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高頻變壓器的漏感是什??</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>網責任編輯：<a >NSW</a></span><span>作者：<a >NSW</a></span><span>人氣??span
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<p> 處于理想中的<strong>高頻變壓??/strong>即完全耦合的變壓器的原邊繞組產生的磁通應全部穿過副邊繞組，沒有任何損失和泄漏。但是在實際的應用中,高頻變壓器不但沒有實現(xiàn)零損失和泄??而且原邊繞組產生的磁通也不可能全部穿過副邊繞組。非耦合部分磁通就在繞組或導體中有它自己的電感，存貯在這個“電感”中的能量不和主功率變壓器電路相耦合。這種電感我們稱之為“漏感”??/p>
<p> 理想的高頻變壓器對絕緣的要求和為了要得到很低的電磁干??EMI)而需要很緊的電磁耦合以減小漏感的要求，而這兩者之間是相互矛盾的。因為當高頻變壓器不通電(轉向脫離電源或開關處于關斷期??時，漏感存貯的能量要釋放出來形成明顯的噪音。在示波器上能看到此噪音的高頻尖峰脈沖波形。高頻尖峰脈沖波形的幅值Uspike和漏感Lleak與電流相對時間變化率的乘積成正比??/p>
<p> 當高頻變壓器的工作頻率升高時，電流相對時間的變化率也就增加。漏感的影響將更嚴重。漏感的影響和變換器的開關速度成正比。漏感產生過高的尖峰脈沖會損壞變換器中的功率器件并形成明顯的電磁干擾(EMI)。為了降低漏感產生的尖峰脈沖幅值Uspike，而在變換器電路中必須加入緩沖網絡。但緩沖網絡的加入，會增大變換器電路的損耗。使變換器電路隨工作頻率提高，損耗增加，效率降低??/p>
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