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<i>></i> <span>技術(shù)文章</span> </div> </div> <div id="yaqj8xyjh" class="page-right-content art"> <h1 class="h1-title">串聯(lián)諧振變換器的滑?？刂?/h1> <p style="line-height: 32px;text-indent: 0;margin: 0;padding: 0;text-align: center"> <span style="color: #888">發(fā)布時(shí)間：2020-07-02 14:03:00</span> <span style="margin-left: 30px;color: #888">瀏覽次數：2723</span> </p> <div style="padding: 20px 0 50px 0"> <p style="line-height: 2em;"><span style="font-size: 16px; font-family: 微軟雅黑, "Microsoft YaHei";"> 華意電力是一家專(zhuān)業(yè)研發(fā)生產(chǎn)</span><a href="http://m.shlinjisuoju.com/100" target="_blank" style="text-decoration: none; font-size: 16px; font-family: 微軟雅黑, "Microsoft YaHei";"><span style="font-size: 16px; font-family: 微軟雅黑, "Microsoft YaHei";">串聯(lián)諧振</span></a><span style="font-size: 16px; font-family: 微軟雅黑, "Microsoft YaHei";">的廠(chǎng)家，本公司生產(chǎn)的</span><a href="http://m.shlinjisuoju.com/100" target="_blank" style="text-decoration: none; font-size: 16px; font-family: 微軟雅黑, "Microsoft YaHei";"><span style="font-size: 16px; font-family: 微軟雅黑, "Microsoft YaHei";">串聯(lián)諧振</span></a><span style="font-size: 16px; font-family: 微軟雅黑, "Microsoft YaHei";">設備在行業(yè)內都廣受好評，以打造最具權威的“</span><a href="http://m.shlinjisuoju.com/100" target="_blank" style="text-decoration: none; font-size: 16px; font-family: 微軟雅黑, "Microsoft YaHei";"><span style="font-size: 16px; font-family: 微軟雅黑, "Microsoft YaHei";">串聯(lián)諧振</span></a><span style="font-size: 16px; font-family: 微軟雅黑, "Microsoft YaHei";">“高壓設備供應商而努力。</span></p><p style="line-height: 2em;"><span style="font-size: 16px; font-family: 微軟雅黑, "Microsoft YaHei";"> 諧振式變換器是采用適當的電路結構與開(kāi)關(guān)控制策略相結合的產(chǎn)物，可同時(shí)解決開(kāi)關(guān)強度、開(kāi)關(guān)損耗以及電磁干擾等問(wèn)題．因此，它以更顯著(zhù)的優(yōu)點(diǎn)被廣泛應用于工業(yè)、航天等各領(lǐng)域．然而，由于諧振環(huán)節的存在，電路模型的復雜性及高階狀態(tài)方程使得其控制變的更加困難，且在控制過(guò)程中每個(gè)諧振周期內，輸出電壓都會(huì )存在大量的紋波．為了調整輸出電壓及解決紋波問(wèn)題，一般采用兩種閉環(huán)控制方案：一種基于輸出電壓誤差估計的預測控制方法：另一種是滑?？刂撇呗裕陬A測方法中，需要建立能精確描述諧振變換器動(dòng)態(tài)過(guò)程的離散化模型，并設計預測估計控制環(huán)節．然而，由于需要大量控制算法的實(shí)時(shí)計算造成了控制器實(shí)現的困難．</span></p><p style="line-height: 2em;"><span style="font-size: 16px; font-family: 微軟雅黑, "Microsoft YaHei";"> 滑?？刂婆c常規控制的根本區別在于控制的不連續性，即一種使系統“結構”隨時(shí)間變化的開(kāi)關(guān)特性．由于功率變換器中開(kāi)關(guān)元件的存在．恰好歸人這一類(lèi)變結構系統。而滑?？刂评碚撘苍贒C．DC變換器中得到廣泛的應用。本文詳細介紹了DC．DC 變換器的滑模變結構控制，論述了如何以等效控制為分析手段來(lái)分析Buck、Boost和Buck．Boost變換器．論述了串聯(lián)偕振變換器的滑模變結構控制，文中選擇串聯(lián)環(huán)節的峰值電流、輸出電壓及其積分作為狀態(tài)變量設計切換面踴數，使得系統對輸入電壓的變化具有很好的魯棒性．本文以全橋式串聯(lián)諧振變換器(Series Resonant Converter，SRC)為研究對象，利用兩種方法設計滑?？刂破?，并對其進(jìn)行分析比較．文中首先給出SRC精確的動(dòng)態(tài)電路模型，再通過(guò)某些假設條件將其簡(jiǎn)化為適合變結構控制的電路模型.</span></p><p style="line-height: 2em;"><span style="font-size: 16px; font-family: 微軟雅黑, "Microsoft YaHei";"> 串聯(lián)諧振變換器的建模</span></p><p style="line-height: 2em;"><span style="font-size: 16px; font-family: 微軟雅黑, "Microsoft YaHei";"> 全橋式串聯(lián)諧振變換器的電路結構如圖1所示．</span></p><p style="text-align: center; line-height: 2em;"><img src="/ueditor/asp/upload/image/20170322/14901462022929990.jpg" title="clip_image002.jpg"/></p><p style="line-height: 2em;"><span style="font-size: 16px; font-family: 微軟雅黑, "Microsoft YaHei";"> 為了建立其精確的數學(xué)摸型，假設如下：①所有元器件均為理想器件；③濾波電容Cf足夠大．由其工作原理得出其精確非線(xiàn)性動(dòng)態(tài)電路模型．選用諧振環(huán)節電容電壓Vc、電感電流i和輸出電壓V0。作為狀態(tài) 變量，其狀態(tài)方程為</span></p><p style="text-align: center; line-height: 2em;"><img src="/ueditor/asp/upload/image/20170322/14901462162205991.jpg" title="clip_image004.jpg"/></p><p style="line-height: 2em;"><span style="font-size: 16px; font-family: 微軟雅黑, "Microsoft YaHei";"> 其中</span><img src="/ueditor/asp/upload/image/20170322/14901462278408873.jpg" title="clip_image006.jpg"/><span style="font-size: 16px; font-family: 微軟雅黑, "Microsoft YaHei";">的取值由sRc電路的電流連續的工作模式?jīng)Q定，分別為：</span></p><p style="line-height: 2em;"><span style="font-size: 16px; font-family: 微軟雅黑, "Microsoft YaHei";"> u=1電路工作在輸入功率模式下，諧振環(huán)節的電流持續增加;</span></p><p style="line-height: 2em;"><span style="font-size: 16px; font-family: 微軟雅黑, "Microsoft YaHei";"> u=0電路工作在自由衰減模式下，諧振環(huán)節的電流不斷減??；</span></p><p style="line-height: 2em;"><span style="font-size: 16px; font-family: 微軟雅黑, "Microsoft YaHei";"> u=0 電路工作在再生功率模式下，諧振環(huán)節的電流較自由衰減模式減小更快． </span></p><p style="line-height: 2em;"><span style="font-size: 16px; font-family: 微軟雅黑, "Microsoft YaHei";"> 為了達到簡(jiǎn)化和調整電壓的目的，本文只使用前兩種工作模式。將滑?？刂评碚搼糜谌珮蚴酱?lián)諧振變換器中的前提是建立適于變結構控制的模型，因此需將上述模型降階簡(jiǎn)化，重新選取諧振環(huán)節的電流i(其峰值電流為ip)與輸出電壓V0作為狀態(tài)變量。</span></p> </div> </div> <div id="yaqj8xyjh" class="p_n_more"> <a href="/technology/4009.html" title="如何正確選購直流接地故障檢測儀?">上一篇：如何正確選購直流接地故障檢測儀?</a> <a href="/technology/4007.html" title="串聯(lián)諧波諧振評估">下一篇：串聯(lián)諧波諧振評估</a> </div> <hr /> </div> </div> <div id="yaqj8xyjh" class="clear-both"></div> <footer class="container-fluid footer"> <div id="yaqj8xyjh" class="footer-top"> <div id="yaqj8xyjh" 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