這張是L相.
這張為N相.漂亮MM請(qǐng)各位高手幫忙看看,電源傳導(dǎo)不過(guò),要如何改進(jìn)?
電源的輸入為220VAC,輸出為+-15、24、5VDC.傳導(dǎo)在1M前和8M左右均超標(biāo),不知道要采用什么措施可以控制,請(qǐng)各位大俠請(qǐng)點(diǎn)一二,非常感謝!這張是L相.
這張為N相.
這張是L相.
這張為N相.全部回復(fù)(17)
正序查看
倒序查看
Looks like, this is a switching power supply, the "bad" frequency" from your pic are 160K, 320K and around 640K. They're narrow Band. I guess your primary switching freq is around 80K or 160K. Thus, you need to improve your primary design to kill this low freq spur. Without Schematic, I don't know how to improve it.As far as the 8MHz, it is wide band, try to use a larger common choke at AC input side, and see if it works.
0
回復(fù)
@xiang_97124
Lookslike,thisisaswitchingpowersupply,the"bad"frequency"fromyourpicare160K,320Kandaround640K.They'renarrowBand.Iguessyourprimaryswitchingfreqisaround80Kor160K.Thus,youneedtoimproveyourprimarydesigntokillthislowfreqspur.WithoutSchematic,Idon'tknowhowtoimproveit.Asfarasthe8MHz,itiswideband,trytousealargercommonchokeatACinputside,andseeifitworks.
謝謝高手指點(diǎn),我先試試.非常感謝!
0
回復(fù)
看你的電壓騷擾測(cè)試結(jié)果,除共模外,差模也成問(wèn)題,如果從這張表數(shù)據(jù)看你需要加一個(gè)差模電感,電感量大約是你變壓器原邊電感量的1/20(鐵粉芯材料) 和一個(gè)0.1~0.47u/630v的CBB20或CBB21的薄膜電容,如果你的開(kāi)關(guān)電源是采用的功率開(kāi)關(guān)器件且散熱器是接保護(hù)地(PE)的,那么需要你再加一個(gè)共模扼流圈和兩個(gè)濾共模干擾的Y電容2200P~4700P/250V AC.當(dāng)然以上是常規(guī)設(shè)計(jì).如果你想節(jié)約成本,可把你的電路傳給我,我會(huì)幫你看看有沒(méi)有低成本的EMC處理方案.
0
回復(fù)
@rojes
看你的電壓騷擾測(cè)試結(jié)果,除共模外,差模也成問(wèn)題,如果從這張表數(shù)據(jù)看你需要加一個(gè)差模電感,電感量大約是你變壓器原邊電感量的1/20(鐵粉芯材料)和一個(gè)0.1~0.47u/630v的CBB20或CBB21的薄膜電容,如果你的開(kāi)關(guān)電源是采用的功率開(kāi)關(guān)器件且散熱器是接保護(hù)地(PE)的,那么需要你再加一個(gè)共模扼流圈和兩個(gè)濾共模干擾的Y電容2200P~4700P/250VAC.當(dāng)然以上是常規(guī)設(shè)計(jì).如果你想節(jié)約成本,可把你的電路傳給我,我會(huì)幫你看看有沒(méi)有低成本的EMC處理方案.
謝謝這位大哥,呵...我先試試看,如果再不行,就傳給你幫我看看!
0
回復(fù)
