開關(guān)電源印刷電路板電磁兼容問題的研究
STUDY IN ELECTROMAGNETIC COMPATIBILITY ON PRINTED CIRCUIT BOARD OF SWITCHING POWER SUPPLY
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摘要: 印刷線路間的串?dāng)_問題是影響開關(guān)電源傳導(dǎo)干擾水平的主要因素之一,而旨在降低串?dāng)_水平的布線設(shè)計卻一直是設(shè)計中難點。本文提出了一種基于電場分析的開關(guān)電源印刷電路板EMC輔助設(shè)計的思想方法,其基本思想是以干擾強度分布圖為參考選擇布線區(qū)域,以耦合系數(shù)的實時計算結(jié)果為指導(dǎo)及時調(diào)整布線設(shè)計,幫助工程師在印刷線路板的設(shè)計階段就把潛在的干擾抑制在盡可能低的水平上。計算和實驗的結(jié)果證實了這種思想的可行性。
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關(guān)鍵詞:
- 電磁干擾; 串?dāng)_; 印刷線路板; 布線設(shè)計; 開關(guān)電源
Abstract: Crosstalk between conductor traces on printed circuit board is one primary source of EMI in switching power supply.Field analysis is carried out to study the electric field on PCB.Simulation and measured emission map offer valuable visual aids to PCB designer,coupling index is introduced to indicate coupling level between two traces.Based on these emission maps and coupling index PCB designer can arrange critical trace in suitable location,so crosstalk problem between traces can be suppressed during PCB design stage. -
關(guān)于對六種進口產(chǎn)品實施電磁兼容強制檢測的通知,國家出入境檢驗檢疫局和對外經(jīng)濟貿(mào)易合作部聯(lián)合下達,1999年1月.[2]L.B.Gravelle,P.F.Wilson,EMI/EMC in printed circuit boardA literature review,IEEE Trans.on Electromagnetic Compatibility,1992,34(2),109-116.[3]Bogatin Eric,Design rules for microstrip capacitance,IEEE Trans.on Components,Hybrids and Manufacturing Technology,1988,11(3),166-173.[4]M.H.Pong.[J].C.M.Lee,X.Wu,EMI due to electric field coupling on PCB, Proc.of IEEE PESC98 Fukuoka,Japan.1209,1998:-[5]Zhang Wei,M.T.Zhang,F.C.Lee,Conducted EMI analysis of a boost PFC circuit,Proc.of IEEE PESC97,USA,1997,223-229.[6]Giulio Antonini,Saverio Cristina, Antonini Orlandi,EMC characterization of SMPS devices:Circuit and radiated emission model, IEEE Trans.on Electromagnetic Compatibility,1996,38(3),300-309. -
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