xov xwm

Txawm hais tias hom chokes yog nrov, lwm qhov ua tau yog lub lim dej monolithic EMI. Yog tias qhov kev teeb tsa tsim nyog, cov khoom siv sib xyaw ua ke no tuaj yeem muab cov suab nrov zoo sib xws.
Ntau yam ua rau nce qhov "suab nrov" cuam tshuam uas tuaj yeem ua rau puas lossis cuam tshuam rau kev ua haujlwm ntawm cov khoom siv hluav taws xob. Lub tsheb niaj hnub no yog ib qho piv txwv. Hauv tsheb, koj tuaj yeem nrhiav Wi-nkaus, Bluetooth, xov tooj cua satellite, GPS systems, thiab qhov no yog qhov pib xwb. Txhawm rau tswj cov suab nrov zoo li no, kev lag luam feem ntau siv cov ntaub thaiv npog thiab EMI lim kom tshem tawm cov suab nrov tsis xav tau. Tab sis tam sim no qee cov kev daws teeb meem rau kev tshem tawm EMI / RFI tsis siv tau lawm.
Qhov teeb meem no tau ua rau ntau OEMs zam kev xaiv xws li 2-capacitor sib txawv, 3-capacitor (ib qho X capacitor thiab ob lub Y capacitors), feedthrough filters, hom chokes, los yog kev sib txuas ntawm cov no kom tau txais cov kev daws teeb meem zoo dua. Piv txwv li, hauv Monolithic EMI lim nrog lub suab nrov zoo dua hauv pob me me.
Thaum cov khoom siv hluav taws xob tau txais cov khoom siv hluav taws xob muaj zog, cov tsis xav tau tam sim no tuaj yeem raug cuam tshuam rau hauv Circuit Court thiab ua rau kev ua haujlwm tsis txaus ntseeg-los yog cuam tshuam rau kev ua haujlwm.
EMI / RFI tuaj yeem ua raws li kev ua haujlwm lossis hluav taws xob emissions. Thaum EMI ua tiav, nws txhais tau hais tias lub suab nrov nrov nrog cov khoom siv hluav taws xob. Thaum lub suab nrov yog propagated nyob rau hauv cov huab cua nyob rau hauv daim ntawv ntawm ib tug magnetic teb los yog xov tooj cua tsis, radiated EMI tshwm sim.
Txawm hais tias lub zog siv los ntawm sab nraud me me, yog tias nws sib xyaw nrog cov xov tooj cua tsis siv rau kev tshaj tawm thiab kev sib txuas lus, nws yuav ua rau kev txais tos tsis ua haujlwm, lub suab tsis zoo, lossis kev cuam tshuam video. Yog tias lub zog muaj zog heev, cov khoom siv hluav taws xob yuav raug puas tsuaj.
Cov chaw muaj xws li lub suab nrov (xws li hluav taws xob hluav taws xob, teeb pom kev zoo, thiab lwm yam) thiab cov suab nrov (xws li suab nrov, siv cov khoom siv hluav taws xob ntau, hluav taws xob tsis zoo, thiab lwm yam). Feem ntau, EMI / RFI suab nrov yog hom suab nrov, yog li kev daws teeb meem yog siv EMI cov ntxaij lim dej kom tshem tawm cov tsis xav tau ntau zaus raws li cov khoom sib cais lossis kos rau hauv lub rooj tsav xwm Circuit Court.
EMI lim EMI lim feem ntau yog tsim los ntawm passive Cheebtsam, xws li cov capacitors thiab inductors, uas txuas nrog rau hauv Circuit Court.
"Inductors tso cai rau DC lossis tsawg zaus tam sim no dhau mus, thaum thaiv cov teeb meem tsis zoo uas tsis xav tau tam sim no. Cov capacitors muab txoj hauv kev uas tsis tshua muaj kev cuam tshuam los hloov cov suab nrov nrov los ntawm cov tswv yim ntawm cov lim rov qab mus rau lub zog lossis hauv av kev sib txuas, "said Johanson Dielectrics Christophe Cambrelin hais tias lub tuam txhab ua ntau txheej ceramic capacitors thiab EMI lim.
Cov txheej txheem kev lim dej ib txwm muaj xws li cov lim dej qis uas siv cov capacitors uas dhau cov teeb liab nrog zaus qis dua qhov kev xaiv txiav tawm zaus thiab attenuate cov teeb liab nrog zaus siab tshaj qhov txiav tawm zaus.
Ib qho kev pib pib yog siv ob lub capacitors hauv qhov sib txawv ntawm qhov kev teeb tsa, siv lub capacitor ntawm txhua qhov kab thiab hauv av ntawm qhov sib txawv ntawm qhov sib txawv. Lub capacitor lim nyob rau hauv txhua ceg hloov EMI / RFI rau hauv av saum toj no qhov kev txiav tawm zaus. Txij li qhov kev teeb tsa no suav nrog kev xa cov teeb liab ntawm cov theem sib txawv los ntawm ob lub xov hlau, nws txhim kho lub teeb liab-rau-suab nrov piv thaum xa cov suab nrov tsis xav tau rau hauv av.
"Hmoov tsis zoo, tus nqi capacitance ntawm MLCCs nrog X7R dielectrics (feem ntau yog siv rau qhov kev ua haujlwm no) nws txawv nrog lub sijhawm, tsis zoo voltage, thiab kub," Cambrelin hais.
"Yog li txawm hais tias ob lub capacitors no tau zoo sib xws ntawm chav tsev kub thiab tsis tshua muaj hluav taws xob, ntawm lub sijhawm, ib zaug, lub sijhawm, qhov hluav taws xob, lossis qhov kub thiab txias hloov, lawv yuav xaus nrog qhov sib txawv heev. Qhov no ntawm ob kab Ib qho tsis sib haum yuav ua rau cov lus teb tsis sib xws nyob ze ntawm lub lim lim. Yog li ntawd, nws hloov cov suab nrov nrov rau hauv cov suab nrov sib txawv. "
Lwm qhov kev daws teeb meem yog txuas tus nqi loj "X" capacitor ntawm ob "Y" capacitor. Lub "X" capacitor shunt tuaj yeem muab cov txiaj ntsig zoo sib xws, tab sis yuav tsim cov teeb liab sib txawv tsis xav tau lim cov kev mob tshwm sim. Tej zaum qhov kev daws teeb meem tshaj plaws thiab lwm txoj hauv kev lim dej qis yog cov hom chokes.
Hom hom choke yog 1: 1 transformer uas ob qho tib si windings ua thawj thiab theem nrab. Nyob rau hauv txoj kev no, tam sim no dhau los ntawm ib qho winding induces qhov opposite tam sim no nyob rau hauv lwm winding. Hmoov tsis zoo, ntau hom chokes kuj hnyav, kim, thiab nquag ua tsis tiav los ntawm kev co.
Txawm li cas los xij, ib qho tsim nyog hom choke nrog zoo meej txuam thiab coupling ntawm windings yog pob tshab rau cov teeb liab sib txawv thiab muaj impedance siab rau hom suab nrov. Ib qho tsis zoo ntawm hom chokes feem ntau yog qhov tsawg zaus uas tshwm sim los ntawm cov kab mob parasitic capacitance. Rau cov khoom siv tseem ceeb, qhov siab dua qhov inductance siv kom tau txais kev lim dej qis dua, qhov ntau dua qhov yuav tsum tau ua thiab cov kab mob parasitic capacitance uas tuaj nrog nws, ua rau lub siab zaus lim dej tsis zoo.
Kev tsis sib haum xeeb hauv kev tsim cov khoom siv hluav taws xob sib txawv ntawm cov windings tuaj yeem ua rau kev hloov pauv hloov, nyob rau hauv uas ib feem ntawm lub teeb liab lub zog hloov dua siab tshiab rau hauv hom suab nrov, thiab vice versa. Qhov xwm txheej no yuav ua rau muaj teeb meem electromagnetic compatibility thiab tiv thaiv kab mob. Qhov kev tsis sib haum xeeb kuj txo qhov ua haujlwm zoo ntawm txhua ceg.
Txawm li cas los xij, thaum lub teeb liab sib txawv (dhau) ua haujlwm nyob rau hauv tib qhov ntau zaus raws li cov suab nrov hom uas yuav tsum tau txwv, hom hom choke muaj qhov zoo dua lwm yam kev xaiv. Siv hom hom chokes, lub teeb liab passband tuaj yeem txuas ntxiv mus rau hom hom nres.
Monolithic EMI cov ntxaij lim dej Txawm hais tias hom chokes yog nrov, lwm qhov ua tau yog monolithic EMI lim. Yog tias qhov kev teeb tsa tsim nyog, cov khoom siv sib xyaw ua ke no tuaj yeem muab cov suab nrov zoo sib xws. Lawv muab ob qho tib si sib npaug ntawm cov khoom sib luag hauv ib pob, uas muaj kev sib cuam tshuam inductance tshem tawm thiab tiv thaiv cov teebmeem. Cov ntxaij lim dej no siv ob txoj kev ywj pheej hluav taws xob hauv ib lub cuab yeej txuas nrog plaub qhov txuas sab nraud.
Txhawm rau tiv thaiv kev tsis sib haum xeeb, nws yuav tsum tau muab sau tseg tias cov lim dej monolithic EMI tsis yog ib txwm siv cov khoom siv hluav taws xob. Txawm hais tias lawv zoo tib yam ( tib lub pob thiab cov tsos), lawv cov qauv tsim txawv heev, thiab lawv txoj kev sib txuas kuj txawv. Zoo li lwm yam EMI cov ntxaij lim dej, lub lim dej monolithic EMI txo qis tag nrho lub zog siab tshaj qhov kev txiav tawm zaus, thiab tsuas yog xaiv lub teeb liab uas yuav tsum tau ua kom dhau, thaum hloov lub suab tsis xav tau mus rau "hauv av".
Txawm li cas los xij, tus yuam sij yog inductance tsawg heev thiab sib phim impedance. Rau lub lim dej monolithic EMI, lub davhlau ya nyob twg txuas nrog rau cov khoom siv (shielding) electrode nyob rau hauv lub cuab yeej, thiab lub rooj tsavxwm yog sib cais los ntawm kev siv electrode. Nyob rau hauv cov nqe lus ntawm hluav taws xob zoo li qub, peb lub tshuab hluav taws xob yog tsim los ntawm ob lub capacitive halves, uas qhia ib qho kev siv electrode, tag nrho cov siv electrodes muaj nyob rau hauv ib lub cev ceramic.
Qhov sib npaug ntawm ob qho tib si ntawm lub capacitor kuj txhais tau hais tias cov teebmeem piezoelectric sib npaug thiab sib npaug, tshem tawm ib leeg tawm. Qhov kev sib raug zoo no tseem cuam tshuam rau kev hloov pauv ntawm qhov kub thiab qhov hluav taws xob, yog li cov khoom ntawm ob kab muaj qhov sib npaug ntawm kev laus. Yog tias cov lim dej monolithic EMI no muaj qhov tsis zoo, lawv tsis tuaj yeem siv yog tias lub suab nrov hom yog tib zaus raws li qhov sib txawv ntawm cov teeb liab. Cambrelin tau hais tias "Qhov no, ib qho kev sib koom ua ke yog kev daws teeb meem zoo dua," Cambrelin hais.
Xauj qhov tseeb qhov teeb meem ntawm Tsim Ntiaj Teb thiab cov teeb meem yav dhau los hauv ib qho yooj yim-rau-siv, hom ntawv zoo. Kho kom raug, sib qhia thiab rub tawm tam sim nrog cov ntawv xov xwm tsim qauv tsim qauv.
Lub ntiaj teb cov teeb meem saum toj kawg nkaus daws teeb meem EE lub rooj sib tham, npog microcontrollers, DSP, kev sib txuas lus, analog thiab digital tsim, RF, hluav taws xob hluav taws xob, PCB thaiv, thiab lwm yam.
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