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需要知道的高頻變壓器的設(shè)計基礎(chǔ)知識</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
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<p> <span style="font-size: 14px">高頻鏈逆變技術(shù)用高頻變壓器代替保守逆變器中笨重的工頻變壓器，大大減小了逆變器的體積和重量。高頻鏈的硬件電路設(shè)計中，高頻變壓器是重要的一環(huán)??/span></p>
<p> </p>
<p><span style="font-size: 14px"> 設(shè)計</span><strong><a href="http://cmqp.com.cn/Products/products-12081703391.html"><span style="font-size: 14px">高頻變壓??/span></a></strong><span style="font-size: 14px">首先應(yīng)該從磁芯開始，開關(guān)電源變壓器磁芯多是低磁場下使用的軟磁材料，有較高磁導(dǎo)率，低的矯頑力，高的電阻率。磁導(dǎo)率高，一定線圈匝數(shù)時，通過不大的激磁電流就能承受較高的外加電壓，因此，輸出一定功率要求下，可減輕磁芯體積。磁芯矯頑力低，磁滯面積小，則鐵耗也少。高的電阻率，則渦流小，鐵耗小。鐵氧體材料是復(fù)合氧化物燒結(jié)體，電阻率很高，適合高頻下使用，但Bs值比較小，常使用在開關(guān)電源中??/span></p>
<p> </p>
<p><span style="font-size: 14px"> 高頻變壓器的設(shè)計通常采用兩種方法：第一種是先求出磁芯窗口面積AW與磁芯有效截面積Ae乘積APAP=A WAe稱磁芯面積乘??，根據(jù)AP值，查表找出所需磁性資料之編號;第二種是先求出幾何參數(shù)，查表找出磁芯編號，再進行設(shè)計??/span></p>
<p> </p>
<p><span style="font-size: 14px"> 注意??/span></p>
<p> </p>
<p><span style="font-size: 14px"> 1、設(shè)計中，最大輸出功率時，磁芯中的磁感應(yīng)強度不應(yīng)達到飽和，以免在大信號時產(chǎn)生失真??/span></p>
<p> </p>
<p><span style="font-size: 14px"> 2、瞬變過程中，高頻鏈漏感和分布電容會引起浪涌電流和尖峰電壓及脈沖頂部振蕩，使損耗增加，嚴重時會造成開關(guān)管損壞。同時，輸出繞組匝數(shù)多，層數(shù)多時，應(yīng)考慮分布電容的影響，降低分布電容有利于抑制高頻信號對負載的干擾。對同一變壓器同時減少分布電容和漏感是困難的應(yīng)根據(jù)不同的工作要求，保證合適的電容和電感??/span></p>
<p> </p>
<p><span style="font-size: 14px"> 單片開關(guān)電源高頻變壓器的設(shè)計要??/span></p>
<p> </p>
<p><span style="font-size: 14px"> 高頻變壓器是單片開關(guān)電源的核心部件，鑒于這種高頻變壓器在設(shè)計上有其特殊性，為此專門論述降低其損耗及抑制音頻噪聲的方法，可供高頻變壓器設(shè)計人員參考??/span></p>
<p> </p>
<p><span style="font-size: 14px"> 單片開關(guān)電源集成電路具有高集成度、高性價比、最簡外圍電路、最佳性能指標(biāo)等優(yōu)點，能構(gòu)成高效率無工頻變壓器的隔離式開關(guān)電源??/span></p>
<p> </p>
<p><span style="font-size: 14px"> 高頻變壓器是開關(guān)電源中進行能量貯存與傳輸?shù)闹匾考?，單片開關(guān)電源中高頻變壓器性能的優(yōu)劣，不只對電源效率有較大的影響，而且直接關(guān)系到電源的其它技術(shù)指標(biāo)和電磁兼容??EMC為此，一個高效率高頻變壓器應(yīng)具備直流損耗和交流損耗低、漏感小、繞組自身的分布電容及各繞組之間的耦合電容要小等條件??/span></p>
<p> </p>
<p><span style="font-size: 14px"> 高頻變壓器的直流損耗是由線圈的銅損耗造成的，為提高效率，應(yīng)盡量選擇較粗的導(dǎo)線，并取電流密度J=410A /mm2</span></p>
<p> </p>
<p><span style="font-size: 14px"> 高頻變壓器的交流損耗是由高頻電流的趨膚效應(yīng)以及磁芯的損耗引起的，高頻電流通過導(dǎo)線時總是趨向于從表面流過，這會使導(dǎo)線的有效流通面積減小，并使導(dǎo)線的交流等效阻抗遠高于銅電阻。高頻電流對導(dǎo)體的穿透能力與開關(guān)頻率的平方根成反比，為減小交流銅阻抗，導(dǎo)線半徑不得超越高頻電流可達深度??倍?？晒┻x用的導(dǎo)線線徑與開關(guān)頻率的關(guān)系曲線如圖1所示。舉例說明，當(dāng)f=100kHz時，導(dǎo)線直徑理論上可??phi;0.4mm但為了減小趨膚效應(yīng)，實際可用更細的導(dǎo)線多股并繞，而不必一根粗導(dǎo)線繞制??/span></p>
<p> </p>
<p><span style="font-size: 14px"> 設(shè)計高頻變壓器時必需把漏感減至最小，因為漏感愈大，發(fā)生的尖峰電壓幅度愈高，漏極鉗位電路的損耗就愈大，這必定導(dǎo)致電源效率降低。對于一個符合絕緣及平安性標(biāo)準(zhǔn)的高頻變壓器，其漏感量應(yīng)為次級開路時初級電感量的1%3%要想達到1%以下的指標(biāo)，制造工藝上將難于實現(xiàn)。減小漏感時可采取以下措施：</span></p>
<p> </p>
<p><span style="font-size: 14px"> 減小初級繞組的匝數(shù)NP??/span></p>
<p> </p>
<p><span style="font-size: 14px"> 增大繞組的寬??例如選EE型磁芯，以增加骨架寬度b)</span></p>
<p> </p>
<p><span style="font-size: 14px"> 增加繞組的高、寬比??/span></p>
<p> </p>
<p><span style="font-size: 14px"> 減小各繞組之間的絕緣層??/span></p>
<p> </p>
<p><span style="font-size: 14px"> 增加繞組之間的耦合程度??/span></p>
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