Dab tsi yog cov kev ntsuas los tiv thaiv EMI hauv kev tsim cov khoom siv hluav taws xob hloov hluav taws xob
Raws li lub zog hloov hluav taws xob ua haujlwm hauv lub xeev hloov pauv, qhov hloov pauv tam sim no thiab qhov hloov pauv ntawm cov khoom siv hluav taws xob hloov pauv tau siab heev, thiab qhov cuam tshuam siv hluav taws xob yog qhov loj; cov kev cuam tshuam cov kev cuam tshuam feem ntau yog tsom rau lub sijhawm hloov hluav taws xob thiab lub tshuab hluav taws xob thiab lub tshuab hluav taws xob siab txuas nrog nws. Muab piv nrog cov digital Qhov chaw ntawm qhov cuam tshuam hauv Circuit Court yog qhov tseeb; qhov hloov zaus tsis siab (los ntawm kaum ntawm kilohertz mus rau ob peb megahertz), thiab cov ntaub ntawv tseem ceeb ntawm kev cuam tshuam yog kev cuam tshuam kev cuam tshuam thiab kev cuam tshuam ze ntawm thaj chaw; Thaum luam tawm Circuit Board (PCB) thaiv feem ntau yog manually wired, Nws muaj ntau dua arbitrariness, uas ua rau kom cov teeb meem ntawm extracting PCB faib tsis thiab kwv yees nyob ze-field cuam tshuam.
Tsis pub dhau 1MHZ - feem ntau sib txawv hom cuam tshuam, uas tuaj yeem daws tau los ntawm kev nce X capacitor
1MHZ---5MHZ--- hom sib txawv thiab hom sib xyaw ua ke, siv lub davhlau ya nyob twg nkag thiab cov X capacitors los lim tawm cov kev cuam tshuam sib txawv thiab txheeb xyuas qhov kev cuam tshuam dab tsi tshaj li tus qauv thiab daws nws; 5M---cov lus saum toj no feem ntau yog cuam tshuam, siv txoj hauv kev los tiv thaiv kev sib chwv. Rau rooj plaub hauv av, siv lub nplhaib sib nqus rau hauv av xaim rau 2 lem yuav ua rau muaj kev cuam tshuam ntau dua 10MHZ (diudiu2006); rau 25--30MHZ, koj tuaj yeem siv Y capacitor loj dua rau hauv av thiab qhwv cov tawv nqaij ntawm sab nraud ntawm lub tshuab hloov pauv, Hloov PCBLAYOUT, txuas lub nplhaib sib nqus me me nrog ob lub xov hlau sib luag nyob rau hauv pem hauv ntej ntawm cov zis kab, tsawg kawg 10 lem , thiab txuas lub RC lim ntawm ob qho kawg ntawm cov zis rectifier raj.
30---50MHZ feem ntau yog tshwm sim los ntawm kev kub ceev tig thiab tig tawm ntawm MOS raj. Nws tuaj yeem daws tau los ntawm kev ua kom MOS tsav tsis kam, siv 1N4007 cov raj qeeb rau RCD tsis siv hluav taws xob, thiab siv 1N4007 cov raj qeeb rau VCC cov khoom siv hluav taws xob.
100---200MHZ feem ntau yog tshwm sim los ntawm qhov rov qab rov qab tam sim no ntawm cov zis rectifier, koj tuaj yeem hlua cov hlaws sib nqus ntawm lub rectifier
Ntawm 100MHz thiab 200MHz, feem ntau ntawm lawv yog PFC MOSFETs thiab PFC diodes. Tam sim no MOSFETs thiab PFC diodes tau ua haujlwm zoo, thiab cov kev taw qhia kab rov tav tuaj yeem daws qhov teeb meem, tab sis cov kev taw qhia ntsug yog qhov tsis muaj txiaj ntsig.
Cov hluav taws xob hloov hluav taws xob feem ntau tsuas yog cuam tshuam cov zaus band hauv qab 100M. Nws kuj tseem tuaj yeem ntxiv qhov sib nqus nqus Circuit Court ntawm MOS thiab diode, tab sis qhov ua tau zoo yuav raug txo.
Kev ntsuas los tiv thaiv EMI thaum tsim hluav taws xob hloov pauv
1. Tsawg kawg ntawm PCB tooj liab ntawv ci cheeb tsam ntawm lub suab nrov Circuit Court nodes; xws li cov dej ntws thiab cov khoom siv hluav taws xob hloov pauv, cov nodes ntawm thawj thiab theem nrab windings, thiab lwm yam.
2. Khaws cov tswv yim thiab cov khoom tso tawm kom deb ntawm cov khoom tsis muaj suab nrov, xws li cov khoom siv hluav taws xob hloov hluav taws xob, cov khoom siv hluav taws xob hloov hluav taws xob, cov khoom siv hluav taws xob hloov hluav taws xob, thiab lwm yam.
3. Khaws cov khoom tsis muaj suab nrov (xws li cov khoom siv hluav taws xob tsis muaj hluav taws xob tsis muaj hluav taws xob, cov khoom siv hluav taws xob tsis muaj hluav taws xob, thiab cov raj hloov hluav taws xob, thiab lwm yam) kom deb ntawm ntug ntawm rooj plaub, vim tias ntug ntawm rooj plaub yuav nyob ze rau sab nraud hauv av xaim nyob rau hauv ib txwm muaj. kev ua haujlwm.
4. Yog tias lub tshuab hluav taws xob tsis siv hluav taws xob tiv thaiv hluav taws xob, khaws cov ntaub thaiv npog thiab cov dab dej kub kom deb ntawm lub transformer.
5. Txo thaj tsam ntawm cov voj voog tam sim no: theem nrab (tso zis) rectifier, thawj lub zog hloov hluav taws xob, lub rooj vag (hauv paus) tsav kab, pab rectifier.
6. Tsis txhob sib tov lub rooj vag (pem hauv ntej) tsav cov lus tawm tswv yim nrog cov thawj hloov hluav taws xob los yog cov khoom siv kho kom haum.
7. Kho qhov zoo tshaj plaws damping resistor tus nqi kom nws tsis tsim lub suab nrov thaum lub sij hawm tuag ntawm qhov hloov.
8. Tiv thaiv EMI lim inductor saturation.
9. Khaws lub voj voog thiab cov khoom ntawm lub voj voog thib ob kom deb ntawm cov ntaub thaiv npog ntawm thawj lub voj voog lossis lub dab dej kub ntawm lub raj hloov.
10. Khaws lub viav vias nodes thiab lub cev ntawm lub hauv paus Circuit Court kom deb ntawm cov ntaub thaiv npog lossis cov dab dej kub.
11. Ua lub lim EMI rau cov khoom siv ntau zaus nyob ze rau ntawm cov khoom siv cable lossis cov khoom txuas kawg.
12. Khaws lub lim EMI kom muaj qhov tso zis ntau zaus ze rau cov khoom siv hluav taws xob tso tawm.
13. Khaws ib qho kev ncua deb ntawm cov ntawv ci tooj liab ntawm PCB tawm tsam EMI lim thiab lub cev tiv thaiv.
14. Muab ib co resistors nyob rau hauv kab ntawm lub rectifier rau lub auxiliary coil.
15. Txuas lub damping resistor nyob rau hauv parallel ntawm lub kauj ntawm tus pas nrig sib nqus.
16. Txuas damping resistors nyob rau hauv parallel hla cov zis RF lim.
17. Nws tso cai rau tso 1nF/500V ceramic capacitors los yog ib tug series ntawm resistors nyob rau hauv lub PCB tsim, thiab txuas lawv ntawm thawj static kawg ntawm lub transformer thiab lub auxiliary winding.
18. Khaws lub lim EMI kom deb ntawm lub hwj chim transformer; tshwj xeeb tshaj yog tsis txhob muab tso rau ntawm qhov kawg ntawm winding.
19. Yog tias thaj tsam PCB txaus, cov pins rau cov ntaub thaiv npog winding thiab txoj hauj lwm rau RC damper tuaj yeem tso rau ntawm PCB, thiab RC damper tuaj yeem txuas nrog hla ob qhov kawg ntawm daim thaiv thaiv winding.
20. Yog tias qhov chaw tso cai, tso ib lub me me radial lead capacitor (Miller, 10 pF / 1 kV) ntawm qhov ntws thiab lub rooj vag ntawm lub zog hloov MOSFET.
21. Muab RC damper me me rau ntawm DC tso zis yog tias qhov chaw tso cai.
22. Tsis txhob muab AC lub qhov (socket) ze rau ntawm lub dab dej kub ntawm lub qhov hluav taws xob hloov pauv.
