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class="container clearfix tcPro"><section class="home-main container clearfix"><div id="ywdpbnu" class="twoCol"><div id="fcjq3q7" class="page-proshow clearfix"><p class="current"> 當(dāng)前位置:<a href="http://www.cdcfah.com/">首頁(yè)?<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>?長(zhǎng)沙史賽克L10冷光源主機(jī)芯片級(jí)維修誠(chéng)信為本成都鐳伙醫(yī)修平臺(tái)供應(yīng)</p><div id="3vv8lsz" class="leftbox clearfix"><h1>長(zhǎng)沙史賽克L10冷光源主機(jī)芯片級(jí)維修誠(chéng)信為本成都鐳伙醫(yī)修平臺(tái)供應(yīng)</h1><div id="p2bizl2" class="proBig"><div id="m9tfmy9" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/leihuo/637397544556686464/4081870.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="3g2v3ba" 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相比于電源的其他損耗，這些損耗一般較小，但是可以作些分析看看是否有改進(jìn)的可能。首先是啟動(dòng)電路。啟動(dòng)電路從輸入電壓獲得直流電流，使控制IC和驅(qū)動(dòng)電路有足夠的能量啟動(dòng)電源。如果這個(gè)啟動(dòng)電路不能在電源啟動(dòng)后切斷電流，那么電路會(huì)有高達(dá)3W的持續(xù)的損耗，損耗大小取決于輸入電壓。第二個(gè)主要方面是功率開(kāi)關(guān)驅(qū)動(dòng)電路。如果功率開(kāi)關(guān)用雙極型功率晶體管，則基極驅(qū)動(dòng)電流必須大于晶體管集電極e峰值電流除以增益(hFE)。功率晶體管的典型增益在5-15之間，這意味著如果是10A的峰值電流，就要求～2A的基極電流?；錁O之間有，如果基極電流不是從非常接近，則會(huì)產(chǎn)生很大的損耗。功率MOSFET驅(qū)動(dòng)效率比雙極型功率晶體管高。MOSFET柵極有兩個(gè)與漏源極相連的等效電容，即柵源電容Ciss和漏源電容Crss。MOSFET柵極驅(qū)動(dòng)的損耗來(lái)自于開(kāi)通MOSFET時(shí)輔助電壓對(duì)柵極電容的充電，關(guān)斷MOSFET時(shí)又對(duì)地放電。柵極驅(qū)動(dòng)損耗計(jì)算由式(5)給出。對(duì)這個(gè)損耗，除了選擇Ciss和Crss值較低的MOSFET，從而有可能略微降低大柵極驅(qū)動(dòng)電壓以外，沒(méi)有太多的辦法。與磁性元件有關(guān)的損耗對(duì)一般設(shè)計(jì)工程師而言，長(zhǎng)沙史賽克L10冷光源主機(jī)芯片級(jí)維修，這部分非常復(fù)雜，長(zhǎng)沙史賽克L10冷光源主機(jī)芯片級(jí)維修。因?yàn)榇判栽g(shù)語(yǔ)的特殊性，以下所述的損耗主要由磁心生產(chǎn)廠家以圖表的形式表示，長(zhǎng)沙史賽克L10冷光源主機(jī)芯片級(jí)維修。一般位于儀器的下部或背側(cè)，如果日常工作中不注重電源部分的保養(yǎng)清潔維護(hù)。長(zhǎng)沙史賽克L10冷光源主機(jī)芯片級(jí)維修</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="長(zhǎng)沙史賽克L10冷光源主機(jī)芯片級(jí)維修,L10" src="https://tyunfile.71360.com/WaterMark/UploadFile/leihuo/637397544556686464/4081870.png"></div><p> 假設(shè)有電源Vu通過(guò)電阻R給電容C充電，V0為電容上的初始電壓值，Vu為電容充滿電后的電壓值，Vt為任意時(shí)刻t時(shí)電容上的電壓值，那么便可以得到如下的計(jì)算公式：Vt=V0+(Vu–V0)*[1–exp(-t/RC)]如果電容上的初始電壓為0，則公式可以簡(jiǎn)化為：Vt=Vu*[1–exp(-t/RC)]由上述公式可知，因?yàn)橹笖?shù)值只可能無(wú)限接近于0，但永遠(yuǎn)不會(huì)等于0，所以電容電量要完全充滿，需要無(wú)窮大的時(shí)間。當(dāng)t=RC時(shí)，Vt=；當(dāng)t=2RC時(shí)，Vt=；當(dāng)t=3RC時(shí)，Vt=；當(dāng)t=4RC時(shí)，Vt=；當(dāng)t=5RC時(shí)，Vt=；可見(jiàn)，經(jīng)過(guò)3~5個(gè)RC后，充電過(guò)程基本結(jié)束。當(dāng)電容充滿電后，將電源Vu短路，電容C會(huì)通過(guò)R放電，則任意時(shí)刻t，電容上的電壓為：Vt=Vu*exp(-t/RC)對(duì)于簡(jiǎn)單的串聯(lián)電路，時(shí)間常數(shù)就等于電阻R和電容C的乘積，但是，在實(shí)際電路中，時(shí)間常數(shù)RC并不那么容易算，例如下圖(a)。對(duì)于上圖(a)，如果從充電的角度去計(jì)算時(shí)間常數(shù)會(huì)比較難，我們不妨換個(gè)角度來(lái)思考，我們知道，時(shí)間常數(shù)只與電阻和電容有關(guān)，而與電源無(wú)關(guān)，對(duì)于簡(jiǎn)單的由一個(gè)電阻R和一個(gè)電容C串聯(lián)的電路來(lái)說(shuō)，其充電和放電的時(shí)間參數(shù)是一樣的，都是RC，所以，我們可以把上圖中的電源短路，使電容C1放電，如上圖(b)所示，很容易得到其時(shí)間常數(shù)：t=RC=。長(zhǎng)沙史賽克L10冷光源主機(jī)芯片級(jí)維修器械科維修工作人員的待遇曾遠(yuǎn)低于**人員，工作業(yè)績(jī)得不到認(rèn)可。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="長(zhǎng)沙史賽克L10冷光源主機(jī)芯片級(jí)維修,L10" src="https://tyunfile.71360.com/WaterMark/UploadFile/leihuo/637397544558737409/2747312.png"></div><p> 但是銅帶使用時(shí)會(huì)出現(xiàn)較明顯的繞組邊緣效應(yīng)，電流變成了不均勻分布的形式，可以想象二維場(chǎng)效應(yīng)是比較嚴(yán)重的。在分析銅帶繞組的二維邊緣效應(yīng)之前，先做一定的假設(shè):①假定電流集中在一個(gè)趨膚深度內(nèi)。當(dāng)銅帶導(dǎo)體的厚度是當(dāng)前工作頻率對(duì)應(yīng)的趨膚深度的若干倍時(shí)，這一點(diǎn)是成立的。②假定電流密度沿著銅帶導(dǎo)體表面是Js，則銅帶厚度方向上電流密度的分布滿足式():n表示銅帶從表面深入到內(nèi)部的深度，k為結(jié)構(gòu)系數(shù)。在高頻的情況下，趨膚深度非常小，導(dǎo)體表面的磁場(chǎng)接近線性磁場(chǎng)，這種情況下，導(dǎo)體表面的電流分布類似于在標(biāo)量電勢(shì)作用下的導(dǎo)體表面的靜電荷分布，方形銅帶問(wèn)題的分析就可以簡(jiǎn)化為與之等截面積的橢圓狀銅帶導(dǎo)體的分析，方形銅帶導(dǎo)體和橢圓形銅帶導(dǎo)體的截面關(guān)系如圖。圖使用這種假設(shè)條件，則可以得到沿著銅帶的電流密度分布為式()所示：由式()可以看出，當(dāng)x=b或者x＝-b時(shí)電流密度Js大。即銅帶在導(dǎo)體的邊緣處達(dá)到大值，從磁場(chǎng)分布的角度來(lái)看，在銅帶導(dǎo)體的邊緣處由于邊緣效應(yīng)，磁場(chǎng)垂直于導(dǎo)體的分量會(huì)很大，這樣就導(dǎo)致了這個(gè)磁場(chǎng)分量對(duì)銅帶導(dǎo)體的切割，銅帶繞組的渦流損耗會(huì)增大，同時(shí)導(dǎo)體邊緣處的強(qiáng)磁場(chǎng)會(huì)導(dǎo)致電流密度的明顯增大。電流分布是在邊緣處很強(qiáng)，中間較為平均。</p><p> 1-182)式就是全橋式變壓器開(kāi)關(guān)電源正激輸出時(shí)的電壓關(guān)系式。上式中，(Up)為開(kāi)關(guān)變壓器次級(jí)線圈N2繞組正激輸出電壓的幅值；Ui為開(kāi)關(guān)電源變壓器初級(jí)線圈N1繞組的輸入電壓；n為變壓器次、初級(jí)線圈的變壓比，即：開(kāi)關(guān)變壓器次級(jí)線圈輸出電壓與初級(jí)線圈輸入電壓之比，n也可以看成是開(kāi)關(guān)變壓器次級(jí)線圈N2繞組與初級(jí)線圈N1繞組的匝數(shù)比，即：n=N2/N1。由此可知，在控制開(kāi)關(guān)K1和K4接通期間，全橋式變壓器開(kāi)關(guān)電源變壓器次級(jí)輸出的正激電壓幅值只與輸入電壓和變壓器的次/初級(jí)變壓比有關(guān)系。同理我們也可以求得，當(dāng)控制開(kāi)關(guān)K2和K3接通時(shí)，開(kāi)關(guān)變壓器N2線圈繞組輸出的正激電壓幅值(Up-)為：(Up-)=－e2=－ne1=－nUiK2和K3接通期間(1-183)上式中的負(fù)號(hào)表示e2的符號(hào)與(1-182)中的符號(hào)相反，(Up-)表示與(Up)的極性相反，因?yàn)閁ab=－Uba。這里還需指出，(1-182)式和(1-183)式列出的計(jì)算結(jié)果，并沒(méi)有考慮控制開(kāi)關(guān)K1和K4或K2和K3關(guān)斷瞬間，勵(lì)磁電流存儲(chǔ)的能量產(chǎn)生反電動(dòng)勢(shì)的影響。當(dāng)控制開(kāi)關(guān)K1和K4或K2和K3關(guān)斷瞬間，流過(guò)開(kāi)關(guān)變壓器初級(jí)線圈的勵(lì)磁電流由最大值突然下降為零，使開(kāi)關(guān)變壓器鐵心中的磁通量也要跟著產(chǎn)生變化；即：開(kāi)關(guān)變壓器的初、次級(jí)線圈中都會(huì)產(chǎn)生感應(yīng)電動(dòng)勢(shì)。醫(yī)療設(shè)備維修工作的方式發(fā)生了轉(zhuǎn)變，主要以聯(lián)系外協(xié)廠家修理為主，醫(yī)院設(shè)備科工程師修理為輔。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="長(zhǎng)沙史賽克L10冷光源主機(jī)芯片級(jí)維修,L10" src="https://tyunfile.71360.com/UploadFile/leihuo/637397544556686464/4081870.png"></div><p> 分析輸出整流器的開(kāi)關(guān)損耗則要復(fù)雜得多。整流器自身固有的特性在局部電路內(nèi)會(huì)引發(fā)很多問(wèn)題。開(kāi)通期間，過(guò)渡過(guò)程是由整流管的正向恢復(fù)特性決定的。正向恢復(fù)時(shí)間tfrr是二極管兩端加上正向電壓到開(kāi)始流過(guò)正向電流時(shí)所用的時(shí)間。對(duì)于PN型快恢復(fù)二極管而言，這個(gè)時(shí)間是5～15ns。肖特基二極管由于自身固有的更高的結(jié)電容，因此有時(shí)會(huì)表現(xiàn)出更長(zhǎng)的正向恢復(fù)時(shí)間特性。盡管這個(gè)損耗不是很大，但它能在電源內(nèi)部引起其他的問(wèn)題。正向恢復(fù)期間，電感和變壓器沒(méi)有很大的負(fù)載阻抗，而功率開(kāi)關(guān)或整流器仍處于關(guān)斷狀態(tài)，這使得儲(chǔ)存的能量產(chǎn)生振蕩，直至整流器終開(kāi)始流過(guò)正向電流并鉗位功率信號(hào)。關(guān)斷瞬間，反向恢復(fù)特性起主要作用。當(dāng)反向電壓加在二極管兩端時(shí)，PN二極管的反向恢復(fù)特性由結(jié)內(nèi)的載流子決定，這些遷移率受限的載流子需要從原來(lái)進(jìn)入結(jié)內(nèi)的反方向出去，從而構(gòu)成了流過(guò)二極管的反向電流。與此相關(guān)的損耗可能會(huì)很大，因?yàn)樵诮Y(jié)區(qū)電荷被耗盡前，反向電壓會(huì)迅速上升得很高，反向電流通過(guò)變壓器反射到一次側(cè)功率開(kāi)關(guān)，增加了功率管的損耗。以圖1為例，可以看到開(kāi)通期間的電流峰值。類似的反向恢復(fù)特性也會(huì)出現(xiàn)在高電壓肖特基整流器中，這一特性不是由載流子引起的。醫(yī)療設(shè)備使用科室重使用，輕維護(hù)。長(zhǎng)沙史賽克L10冷光源主機(jī)芯片級(jí)維修</p><p style="text-indent:25px">醫(yī)院醫(yī)工人員構(gòu)成復(fù)雜，學(xué)歷、專業(yè)、基本素質(zhì)參差不齊、人員數(shù)量較少。長(zhǎng)沙史賽克L10冷光源主機(jī)芯片級(jí)維修</p><p style="text-indent:25px">儀器儀表是用以檢出、測(cè)量、觀察、計(jì)算各種物理量、物質(zhì)成分、物性參數(shù)等的器具或設(shè)備。真空檢漏儀、壓力表、測(cè)長(zhǎng)儀、顯微鏡、乘法器等均屬于儀器儀表。近年來(lái)，得益于機(jī)械、冶金、石化行業(yè)等儀器儀表服務(wù)領(lǐng)域經(jīng)營(yíng)狀況的好轉(zhuǎn)，我國(guó)儀器儀表制造業(yè)發(fā)展一路向好。中國(guó)的新型工業(yè)化進(jìn)程，信息化和工業(yè)化融合的進(jìn)一步加深，帶動(dòng)各個(gè)工業(yè)領(lǐng)域?qū)τ趦?nèi)窺鏡以及維修周邊，動(dòng)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)器械類維修等產(chǎn)品的需求。電子技術(shù)研究開(kāi)發(fā)及轉(zhuǎn)讓、電氣設(shè)備、醫(yī)療設(shè)備維護(hù)服務(wù)、機(jī)械設(shè)備的設(shè)計(jì)、銷售；電器用品、醫(yī)療器械；貨物及技術(shù)進(jìn)出口。專業(yè)維修直管硬鏡、攝像系統(tǒng)、冷光源、氣腹機(jī)、動(dòng)力系統(tǒng)、灌注泵、動(dòng)力系統(tǒng)手柄、超聲刀手柄。軟質(zhì)器械激光焊接。產(chǎn)品普遍運(yùn)用于工業(yè)、農(nóng)業(yè)、交通、科技、環(huán)保、**、文教衛(wèi)生、大家生活等各個(gè)領(lǐng)域，在旺盛市場(chǎng)需求的帶動(dòng)下和我國(guó)宏觀調(diào)控政策的引導(dǎo)下，我國(guó)儀器儀表行業(yè)的發(fā)展有了長(zhǎng)足的進(jìn)步空間。從銷售廣義角度來(lái)說(shuō)，儀器儀表也可具有自動(dòng)操控、報(bào)警、信號(hào)傳遞和數(shù)據(jù)處理等功能，例如用于工業(yè)生產(chǎn)過(guò)程自動(dòng)操控中的氣動(dòng)調(diào)節(jié)儀表，和電動(dòng)調(diào)節(jié)儀表，以及集散型儀表操控系統(tǒng)也皆屬于儀器儀表。長(zhǎng)沙史賽克L10冷光源主機(jī)芯片級(jí)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。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(dòng)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，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(qiáng)企業(yè)重點(diǎn)競(jìng)爭(zhēng)力，努力學(xué)習(xí)行業(yè)知識(shí)，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(chǎn)品、專業(yè)的服務(wù)、眾多的成功案例積累起來(lái)的聲譽(yù)和口碑，讓企業(yè)發(fā)展再上新高。</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/2861037.html</p></div></div></div></div></div><div id="6k7uofw" class="page-right twoColRt"><div id="jqmeamo" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="du3tamd" 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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