Hloov Cov Khoom Siv Hluav Taws Xob EMI Technology Hloov Channel
Hloov Cov Khoom Siv Hluav Taws Xob EMI Technology Transmission Channel
(Kuv). Ua haujlwm cuam tshuam kis tau tus mob channel
(1) capacitive coupling
(2) Inductive coupling
(3) Resistive coupling
ib. Resistive conductive coupling generated los ntawm lub internal kuj ntawm cov pej xeem fais fab mov
b. Resistive conductive coupling generated los ntawm pej xeem av impedance
c. Resistive conductive coupling generated los ntawm cov kab impedance
Hloov fais fab mov EMI thev naus laus zis
(1) Txo dv / dt thiab di / dt (txo nws cov nqi siab tshaj, qeeb nws txoj kab nqes)
(2) Kev tsim nyog thov ntawm varistors kom txo tau qhov hluav taws xob surge
(3) damping network los suppress overshoot
(4) kev siv cov yam ntxwv zoo rov qab los ntawm diode kom txo cov zaus band EMI
(5) kev kho lub zog zoo, thiab lwm yam kev kho kom haum xeeb
(6) siv cov lim fais fab uas tsim nyog
(7) Tsim nyog grounding
(8) Kev tiv thaiv kev tiv thaiv zoo
(9) tsim nyog pCB tsim
Hloov fais fab mov EMI thev naus laus zis qhov chaw cuam tshuam
(1) Lub zog hloov lub raj
Lub hwj chim hloov raj ua haujlwm hauv On-Off ceev lub voj voog hloov pauv lub xeev, dv / dt thiab di / dt yog nyob rau hauv kev hloov pauv sai, yog li ntawd, lub hwj chim hloov raj yog ob qho tib si hluav taws xob sib txuas ntawm qhov tseem ceeb ntawm kev cuam tshuam, tab sis kuj muaj cov hlau nplaum. teb coupling ntawm lub ntsiab qhov chaw ntawm kev cuam tshuam.
(2)
EMI qhov chaw ntawm lub high-frequency transformer yog concentrated nyob rau hauv lub ceev cyclic transformation ntawm di / dt coj mus rau lub to inductance, yog li lub high-frequency transformer yog ib qho tseem ceeb cuam tshuam qhov chaw ntawm magnetic teb coupling.
(3) Rectifier diode
EMI qhov chaw ntawm rectifier diode yog concentrated nyob rau hauv lub rov qab cov yam ntxwv, thiab lub intermittent point ntawm reverse rov qab tam sim no yuav ua rau siab dv / dt nyob rau hauv inductance (lead inductance, stray inductance, thiab lwm yam), uas ua rau muaj zog electromagnetic cuam tshuam.
(4) PEB
Kom meej meej, pCB yog qhov sib txuas ntawm cov kev cuam tshuam saum toj no, thiab qhov txiaj ntsig ntawm pCB ncaj qha cuam tshuam rau qhov zoo lossis qhov tsis zoo ntawm qhov saum toj no EMI qhov chaw.
Kev tswj cov dej xau inductance ntawm high zaus transformer
Cov xau inductance ntawm high-frequency transformer yog ib qho ntawm cov laj thawj tseem ceeb rau kev tsim hluav taws xob hloov hluav taws xob hluav taws xob, yog li ntawd, kev tswj cov hluav taws xob inductance tau dhau los ua thawj qhov teeb meem uas yuav tsum tau ntsib hauv kev daws teeb meem EMI coj los ntawm high-frequency transformer.
Txo cov xau inductance ntawm high zaus transformer ob lub ntsiab lus nkag: hluav taws xob tsim, txheej txheem tsim!
(1) xaiv cov tub ntxhais txoj cai, txo cov xau inductance. Leakage inductance yog proportional rau lub square ntawm tus naj npawb ntawm lem nyob rau hauv thawj sab, txo tus naj npawb ntawm lem yuav ho txo qhov to inductance.
(2) Txo cov txheej rwb thaiv tsev ntawm cov windings. Tam sim no muaj ib hom insulating txheej hu ua "kub zaj duab xis", lub thickness ntawm 20 ~ 100um, mem tes tawg voltage mus txog ob peb txhiab volts.
(3) ua kom cov coupling ntawm cov windings, txo qhov to inductance.
