新型零电压开关双向直流变换电源

一个用于中小功率的双向DC——DC变流装置,能将直流电压从24 V提升到240 V,也可以将240 V直流电压变换成24 V。在变流器的两个桥式电路中间使用一个隔离变压器,在不增加电路器件的情况下,实现电能的双向传递,变流器通常工作在降压方式,主直流电源来自交流或燃料电池,主电源向负载提供电能的同时向蓄电池充电,在主直流电源故障的情况下,蓄电池替代主直流电源,向负载供电。使用适当的控制策略,实现元件的零电压开关。在对电源系统的工作原理进行理论分析的基础上,对其进行了仿真和实验验证,证明系统具有转换效率高、性能稳定和电路简单等特点。

A ZVS Bi-directional DC-DC Converter

A bi-directional DC-DC converter,which can boost DC voltage from 24 V to 240 V and also can buck DC voltage from 240 V to 24 V,used in low or medium power application is presented in the paper.An isolation transformer is used in the converter and two full-bridges are on the both sides of transformer.Achieving bi-directional flow of power using the same power components,the converter essentially operates in the buck mode,the main DC power,which usually converted from ac or fuel cell,provides power to the load and charges battery to 24 V,only on failure of the main source,it uses battery to replace the main power.A new control strategy is applied in the converter to realize zero voltage switching without additional devices in the circuit.The operating principle and theoretical analysis are also provided in the paper,and simulation and experimental results verifying the system of high efficiency,reliable and simplicity.