充電器是電器附件，英文名稱Charger,通常指的是一種將交流電轉換為低壓直流電的設備。充電器在各個領域用途廣泛，特別是在生活領域被廣泛用于手機、相機等等常見電器。
    充電器是采用電力電子半導體器件，將電壓和頻率固定不變的交流電變換為直流電的一種靜止變流裝置。在以蓄電池為工作電源或備用電源的用電場合，充電器具有廣泛的應用前景。
    充電器有很多，如鉛酸蓄電池充電器、閥控密封鉛酸蓄電池的測試與監測、鎘鎳電池充電器、鎳氫電池充電器、鋰離子電池充電器、便攜(xie)式電(dian)(dian)(dian)子(zi)設備鋰離子(zi)電(dian)(dian)(dian)池充(chong)電(dian)(dian)(dian)器(qi)、鋰離子(zi)電(dian)(dian)(dian)池保護電(dian)(dian)(dian)路多(duo)功能(neng)充(chong)電(dian)(dian)(dian)器(qi)、電(dian)(dian)(dian)動車蓄電(dian)(dian)(dian)池充(chong)電(dian)(dian)(dian)器(qi)等。