便(bian)攜式電(dian)源的(de)應用范(fan)圍(wei)很廣，也很多(duo)(duo)(duo)樣(yang)化。產品包括消耗uW級平均功(gong)率的(de)無線傳感器節點以(yi)及可用小車推著的(de)、電(dian)池組(zu)耗電(dian)數百瓦(wa)-時的(de)醫療(liao)或(huo)數據采集(ji)系統。不過，盡管應用種(zhong)類很多(duo)(duo)(duo)，仍然出現了幾(ji)個(ge)趨勢(shi)，設計師日益需(xu)要給產品提(ti)供更(geng)大(da)的(de)功(gong)率，以(yi)支(zhi)持(chi)不斷(duan)增多(duo)(duo)(duo)的(de)功(gong)能，同(tong)時也在(zai)考慮(lv)怎樣(yang)用任何(he)可用電(dian)源給電(dian)池充電(dian)。要滿(man)足第一種(zhong)需(xu)求，就要提(ti)高電(dian)池容量。不幸的(de)是(shi)，用戶大(da)多(duo)(duo)(duo)比較心急，容量提(ti)高以(yi)后，還必須(xu)在(zai)一個(ge)合理(li)的(de)時間內充滿(man)電(dian)，這(zhe)就導致要增大(da)充電(dian)電(dian)流。要滿(man)足第二種(zhong)需(xu)求，就要求電(dian)池充電(dian)解決方(fang)案提(ti)供極(ji)大(da)的(de)靈(ling)活(huo)性。本文將更(geng)詳細地討論這(zhe)些(xie)問題(ti)。

　　更大的功率

　　考慮一(yi)下(xia)新式(shi)(shi)手(shou)持(chi)(chi)式(shi)(shi)設(she)備(bei)(bei)(bei)(bei)，面向消(xiao)費者的(de)(de)設(she)備(bei)(bei)(bei)(bei)和(he)工業(ye)設(she)備(bei)(bei)(bei)(bei)都可能包括蜂窩電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)話調制解調器(qi)、Wi-Fi模(mo)塊、藍(lan)牙模(mo)塊、大尺寸(cun)背(bei)光照明(ming)顯(xian)示屏(ping)…等(deng)等(deng)。很多手(shou)持(chi)(chi)式(shi)(shi)設(she)備(bei)(bei)(bei)(bei)的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)架構(gou)都與蜂窩電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)話的(de)(de)非常(chang)(chang)相似。一(yi)般情況下(xia)，用(yong)一(yi)個3.7V的(de)(de)鋰(li)離(li)子(zi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)作為(wei)(wei)主電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)，因(yin)為(wei)(wei)鋰(li)離(li)子(zi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)按重量和(he)按體積(ji)的(de)(de)能量密度都很高(單位分別為(wei)(wei)Wh/kg和(he)Wh/m3)。過(guo)去，很多大功率設(she)備(bei)(bei)(bei)(bei)都采用(yong)7.4V鋰(li)離(li)子(zi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)，以降低電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流要求，不(bu)過(guo)低價5V電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)管(guan)理IC的(de)(de)上市已經促使越(yue)來越(yue)多的(de)(de)手(shou)持(chi)(chi)式(shi)(shi)設(she)備(bei)(bei)(bei)(bei)采用(yong)了(le)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓更低的(de)(de)架構(gou)。平板電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)腦很好地說明(ming)了(le)這(zhe)(zhe)一(yi)點(dian)：一(yi)個典型的(de)(de)平板電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)腦有極(ji)多的(de)(de)功能以及非常(chang)(chang)大的(de)(de)顯(xian)示屏(ping)(就(jiu)便攜(xie)式(shi)(shi)設(she)備(bei)(bei)(bei)(bei)而言(yan))。用(yong)3.7V電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)供電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)時，其(qi)容量必(bi)須(xu)以數千毫安-小時計算。為(wei)(wei)了(le)在(zai)幾個小時內給這(zhe)(zhe)樣一(yi)個電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)充滿電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)，需要數千mA的(de)(de)充電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流。

　　然(ran)而(er)，如果沒有(you)大電(dian)(dian)(dian)(dian)流(liu)交(jiao)流(liu)適(shi)配(pei)器(qi)(qi)(qi)(qi)(qi)，盡管(guan)充電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流(liu)這(zhe)么高(gao)，也不能防止消費者(zhe)用(yong)USB端口給大功率(lv)設備充電(dian)(dian)(dian)(dian)的想法。為了(le)滿足這(zhe)種需求，當交(jiao)流(liu)適(shi)配(pei)器(qi)(qi)(qi)(qi)(qi)可(ke)用(yong)時(shi)，電(dian)(dian)(dian)(dian)池(chi)充電(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)(qi)必須能以大電(dian)(dian)(dian)(dian)流(liu)(>2A)充電(dian)(dian)(dian)(dian)，而(er)在(zai)沒有(you)交(jiao)流(liu)適(shi)配(pei)器(qi)(qi)(qi)(qi)(qi)可(ke)用(yong)時(shi)，電(dian)(dian)(dian)(dian)池(chi)充電(dian)(dian)(dian)(dian)器(qi)(qi)(qi)(qi)(qi)必須仍能高(gao)效地利用(yong)USB端口提(ti)供2.5W至4.5W功率(lv)。此外，器(qi)(qi)(qi)(qi)(qi)件必須保護敏感的下游低(di)壓(ya)組(zu)件免(mian)受可(ke)能出現過壓(ya)情況所導致的損(sun)壞(huai)，同時(shi)必須無(wu)縫地將大電(dian)(dian)(dian)(dian)流(liu)從USB輸入、交(jiao)流(liu)適(shi)配(pei)器(qi)(qi)(qi)(qi)(qi)或電(dian)(dian)(dian)(dian)池(chi)傳送(song)到負載(zai)，并最大限度地降低(di)功耗(hao)。另外，該IC還必須安(an)全地管(guan)理電(dian)(dian)(dian)(dian)池(chi)充電(dian)(dian)(dian)(dian)算法，并監視(shi)關(guan)鍵(jian)的系統參數。

　　戰勝單節電池供電的便攜式產品在功率方(fang)面的挑(tiao)戰

　　盡管看似不可能找到(dao)能滿足(zu)上述(shu)要求的單(dan)個(ge)IC，不過看一(yi)下LTC4155，這是一(yi)個(ge)大功率、I2C控制的高(gao)(gao)效率電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)通路(PowerPath?)管理(li)器(qi)、理(li)想二極管控制器(qi)和(he)(he)鋰離子電(dian)(dian)(dian)(dian)(dian)池(chi)充(chong)電(dian)(dian)(dian)(dian)(dian)器(qi)。該IC用來(lai)從(cong)(cong)各種5V電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)高(gao)(gao)效地傳(chuan)送高(gao)(gao)達3A的電(dian)(dian)(dian)(dian)(dian)流，可產生超過3.5A的可用電(dian)(dian)(dian)(dian)(dian)流，以供電(dian)(dian)(dian)(dian)(dian)池(chi)充(chong)電(dian)(dian)(dian)(dian)(dian)和(he)(he)系(xi)統使用(參見圖1)。LTC4155的效率為88%至94%，因此即使電(dian)(dian)(dian)(dian)(dian)流值這么大，該IC仍然(ran)可以減輕熱量(liang)預算(suan)限制(參見圖2)。LTC4155的開關式電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)通路拓撲無縫地管理(li)從(cong)(cong)兩種輸(shu)入電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(例如一(yi)個(ge)交流適(shi)配器(qi)和(he)(he)一(yi)個(ge)USB端口(kou))到(dao)設備中可再充(chong)電(dian)(dian)(dian)(dian)(dian)鋰離子電(dian)(dian)(dian)(dian)(dian)池(chi)的配電(dian)(dian)(dian)(dian)(dian)，同時當(dang)輸(shu)入功率有限時，優先為系(xi)統負載供電(dian)(dian)(dian)(dian)(dian)。

圖1：LTC4155的典(dian)型應用電(dian)路

圖2：LTC4155的典型效率

　　與典(dian)型(xing)的(de)(de)線性模式充(chong)電(dian)(dian)(dian)(dian)器(qi)(qi)(qi)相比，LTC4155中開關(guan)穩壓器(qi)(qi)(qi)的(de)(de)作(zuo)用就像一個變壓器(qi)(qi)(qi)，允許(xu)VOUT上的(de)(de)負載電(dian)(dian)(dian)(dian)流(liu)(liu)超過輸入電(dian)(dian)(dian)(dian)源(yuan)吸取的(de)(de)電(dian)(dian)(dian)(dian)流(liu)(liu)，并極大地提(ti)高電(dian)(dian)(dian)(dian)池(chi)充(chong)電(dian)(dian)(dian)(dian)的(de)(de)可用功率。前述(shu)例子(zi)說(shuo)明了LTC4155怎(zen)樣才能以(yi)高達3.5A的(de)(de)電(dian)(dian)(dian)(dian)流(liu)(liu)高效率地充(chong)電(dian)(dian)(dian)(dian)，以(yi)實現更快的(de)(de)充(chong)電(dian)(dian)(dian)(dian)時間。與普(pu)通的(de)(de)開關(guan)型(xing)電(dian)(dian)(dian)(dian)池(chi)充(chong)電(dian)(dian)(dian)(dian)器(qi)(qi)(qi)不同，LTC4155可即(ji)(ji)時接通工(gong)作(zuo)，以(yi)確保即(ji)(ji)使電(dian)(dian)(dian)(dian)池(chi)沒電(dian)(dian)(dian)(dian)或已深(shen)度放電(dian)(dian)(dian)(dian)，當一插上電(dian)(dian)(dian)(dian)源(yuan)插頭，系統電(dian)(dian)(dian)(dian)源(yuan)也立即(ji)(ji)可用。

　　盡管(guan)是(shi)以很高(gao)的速率給電(dian)池(chi)(chi)充(chong)電(dian)，監視(shi)電(dian)池(chi)(chi)是(shi)否安全也是(shi)很重(zhong)要的。當電(dian)池(chi)(chi)溫(wen)度降(jiang)至低于(yu)0°C或升至高(gao)于(yu)40°C[由一(yi)個(ge)外部負溫(wen)度系數(NTC)熱敏電(dian)阻測量]時，LTC4155將自動停止充(chong)電(dian)。除了這種自主式功(gong)能，LTC4155還提(ti)供(gong)一(yi)個(ge)7位擴(kuo)展標度模數轉換器(qi)(ADC)，以大約(yue)1°C的分辨(bian)率監視(shi)電(dian)池(chi)(chi)溫(wen)度(參見圖3)。結合4個(ge)可用的浮(fu)置電(dian)壓設定(ding)值和15個(ge)電(dian)池(chi)(chi)充(chong)電(dian)電(dian)流設定(ding)值，該ADC可基(ji)于(yu)電(dian)池(chi)(chi)溫(wen)度來建立定(ding)制的充(chong)電(dian)算法。

圖3：7位熱敏電(dian)阻器ADC顯(xian)示LTC4155的(de)預置溫度跳變(bian)點

　　通過一個簡單的兩線I2C端口可獲得NTCADC的結果，從而能調節充電電流和電壓的設定值。該I2C端口通過控制16個輸入電流的設定值(包括USB2.0和3.0兼容設置)，還可提供USB兼容性。該通信總線允許LTC4155指示額外的狀態信息，例如輸入電源狀態、充電器狀(zhuang)態和故(gu)障狀(zhuang)態。由于支持USBOTG，因此無需任何(he)額外的(de)組件，就可以反過來向(xiang)USB端(duan)口提供5V電源。

　　LTC4155的(de)(de)雙(shuang)路輸(shu)入(ru)(ru)(ru)、優(you)(you)先(xian)級多路復用(yong)(yong)器(qi)可根據用(yong)(yong)戶定(ding)義的(de)(de)優(you)(you)先(xian)級(默認的(de)(de)優(you)(you)先(xian)級為適配器(qi)輸(shu)入(ru)(ru)(ru))自主地選擇最合(he)適的(de)(de)輸(shu)入(ru)(ru)(ru)(即墻上適配器(qi)或(huo)USB)。過(guo)壓(ya)(ya)保(bao)(bao)護(hu)(OVP)電路同時保(bao)(bao)護(hu)兩個輸(shu)入(ru)(ru)(ru)，以免(mian)這(zhe)些輸(shu)入(ru)(ru)(ru)因無意間加上的(de)(de)高壓(ya)(ya)或(huo)反向電壓(ya)(ya)而損壞(huai)。LTC4155的(de)(de)理想二極(ji)管控(kong)制(zhi)器(qi)保(bao)(bao)證即使輸(shu)入(ru)(ru)(ru)功(gong)率不足或(huo)未提供輸(shu)入(ru)(ru)(ru)功(gong)率時，也(ye)始終(zhong)可向VOUT提供足夠的(de)(de)功(gong)率。

　　就平(ping)板電(dian)腦、工業條碼掃描器等很(hen)多便攜式應用而言，能(neng)管理(li)兩個輸入(ru)(例(li)如USB和(he)交流適配器)就足(zu)夠了。不過，便攜式設(she)備的(de)設(she)計師一(yi)直在尋求(qiu)用任何可用電(dian)源(yuan)都能(neng)給電(dian)池充電(dian)的(de)方法

　　多種輸入源

　　用戶要用多種輸入(ru)(ru)源(yuan)給電(dian)(dian)(dian)(dian)(dian)(dian)池充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)有(you)(you)幾個原因。有(you)(you)些應用也許需要擺(bai)脫電(dian)(dian)(dian)(dian)(dian)(dian)網的(de)(de)(de)(de)束縛，而靠太陽能電(dian)(dian)(dian)(dian)(dian)(dian)池板供電(dian)(dian)(dian)(dian)(dian)(dian)。另一(yi)些應用則可(ke)能要求能方便地用交流適配器(qi)、汽(qi)車電(dian)(dian)(dian)(dian)(dian)(dian)池或(huo)高壓(ya)工業及電(dian)(dian)(dian)(dian)(dian)(dian)信(xin)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)。無論出于(yu)何種原因，這要求都給電(dian)(dian)(dian)(dian)(dian)(dian)池充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)系(xi)統(tong)增加了極大的(de)(de)(de)(de)負(fu)擔(dan)。大多數電(dian)(dian)(dian)(dian)(dian)(dian)池充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)都利用降壓(ya)型(開關或(huo)線性(xing))架構，用高于(yu)電(dian)(dian)(dian)(dian)(dian)(dian)池最(zui)高電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)源(yuan)給電(dian)(dian)(dian)(dian)(dian)(dian)池充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)。以前(qian)的(de)(de)(de)(de)充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)器(qi)產品輸入(ru)(ru)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)一(yi)般限制(zhi)為(wei)大約30V。這樣(yang)的(de)(de)(de)(de)限制(zhi)使設(she)計(ji)師(shi)無法(fa)將電(dian)(dian)(dian)(dian)(dian)(dian)信(xin)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)或(huo)者具42V開路電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)的(de)(de)(de)(de)太陽能電(dian)(dian)(dian)(dian)(dian)(dian)池板作為(wei)可(ke)行的(de)(de)(de)(de)輸入(ru)(ru)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)。在有(you)(you)些情(qing)況下，希望使用的(de)(de)(de)(de)輸入(ru)(ru)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)涵蓋了高于(yu)和低于(yu)電(dian)(dian)(dian)(dian)(dian)(dian)池電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)的(de)(de)(de)(de)范圍。設(she)計(ji)一(yi)款應對此類(lei)難題(ti)的(de)(de)(de)(de)解決方案通常(chang)需要混(hun)合使用高精度的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)流檢測放大器(qi)、ADC、一(yi)個用于(yu)控(kong)制(zhi)充(chong)(chong)電(dian)(dian)(dian)(dian)(dian)(dian)的(de)(de)(de)(de)微處理(li)器(qi)、一(yi)個高性(xing)能DC/DC轉換器(qi)以及一(yi)個理(li)想二極管或(huo)多路復用電(dian)(dian)(dian)(dian)(dian)(dian)路。

　　強大的充電(dian)解決(jue)方案提供無(wu)與倫(lun)比的靈活(huo)性

　　LTC4000可將任何外部補償的DC/DC電源轉換成具電源通路(PowerPath?)控制的全功能電池充電器。可由LTC4000驅動的典型DC/DC轉換器拓撲包括但不限于：降壓、升壓、降壓-升壓、SEPIC和反激式拓撲。該器件提供精確的輸入和充電電流調節，在3V至60V的寬輸入和輸出電壓范圍內工作，實現了與各種不同的輸入電壓源、以及不同尺寸和化學組成的電池組的兼容性。由于該器件的通用型配置，因此其典型應用十分廣泛，包括高功率電池充電器系(xi)統、高性能(neng)便攜式儀器(qi)、電池(chi)后備系(xi)統、配有工業電池(chi)的設(she)備以及筆記(ji)本/小(xiao)型(xing)筆記(ji)本電腦。

　　除了可(ke)(ke)(ke)(ke)以與(yu)很多不同的(de)(de)DC/DC拓(tuo)撲(pu)(pu)結合，LTC4000的(de)(de)高壓能(neng)力還(huan)允許該(gai)器件構成強(qiang)大和(he)幾乎可(ke)(ke)(ke)(ke)使用(yong)任何輸(shu)(shu)(shu)入電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(參見圖(tu)4和(he)圖(tu)5)的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)解決(jue)方案。為(wei)了確保(bao)來自(zi)這(zhe)些(xie)輸(shu)(shu)(shu)入的(de)(de)功率傳送給合適(shi)的(de)(de)負載(zai)，LTC4000采(cai)用(yong)了一(yi)種智能(neng)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源通路拓(tuo)撲(pu)(pu)，當(dang)輸(shu)(shu)(shu)入功率有(you)限時，該(gai)拓(tuo)撲(pu)(pu)可(ke)(ke)(ke)(ke)優先為(wei)系統負載(zai)供(gong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)。LTC4000控制(zhi)外部(bu)PFET，以提供(gong)低(di)損耗反向電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流保(bao)護、電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池的(de)(de)低(di)損耗充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)和(he)放電(dian)(dian)(dian)(dian)(dian)(dian)(dian)以及即時接通工作(zuo)，這(zhe)樣就可(ke)(ke)(ke)(ke)以確保(bao)即使在電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池沒電(dian)(dian)(dian)(dian)(dian)(dian)(dian)或深度放電(dian)(dian)(dian)(dian)(dian)(dian)(dian)時，當(dang)一(yi)插上電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源，系統電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源就能(neng)立即可(ke)(ke)(ke)(ke)用(yong)。外部(bu)檢測電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻器提供(gong)輸(shu)(shu)(shu)入電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流和(he)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流信息，從而使LTC4000能(neng)與(yu)涵蓋mW至kW功率范圍的(de)(de)轉換器一(yi)起使用(yong)。

圖4：LTC4000和LTC3789：6V至36V_IN、4節(jie)5A鋰離子電池(chi)充電器(qi)

圖(tu)5：圖(tu)4電(dian)路中系統負載為4A時效率隨VIN的變化

　　LTC4000的全功能電池充電控制器可為各種化學組成的電池充電，包括鋰離子/聚合物/磷酸、密封鉛酸(SLA)和鎳化學組成。該電池充電器還提供(gong)精確的電流(liu)檢測功能，從而在大電流(liu)應用情(qing)況(kuang)下允(yun)許較(jiao)低的檢測電壓。

　　結論

　　新(xin)式便攜(xie)式產品設計師的(de)(de)工作(zuo)極富挑戰性(xing)，尤其是涉及到電(dian)(dian)源時。客戶不斷(duan)要求更多功(gong)能以(yi)導致需(xu)要更大的(de)(de)功(gong)率(lv)，結果是電(dian)(dian)池越(yue)來越(yue)大。同時，客戶希望可方便地(di)用(yong)幾(ji)乎(hu)任(ren)何(he)可用(yong)的(de)(de)電(dian)(dian)源給這些電(dian)(dian)池充電(dian)(dian)。盡管便攜(xie)式電(dian)(dian)源領域(yu)的(de)(de)這些趨勢造成了設計挑戰，但是LTC4155和(he)LTC4000讓設計工作(zuo)變得簡單多了。在(zai)低壓(ya)系統中，LTC4155高(gao)效(xiao)率(lv)地(di)提供(gong)高(gao)達3.5A的(de)(de)充電(dian)(dian)電(dian)(dian)流(liu)，而且(qie)提供(gong)很多高(gao)性(xing)能功(gong)能。LTC4000可構成強大的(de)(de)充電(dian)(dian)解決方案，而且(qie)幾(ji)乎(hu)可使(shi)用(yong)任(ren)何(he)輸入，從(cong)而提供(gong)了無與(yu)倫比的(de)(de)性(xing)能和(he)靈活性(xing)。