The crude form, chopped, pulsating DC current from conventional chargers produces a less efficient charge.
原油形式，切碎，脉动直流电流从传统充电器生产效率较低的收费。
At present power converters of DC driving system make power supply outputs a high-frequency pulsating current, which is from zero to the armature current. This large ripple damages batteries.
目前国内外电动车直流驱动功率变换器使储能电源输出电流从零到电机电枢电流高频脉动，不利于延长动力电池的使用寿命。
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