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clearfix"><h1>寧波L9000冷光源主機芯片級維修誠信經(jīng)營成都鐳伙醫(yī)修平臺供應(yīng)</h1><div id="3gxpu3l" class="proBig"><div id="32r7ifh" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/leihuo/637397545673883737/8816967.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="jia32lx" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/leihuo/637397545673883737/8816967.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="7dpmj4x" 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>寧波L9000冷光源主機芯片級維修,L9000</p><p><span>***更新：</span>2020-12-13 09:13:54</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="rgikrqc" 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="k7pelfw" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="bf8kmta" class="box"><p><p> (連載18)反激式變壓器開關(guān)電源part1(連載01)開關(guān)電源的基本工作原理(連載02)串聯(lián)式開關(guān)電源輸出電壓濾波電路(連載03)串聯(lián)式開關(guān)電源儲能濾波電感的計算(連載04)串聯(lián)式開關(guān)電源儲能濾波電容的計算(2)(連載05)反轉(zhuǎn)式串聯(lián)開關(guān)電源(連載06)反轉(zhuǎn)式串聯(lián)開關(guān)電源儲能電感的計算(連載07)反轉(zhuǎn)式串聯(lián)開關(guān)電源儲能濾波電容的計算(連載08)并聯(lián)式開關(guān)電源的工作原理(連載09)并聯(lián)式開關(guān)電源輸出電壓濾波電路(連載10)并聯(lián)開關(guān)電源儲能電感的計算(連載11)單激式變壓器開關(guān)電源(連載12)單激式變壓器開關(guān)電源工作原理(連載13)正激式變壓器開關(guān)電源(連載14)正激式變壓器開關(guān)電源的優(yōu)缺點(連載15)正激式變壓器開關(guān)電源電路參數(shù)的計算(連載16)正激式開關(guān)電源變壓器參數(shù)的計算(連載17)正激式開關(guān)電源變壓器初、次級線圈匝數(shù)比的計算1-7．反激式變壓器開關(guān)電源反激式變壓器開關(guān)電源工作原理比較簡單，輸出電壓控制范圍比較大，因此，在一般電器設(shè)備中應(yīng)用廣大。1-7-1．反激式變壓器開關(guān)電源工作原理所謂反激式變壓器開關(guān)電源，是指當(dāng)變壓器的初級線圈正好被直流電壓激勵時，變壓器的次級線圈沒有向負(fù)載提供功率輸出，寧波L9000冷光源主機芯片級維修，寧波L9000冷光源主機芯片級維修，而*在變壓器初級線圈的激勵電壓被關(guān)斷后才向負(fù)載提供功率輸出。而作為醫(yī)院方，寧波L9000冷光源主機芯片級維修，尤其應(yīng)該明白發(fā)展第三方才是解決維修黑洞的一個出路，努力與第三方服務(wù)商探索合作。寧波L9000冷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="寧波L9000冷光源主機芯片級維修,L9000" src="https://tyunfile.71360.com/WaterMark/UploadFile/leihuo/637397545673883737/8816967.png"></div><p> 電源噪聲余計算非常簡單，方法如下：比如芯片正常工作電壓范圍為之間，穩(wěn)壓芯片標(biāo)稱輸出。安裝到電路板上后，穩(wěn)壓芯片輸出。那么容許電壓變化范圍為。穩(wěn)壓芯片輸出精度±1%，即±*1%=±m(xù)V。電源噪聲余為mV。計算很簡單，但是要注意四個問題：首先，穩(wěn)壓芯片輸出電壓能精確的定在么？外圍器件如電阻電容電感的參數(shù)也不是精確的，這對穩(wěn)壓芯片的輸出電壓有影響，所以這里用了這個值。在安裝到電路板上之前，你不可能預(yù)測到準(zhǔn)確的輸出電壓值。第二，工作環(huán)境是否符合穩(wěn)壓芯片手冊上的推薦環(huán)境？器件老化后參數(shù)還會和芯片手冊上的一致么？第三，負(fù)載情況怎樣？這對穩(wěn)壓芯片的輸出電壓也有影響。第四，電源噪聲終會影響到信號質(zhì)。而信號上的噪聲來源不**是電源噪聲，反射串?dāng)_等信號完整性問題也會在信號上疊加噪聲，不能把所有噪聲余都分配給電源系統(tǒng)。所以，在設(shè)計電源噪聲余的時候要留有余地。另一個重要問題是：不同電壓等級，對電源噪聲余要求不一樣，按±，電壓等級的噪聲余只有30mV。這是一個很苛刻的限制，設(shè)計的時候要謹(jǐn)慎些。模擬電路對電源的要求更高。電源噪聲影響時鐘系統(tǒng)，可能會引起時序匹配問題。因此必須重視電源噪聲問題。寧波L9000冷光源主機芯片級維修也有醫(yī)院財大氣粗，說不在乎那點維修費，但既然是財大的醫(yī)院，是不是該更多的為行業(yè)、為社會承擔(dān)一些責(zé)任？</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="寧波L9000冷光源主機芯片級維修,L9000" src="https://tyunfile.71360.com/UploadFile/leihuo/637397545676442254/9558237.png"></div><p> 為了讓大家有個清楚的認(rèn)識，本文分別介紹一下這兩種解釋。從儲能的角度來說明電容退耦原理。在制作電路板時，通常會在負(fù)載芯片周圍放置很多電容，這些電容就起到電源退耦作用。其原理可用圖1說明。當(dāng)負(fù)載電流不變時，其電流由穩(wěn)壓電源部分提供，即圖中的I0，方向如圖所示。此時電容兩端電壓與負(fù)載兩端電壓一致，電流Ic為0，電容兩端存儲相當(dāng)數(shù)的電荷，其電荷數(shù)和電容有關(guān)（C=Q/U）。當(dāng)負(fù)載瞬態(tài)電流發(fā)生變化時，由于負(fù)載芯片內(nèi)部晶體管電平轉(zhuǎn)換速度極快，必須在極短的時間內(nèi)為負(fù)載芯片提供足夠的電流。但是穩(wěn)壓電源無法很快響應(yīng)負(fù)載電流的變化，因此，電流I0不會馬上滿足負(fù)載瞬態(tài)電流要求，因此負(fù)載芯片電壓會降低。但是由于電容電壓與負(fù)載電壓相同，因此電容兩端存在電壓變化。對于電容來說電壓變化必然產(chǎn)生電流，此時電容對負(fù)載放電，電流Ic不再為0，為負(fù)載芯片提供電流。根據(jù)電容等式：只要電容C足夠大，只需很小的電壓變化，電容就可以提供足夠大的電流，滿足負(fù)載瞬態(tài)電流的要求。這樣就保證了負(fù)載芯片電壓的變化在容許的范圍內(nèi)。這里，相當(dāng)于電容預(yù)先存儲了一部分電能，在負(fù)載需要的時候釋放出來，即電容是儲能元件。儲能電容的存在使負(fù)載消耗的能得到快速補充。</p><p> 電源設(shè)計過程中確保正確使用冷卻風(fēng)扇的技巧因為更小的散熱片和更高的功率密度，使現(xiàn)代電源的熱管理變得越來越重要，現(xiàn)在的數(shù)據(jù)表都給出了必要的信息，設(shè)計師應(yīng)據(jù)此確保器件以大工作溫度工作時，電源工作溫度不會太高。一旦按照規(guī)定程序選擇出一款風(fēng)扇，在后配置中，應(yīng)當(dāng)對這些器件進(jìn)行后檢查。一旦器件溫度看起來將超過數(shù)據(jù)表中給定的值，則應(yīng)重新評估風(fēng)量和方向。大家知道，如果在一個密閉空間內(nèi)發(fā)散熱量，該空間內(nèi)的溫度會增加。也即，殼體內(nèi)的環(huán)境溫度會上升。如果有一個包含電源和其負(fù)載（即它供電的PCB）的殼體，隨著電源和其負(fù)載在散發(fā)熱，殼體內(nèi)的環(huán)境溫度會上升，進(jìn)而導(dǎo)致電源和其負(fù)載溫度的進(jìn)一步上升，從而可能超出其允許的高工作溫度。這是個糟糕的情況，熱是電子系統(tǒng)產(chǎn)生不可靠性、縮短使用壽命的首要因素，因為電解電容器的使用壽命與其工作溫度密切相關(guān)。隨著溫度的升高，其它器件的可靠性也降低；隨著散熱器越做越小、電源也越來越小的趨勢，必須對其進(jìn)行精細(xì)的熱管理。一個簡單方法，是使用風(fēng)扇從機體中吹出多余熱量。對可能采用對流冷卻設(shè)計的電源，或只能在較低溫度下工作的設(shè)備來說，需要遵循以下步驟計算風(fēng)量。完善醫(yī)療器械維修的相關(guān)法律法規(guī)，以規(guī)范醫(yī)療器械維修行為，保障用械安全。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="寧波L9000冷光源主機芯片級維修,L9000" src="https://tyunfile.71360.com/WaterMark/UploadFile/leihuo/637397545676442254/9558237.png"></div><p> 考慮到開關(guān)電源在實際應(yīng)用中可能會帶容性負(fù)載，L不宜過大，建議不超過μH。：鉗位吸收電路設(shè)計如圖8所示，反激變換器在MOS關(guān)斷的瞬間，由變壓器漏感LLK與MOS管的輸出電容造成的諧振尖峰加在MOS管的漏極，如果不加以限制，MOS管的壽命將會大打折扣。因此需要采取措施，把這個尖峰吸收掉。反激變換器設(shè)計中，常用圖9（a）所示的電路作為反激變換器的鉗位吸收電路（RCD鉗位吸收）。RClamp由下式?jīng)Q定，其中Vclamp一般比反射電壓Vor高出50～100V，LLK為變壓器初級漏感，以實測為準(zhǔn)：圖9RCD鉗位吸收CClamp由下式?jīng)Q定，其中Vripple一般取Vclamp的5%～10%是比較合理的：輸出功率比較小（20W以下）時，鉗位二極管可采用慢恢復(fù)二極管，如1N4007；反之，則需要使用快恢復(fù)二極管。：補償電路設(shè)計開關(guān)電源系統(tǒng)是典型的閉環(huán)控制系統(tǒng)，設(shè)計時，補償電路的調(diào)試占據(jù)了相當(dāng)大的工作量。目前流行于市面上的反激控制器，絕大多數(shù)采用峰值電流控制控制模式。峰值電流模式反激的功率級小信號可以簡化為一階系統(tǒng)，所以它的補償電路容易設(shè)計。通常，使用DeanVenable提出的TypeII補償電路就足夠了。在設(shè)計補償電路之前，首先需要考察補償對象（功率級）的小信號特性。如圖8所示。要求對維修后的醫(yī)療器械進(jìn)行專業(yè)檢測。寧波L9000冷光源主機芯片級維修</p><p style="text-indent:25px">一直以來，廠家的這種維修訴求、不透明的維修方式、高昂的配件價格都令醫(yī)院苦不堪言。寧波L9000冷光源主機芯片級維修</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(jìn)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。寧波L9000冷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(wù)型公司。公司自成立以來，以質(zhì)量為發(fā)展，讓匠心彌散在每個細(xì)節(jié)，公司旗下內(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)器械類維修深受客戶的喜愛。公司從事儀器儀表多年，有著創(chuàng)新的設(shè)計、強大的技術(shù)，還有一批**的專業(yè)化的隊伍，確保為客戶提供良好的產(chǎn)品及服務(wù)。成都鐳伙科技憑借創(chuàng)新的產(chǎn)品、專業(yè)的服務(wù)、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 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