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onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="rq3vhg2" 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>上海市</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關鍵詞：</span>松江區(qū)大功率電源模塊廠電話,大功率電源模塊</p><p><span>***更新：</span>2021-02-06 04:26:13</p><p><span id="click" >瀏覽次數(shù)：4次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="8ngsp9j" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">上海多商電子有限公司</a></p><p><span>聯(lián)系人：</span>吳加斌</p><p><span>郵箱: </span>wu867@126.com</p><p><span>電話: </span>18121221687</p><p><span>傳真: </span>021_69585559</p><p><span>網(wǎng)址: </span>http://www.10000kw.com</p><p><span>手機: </span>021-69585559</p><p><span>地址: </span>上海市嘉定區(qū)科福路358號4號樓4樓</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="zj4sutp" class="page-proshow02"><p class="title">詳細說明</p><div id="dnxe7a8" class="box"><p><p style="text-indent:25px">大功率電源模塊常見的低溫和高溫不良的現(xiàn)象有：工作振蕩，輸出電壓紋波和噪聲變大，頻率發(fā)生改變，嚴重的甚至輸出電壓跳變，模塊嘯叫。啟動不良，如啟動時輸出電壓升上波形有明顯掉溝，輸出電壓不穩(wěn)定，甚至模塊完全啟動失效。帶容性負載能力減弱，無法帶較大容性負載啟動。啟動時輸出電壓過沖幅度變大，松江區(qū)大功率電源模塊廠電話，超出規(guī)定范圍，松江區(qū)大功率電源模塊廠電話。重載或滿載工作時輸出電壓明顯降低。高溫老化損壞，模塊沒有輸出。所以，可靠性高的大功率電源模塊必須保證在高低溫等極端條件下工作正常，滿足性能參數(shù)要求，松江區(qū)大功率電源模塊廠電話。因通信容量的不斷增加,通信電源容量也將不斷增加。松江區(qū)大功率電源模塊廠電話</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="松江區(qū)大功率電源模塊廠電話,大功率電源模塊" src="https://tyunfile.71360.com/UploadFile/shdsdz/637393060363069764/9500531.png"></div><p style="text-indent:25px"> 開關電源的選用：開關電源在輸入抗干擾性能上，由于其自身電路結構的特點（多級串聯(lián)），一般的輸入干擾如浪涌電壓很難通過，在輸出電壓穩(wěn)定度這一技術指標上與線性電源相比具有較大的優(yōu)勢，其輸出電壓穩(wěn)定度可達(0.5～1）%。開關電源模塊作為一種電力電子集成器件，在選用中應注意以下幾點：因開關電源工作效率高，一般可達到80%以上，故在其輸出電流的選擇上，應準確測量或計算用電設備的較大吸收電流，以使被選用的開關電源具有高的性能價格比，通常輸出計算公式為： Is=KIf 式中：Is—開關電源的額定輸出電流； If—用電設備的較大吸收電流； K—裕量系數(shù)，一般取1.5～1.8；山東大功率電源模塊公司有哪些不同的供應商可以按照現(xiàn)有的技術標準設計同一大小的大功率電源模塊。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="松江區(qū)大功率電源模塊廠電話,大功率電源模塊" src="https://tyunfile.71360.com/UploadFile/shdsdz/637393060763231217/4135973.png"></div><p style="text-indent:25px">通信業(yè)的迅速發(fā)展極大的推動了通信電源的發(fā)展。高頻小型化的開關電源及其技術已成為現(xiàn)代通信供電系統(tǒng)的主流。在通信領域中,通常將整流器稱為一次電源,而將直流-直流(DC/DC)變換器稱為二次電源。一次電源的作用是將單相或三相交流電網(wǎng)變換成標稱值為48V的直流電源。當前在程控交換機用的一次電源中,傳統(tǒng)的相控式穩(wěn)壓電源己被高頻開關電源取代,高頻開關電源(也稱為開關型整流器SMR)通過MOSFET或IGBT的高頻工作,開關頻率一般控制在50-100kHz范圍內(nèi),實現(xiàn)高效率和小型化。近幾年,開關整流器的功率容量不斷擴大,單機容量己從48V/12.5A、48V/20A擴大到48V/200A、48V/400A。</p><p style="text-indent:25px">大功率電源模塊在電壓轉換過程中有能量損耗，產(chǎn)生熱能導致模塊發(fā)熱，降低電源的轉換效率，影響電源模塊正常工作，但什么情況下會造成大功率電源模塊發(fā)熱較嚴重呢？負載過流，超出數(shù)據(jù)手冊應用范圍使得內(nèi)部關鍵器件溫度飆升；環(huán)境溫度過高或散熱不良；其他大發(fā)熱源熱傳遞。使用線性電源時要加散熱片,或選擇效率高的開關電源；輸出功率更大的模塊，確保有70%~80%的負載降額；降低環(huán)境溫度，保持散熱良好。噪聲是衡量電源模塊優(yōu)劣的一大關鍵指標，在應用電路中，模塊周邊元器件的設計布局等也會影響輸出噪聲，哪些因素對輸出噪聲有較大影響呢？電源模塊與主電路噪聲敏感元件距離過近；主電路噪聲敏感元件的電源輸入端處未接去耦電容；多路系統(tǒng)中各單路輸出的電源模塊之間產(chǎn)生差頻干擾；地線處理不合理；電源模塊輸入端的噪聲過大，未處理，直接耦合到電源模塊輸出端；保護電路的技術參數(shù)應與用電設備的工作特性相匹配，以避免損壞用電設備或開關電源。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="松江區(qū)大功率電源模塊廠電話,大功率電源模塊" src="https://tyunfile.71360.com/UploadFile/shdsdz/637393060608619787/3503048.png"></div><p style="text-indent:25px">一般在不同的使用領域，對大功率電源模塊的工作溫度范圍要求各異：高低溫測試是用來確定產(chǎn)品在低溫、高溫兩個極端氣候環(huán)境條件下的適應性和一致性，檢查設計余量是否足夠。因為元器件的特性在低溫、高溫的條件下會發(fā)生一定的變化，性能參數(shù)具有溫度漂移特性。所以往往很多電源模塊在常溫測試通過，一旦拿到高低溫環(huán)境測試就發(fā)現(xiàn)工作不正?；蛘咝阅軈?shù)明顯下降。同時通過長時間高溫老化可以使元器件的缺陷、焊接和裝配等生產(chǎn)過程中存在的隱患提前暴露出來。對于大功率電源模塊的應力設計，重點關注場效應管(MOS管)、二極管、變壓器、功率電感、電解電容、限流電阻等。保證全電壓范圍內(nèi)在穩(wěn)態(tài)、瞬態(tài)、短路等各種極限條件下都能有足夠的降額，以保障產(chǎn)品的可靠性。開關電源模塊作為一種電力電子集成器件，在選用中應注意幾點。松江區(qū)大功率電源模塊廠電話</p><p style="text-indent:25px">一般來說，這類模塊稱為負載點電源供應系統(tǒng)或使用點電源供應系統(tǒng) 。松江區(qū)大功率電源模塊廠電話</p><p style="text-indent:25px">確定電源的規(guī)格，根據(jù)實際需求的指標進行篩選，確定使用標準大功率電源模塊還是非標，非標電源可按需求定制生產(chǎn)。先確認輸入電壓的較小值和較大值，再根據(jù)確定的輸入電壓選擇不同范圍的模塊；變壓整流輸出以及各式電瓶、蓄電池、鋰電池、干電池、遠距離傳輸?shù)入妷旱淖兓瘯容^大，設計時預留足夠的余量，從而保證整個系統(tǒng)工作穩(wěn)定、可靠！負載選定后，輸出電流就基本已經(jīng)確定，大功率電源模塊負載電流的大小是決定功率的關鍵，同時也直接影響到模塊的可靠性和價格。電源模塊較好應用在 30%-80%的功率條件下，前提條件是常溫下使用，如果是高溫或者低溫的環(huán)境，需要考慮到具體的降額設計。選擇合適的輸出電流是設計成功的關鍵因素之一，過大或過小的電流均會導致較低的可靠性和過高的成本。松江區(qū)大功率電源模塊廠電話</p></p><br /><p>文章來源地址: 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