140DRC83000 Quantum
設(shè)計(jì)方法包括對(duì)稱結(jié)構(gòu)，也稱為反向阻斷架構(gòu)。它們具有正向和反向阻斷功能，適合交流應(yīng)用，例如矩陣（AC-to-AC）轉(zhuǎn)換器或三電平逆變器。非對(duì)稱結(jié)構(gòu)僅保持正向阻斷能力，但往往比對(duì)稱結(jié)構(gòu)更廣泛地使用，因?yàn)樗鼈兺ǔＬ峁┍葘?duì)稱 IGBT 更低的通態(tài)電壓降。不對(duì)稱結(jié)構(gòu)適合直流應(yīng)用，例如變速電機(jī)控制。然而，IGBT 電機(jī)控制應(yīng)用往往涉及感性負(fù)載并且通常是硬開關(guān)，需要將 IGBT 與續(xù)流二極管并聯(lián)使用，以允許反向電流在這些拓?fù)渲辛鲃?dòng)。然而，
IGBT 的另一個(gè)區(qū)別在于穿通 （PT） 和非穿通 （NPT） 架構(gòu)。PT 設(shè)計(jì)主要用于較低的隔離電壓，并使用在 P+ 襯底和集電極區(qū)域上生長(zhǎng)的 N+ 區(qū)域。當(dāng)器件關(guān)閉時(shí)，N-漂移會(huì)完全耗盡載流子，這種效應(yīng)會(huì)“穿透”到下面的 N+ 層，但不會(huì)完全穿過(guò)它進(jìn)入集電極。結(jié)果是一個(gè)非常薄的 N 區(qū)域，可大限度地降低開啟電壓。額外的 N+ 層還通過(guò)減少注入 P+ 襯底的多余空穴的數(shù)量來(lái)提高開關(guān)速度。當(dāng)設(shè)備關(guān)閉時(shí)，這些載體會(huì)很快被移除。
不幸的是，高摻雜會(huì)引入大量少數(shù)載流子，需要在 IGBT 關(guān)斷后去除這些載流子，這會(huì)增加開關(guān)時(shí)間，從而降低效率。這是與功率 MOSFET 相比開關(guān)頻率較低的主要原因之一。PT IGBT 也可能遭受熱失控。
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