近年來，電池太(tai)陽能(neng)充電變得非常流行。一塊太(tai)陽能電池的典型電(dian)(dian)(dian)壓為0.7V。許多太陽能(neng)電(dian)(dian)(dian)池(chi)板都(dou)有8塊串聯電(dian)(dian)(dian)池(chi)，因此最多能(neng)夠產生5.6V的電(dian)(dian)(dian)壓。利(li)用(yong)降壓充(chong)電(dian)(dian)(dian)器(qi)，這一電(dian)(dian)(dian)壓足以(yi)將一塊單體鋰離子電(dian)(dian)(dian)池(chi)（例如(ru)：手機電(dian)(dian)(dian)池(chi)等）充(chong)電(dian)(dian)(dian)到4.2V。但是，相同(tong)的太陽能(neng)電(dian)(dian)(dian)池(chi)板用(yong)于(yu)為多體鋰離子電(dian)(dian)(dian)池(chi)組（例如(ru)：筆記(ji)本電(dian)(dian)(dian)腦用(yong)的電(dian)(dian)(dian)池(chi)）充(chong)電(dian)(dian)(dian)時，則要求(qiu)使用(yong)一個(ge)升壓充(chong)電(dian)(dian)(dian)器(qi)。

　　目前，市場上銷售的大多數充電器均基于降壓拓樸結構，因此要求其輸入電壓高于電池完全充電電壓。但是，對降壓電池充電器進行改進，便可以讓其成為一種升壓電池充電器。下面將介紹實施這種改進過程中需要注意的一些重要問題，并提供一個設計實例。該設計實例使用了TI的bq24650 太陽能充電器(qi) 的原理圖(tu)。