21世紀左右，有人將充電機的原理用到了電動車充電器中，充電過程中，不切斷充電通路，用小電阻將電池短路瞬間，進行放電。短路時由于不切斷充電通路，在充電通路中串連了電感。一般在1秒內短路3－5毫秒（1秒=1000毫秒），由于電感里的電流不能跳變，短路時間短促，可以保護充電器的電(dian)(dian)(dian)(dian)源轉換部分。如果把充(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流方向(xiang)叫正，放電(dian)(dian)(dian)(dian)自然為負(fu)了，電(dian)(dian)(dian)(dian)動車業就出現了名詞“負(fu)脈沖充(chong)電(dian)(dian)(dian)(dian)器”，而且稱可(ke)以延長電(dian)(dian)(dian)(dian)池壽命等等。