Ihe nzacha ihe nzacha, ndị inductor na-ahụkarị, na bead magnet bụ ihe a na-ahụkarị na sekit imewe EMC, ma bụrụkwa ngwaọrụ atọ dị ike iji kpochapụ nnyonye anya elektrọn.
Maka ọrụ nke atọ ndị a na sekit, ekwenyere m na e nwere ọtụtụ ndị injinia aghọtaghị, isiokwu sitere na nhazi nke nyocha zuru ezu nke ụkpụrụ nke ikpochapụ EMC atọ kachasị mma.
1.Filter capacitor
Ọ bụ ezie na resonance nke capacitor adịghị mma site n'echiche nke nzacha ụda ugboro ugboro, resonance nke capacitor adịghị emerụ ahụ mgbe niile.
Mgbe a na-ekpebi ugboro ole mkpọtụ a ga-enyocha, enwere ike ịhazigharị ikike nke capacitor ka ebe resonant dabara naanị n'oge ọgba aghara.
N'ime injinia bara uru, ugboro ụda electromagnetic a ga-enyocha na-adịkarị elu ka narị narị MHz, ma ọ bụ ọbụna karịa 1GHz.Maka ụda elektrọn magnetik dị elu dị otú ahụ, ọ dị mkpa iji capacitor site na isi iji nyochaa nke ọma.
Ihe kpatara na capacitors nkịtị enweghị ike nyochaa nke ọma mkpọtụ ụda ugboro ugboro bụ n'ihi ihe abụọ:
(1) Otu ihe kpatara ya bụ na inductance nke capacitor ndu na-akpata resonance capacitor, nke na-enye nnukwu ihe mgbochi na mgbama dị elu, ma na-ebelata mmetụta nkwụsị nke mgbaàmà dị elu;
(2) Ihe ọzọ kpatara ya bụ na ikike parasitic dị n'etiti wires na-ejikọta akara ngosi dị elu, na-ebelata mmetụta nzacha.
Ihe kpatara na site-core capacitor nwere ike nyochaa nke ọma mkpọtụ ụda ugboro ugboro bụ na site-core capacitor ọ bụghị naanị na enweghị nsogbu na inductance ndu na-eme ka ụda resonance capacitor dị ala.
Na site-isi capacitor nwere ike tinye ozugbo na metal panel, na-eji metal panel na-arụ ọrụ nke elu-ugboro iche iche.Otú ọ dị, mgbe ị na-eji site-core capacitor, nsogbu ị ga-aṅa ntị bụ nsogbu nrụnye.
Nnukwu adịghị ike nke site-isi capacitor bụ egwu nke elu okpomọkụ na mmetụta okpomọkụ, nke na-akpata nnukwu ihe isi ike mgbe ịgbado ọkụ site-isi capacitor na metal panel.
Ọtụtụ capacitors na-emebi emebi n'oge ịgbado ọkụ.Karịsịa mgbe a ga-etinye ọnụ ọgụgụ dị ukwuu nke isi ihe na-arụ ọrụ na panel ahụ, ọ bụrụhaala na enwere mmebi, ọ na-esiri ike ịrụzi ya, n'ihi na mgbe a na-ewepụ capacitor mebiri emebi, ọ ga-emebi ihe ndị ọzọ dị nso.
2.Common mode inductance
Ebe ọ bụ na nsogbu EMC na-eche ihu na-abụkarị nnyonye anya ọnọdụ, ndị inductor mode bụ otu n'ime ngwa ike anyị na-ejikarị.
The nkịtị mode inductor bụ a nkịtị mode nnyonye anya suppression ngwaọrụ na ferrite dị ka isi, nke mejupụtara abụọ coils nke otu size na otu ọnụ ọgụgụ nke atụgharị symmetrically ọnya na otu Ferrite mgbanaka magnetik isi na-etolite a anọ ọnụ ngwaọrụ, nke. nwere nnukwu mmetụta nkwụsị inductance maka mgbaàmà ọnọdụ nkịtị, yana obere ntapu inductance maka mgbama ọnọdụ dị iche.
Ụkpụrụ bụ na mgbe ọnọdụ nkịtị ugbu a na-asọba, ụda magnetik na mgbanaka magnetik na-ebuli ibe ya elu, si otú a nwee nnukwu inductance, nke na-egbochi ọnọdụ ọnọdụ nkịtị ugbu a, na mgbe eriri abụọ ahụ na-asọba site na ọnọdụ dị iche iche ugbu a, ụda magnetik. na magnetik mgbanaka kagbuo onye ọ bụla ọzọ, na ọ fọrọ nke nta ka ọ dịghị inductance, otú ahụ dị iche iche mode ugbu a nwere ike ịgafe na-enweghị attenuation.
Ya mere, ihe inductor nke na-ahụkarị nwere ike igbochi mgbaàmà nnyonye anya nkịtị na ahịrị kwụ ọtọ, mana ọ nweghị mmetụta ọ bụla na nnyefe nkịtị nke mgbaàmà ọnọdụ dị iche.
Ndị inductor ụdị nkịtị kwesịrị iru ihe ndị a chọrọ mgbe arụpụtara ha:
(1) A ga-edobe wires ndị ahụ merụrụ ahụ na eriri igwe iji hụ na enweghị sekit mkpirisi ndakpọ n'etiti ntụgharị nke eriri igwe n'okpuru ọrụ nke oke ọkụ ọkụ ozugbo;
(2) Mgbe eriri igwe na-agafe na nnukwu mmiri ozugbo, ihe ndọta ahụ ekwesịghị ijupụta;
(3) Igwe ndọta dị na eriri igwe kwesịrị ka edochi ya site na eriri igwe iji gbochie ndakpọ n'etiti abụọ n'okpuru omume nke oke ọkụ ọkụ ozugbo;
(4) A ga-emerụ eriri igwe ahụ n'otu oyi akwa dị ka o kwere mee, ka o wee belata ikike nke parasitic nke eriri igwe ma welie ikike nke eriri igwe na-ebufe oke ọkụ.
N'okpuru nkịtị ọnọdụ, mgbe ịṅa ntị na nhọrọ nke ugboro gbalaga chọrọ nyo, ibu ndị nkịtị-mode impedance, mma, otú anyị kwesịrị anya na ngwaọrụ data mgbe ahọpụta ndị nkịtị-mode inductor, tumadi dị ka mkpirisi ugboro ugboro.
Tụkwasị na nke ahụ, mgbe ị na-ahọrọ, ṅaa ntị na mmetụta nke impedance mode dị iche na mgbaàmà, na-elekwasị anya na impedance mode dị iche, karịsịa na-aṅa ntị na ọdụ ụgbọ mmiri dị elu.
3.Magnetic bead
Na ngwaahịa dijitalụ sekit EMC imewe usoro, anyị na-ejikarị magnetik beads, ferrite ihe bụ ígwè-magnesium alloy ma ọ bụ ígwè-nickel alloy, ihe a nwere nnukwu magnetik permeability, ọ nwere ike ịbụ inductor n'etiti eriri igwe winding n'ihe banyere elu. ugboro na elu nguzogide eme capacitance kacha nta.
A na-ejikarị ihe ferrite eme ihe n'ogo dị elu, n'ihi na na obere oge, njirimara inductance ha bụ isi na-eme ka ọnwụ dị n'ahịrị dị ntakịrị.N'oge dị elu, ha na-abụkarị ọnụọgụ njirimara mmeghachi omume na mgbanwe na ugboro ole.N'ime ngwa bara uru, a na-eji ihe ferrite mee ihe dị ka ihe na-eme ka ọ dị elu maka sekit ugboro redio.
N'ezie, ferrite dị mma karịa nhata nke nguzogide na inductance, nguzogide na-adị mkpụmkpụ site na inductor na obere oge, na impedance inductor na-aghọ nnọọ elu na elu ugboro, nke mere na ugbu a niile na-agafe na-eguzogide.
Ferrite bụ ngwaọrụ na-eri nri nke a na-atụgharị ike ugboro ugboro ka ọ bụrụ ike ọkụ, nke a na-ekpebi site na njirimara nguzogide eletrik ya.Ihe nzacha magnetik Ferrite nwere njirimara nzacha dị elu karịa ka inductor nkịtị.
Ferrite na-eguzogide n'ọtụtụ dị elu, ya na onye inductor nwere ihe dị oke ala, ya mere ọ nwere ike ịnọgide na-enwe ihe mgbochi dị elu n'ọtụtụ dịgasị iche iche, si otú ahụ na-eme ka arụmọrụ nke nzacha dị elu dị elu.
Na obere ugboro band, impedance mejupụtara inductance.Na obere oge, R dị ntakịrị, na ike ndọta nke isi dị elu, ya mere inductance dị ukwuu.L na-arụ nnukwu ọrụ, na ntụgharị uche na-egbochi nnyonye anya electromagnetic.Na n'oge a, ọnwụ nke magnetik isi bụ obere, dum ngwaọrụ bụ a ala ọnwụ, elu Q e ji mara nke inductor, nke a inductor dị mfe ime ka resonance, otú na ala ugboro band, mgbe ụfọdụ, e nwere ike enwekwukwa nnyonye anya. mgbe eji ferrite magnetik beads.
N'ime eriri ugboro dị elu, impedance bụ ihe ndị na-eguzogide.Ka ọnụọgụgụ na-abawanye, ikike ikike ndọta na-ebelata, na-ebute mbelata nke inductance nke inductor na mbelata nke akụrụngwa reactance inductive.
Otú ọ dị, n'oge a, nkwụsị nke isi ihe ndọta na-abawanye, akụkụ ndị na-eguzogide na-abawanye, na-eme ka mmụba na njedebe zuru oke, na mgbe mgbaàmà dị elu na-agafe na ferrite, ntinye aka electromagnetic na-etinye uche ma gbanwee n'ime ụdị. nke ikpo ọkụ.
A na-eji ihe mgbochi ferrite eme ihe na bọọdụ sekit ebipụtara, ahịrị ọkụ na ahịrị data.Dịka ọmụmaatụ, a na-agbakwunye ihe mgbochi ferrite na njedebe ntinye nke eriri ike nke bọọdụ a na-ebipụta iji kpochapụ nnyonye anya ugboro ugboro.
A na-eji mgbanaka magnetik ferrite ma ọ bụ bead ndọta pụrụ iche iji gbochie nnyonye anya ugboro ugboro na nnyonye anya kacha elu na ahịrị mgbama na ahịrị ike, yana ọ nwekwara ikike ịmịnye nnyonye anya mwepu electrostatic.Ojiji mgbawa magnetik ma ọ bụ mgbawa inductor dabere na ngwa bara uru.
A na-eji inductor nke mgbawa eme ihe na sekit resonant.Mgbe ekwesịrị ikpochapụ mkpọtụ EMI na-enweghị isi, iji mgbawa magnetik bụ nhọrọ kacha mma.
Ngwa nke mgbawa magnetik beads na mgbawa inductor
Inductor nke mgbawa:Ugboro redio (RF) na nkwukọrịta ikuku, ngwa teknụzụ ozi, ihe nchọpụta radar, igwe eletrọnịkị ụgbọ ala, ekwentị ekwentị, pagers, akụrụngwa ọdịyo, ndị enyemaka dijitalụ nkeonwe (PDAs), sistemu njikwa ikuku ikuku, na modul ọkọnọ ọkụ dị ala.
Chip magnetik beads:Sekit na-emepụta elekere, nzacha n'etiti sekit analọgụ na dijitalụ, ntinye I/O / mmepụta njikọ dị n'ime (dị ka ọdụ ụgbọ mmiri, ọdụ ụgbọ mmiri, ahụigodo, oke, nkwukọrịta ogologo, netwọk mpaghara), sekit RF na ngwaọrụ mgbagha nwere ike ibute ya. nnyonye anya, nzacha nke nnyonye anya dị elu na-eme nnyonye anya na sekit ọkọnọ ike, kọmpụta, ngwa nbipute, ihe ndekọ vidiyo (VCRS), mkpochapụ mkpọtụ EMI na sistemu telivishọn na ekwentị mkpanaaka.
Akụkụ nke magnetik bead bụ ohms, n'ihi na unit nke magnetik bead bụ nominal dị ka impedance ọ na-emepụta na oge ụfọdụ, na unit nke impedance bụkwa ohms.
Ihe ndọta DATASHEET ga-enyekarị ọnụọgụ na njirimara impedance nke usoro, n'ozuzu 100MHz dị ka ọkọlọtọ, dịka ọmụmaatụ, mgbe ugboro 100MHz mgbe mgbochi nke magnetik bead bụ 1000 ohms.
Maka eriri ugboro anyị chọrọ nzacha, anyị kwesịrị ịhọrọ nnukwu ihe mgbochi nke magnetik bead, nke ka mma, na-ahọrọkarị impedance 600 ohm ma ọ bụ karịa.
Na mgbakwunye, mgbe ị na-ahọrọ bead magnetik, ọ dị mkpa ịṅa ntị na ntụgharị nke bead magnetik, nke na-achọkarị ka 80% mebie ya, na mmetụta nke impedance DC na ọdịda voltaji kwesịrị ịtụle mgbe ejiri ya na sekit ike.
Oge nzipu: Jul-24-2023