J9九游会AG

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当前位置(zhi) 产业新(xin)闻(wen) 二极管特性(xing)曲(qu)线是怎么样的(de)呢?

二极管特性曲线是怎么样的呢?

  二极管特性曲线

  与PN结一(yi)样,二极管具有单向导电(dian)性。硅(gui)二极管典型伏安

  特(te)性(xing)曲线(图)。在二极管(guan)(guan)加有正向电(dian)(dian)压(ya)(ya)(ya)(ya),当(dang)电(dian)(dian)压(ya)(ya)(ya)(ya)值较小时(shi),电(dian)(dian)流(liu)(liu)极小;当(dang)电(dian)(dian)压(ya)(ya)(ya)(ya)超过0.6V时(shi),电(dian)(dian)流(liu)(liu)开始(shi)按指数(shu)规(gui)律(lv)增大,通(tong)(tong)常称此为二极管(guan)(guan)的(de)开启(qi)电(dian)(dian)压(ya)(ya)(ya)(ya);当(dang)电(dian)(dian)压(ya)(ya)(ya)(ya)达(da)到约(yue)0.7V时(shi),二极管(guan)(guan)处(chu)于完全导通(tong)(tong)状态,通(tong)(tong)常称此电(dian)(dian)压(ya)(ya)(ya)(ya)为二极管(guan)(guan)的(de)导通(tong)(tong)电(dian)(dian)压(ya)(ya)(ya)(ya),用符号(hao)UD表示(shi)。

  对于锗(zhe)二(er)极管(guan),开启(qi)电(dian)压(ya)(ya)为(wei)0.2V,导通电(dian)压(ya)(ya)UD约(yue)为(wei)0.3V。在二(er)极管(guan)加有反(fan)(fan)向电(dian)压(ya)(ya),当(dang)电(dian)压(ya)(ya)值(zhi)较小时,电(dian)流极小,其电(dian)流值(zhi)为(wei)反(fan)(fan)向饱和电(dian)流IS。当(dang)反(fan)(fan)向电(dian)压(ya)(ya)超过(guo)某个值(zhi)时,电(dian)流开始急剧增大,称之(zhi)为(wei)反(fan)(fan)向击(ji)穿(chuan),称此电(dian)压(ya)(ya)为(wei)二(er)极管(guan)的反(fan)(fan)向击(ji)穿(chuan)电(dian)压(ya)(ya),用符(fu)号UBR表示。不同型(xing)号的二(er)极管(guan)的击(ji)穿(chuan)电(dian)压(ya)(ya)UBR值(zhi)差别很大,从几(ji)十伏(fu)到几(ji)千伏(fu)。

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