Dab tsi yog cov kev ntsuas los tiv thaiv EMI hauv kev tsim cov khoom siv hluav taws xob hloov
1MHZ -5MHZ - Qhov sib txawv hom hom sib xyaw sib xyaw, siv cov tswv yim thiab cov X capacitors los lim tawm qhov sib txawv cuam tshuam thiab txheeb xyuas qhov cuam tshuam dab tsi tshaj li tus qauv thiab daws nws; 5M - saum toj no feem ntau yog siv co kov cuam tshuam thiab siv txoj hauv kev los tiv thaiv co kov. Rau cov ntaub ntawv hauv av, siv lub nplhaib sib nqus rau 2 tig rau hauv av xaim yuav muaj qhov cuam tshuam loj ntawm kev cuam tshuam saum 10MHz (didiu 2006); Rau 25-30MHz, nws muaj peev xwm ua kom cov Y capacitance rau hauv av, qhwv ib daim tawv tooj liab sab nraum lub transformer, hloov PCBLAYOUT, thiab txuas ib lub nplhaib me me nrog ob lub xaim winding nyob rau hauv pem hauv ntej ntawm cov zis kab, nrog tsawg kawg yog 10 lem, thiab nruab ib lub RC lim ntawm ob qho kawg ntawm cov zis rectifier raj.
30-50MHZ feem ntau yog tshwm sim los ntawm kev kub ceev qhib thiab kaw ntawm MOS transistors, uas tuaj yeem daws tau los ntawm kev nce MOS tsav tsis kam, siv 1N4007 qeeb transistors rau RCD tsis circuits, thiab 1N4007 qeeb transistors rau VCC fais fab mov voltage.
100-200MHz feem ntau yog tshwm sim los ntawm qhov rov qab rov qab tam sim no ntawm cov zis rectifier raj, thiab cov hlaws sib nqus tuaj yeem raug strung ntawm lub raj rectifier
Feem ntau ntawm cov zaus ntawm 100MHz thiab 200MHz yog vim PFCMOSFET thiab PFC diodes. Niaj hnub no, MOSFET thiab PFC diode txoj hlua hlau nplaum muaj qhov cuam tshuam, 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 ntawm cov khoom siv hluav taws xob hloov feem ntau tsuas yog cuam tshuam cov zaus band hauv qab 100M. Nws kuj tseem tuaj yeem ntxiv cov khoom sib nqus nqus ntawm MOS thiab diodes, tab sis qhov ua tau zoo yuav raug txo.
Kev ntsuas los tiv thaiv EMI thaum tsim cov khoom siv hluav taws xob hloov pauv
1. Ua kom tsawg kawg ntawm PCB tooj liab ntawv ci cheeb tsam ntawm lub suab nrov Circuit Court nodes kom loj tshaj qhov ua tau; Xws li cov dej ntws thiab cov khoom siv ntawm lub raj hloov, cov nodes ntawm thawj winding, thiab lwm yam.
2. Khaws cov tswv yim thiab cov khoom tso tawm kom deb ntawm cov khoom nrov nrov xws li cov khoom siv hluav taws xob hloov hluav taws xob, cov khoom siv hluav taws xob, cov hluav taws xob hluav taws xob, cov hluav taws kub dissipation fins ntawm cov raj hloov, thiab lwm yam.
3. Khaws cov khoom nrov nrov (xws li cov pob khoom 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 lub qhov rooj kaw, vim tias ntug ntawm lub qhov rooj kaw yuav nyob ze rau cov xaim hauv av sab nraud raws li 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 lub cev thiab cov cua sov dissipation fins deb ntawm lub transformer.
5. Txo cov cheeb tsam ntawm cov voj voog tam sim no kom ntau li ntau tau: cov khoom siv hluav taws xob theem nrab (tso zis) rectifiers, thawj cov khoom siv hluav taws xob hloov hluav taws xob, lub rooj vag (hauv paus) tsav circuits, thiab cov khoom siv hluav taws xob.
6. Tsis txhob sib xyaw cov lus tawm tswv yim ntawm lub rooj vag (piv txwv) nrog lub hauv paus hloov hluav taws xob lossis lub koom haum rectifier Circuit Court.
7. Kho thiab ua kom zoo dua tus nqi damping kuj kom nws tsis tsim lub suab nrov thaum lub sijhawm tuag ntawm qhov hloov.
8. Tiv thaiv EMI filtering inductance saturation.
9. Khaws cov bending nodes thiab cov khoom ntawm lub thib ob Circuit Court deb ntawm lub shielding lub cev ntawm lub hauv paus Circuit Court los yog lub tshav kub dab dej ntawm lub hloov raj.
10. Khaws lub viav vias nodes thiab cov khoom siv ntawm lub hauv paus Circuit Court kom deb ntawm kev tiv thaiv los yog cov cua kub dissipation fins.
11. Muab lub tshuab lim EMI rau cov khoom siv ntau zaus ze rau ntawm cov khoom siv hluav taws xob lossis cov khoom txuas kawg.
12. Khaws lub lim EMI nrog cov zis ntau zaus ze rau ntawm qhov tso zis hlau davhlau ya nyob twg.
13. Khaws ib qho kev ncua deb ntawm cov ntawv ci tooj liab ntawm lub rooj tsav xwm PCB tawm tsam EMI lim thiab lub cev tiv thaiv.
14. Muab ib co resistors rau ntawm lub rectifier Circuit Court auxiliary coil.
15. Txuas damping resistors nyob rau hauv parallel ntawm lub magnetic pas nrig coil.
16. Txuas damping resistors nyob rau hauv parallel ntawm ob qhov kawg ntawm cov zis RF lim.
17. Hauv PCB tsim, nws tso cai rau tso 1nF / 500V ceramic capacitors los yog ib tug series ntawm resistors, uas yuav tsum tau kev cob cog rua ntawm tus 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 lub wrapping.
19. Thaum lub PCB cheeb tsam txaus, ib tug ko taw txoj hauj lwm rau tso lub shielding winding thiab ib txoj hauj lwm rau tso lub RC damper tuaj yeem tso rau ntawm PCB. Lub RC damper tuaj yeem txuas nrog hla ob qhov kawg ntawm kev tiv thaiv winding.
20. Yog tias qhov chaw tso cai, tso ib lub me me radial lead capacitor (Miller capacitor, 10 pF / 1kV capacitor) nruab nrab ntawm qhov ntws thiab lub rooj vag ntawm qhov hloov hluav taws xob teb-tshuaj cuam tshuam transistor.
21. Yog tias qhov chaw tso cai, tso ib lub RC damper me me ntawm DC tso zis kawg.
22. Tsis txhob ntswj lub qhov (socket) AC tiv thaiv lub dab dej kub ntawm lub raj hloov thawj.
