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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?
電動汽車充電樁中漏電流的原因
    1、半導體原件漏電流

    PN結(jie)在截上(shang)時流(liu)過(guo)的(de)很微小的(de)電(dian)流(liu)。D-S正向(xiang)偏置(zhi)(zhi),G-S反(fan)向(xiang)偏置(zhi)(zhi),導(dao)電(dian)溝道打開(kai)后,D到(dao)S才會有電(dian)流(liu)流(liu)過(guo)。但實際上(shang)由于自(zi)由電(dian)子的(de)存在,自(zi)由電(dian)子的(de)附著在SIO2和N+、導(dao)致D-S有漏電(dian)流(liu)。

    2、電源漏電流

    開(kai)關(guan)電(dian)源中為了減少干擾(rao),按照國標,必(bi)須設有(you)EMI濾波器電(dian)路(lu)(lu)。由于EMI電(dian)路(lu)(lu)的(de)關(guan)系,使得在(zai)開(kai)關(guan)電(dian)源在(zai)接上市(shi)電(dian)后對(dui)地有(you)一個微小的(de)電(dian)流(liu),這就是漏電(dian)流(liu)。如果不接地,計(ji)算機(ji)的(de)外殼(ke)會(hui)對(dui)地帶(dai)有(you)110伏電(dian)壓(ya),用手(shou)摸會(hui)有(you)麻(ma)的(de)感(gan)覺,同時對(dui)計(ji)算機(ji)工作也會(hui)造成影響。電(dian)動汽車充電(dian)樁

    3、電容漏電流

    電(dian)(dian)(dian)(dian)(dian)容(rong)介(jie)質不可(ke)能(neng)不導電(dian)(dian)(dian)(dian)(dian);當(dang)電(dian)(dian)(dian)(dian)(dian)容(rong)加上直流(liu)電(dian)(dian)(dian)(dian)(dian)壓(ya)時,電(dian)(dian)(dian)(dian)(dian)容(rong)器(qi)會有漏(lou)電(dian)(dian)(dian)(dian)(dian)流(liu)產生。若漏(lou)電(dian)(dian)(dian)(dian)(dian)流(liu)太大,電(dian)(dian)(dian)(dian)(dian)容(rong)器(qi)就會發熱損壞(huai)。除電(dian)(dian)(dian)(dian)(dian)解電(dian)(dian)(dian)(dian)(dian)容(rong)外,其(qi)(qi)(qi)他電(dian)(dian)(dian)(dian)(dian)容(rong)器(qi)的(de)漏(lou)電(dian)(dian)(dian)(dian)(dian)流(liu)是(shi)小的(de),故用絕緣(yuan)電(dian)(dian)(dian)(dian)(dian)阻參數來表示其(qi)(qi)(qi)絕緣(yuan)性能(neng),而電(dian)(dian)(dian)(dian)(dian)解電(dian)(dian)(dian)(dian)(dian)容(rong)因(yin)漏(lou)電(dian)(dian)(dian)(dian)(dian)較大,故用漏(lou)電(dian)(dian)(dian)(dian)(dian)流(liu)表示其(qi)(qi)(qi)絕緣(yuan)性能(neng)(與容(rong)量成正比(bi))。對電(dian)(dian)(dian)(dian)(dian)容(rong)器(qi)施加額定直流(liu)工作電(dian)(dian)(dian)(dian)(dian)壓(ya)將觀(guan)察到充電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)流(liu)的(de)變化開始很大,隨(sui)著(zhu)時間而下降,到某一終(zhong)值(zhi)時達到較穩(wen)定狀態這一終(zhong)值(zhi)電(dian)(dian)(dian)(dian)(dian)流(liu)稱為(wei)漏(lou)電(dian)(dian)(dian)(dian)(dian)流(liu)。i=kcu(ua);其(qi)(qi)(qi)中k值(zhi)為(wei)漏(lou)電(dian)(dian)(dian)(dian)(dian)流(liu)常數,單位為(wei)μa(v:μf)

    4、濾波(bo)器(qi)漏電(dian)流

    電(dian)(dian)(dian)源濾(lv)波器(qi)(qi)(qi)(qi)漏(lou)(lou)電(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)定(ding)義(yi)為:在額定(ding)交(jiao)流(liu)(liu)(liu)(liu)(liu)電(dian)(dian)(dian)壓下濾(lv)波器(qi)(qi)(qi)(qi)外殼(ke)到交(jiao)流(liu)(liu)(liu)(liu)(liu)進線(xian)任意端的(de)(de)電(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)。如果濾(lv)波器(qi)(qi)(qi)(qi)的(de)(de)所有端口與外殼(ke)之間是(shi)完全絕緣(yuan)的(de)(de),則漏(lou)(lou)電(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)的(de)(de)值主(zhu)要取決于(yu)共(gong)模電(dian)(dian)(dian)容CY的(de)(de)漏(lou)(lou)電(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu),即(ji)主(zhu)要取決于(yu)CY的(de)(de)容量。由(you)于(yu)濾(lv)波器(qi)(qi)(qi)(qi)漏(lou)(lou)電(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)的(de)(de)大小,涉及到人身安全,國際上(shang)各國對它都有嚴格的(de)(de)標準規定(ding),對于(yu)是(shi)220V/50Hz交(jiao)流(liu)(liu)(liu)(liu)(liu)電(dian)(dian)(dian)網供電(dian)(dian)(dian),一--般(ban)要求噪聲(sheng)濾(lv)波器(qi)(qi)(qi)(qi)的(de)(de)漏(lou)(lou)電(dian)(dian)(dian)流(liu)(liu)(liu)(liu)(liu)小于(yu)1mA
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