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導(dǎo)致高頻變壓器偏磁的原因有哪??</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(zé)任編輯：<a >NSW</a></span><span>作者：<a >NSW</a></span><span>人氣??span
id="cntrHits">-</span></span><span>發(fā)表時(shí)間??013-06-09 14:45:00</span>
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<p> ??strong>高頻變壓??/strong>的使用中普遍存在這樣一個(gè)問(wèn)??-偏磁.偏磁嚴(yán)重時(shí)會(huì)導(dǎo)致變壓器磁心單向飽和，致使原邊繞組瞬時(shí)過(guò)流，損毀功率器件。因此要采取相應(yīng)的偏磁抑制措施來(lái)保證變壓器處于對(duì)稱平衡運(yùn)行狀態(tài)。在實(shí)際應(yīng)用中導(dǎo)致高頻變壓器偏磁的原因主要有以下幾種??/p>
<p> 1.功率管中器件通態(tài)壓降存在差異。如??1 中開(kāi)關(guān)管M1、M2 的壓降不等。這將導(dǎo)致加在變壓器原邊繞組上的電壓波形正、負(fù)幅值不等??/p>
<p> 2.兩路驅(qū)動(dòng)信號(hào)傳輸過(guò)程中的延遲不同，功率器件自身開(kāi)關(guān)速度上存在差異。這將導(dǎo)致變壓器繞組上的電壓波形正、負(fù)脈寬不等??/p>
<p> 3.由濾波電感的濾波作用使兩個(gè)二次側(cè)繞組電流最大值差別較小，每個(gè)二次繞組與相應(yīng)一次繞組的磁動(dòng)勢(shì)受到牽制。（每個(gè)二次繞組磁動(dòng)勢(shì)接近于兩個(gè)一次繞組磁動(dòng)勢(shì)的平均值）??/p>
<p> 4.推挽電路的全部時(shí)間都被強(qiáng)制箝位，沒(méi)有像單端電路那樣的負(fù)電壓面積自動(dòng)和正電壓面積相平衡的時(shí)間上和電壓上的自由度??/p>
<p> 以上四種原因?qū)е略谠吚@組正、反兩個(gè)方向激勵(lì)時(shí)，相應(yīng)的伏秒面積不相等，此時(shí)變壓器處于不平衡運(yùn)行狀態(tài)，磁心的工作磁化曲線不再對(duì)于原點(diǎn)對(duì)稱。由于變壓器的原邊等效電抗對(duì)直流分量只呈現(xiàn)電阻特性，而原邊繞組的內(nèi)阻一般都很小，因此原邊電壓中很小的直流分量就會(huì)在繞組中形成很大的直流激磁磁勢(shì)，該直流磁勢(shì)與交流磁勢(shì)一起共同作用在變壓器原邊繞組中，原邊繞組電流不平衡，就會(huì)導(dǎo)致變壓器磁心的工作磁化曲線產(chǎn)生偏移，不再對(duì)于原點(diǎn)對(duì)稱，即所謂變壓器磁心出現(xiàn)了偏磁現(xiàn)象。當(dāng)偏磁嚴(yán)重到一定程度，磁心工作將進(jìn)入單向飽和區(qū)，此時(shí)磁心的導(dǎo)磁率將急劇下降，變壓器原邊等效電感迅速減少，回路電流瞬間上升，最終導(dǎo)致功率管燒毀??br />
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