幵關(guān)電源倍頻點(diǎn)EMC超出
幵關(guān)電源在EMI測試時(shí),160M-170M超出,可以知道是倍頻點(diǎn),改變頻率可PASS,大家可討論一下, 解決這方面EMI的方法.
幵關(guān)電源倍頻點(diǎn)EMC超出
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Radiation solution
For 160M~180M band width, the root cause can be analysis as following:
1. Grounding impedance too high, you need to improve it.
2. Check the Vds spike, if the first spike is about 40M, 160M~170M should be fail, I just solve one project fail in this band width, so you can try it, I just adjusted clamper.
For 160M~180M band width, the root cause can be analysis as following:
1. Grounding impedance too high, you need to improve it.
2. Check the Vds spike, if the first spike is about 40M, 160M~170M should be fail, I just solve one project fail in this band width, so you can try it, I just adjusted clamper.
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@arthur.deng
RadiationsolutionFor160M~180Mbandwidth,therootcausecanbeanalysisasfollowing:1.Groundingimpedancetoohigh,youneedtoimproveit.2.ChecktheVdsspike,ifthefirstspikeisabout40M,160M~170Mshouldbefail,Ijustsolveoneprojectfailinthisbandwidth,soyoucantryit,Ijustadjustedclamper.
Vds spike
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@r00778
Vdsspike[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/0/1077518452.bmp');}"onmousewheel="returnimgzoom(this);">[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/0/1077518526.bmp');}"onmousewheel="returnimgzoom(this);">[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/0/1077518591.bmp');}"onmousewheel="returnimgzoom(this);">[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/0/1077518714.bmp');}"onmousewheel="returnimgzoom(this);">
我也遇到這個(gè)問題!我現(xiàn)在的電路在做傳導(dǎo)時(shí)500K左右超標(biāo).開關(guān)頻率100K
我也遇到這個(gè)問題!我現(xiàn)在的電路在做傳導(dǎo)時(shí)500K左右超標(biāo).開關(guān)頻率100K.共模電感加大點(diǎn)后超的更多了:(
我也遇到這個(gè)問題!我現(xiàn)在的電路在做傳導(dǎo)時(shí)500K左右超標(biāo).開關(guān)頻率100K.共模電感加大點(diǎn)后超的更多了:(
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@r00778
Vdsspike[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/0/1077518452.bmp');}"onmousewheel="returnimgzoom(this);">[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/0/1077518526.bmp');}"onmousewheel="returnimgzoom(this);">[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/0/1077518591.bmp');}"onmousewheel="returnimgzoom(this);">[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/0/1077518714.bmp');}"onmousewheel="returnimgzoom(this);">
There have some confuse
I thought your problem is conduction issue, right, so the band width should be 160K to 170K, not 160M to 170M, right? From your waveform, no problem for 160M to 170M radiation except the grounding problem. So for the conduction at 160K to 170K, modify frequency is a solution, but it is not a optimize solution, otherwise we can't run in higher frequency, ritht? So optimize common mode filter is a suitable solution, increase inductance or capacitance is the solution, but notice, do not increase the Y cap too high, it will impact the higher frequency band width and radiation, only increase inductance can solve it, you can use 10000u core, the inductance can over 20mH, I thought this should solve your problem, same as Huayong's solution. good luck to you.
I thought your problem is conduction issue, right, so the band width should be 160K to 170K, not 160M to 170M, right? From your waveform, no problem for 160M to 170M radiation except the grounding problem. So for the conduction at 160K to 170K, modify frequency is a solution, but it is not a optimize solution, otherwise we can't run in higher frequency, ritht? So optimize common mode filter is a suitable solution, increase inductance or capacitance is the solution, but notice, do not increase the Y cap too high, it will impact the higher frequency band width and radiation, only increase inductance can solve it, you can use 10000u core, the inductance can over 20mH, I thought this should solve your problem, same as Huayong's solution. good luck to you.
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