AC/DC開關(guan)電(dian)源適配(pei)器(qi)芯片（或(huo)稱模塊(kuai)），只要配(pei)合一些(xie)阻(zu)容元件和一個(ge)開關(guan)變壓器(qi)，就可以做成一個(ge)基本(ben)的開關(guan)電(dian)源適配(pei)器(qi)。
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不知道(dao)你是(shi)(shi)(shi)否和我一(yi)樣(yang)(yang)，經常混用充(chong)電(dian)(dian)器，但(dan)是(shi)(shi)(shi)之(zhi)前在網上我聽到一(yi)種說法：不能(neng)使用Ipad充(chong)電(dian)(dian)器給(gei)iphone充(chong)電(dian)(dian)，雖然兩種充(chong)電(dian)(dian)線長得一(yi)樣(yang)(yang)，電(dian)(dian)壓都是(shi)(shi)(shi)5V，但(dan)iPhone的充(chong)電(dian)(dian)電(dian)(dian)流(liu)是(shi)(shi)(shi)1A，而(er)iPad卻(que)是(shi)(shi)(shi)2.1A，根據P=UI可得iPhone充(chong)電(dian)(dian)器的功率為(wei)5W，而(er)iPad為(wei)10.2W。這樣(yang)(yang)做的后果是(shi)(shi)(shi)既傷iPhone又傷iPad充(chong)電(dian)(dian)器（過(guo)高(gao)電(dian)(dian)流(liu)有可能(neng)導致(zhi)關鍵電(dian)(dian)容(rong)擊(ji)穿！）...
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充電(dian)(dian)(dian)(dian)器插(cha)頭一(yi)端插(cha)在220V交(jiao)流(liu)電(dian)(dian)(dian)(dian)的(de)插(cha)座(zuo)上，另一(yi)端用蘋(pin)果(guo)專(zhuan)用的(de)數據線(xian)接到(dao)iPhone/iPad上。220V交(jiao)流(liu)電(dian)(dian)(dian)(dian)先通(tong)過(guo)(guo)整流(liu)電(dian)(dian)(dian)(dian)路變(bian)成(cheng)高壓(ya)(ya)(ya)(ya)直(zhi)流(liu)電(dian)(dian)(dian)(dian)，再經(jing)過(guo)(guo)開關(guan)管變(bian)成(cheng)高頻高壓(ya)(ya)(ya)(ya)脈(mo)(mo)沖，然(ran)后通(tong)過(guo)(guo)變(bian)壓(ya)(ya)(ya)(ya)器轉(zhuan)換(huan)為低壓(ya)(ya)(ya)(ya)（比如5V）脈(mo)(mo)沖。5V的(de)低壓(ya)(ya)(ya)(ya)脈(mo)(mo)沖再經(jing)過(guo)(guo)一(yi)個整流(liu)、穩壓(ya)(ya)(ya)(ya)電(dian)(dian)(dian)(dian)路，變(bian)成(cheng)5V穩定的(de)直(zhi)流(liu)電(dian)(dian)(dian)(dian)。在從220V交(jiao)流(liu)電(dian)(dian)(dian)(dian)變(bian)為5V直(zhi)流(liu)電(dian)(dian)(dian)(dian)的(de)整個過(guo)(guo)程(cheng)中，變(bian)壓(ya)(ya)(ya)(ya)器、整流(liu)電(dian)(dian)(dian)(dian)路、穩壓(ya)(ya)(ya)(ya)電(dian)(dian)(dian)(dian)路只是(shi)起(qi)到(dao)一(yi)個改(gai)...
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共(gong)享(xiang)(xiang)充(chong)(chong)電線大(da)家現在肯(ken)定已(yi)經都不陌生(sheng)了(le)，作(zuo)為共(gong)享(xiang)(xiang)充(chong)(chong)電寶的(de)孿生(sheng)兄弟，共(gong)享(xiang)(xiang)充(chong)(chong)電線在酒(jiu)店網吧等場景(jing)(jing)也是大(da)行(xing)其道(dao)！占(zhan)領了(le)各種(zhong)精準的(de)酒(jiu)店場景(jing)(jing)和網吧場景(jing)(jing)！為什(shen)么在共(gong)享(xiang)(xiang)充(chong)(chong)電寶已(yi)經鋪滿整個市(shi)場以后，作(zuo)為后出(chu)的(de)共(gong)享(xiang)(xiang)充(chong)(chong)電線依(yi)然可(ke)以走出(chu)自己的(de)道(dao)路呢？
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記得(de)在共(gong)享充電(dian)寶(bao)剛剛推出市(shi)(shi)場的時候，有人就說我每天出門都自帶充電(dian)寶(bao)，怎么(me)會(hui)花錢去租借(jie)你的充電(dian)寶(bao)嘛，但是如今共(gong)享充電(dian)寶(bao)的市(shi)(shi)場你可以看看，做得(de)比較早的代(dai)理商(shang)早就賺得(de)盆滿缽滿。
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在(zai)學電(dian)源(yuan)適配器電(dian)路中，要(yao)學會分析電(dian)路，就(jiu)從了解電(dian)路的(de)三(san)種狀(zhuang)態開(kai)始。電(dian)路有哪三(san)種狀(zhuang)態：通路(負載(zai))、短(duan)路、開(kai)路(空載(zai))三(san)種狀(zhuang)態下的(de)電(dian)源(yuan)適配器電(dian)壓(ya)分別是(shi) U=E-IR， U=0。U=E，以下內容分別介紹這三(san)種狀(zhuang)態的(de)具體情況。
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