電動汽(qi)車充電樁漏(lou)(lou)(lou)(lou)電流(liu)一般分為(wei)四種(zhong)，分別為(wei)：半導(dao)體元件漏(lou)(lou)(lou)(lou)電流(liu)、電源漏(lou)(lou)(lou)(lou)電流(liu)、電容漏(lou)(lou)(lou)(lou)電流(liu)和濾波器漏(lou)(lou)(lou)(lou)電流(liu)。
1、半導體原(yuan)件漏(lou)電流
PN結在(zai)截上時流(liu)過的很微(wei)小的電(dian)(dian)流(liu)。D-S正(zheng)向偏置，G-S反向偏置，導電(dian)(dian)溝道打開后，D到S才會有電(dian)(dian)流(liu)流(liu)過。但實際上由于(yu)自由電(dian)(dian)子的存在(zai)，自由電(dian)(dian)子的附(fu)著在(zai)SIO2和N+、導致D-S有漏(lou)電(dian)(dian)流(liu)。
2、電(dian)源漏電(dian)流(liu)
開關(guan)(guan)電(dian)(dian)源中(zhong)為(wei)了減少干擾(rao)，按(an)照國標，必須設有(you)EMI濾(lv)波(bo)器電(dian)(dian)路。由于EMI電(dian)(dian)路的關(guan)(guan)系，使得在(zai)開關(guan)(guan)電(dian)(dian)源在(zai)接上市電(dian)(dian)后對(dui)地有(you)一個微小的電(dian)(dian)流，這就是漏(lou)電(dian)(dian)流。如(ru)果不接地，計算(suan)機(ji)(ji)的外殼會(hui)對(dui)地帶有(you)110伏電(dian)(dian)壓，用手摸會(hui)有(you)麻的感覺，同(tong)時對(dui)計算(suan)機(ji)(ji)工作也會(hui)造(zao)成影響。
3、電(dian)容漏電(dian)流
電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)介質不可(ke)能..不導電(dian)(dian)(dian)(dian);當電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)加上直流(liu)電(dian)(dian)(dian)(dian)壓(ya)時(shi)，電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)器會(hui)有漏電(dian)(dian)(dian)(dian)流(liu)產生。若(ruo)漏電(dian)(dian)(dian)(dian)流(liu)太大(da)，電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)器就會(hui)發熱損(sun)壞。除電(dian)(dian)(dian)(dian)解電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)外，其(qi)他電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)器的漏電(dian)(dian)(dian)(dian)流(liu)是極小(xiao)的，故(gu)用絕(jue)緣電(dian)(dian)(dian)(dian)阻參數來表示其(qi)絕(jue)緣性能，而(er)電(dian)(dian)(dian)(dian)解電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)因(yin)漏電(dian)(dian)(dian)(dian)較大(da)，故(gu)用漏電(dian)(dian)(dian)(dian)流(liu)表示其(qi)絕(jue)緣性能(與容(rong)(rong)(rong)量成正比)。對電(dian)(dian)(dian)(dian)容(rong)(rong)(rong)器施加額定(ding)直流(liu)工作電(dian)(dian)(dian)(dian)壓(ya)將觀察到(dao)充(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流(liu)的變化開始很大(da)，隨著時(shi)間(jian)而(er)下降，到(dao)某一終值(zhi)時(shi)達到(dao)較穩定(ding)狀態這(zhe)一終值(zhi)電(dian)(dian)(dian)(dian)流(liu)稱(cheng)為漏電(dian)(dian)(dian)(dian)流(liu)。 i=kcu(ua);其(qi)中k值(zhi)為漏電(dian)(dian)(dian)(dian)流(liu)常數 ,單位(wei)為μa(v:μf)。
4、濾波(bo)器漏電流
電源濾(lv)波(bo)(bo)器(qi)(qi)漏(lou)電流(liu)(liu)定(ding)(ding)義為：在額定(ding)(ding)交流(liu)(liu)電壓(ya)下濾(lv)波(bo)(bo)器(qi)(qi)外殼到交流(liu)(liu)進(jin)線任(ren)意端的(de)(de)電流(liu)(liu)。如果(guo)濾(lv)波(bo)(bo)器(qi)(qi)的(de)(de)所有(you)端口與外殼之間是完全(quan)絕緣的(de)(de)，則漏(lou)電流(liu)(liu)的(de)(de)值主要取(qu)決(jue)于共模(mo)電容CY的(de)(de)漏(lou)電流(liu)(liu)，即主要取(qu)決(jue)于CY的(de)(de)容量。由于濾(lv)波(bo)(bo)器(qi)(qi)漏(lou)電流(liu)(liu)的(de)(de)大小(xiao)，涉(she)及到人身安(an)全(quan)，國際上各國對(dui)它(ta)都有(you)嚴格的(de)(de)標準規定(ding)(ding)，對(dui)于是220V/50Hz交流(liu)(liu)電網供(gong)電，一般要求噪聲(sheng)濾(lv)波(bo)(bo)器(qi)(qi)的(de)(de)漏(lou)電流(liu)(liu)小(xiao)于1mA。
