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說說高頻變壓器與開關(guān)電源之間的聯(lián)系</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(shí)間??015-06-19 10:33:00</span>
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<p><span style="font-size: 14px"> 高頻變壓器是開關(guān)電源中進(jìn)行能量?jī)?chǔ)存與傳輸?shù)闹匾考?，單片開關(guān)電源中高頻變壓器性能的優(yōu)劣，不僅對(duì)電源效率有較大的影響，而且直接關(guān)系到電源的其它技術(shù)指標(biāo)和電磁兼容??EMC)。將高頻傳輸線繞在具有高導(dǎo)磁??u)低損耗的鐵氧體磁環(huán)上就變成傳輸絕變壓器，其電路從表面上看似乎與普通變壓器沒有多大差別，但實(shí)際上它們傳遞能量的方式是不相同的??/span></p>
<p> </p>
<p><span style="font-size: 14px"> 為此，一個(gè)高效率<strong><a href="http://www.linhang.com.cn/product/">高頻變壓??/a></strong>應(yīng)具備直流損耗和交流損耗低、漏感小、繞組本身的分布電容及各繞組之間的耦合電容要小等條件??/span></p>
<p> </p>
<p><span style="font-size: 14px"> 所謂的高頻開關(guān)，一般都是指高頻開關(guān)電源。其基本控制原理為：開關(guān)以一定的時(shí)間間隔重復(fù)地接通和斷開：在開關(guān)接通時(shí)，輸入電源通過開關(guān)和濾波電路提供給負(fù)載，在整個(gè)開關(guān)接通期間，電源向負(fù)載提供能??當(dāng)開關(guān)斷開時(shí)，輸入電源便中斷了能量的提供。因此，輸入電源向負(fù)載提供能量是斷續(xù)的，為使負(fù)載能得到連續(xù)的能量提供，開關(guān)穩(wěn)壓電源必須要有一套儲(chǔ)能裝置，在開關(guān)接通時(shí)將一部份能量?jī)?chǔ)存起來，在開關(guān)斷開時(shí)，向負(fù)載釋放??/span></p>
<p> </p>
<p><span style="font-size: 14px"> 改變開關(guān)接通時(shí)間和工作周期的比例，電壓的平均值也隨之改變，因此，隨著負(fù)載及輸入電源電壓的變化自動(dòng)調(diào)整便能使輸出電壓維持不變。改變接通時(shí)間和工作周期比例亦即改變脈沖的占空比，這種方法稱??ldquo;時(shí)間比率控制”(Time Ratio Control,縮寫為TRC)。所謂直流斷路器，即是在直流配電系統(tǒng)中提供直流回路通斷的開關(guān)，以對(duì)過載、短路等過電流故障提供可靠保護(hù)??/span></p>
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