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電動汽車充電樁中漏電流的原因

2021.08.18

盡管是少數原因，但是充電樁漏電流這種情況可能會發生，那么出現這種情況應該怎么辦呢？合肥充電樁漏電流一般分為四種,分別為:半導體元件漏電流、電源漏電流、電容漏電流和濾波器漏電流,你知道電動汽車充電樁中漏電流的原因嗎？

1、半導(dao)體原(yuan)件漏(lou)電流

PN結在截(jie)上時(shi)流(liu)過的(de)很微小(xiao)的(de)電(dian)流(liu)。D-S正向偏置(zhi),G-S反向偏置(zhi),導電(dian)溝道(dao)打開后(hou),D到S才會有(you)(you)電(dian)流(liu)流(liu)過。但實際(ji)上由(you)于自(zi)由(you)電(dian)子(zi)的(de)存在,自(zi)由(you)電(dian)子(zi)的(de)附著在SIO2和N+、導致D-S有(you)(you)漏電(dian)流(liu)。

2、電源漏電流

開(kai)關電源(yuan)中(zhong)為了減少干擾,按(an)照國標，必須設有EMI濾波器電路。由于EMI電路的(de)關系,使得在開(kai)關電源(yuan)在接(jie)上市電后對地(di)有一個微小的(de)電流,這(zhe)就是漏電流。如果不(bu)接(jie)地(di),計(ji)算機的(de)外殼會對地(di)帶有110伏(fu)電壓,用手摸會有麻的(de)感覺,同時對計(ji)算機工作也會造成影響。電動汽車充電樁

3、電容漏電流

電(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)介質不可能(neng)不導電(dian)(dian)(dian)(dian)(dian)(dian);當電(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)加上直流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)時(shi),電(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)器(qi)會有(you)漏(lou)(lou)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)產生。若漏(lou)(lou)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)太(tai)大，電(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)器(qi)就(jiu)會發(fa)熱損壞。除電(dian)(dian)(dian)(dian)(dian)(dian)解(jie)電(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)外,其(qi)(qi)(qi)他電(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)器(qi)的(de)漏(lou)(lou)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)是(shi)小(xiao)的(de),故用絕(jue)緣(yuan)電(dian)(dian)(dian)(dian)(dian)(dian)阻參數來表示其(qi)(qi)(qi)絕(jue)緣(yuan)性(xing)能(neng)，而電(dian)(dian)(dian)(dian)(dian)(dian)解(jie)電(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)因漏(lou)(lou)電(dian)(dian)(dian)(dian)(dian)(dian)較大,故用漏(lou)(lou)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)表示其(qi)(qi)(qi)絕(jue)緣(yuan)性(xing)能(neng)(與容(rong)(rong)(rong)(rong)量成正(zheng)比)。對電(dian)(dian)(dian)(dian)(dian)(dian)容(rong)(rong)(rong)(rong)器(qi)施加額定(ding)直流(liu)(liu)工(gong)作電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)將(jiang)觀察到(dao)充電(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)的(de)變化開始很大,隨著時(shi)間而下降,到(dao)某一終值(zhi)時(shi)達(da)到(dao)較穩(wen)定(ding)狀態這一終值(zhi)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)稱為漏(lou)(lou)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)。i=kcu(ua);其(qi)(qi)(qi)中(zhong)k值(zhi)為漏(lou)(lou)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)常數,單位為μa(v:μf)

4、濾波(bo)器漏電流

電(dian)源濾(lv)(lv)波(bo)(bo)器(qi)漏(lou)電(dian)流(liu)(liu)定義為:在額定交(jiao)流(liu)(liu)電(dian)壓(ya)下(xia)濾(lv)(lv)波(bo)(bo)器(qi)外殼(ke)到交(jiao)流(liu)(liu)進線任意端(duan)的電(dian)流(liu)(liu)。如(ru)果濾(lv)(lv)波(bo)(bo)器(qi)的所有端(duan)口(kou)與(yu)外殼(ke)之間是完全絕(jue)緣的,則(ze)漏(lou)電(dian)流(liu)(liu)的值主要取決于(yu)(yu)(yu)共模電(dian)容CY的漏(lou)電(dian)流(liu)(liu)，即主要取決于(yu)(yu)(yu)CY的容量。由于(yu)(yu)(yu)濾(lv)(lv)波(bo)(bo)器(qi)漏(lou)電(dian)流(liu)(liu)的大小,涉及(ji)到人身安全,國際(ji)上各國對它都(dou)有嚴格的標準規定,對于(yu)(yu)(yu)是220V/50Hz交(jiao)流(liu)(liu)電(dian)網供電(dian)，一--般要求(qiu)噪聲濾(lv)(lv)波(bo)(bo)器(qi)的漏(lou)電(dian)流(liu)(liu)小于(yu)(yu)(yu)1mA

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