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#f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>長沙L9000冷光源更換燈泡,L9000</p><p><span>***更新：</span>2021-01-14 10:12:56</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="eiurtxt" 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(jī): </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="cgdamyv" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="xg3b87d" class="box"><p><p> 2．對于某些應(yīng)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(qiáng)度小幅擾動時不容易發(fā)生飽和現(xiàn)象；3．電流產(chǎn)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(dǎo)致變壓器飽和；氣隙大，將使整個電源負(fù)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(dǎo)率遠(yuǎn)大于空氣，根據(jù)H=B/u可以看出，u越小磁場強(qiáng)度H越強(qiáng)，長沙L9000冷光源更換燈泡，而磁芯存儲的能量與H成正比，W=VuH2/2，V是體積，u磁導(dǎo)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(chǎn)生的磁場強(qiáng)度H(Io)和原邊抗副邊電流所產(chǎn)生的H(I1)及副也電流所產(chǎn)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(yīng)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，長沙L9000冷光源更換燈泡，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。給予公平的競爭機(jī)會，其實這雖是給第三方機(jī)會，又何嘗不是自救，長沙L9000冷光源更換燈泡，只有雙方共同發(fā)展，才能走向共贏。長沙L9000冷光源更換燈泡</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="長沙L9000冷光源更換燈泡,L9000" src="https://tyunfile.71360.com/UploadFile/leihuo/637397545673883737/8816967.png"></div><p> 一些電源被設(shè)計成使用系統(tǒng)風(fēng)扇進(jìn)行強(qiáng)制冷卻。在這種情況下，電源的數(shù)據(jù)表會給出充分冷卻所需的風(fēng)量。重要的是要記住：這是電源本身所需的風(fēng)量，而不是某個點（即便離電源很近）的。因為空氣將始終沿著阻力小的路徑流通，所以，風(fēng)扇吹動的風(fēng)量只有一部分將實際到達(dá)需降溫的電源。內(nèi)部擋板將有助于引導(dǎo)空氣沿所需的路徑到達(dá)需冷卻的目標(biāo)器件。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。首先，確定電源或電子設(shè)備可以安全工作的大操作溫度。對于電源本身來說，通常50℃這個溫度通?？赡軙婕鞍踩J(rèn)證，降低溫度以延長壽命。根據(jù)經(jīng)驗，一般情況，將電解電容器外殼溫度降低10℃，其使用壽命將延長一倍。然后，我們需考慮包含電源的設(shè)備外殼周圍的高氣溫；外殼周圍的高氣溫與高工作溫度之間的差就是大允許溫升。例如，如果電源可在50℃環(huán)境下工作，且若包含電源的設(shè)備工作在非空調(diào)環(huán)境，且環(huán)境高溫度可達(dá)40℃，則電源允許的溫升為10℃。下一步是確定待散熱的功耗。機(jī)殼內(nèi)的總功耗是由負(fù)載功耗加上電源自身發(fā)熱的功耗的總和。例如，如果電子電路的負(fù)載標(biāo)稱為260W，假定電源的效率是80％，則散發(fā)的總熱量為260W/，即325W。后。長沙L9000冷光源更換燈泡體外循環(huán)機(jī)、呼吸機(jī)、麻醉機(jī)、監(jiān)護(hù)儀等醫(yī)療器械的維修更是如此。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="長沙L9000冷光源更換燈泡,L9000" src="https://tyunfile.71360.com/WaterMark/UploadFile/leihuo/637397545673444203/1027525.png"></div><p> b）所示，MOS管關(guān)斷時，輸入電壓Vin與次級反射電壓nVo共同疊加在MOS的DS兩端。大占空比Dmax確定后，反射電壓Vor（即nVo）、次級整流二極管承受的大電壓VD以及MOS管承受的大電壓Vdsmax，可由下式得到：通過公式（5）（6）（7），可知，Dmax取值越小，Vor越小，進(jìn)而MOS管的應(yīng)力越小，然而，次級整流管的電壓應(yīng)力卻增大。因此，我們應(yīng)當(dāng)在保證MOS管的足夠裕量的條件下，盡可能增大Dmax，來降低次級整流管的電壓應(yīng)力。Dmax的取值，應(yīng)當(dāng)保證Vdsmax不超過MOS管耐壓等級的80%；同時，對于峰值電流模式控制的反激變換器，CCM模式條件下，當(dāng)占空比超過時，會發(fā)生次諧波震蕩。綜合考慮，對于耐壓值為700V（NCP1015）的MOS管，設(shè)計中，Dmax不超過為宜。：確定變壓器初級電感Lm對于CCM模式反激，當(dāng)輸入電壓變化時，變換器可能會從CCM模式過渡到DCM模式，對于兩種模式，均在惡劣條件下（低輸入電壓、滿載）設(shè)計變壓器的初級電感Lm。由下式?jīng)Q定：其中，fsw為反激變換器的工作頻率，KRF為電流紋波系數(shù)，其定義如下圖所示：對于DCM模式變換器，設(shè)計時KRF=1。對于CCM模式變換器，KRF<1，此時，KRF的取值會影響到初級電流的均方根值（RMS），KRF越小，RMS越小，MOS管的損耗就會越小。</p><p> 電路在諧振時容抗等于感抗，所以電容和電感上兩端的電壓有效值必然相等，電容上的電壓有效值UC=I*1/ωC=U/ωCR=QU，品質(zhì)因數(shù)Q=1/ωCR，這里I是電路的總電流。電感上的電壓有效值UL=ωL*I=ωL*U/R=QU，品質(zhì)因數(shù)Q=ωL/R。因為：UC=UL所以Q=1/ωCR=ωL/R。電容上的電壓與外加信號電壓U之比UC/U=（I*1/ωC）/RI=1/ωCR=Q。電感上的電壓與外加信號電壓U之比UL/U=ωLI/RI=ωL/R=Q。從上面分析可見，電路的品質(zhì)因數(shù)越高，電感或電容上的電壓比外加電壓越高。Q值影響電路的頻率選擇性。當(dāng)電路處于諧振頻率時，有大的電流，偏離諧振頻率時總電流小。我們用I/I0表示通過電路的電流與諧振電路中電流的比值，即相對變化率。ω/ω0表示頻率偏離諧振頻率程度。圖6顯示了I/I0與ω/ω0關(guān)系曲線。這里有三條曲線，對應(yīng)三個不同的Q值，其中有Q1>Q2>Q3。從圖中可看出當(dāng)外加信號頻率ω偏離電路的諧振頻率ω0時，I/I0均小于1。Q值越高在一定的頻偏下電流下降得越快，其諧振曲線越尖銳。也就是說電路的選擇性是由電路的品質(zhì)因素Q所決定的，Q值越高選擇性越好。在電路板上會放置一些大的電容，通常是坦電容或電解電容。這類電容有很低的ESL，但是ESR很高，因此Q值很低。國內(nèi)統(tǒng)計醫(yī)療設(shè)備的質(zhì)量問題所引起的醫(yī)療事故占所有事故的17%。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="長沙L9000冷光源更換燈泡,L9000" src="https://tyunfile.71360.com/WaterMark/UploadFile/leihuo/637397545676442254/9558237.png"></div><p> 電容充電，存儲一部分電荷。當(dāng)非門發(fā)生翻轉(zhuǎn)瞬間，電容放電，形成瞬間的浪涌電流，方向如圖9中虛線所示。這樣電路轉(zhuǎn)換所需的瞬態(tài)電流不必再由VCC提供，電容相當(dāng)于局部小電源。因此電源端和地端的寄生電感被旁路掉了，寄生電感在這一瞬間沒有電流流過，因而也不存在感應(yīng)電壓，這就保證了首先個非門輸出信號的邏輯電平值的正確性。所需電容可能不是一個，通常是兩個或多個電容并聯(lián)放置，小電容本身的串聯(lián)電感，進(jìn)而小電容充放電回路的阻抗。電容的擺放、安裝距離、安裝方法、電容選擇等問題，本文后面會詳細(xì)介紹。很多芯片制造商在參考設(shè)計中給出的都是這種局部去耦方式，但并不是說這種方式就是優(yōu)的。芯片商關(guān)心的是如何提高他所提供的特定器件的性能，也就是說，著眼點在器件本身，并沒有從整個電路系統(tǒng)的角度來處理電源去耦的問題。有時你會發(fā)現(xiàn)，對一個的電源和地引腳都單獨去耦是不現(xiàn)實的，可能是空間限制，放不下如此多的電容，也可能是成本限制。因此對于板級集成的工程師來說，除了要熟悉局部去耦的方法外，還要深入研究如何從整個電源分配系統(tǒng)的角度進(jìn)行電源去耦設(shè)計。對維修后的醫(yī)療器械進(jìn)行檢測維修后的醫(yī)療器械不僅要達(dá)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。長沙L9000冷光源更換燈泡</p><p style="text-indent:25px">經(jīng)調(diào)查發(fā)現(xiàn)更換的球管未經(jīng)注冊，定性為無證經(jīng)營無產(chǎn)品注冊證書的醫(yī)療器械案。長沙L9000冷光源更換燈泡</p><p> 開關(guān)電源中的頻率抖動在展會上，一工程師介紹了一芯片中集成了這種功能，一時之間到不算太理解這項技術(shù)的意義，然后找了一些資料，然后找到兩個分析電路進(jìn)行大致介紹。我們知道在固定頻率PWM控制器中，窄帶發(fā)射通常發(fā)生在開關(guān)頻率，其連續(xù)諧波的能量會越來越低。采用頻率抖動技術(shù)(FrequencyJitter)的著眼點在于分散諧波干擾能量，我們使得開關(guān)電源的工作頻率并非固定不變，而是周期性地變化，由于EMI發(fā)射分布在較廣的頻率范圍而不是在窄帶頻率下工作，因此可降低EMI發(fā)射的峰值。抖動振蕩器也將降低諧波頻率(即為開關(guān)頻率倍數(shù)的頻率)的峰值。發(fā)射量的減少取決于調(diào)制頻率的選擇(抖動率)、抖動帶寬以及接受的分辨帶寬。注意：當(dāng)然對降低高頻非諧波發(fā)射起到的作用微乎其微。這些發(fā)射是由于寄生LC電路、二極管反向恢復(fù)電流等在交換節(jié)點的振鈴導(dǎo)致的。添加緩沖器、柵極驅(qū)動電阻器或使用軟恢復(fù)二極管是降低這些發(fā)射的常見的解決方法。缺點：抖動振蕩器將給輸出電壓添加少量紋波（紋波的頻率等于抖動頻率），通常遠(yuǎn)小于由于電容ESR和電感電流產(chǎn)生的輸出電壓紋波的頻率(開關(guān)頻率)，抖動產(chǎn)生的輸出紋波的幅度與額定輸出紋波的幅度相比相對較低。長沙L9000冷光源更換燈泡</p><p style="text-indent:25px">成都鐳伙科技有限公司位于新都區(qū)踏水路創(chuàng)想大廈2單元2606。公司業(yè)務(wù)分為內(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(jī)及攝像頭維修，手術(shù)器械類維修等，目前不斷進(jìn)行創(chuàng)新和服務(wù)改進(jìn)，為客戶提供良好的產(chǎn)品和服務(wù)。公司秉持誠信為本的經(jīng)營理念，在儀器儀表深耕多年，以技術(shù)為先導(dǎo)，以自主產(chǎn)品為重點，發(fā)揮人才優(yōu)勢，打造儀器儀表良好品牌。在社會各界的鼎力支持下，持續(xù)創(chuàng)新，不斷鑄造***服務(wù)體驗，為客戶成功提供堅實有力的支持。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2844182.html</p></div></div></div></div></div><div id="dhzwtls" class="page-right twoColRt"><div id="t3ogn83" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="cwdq8hz" 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(qiáng) 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(qiáng) 信息推薦自業(yè)物資供應(yīng)</p></a></div><div 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