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開關(guān)電源紋波產(chǎn)生的原因分析</h3>
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<span>文章出處??a href=""><a >深圳市晨飛電子有限公??/a></a></span><span>網(wǎng)責(zé)任編輯：<a >NSW</a></span><span>作者：<a >NSW</a></span><span>人氣??span
id="cntrHits">-</span></span><span>發(fā)表時間??016-05-17 16:03:00</span>
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<p><a href="http://linhang.com.cn"><strong>開關(guān)電??/strong></a>設(shè)計時經(jīng)常會出現(xiàn)噪聲，也就是輸出波紋，那么開關(guān)電源產(chǎn)生波紋的原因是什么呢？由于波紋的存在會對開關(guān)電源的正常工作產(chǎn)生影響，因此我們必須抑制波紋的產(chǎn)生，但是我們只有對產(chǎn)生波紋的原因進行了解分析了，我們才可能找到解決的辦法，本文就是為大家先介紹開關(guān)電源波紋產(chǎn)生的原因進行了分析。具體的情況請看下面具體的分析??/p>
<p> </p>
<p style="text-align: center;"><img src="http://linhang.com.cn/UploadFiles/Product/20120703160354_67923.jpg" alt="開關(guān)電源變壓器" title="ER40高頻變壓器立?? /></p>
<p style="text-align: center;"> </p>
<p>隨著SWITCH的開關(guān)，電感L中的電流也是在輸出電流的有效值上下波動的。所以在輸出端也會出現(xiàn)一個與SWITCH同頻率的紋波，一般所說的紋波就是指這個。它與輸出電容的容量和ESR有關(guān)系。這個紋波的頻率與開關(guān)電源相同，為幾十到幾百KHz??/p>
<p> </p>
<p>另外，SWITCH雙極晶體管或MOSFET的一般選擇，不管是哪一種，在其帶領(lǐng)的截止時間，會有一個上升時間和下降時間。此時在電路中會出現(xiàn)與開關(guān)上升時間相同或頻率為奇 數(shù)的頻率的噪音，通常為幾十兆赫。在反向恢復(fù)的瞬間，等效電路的電阻電容和電感串聯(lián)，將導(dǎo)致共振，噪聲頻率也為幾十兆赫。這2種噪聲通常被稱為高頻噪聲， 而振幅通常遠大于紋波??/p>
<p> </p>
<p>如果是AC／DC變換器，除了上述兩種紋波(噪聲)以外，還有AC噪聲，頻率是輸入AC電源的頻率，??0??0Hz左右。還有一種共模噪聲，是由于很多開關(guān)電源的功率器件使用外殼作為散熱器，產(chǎn)生的等效電容導(dǎo)致的??/p>
<p> </p>
<p>開關(guān)電源的波紋有什么要求呢？主要是看產(chǎn)品的設(shè)計以及對負(fù)載的需?? 現(xiàn)在做一個好點的電源，輸出紋波電壓控制在以下200mV，小??0mV 如果一個小信號模擬和數(shù)字控制電路，特別是模擬電路，電源紋波要求非常干凈，對其他應(yīng)用程序，如發(fā)光二極管驅(qū)動電源，紋波是一點點也沒有太大的影響</p>
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mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA">以上就是小編為大家總結(jié)的關(guān)于開關(guān)電源波紋產(chǎn)生的原因的分析，以供大家參考??span style="color:gray">如果還有什么問題或者了解更多關(guān)于高頻變壓器的知識，需要學(xué)習(xí)資料的朋友，本網(wǎng)站每周會更新一，兩篇相關(guān)的文章在這個專題，為了方便大家查看，可</span></span>收藏本網(wǎng)站。如果你還想了解本站更多的相關(guān)文章，可以點擊<a href="http://linhang.com.cn/news/"><strong>高頻變壓器知??/strong></a>解答??/p>
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