蓄电池充电系统双向DC/DC的研究与设计

Research and Design of Bidirectional DC/DC for Battery Charging System

蓄电池在化能过程中,传统采用外加大负载放电,这此过程造成了能量损失。故本文采用三相电压型PWM电路,双向DC/DC变换电路,既能充电又能放电回馈电网。采用移相控制DC/DC全桥变换器(可以实现0～180°连续可调)具有宽输出,可实现能量的双向流动及电气隔离。H桥逆变采用了PWM移相控制,结合软件关技术,降低开关损耗,提高电源效率。可以通过控制移相角改变IGBT的导通时间,从而方便地调节输出电压的大小。可以用于蓄电池的充放电,放电能量回馈电网。引入双闭环调节,变电流间歇充电实行快速充电。

In the process of chemical energy,the battery is traditionally used to increase the load discharge,which causes energy loss.Therefore,this paper uses a three-phase voltage-type PWM circuit,a bidirectional DC/DC converter circuit that can both charge and discharge back to the grid.It adopts phase shift control DC/DC full-bridge converter(which can realize continuous adjustment from0to180°)with wide output,which can realize bidirectional flow and electrical isolation of energy.H-bridge inverter adopts PWM phase shift control,combined with software-off technology to reduce switching loss and improve power efficiency.The on-time of the IGBT can be changed by controlling the phase shift angle,thereby conveniently adjusting the magnitude of the output voltage.It can be used for charging and discharging of batteries,and the discharge energy is fed back to the grid.Double closed loop regulation and variable current intermittent charging are introduced for fast charging.