光伏系统用蓄电池双向脉冲充放电电路的设计

Design of Bi-directional Pulse Charging and Discharging Circuit for Battery in Photovoltaic System

针对分布式家用光伏发电系统中储能蓄电池充电过程中存在硫化、气体析出现象、充电效率低问题,文中采用双向Buck/Boost变换器作为充放电主电路,详细分析以正负脉冲方式给蓄电池充电的工作原理。通过控制开关管的开通、关断,实现能量的双向流动,合理设计电感与死区时间,实现软开关。针对500 W光伏电池板,仿真验证设计的合理性。

There is a problem of vulcanization,gas precipitation and low charging efficiency in the process of Storage battery charging in the distributed household photovoltaic power generation system.In this paper,bi-directional Buck/Boost converter was used as the main charge and discharge circuit,and the principle of charging the battery with positive and negative pulse was analyzed in detail.By controlling the opening and closing of the switch tube,the bidirectional flow of energy was realized,and the soft switch was realized by the reasonable design of inductance and dead time.The rationality of the design was verified by the simulation of 500 W PV panel.