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href="http://plasticsurgerycash.com/" target="_blank">萍鄉(xiāng)市三聯(lián)環(huán)?；すこ逃邢薰?/a> 閱覽次數(shù)：53234次 </p> <div id="8gzv3zcq3zww" class="content"><p style="text-indent:25px">二極管種類有很多，按照所用的半導(dǎo)體材料，可分為鍺二極管（Ge管）和硅二極管（Si管）。根據(jù)其不同用途，可分為檢波二極管、整流二極管、穩(wěn)壓二極管、開關(guān)二極管等。按照管芯結(jié)構(gòu)，又可分為點(diǎn)接觸型二極管、面接觸型二極管及平面型二極管。點(diǎn)接觸型二極管是用一根很細(xì)的金屬絲壓在光潔的半導(dǎo)體晶片表面，通以脈沖電流，使觸絲一端與晶片牢固地?zé)Y(jié)在一起，形成一個(gè)“PN結(jié)”。由于是點(diǎn)接觸，只允許通過較小的電流（不超過幾十毫安），適用于高頻小電流電路，如收音機(jī)的檢波等。面接觸型二極管的“PN結(jié)”面積較大，允許通過較大的電流（幾安到幾十安），主要用于把交流電變換成直流電的“整流”電路中。平面型二極管是一種特制的硅二極管，它不僅能通過較大的電流，而且性能穩(wěn)定可靠，多用于開關(guān)、脈沖及高頻電路中。對(duì)高傳導(dǎo)鍵型二極管而言，能夠得到更優(yōu)良的特性。這類二極管，在負(fù)荷電阻特別低的情況下，整流效率較高。佛山低VF二極管分類</p><p style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="佛山低VF二極管分類,二極管" src="https://img01.71360.com/file/read/www2/M00/17/D3/rBwBEmQjp_qAWz6zAAM2s5yxCQQ651.png"></p><p style="text-indent:25px">二極管又稱晶體二極管,簡稱二極管(diode)，另外，還有早期的真空電子二極管；它是一種具有單向傳導(dǎo)電流的電子器件。在半導(dǎo)體二極管內(nèi)部有一個(gè)PN結(jié)兩個(gè)引線端子，這種電子器件按照外加電壓的方向，具備單向電流的轉(zhuǎn)導(dǎo)性。一般來講，晶體二極管是一個(gè)由p型半導(dǎo)體和n型半導(dǎo)體燒結(jié)形成的p-n結(jié)界面。在其界面的兩側(cè)形成空間電荷層，構(gòu)成自建電場。當(dāng)外加電壓等于零時(shí)，由于p-n結(jié)兩邊載流子的濃度差引起擴(kuò)散電流和由自建電場引起的漂移電流相等而處于電平衡狀態(tài)，這也是常態(tài)下的二極管特性。廣東封裝二極管作用二極管應(yīng)該算是半導(dǎo)體器件家族中的元老了。</p><p style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="佛山低VF二極管分類,二極管" src="https://img01.71360.com/file/read/www2/M00/17/D4/rBwBEmQjqA-AeRTjAAM3uwtt2A4327.png"></p><p style="text-indent:25px">測試二極管的好壞，一）普通二極管的檢測（包括檢波二極管、整流二極管、阻尼二極管、開關(guān)二極管、續(xù)流二極管）是由一個(gè)PN結(jié)構(gòu)成的半導(dǎo)體器件，具有單向?qū)щ娞匦?。通過用萬用表檢測其正、反向電阻值，可以判別出二極管的電極，還可估測出二極管是否損壞。1．極性的判別將萬用表置于R×100檔或R×1k檔，兩表筆分別接二極管的兩個(gè)電極，測出一個(gè)結(jié)果后，對(duì)調(diào)兩表筆，再測出一個(gè)結(jié)果。兩次測量的結(jié)果中，有一次測量出的阻值較大（為反向電阻），一次測量出的阻值較?。檎螂娮瑁?。在阻值較小的一次測量中，黑表筆接的是二極管的正極，紅表筆接的是二極管的負(fù)極。</p><p style="text-indent:25px">二極管的正負(fù)二個(gè)端子。正端A稱為陽極，負(fù)端K稱為陰極。電流只能從陽極向陰極方向移動(dòng)。一些初學(xué)者容易產(chǎn)生這樣一種錯(cuò)誤認(rèn)識(shí)：“半導(dǎo)體的一‘半’是一半的‘半’；而二極管也是只有一‘半’電流流動(dòng)（這是錯(cuò)誤的），所有二極管就是半導(dǎo)體”。其實(shí)二極管與半導(dǎo)體是完全不同的東西。我們只能說二極管是由半導(dǎo)體組成的器件。半導(dǎo)體無論那個(gè)方向都能流動(dòng)電流。二極管的管壓降特性：二極管導(dǎo)通后其管壓降基本不變，對(duì)硅二極管而言這一管壓降是0.6V左右，對(duì)鍺二極管而言是0.2V左右。當(dāng)反向施加電壓時(shí)，二極管是理想的絕緣體。</p><p style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="佛山低VF二極管分類,二極管" src="https://img01.71360.com/file/read/www2/M00/17/D3/rBwBEmQjqASANhkNAALm3aDE3yA153.png"></p><p style="text-indent:25px">肖特基二極管（SchottkyBarrierDiode）它是具有肖特基特性的"金屬半導(dǎo)體結(jié)"的二極管。其正向起始電壓較低。其金屬層除材料外，還可以采用金、鉬、鎳、鈦等材料。其半導(dǎo)體材料采用硅或砷化鎵，多為N型半導(dǎo)體。這種器件是由多數(shù)載流子導(dǎo)電的，所以，其反向飽和電流較以少數(shù)載流子導(dǎo)電的PN結(jié)大得多。由于肖特基二極管中少數(shù)載流子的存貯效應(yīng)甚微，所以其頻率響只為RC時(shí)間常數(shù)限制，因而，它是高頻和快速開關(guān)的理想器件。其工作頻率可達(dá)100GHz。并且，MIS（金屬－絕緣體－半導(dǎo)體）肖特基二極管可以用來制作太陽能電池或發(fā)光二極管。二極管封裝指把硅片上的電路管腳，用導(dǎo)線接引到外部接頭處，以便與其它器件連接?；葜莅l(fā)光二極管特性</p><p style="text-indent:25px">現(xiàn)今較普遍的二極管大多是使用半導(dǎo)體材料如硅或鍺。佛山低VF二極管分類</p><p style="text-indent:25px">它也是一種具有PN結(jié)的二極管。其結(jié)構(gòu)上的特點(diǎn)是：在PN結(jié)邊界處具有陡峭的雜質(zhì)分布區(qū)，從而形成"自助電場"。由于PN結(jié)在正向偏壓下，以少數(shù)載流子導(dǎo)電，并在PN結(jié)附近具有電荷存貯效應(yīng)，使其反向電流需要經(jīng)歷一個(gè)"存貯時(shí)間"后才能降至最小值（反向飽和電流值）。階躍恢復(fù)二極管的"自助電場"縮短了存貯時(shí)間，使反向電流快速截止，并產(chǎn)生豐富的諧波分量。利用這些諧波分量可設(shè)計(jì)出梳狀頻譜發(fā)生電路。快速關(guān)斷（階躍恢復(fù)）二極管用于脈沖和高次諧波電路中。佛山低VF二極管分類</p></div> </div> <div id="8gzv3zcq3zww" class="sxp"> <ul> <li>上一篇：<a 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