achọ ịkwado nkwụsị kachasị elu n'elu 25 MHz ruo 100 MHz. Oghere ebe dịnụ dị ọzọ 10mm x 5mm na isi ga-anabata #22 awg wire. ma ọ bụ eserese 8 maka mgbagwoju anya nke otu ihe atọ ahụ, họrọ ihe 850 μi.[5] N'iji eserese dị na eserese 9, Z/Lo nke ihe na-eme ka ọ dị ọkara bụ 350 x 108 ohm/H na 25 MHz. Na-edozi maka mgbochi a na-eme atụmatụ:
Mkparịta ụka bu ụzọ na-eche na isi nhọrọ bụ cylindrical. Ọ bụrụ na a na-eji cores ferrite maka eriri rịbọn dị larịị, eriri ejikọta ọnụ, ma ọ bụ efere ndị gbawara agbawa, ngụkọta nke Lo na-esiwanye ike, na n'ụzọ ziri ezi ogologo ụzọ ogologo na ọnụ ọgụgụ mpaghara dị irè ga-enwetarịrị. iji gbakọọ ikuku isi inductance .Nke a nwere ike ime site na mgbakọ na mwepụ na-egbutu isi ma na-agbakwụnye ogologo ụzọ gbakọọ na mpaghara magnetik maka iberi ọ bụla. Otú ọ dị, n'ọnọdụ ọ bụla, mmụba ma ọ bụ mbelata na mgbochi ga-adaba na mmụba ma ọ bụ ibelata. ịdị elu/ogologo nke isi ferrite.[6]
Dịka e kwuru, ọtụtụ ndị na-emepụta ihe na-akọwapụta cores maka ngwa EMI n'ihe gbasara impedance, mana onye ọrụ njedebe na-achọkarị ịma attenuation. Mmekọrịta dị n'etiti paramita abụọ a bụ:
Mmekọrịta a na-adabere na mgbochi nke isi iyi nke na-emepụta mkpọtụ na nkwụsị nke ibu na-anata mkpọtụ ahụ. Ụkpụrụ ndị a na-abụkarị ọnụ ọgụgụ dị mgbagwoju anya, nke oke ha nwere ike ịbụ enweghị njedebe, ma ọ bụghị ngwa ngwa maka onye mmepụta. Ịhọrọ uru nke 1 ohm maka ibu na impedances isi iyi, nke nwere ike ime mgbe isi mmalite bụ ọkụ ọkụ mode na-ebu ọtụtụ sekit impedance dị ala, na-eme ka nha anya dị mfe ma na-enye ohere iji tụnyere attenuation nke cores ferrite.
Eserese dị na eserese 12 bụ usoro okirikiri na-egosi mmekọrịta dị n'etiti mgbochi mgbochi ọta na attenuation maka ọtụtụ ụkpụrụ nkịtị nke ibu yana impedance generator.
Ọgụgụ 13 bụ sekit dakọtara nke isi iyi nnyonye anya nwere nguzogide dị n'ime nke Zs. A na-emepụta akara nnyonye anya site na usoro impedance Zsc nke isi ihe na-egbochi ibu na ibu impedance ZL.
Ọnụ ọgụgụ 14 na 15 bụ eserese nke impedance na okpomọkụ maka otu ihe atọ ferrite. Ihe kachasị mma n'ime ihe ndị a bụ ihe 61 na-ebelata 8% na nkwụsị na 100º C na 100 MHz. N'ụzọ dị iche, ihe 43 gosipụtara 25. % dobe na impedance n'otu oge na okpomọkụ. Agụmakwụkwọ ndị a, mgbe enyere ya, enwere ike iji dozie ihe mgbochi okpomọkụ nke ọnụ ụlọ ahụ akọwapụtara ma ọ bụrụ na attenuation na okpomọkụ dị elu chọrọ.
Dị ka ọ dị na okpomọkụ, DC na 50 ma ọ bụ 60 Hz na-enye mmiri na-emetụtakwa otu ihe ndị dị na ferrite, nke n'aka nke ya na-eme ka ọkpụkpụ isi dị ala. Ihe oyiyi 16, 17 na 18 bụ ihe mgbagwoju anya nke na-egosipụta mmetụta nke nhụsianya na impedance nke ihe ferrite. . Nke a na-agbagharị na-akọwa mmebi nke impedance dị ka ọrụ nke ike ubi maka otu ihe dị ka ọrụ nke ugboro ugboro.
Ebe ọ bụ na chịkọtara data a, Fair-Rite Products ewebatala ihe ọhụrụ abụọ.Our 44 bụ ihe na-eme ka nickel-zinc ọkara permeability na 31 anyị bụ manganese-zinc elu permeability ihe.
Ọnụọgụ 19 bụ atụmatụ nke impedance megide ugboro ole maka beads nke otu nha na ihe 31, 73, 44 na 43. Ihe 44 bụ ihe 43 dị mma nke nwere elu DC resistivity, 109 ohm cm, mma thermal shock properties, okpomọkụ nkwụsi ike na elu Curie okpomọkụ (Tc) .The 44 ihe nwere ubé elu impedance vesos ugboro e ji mara tụnyere anyị 43 material. The guzo ihe 31 exhibits a elu impedance karịa ma 43 ma ọ bụ 44 n'elu dum nha ugboro range.The 31 e mere iji belata na nsogbu resonance akụkụ nke na-emetụta obere arụmọrụ suppression dị ala nke nnukwu manganese-zinc cores na etinyere ya nke ọma na cores suppression cable na nnukwu toroidal cores.Ọnụ ọgụgụ 20 bụ atụmatụ nke impedance megide ugboro ugboro maka 43, 31, na 73 ihe maka ngosi ngosi. -Rite cores nwere 0.562 ″ OD, 0.250 ID, na 1.125 HT. Mgbe ị na-atụnyere eserese 19 na eserese 20, ekwesịrị iburu n'uche na maka obere cores, maka ugboro ugboro ruo 25 MHz, ihe 73 bụ ihe na-egbochi ihe kacha mma. Otú ọ dị, dị ka akụkụ obe isi na-abawanye, ọnụọgụ kachasị na-ebelata. Dị ka egosiri na data dị na eserese 20, 73 kacha mma Ugboro kachasị elu bụ 8 MHz. Ọ dịkwa mma ịmara na ihe 31 ahụ na-arụ ọrụ nke ọma na ọnụọgụ ugboro site na 8 MHz ruo 300 MHz. Otú ọ dị, dị ka zinc ferrite manganese, ihe 31 ahụ nwere ihe mgbochi olu dị ala nke 102 ohms -cm, na mgbanwe ndị ọzọ na-agbanwe na mgbanwe okpomọkụ.
Glossary Air Core Inductance - Lo (H) Inductance nke a ga-atụle ma ọ bụrụ na isi nwere otu permeability na nkesa flux nọgidere na-adịgide adịgide.General usoro Lo= 4π N2 10-9 (H) C1 Ring Lo = .0461 N2 log10 (OD) / ID) Ht 10-8 (H) Akụkụ dị na mm
Attenuation - A (dB) Mbelata nke njupụta mgbaàmà na nnyefe site n'otu ebe gaa na nke ọzọ.
Core Constant - C1 (cm-1) Nchikota nke ogologo ụzọ magnetik nke akụkụ ọ bụla nke sekit magnetik kewara site na mpaghara magnetik kwekọrọ nke otu ngalaba.
Core Constant - C2 (cm-3) Nchikota nke ogologo sekit magnetik nke akụkụ ọ bụla nke sekit magnetik kewara site na square nke ngalaba magnetik kwekọrọ nke otu ngalaba ahụ.
The irè akụkụ nke magnetik ụzọ mpaghara Ae (cm2), ụzọ ogologo le (cm) na olu Ve (cm3) Maka a nyere isi geometry, a na-eche na magnetik ụzọ ogologo, cross-section mpaghara, na olu nke. Toroidal core nwere otu ihe onwunwe dị ka ihe kwesịrị inwe ihe ndọta nke kwekọrọ na isi nyere.
Ike Ubi – H (Oersted) Ihe njiri mara oke ike ubi.H = .4 π NI/le (Oersted)
Flux Density – B (Gaussian) Ihe nkwekọ kwekọrọ na oghere ndọta ebutere na mpaghara ahụ na-agakarị n'okporo ụzọ mgbagharị.
Impedance – Z (ohm) Enwere ike igosipụta ihe mgbochi nke ferrite n'ihe gbasara ịdị mgbagwoju anya ya.Z = jωLs + Rs = jω Lo(μs'- jμs”) (ohm)
Tangent Loss - tan δ Tangent ọnwụ nke ferrite hà nhata nke sekit Q.
Ihe kpatara ọnwụ – tan δ/μi mwepụ usoro n'etiti ihe ndị bụ isi nke njupụta magnetik na ike ubi nwere ikike izizi.
Ike ndọta - μ Igwe ndọta nke ewepụtara site na nha nke njupụta ndọta na ike mpaghara ọzọ etinyere bụ…
Mmụba nke ukwuu, μa - mgbe uru akọwapụtara nke njupụta njupụta dị ukwuu karịa uru ejiri maka ikike izizi mbụ.
Permeability dị irè, μe - Mgbe a na-eji otu oghere ikuku ma ọ bụ karịa rụọ ụzọ magnetik, ihe na-eme ka ọ bụrụ ihe na-eme ka ihe dị iche iche na-eche echiche nke ga-enye otu enweghị mmasị.
In Compliance bụ isi mmalite nke akụkọ, ozi, agụmakwụkwọ na mkpali maka ndị ọkachamara injinia na eletrọnịkị.
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