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高频变压器磁芯干扰的产生和解?/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><span style="font-family: 宋体; font-size: 10.5pt"> <strong><a href="http://www.chenfeipower.com/product/product-0001,0015.shtml">高频变压?/a></strong>的电磁兼容性是指既不产生对外界的电磁干?又能承受外界带来的电磁干扰。高频变压器的电磁干扰有可闻的音频噪声和不可闻的高频噪声之分。电磁干扰产生的原因之一就是磁芯的伸?一般磁芯伸缩大的软磁材?产生的电磁干扰大?/span></p>
<p><span style="font-family: 宋体; font-size: 10.5pt"> 例如,锰锌软磁铁氧?磁致伸缩系数λS?1×10?,是取向硅钢的7倍以?是高磁导坡莫合金和非晶合金的20倍以?是微晶纳米晶合金?0倍以上。因此锰锌软磁铁氧体磁芯产生的电磁干扰大。高频变压器产生电磁干扰的主要原因还有磁芯之间的吸力和绕组导线之间的斥力。这些力的变化频率与高频电源变压器的工作频率一致?/span></p>
<p><span style="font-family: 宋体; font-size: 10.5pt"> 因此,工作频率?00kHz左右的高频变压器,没有特殊原因是不会产?0kHz以下音频噪声的。既然提?0W以下单片开关电源的音频噪声频率,约为10kHz?0kHz,一定有其原因。由于没有画出噪声频谱图,具体原因说不清楚,但是由高频电源变压器本身产生的可能性不?没有必要采用玻璃珠胶合剂粘合磁芯。至于采用这种粘合工艺可将音频噪声降?dB,请给出实例与数据以及对噪声原因的详细说明,才会令人可信?/span></p>
<p><span style="font-family: 宋体; font-size: 10.5pt"> 屏蔽是防止电磁干?增加高频变压器电磁兼容性的好办法。但是为了阻止高频变压器的电磁干扰传?在设计磁芯结构和设计绕组结构也应当采取相应的措施,只靠加外屏蔽带并不一定是最佳方?因为它只能阻止辐射干?不能阻止传导干扰?br />
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