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id="aa6a6a4" class="content"> 介紹二極管為什么單向?qū)щ?br /> <div>二極管是電子電路中很常用的元器件，具有正向?qū)ǎ聪蚪刂沟奶匦浴?/div> <div>在二極管的正向端（正極）加正電壓，負(fù)向端（負(fù)極）加負(fù)電壓，二極管導(dǎo)通，有電流流過二極管。</div> <div>在二極管的正向端（正極）加負(fù)電壓，負(fù)向端（負(fù)極）加正電壓，二極管截止，沒有電流流過二極管。</div> <div>這就是所說的二極管的單向?qū)ㄌ匦浴?/div> <div>下面解釋為什么二極管會(huì)單向?qū)ā?/div> <div>二極管的單向?qū)щ娦?/div> <div>二極管是由PN結(jié)組成的，即P型半導(dǎo)體和N型半導(dǎo)體，因此PN結(jié)的特性導(dǎo)致了二極管的單向?qū)щ娞匦浴N結(jié)如圖1所示。<br /> <img alt="二極管為什么單向?qū)щ? src="http://eklemacademy.com/uploadfile/2024/1014/20241014090325952.png" style="width: 1080px; height: 867px;" /></div> <div>圖1 PN結(jié)示意圖</div> <div>在P型和N型半導(dǎo)體的交界面附近，由于N區(qū)的自由電子濃度大，于是帶負(fù)電荷的自由電子會(huì)由N區(qū)向電子濃度低的P區(qū)擴(kuò)散；擴(kuò)散的結(jié)果使PN結(jié)中靠P區(qū)一側(cè)帶負(fù)電，靠N區(qū)一側(cè)帶正電，形成由N區(qū)指向P區(qū)的電場(chǎng)，即PN結(jié)內(nèi)電場(chǎng)。內(nèi)電場(chǎng)將阻礙多數(shù)載流子的繼續(xù)擴(kuò)散，又稱為阻擋層。</div> <div>PN結(jié)詳解</div> <div>二極管的單向?qū)щ娞匦杂猛竞軓V，到底是什么原因讓電子如此聽話呢？它的微觀機(jī)理是什么呢？這里簡(jiǎn)單形象介紹一下。</div> <div>假設(shè)有一塊P型半導(dǎo)體（用黃色代表空穴多）和一塊N型半導(dǎo)體（用綠色代表電子多），它們自然狀態(tài)下分別都是電中性的，即不帶電。如圖2所示。<br /> <img alt="二極管為什么單向?qū)щ? src="http://eklemacademy.com/uploadfile/2024/1014/20241014090409512.png" style="width: 398px; height: 199px;" /></div> <div>圖2 P型和N型半導(dǎo)體</div> <div>把它們結(jié)合在一起，就形成PN結(jié)。邊界處N型半導(dǎo)體的電子自然就會(huì)跑去P型區(qū)填補(bǔ)空穴，留下失去電子而顯正電的原子。</div> <div>相應(yīng)P型區(qū)邊界的原子由于得到電子而顯負(fù)電，于是就在邊界形成一個(gè)空間電荷區(qū)。</div> <div>為什么叫“空間電荷區(qū)”？是因?yàn)檫@些電荷是微觀空間內(nèi)無法移動(dòng)的原子構(gòu)成的。</div> <div>空間電荷區(qū)形成一個(gè)內(nèi)建電場(chǎng)，電場(chǎng)方向由N到P，這個(gè)電場(chǎng)阻止了后面的電子繼續(xù)過來填補(bǔ)空穴，因?yàn)檫@時(shí)P型區(qū)的負(fù)空間電荷是排斥電子的。</div> <div>電子和空穴的結(jié)合會(huì)越來越慢，最后達(dá)到平衡，相當(dāng)于載流子耗盡了，所以空間電荷區(qū)也叫耗盡層。</div> <div>這時(shí)PN結(jié)整體還呈電中性，因?yàn)榭臻g電荷有正有負(fù)互相抵消。如圖3所示。<br /> <img alt="二極管為什么單向?qū)щ? src="http://eklemacademy.com/uploadfile/2024/1014/20241014090436930.png" style="width: 399px; height: 250px;" /></div> <div>圖3 PN結(jié)形成內(nèi)建電場(chǎng)</div> <div>外加正向電壓，電場(chǎng)方向由正到負(fù)，與內(nèi)建電場(chǎng)相反，削弱了內(nèi)建電場(chǎng)，所以二極管容易導(dǎo)通。</div> <div>綠色箭頭表示電子流動(dòng)方向，與電流定義的方向相反。如圖4所示。<br /> <img alt="二極管為什么單向?qū)щ? src="http://eklemacademy.com/uploadfile/2024/1014/20241014090526930.png" style="width: 399px; height: 245px;" /></div> <div>圖4 正向?qū)顟B(tài)</div> <div>外加反向電壓，電場(chǎng)方向與內(nèi)建電場(chǎng)相同，增強(qiáng)了內(nèi)建電場(chǎng)，所以二極管不容易導(dǎo)通。如圖5所示。</div> <div>當(dāng)然，不導(dǎo)通也不是絕對(duì)的，一般會(huì)有很小的漏電流。隨著反向電壓如果繼續(xù)增大，可能造成二極管擊穿而急劇漏電。<br /> <img alt="二極管為什么單向?qū)щ? src="http://eklemacademy.com/uploadfile/2024/1014/20241014090549504.png" style="width: 422px; height: 255px;" /></div> <div>圖5 反向不導(dǎo)通狀態(tài)</div> <div>圖6是二極管的電流電壓曲線供參考。<br /> <img alt="二極管為什么單向?qū)щ? src="http://eklemacademy.com/uploadfile/2024/1014/20241014090616467.png" style="width: 471px; height: 267px;" /></div> <div>圖6 二極管電流電壓曲線</div> <div>圖7形象的展示了不同方向二極管為什么能導(dǎo)通和不能導(dǎo)通，方便理解。<br /> <img alt="二極管為什么單向?qū)щ? src="http://eklemacademy.com/uploadfile/2024/1014/20241014090631155.png" style="width: 600px; height: 493px;" /></div> <div>圖7 不同方向?qū)ㄐЧ煌?/div> <div>生活中單向?qū)ǖ睦右膊簧伲热绲罔F進(jìn)站口的單向閘機(jī)，也相當(dāng)于二極管的效果：正向?qū)ǎ聪虿粚?dǎo)通，如果硬要反向通過，可能就會(huì)因?yàn)樘罅?ldquo;反向擊穿”破壞閘機(jī)了。<br /> <img alt="二極管為什么單向?qū)щ? src="http://eklemacademy.com/uploadfile/2024/1014/20241014090644644.png" style="width: 1080px; height: 608px;" />〈烜芯微/XXW〉專業(yè)制造二極管，三極管，MOS管，橋堆等，20年，工廠直銷省20%，上萬家電路電器生產(chǎn)企業(yè)選用，專業(yè)的工程師幫您穩(wěn)定好每一批產(chǎn)品，如果您有遇到什么需要幫助解決的,可以直接聯(lián)系下方的聯(lián)系號(hào)碼或加QQ/微信，由我們的銷售經(jīng)理給您精準(zhǔn)的報(bào)價(jià)以及產(chǎn)品介紹</div> <div> </div> <div>聯(lián)系號(hào)碼：18923864027（同微信）<br /> </div> QQ：709211280 </div> <ul class="fy"> <li>上一篇：<a href="http://eklemacademy.com/2024/changjianwtjd_1014/8560.html">用晶體管,三極管以PWM波形來驅(qū)動(dòng)風(fēng)扇的電路圖介紹</a></li> <li>下一篇：<a href="javascript:alert('最后一頁');">最后一頁</a></li> </ul> <div id="aa6a6a4" class="n_part2">相關(guān)閱讀</div> <ul class="n_list1"> 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