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設(shè)計高頻變壓器時我們應(yīng)該注意一些什么？</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;"><a href="http://m.cmqp.com.cn">高頻變壓??/a>是相對于音頻和工頻變壓器而言的。我們將工作頻率在音頻以上的變壓器統(tǒng)稱為高頻變壓器。一般，我們將高頻變壓器分為兩種類型，一種稱作為單頻或窄頻級的高頻變壓器，其工作頻率為單一頻率或是一個較窄的頻段，如變換器變壓器、振蕩器變壓器等；另一種稱作為寬帶變壓器，它是指工作在一個比較寬或很寬的頻率范圍內(nèi)的變壓器，如阻抗變換器變壓器、通訊變壓器等。高頻變壓器的主要用途是用于兩個放大器之間、負載與饋線或饋線與負載間的阻抗匹配；與電源變壓器相比，高頻變壓器設(shè)計要復(fù)雜一些；所用的材料和磁芯品種也比電源變壓器來得多。在設(shè)計高頻變壓器時，以下問題必須加以注意??/span></p>
<p> </p>
<p style="text-align: center;"><span style="font-size: 14px;"> </span><img width="247" height="247" title="EE10高頻變壓器立?? alt="EE10高頻變壓器立?? src="http://m.cmqp.com.cn/UploadFiles/Product/20120630161318_19225.jpg" /></p>
<p> </p>
<p><span style="font-size: 14px;">當(dāng)起繞開始和結(jié)束出入線在BOBBIN同一側(cè)時。原則上以一線一凹槽方式出線。出入線於使用BOBBIN之凹槽出線時。若同一PIN有多組可使用同一凹槽或相鄰的凹槽出線，唯在焊錫及裝套管時要注意防止短路。除工程圖面上有特別規(guī)定繞法時。繞線時需均勻整齊繞滿BOBBIN繞線區(qū)為原則。則以圖面為準。其出入線所加之鐵氟龍?zhí)坠茼毰cBOBBIN凹槽口齊??或至少達2/3??并自BOBBIN凹槽出線以防止因套管過長造成拉力將線扯斷。但若為LPIN水平方向纏線??/span></p>
<p><span style="font-size: 14px;"> </span></p>
<p><span style="font-size: 14px;">高頻變壓器中須加醋酸布作為檔墻膠帶時。故要求2TS以上之醋酸布重疊不可超越5mm包一圈之醋酸布只須包0.9T留缺口以利於凡立水良好的滲入底層.醋酸布寬度擇用與高頻變壓器安規(guī)要求有關(guān)，VED繞法ACT寬度3.2mm包兩邊且須加TUBE.繞法：PIN??mm/4.8mm/4.4mm/4mm;TOP??mm/2.4mm/2.2mm/2mm時不須TUBE.繞線時銅線不可上檔墻，若有套管，套管必需伸入檔墻3mm以上??/span></p>
<p><span style="font-size: 14px;"> </span></p>
<p><span style="font-size: 14px;">設(shè)計高頻變壓器必須了解該變壓器的所在的工作電路，高頻變壓器工作在放大電路中，是放大器的組成部分。在分析與設(shè)計高頻變壓器時，必須與放大電路相結(jié)合，確定有關(guān)參數(shù)。例如，變壓器的次級參數(shù)（電壓、電流），在電源變壓器中，是直接規(guī)定次級電壓和電流的。而在高頻變壓器中，則是按阻抗匹配原理，并根據(jù)負載阻抗先確定匝數(shù)比，再計算電壓和電流：或根據(jù)輸出功率和負載阻抗來計算次級電壓和電流??規(guī)劃變壓器時，應(yīng)當(dāng)預(yù)先曉得電路拓撲、作業(yè)頻率、輸入和輸出電壓、輸出功率或輸出電流以及環(huán)境條件。一起還應(yīng)當(dāng)曉得所規(guī)劃的變壓器答應(yīng)多大損耗?？偸且詽M意最壞狀況規(guī)劃變壓器，確保規(guī)劃的變壓器在規(guī)則的任何狀況下都能滿意作業(yè)??開關(guān)電源中功率變壓器的首要意圖是傳輸功率。將一個電源的能量瞬時地傳輸?shù)截撦d??/span></p>
<p><span style="font-size: 14px;"> </span></p>
<p><span style="font-size: 14px;">在規(guī)劃開關(guān)電源開始時，依據(jù)輸出功率，輸出電壓和輸 出電壓調(diào)理規(guī)模、輸入電壓、環(huán)境條件等要素，規(guī)劃者憑經(jīng)歷或參照同類樣機，給出一個能夠到達的功率，由此得到總損耗值。再將總損耗分配到各損耗部件，得到 變壓器的答應(yīng)損耗??變壓器損耗使得線圈和磁芯溫度進步，線圈中間接近磁芯表面溫度最高，此最??ldquo;熱門” 約束了變壓器的溫升。依據(jù)式??-15），????Delta;T（℃）等于變壓器熱阻Rth（℃/ W）乘以功率損耗P（W）：</span></p>
<p><span style="font-size: 14px;"> </span></p>
<p><span style="font-size: 14px;">在通常工業(yè)產(chǎn)品中，民用環(huán)境溫度最高為40℃。高頻變壓器內(nèi)部最高溫度受磁芯和絕緣材料約束，假如選用鐵氧體與A或E級絕緣，變壓器溫升通常定為40??0℃溫升。其內(nèi)部熱門溫度??00℃。假如溫升過高，應(yīng)當(dāng)??用較大尺度的磁芯。假如需求較小的體積，應(yīng)當(dāng)選用合金磁芯和高絕緣等級的絕緣材料，較高溫升，但使功率下降。變壓器損耗分為磁芯損耗和線圈損耗，很難 準確估計。磁芯損耗包含磁滯損耗和渦流損耗。線圈損耗包含直流損耗和高頻損耗。導(dǎo)致變壓器溫升首要是穩(wěn)態(tài)損耗，而不是瞬態(tài)損耗??/span></p>
<p><span style="font-size: 14px;">以上就是小編為大家總結(jié)的設(shè)計高頻變壓器時要注意什么事項的分析，以供大家參??如果還想了解開高頻變壓器的價格，工藝等其他問題，那就點??a href="http://m.cmqp.com.cn/news/"><span style="color: red;">高頻變壓器資??/span></a>吧！</span></p>
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