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電容器之二極管原理的特性!

來源:jincuigu.com.cn 發布時間:2020-02-19 返回
   電容器之二級管原理的特性
   

電容器

   1、正(zheng)(zheng)向(xiang)(xiang)性:外加(jia)正(zheng)(zheng)向(xiang)(xiang)電(dian)(dian)(dian)(dian)(dian)壓(ya)時(shi),在正(zheng)(zheng)向(xiang)(xiang)特性的起始部(bu)分,正(zheng)(zheng)向(xiang)(xiang)電(dian)(dian)(dian)(dian)(dian)壓(ya)很小(xiao),不(bu)足以克(ke)服PN結內電(dian)(dian)(dian)(dian)(dian)場(chang)的阻擋作用,正(zheng)(zheng)向(xiang)(xiang)電(dian)(dian)(dian)(dian)(dian)流(liu)幾乎為(wei)零,這一(yi)段稱為(wei)死(si)區。這個不(bu)能使(shi)(shi)二級管導(dao)(dao)通的正(zheng)(zheng)向(xiang)(xiang)電(dian)(dian)(dian)(dian)(dian)壓(ya)稱為(wei)死(si)區電(dian)(dian)(dian)(dian)(dian)壓(ya)。當正(zheng)(zheng)向(xiang)(xiang)電(dian)(dian)(dian)(dian)(dian)壓(ya)大于死(si)區電(dian)(dian)(dian)(dian)(dian)壓(ya)以后,PN結內電(dian)(dian)(dian)(dian)(dian)場(chang)被克(ke)服,二級管正(zheng)(zheng)向(xiang)(xiang)導(dao)(dao)通,電(dian)(dian)(dian)(dian)(dian)流(liu)隨電(dian)(dian)(dian)(dian)(dian)壓(ya)增大而迅速上升。在正(zheng)(zheng)常使(shi)(shi)用的電(dian)(dian)(dian)(dian)(dian)流(liu)范(fan)圍內,導(dao)(dao)通時(shi)二級管的端電(dian)(dian)(dian)(dian)(dian)壓(ya)幾乎維持(chi)不(bu)變,這個電(dian)(dian)(dian)(dian)(dian)壓(ya)稱為(wei)二級管的正(zheng)(zheng)向(xiang)(xiang)電(dian)(dian)(dian)(dian)(dian)壓(ya)。
   
   2、反向(xiang)性:外加(jia)反向(xiang)電(dian)壓不過(guo)一定范圍時,通(tong)過(guo)二(er)級管(guan)(guan)的(de)電(dian)流(liu)(liu)是少數載流(liu)(liu)子(zi)漂移運動所形成反向(xiang)電(dian)流(liu)(liu)。由于(yu)反向(xiang)電(dian)流(liu)(liu)很小,二(er)級管(guan)(guan)處于(yu)截止(zhi)狀態。這個反向(xiang)電(dian)流(liu)(liu)又稱為反向(xiang)飽和(he)電(dian)流(liu)(liu)或漏(lou)電(dian)流(liu)(liu),二(er)級管(guan)(guan)的(de)反向(xiang)飽和(he)電(dian)流(liu)(liu)受溫度影響很大(da)。
   
   電解電容
   
   簡介(jie):金(jin)屬(shu)箔(bo)為正級(鋁(lv)或鉭(tan)),與正級緊貼金(jin)屬(shu)的氧(yang)化(hua)膜(氧(yang)化(hua)鋁(lv)或五(wu)氧(yang)化(hua)二鉭(tan))是電(dian)(dian)介(jie)質(zhi),陰級由導電(dian)(dian)材料(liao)、電(dian)(dian)解(jie)(jie)質(zhi)(電(dian)(dian)解(jie)(jie)質(zhi)可以是液體或固(gu)體)和其他材料(liao)共同組成,因電(dian)(dian)解(jie)(jie)質(zhi)是陰級的主要部分,電(dian)(dian)解(jie)(jie)電(dian)(dian)容因此(ci)而得名。
   
   特點及應用:
   
   1.電解電容器有級性、容量大(da)、泄漏(lou)電流大(da)。
   
   2.在電(dian)源(yuan)(yuan)電(dian)路或中低頻電(dian)路中起電(dian)源(yuan)(yuan)濾(lv)波、退耦(ou)、信號耦(ou)合(he)及隔直流等(deng)作用。
   
   3.價格便宜,使用廣泛。
   
   這就是電容(rong)器之(zhi)二級(ji)管原理的特性