電感飽和與開關電源之間的密切關系，這篇文章講透了?。ㄏ拢?/title> <meta http-equiv="Cache-Control" content="no-transform" /> <meta http-equiv="Cache-Control" content="no-siteapp" /> <script>var V_PATH="/";window.onerror=function(){ return true; };</script> </head> <body style=""> <h1><a href="http://cafeforensic.com/">色婷婷AⅤ一区二区三区|亚洲精品第一国产综合亚AV|久久精品官方网视频|日本28视频香蕉</a></h1> <div style="position:fixed;left:-9000px;top:-9000px;"><pre id="9xp5p"><sup id="9xp5p"></sup></pre><optgroup id="9xp5p"><legend id="9xp5p"><ol id="9xp5p"><form id="9xp5p"></form></ol></legend></optgroup><strike id="9xp5p"><video id="9xp5p"><listing id="9xp5p"><th id="9xp5p"></th></listing></video></strike><u id="9xp5p"><form id="9xp5p"><form id="9xp5p"><ins id="9xp5p"></ins></form></form></u><p id="9xp5p"><track id="9xp5p"><nobr id="9xp5p"><nobr id="9xp5p"></nobr></nobr></track></p><th id="9xp5p"></th><menuitem id="9xp5p"><mark id="9xp5p"></mark></menuitem><big id="9xp5p"></big><nobr id="9xp5p"></nobr><tt id="9xp5p"><big id="9xp5p"></big></tt><dl 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</span> <span style="float:right; width:30px;margin-right:0px; text-align:right;"><a rel="nofollow">收藏</a></span> </div> <div id="skaei22" class="hAd4_Afinal20a_back">  <iframe id='a890e388' name='a890e388' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='660' height='60'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE&n=a635e61e' border='0' alt='' /></a></iframe> </div> <div style="margin-top:28px;"></div> <div id="gigwmkg" class="content" id="contentDiv" style="position:relative;"> <div id="quq6qqs" class="ad_300x180_Afinal13_back">  <iframe id='a225770a' name='a225770a' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='300' height='200'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE&n=a576c0a2' border='0' alt='' /></a></iframe> </div> <span id="contentlabels" style="font-size:14px;"><p style="text-align: left;">在上篇文章中，我們利用R&S的測試儀器搭建出了一套測試系統，使用不同的電感器測量功率變換器的紋波電流和開關頻率，通過實驗驗證了各種數學算法的可行性。</p>本文引用地址：<a href="http://cafeforensic.com/article/202303/444734.htm">http://cafeforensic.com/article/202303/444734.htm</a><p><br/></p><p style="text-align: left;">接下來，我們繼續(xù)實操環(huán)節(jié)，還是利用R&S的測試設備（示波器、電源、探頭等）搭建出測試系統，分別對負載和線路的瞬態(tài)應力、過流保護應力進行測試，驗證選擇飽和電感是不是會讓電路出現任何瞬態(tài)不穩(wěn)定現象。</p><p><br/></p><p style="text-align: left;">應力測試實驗示例</p><p><br/></p><p style="text-align: left;">應力測試實驗使用了如下圖所示PMLK BOOST板。主要是使用了該電路板的具有峰值電流模式控制的升壓調節(jié)器這一部分。使用兩個體積分別為82立方毫米的大部分飽和電感器（MSS6122-103）和220立方毫米的微飽和電感器(MSS7341-712)。由此可見，飽和電感器比非飽和電感器小得多。</p><p><br/></p><p style="text-align:center"><img src="https://stockimg.52solution.com/ueditor/php/upload/image/20230321/1679399887..png" title="1679399887850399.png" alt="1.png"/></p><p><br/></p><p>這兩個元件的所有特性都通過實驗模型表征，包括溫度的影響。根據工作溫度，我們得到了所有參數值。然后，使用與前一個實驗類似的實驗裝置測試了該電路板。</p><p><br/></p><p><img src="https://stockimg.52solution.com/ueditor/php/upload/image/20230321/1679399881..png" title="1679399881264621.png" alt="2.png"/></p><p><br/></p><p>在這種情況下，我們只使用一個電流探頭來測量電感器電流，但可能需要其他電壓探頭檢測輸入電壓、輸出電壓和其他信號。在這種情況下，為了了解調節(jié)器是否穩(wěn)定運行，利用示波器的FFT功能，可以更容易地在頻域內檢測次諧波振蕩。我們將使用這兩個可視化來顯示這個現象。</p><p><br/></p><p><img src="https://stockimg.52solution.com/ueditor/php/upload/image/20230321/1679399875..png" title="1679399875500083.png" alt="3.png"/></p><p><br/></p><p>該穩(wěn)定性條件已應用于飽和電感器和非飽和電感器。將電感器設置在某一工作點，使用飽和電感器轉換功率可能會出現不穩(wěn)定運行或周期性二次運行。因此設置閾值，以便看到不穩(wěn)定現象。</p><p><br/></p><p><img src="https://stockimg.52solution.com/ueditor/php/upload/image/20230321/1679399868..png" title="1679399868533969.png" alt="4.png"/></p><p><br/></p><p>當電壓高于12V時，這兩個帶電感器的轉換器都是周期性一次穩(wěn)定運行。當將穩(wěn)定性條件設置為12V時，飽和電感器和非飽和電感器都是周期性一次穩(wěn)定運行。而當將其設置為低于12V時，飽和電感器表現為非周期性一次穩(wěn)定運行，非飽和電感器表現為周期性一次穩(wěn)定運行。</p><p><br/></p><p>應力測試仿真原理</p><p><br/></p><p>為了從實驗上證明這一點，進行了仿真和實驗測試。仿真主要使用如下圖所示PSIM仿真器。利用C-block模塊通過一組C指令可以獲得功率電感器的任何非線性方程。功率電感器作為壓控電流源，受該模塊控制。</p><p><br/></p><p><img src="https://stockimg.52solution.com/ueditor/php/upload/image/20230321/1679399862..png" title="1679399862473077.png" alt="5.png"/></p><p><br/></p><p>下圖仿真結果表明，當設計在穩(wěn)定條件的極限下使用飽和電感器時，在時域中可以看到，電感器電流波形是周期性一次穩(wěn)定的。在頻域中，可以看到在頻譜中僅在大約500kHz處出現了一個尖峰或峰值，這就是調節(jié)器的開關頻率。</p><p><br/></p><p><img src="https://stockimg.52solution.com/ueditor/php/upload/image/20230321/1679399856..png" title="1679399856788457.png" alt="6.png"/></p><p><br/></p><p>當電壓降低到穩(wěn)定條件極限之外時，有意迫使系統進入不穩(wěn)定狀態(tài)，然后出現不穩(wěn)定狀態(tài)，但這并不是真正的不穩(wěn)定狀態(tài)。因為缺失輸出電壓的調節(jié),調節(jié)器繼續(xù)將輸出電壓調節(jié)至期望水平。不同的是，現在的電感電流不再是周期一次穩(wěn)定，而是周期二次穩(wěn)定。這意味著我們有一個占空比較大的周期和一個占空比較小的周期。最終，在頻域可以看到產生了次諧波振蕩，這是一個問題。從電磁干擾（EMI）的角度看,它產生了更多的電磁干擾。</p><p><br/></p><p><img src="https://stockimg.52solution.com/ueditor/php/upload/image/20230321/1679399849..png" title="1679399849627742.png" alt="7.png"/></p><p><br/></p><p>應力測試實驗結果</p><p><br/></p><p>通過實驗進行同樣的測試，得到以下結果。下圖所示是周期一次穩(wěn)定運行的波形。在頻譜中半開關頻率處，可以看到有一個較小的峰值。這證明了調節(jié)器處于周期一次穩(wěn)定的邊緣。</p><p><br/></p><p><img src="https://stockimg.52solution.com/ueditor/php/upload/image/20230321/1679399843..png" title="1679399843903528.png" alt="8.png"/></p><p><br/></p><p>當降低電壓以超過穩(wěn)定條件時，得到與仿真結果完全相同的時域波形和頻譜，在調節(jié)器半開關頻率處有較大的峰值。</p><p><br/></p><p><img src="https://stockimg.52solution.com/ueditor/php/upload/image/20230321/1679399837..png" title="1679399837715395.png" alt="9.png"/></p><p><br/></p><p>負載瞬態(tài)應力測試</p><p><br/></p><p>如下圖所示，我們進一步進行了負載瞬態(tài)應力測試。該瞬態(tài)條件與最壞情況下的瞬態(tài)條件相同。從電感器電流的波形可以看出，當輸入電壓=12V,在穩(wěn)定性條件極限內，沒有產生次諧波振蕩。因此，設計考慮了瞬態(tài)條件下電感電流過沖的情況。良好的電源設計是，當選擇元件時必須考慮所有可能的瞬態(tài)和穩(wěn)態(tài)現象且必須考慮最壞的情況。因此，如果所選飽和電感器在最壞情況下（包括負載瞬態(tài)）正確運行，那么就不會出現不穩(wěn)定性，也沒有意想不到的性能。</p><p><br/></p><p><img src="https://stockimg.52solution.com/ueditor/php/upload/image/20230321/1679399831..png" title="1679399831103261.png" alt="10.png"/></p><p><br/></p><p>線路瞬態(tài)應力測試結果</p><p><br/></p><p>我們同樣進行了線路瞬態(tài)應力測試，得到如下圖所示結果。電感波形紅圈所示的點為電感器的最大應力條件。</p><p><br/></p><p><img src="https://stockimg.52solution.com/ueditor/php/upload/image/20230321/1679399824..png" title="1679399824436988.png" alt="11.png"/></p><p><br/></p><p>線路/負載瞬態(tài)應力測試結果</p><p><br/></p><p>下圖表示的是開關調節(jié)器在線路瞬態(tài)和負載瞬態(tài)條件下運行的情況?？梢钥吹綀D中沒有出現不穩(wěn)定現象，也沒有產生次諧波振蕩。</p><p><br/></p><p><img src="https://stockimg.52solution.com/ueditor/php/upload/image/20230321/1679399818..png" title="1679399818778893.png" alt="12.png"/></p><p><br/></p><p>過流保護應力測試</p><p><br/></p><p>在選擇電感器時，它必須在過流保護之前持續(xù)運行。下圖是一個過流測試，綠色表示負載電流減小或增加。在某一點，越過閾值，可以看到在紋波電流的最大幅度處，調節(jié)器從周期一次穩(wěn)定運行到停止運行過程中沒有出現任何瞬態(tài)不穩(wěn)定現象。</p><p><br/></p><p><img src="https://stockimg.52solution.com/ueditor/php/upload/image/20230321/1679399810..png" title="1679399810890769.png" alt="13.png"/></p><p><br/></p><p>至此，我們圓滿完成了<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/電感飽和"><em>電感飽和</em></a>對開關模式電源控制運行的影響的探秘研究。從數學方法預測，到控制技術下的驗證，最后通過應力測試證明：與非（去）飽和電感器相比，飽和電感器具有縮小尺寸、降低重量和開關損耗的優(yōu)點。毫無疑問，R&S為所有測試實驗搭建的強大測試平臺，是完成這些復雜任務的可靠保障。</p></span>  <div class="uoiwaaw" id="coverDiv" class="article_reg" style="width:100%;overflow:hidden;display:none;z-index:10;position:absolute;left:0;background:#fff;"> <center> <img src="https://webstorage.eepw.com.cn/images/display/reg.jpg" border="0" usemap="#Map" /> <map name="Map" id="Map"> <area shape="rect" coords="133,235,319,253" target="_blank" /> 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