Masefa capacitor, akajairika-modhi inductors, uye magineti mabedhi zvimiro zvakajairika muEMC dhizaini maseketi, uye zvakare matatu maturusi ane simba ekubvisa kukanganiswa kwemagetsi.
Zvebasa revatatu ava mudunhu, ndinotenda kune akawanda mainjiniya asinganzwisise, chinyorwa kubva padhizaini yekuongorora kwakadzama kweiyo musimboti wekubvisa matatu EMC akapinza.
1.Sefa capacitor
Kunyange zvazvo resonance ye capacitor isingadiwi kubva pakuona kwekusefa kunze kwepamusoro-frequency ruzha, resonance ye capacitor haisi nguva dzose inokuvadza.
Kana kuwanda kweruzha kunofanirwa kusefa kwakatemwa, kugona kwe capacitor kunogona kugadziridzwa kuitira kuti resonant point inongowira pane yekukanganisa frequency.
Muinjiniya inoshanda, kuwanda kweruzha rwemagetsi kusefa kazhinji kunosvika mazana eMHz, kana kutopfuura 1GHz. Kune yakadai yakakwira frequency electromagnetic ruzha, zvinodikanwa kushandisa kuburikidza-musimboti capacitor kunyatsosefa kunze.
Chikonzero nei akajairwa capacitor asingakwanise kusefa kunze kwepamusoro-frequency ruzha imhaka yezvikonzero zviviri:
(1) Chimwe chikonzero ndechokuti inductance ye capacitor lead inokonzera capacitor resonance, iyo inopa impedance yakakura kune iyo yakakwirira-frequency chiratidzo, uye inoderedza simba rebypass yechiratidzo chepamusoro-frequency;
(2) Chimwe chikonzero ndechekuti iyo parasitic capacitance pakati pewaya dzinobatanidza iyo yakakwirira-frequency chiratidzo, ichideredza kusefa mhedzisiro.
Chikonzero nei iyo kuburikidza-core capacitor ichikwanisa kusefa kunze kwepamusoro-frequency ruzha ndechekuti kuburikidza-core capacitor kwete chete haina dambudziko rekuti iyo inotungamira inductance inokonzera iyo capacitor resonance frequency yakanyanya kuderera.
Uye iyo kuburikidza-core capacitor inogona kuiswa yakananga pane simbi panel, uchishandisa simbi pani kuita basa repamusoro-frequency isolation. Nekudaro, kana uchishandisa iyo kuburikidza-core capacitor, dambudziko rekutarisisa ndiro dambudziko rekuisa.
Kunyanya kushaya simba kweiyo-core capacitor kutya kwekushisa kwakanyanya uye tembiricha kukanganisa, izvo zvinokonzeresa kuoma kukuru kana welding the through-core capacitor kune simbi panel.
Mazhinji capacitor akakuvadzwa panguva yewelding. Kunyanya kana nhamba huru ye core capacitors inoda kuiswa panhizha, chero bedzi pane kukanganisa, zvakaoma kugadzirisa, nokuti kana capacitor yakakanganiswa ichibviswa, inokonzera kukanganisa kune mamwe mavhavha ari pedyo.
2.Common mode inductance
Sezvo matambudziko akatarisana neEMC anowanzo kupindira maitiro, zvakajairika modhi inductors zvakare chimwe chezvinhu zvedu zvinowanzoshandiswa zvine simba.
Iyo yakajairika modhi inductor ndeye yakajairika nzira yekukanganisa kudzvanya mudziyo ine ferrite seyapakati, iyo ine macoil maviri ehukuru hwakafanana uye huwandu hwakafanana hwekutendeuka hwakakuvara painofanana ferrite mhete yemagineti core kuita ina-terminal mudziyo, iyo. ine hombe inductance kudzvanya mhedzisiro yeiyo yakajairika modhi siginecha, uye diki leakage inductance yeiyo yekusiyanisa modhi chiratidzo.
Nheyo yacho ndeyekuti kana iyo yakajairika modhi ikozvino ichiyerera, iyo magineti flux mumhete yemagineti inokwirisana, nekudaro iine inductance yakakura, iyo inodzivirira yakajairika modhi yazvino, uye kana maviri macoil achiyerera kuburikidza nekusiyanisa mode ikozvino, iyo magineti flux. mumhete yemagineti inodzima mumwe nemumwe, uye panenge pasina inductance, saka iyo yekusiyanisa mode ikozvino inogona kupfuura pasina attenuation.
Naizvozvo, iyo yakajairwa modhi inductor inogona kunyatso kudzvanya iyo yakajairika modhi yekupindira chiratidzo mumutsara wakaenzana, asi haina mhedzisiro pane yakajairwa kutapurirana kweiyo musiyano modhi chiratidzo.
Common mode inductors anofanirwa kuzadzisa zvinotevera zvinodiwa kana agadzirwa:
(1) Mawaya akakuvadzwa pacoil musimboti anofanirwa kuvharirwa kuti ave nechokwadi chekuti hapana kuparara kupfupi wedunhu pakati pekutendeuka kwekoiri pasi pechiito chekukurumidza overvoltage;
(2) Kana iyo coil ichiyerera kuburikidza nekukasira kukuru ikozvino, iyo magineti musimboti haifanirwe kuzara;
(3) Iyo magineti musimboti mucoil inofanirwa kuve insulated kubva kucoil kudzivirira kuparara pakati pezviviri pasi pechiito chekukurumidza overvoltage;
(4) Iyo coil inofanira kukuvadzwa muchikamu chimwe chete sezvinobvira, kuitira kuti ideredze parasitic capacitance yecoil uye kuwedzera kugona kwekoiri kutumira overvoltage yenguva pfupi.
Mumamiriro ezvinhu akajairwa, tichiteerera kusarudzwa kweiyo frequency bhendi inodiwa kusefa, iyo yakakura iyo yakajairika-modhi impedance, zviri nani, saka isu tinofanirwa kutarisa data remudziyo pakusarudza iyo yakajairika-modhi inductor, kunyanya zvinoenderana impedance frequency curve.
Uye zvakare, kana uchisarudza, teerera kune kukanganiswa kweiyo differential mode impedance pachiratidzo, kunyanya kutarisa kusiyanisa mode impedance, kunyanya kutarisisa kune yakakwira-kumhanya ports.
3.Magnetic bead
Muchigadzirwa dhijitari redunhu EMC dhizaini dhizaini, isu tinowanzo kushandisa magineti mabheji, ferrite zvinhu isimbi-magnesium alloy kana iron-nickel alloy, chinyorwa ichi chine yakakwira magineti permeability, anogona kunge ari inductor pakati peiyo coil inotenderera mune yakakwira. frequency uye yakakwirira kuramba yakagadzira capacitance mishoma.
Ferrite zvinhu zvinowanzo shandiswa pamafafitera epamusoro, nekuti pane yakaderera frequency yavo huru inductance maitiro anoita kuti kurasikirwa pamutsetse kuve kudiki. Pama frequency akakwira, iwo anonyanya kuita reactance hunhu reshiyo uye shanduko ne frequency. Mumashandisirwo anoshanda, ferrite zvinhu zvinoshandiswa seyakakwira frequency attenuators yeredhiyo frequency maseketi.
Muchokwadi, ferrite iri nani yakaenzana nekuenderana kwekupokana uye inductance, kushorwa kupfupi-kutenderedzwa neiyo inductor pane yakaderera frequency, uye iyo inductor impedance inova yakakwira zvakanyanya pakakwirira frequency, kuitira kuti ikozvino zvese zvipfuure nekupikisa.
Ferrite chinhu chinopedza simba pane iyo yakakwirira-frequency simba inoshandurwa kuita kupisa simba, iyo inotarirwa neayo magetsi ekudzivirira maitiro. Ferrite magineti mabedhi ane zvirinani epamusoro-frequency kusefa maitiro pane akajairwa inductors.
Ferrite inopikisa pamatunhu akakwirira, yakaenzana neinductor ine yakaderera mhando yechinhu, saka inogona kuchengetedza yakakwira impedance pamusoro pehupamhi frequency renji, nekudaro ichivandudza kushanda kweyakakwira frequency kusefa.
Mune yakaderera frequency bhendi, iyo impedance inoumbwa ne inductance. Pazasi frequency, R idiki kwazvo, uye iyo magineti permeability yepakati yakakwira, saka iyo inductance yakakura. L inoita basa rakakura, uye kupindira kwemagetsi kunodzvinyirirwa nekufungisisa. Uye panguva ino, kurasikirwa kwemagnetic core idiki, iyo yese mudziyo kurasikirwa kwakaderera, yakakwira Q maitiro einductor, iyi inductor iri nyore kukonzeresa resonance, saka mune yakaderera frequency bhendi, dzimwe nguva panogona kuve nekuwedzerwa kupindira. mushure mekushandisa ferrite magnetic beads.
Mune yakakwira frequency bhendi, iyo impedance inoumbwa nekupikisa zvikamu. Sezvo kuwanda kunowedzera, kupera kwemagnetic core kunoderera, zvichiita kuti kuderera kweiyo inductance yeinductor uye kuderera kweiyo inductive reactance chikamu.
Nekudaro, panguva ino, kurasikirwa kweiyo magineti core kunowedzera, chikamu chekupikisa chinowedzera, zvichikonzera kuwedzera kweiyo impedance, uye kana iyo yakakwira-frequency chiratidzo ichipfuura nepakati peferrite, iyo electromagnetic kupindira inobatwa uye inoshandurwa kuita fomu. yekupisa kupisa.
Ferrite kudzvinyirira zvikamu zvinoshandiswa zvakanyanya mumabhodhi edunhu akadhindwa, mitsara yemagetsi uye mitsara yedata. Semuenzaniso, ferrite suppression element inowedzerwa kune inopinza tambo yesimba rebhodhi rakadhindwa kuti kusefa kunze kwepamusoro-frequency kupindira.
Ferrite magineti mhete kana magineti bead inoshandiswa zvakanyanya kudzvanyirira kukanganiswa kwepamusoro-frequency uye kupindira kwepamusoro pamitsara yemasaini uye tambo dzemagetsi, uye zvakare inokwanisa kubata electrostatic discharge pulse interference. Iko kushandiswa kwechip magineti mabedhi kana chip inductors zvakanyanya zvinoenderana nekushanda kunoshanda.
Chip inductors anoshandiswa mune resonant circuits. Kana zvisina kufanira EMI ruzha ruchida kubviswa, kushandiswa kwechip magineti mabedhi ndiyo yakanakisa sarudzo.
Kushandiswa kwechip magnetic beads uye chip inductors
Chip inductors:Radhiyo frequency (RF) uye kutaurirana newaya, ruzivo rwemichina yeruzivo, radar detectors, mota dzemagetsi, nharembozha, mapeja, maodhiyo emidziyo, personal digital assistants (PDAs), mawireless remote control system, uye low-voltage magetsi ekupa modules.
Chip magnetic beads:Maseketi anogadzira wachi, kusefa pakati peanalog nedhijitari maseketi, I/O yekupinda/inobuditsa yemukati zvibatanidza (senge serial ports, parallel ports, keyboards, mbeva, kureba nhare, nharaunda nharaunda network), RF maseketi uye logic zvishandiso zvinotapukira. kupindira, kusefa kwe-high-frequency yakaitwa kupindira mumagetsi emagetsi, makomputa, maprinta, vhidhiyo rekodha (VCRS), EMI ruzha kudzvinyirira mumaterevhizheni uye nharembozha.
Iyo unit yemagnetic bead ndeye ohms, nekuti iyo unit yegineti bead inodaidzwa zvinoenderana neiyo impedance inogadzira pane imwe frequency, uye iyo unit ye impedance zvakare ohms.
Iyo magineti bead DATASHEET inowanzopa iyo frequency uye impedance maitiro eiyo curve, kazhinji 100MHz seyakajairwa, semuenzaniso, kana frequency ye100MHz kana iyo impedance yemagnetic bead yakaenzana ne1000 ohms.
Kune frequency bhendi yatinoda kusefa, isu tinofanirwa kusarudza yakakura iyo impedance yeiyo magineti bead, zvirinani, kazhinji sarudza 600 ohm impedance kana kupfuura.
Uye zvakare, pakusarudza magineti mabedhi, zvinofanirwa kutarisisa kuyerera kwemagineti mabedhi, ayo anowanzoda kudzikiswa ne80%, uye pesvedzero yeDC impedance pakudonha kwemagetsi inofanirwa kutariswa kana ichishandiswa mumaseketi emagetsi.
Nguva yekutumira: Jul-24-2023
