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晨飛資訊</a> » <a href="/Article/kaiguandianyuanbiany_1.html">開關電源變壓器和變壓器有什么區(qū)??什么是高頻和低頻？</a></div>
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開關電源變壓器和變壓器有什么區(qū)??什么是高頻和低頻？</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)責任編輯：<a >NSW</a></span><span>作者：<a >NSW</a></span><span>人氣??span
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<p>變壓器只能用在交流電路中，在初級輸入交流電，而次輸出也是交流電，只要改變初次級匝數(shù)比，就能改變輸出電壓，所以是在交流電路中改變電壓的常用方法。但是它不能用在直流電路中??/p>
<p> <strong><a href="http://linhang.com.cn/">開關電源變壓器</a></strong>是輸入直流電，經(jīng)過一??ldquo;自動開??rdquo;的控制，將直流電變成斷斷續(xù)續(xù)的狀態(tài)，再經(jīng)過變壓器改變電壓，再經(jīng)整流電路變成直流電。所以它是用來改變直流電壓的。由于它在中間過程中要將直流電變成斷斷續(xù)續(xù)的的狀態(tài)，這種斷斷續(xù)續(xù)就相當于產(chǎn)生了一個高頻交流電，而高頻交流電使用的變壓器體積較小，所以開關電源的體積一般很小巧，而且效率也比較高。由于有這一優(yōu)點，所以有些交流電要改變電壓也采取先變直流，再用開關電源的方案，這樣體積小巧，但是技術含量較高??/p>
<p> 高頻與低頻是指交流電在每秒鐘里變化的次數(shù)，單位是赫茲(Hz)。一般當頻率在幾百Hz以下稱為低頻??/p>
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