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高頻變壓器分布參數(shù)的影響有哪??</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>為滿足小型化和高頻化的需??高頻變壓器的設計在不斷地朝著這個方向發(fā)展,但是變壓器分布參數(shù)的影響卻越來越明顯??在一般的理論分析中，為了簡化分析過程，通常忽略功率變壓器的勵磁電感和漏感，以便獲得電路工作的基本原理和基本特征。實際上，寄生參量是客觀存在的，而且隨著開關(guān)頻率的提高，分布參數(shù)的影響越嚴重??/p>
<p> 1.勵磁電感</p>
<p> 由于磁導率是有限的，則在原邊繞組中就有勵磁電流存在。這一增加的電流可以在等效電路中增加一個和原邊線圈并聯(lián)的勵磁電感Lm來表示。勵磁電感能量表示有限磁導率的磁芯中和兩半磁芯結(jié)合處氣隙存儲的能量。存儲的能量與加到線圈上每匝伏特有關(guān)，與負載電流無關(guān)??/p>
<p> 2.漏感</p>
<p> 在實際變壓器中，如果初級與次級之間、匝與匝之間、層與層之間磁通沒有完全耦合，就會產(chǎn)生漏感。漏感能量表示線圈間不耦合磁通經(jīng)過的空間存儲的能量。在等效電路中，漏感與理想變壓器激勵線圈串聯(lián)，其存儲的能量與激勵線圈電流的平方成正比??/p>
<p> 3.分布電容</p>
<p> 在實際高頻變壓器的繞組中存在著分布電容，尤其存在于線圈導線和變壓器磁心之間以及各繞組之間。電容量的大小取決于繞組的幾何形狀、磁心材料的介電常數(shù)和它的封裝材料等。在等效電路中，在每一理想線圈兩端并聯(lián)一個集中的電容??br />
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