Dab tsi yog kev ntsuas los tiv thaiv EMI hauv kev hloov hluav taws xob tsim hluav taws xob?
Tsis pub dhau 1MHZ---- feem ntau yog qhov sib txawv ntawm kev cuam tshuam, uas tuaj yeem daws tau los ntawm kev nce X capacitance
1MHZ---5MHZ--- hom sib txawv thiab hom sib xyaw ua ke, siv lub davhlau ya nyob twg input thiab ib series ntawm X capacitors los lim tawm qhov sib txawv hom cuam tshuam thiab txheeb xyuas qhov cuam tshuam tshaj li tus qauv thiab daws nws; 5M---thiab saum toj no yog hom kev cuam tshuam feem ntau, txais yuav txoj kev txwv kev sib koom tes. Rau lub plhaub uas yog hauv av, siv cov hlau nplaum los puag ncig hauv av xaim rau 2 lem yuav ua rau muaj kev cuam tshuam ntau dua 10MHZ (diudiu2006); rau 25--30MHZ, koj tuaj yeem nce Y capacitance rau hauv av thiab qhwv tooj liab ncig lub transformer. , hloov PCBLAYOUT, txuas lub nplhaib me me nrog ob lub xov hlau nyob rau hauv pem hauv ntej ntawm cov zis kab, cua nws tsawg kawg yog 10 lem, thiab txuas 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 raj. Nws tuaj yeem daws tau los ntawm kev nce MOS tsav tsheb tsis kam, siv 1N4007 qeeb raj rau RCD tsis Circuit Court, thiab siv 1N4007 qeeb raj rau VCC muab 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 ua cov hlua hlau nplaum ntawm lub rectifier.
Feem ntau ntawm cov teeb meem ntawm 100MHz thiab 200MHz yog tshwm sim los ntawm PFCMOSFET thiab PFC diodes. Tam sim no MOSFET thiab PFC diode hlua hlaws tau zoo. Txoj kev taw qhia kab rov tav tuaj yeem daws qhov teeb meem, tab sis txoj 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. Qhov sib thooj nqus cov voj voog kuj tuaj yeem ntxiv rau 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. 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 dab dej kub ntawm cov raj hloov, thiab lwm yam.
3. Khaws cov khoom tsis muaj suab nrov (xws li cov khoom siv hluav taws xob tsis muaj hluav taws xob, cov khoom siv hluav taws xob tsis muaj hluav taws xob, thiab cov raj hloov pauv, thiab lwm yam) kom deb ntawm ntug ntawm lub casing, vim hais tias nyob rau hauv ib txwm ua hauj lwm lub ntug ntawm lub casing yuav nyob ze rau sab nraum av. hlau.
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 tshuab hluav taws xob hloov hluav taws xob, lub rooj vag (hauv paus) tsav Circuit Court, thiab pab rectifier.
6. Tsis txhob sib tov lub rooj vag (pem hauv ntej) tsav cov lus tawm tswv yim lub voj voog nrog cov thawj hloov hluav taws xob lossis lub koom haum rectifier circuit.
7. Kho thiab optimize qhov 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 ntawm lub voj voog thiab 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 hauv paus ntawm lub viav vias viav vias thiab cov khoom siv lub cev kom deb ntawm cov ntaub thaiv npog lossis cov dab dej kub.
11. Muab lub siab-frequency input EMI lim ze rau ntawm lub input cable los yog connector kawg.
12. Khaws cov zis ntau zaus EMI lim ze rau cov zis hlau terminals.
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 qee cov resistors rau ntawm cov kab ntawm lub rectifier ntawm cov auxiliary coil.
15. Txuas lub damping resistor nyob rau hauv parallel mus rau lub magnetic pas nrig coil.
16. Txuas damping resistors nyob rau hauv parallel hla cov zis RF lim.
17. Thaum tsim lub PCB, nws raug tso cai tso 1nF / 500V ceramic capacitor los yog cov resistors nyob rau hauv qhov kawg ntawm qhov zoo li qub ntawm lub hauv paus ntawm lub transformer thiab cov auxiliary winding.
18. Khaws EMI lim kom deb ntawm lub hwj chim transformers; tshwj xeeb tshaj yog tsis txhob muab tso rau ntawm qhov kawg ntawm qhov qhwv.
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. Lub RC damper tuaj yeem txuas nrog hla ob qhov kawg ntawm daim ntaub thaiv npog.
20. Yog tias qhov chaw tso cai, tso ib lub me me radial lead capacitor (Miller capacitor, 10 pF / 1 kV capacitance) ntawm qhov ntws thiab lub rooj vag ntawm lub zog hloov FET.
21. Yog tias qhov chaw tso cai, tso lub RC damper me me ntawm DC tso zis.
22. Tsis txhob tso lub qhov (socket) AC thiab lub dab dej kub ntawm lub qhov hluav taws xob hloov lub raj nyob ze ua ke.
