一种新的双输入直流变换器

在两种以上能源输入的分布式供电系统中,采用多输入直流变换器替代多个单输入直流变换器,能够简化电路结构,降低系统成本.提出一种新的双输入Buck直流变换器,该电路具有电路结构简单、开关器件电压应力低、既可单独向负载供电,又可同时向负载供电等优点.分析双输入Buck直流变换器工作原理,给出变换器的稳态关系式,提出能量管理方法,最后通过一个420W的原理样机验证了理论分析的正确性和控制策略的有效性.

A New Double-Input DC-DC Converter

In the distributed power system with two or more sources, the application of multiple-input converter instead of using several single-input converters can simplify the circuit and decrease the cost of the power system. A new double-input Buck DC/DC converter is proposed in this paper. The proposed topology has the following advantages: the circuit is simple, the voltage stress of the switches is low and the sources can deliver power to the load individually or simultaneously. The operation modes and the steady-state analysis are presented. Power management method of the new converter is also introduced. Finally, a 420W prototype is built to verify the theoretical analysis and the effectiveness of the control strategy.