单极性电流控制半桥电压平衡电路研究

电压平衡电路不但可以将两线制直流微网转变成三线制直流微网,而且还可以应用在平衡串联电容或电池组电压等场合。半桥电压平衡电路具有结构简单、成本低廉等优点。但是,在互补驱动条件下,当电感电流工作在双极性时存在无功电流。因此,在前期研究基础之上,提出了单极性电流控制方法,详细地分析了单极性控制下半桥电压平衡电路工作原理。仿真和实验结果表明,在单极性控制下半桥电压平衡电路能够有效地实现输出电压均衡功能,并消除无功电流。

Research on Half-bridge Voltage Balanced Circuit Based on Unipolar Current Control

A voltage balancing circuit not only may change a two-wire DC power system into a three-wire DC power system,but also can balance voltage of series capacitors or battery packs.A half-bridge voltage balanced circuit is a simple and low-cost topology,but it may have a reactive current when the inductor current works in bipdarity under complimentary driving technology.A unipolar current control method was proposed and the operation principle was analyzed in details.Finally,the simulation and experimental results verify the half-bridge voltage balanced circuit with the proposed control method has a good ability of balancing voltage and eliminating active current in stable and dynamic states.