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class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)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>洛陽史賽克X7000冷光源更換高壓包,X7000</p><p><span>***更新：</span>2021-01-13 05:13:07</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="jw7dovb" 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="ayfhdp3" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="oqh2szv" class="box"><p><p> 非常經(jīng)典的22個(gè)開關(guān)電源設(shè)計(jì)問題！問題一我們小功率用到多的反激電源，為什么我們常常選擇65K或者100K（這些頻率段附近）作為開關(guān)頻率？有哪些原因制約了？或者哪些情況下我們可以增大開關(guān)頻率？或者減小開關(guān)頻率？開關(guān)電源為什么常常選擇65K或者100K左右范圍作為開關(guān)頻率，有的人會(huì)說IC廠家都是生產(chǎn)這樣的IC，當(dāng)然這也有原因。每個(gè)電源的開關(guān)頻率會(huì)決定什么？應(yīng)該從這里去思考原因。還會(huì)有人說頻率高了EMC不好過，一般來說是這樣，但這不是必然，洛陽史賽克X7000冷光源更換高壓包，EMC與頻率有關(guān)系，但不是必然。想象我們的電源開關(guān)頻率提高了，直接帶來的影響是什么?當(dāng)然是MOS開關(guān)損耗增大，因?yàn)閱挝粫r(shí)間開關(guān)次數(shù)增多了。如果頻率減小了會(huì)帶來什么？開關(guān)損耗是減小了，但是我們的儲(chǔ)能器件單周期提供的能量就要增多，勢(shì)必需要的變壓器磁性要更大，儲(chǔ)能電感要更大了。選取在65K到100K左右就是一個(gè)比較合適的經(jīng)驗(yàn)折中，電源就是在折中合理化折中進(jìn)行。假如在特殊情形下，輸入電壓比較低，洛陽史賽克X7000冷光源更換高壓包，開關(guān)損耗已經(jīng)很小了，不在乎這點(diǎn)開關(guān)損耗嗎，那我們就可以提高開關(guān)頻率，洛陽史賽克X7000冷光源更換高壓包，起到減小磁性器件體積的目的。本問關(guān)鍵：如何選擇合適IC的開關(guān)頻率？主流IC的開關(guān)頻率為什么是大概是這么一些范圍？開關(guān)頻率和什么有關(guān)。美國許多大公司做過許多實(shí)驗(yàn)，證實(shí)人體經(jīng)常隨身攜帶的靜電可對(duì)許多電子元件產(chǎn)生災(zāi)難性的破壞。洛陽史賽克X7000冷光源更換高壓包</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="洛陽史賽克X7000冷光源更換高壓包,X7000" src="https://tyunfile.71360.com/UploadFile/leihuo/637397543304713845/4419356.png"></div><p> 解決這一問題已是迫在眉睫。而影響電源EMC超標(biāo)的主要原因就是：輸入濾波電路的設(shè)計(jì)不合理。到目前為止，還沒有介紹電源輸入濾波電路設(shè)計(jì)方法的報(bào)道。本文首先對(duì)電源輸入濾波電路設(shè)計(jì)方法進(jìn)行全部、詳細(xì)的討論，提出了一套簡單實(shí)用的濾波電路，并應(yīng)用到我司的電源產(chǎn)品中。給出的測(cè)試結(jié)果和理論分析證明了該設(shè)計(jì)方法的實(shí)用性和可行性。輸入濾波電路的拓?fù)浣Y(jié)構(gòu)優(yōu)化設(shè)計(jì)輸入電路中主要包含五個(gè)元件：共模、差模電感，X、Y電容，放電電阻。輸入濾波電路的設(shè)計(jì)，事實(shí)上就是將這些元件如何進(jìn)行組合的問題，但在進(jìn)行組合時(shí)必須遵循一定的原則。1、對(duì)輸入濾波電路的要求1．1雙向?yàn)V波功能。對(duì)電網(wǎng)開關(guān)整流器及開關(guān)整流器電網(wǎng)的干擾信號(hào)均有很好的濾波效果。1．2能控制共模和差模干擾。能控制相線與相線、相線與中線之間的差模干擾及相線、中線與大地之間的共模干擾。工程設(shè)計(jì)中重點(diǎn)考慮共模干擾的控制。為了控制差模和共模干擾，通常的在濾波電路中同時(shí)包含有差模和共模電感，但基于以下原因差模電感可去掉：（1）共模干擾的影響更大，而差模干擾的影響要小得多。一方面同樣程度的共模和差模干擾，共模干擾所產(chǎn)生的電磁場(chǎng)輻射高出差模34個(gè)量級(jí)；另一方面。洛陽史賽克X7000冷光源更換高壓包干擾與噪音是心電、腦電及許多醫(yī)療儀器時(shí)常碰到的問題，是維修人員甚為頭暈的故障之一。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="洛陽史賽克X7000冷光源更換高壓包,X7000" src="https://tyunfile.71360.com/WaterMark/UploadFile/leihuo/637397543307780184/9938678.png"></div><p> 分別所占據(jù)的弧度不能超過160度。多層繞制很少見，因?yàn)檫@將使分布電容增加，影響共模電感的高頻性能。前面已根據(jù)輸入電流確定了線圈的尺寸，再依據(jù)所選定的磁芯，就可計(jì)算大匝數(shù)了。如果選定磁芯內(nèi)徑為Df，繞制電感的線徑為D，則該磁芯能繞下的大匝數(shù)為Nmax：Nmax=[160×π×(Df-D)]/(360×D)（8）第四步：根據(jù)磁芯的磁導(dǎo)率或電感因子，估算電感。如果磁芯磁導(dǎo)率為μ，對(duì)應(yīng)的電感因子為AL，單位為：nH/N2，則電感可根據(jù)下式進(jìn)行估算：L=Nmax2×AL/106(mH)（9）第五步：校正電感。如果上式計(jì)算的電感小于LS，則應(yīng)選磁導(dǎo)率更大或磁芯尺寸更大的材料，重復(fù)上述過程，直到L>LS為止。當(dāng)然也可在磁芯維持不變的情況下，減小線圈尺寸，增加匝數(shù)，以使電感量變大，但這會(huì)增加銅損（建議盡可能不采用此方法）。再補(bǔ)充一點(diǎn)：在體積容許的情況下，盡可能選用大一些的磁芯，這可在保證相同的電感量時(shí)，減少線圈匝數(shù)，使分布電容減小。下面我們就以50A單體為例說明磁芯材料的選擇和匝數(shù)計(jì)算方法(1)L1=L3=，輸入大電流有效值為Iinmax=18A.設(shè)計(jì)步驟如下：首先步：確定繞線尺寸。第二步：選擇滿足尺寸要求的磁芯。選用環(huán)形Mn-Zn鐵氧體材料MAO7A，型號(hào)為R48×30×15，AL=9870(nH/N2)。</p><p> 觀點(diǎn)二保護(hù)升壓管D1說法，有一定的道理，因?yàn)镈1是快速恢復(fù)二極管，承受浪涌電流的能力較弱，減小反向恢復(fù)電流和提高浪涌電壓承載力是相互牽制的，而D1所采用的普通整流二極管承受浪涌電流的能力很強(qiáng)，如1N5407的額定電流3A，浪涌電流可達(dá)200A。不過由于升壓二極管D1有串接的PFC電感L的限流作用，筆者認(rèn)為保護(hù)二極管D2的主要作用還不**是保護(hù)升壓管D1。一些資料也有說明并聯(lián)二極管D2是減少開機(jī)過程的浪涌電壓，這個(gè)總體的說法沒錯(cuò)，但我認(rèn)為該保護(hù)二極管D2表面降低的是對(duì)PFC電感和升壓二極管的浪涌沖擊，但實(shí)際上還有一個(gè)重要的作用：保護(hù)PFC開關(guān)管。在開機(jī)的瞬間，濾波電容的電壓尚未建立，由于要對(duì)大電容充電，通過PFC電感的電流相對(duì)比較大，有可能在電源開關(guān)接通的瞬間是在正弦波的大值，在對(duì)電容充電的過程中PFC電感L有可能會(huì)出現(xiàn)磁飽和的情況，如果此時(shí)PFC電路工作，就麻煩了，流過PFC開關(guān)管的電流就會(huì)失去限制，燒壞開關(guān)管。為防止悲劇發(fā)生，一種方法是對(duì)PFC電路的工作時(shí)序加以控制，即當(dāng)對(duì)大電容的充電完成以后，再啟動(dòng)PFC電路；另一種比較簡單的辦法就是并接在PFC線圈和升壓二極管上一個(gè)旁路二極管，啟動(dòng)瞬間給大電容的充電提供另一個(gè)支路。間歇性故障修理實(shí)用的方法為故障分析法結(jié)合換板替代法、敲擊法或變溫法等。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="洛陽史賽克X7000冷光源更換高壓包,X7000" src="https://tyunfile.71360.com/UploadFile/leihuo/637397543306325080/6266931.png"></div><p> 概述電感器變壓器典型應(yīng)用電路開關(guān)電源電路EMI濾波典型電路差模噪聲、共模噪聲及差模電感器、共模電感器共模電感器設(shè)計(jì)開關(guān)電源產(chǎn)生的共模噪聲頻率范圍從10kHz～50MHz甚至更高，為了對(duì)這些噪聲有效的衰減，那么在這個(gè)頻率范圍內(nèi)，共模電感器就必須提供足夠高的阻抗。因此高磁導(dǎo)率的錳鋅鐵氧體和非晶材料是非常適合的。共模電感器的阻抗Zs由串聯(lián)感抗Xs和串聯(lián)電阻Rs兩部分組成，Zs、Xs、Rs三者隨頻率變化的典型趨勢(shì)見下圖。從圖中我們可以看出在750kHz以下，Xs在Zs中占主要部分，750kHz以上Rs在Zs中占主要部分。對(duì)于控制共模噪聲的電感器，需要在一個(gè)磁芯上繞制兩組電流方向相反的導(dǎo)線，并使用高磁導(dǎo)率的磁芯，如磁導(dǎo)率為5k、7k、10k、12k、15k材料和非晶磁芯等。差模電感的設(shè)計(jì)對(duì)于控制差模噪聲的電感器，要求磁芯材料在偏磁場(chǎng)下仍然能夠保持磁導(dǎo)率指標(biāo)。下圖中，標(biāo)出了流經(jīng)電感器的電流I，電壓V和磁芯中的磁場(chǎng)強(qiáng)度曲線，并且畫出了差模濾波器和共模濾波器在開關(guān)電源中的應(yīng)用線路圖。在輸入端，可以是交流輸入（如市電），也可以是電池供電（如48V，用于電信設(shè)備中）。當(dāng)電池供電時(shí)，磁化電流是恒定的直流電。對(duì)于高功率因數(shù)的交流電系統(tǒng)，磁化電流接近正弦波波形。對(duì)干擾源采用屏蔽技術(shù)、濾波技術(shù)或加強(qiáng)接地以減小干擾輻射。洛陽史賽克X7000冷光源更換高壓包</p><p style="text-indent:25px">大多數(shù)間歇性故障是由于存在虛焊點(diǎn)，接插件接觸不好。洛陽史賽克X7000冷光源更換高壓包</p><p> 二、移動(dòng)通信手持機(jī)鋰電池的安全要求和試驗(yàn)方法一般要求本標(biāo)準(zhǔn)對(duì)電池的電路和結(jié)構(gòu)設(shè)計(jì)提出了一些建議，希望生產(chǎn)廠家在電池的設(shè)計(jì)環(huán)節(jié)能充分考慮到電池的安全性。絕緣與配線常見的電池外殼都是非金屬的，但有的電池也采用金屬外殼，后種情況下電池的電極終端與電池的金屬外殼之間的絕緣電阻在500V直流電壓下測(cè)量應(yīng)大于5M&O1527;，除非電池的電極終端與電池的金屬外殼有連通。手機(jī)電池并非電池芯的簡單組合，電池芯之外還有保護(hù)電路和控制電路，其內(nèi)部配線及絕緣應(yīng)充分滿足預(yù)計(jì)的大電流、電壓和溫度的要求，配線的排布應(yīng)保證端子之間有足夠的間隙和絕緣穿透距離，內(nèi)部連接的整體性能應(yīng)充分滿足可能發(fā)生誤操作時(shí)的安全要求。泄放泄放的含義即電池或電池芯內(nèi)部的過高壓力在安全閥處釋放以防止其破裂或。標(biāo)準(zhǔn)要求電池或電池芯在內(nèi)部壓力過高達(dá)到一定限值時(shí)能以一定的速率將壓力泄放以防止電池的破裂、和自燃。如果電池的電池芯被封裝在外殼內(nèi)，則該封裝的形式和封裝的方法在正常操作過程中不應(yīng)引起電池過熱，也不應(yīng)約束內(nèi)部壓力的泄放。溫度/電流管理電池充電過程中，電池和充電器內(nèi)部的電路都會(huì)產(chǎn)生熱量，若散熱不佳導(dǎo)致熱量聚**影響電池正常的化學(xué)反應(yīng)過程。洛陽史賽克X7000冷光源更換高壓包</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(duì)和良好的市場(chǎng)口碑。公司自成立以來，以質(zhì)量為發(fā)展，讓匠心彌散在每個(gè)細(xì)節(jié)，公司旗下內(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)器械類維修深受客戶的喜愛。公司注重以質(zhì)量為中心，以服務(wù)為理念，秉持誠信為本的理念，打造儀器儀表良好品牌。成都鐳伙科技秉承“客戶為尊、服務(wù)為榮、創(chuàng)意為先、技術(shù)為實(shí)”的經(jīng)營理念，全力打造公司的重點(diǎn)競爭力。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2824321.html</p></div></div></div></div></div><div id="mvcevlc" class="page-right twoColRt"><div id="velxeam" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="22oq2a8" 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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