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蘋果充電器是否能混用及使用說明

iPad充電器給(gei)iPhone充(chong)電:安(an)全

iPhone充(chong)電(dian)器給(gei)iPad充(chong)電(dian):難說

iPhone充(chong)電(dian)器給iPhone充(chong)電(dian)(完全(quan)放(fang)電(dian))

iPad充(chong)電(dian)(dian)器給iPhone4s充(chong)電(dian)(dian)(完全(quan)放電(dian)(dian))

在蘋果官網的技術支持區里(li)有這樣(yang)一段說明:iPad USB電源(yuan)適(shi)配(pei)器(qi)(qi)是一個10W的充電器(qi)(qi)。雖(sui)然此iPad 10W USB電源(yuan)適(shi)配(pei)器(qi)(qi)設(she)計為供iPad使用,但(dan)是您仍可(ke)通過其對所有iPhone和iPod機型(xing)充電。

但(dan)對 “果(guo)粉”來(lai)說,有條微(wei)博(bo)讓(rang)人很(hen)糾(jiu)結:請不要用(yong)(yong)iPad的充(chong)(chong)電(dian)器為iPhone充(chong)(chong)電(dian),雖然它(ta)們看起來(lai)長得一樣,兩者的充(chong)(chong)電(dian)電(dian)壓(ya)也都(dou)是(shi)5V,但(dan)是(shi)iPhone充(chong)(chong)電(dian)的額(e)定電(dian)流是(shi)1A,而(er)iPad卻是(shi)2.1A……混用(yong)(yong)充(chong)(chong)電(dian)器的后果(guo)是(shi)既(ji)傷iPhone又(you)傷iPad充(chong)(chong)電(dian)器”。

iPad和(he)iPhone充電器到底能(neng)不能(neng)混(hun)用?口說無(wu)憑,實驗為證,《好奇實驗室》為你(ni)實測。

實(shi)驗(yan)對象:兩臺(tai)iPad、一(yi)臺(tai)iPad2、一(yi)臺(tai)iPhone4、一(yi)臺(tai)iPhone4s

中國(guo)計量學院機電(dian)(dian)(dian)工程學院的(de)蔡慧(hui)老師說,iPad充(chong)電(dian)(dian)(dian)器(qi)的(de)功率(lv)(lv)10W,是指電(dian)(dian)(dian)源的(de)最大輸出(chu)功率(lv)(lv),但(dan)實際輸出(chu)功率(lv)(lv)要(yao)取決于(yu)所(suo)接(jie)的(de)負載;iPad和iPhone的(de)充(chong)電(dian)(dian)(dian)器(qi)的(de)額定電(dian)(dian)(dian)壓(ya)都是5V,只要(yao)實際電(dian)(dian)(dian)流(liu)不(bu)超(chao)過額定電(dian)(dian)(dian)流(liu)(即iPhone1A,iPad2.1A),也不(bu)會對充(chong)電(dian)(dian)(dian)設備造成傷(shang)害(hai)。

iPad和(he)(he)iPhone的(de)充電(dian)(dian)器連(lian)(lian)(lian)接(jie)線(xian)都是一樣的(de),我(wo)們把它剪斷,里面有紅黑白(bai)(bai)綠四條(tiao)線(xian),經檢(jian)測(ce),紅線(xian)是電(dian)(dian)源線(xian),黑線(xian)是地線(xian),當連(lian)(lian)(lian)接(jie)線(xian)和(he)(he)iPad充電(dian)(dian)器相連(lian)(lian)(lian)時,在白(bai)(bai)線(xian)和(he)(he)綠線(xian)上分別(bie)檢(jian)測(ce)到了2V和(he)(he)2.7V電(dian)(dian)壓,而當連(lian)(lian)(lian)接(jie)線(xian)和(he)(he)iPhone充電(dian)(dian)器連(lian)(lian)(lian)接(jie)時,白(bai)(bai)、綠兩條(tiao)線(xian)上沒(mei)有測(ce)到電(dian)(dian)壓。

“白、綠兩條(tiao)線(xian)是信號線(xian),當iPad或iPhone接上充電(dian)器時(shi),通過這兩條(tiao)線(xian)可以區分當前使用的(de)是哪(na)種充電(dian)器,能對負載(zai)做出相應的(de)調整。”蔡慧老師(shi)說。

我們先(xian)用萬能表對各種(zhong)充電(dian)方(fang)式(shi)進行檢(jian)測。

iPad充(chong)電器(單(dan)位:A) iPhone充(chong)電器(單(dan)位:A)

50%電(dian)量(liang)的(de)iPadA 1.5 0.48

60%電量的iPadB 1.5 1.26

70%電量的iPad2 1.4 0.48

39%電(dian)量的iPhone4 0.98 0.45

40%電量的iPhone4s 0.88 0.9

從檢測(ce)結果看,iPad充(chong)電(dian)(dian)器給iPhone充(chong)電(dian)(dian)時(shi)(shi),實(shi)際電(dian)(dian)流都(dou)低于1A,而用iPhone充(chong)電(dian)(dian)器給iPad充(chong)電(dian)(dian)時(shi)(shi),iPadA和iPad2顯示(shi)“沒有充(chong)電(dian)(dian)”,顯示(shi)“正在充(chong)電(dian)(dian)”字樣的iPadB的實(shi)際電(dian)(dian)流偏大,超過了1A。

“iPadB里的一些系統(tong)軟件可能(neng)被更(geng)改了(le),導致這樣(yang)的問題(ti)出(chu)現,用iPhone充(chong)(chong)電器充(chong)(chong)電時,iPad是不會有損(sun)傷的,因為電流小于額定電流,但對充(chong)(chong)電器會有損(sun)傷,時間一長,充(chong)(chong)電器就會壞掉。”

我們注意到,不同(tong)電(dian)(dian)(dian)量的(de)(de)設(she)備(bei),充電(dian)(dian)(dian)的(de)(de)實際電(dian)(dian)(dian)流大小也是不一樣的(de)(de),蔡(cai)老師解釋(shi)說(shuo),這(zhe)是因為智能電(dian)(dian)(dian)池在充電(dian)(dian)(dian)過程中,為了保持電(dian)(dian)(dian)池不受傷害,所(suo)以電(dian)(dian)(dian)流的(de)(de)大小是會發生改(gai)變的(de)(de)。

為更(geng)詳(xiang)細(xi)地了解整(zheng)個充電(dian)過程,我們決(jue)定把iPad和(he)iPhone完(wan)全放(fang)電(dian)到(dao)0%后,再進行充電(dian),并(bing)用萬能表(biao)連(lian)接電(dian)腦來記錄整(zheng)個充電(dian)過程――由于時(shi)間關系,我們選擇了iPad2和(he)iPhoe4s來進行實驗。

時(shi)間 實際(ji)電流(單位:A)

iPhone4s充電器充iPhone4s 約(yue)4小(xiao)時 0.8以下

iPhone4s充電器充iPad2 約14小時(shi) 0.5以下

iPad2充(chong)電器充(chong)iPhone4s 約3小時 0.83以下

iPad2充(chong)電器充(chong)iPad2 約9小時 1以下

從(cong)檢(jian)測結果(guo)看,iPad充(chong)電(dian)(dian)器給(gei)(gei)iPhone4s充(chong)電(dian)(dian)時,電(dian)(dian)流(liu)一(yi)直都在額(e)定電(dian)(dian)流(liu)以下,比用iPhone充(chong)電(dian)(dian)器充(chong)電(dian)(dian)的電(dian)(dian)流(liu)稍大,速(su)度也稍快一(yi)些;用iPhone充(chong)電(dian)(dian)器給(gei)(gei)iPad充(chong)電(dian)(dian)時,雖然iPad上沒(mei)有顯示充(chong)電(dian)(dian),但實際上一(yi)直在充(chong)電(dian)(dian),只是需要的時間(jian)相當(dang)長。

但不管哪種方式充(chong)電(dian)(dian),整(zheng)個充(chong)電(dian)(dian)過程中的電(dian)(dian)流(liu)都是(shi)先低后(hou)高,然后(hou)慢(man)(man)慢(man)(man)下降(jiang),當電(dian)(dian)量到90%左(zuo)右時,電(dian)(dian)流(liu)會(hui)越來越小。

“如果開始充(chong)電(dian)時電(dian)池電(dian)量(liang)很低,那么必須用小(xiao)電(dian)流(liu)開始充(chong)電(dian),小(xiao)電(dian)流(liu)充(chong)電(dian)是(shi)為(wei)了保護電(dian)池,避免大電(dian)流(liu)沖擊給電(dian)池內部(bu)結構帶來損害;而當電(dian)池電(dian)壓達(da)到或接(jie)近充(chong)滿電(dian)壓時,則(ze)要開始轉入恒壓充(chong)電(dian),如果不(bu)轉入小(xiao)電(dian)流(liu)充(chong)電(dian),就可(ke)能(neng)導(dao)致電(dian)壓過高,有(you)過充(chong)的危險,也是(shi)對電(dian)池有(you)害的。”蔡老師說。

但即使是用(yong)iPad充電器給iPad充電,實際電流也沒有大于1A,這是為什么呢?

蔡老(lao)師說,iPad和(he)iPhone會根據電(dian)池的(de)余(yu)量來選擇充(chong)電(dian)方案,當電(dian)池完(wan)全耗(hao)光時(shi)(shi),就相當于一(yi)(yi)個餓了很長(chang)時(shi)(shi)間(jian)(jian)的(de)人,不(bu)能一(yi)(yi)下(xia)子進食太多,而應該一(yi)(yi)點一(yi)(yi)點慢(man)慢(man)吃,所以完(wan)全放電(dian)后(hou)充(chong)電(dian),比有(you)余(yu)電(dian)時(shi)(shi)充(chong)電(dian)的(de)電(dian)量更小一(yi)(yi)些,時(shi)(shi)間(jian)(jian)也更長(chang)一(yi)(yi)些。

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