2017年(nian)蘋果推出的三款手(shou)機(ji)Iphone8/8plus/X支持(chi)無(wu)(wu)線(xian)充(chong)電(dian)(dian)(dian)(dian)以(yi)后(hou)(hou)，一(yi)直以(yi)來都半(ban)溫不火的無(wu)(wu)線(xian)充(chong)電(dian)(dian)(dian)(dian)市(shi)場算(suan)是(shi)徹底(di)火了起來，無(wu)(wu)線(xian)充(chong)電(dian)(dian)(dian)(dian)器市(shi)場一(yi)片繁榮，許多后(hou)(hou)進(jin)的手(shou)機(ji)也都加入了無(wu)(wu)線(xian)充(chong)電(dian)(dian)(dian)(dian)功能，一(yi)時間(jian)市(shi)場上(shang)都是(shi)采(cai)用玻(bo)璃(li)后(hou)(hou)蓋(gai)的手(shou)機(ji)。雖然無(wu)(wu)線(xian)充(chong)電(dian)(dian)(dian)(dian)的便利性受到(dao)了一(yi)些質疑(yi)，但是(shi)這(zhe)種特(te)殊的充(chong)電(dian)(dian)(dian)(dian)方式確實(shi)與傳統(tong)的電(dian)(dian)(dian)(dian)源適配器不同(tong)，也吸引到(dao)了一(yi)些用戶，那么(me)為什么(me)它不需(xu)要(yao)插電(dian)(dian)(dian)(dian)就可(ke)以(yi)充(chong)電(dian)(dian)(dian)(dian)呢(ni)？電源(yuan)適配器廠(chang)家(jia)今(jin)天就來為大家(jia)揭秘(mi)一下他的工作原(yuan)理。

無(wu)線充電(dian)(dian)(dian)(dian)(dian)系(xi)統主要采用(yong)(yong)電(dian)(dian)(dian)(dian)(dian)磁(ci)感(gan)應原理，通(tong)過(guo)(guo)線圈進行(xing)能量耦(ou)合(he)(he)實現(xian)能量的傳(chuan)遞。如(ru)圖所(suo)示，系(xi)統工作時輸(shu)入端將(jiang)交流(liu)(liu)市(shi)電(dian)(dian)(dian)(dian)(dian)經全(quan)橋整(zheng)流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)路變(bian)(bian)換成(cheng)直(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)，或用(yong)(yong)24V直(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)端直(zhi)接為(wei)系(xi)統供電(dian)(dian)(dian)(dian)(dian)。經過(guo)(guo)電(dian)(dian)(dian)(dian)(dian)源管(guan)理模塊后輸(shu)出的直(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)通(tong)過(guo)(guo)2M有源晶(jing)振逆變(bian)(bian)轉換成(cheng)高頻交流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)供給初(chu)級繞組。通(tong)過(guo)(guo)2個電(dian)(dian)(dian)(dian)(dian)感(gan)線圈耦(ou)合(he)(he)能量，次級線圈輸(shu)出的電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)經接受(shou)轉換電(dian)(dian)(dian)(dian)(dian)路變(bian)(bian)化成(cheng)直(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)為(wei)電(dian)(dian)(dian)(dian)(dian)池充電(dian)(dian)(dian)(dian)(dian)。

變(bian)(bian)(bian)化(hua)(hua)(hua)(hua)的(de)(de)(de)磁(ci)場(chang)會(hui)產(chan)生變(bian)(bian)(bian)化(hua)(hua)(hua)(hua)的(de)(de)(de)電(dian)(dian)場(chang)，變(bian)(bian)(bian)化(hua)(hua)(hua)(hua)的(de)(de)(de)電(dian)(dian)場(chang)會(hui)產(chan)生變(bian)(bian)(bian)化(hua)(hua)(hua)(hua)的(de)(de)(de)磁(ci)場(chang)，其大小均與它們的(de)(de)(de)變(bian)(bian)(bian)化(hua)(hua)(hua)(hua)率有關(guan)系，而正(zheng)弦函(han)數(shu)的(de)(de)(de)變(bian)(bian)(bian)化(hua)(hua)(hua)(hua)率是(shi)另外一個正(zheng)弦函(han)數(shu)，所以電(dian)(dian)磁(ci)波能夠傳(chuan)播出去，而感應(ying)電(dian)(dian)壓的(de)(de)(de)產(chan)生與磁(ci)通量的(de)(de)(de)變(bian)(bian)(bian)化(hua)(hua)(hua)(hua)相(xiang)關(guan)，所以線圈內部變(bian)(bian)(bian)化(hua)(hua)(hua)(hua)的(de)(de)(de)磁(ci)場(chang)產(chan)生感應(ying)電(dian)(dian)壓，從而完成充電(dian)(dian)過程。

手(shou)機無線(xian)充(chong)(chong)是比(bi)較(jiao)新穎(ying)的(de)(de)(de)(de)充(chong)(chong)電(dian)方式，其原(yuan)理其實(shi)很簡單，就是將普通的(de)(de)(de)(de)變壓器(qi)主次級(ji)分開來達到無線(xian)的(de)(de)(de)(de)目的(de)(de)(de)(de)。當然，無線(xian)充(chong)(chong)的(de)(de)(de)(de)工作(zuo)(zuo)頻(pin)率比(bi)較(jiao)高(gao)，甚至可(ke)(ke)以拋棄鐵心直接線(xian)圈之(zhi)間就可(ke)(ke)以達到能量傳遞的(de)(de)(de)(de)作(zuo)(zuo)用。雖然這種充(chong)(chong)電(dian)方式很有趣，但(dan)是目前的(de)(de)(de)(de)無線(xian)充(chong)(chong)還(huan)是一種未完全(quan)成熟的(de)(de)(de)(de)產品。首先它受(shou)制與(yu)空間的(de)(de)(de)(de)限制（手(shou)機必須(xu)非常貼近充(chong)(chong)電(dian)器(qi)，才可(ke)(ke)以充(chong)(chong)電(dian)）；它的(de)(de)(de)(de)充(chong)(chong)電(dian)速(su)度較(jiao)慢，與(yu)現在(zai)流(liu)行(xing)的(de)(de)(de)(de)快充(chong)(chong)相(xiang)比(bi)，無線(xian)充(chong)(chong)的(de)(de)(de)(de)速(su)度通常只有7.5W，遠遠無法滿足人們(men)的(de)(de)(de)(de)需(xu)求；另(ling)外價格成本較(jiao)高(gao)與(yu)充(chong)(chong)電(dian)效率較(jiao)低，也是一個問題。所以電(dian)源適配器(qi)廠(chang)家(jia)認為(wei)真正(zheng)的(de)(de)(de)(de)無線(xian)充(chong)(chong)電(dian)時代是值得期(qi)待的(de)(de)(de)(de)，但(dan)是現在(zai)我(wo)們(men)還(huan)差的(de)(de)(de)(de)很遠。