一种快速脉冲充电器的研究

Research of Fast Pulse Charger

目前蓄电池的快速充电器大多采用脉冲充电方式,充电周期中包括正脉冲充电时间、停止充电时间以及负脉冲放电时间。本文中充电器由反激变换电路和充放电电路构成,反激变换电路提供输出电压,实现电气隔离,充电回路是可控的双向buck/boost电路,可以工作在正脉冲充电和负脉冲放电模式。并且在反激电路后加PFC控制芯片,采用平均电流法控制,从而提高系统的功率因素。

At present, most fast battery chargers involve some form of pulse charging where a short high current charging pulse is followed by a rest period and in some cases a very short discharging pulse. In this paper the first flyback power part is used to generate the regulated output voltage with electrical isolation. The second power part is a bi-directional Buck/ Boost converter which can generate positive/negative charging pulse. In addition, add a PFC IC chip which is controlled by average current in the flyback converter, the power factor of the fast charger system is improved based on the current feedback.