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#f30;"></span></p><p><span>產品關鍵詞：</span>茂名史賽克L9000光源主機芯片級維修,L9000</p><p><span>***更新：</span>2021-01-14 02:11:21</p><p><span id="click" >瀏覽次數：0次</span></p><a rel="nofollow" class="button">聯系我們</a></div></div><div id="2frn83b" 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="333zgik" class="page-proshow02"><p class="title">詳細說明</p><div id="konogxp" class="box"><p><p> 7單個變壓器分散成多個變壓器組合。如EE55C（21mm厚）分開為兩個EER49，同樣輸出功率，同樣散熱條件，溫升至少可以下降攝氏10度以上。8強制空氣對流散熱（風冷）。9液（油）冷散熱。以上第1條至第7條所講的是一些為大家所熟知的，茂名史賽克L9000光源主機芯片級維修，也是行之有效的常用方法。而第8第9則是指散熱方法。當然，也見到過一些較為特別的散熱構造方法，如將繞組銅箔即做繞組導線用，引出至線包外又做散熱片用，將兩者功能合二為一的設計方法；也有將低感量大電流的濾波電感繞組導線做成類似散熱器造形的“多表面積”結構，同時即置于磁路中，又處于風道中，有利與熱交換，也改善了“集膚”效應，茂名史賽克L9000光源主機芯片級維修，見圖片…等等。理論與實踐解析高頻變壓器發(fā)熱機理與對策然而在設計實踐中，往往會遇到已做足了上述的各個環(huán)節(jié)的功夫，但變壓器工作時的發(fā)熱還是減不下來的情形，此時說明還存在一些容易被忽視的，茂名史賽克L9000光源主機芯片級維修、會導致變壓器發(fā)熱的其它相關因素存在。當遇到變壓器設計已“沒啥問題”而工作溫度卻又降不下來時，我們已有必要把目光從變壓器轉移到外圍電路的“器件特性”上來，其實來自外圍器件引起的“與變壓器互為作用”而導致的工作溫升過高，在變壓器發(fā)熱的因素中也占有相當的比重，畢竟對整個電源而言。經調查發(fā)現更換的球管未經注冊，定性為無證經營無產品注冊證書的醫(yī)療器械案。茂名史賽克L9000光源主機芯片級維修</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="茂名史賽克L9000光源主機芯片級維修,L9000" src="https://tyunfile.71360.com/UploadFile/leihuo/637397545673444203/1027525.png"></div><p> 直接將L1直接短路即可，推導該補償網絡的傳遞函數G(s)為：其中：CTR為光耦的電流傳輸比，Rpullup為光耦次級側上拉電阻（對應NCP1015，Rpullup=18kΩ），Cop為光耦的寄生電容，與Rpullup的大小有關。圖13（來源于SharpPC817的數據手冊）是光耦的頻率響應特性，可以看出，當RL（即Rpullup）為18kΩ時，將會帶來一個約2kHz左右的極點，所以Rpullup的大小會直接影響到變換器的帶寬。kFactor（k因子法）是DeanVenable在20世紀80年代提出來的，提供了一種確定補償網絡參數的方法。如圖14所示，將TypeII補償網絡的極點wp放到fcross的k倍處，將零點wz放到fcross的1/k處。圖12的補償網絡有三個參數需要計算：RLed，Cz，Cpole，下面將用kFactor計算這些參數：-------確定補償后的環(huán)路帶寬fcross：通過限制動態(tài)負載時（△Iout）的輸出電壓過沖量（或下沖量）△Vout，由下式決定環(huán)路帶寬：-------考察功率級的傳函特性，確定補償網絡的中頻帶增益（Mid-bandGain）：-------確定DeanVenable因子k：選擇補償后的相位裕量PM（一般取55°～80°），由公式32得到fcross處功率級的相移（可由Mathcad計算）PS，則補償網絡需要提升的相位Boost為：則k由下式決定：-------補償網絡極點。茂名史賽克L9000光源主機芯片級維修維修在某種程度上與生產具有一定的聯系和相似性的。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="茂名史賽克L9000光源主機芯片級維修,L9000" src="https://tyunfile.71360.com/WaterMark/UploadFile/leihuo/637397545676442254/9558237.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“原邊開關管導通時的尖峰振蕩”在大多數情況下會是得不償失的，例如在正激拓撲中，因漏感儲能**終將在“開關管關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），又將出現關斷尖峰振蕩，漏感儲能越大，則關斷尖峰越高，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的RCD緩沖吸收電路，對改善開關管關斷時出現的“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！（環(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移消耗，只是把變壓器與開關管的發(fā)熱轉移到了R上。</p><p> 氣隙與漏感磁芯飽和就相當于變壓器的一次側是個空心線圈（相當于短路），它的電流會很大，一直上升到燒壞變壓器或者保險管為止。磁芯氣隙是磁芯空氣間隙的簡稱，一般鐵氧體，和硅鋼的磁芯都不是一個整體的閉合體，是由E字體對接的對接口處有意無意留下的間隙就是磁芯氣隙，所以人們不需要磁芯氣隙時可以采用環(huán)型變壓器，用到磁芯氣隙時就故意加大對接的缺口，或在缺口處墊非導磁材料，如高溫紙。高頻變壓器才開氣隙，是為了防止鐵芯磁飽合，因為UPS中有高次詣波，所以要開氣隙，但變壓器開氣隙的原理和電感是不一樣的。變壓器都是硅鋼片拼成的，兩個對著的硅鋼片之間的間隙叫氣隙。氣隙大了當然磁阻就大了。變壓器留氣隙是為了防止在工作中產生磁飽和！氣隙是在鐵芯交合處留的縫隙!和繞線無關。有了氣隙的確是增加了磁阻，但卻是有益的！氣隙的作用是減小磁導率，使線潿特性較少地依賴于磁芯材料的起始磁導率。氣隙可以避免在交流大信號或直流偏置下的磁飽和現象，更好地控制電感量。然而，在氣隙降低磁導率的情況下要求線圈圈數較多，相關的銅損也增加，所以需要適當的折中。一般反激式電源,在氣隙較小時,氣隙越小,功率越小,氣隙越大,功率越大。既不會修別的廠家的產品，更不可能站在院方角度考慮全院所有設備的管理使用。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="茂名史賽克L9000光源主機芯片級維修,L9000" src="https://tyunfile.71360.com/WaterMark/UploadFile/leihuo/637397545673883737/8816967.png"></div><p> 2．對于某些應用場合，非儲能變壓器不用開氣隙，直接把窗口面積繞滿；但通常受到體積、成本的限制，我們總是用盡可能小的磁芯出盡可能大的功率，此時好也開一點氣隙，這樣磁場強度小幅擾動時不容易發(fā)生飽和現象；3．電流產生磁場，磁場傳遞能量或者儲存能量，功率的傳遞過程：電能-磁能-電能。一般，氣隙小可能導致變壓器飽和；氣隙大，將使整個電源負載特性變軟，空載和滿載輸出電壓變化變大，另外紋波尤其是毛刺加大。磁芯的磁導率遠大于空氣，根據H=B/u可以看出，u越小磁場強度H越強，而磁芯存儲的能量與H成正比，W=VuH2/2，V是體積，u磁導率，所以說氣隙存儲了大部分的能量。磁滯回線中的H是原邊勵磁電流所產生的磁場強度H(Io)和原邊抗副邊電流所產生的H(I1)及副也電流所產生的H(I2)的矢量和。即H=H(Io)+H(I1)+H(I2)的矢量和，而H(I1)=-H(I2)，即H=H(Io)，所以磁滯回線中的H為H(Io)，那么它所對應的電流是Io，而不是Io+I1。加氣隙提高飽和N*I，變壓器大部分能量存儲在氣隙中，氣隙越大，變壓器能存儲的能量越大，故不容易飽和，變壓器磁芯儲能能力E=*B*V*H.,加入氣隙后，H是磁芯和空氣部分等效He?？招木€圈**飽和，故加入氣隙后，整個磁路具有一點空氣特性。維修中替換的部件按醫(yī)療器械管理但未經注冊 .廣州史賽克STRYKERL9000冷光源更換燈泡</p><p style="text-indent:25px">第三方服務商、醫(yī)療機構三方面共同努力。茂名史賽克L9000光源主機芯片級維修</p><p> 原邊開關管也好，副邊整流管也好，吸收補償也好，諧振回路（電感或電容）也好，甚至PFC及濾波電容，PCB布線等，與變壓器都同屬一個整體，其工作狀態(tài)必定會是相互關聯又互相影響的，只是影響作用的強弱而已。其中對變壓器工作溫升影響比較大的是副邊整流(續(xù)流)二極管的反向恢復特性，以常見大功率電源為例（也不難分析小功率反激副變整流二極管的工作狀況），無論是橋式拓撲副邊的兩個全波整流二極管，或是正激拓撲的整流與續(xù)流二極管，在反向恢復期內都會產生瞬時共態(tài)導通現象，從而在漏感上引起幅度遞減的正弦（有時并非完全是正弦）尖峰振蕩，這個比開關頻率高得多且有較高電壓峰值的振蕩波會在原副邊之間相互耦合，額外地使線包、磁芯的各種損耗增加，尤其是與頻率成指數比例關系的損耗，增加得更為明顯。因為在二極管“共態(tài)導通”瞬間的首先個尖峰波時段內，原邊勵磁電感量下降到了接近于：“短路副邊測得原邊的漏感值”，如遇處理不當，則原邊的瞬時峰值電流將超過正常工作時的數倍至十數倍！這時磁芯的磁擺幅△B將增大，繞組導線的高頻電流密度也急劇增加，在過后的衰減振蕩過程里，雖然損耗是遞減的，但整個尖峰衰減振蕩是隨著工作頻率周而復始地產生的。茂名史賽克L9000光源主機芯片級維修</p><p style="text-indent:25px">成都鐳伙科技有限公司致力于儀器儀表，是一家服務型的公司。成都鐳伙科技致力于為客戶提供良好的內窺鏡以及維修周邊，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，努力學習行業(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。成都鐳伙科技憑借創(chuàng)新的產品、專業(yè)的服務、眾多的成功案例積累起來的聲譽和口碑，讓企業(yè)發(fā)展再上新高。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2834625.html</p></div></div></div></div></div><div id="dg7rykm" class="page-right twoColRt"><div id="ts9dkbn" 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