NTT DoCoMo開發出了能夠利用太陽能電池發電的手機充電器，并且在“CEATEC JAPAN 2009（圖1，圖2）。該(gai)充電器的最(zui)大輸出(chu)電流約(yue)為300mA，在日照良好的場(chang)所只需3～5小(xiao)時即可充滿手機的鋰離(li)子(zi)充電電池。外(wai)形尺寸為114mm×146mm×15mm。

　　除太(tai)陽能(neng)(neng)電(dian)(dian)(dian)(dian)池充(chong)(chong)電(dian)(dian)(dian)(dian)器(qi)(qi)外(wai)，NTT DoCoMo還開發出了暫(zan)時儲存太(tai)陽能(neng)(neng)電(dian)(dian)(dian)(dian)池生成電(dian)(dian)(dian)(dian)量的(de)“輔助(zhu)充(chong)(chong)電(dian)(dian)(dian)(dian)適(shi)配(pei)(pei)器(qi)(qi)”（圖3）。通過與太(tai)陽能(neng)(neng)電(dian)(dian)(dian)(dian)池充(chong)(chong)電(dian)(dian)(dian)(dian)器(qi)(qi)組合使用，白天太(tai)陽能(neng)(neng)電(dian)(dian)(dian)(dian)池產生的(de)電(dian)(dian)(dian)(dian)量可(ke)以(yi)存儲在(zai)輔助(zhu)充(chong)(chong)電(dian)(dian)(dian)(dian)適(shi)配(pei)(pei)器(qi)(qi)中，在(zai)夜間(jian)通過輔助(zhu)充(chong)(chong)電(dian)(dian)(dian)(dian)適(shi)配(pei)(pei)器(qi)(qi)為手(shou)機(ji)充(chong)(chong)電(dian)(dian)(dian)(dian)。“完(wan)全無需插頭即可(ke)使用手(shou)機(ji)”（NTT DoCoMo解說員(yuan)）。輔助(zhu)充(chong)(chong)電(dian)(dian)(dian)(dian)適(shi)配(pei)(pei)器(qi)(qi)的(de)電(dian)(dian)(dian)(dian)流(liu)容量約為1800mAh，對于800mAh左右的(de)手(shou)機(ji)充(chong)(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)池，“可(ke)以(yi)充(chong)(chong)滿1次半左右”（同上）。輔助(zhu)充(chong)(chong)電(dian)(dian)(dian)(dian)適(shi)配(pei)(pei)器(qi)(qi)的(de)外(wai)殼上標注(zhu)有“Powered by eneloop”的(de)字樣，由此可(ke)以(yi)推測(ce)，其內(nei)置(zhi)充(chong)(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)池應該是(shi)三洋電(dian)(dian)(dian)(dian)機(ji)的(de)eneloop品牌。

　　太(tai)陽能電池充電器采用美國SunPower太(tai)陽能電池單元(yuan)并(bing)聯(lian)的結構。模塊(kuai)為NTT電子制造，組(zu)合了使用DC-DC轉(zhuan)換器的升壓電路，以(yi)及(ji)具備(bei)“MPPT（Maximum Power Point Tracking）”功能，能夠按照日(ri)照條件控制輸(shu)(shu)出(chu)功率達到最大(da)化的IC。借助這一(yi)結構，“即(ji)使部分單元(yuan)位于陰影中，輸(shu)(shu)出(chu)功率也不會大(da)幅下降”（同上）。

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：與太陽能電池充電器(qi)組合使(shi)用的(de)輔(fu)助充電適配器(qi)