NTT DoCoMo開發出了能夠利用太陽能電池發電的手機充電器，并且(qie)在“CEATEC JAPAN 2009（圖(tu)1，圖(tu)2）。該充(chong)(chong)電(dian)器的(de)最大輸出(chu)電(dian)流約為(wei)300mA，在日照良好(hao)的(de)場所只需(xu)3～5小時即(ji)可充(chong)(chong)滿手機的(de)鋰離子充(chong)(chong)電(dian)電(dian)池(chi)。外形(xing)尺寸為(wei)114mm×146mm×15mm。

　　除太陽能電(dian)(dian)池充(chong)(chong)電(dian)(dian)器(qi)(qi)(qi)外(wai)，NTT DoCoMo還開(kai)發出(chu)了暫(zan)時儲存太陽能電(dian)(dian)池生成電(dian)(dian)量(liang)的(de)(de)“輔助充(chong)(chong)電(dian)(dian)適配(pei)(pei)(pei)器(qi)(qi)(qi)”（圖3）。通(tong)(tong)過(guo)(guo)與太陽能電(dian)(dian)池充(chong)(chong)電(dian)(dian)器(qi)(qi)(qi)組合(he)使用(yong)，白天(tian)太陽能電(dian)(dian)池產生的(de)(de)電(dian)(dian)量(liang)可(ke)以(yi)存儲在輔助充(chong)(chong)電(dian)(dian)適配(pei)(pei)(pei)器(qi)(qi)(qi)中，在夜(ye)間通(tong)(tong)過(guo)(guo)輔助充(chong)(chong)電(dian)(dian)適配(pei)(pei)(pei)器(qi)(qi)(qi)為手(shou)機(ji)(ji)充(chong)(chong)電(dian)(dian)。“完全無需插頭即可(ke)使用(yong)手(shou)機(ji)(ji)”（NTT DoCoMo解(jie)說員）。輔助充(chong)(chong)電(dian)(dian)適配(pei)(pei)(pei)器(qi)(qi)(qi)的(de)(de)電(dian)(dian)流容量(liang)約為1800mAh，對(dui)于(yu)800mAh左右(you)的(de)(de)手(shou)機(ji)(ji)充(chong)(chong)電(dian)(dian)電(dian)(dian)池，“可(ke)以(yi)充(chong)(chong)滿1次(ci)半左右(you)”（同上(shang)）。輔助充(chong)(chong)電(dian)(dian)適配(pei)(pei)(pei)器(qi)(qi)(qi)的(de)(de)外(wai)殼上(shang)標注(zhu)有“Powered by eneloop”的(de)(de)字樣(yang)，由此可(ke)以(yi)推測，其內置充(chong)(chong)電(dian)(dian)電(dian)(dian)池應該是(shi)三洋電(dian)(dian)機(ji)(ji)的(de)(de)eneloop品牌。

　　太(tai)(tai)陽能電(dian)(dian)池充電(dian)(dian)器(qi)采用美(mei)國(guo)SunPower太(tai)(tai)陽能電(dian)(dian)池單(dan)元并聯(lian)的結構(gou)。模塊為NTT電(dian)(dian)子(zi)制造，組(zu)合了使用DC-DC轉(zhuan)換器(qi)的升壓電(dian)(dian)路，以及具(ju)備“MPPT（Maximum Power Point Tracking）”功(gong)能，能夠按照日照條件控(kong)制輸(shu)出功(gong)率達到最大化的IC。借助這(zhe)一結構(gou)，“即使部分單(dan)元位于陰影中，輸(shu)出功(gong)率也不會大幅(fu)下降(jiang)”（同(tong)上）。

圖1：NTT DoCoMo展出的太陽能電池充電器

圖2：太陽能電(dian)池充電(dian)器的概要

圖3：與太陽能電池(chi)充電器(qi)組合使用的輔助(zhu)充電適配器(qi)