一直以來，果粉們都覺得(de)iPhone充(chong)電(dian)太麻(ma)煩(fan)，因為與其(qi)他(ta)手機(ji)(ji)的充(chong)電(dian)接(jie)口(kou)根本不通用(yong)。現(xian)在，市面上有很(hen)多帶iPhone充(chong)電(dian)轉接(jie)口(kou)的產(chan)品，據說連上其(qi)他(ta)手機(ji)(ji)的充(chong)電(dian)器(qi)，也能給iPhone充(chong)電(dian)。那么(me)，iPhone真(zhen)能用(yong)轉接(jie)口(kou)混用(yong)其(qi)他(ta)充(chong)電(dian)器(qi)嗎？充(chong)電(dian)又是(shi)否安(an)全呢？

　　《快報時間》買來了兩種轉接口，一種是蘋果公司官網推薦的專用充電轉接口，另一種是網購的通用充電連接線。我們把這兩種連接設備，分別接到4款不同品牌的手機充電器、3款非品牌充電器和iPhone專用充電器上，看它們能否正常(chang)給iPhone充(chong)電。

　　實驗一：測試蘋果公司官網推薦的專用充電轉接口，發現有兩款非品牌充電器無法正常給iPhone充電(dian)。檢測充電(dian)器連接手機前輸(shu)出(chu)的(de)空載電(dian)壓(ya)，這兩款充電(dian)器的(de)空載電(dian)壓(ya)分別(bie)是5.38伏、5.6伏，比其他六款都要高。

　　“iPhone在充電(dian)(dian)(dian)(dian)時有限(xian)壓保護(hu)措施，當手機連接充電(dian)(dian)(dian)(dian)器(qi)時，會(hui)先檢測空(kong)載電(dian)(dian)(dian)(dian)壓，超過限(xian)壓大小時，就(jiu)無法正常充電(dian)(dian)(dian)(dian)了。”中國(guo)計量學(xue)院機電(dian)(dian)(dian)(dian)工程學(xue)院蔡慧老(lao)師(shi)經測試得出(chu)結果當空(kong)載電(dian)(dian)(dian)(dian)壓高于5.47伏時，iPhone就(jiu)會(hui)停止充電(dian)(dian)(dian)(dian)。

　　可是(shi)，其中一款非品(pin)牌充(chong)電(dian)(dian)(dian)(dian)器(qi)的空載電(dian)(dian)(dian)(dian)壓只有5.38伏(fu)(fu)，為什么也(ye)不(bu)能正常充(chong)電(dian)(dian)(dian)(dian)呢？蔡慧老師說，萬用表測出(chu)來(lai)的是(shi)電(dian)(dian)(dian)(dian)壓平(ping)(ping)均(jun)值(zhi)，與(yu)實際(ji)輸出(chu)電(dian)(dian)(dian)(dian)壓不(bu)同，因(yin)為輸出(chu)電(dian)(dian)(dian)(dian)壓里(li)有紋波(bo)(bo)。紋波(bo)(bo)，簡單地(di)說就是(shi)電(dian)(dian)(dian)(dian)流里(li)有雜質，導致電(dian)(dian)(dian)(dian)壓忽(hu)高忽(hu)低。“雖然這款非品(pin)牌充(chong)電(dian)(dian)(dian)(dian)器(qi)的平(ping)(ping)均(jun)電(dian)(dian)(dian)(dian)壓是(shi)5.38伏(fu)(fu)，可電(dian)(dian)(dian)(dian)壓最高值(zhi)有5.63伏(fu)(fu)，波(bo)(bo)動(dong)很大，所(suo)以(yi)也(ye)會被iPhone限制無法充(chong)電(dian)(dian)(dian)(dian)。”

　　由此可(ke)見，并非所有(you)的(de)充(chong)(chong)(chong)電(dian)器接上轉(zhuan)接口(kou)，都能給iPhone充(chong)(chong)(chong)電(dian)。當充(chong)(chong)(chong)電(dian)器的(de)空載電(dian)壓超過(guo)5.47伏，或充(chong)(chong)(chong)電(dian)器輸出電(dian)壓有(you)雜質(zhi)、電(dian)壓不穩定時，iPhone就會啟動限壓保護措(cuo)施。

　　實驗二(er)：測(ce)試網購的通用充電(dian)(dian)連(lian)接線(xian)，發現(xian)所(suo)有的充電(dian)(dian)器，都(dou)能正常給iPhone充電(dian)(dian)。

　　蔡慧老師(shi)說，連接線中有(you)分壓(ya)電路，還有(you)一定(ding)的濾波功能，能夠過濾部分雜質，穩(wen)定(ding)電壓(ya)，但是(shi)(shi)因為無法確定(ding)到底過濾了多(duo)少雜質，電壓(ya)同樣會(hui)不穩(wen)定(ding)，所(suo)以還是(shi)(shi)不建(jian)議(yi)使(shi)用這種(zhong)通用的充電連接線。

　　除了(le)輸出電(dian)(dian)(dian)(dian)壓過大的(de)(de)兩(liang)款充(chong)電(dian)(dian)(dian)(dian)器，其他(ta)能給(gei)iPhone充(chong)電(dian)(dian)(dian)(dian)的(de)(de)充(chong)電(dian)(dian)(dian)(dian)器使用時都安全了(le)嗎？我們對充(chong)電(dian)(dian)(dian)(dian)器連接iPhone后的(de)(de)輸出電(dian)(dian)(dian)(dian)流(liu)進(jin)行(xing)了(le)測(ce)試，發現(xian)幾款充(chong)電(dian)(dian)(dian)(dian)器的(de)(de)輸出電(dian)(dian)(dian)(dian)流(liu)都在iPhone的(de)(de)安全范圍內，但某品牌(pai)充(chong)電(dian)(dian)(dian)(dian)器、非品牌(pai)充(chong)電(dian)(dian)(dian)(dian)器兩(liang)款額定電(dian)(dian)(dian)(dian)流(liu)只有iPhone專用充(chong)電(dian)(dian)(dian)(dian)器的(de)(de)一半。

　　“iPhone額定電流是1000毫安，可這些充電器的額定電流只有500毫安，充電器長期處在滿(man)載(zai)狀態，會縮短使(shi)用(yong)壽命，這樣(yang)的充電器我(wo)們不推薦使(shi)用(yong)。”