基于半桥变换器与次序耦合变压器的超级电容均压

Voltage Balancing for Supercapacitor Based on a Half-Bridge Inverter and Sequence Coupling Transformer

针对于超级电容串联储能系统中单体电压不均衡的问题,本文介绍了一种基于半桥变换器和首尾次序耦合变压器的均压电路。利用次序耦合绕组可以减小因变压器单元漏感误差而引起的超级电容单体电压不均衡。该电路结构简单,还可以均衡超级电容器的电压,恒定开关频率和占空比,不需要反馈控制环节。通过分析半桥变换器每个工作模态,建立了输出电压方程,推导了串联超级电容电压均衡方程。根据电路特性,分析了变压器匝比设计方程及实现软开关变压器原边漏感要求。仿真及实验结果表明此均压电路具有均压速度快且均压效果好的特点。

According to the problem that cell voltage imbalance of series connected super capacitor in energy storage system,this paper presented a voltage-balance circuit for super capacitors in a half-bridge inverter based on the sequence coupling array integrated magnetic method.Sequence coupling method was used in secondary winding of converter to achieve voltage balance of monomer,which can reduced voltage unbalance caused by leakage error in transformer.The circuit topology is simple,and can automatically balance super capacitor voltage,feedback control can be eliminated when the system is operated with a fixed switching frequency and duty ratio.By analyzing the each working mode of half-bridge converter,established the output voltage equations,and the super capacitor voltage balance equation.According to the circuit characteristics,analyzes the design equation of the transformer turns ratio,and the leakage inductance of the transformer primary to achieve soft switch0 The simulation and experimental results show that this equalizing circuit has both speed and pressure equalizing good features.