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开关电源变压器和变压器有什么区?什么是高频和低频？</h3>
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<span>文章出处?a href=""><a href="http://cfdz.nsw888.com">深圳市晨飞电子有限公?/a></a></span><span>网责任编辑：<a href="http://cfdz.nsw888.com">NSW</a></span><span>作者：<a href="http://cfdz.nsw888.com">NSW</a></span><span>人气?span
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<p>变压器只能用在交流电路中，在初级输入交流电，而次输出也是交流电，只要改变初次级匝数比，就能改变输出电压，所以是在交流电路中改变电压的常用方法。但是它不能用在直流电路中?/p>
<p> <strong><a href="http://www.chenfeipower.com/">开关电源变压器</a></strong>是输入直流电，经过一?ldquo;自动开?rdquo;的控制，将直流电变成断断续续的状态，再经过变压器改变电压，再经整流电路变成直流电。所以它是用来改变直流电压的。由于它在中间过程中要将直流电变成断断续续的的状态，这种断断续续就相当于产生了一个高频交流电，而高频交流电使用的变压器体积较小，所以开关电源的体积一般很小巧，而且效率也比较高。由于有这一优点，所以有些交流电要改变电压也采取先变直流，再用开关电源的方案，这样体积小巧，但是技术含量较高?/p>
<p> 高频与低频是指交流电在每秒钟里变化的次数，单位是赫兹(Hz)。一般当频率在几百Hz以下称为低频?/p>
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