EMI tiv thaiv kev ntsuas thaum tsim cov khoom siv hluav taws xob hloov

1. Tsawg kawg ntawm PCB tooj liab ntawv ci cheeb tsam ntawm lub suab nrov Circuit Court node mus rau qhov siab tshaj plaws; Xws li cov kav dej hloov pauv, cov khoom siv hluav taws xob, cov khoom siv hluav taws xob, thiab lwm yam.

2. Khaws cov tswv yim thiab cov khoom tso tawm kom deb ntawm lub suab nrov, xws li transformer coil, transformer magnetic core, heat sink of switch tube, thiab lwm yam.

3. Khaws lub suab nrov (xws li lub tshuab hluav taws xob tsis muaj hluav taws xob, lub tshuab hluav taws xob tsis muaj hluav taws xob, thiab lub raj hloov pauv, thiab lwm yam) kom deb ntawm lub qhov rooj kaw vim tias lub qhov rooj kaw yuav nyob ze rau ntawm cov xaim hauv av sab nraud hauv kev ua haujlwm ib txwm muaj.

4. Yog tias lub tshuab hluav taws xob tsis siv hluav taws xob tiv thaiv hluav taws xob, khaws cov ntaub thaiv npog thiab lub tshuab hluav taws xob kom deb ntawm lub transformer.

5. Txo qhov cheeb tsam ntawm lub voj tam sim no: theem nrab (tso zis) rectifier, thawj lub tshuab hluav taws xob hloov hluav taws xob, kab hluav taws xob (hauv paus) tsav kab, pab rectifier.

6. Tsis txhob sib tov lub rooj vag (pem hauv paus) tsav cov lus tawm tswv yim nrog lub hauv paus hloov hluav taws xob lossis lub koom haum rectifier Circuit Court.

7. Kho thiab optimize qhov damping kuj tus nqi kom nws tsis tsim ringing nyob rau hauv lub sij hawm tuag ntawm qhov hloov.

8. Tiv thaiv EMI filtering inductance saturation.

9. Khaws cov xaim xaim thiab cov khoom nruab nrab ntawm lub voj voog kom deb ntawm cov ntaub thaiv npog thawj lossis cov dab dej kub ntawm lub raj hloov.

10. Khaws cov oscillating nodes thiab cov khoom ntawm lub hauv paus Circuit Court deb ntawm daim ntaub thaiv npog los yog radiator.

11. Khaws lub lim EMI ntawm cov khoom siv ntau zaus ze rau ntawm cov khoom siv hluav taws xob lossis cov khoom txuas kawg.

12. Khaws lub lim EMI ntawm cov zis ntau zaus ze rau ntawm qhov tso zis hlau davhlau ya nyob twg.

13. Khaws qhov kev ncua deb ntawm cov ntawv ci tooj liab ntawm PCB phaj tawm tsam EMI lim thiab lub cev tiv thaiv.

Muab qee qhov kev tawm tsam ntawm txoj kab ntawm lub rectifier rau lub auxiliary coil.

15. Parallel damping kuj ntawm magnetic pas nrig coil.

16. Parallel damping kuj ntawm ob qhov kawg ntawm cov zis RF lim.

17. 1nF / 500v ceramic capacitors tau tso cai rau hauv PCB tsim los yog tej zaum yuav yog ib tug series ntawm resistances, uas yog bonded ntawm thawj static kawg ntawm lub transformer thiab lub auxiliary windings.

18. Khaws EMI lim kom deb ntawm lub hwj chim transformer; Tshwj xeeb, tsis txhob muab tso rau ntawm qhov kawg ntawm qhov qhwv.

19. Nyob rau hauv cov ntaub ntawv ntawm txaus cheeb tsam ntawm PCB, tus pin txoj hauj lwm rau lub shielding winding thiab txoj hauj lwm ntawm RC damper tuaj yeem tso rau ntawm PCB, thiab RC damper tuaj yeem txuas rau ntawm ob qho kawg ntawm kev tiv thaiv winding.

20. Yog hais tias qhov chaw tso cai, tso ib tug footpath ua capacitor (miller capacitance, 10 pico / 1 kv capacitance) nruab nrab ntawm lub ntws thiab lub rooj vag ntawm lub switching power field effect tube.

Muab RC damper me me ntawm dc tso zis yog tias qhov chaw tso cai.

Tsis txhob tso lub qhov hluav taws xob AC tawm tsam lub dab dej kub ntawm lub taub hloov lub raj.