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href="/info/industry/special/power">電源與新能源</a> > <a href="/info/articlelist/special/power/type/5">設(shè)計(jì)應(yīng)用</a> > 一種新型感應(yīng)加熱電源雙機(jī)并聯(lián)拓?fù)涞难芯?/p> </div> </div> </div>   <script src="https://forum.eepw.com.cn/jscontent/wenzilian" type="text/javascript"></script>  <div class="gjarbwc" id="container"> <section> <article> <h1>一種新型感應(yīng)加熱電源雙機(jī)并聯(lián)拓?fù)涞难芯?/h1> <div id="lzfhuek" class="authorTimeSource"> <span>作者：</span> <span>時(shí)間：2010-12-19</span> <span>來(lái)源：網(wǎng)絡(luò)</span> <link rel="stylesheet" type="text/css"/> <span style="float:right; width:150px;margin-right:0px; text-align:right;"> <div id="ogxkmhz" class="nav0"> <ul> <li style="width:150px;"><a href="javascript:void(0);"><img src="http://www.ex-cimer.com/event/action/images/icon_add_4.png" width="20" border="0" align="absmiddle" />英飛凌汽車電子生態(tài)圈</a> <ul> <li style="width:150px;text-align:center;"><img src="http://www.ex-cimer.com/event/company/images/code_2.jpg" width="150"><br />掃碼關(guān)注<br />獲取最新最全汽車電子<br />技術(shù)方案與實(shí)用技巧</li> </ul> </li> </ul> </div> </span> <span style="float:right; width:30px;margin-right:0px; text-align:right;"><a rel="nofollow">收藏</a></span> </div> <div id="onhrxlg" 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="qxvtonm" class="content" id="contentDiv" style="position:relative;"> <div id="twgbhvq" 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>現(xiàn)代<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/感應(yīng)"><em>感應(yīng)</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/加熱"><em>加熱</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電源"><em>電源</em></a>正朝著大功率,高頻化方向發(fā)展。這對(duì)現(xiàn)代電力電子器件來(lái)說(shuō)是一個(gè)相當(dāng)大的挑戰(zhàn)。傳統(tǒng)的方法是采用器件串并聯(lián)的方式,但這存在器件之間均流均壓閑難的問(wèn)題,特別是當(dāng)器件串并聯(lián)很多時(shí),則需要保證精確的同步信號(hào),以避免器件之間的環(huán)流損壞電力電子器件。但在很多情況下這很難精確保證。特別是當(dāng)串并聯(lián)器件較多功率等級(jí)很大,信號(hào)線上延時(shí)將對(duì)器件之間的環(huán)流產(chǎn)生惡劣的影響,所以采用器件申并聯(lián)的方式時(shí),器件數(shù)量、最大功率都將受到限制?；诖?一種<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/新型"><em>新型</em></a>的LLC<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/拓?fù)?><em>拓?fù)?/em></a>被提出,它的優(yōu)良特性可有效地減少逆變橋并聯(lián)之間的環(huán)流,通過(guò)參數(shù)設(shè)計(jì)可以均衡各橋的功率分配,降低器件的損耗,從而有效地解決了逆變橋并聯(lián)中出現(xiàn)的一些問(wèn)題,有利于<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/感應(yīng)"><em>感應(yīng)</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/加熱"><em>加熱</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電源"><em>電源</em></a>多橋并聯(lián),提高輸出功率和可靠性。</p>本文引用地址：<a href="http://www.ex-cimer.com/article/180074.htm">http://www.ex-cimer.com/article/180074.htm</a><p><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" height="310" src="http://editerupload.eepw.com.cn/fetch/20131009/180074_1_0.jpg" width="450" border="0" style="zoom: 1" alt="" /></p><p><br /><b>l 單機(jī)LLC分析</b><br /> 電壓型LLC負(fù)載<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/拓?fù)?><em>拓?fù)?/em></a>如圖1所示。由圖1可知,不同之處是在以往LC并聯(lián)負(fù)載基礎(chǔ)上再串聯(lián)一個(gè)電感L1,L2和R為<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/感應(yīng)"><em>感應(yīng)</em></a>圈的等效電路,通常L1比L2大很多,L1參與諧振并起到隔離負(fù)載和<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電源"><em>電源</em></a>,調(diào)節(jié)功率分配的作用?？梢?jiàn)它與傳統(tǒng)感應(yīng)<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/加熱"><em>加熱</em></a>電源中的負(fù)載匹配變壓器作用很相似,因而可以消除造價(jià)昂貴,效率不高的高頻變壓器,使得整個(gè)裝置的體積縮小、重量減輕。LLC諧振電路阻抗表達(dá)式為<br /> <img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" src="http://editerupload.eepw.com.cn/fetch/20131009/180074_1_1.jpg" border="0" style="width: 455px; zoom: 1; height: 49px" alt="" /><br />由基本的電路分析可得它有兩個(gè)諧振頻率, 一個(gè)是并聯(lián)諧振頻率f0和一個(gè)串聯(lián)諧振頻率f1</p><p> <img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" src="http://editerupload.eepw.com.cn/fetch/20131009/180074_1_2.jpg" border="0" style="zoom: 1" alt="" /></p><p>式中：Leq=L1//L2。<br /> 定義k=L1/L2,一般來(lái)說(shuō)k值較大以滿足負(fù)載匹配的要求,因此f0與f1很接近。為了獲得較大功率以及控制系統(tǒng)設(shè)計(jì)方便,系統(tǒng)的理想工作點(diǎn)在f1。Q=L2ωo/R≈L2ω1/R為了負(fù)載的品質(zhì)因數(shù){Q》]),將k》1,Q代入式(1),則在諧振點(diǎn)有</p><p> <img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" src="http://editerupload.eepw.com.cn/fetch/20131009/180074_1_3.jpg" border="0" style="width: 535px; zoom: 1; height: 311px" alt="" /></p><p>由式(3)可知在ω1、點(diǎn)電源工仵在感性狀態(tài)以保證開(kāi)關(guān)管可靠換流,且電容上電壓滯后逆變器輸出電壓90°?？梢宰C明在ω1點(diǎn)為輸出功率最大值。</p><p> <img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" src="http://editerupload.eepw.com.cn/fetch/20131009/180074_1_4.jpg" border="0" style="width: 511px; zoom: 1; height: 84px" alt="" /></p><p>由式(4)可看出電感L1起到阻抗變換,功率調(diào)節(jié)作用。系統(tǒng)功率曲線以及阻抗特性曲線如圖2所示。</p><p><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" height="270" src="http://editerupload.eepw.com.cn/fetch/20131009/180074_1_5.jpg" width="450" border="0" style="zoom: 1" alt="" /></p><p> 從圖2中可以看出φ(ω)在整個(gè)頻域內(nèi)是非單調(diào)函數(shù),這種特性不利于用鎖相環(huán)控制．相反θ(ω)=arg(vc/v1)卻呈單調(diào)變化特性,且在ω1點(diǎn)有θ(ω1)≈—90°,所以．θ(ω)可作為控制變量引入到PLL中,從而鎖定在A振點(diǎn)。電容上電壓最大值出現(xiàn)在諧振點(diǎn)ω1。 vc ≈v1Q/k (5)</p><p><br /><b>2 感應(yīng)加熱并聯(lián)模塊環(huán)流分析</b><br /> LLC諧振負(fù)載最大的優(yōu)點(diǎn)是有利于感應(yīng)加熱中的多機(jī)并聯(lián),它小需要在逆變器之間附加任何元件,即使各橋的信弓延時(shí)角度很大也能保證系統(tǒng)止常工作,抑制各橋之間的環(huán)流,調(diào)節(jié)各逆變器的輸出功率,多機(jī)并聯(lián)圖如圖3所示。</p><p><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" src="http://editerupload.eepw.com.cn/fetch/20131009/180074_1_6.jpg" border="0" style="width: 509px; zoom: 1; height: 467px" alt="" /></p><p> 假設(shè)各逆變器INV1至INVn工作在理想狀態(tài),即INV1至INVn對(duì)應(yīng)相同的驅(qū)動(dòng)信號(hào),有相同的直流電壓vdc,則多機(jī)并聯(lián)可以等效為單機(jī)的情況,轉(zhuǎn)換等式如式(6)。</p><p> <img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" src="http://editerupload.eepw.com.cn/fetch/20131009/180074_1_7.jpg" border="0" style="width: 490px; zoom: 1; height: 87px" alt="" /><br />實(shí)際控制中各個(gè)模塊的驅(qū)動(dòng)信號(hào)統(tǒng)一由控制板產(chǎn)生,但在傳輸信號(hào)的過(guò)程中,由于傳輸路線上的邏輯器件延遲,驅(qū)動(dòng)變壓器的延遲以及工藝方面的原因可能造成模塊之間驅(qū)動(dòng)信號(hào)的差異。這種延遲造成逆變器輸出電壓存在相位差,因此,<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/研究"><em>研究</em></a>它所產(chǎn)生的環(huán)流有實(shí)際意義,首先做出<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/雙機(jī)并"><em>雙機(jī)并</em></a>聯(lián)的等效電路如圖4所示。</p><p><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" src="http://editerupload.eepw.com.cn/fetch/20131009/180074_1_8.jpg" border="0" style="zoom: 1" alt="" /></p><p> 根據(jù)式(6)選取L11=L12=2L1,由于感應(yīng)加熱負(fù)載的高Q值,假定感應(yīng)圈中的電量均用正弦量,則有</p><p> <img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" src="http://editerupload.eepw.com.cn/fetch/20131009/180074_1_9.jpg" border="0" style="width: 494px; zoom: 1; height: 98px" alt="" /><br /><br />式中：zp為電容與感應(yīng)圈并聯(lián)等效阻抗。</span>  <div class="gcpgxhv" 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" /> <area shape="rect" coords="132,315,319,335" /> </map> </center> </div>  <span id="twfsyez" class="hAd8"> <br></span>  <div id="qtzflvy" class="quotes"> <span id="cfanavu" class="pre">上一頁(yè)</span> <span id="driompr" class="current">1</span> 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