nkhani

Ngakhale kutsokomola wamba kumakhala kotchuka, njira ina ikhoza kukhala fyuluta ya monolithic EMI. Ikayikidwa bwino, zigawo za ceramic za multilayer zimapereka kukana phokoso kofananira.
Zinthu zambiri zimachulukitsa kuchuluka kwa kusokoneza kwa "phokoso" komwe kungawononge kapena kusokoneza magwiridwe antchito a zida zamagetsi. Magalimoto amasiku ano ndi chitsanzo chabwino. ndicho chiyambi chabe.Kuti athetse kusokoneza kwa phokosoli, makampaniwa amagwiritsa ntchito zotetezera ndi EMI zosefera kuti athetse phokoso losafunikira.
Vutoli limapangitsa kuti ma OEM ambiri apewe kugwiritsa ntchito kusiyana kwa 2-capacitor, 3-capacitor (mmodzi X capacitor ndi 2 Y capacitor), zosefera, zosefera wamba, kapena kuphatikiza izi kuti mupeze yankho labwino kwambiri monga sefa ya monolithic EMI yokhala ndi bwino kukana phokoso mu phukusi laling'ono.
Zida zamagetsi zikalandira mafunde amphamvu amagetsi, mafunde osafunikira amatha kupangitsidwa kuzungulira ndikuyambitsa ntchito yosakonzekera - kapena kusokoneza ntchito yomwe akufuna.
EMI / RFI ikhoza kukhala mu mawonekedwe a kuchitidwa kapena kutulutsa mpweya.Pamene EMI ikuchitidwa, zikutanthauza kuti phokoso limayenda pamodzi ndi magetsi.
Ngakhale mphamvu yogwiritsidwa ntchito kuchokera kunja ndi yaying'ono, ngati ikusakanikirana ndi mafunde a wailesi omwe amagwiritsidwa ntchito pofalitsa ndi kulankhulana, angayambitse kutaya kwa kulandira, phokoso lachilendo m'mawu, kapena kusokoneza mavidiyo.Ngati mphamvuyo ndi yamphamvu kwambiri, imatha kuwononga zida zamagetsi.
Zochokera kumaphatikizapo phokoso lachilengedwe (mwachitsanzo, kutulutsa ma electrostatic, kuyatsa, ndi zina) ndi phokoso lopangidwa ndi anthu (mwachitsanzo, phokoso la kukhudzana, zida zotayira pogwiritsa ntchito ma frequency apamwamba, mpweya wosafunikira, ndi zina). Nthawi zambiri, phokoso la EMI/RFI ndi phokoso wamba , kotero yankho ndilo kugwiritsa ntchito fyuluta ya EMI kuchotsa maulendo apamwamba osafunika, kaya ngati chipangizo chosiyana kapena chophatikizidwa mu bolodi la dera.
Zosefera za EMI Zosefera za EMI nthawi zambiri zimakhala ndi zinthu zopanda pake, monga ma capacitor ndi ma inductors, omwe amalumikizidwa kuti apange dera.
"Ma inductors amalola DC kapena ma frequency otsika kuti adutse ndikutsekereza mafunde osafunikira, osafunikira. Ma capacitors amapereka njira yochepetsera kusokoneza phokoso lapamwamba kwambiri kuchokera ku zolowetsa zosefera ku mphamvu kapena kugwirizanitsa pansi, "Manufactures a Multilayer Ceramic anati Christophe Cambrelin wa kampani ya capacitor Johanson Dielectrics.EMI fyuluta.
Njira zosefera zodziwika bwino zimaphatikizira zosefera zotsika pang'ono pogwiritsa ntchito ma capacitor omwe amadutsa ma siginecha ndi ma frequency ochepera osankhidwa ndikuchepetsa ma siginecha ndi ma frequency apamwamba kuposa ma frequency odulidwa.
Choyambira chodziwika bwino ndicho kugwiritsa ntchito ma capacitor pamasinthidwe osiyanitsira, okhala ndi capacitor imodzi pakati pa njira iliyonse yolowera mosiyanasiyana ndi nthaka. Zosefera zamphamvu pa mwendo uliwonse zimapatutsa EMI/RFI pansi pamwamba pa mafupipafupi odulidwa. kutumiza zizindikiro za magawo otsutsana pa mawaya awiri, chiŵerengero cha chizindikiro-ku-phokoso chimakhala bwino pamene phokoso losafunikira limatumizidwa pansi.
"Mwatsoka, mtengo wa capacitance wa MLCCs ndi X7R dielectrics (omwe amagwiritsidwa ntchito kwambiri pa ntchitoyi) ukhoza kusiyana kwambiri ndi nthawi, bias voltage ndi kutentha," adatero Cambrelin.
"Chifukwa chake ngakhale ma capacitor awiri amafanana kwambiri panthawi yomwe ali ndi kutentha kwapakati pamagetsi otsika, amatha kukhala ndi mitundu yosiyana kwambiri kamodzi nthawi, magetsi kapena kusintha kwa kutentha. Kusagwirizana kumeneku pakati pa mawaya awiriwa Kufananitsa kumabweretsa mayankho osagwirizana pafupi ndi kudulidwa kwa fyuluta. Chifukwa chake, imasintha maphokoso amtundu wamba kukhala maphokoso osiyana. ”
Njira ina ndiyo kulumikiza mtengo waukulu wa "X" capacitor pakati pa ma capacitor awiri a "Y". "X" capacitive shunt imapereka njira yabwino yofananira, komanso imakhala ndi zotsatira zosafunika za kusefa kwa ma signal osiyana.Mwina njira yothetsera vutoli. ndi m'malo otsika chiphaso fyuluta ndi wamba mode tsamwitsa.
Njira yodziwika bwino yotsamwitsa ndi thiransifoma ya 1: 1 yokhala ndi makhoma onse awiri omwe amagwira ntchito ngati pulayimale ndi yachiwiri. Munjira iyi, mafunde amadzimadzi amadzipangitsa kuti pakhale mafunde otsutsana ndi mafunde ena. kulephera kochititsidwa ndi kugwedezeka.
Komabe, njira yabwino wamba kutsamwitsidwa ndi mafananidwe wangwiro ndi kugwirizana pakati ma windings ndi mandala kwa zizindikiro zosiyana ndipo ali ndi impedance mkulu kwa wamba mode noise.Kuipa Mmodzi wa wamba mode kutsamwitsa ndi malire pafupipafupi osiyanasiyana chifukwa cha parasitic capacitance.Kwa anapatsidwa pachimake zakuthupi. , kukweza kwa inductance komwe kumagwiritsidwa ntchito kuti mupeze kusefa kwafupipafupi, kutembenuka kumafunikanso, motero kumapangitsa kuti ma parasitic capacitances asadutse kusefa kwafupipafupi.
Kusagwirizana pakati pa ma windings chifukwa cha kulolerana kwa makina opanga makina kumayambitsa kusintha kwa ma mode, komwe gawo la mphamvu ya chizindikiro limasinthidwa kukhala phokoso lamtundu wamba komanso mosinthanitsa.
Mosasamala kanthu, kutsokomola wamba kumakhala ndi zabwino zambiri kuposa zosankha zina pamene chizindikiro chosiyanitsa (kudutsa) chimagwira ntchito pafupipafupi monga phokoso lamtundu wamba lomwe liyenera kukanidwa. wamba mode kukanidwa gulu.
Zosefera za Monolithic EMI Ngakhale zosefera zamtundu wamba ndizodziwika bwino, zosefera za monolithic EMI zitha kugwiritsidwanso ntchito. Zikayikidwa bwino, zigawo za ceramic zamitundu yambiri zimapereka kukana phokoso lodziwika bwino. Iwo amaphatikiza ma shunt capacitor oyenderana mu phukusi limodzi kuti athe kuletsa ndi kutetezana. .Zoseferazi zimagwiritsa ntchito njira ziwiri zosiyana zamagetsi mkati mwa chipangizo chimodzi cholumikizidwa ndi maulumikizidwe anayi akunja.
Pofuna kupewa chisokonezo, ziyenera kuzindikiridwa kuti zosefera za monolithic EMI sizili zachikhalidwe za feedthrough capacitors.Ngakhale zikuwoneka zofanana (zolemba zofanana ndi maonekedwe), zimakhala zosiyana kwambiri ndi mapangidwe, ndipo sizigwirizana mofanana.Monga EMI zina. Zosefera, zosefera za monolithic EMI zimachepetsetsa mphamvu zonse pamwamba pa mafupipafupi odulira ndikusankha kungodutsa mphamvu yama siginecha yomwe mukufuna, kwinaku mukupatutsa phokoso losafunikira "pansi".
Komabe, chinsinsicho ndi chochepa kwambiri cha inductance ndi impedance yofanana.Kwa zosefera za monolithic EMI, ma terminals amalumikizidwa mkati ndi ma elekitirodi wamba (chishango) mkati mwa chipangizocho, ndipo mbale zimasiyanitsidwa ndi ma electrode. amapangidwa ndi ma theka awiri a capacitive omwe amagawana ma elekitirodi wamba, onse omwe ali mkati mwa thupi limodzi la ceramic.
Kuchulukana pakati pa magawo awiri a capacitor kumatanthauzanso kuti zotsatira za piezoelectric ndizofanana ndi zosiyana, kulepheretsana wina ndi mzake. Zosefera, ndikuti sizingagwire ntchito ngati phokoso lamtundu wamba limakhala pafupipafupi ngati siginecha yosiyana.
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