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class="home-main container clearfix"><div id="tmynp2j" class="twoCol"><div id="7i8933x" class="page-proshow clearfix"><p class="current"> 當(dāng)前位置:<a href="http://www.cdcfah.com/">首頁?<a href="http://www.cdcfah.com/cp/">產(chǎn)品供應(yīng)</a>?<a href="http://www.cdcfah.com/cp/first-_yyby/">醫(yī)藥健康</a>?<a href="http://www.cdcfah.com/cp/second-yyby_ylsb/">醫(yī)療設(shè)備</a>?<a href="http://www.cdcfah.com/cp/third-ylsb_qtflpd/">其它未分類</a>??？谑焚惪薒9000冷光源更換燈泡客戶至上成都鐳伙醫(yī)修平臺供應(yīng)</p><div id="mlxzb9q" class="leftbox clearfix"><h1>?？谑焚惪薒9000冷光源更換燈泡客戶至上成都鐳伙醫(yī)修平臺供應(yīng)</h1><div id="8ujqxr7" class="proBig"><div id="jsuw7fb" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/leihuo/637397545673883737/8816967.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="pjbtymv" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/leihuo/637397545673883737/8816967.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="fphel22" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>四川省</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>?？谑焚惪薒9000冷光源更換燈泡,L9000</p><p><span>***更新：</span>2021-02-02 08:09:14</p><p><span id="click" >瀏覽次數(shù)：1次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="3hjqxbn" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">成都鐳伙科技有限公司</a></p><p><span>聯(lián)系人：</span>邱鋒</p><p><span>郵箱: </span>cdleihuokeji@163.com</p><p><span>電話: </span>13982269628</p><p><span>傳真: </span>028_</p><p><span>網(wǎng)址: </span></p><p><span>手機: </span>028-8444323</p><p><span>地址: </span>新都區(qū)踏水路創(chuàng)想大廈2單元2606</p><p>[當(dāng)前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="ei2l43g" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="qfcegnu" class="box"><p><p> 1引言開關(guān)電源的設(shè)計是一份非常耗時費力的苦差事，需要不斷地修正多個設(shè)計變量，直到性能達到設(shè)計目標(biāo)為止。本文step-by-step介紹反激變換器的設(shè)計步驟，并以一個隔離雙路輸出的反激變換器設(shè)計為例，主控芯片采用NCP1015，?？谑焚惪薒9000冷光源更換燈泡?；镜姆醇ぷ儞Q器原理圖如圖1所示，在需要對輸入輸出進行電氣隔離的低功率（1W～60W）開關(guān)電源應(yīng)用場合，反激變換器（FlybackConverter）是常用的一種拓?fù)浣Y(jié)構(gòu)（Topology）。簡單、可靠、低成本、易于實現(xiàn)是反激變換器突出的優(yōu)點。2設(shè)計步驟接下來，參考圖2所示的設(shè)計步驟，一步一步設(shè)計反激變換器：初始化系統(tǒng)參數(shù)------輸入電壓范圍：Vinmin_AC及Vinmax_AC------電網(wǎng)頻率：fline（國內(nèi)為50Hz）------輸出功率：（等于各路輸出功率之和）------初步估計變換器效率：η（低壓輸出時，η取～，高壓輸出時，η取～）根據(jù)預(yù)估效率，估算輸入功率：對多路輸出，定義KL（n）為第n路輸出功率與輸出總功率的比值：單路輸出時，KL（n）=：確定輸入電容CbulkCbulk的取值與輸入功率有關(guān)，通常，對于寬輸入電壓（85～265VAC），取2～3μF/W；對窄范圍輸入電壓（176～265VAC），取1μF/W即可，海口史賽克L9000冷光源更換燈泡，電容充電占空比Dch一般取即可，?？谑焚惪薒9000冷光源更換燈泡。同時也不是注冊證中“結(jié)構(gòu)及組成”所限定的內(nèi)容，或未改變“結(jié)構(gòu)及組成”所限定的內(nèi)容.?？谑焚惪薒9000冷光源更換燈泡</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="?？谑焚惪薒9000冷光源更換燈泡,L9000" src="https://tyunfile.71360.com/UploadFile/leihuo/637397545673883737/8816967.png"></div><p> 概述開關(guān)電源的瞬態(tài)分析與綜合方法有時域法和頻域法兩種。綜合的主要任務(wù)有兩個：一個是設(shè)計開關(guān)電源的電壓與電流控制器（也稱補償器）；二是選定補償網(wǎng)絡(luò)的元件參數(shù)。開關(guān)電源是一個非線性閉環(huán)系統(tǒng)，瞬態(tài)性能與控制變量之間表現(xiàn)出很強的非線性關(guān)系，所建立的是非線性模型（也稱大信號模型）。利用頻域模型（如方塊圖、傳遞函數(shù)等），在復(fù)頻域（S域）內(nèi)對開關(guān)電源進行交流小信號分析（或仿真）的終目的是要檢驗系統(tǒng)的時域性能指標(biāo)是否滿足要求。頻域分析的方法包括零點極點分析、頻域特性和頻率響應(yīng)分析等。開關(guān)電源系統(tǒng)的頻域綜合分析的一般步驟（1）確定控制方法，電壓型控制或電流型控制；（2）畫出閉環(huán)系統(tǒng)應(yīng)有（希望）的Bode圖；（3）畫出變換器功率級電路、電壓檢測（分壓器）、脈寬調(diào)制器、驅(qū)動電路等的Bode圖；（4）將步驟（2）、步驟（3）所得的兩個Bode圖相減，就可以得到補償網(wǎng)絡(luò)應(yīng)有的Bode圖，可以根據(jù)該Bode圖來確定補償網(wǎng)絡(luò)的主電路和元件參數(shù)，因此開關(guān)電源系統(tǒng)的設(shè)計問題歸結(jié)為控制電路中補償網(wǎng)絡(luò)的設(shè)計問題。時域法綜合分析系統(tǒng)的步驟用時域法綜合確定自定調(diào)節(jié)系統(tǒng)的控制器（或補償網(wǎng)絡(luò)）參數(shù)的步驟如下：（1）當(dāng)開關(guān)電源初步設(shè)計完成后。?？谑焚惪薒9000冷光源更換燈泡對維修后的醫(yī)療器械進行檢測維修后的醫(yī)療器械不*要達到能夠使用的標(biāo)準(zhǔn)，維修前的醫(yī)療器械效果一致且安全。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="?？谑焚惪薒9000冷光源更換燈泡,L9000" src="https://tyunfile.71360.com/WaterMark/UploadFile/leihuo/637397545673444203/1027525.png"></div><p> 然而過小的KRF會增大變壓器的體積，設(shè)計時需要反復(fù)衡量。一般而言，設(shè)計CCM模式的反激變換器，寬壓輸入時（90～265VAC），KRF取～；窄壓輸入時（176～265VAC），KRF取～即可。一旦Lm確定，流過MOS管的電流峰值Idspeak和均方根值Idsrms亦隨之確定：其中：設(shè)計中，需保證Idspeak不超過選用MOS管大電流值80%，Idsrms用來計算MOS管的導(dǎo)通損耗Pcond，Rdson為MOS管的導(dǎo)通電阻。：選擇合適的磁芯以及變壓器初級電感的匝數(shù)開關(guān)電源設(shè)計中，鐵氧體磁芯是應(yīng)用廣大的一種磁芯，可被加工成多種形狀，以滿足不同的應(yīng)用需求，如多路輸出、物理高度、優(yōu)化成本等。實際設(shè)計中，由于充滿太多的變數(shù)，磁芯的選擇并沒有非常嚴(yán)格的限制，可選擇的余地很大。其中一種選型方式是，我們可以參看磁芯供應(yīng)商給出的選型手冊進行選型。如果沒有合適的參照，可參考下表：選定磁芯后，通過其Datasheet查找Ae值，及磁化曲線，確定磁通擺幅△B，次級線圈匝數(shù)由下式確定：其中，DCM模式時，△B取～；CCM時，△B取～。：確定各路輸出的匝數(shù)先確定主路反饋繞組匝數(shù)，其他繞組的匝數(shù)以主路繞組匝數(shù)作為參考即可。</p><p> 前言降低變壓器的發(fā)熱，不*可以簡化散熱與風(fēng)冷設(shè)計，降低散熱成本，還可提高整機的效率與工作可靠性，所以一直是人們不斷追求與探索的目標(biāo)方向。變壓器溫度過高常見的9個對策對減少高頻變壓器工作時的發(fā)熱與溫升，我們熟知的常用方法措施有：1選擇合適的磁芯、骨架的形狀類型，以EER35-42與EE40這兩種造形結(jié)構(gòu)的磁性材為例，兩者可用功率相近，但在相同輸出功率使用時，由于EER35-42無論線包還是鐵氧體的熱交換表面積比EE40更大，所以工作時的溫升明顯要比EE40來得更低些。2選用高性能低損耗的高頻鐵氧體磁芯材料，合理選取鐵芯在對應(yīng)工作頻率Fs下的磁擺幅ΔB。3合理選取繞組導(dǎo)線電流密度J，當(dāng)然不**是DC電流密度，更重要的是其AC電流密度。4繞組線材類型的合理選取，如多股并聯(lián)、里茲線、銅箔等，就比同等截面積的單根漆包線有更低的高頻交流阻抗。5線圈繞制結(jié)構(gòu)改進與分布參數(shù)的有效控制，有雙線并行繞法（增強互感）、層間“Z”型繞法（減小層間壓差）、分段繞法（減少分布電容、降低AC阻抗）、P/S“三明治”交叉換位（減小漏感）、P/S多槽交叉換位繞法等等。6防止磁路氣隙處漏磁通引起的損耗發(fā)熱，可限制氣隙間距，或采用特種氣隙結(jié)構(gòu)，使氣隙遠(yuǎn)離繞組線包等等。給予公平的競爭機會，其實這雖是給第三方機會，又何嘗不是自救，只有雙方共同發(fā)展，才能走向共贏。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="?？谑焚惪薒9000冷光源更換燈泡,L9000" src="https://tyunfile.71360.com/WaterMark/UploadFile/leihuo/637397545673883737/8816967.png"></div><p> 如為長時間連續(xù)工作狀況，則兩種波形時的溫升差別之大就不難想象了。需要特別提一下的是，用增加變壓器漏感的方法來改善“原邊開關(guān)管導(dǎo)通時的尖峰振蕩”在大多數(shù)情況下會是得不償失的，例如在正激拓?fù)渲?，因漏感儲?*終將在“開關(guān)管關(guān)斷瞬間以反激方式釋能”，此時對圖1、圖2中的副邊D3與原邊DQ1、DQ2、D1、D2而言（不難推斷出橋式圖3圖4的情況），又將出現(xiàn)關(guān)斷尖峰振蕩，漏感儲能越大，則關(guān)斷尖峰越高，對降低變壓器工作溫升一樣不利。對二極管的關(guān)斷尖峰振蕩，一般可用原邊加RC或RCD緩沖加以吸收。在前述的48KHz3KW實驗電源中試驗增加恰當(dāng)?shù)腞CD緩沖吸收電路，對改善開關(guān)管關(guān)斷時出現(xiàn)的“二極管尖峰振蕩”具有較明顯的作用效果。對有無RCD緩沖吸收電路（圖1圖2中的R1、C1、DR1及R2、C2、DR2）做無風(fēng)冷滿載工作2分鐘后的實驗測試表明，繞組線包溫升相差達攝氏6~7度?。ōh(huán)境溫度為25度時）。需要說明的是，增加RCD后對變壓器溫升的改善也可能不**完全是對二極管關(guān)斷尖峰振蕩控制所起的作用，可能還有一些其它未曾搞清的因素存在。另外，在電路中增加RCD緩沖屬“有損”尖峰吸收方法，因此也有人把它的作用看做是一種能量轉(zhuǎn)移消耗，只是把變壓器與開關(guān)管的發(fā)熱轉(zhuǎn)移到了R上。作為部門、學(xué)術(shù)機構(gòu)，可能需要政策上傾斜引導(dǎo)、資源上整合扶持；海口史賽克L9000冷光源更換燈泡</p><p style="text-indent:25px">既不會修別的廠家的產(chǎn)品，更不可能站在院方角度考慮全院所有設(shè)備的管理使用。?？谑焚惪薒9000冷光源更換燈泡</p><p> wp）放置于fcross的k倍處，可由下式計算出Cpole:-------補償網(wǎng)絡(luò)零點（wz）放置于fcross的1/k倍處，可由下式計算出Cz：3仿真驗證計算機仿真不*可以取代系統(tǒng)的許多繁瑣的人工分析，減輕勞動強度，避免因為解析法在近似處理中帶來的較大誤差，還可以與實物調(diào)試相互補充，大限度的降低設(shè)計成本，縮短開發(fā)周期。本例采用經(jīng)典的電流型控制器UC3843（與NCP1015控制原理類似），搭建反激變換器。其中，變壓器和環(huán)路補償參數(shù)均采用上文的范例給出的計算參數(shù)。仿真測試條件：低壓輸入（90VAC，雙路滿載）1.原理圖圖17仿真原理圖2.瞬態(tài)信號時域分析從圖18可以看出，低Cbulk上的低電壓為，與理論值98V大致相符。3.交流信號頻域分析4.動態(tài)負(fù)載波形測試測試條件：低壓輸入，滿載，主路輸出電流，間隔，測試輸出電壓波形。4PCB設(shè)計指導(dǎo)，走線要寬。（di/dt、dv/dt）走線a．整流二級，鉗位吸收二極管，MOS管與變壓器引腳，這些高頻處，引線應(yīng)盡可能短，layout時避免走直角；b．MOS管的驅(qū)動信號，檢流電阻的檢流信號，到控制IC的走線距離越短越好；c．檢流電阻與MOS和GND的距離應(yīng)盡可能短。：a.所有小信號GND與控制IC的GND相連后，連接到PowerGND（即大信號GND）；b.反饋信號應(yīng)**走到IC。?？谑焚惪薒9000冷光源更換燈泡</p><p style="text-indent:25px">成都鐳伙科技有限公司主要經(jīng)營范圍是儀器儀表，擁有一支專業(yè)技術(shù)團隊和良好的市場口碑。成都鐳伙科技致力于為客戶提供良好的內(nèi)窺鏡以及維修周邊，動力系統(tǒng)及手柄附件維修，攝像系統(tǒng)主機及攝像頭維修，手術(shù)器械類維修，一切以用戶需求為中心，深受廣大客戶的歡迎。公司將不斷增強企業(yè)重點競爭力，努力學(xué)習(xí)行業(yè)知識，遵守行業(yè)規(guī)范，植根于儀器儀表行業(yè)的發(fā)展。成都鐳伙科技立足于全國市場，依托強大的研發(fā)實力，融合前沿的技術(shù)理念，飛快響應(yīng)客戶的變化需求。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/3125075.html</p></div></div></div></div></div><div id="jyax74p" class="page-right twoColRt"><div id="datg2wx" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="mwtvxjl" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" alt="福建ZF配件哪家強信息推薦自業(yè)物資供應(yīng)" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></div><p>福建ZF配件哪家強信息推薦自業(yè)物資供應(yīng)</p></a></div><div id="2zvspw3" class="recomPic likePro"><a 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