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高頻變壓器電磁屏蔽的設計</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> <strong>高頻變壓??/strong>的電磁屏蔽設計多數(shù)將變壓器整體地封有時把驅動電路的部件也包括在內。這種屏蔽結構時，為防止在高壓繞組和金屬盒內之間可能產(chǎn)生的飛弧，兩者中間要留有足夠大的空隙。所以，這種屏蔽結構對電磁場的屏蔽效果是不理想的，同時還顯示器中占據(jù)相當大的空間??/p>
<p> 另一種屏蔽結構是將變壓器整體地灌封在具有高介電常數(shù)的絕緣材料中，形成一體化無間隙結構。這種灌注成整體結構的問題是：要使灌封達到無間隙，工藝操作上有相當難度；由于以環(huán)氧樹脂為代表的灌封材料的位移電荷在封裝材料表面形成高電位，將通過較低介電常數(shù)的空氣向有足夠電位差的表面形成飛弧??br />
<br />
高頻變壓器的屏蔽結構由三部分組成：磁路、安裝在磁路上的繞組、外表面層的等場強結構的屏蔽罩，其包括大部分在電氣特性上與磁路完全一致的連續(xù)磁環(huán)路及部分繞組組件。同時，為了防止飛弧，還要在繞組部件有較高電場強度表面一定的距離上，用空氣隙和環(huán)氧樹脂來增加強電場區(qū)域的屏蔽層厚度??br />
<br />
這里介紹這種屏蔽的一個典型設計實例：較低電場區(qū)域設臵一個電氣特性上連續(xù)的屏蔽環(huán)路；在較高電場區(qū)域它應與繞組保持足夠的空間距離，以防止屏蔽環(huán)內部電介質（這里指空氣與環(huán)氧樹脂）電擊穿。這樣，便可從選定等場強的外形并結合適當選擇電氣特性上連續(xù)的環(huán)路數(shù)、以使高頻變壓器得到比較完善的屏蔽效果。在此結構形式的基礎上，我們可以從適當變化屏蔽環(huán)的尺寸和布局，為變壓器提供一個分布式散熱器，增強變壓器的冷卻效果??/p>
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