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#f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>湖南STRYKER史賽克L10光源主機芯片級維修,L10</p><p><span>***更新：</span>2021-01-31 01:12:40</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="kh3kamc" 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="ecdu7pp" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="f8kfw3z" class="box"><p><p> 半橋式變壓器開關(guān)電源大的優(yōu)點是，對兩個開關(guān)器件的耐壓要求比推挽式變壓器開關(guān)電源對兩個開關(guān)器件的耐壓要求可以降低一半。因為，半橋式變壓器開關(guān)電源兩個開關(guān)器件的工作電壓只有輸入電源Ui的一半，其高耐壓等于工作電壓與反電動勢之和，大約是電源電壓的兩倍，這個結(jié)果正好是推挽式變壓器開關(guān)電源兩個開關(guān)器件耐壓的一半。因此，半橋式變壓器開關(guān)電源主要用于輸入電壓比較高的場合，一般電網(wǎng)電壓為交流220伏供電的大功率開關(guān)電源大部分都是用半橋式變壓器開關(guān)電源。半橋式開關(guān)電源的變壓器初級線圈只需要一個繞組，這也是它的優(yōu)點，這對小功率開關(guān)電源變壓器的線圈繞制多少帶來一些方便。但對于大功率開關(guān)電源變壓器的線圈繞制沒有優(yōu)勢，因為，大功率開關(guān)電源變壓器的線圈需要用多股線來繞制。半橋式變壓器開關(guān)電源的缺點主要是電源利用率比較低，因此，半橋式變壓器開關(guān)電源不適宜用于工作電壓較低的場合，湖南STRYKER史賽克L10光源主機芯片級維修。另外，半橋式變壓器開關(guān)電源中的兩個開關(guān)器件連接沒有公共地，湖南STRYKER史賽克L10光源主機芯片級維修，與驅(qū)動信號連接比較麻煩。半橋式開關(guān)電源大的缺點是，當(dāng)兩個控制開關(guān)K1和K2處于交替轉(zhuǎn)換工作狀態(tài)的時候，湖南STRYKER史賽克L10光源主機芯片級維修，兩個開關(guān)器件會同時出現(xiàn)一個很短時間的半導(dǎo)通區(qū)域，即兩個控制開關(guān)同時處于接通狀態(tài)。維修配件**化而不能通用，并且不提供維修配件；湖南STRYKER史賽克L10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="湖南STRYKER史賽克L10光源主機芯片級維修,L10" src="https://tyunfile.71360.com/UploadFile/leihuo/637397544557558229/8947445.png"></div><p> 這種關(guān)系如圖6所示。一篇名為“如何將功率MOSFET的RDS(on)對漏極電流瞬態(tài)值的依賴性包含到高頻三相PWM逆變器的傳導(dǎo)損耗計算中”的IEEE文章描述了如何確定漏極電流對傳導(dǎo)損耗的影響。作為ID之函數(shù)，RDS(on)變化對大多數(shù)SMPS拓?fù)涞挠绊懞苄　＠?，在PFC電路中，當(dāng)FCP11N60MOSFET的峰值電流ID為11A兩倍于(規(guī)格書中RDS(on)的測試條件)時，RDS(on)的有效值和傳導(dǎo)損耗會增加5％。在MOSFET傳導(dǎo)極小占空比的高脈沖電流拓?fù)浣Y(jié)構(gòu)中，應(yīng)該考慮圖6所示的特性。如果FCP11N60MOSFET工作在一個電路中，其漏極電流為占空比(即RMS)，則有效的RDS(on)將比（規(guī)格書中的測試電流）時的。公式2CCMPFC電路中的RMS電流式2中，Iacrms是PFC電路RMS輸入電流；Vac是PFC電路RMS輸入電壓；Vout是直流輸出電壓。在實際應(yīng)用中，計算IGBT在類似PFC電路中的傳導(dǎo)損耗將更加復(fù)雜，因為每個開關(guān)周期都在不同的IC上進(jìn)行。IGBT的VCE(sat)不能由一個阻抗表示，比較簡單直接的方法是將其表示為阻抗RFCE串聯(lián)一個固定VFCE電壓，VCE(ICE)=ICE×RFCE+VFCE。于是，傳導(dǎo)損耗便可以計算為平均集電極電流與VFCE的乘積，加上RMS集電極電流的平方，再乘以阻抗RFCE。圖5中的示例*考慮了CCMPFC電路的傳導(dǎo)損耗。湖南STRYKER史賽克L10光源主機芯片級維修而現(xiàn)在的各大廠商，根本不可能進(jìn)行元件級維修，并且基本不進(jìn)行板件級維修。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="湖南STRYKER史賽克L10光源主機芯片級維修,L10" src="https://tyunfile.71360.com/UploadFile/leihuo/637397544554157120/3771438.png"></div><p> 為了有效地利用導(dǎo)體材料和便于散熱，發(fā)電廠的大電流母線常做成槽形或菱形母線；另外，在高壓輸配電線路中，利用鋼芯鋁絞線代替鋁絞線，這樣既節(jié)省了鋁導(dǎo)線，又增加了導(dǎo)線的機械強度，這些都是利用了集膚效應(yīng)這個原理。集膚效應(yīng)是在訊號線里基本的失真作用過程之一，也有可能是容意被忽略誤解的。與一般訊號線的夸大宣傳所言,集膚效應(yīng)并不會改變所有的高頻訊號,并且不會造成任何相關(guān)動能的損失。正好相反，集膚效應(yīng)會因傳導(dǎo)體的不同成分，在傳遞高頻訊號時有不連貫的現(xiàn)象。同樣地，在陳舊的線束傳導(dǎo)體上，集膚效應(yīng)助長訊號電流在多條線束上的交互跳動，對于聲音造成刺耳的記號。2.鄰近效應(yīng)圖。A、B兩導(dǎo)體流過相同方向的電流IA和IB，當(dāng)電流按圖中箭頭方向突增時，導(dǎo)體A產(chǎn)生的突變磁通ΦA(chǔ)-B在導(dǎo)體B中產(chǎn)生渦流，使其下表面的電流增大，上表面的電流減少。同樣導(dǎo)體B產(chǎn)生的突變磁通ΦB-A在導(dǎo)體A中產(chǎn)生渦流，使其上表面的電流增大，下表面的電流減少。這個現(xiàn)象就是導(dǎo)體之間的鄰近效應(yīng)。當(dāng)流過導(dǎo)體的電流相同，導(dǎo)體之間的距離一定時，如果導(dǎo)體之間的相對面積不同，鄰近效應(yīng)使得導(dǎo)體有效截面面積不同。研究表明:導(dǎo)體的相對面積越大則導(dǎo)體有效截面越大，損耗相對較小。</p><p> 這種感應(yīng)電動勢是勵磁電流存儲于關(guān)變壓器鐵心中的磁能量產(chǎn)生的；這種感應(yīng)電動勢對于變壓器次級線圈電壓輸出繞組來說，屬于反激式輸出。即：全橋式變壓器開關(guān)電源同時存在正、反激電壓輸出。反激式電壓產(chǎn)生的原因是因為K1和K4或K2和K3接通瞬間變壓器初級或次級線圈中的電流初始值不等于零，或磁通的初始值不等于零。實際上，全橋式變壓器開關(guān)電源的反激式輸出電壓部分是不能忽略的。全橋式變壓器開關(guān)電源變壓器次級線圈的輸出電壓應(yīng)該同時包括兩部分，正激輸出電壓和反激輸出電壓。因此，圖1-47中，當(dāng)控制開關(guān)K1和K4關(guān)斷，K2和K3接通瞬間，開關(guān)變壓器次級線圈輸出電壓應(yīng)該等于正激電壓與反激電壓之和。正激電壓的計算可由(1-182)式和(1-183)式給出，反激電壓的計算可由(1-67)或(1-68)式給出。關(guān)于純電阻負(fù)載反激式輸出電壓的計算，請參考前面《1-5-1．單激式變壓器開關(guān)電源的工作原理》章節(jié)中的相關(guān)內(nèi)容分析，這里不再贅述。根據(jù)(1-67)式上式中，[uo]表示開關(guān)變壓器次級線圈N2繞組輸出的反激式電壓，[i2]表示開關(guān)變壓器次級線圈N2繞組輸出反激式電壓對負(fù)載R產(chǎn)生的電流。另外根據(jù)(1-183)式求得的結(jié)果，開關(guān)變壓器次級線圈N2繞組產(chǎn)生的正激式輸出電壓為：。在當(dāng)今醫(yī)療設(shè)備的維修工作中，存在著兩種不合理現(xiàn)象：一種是技術(shù)的價值不被承認(rèn)和認(rèn)識。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="湖南STRYKER史賽克L10光源主機芯片級維修,L10" src="https://tyunfile.71360.com/WaterMark/UploadFile/leihuo/637397544558737409/2747312.png"></div><p> 全橋式變壓器開關(guān)電源工作原理與推挽式變壓器開關(guān)電源以及半橋式變壓器開關(guān)電源的工作原理是很相似的，因此，分析方法也基本相同。下面我們進(jìn)一步詳細(xì)分析全橋式變壓器開關(guān)電源的工作原理。當(dāng)控制開關(guān)K1和K4接通時候，電源電壓Ui被加到變壓器初級線圈N1繞組的a、b兩端，在變壓器初級線圈N1繞組中將有電流經(jīng)過，通過電磁感應(yīng)會在變壓器的鐵心中產(chǎn)生磁場，并產(chǎn)生磁力線；同時，在初級線圈N1繞組的兩端要產(chǎn)生自感電動勢e1，在次級線圈N2繞組的兩端也會產(chǎn)生感應(yīng)電動勢e2；感應(yīng)電動勢e2作用于負(fù)載R的兩端，從而產(chǎn)生負(fù)載電流。因此，在初、次級電流的共同作用下，在變壓器的鐵心中會產(chǎn)生一個由流過變壓器初、次級線圈電流產(chǎn)生的合成磁場，這個磁場的大小可用磁力線通量(簡稱磁通量)，即磁力線的數(shù)目Φ來表示。如果用Φ1來表示變壓器初級線圈N1繞組電流產(chǎn)生的磁通量，用Φ2來表示變壓器次級線圈電流產(chǎn)生的磁通量，由于變壓器初、次級線圈電流產(chǎn)生的磁場方向總是相反，則在控制開關(guān)K1和K4接通期間，由流過變壓器初、次級線圈電流在變壓器鐵心中產(chǎn)生的合成磁場的總磁通量Φ為：Φ=Φ1－Φ2K1和K4接通期間(1-179)其中變壓器初級線圈電流產(chǎn)生的磁通Φ1還可以分成兩個部分。采用分割電路追蹤信號來分析故障的方法，也是基本的維修技術(shù)之一。湖南STRYKER史賽克L10光源主機芯片級維修</p><p style="text-indent:25px">此法是指用性能正常的元器件或IC板替換有疑問的，以幫助確定故障來源的方法此法常用于確定板級故障。湖南STRYKER史賽克L10光源主機芯片級維修</p><p> 當(dāng)?shù)刃У亩鄶?shù)載流子MOSFET關(guān)斷時，在IGBT少數(shù)載流子BJT中仍存在存儲時間延遲td(off)I。不過，降低Eoff驅(qū)動阻抗將會減少米勒電容(Millercapacitance)CRES和關(guān)斷VCE的dv/dt造成的電流注到柵極驅(qū)動回路中的風(fēng)險，避免使器件重新偏置為傳導(dǎo)狀態(tài)，從而導(dǎo)致多個產(chǎn)生Eoff的開關(guān)動作。ZVS和ZCS拓?fù)湓诮档蚆OSFET和IGBT的關(guān)斷損耗方面很有優(yōu)勢。不過ZVS的工作優(yōu)點在IGBT中沒有那么大，因為當(dāng)集電極電壓上升到允許多余存儲電荷進(jìn)行耗散的電勢值時，會引發(fā)拖尾沖擊電流Eoff。ZCS拓?fù)淇梢蕴嵘蟮腎GBTEoff性能。正確的柵極驅(qū)動順序可使IGBT柵極信號在第二個集電極電流過零點以前不被清理，從而明顯降低IGBTZCSEoff。MOSFET的Eoff能耗是其米勒電容Crss、柵極驅(qū)動速度、柵極驅(qū)動關(guān)斷源阻抗及源極功率電路路徑中寄生電感的函數(shù)。該電路寄生電感Lx(如圖8所示)產(chǎn)生一個電勢，通過限制電流速度下降而增加關(guān)斷損耗。在關(guān)斷時，電流下降速度di/dt由Lx和VGS(th)決定。如果Lx=5nH，VGS(th)=4V，則大電流下降速度為VGS（th）/Lx=800A/μs?？偨Y(jié)：在選用功率開關(guān)器件時，并沒有萬全的解決方案，電路拓?fù)?、工作頻率、環(huán)境溫度和物理尺寸，所有這些約束都會在做出佳選擇時起著作用。湖南STRYKER史賽克L10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主要經(jīng)營范圍是儀器儀表，擁有一支專業(yè)技術(shù)團(tuán)隊和良好的市場口碑。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 /><p>文章來源地址: http://www.cdcfah.com/cp/3084580.html</p></div></div></div></div></div><div id="e8qh7gs" class="page-right twoColRt"><div id="mqlxefw" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="clxof3z" 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 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