一种新型双输入反激DC/DC变换器

A New Double-Input Flyback DC/DC Converter

传统多输入反激DC/DC变换器的电路拓扑结构简单,能实现多种新能源联合供电,在中小功率应用场合具有很好的应用前景。但该变换器的变压器有多个一次绕组,结构复杂、功率器件电压应力大,只能实现多种能源的分时供电。本文提出一种新型的多输入反激DC/DC变换器,变压器仅有一个一次绕组,开关器件电压应力降低,各输入源既可以单独向负载供电又可以同时向负载供电。以双输入为例详细分析该变换器的工作原理,推导其输入输出基本关系,提出能量管理方法,还推导出一族隔离型多输入变换器的基本电路拓扑。最后通过一个120W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。

The traditional multiple-input flyback converter has a simple configuration,and it can be used in the system with two or more sources.It has a good application prospect in the low/medium power situation.However,the converter has some disadvantages such as complex transformer structure due to multiple primary windings,higher voltage stresses across the power switches,and the load can＇t achieve power from a variety of energy sources simultaneously.This paper proposes a novel multiple-input flyback converter.The transformer has only one primary winding and the voltage stresses of the power switches are reduced.All the input sources can provide energy simultaneously or individually.A double-input flyback DC/DC converter is taken as an example to analyse its operating principle in detail.The voltage conversion ratio of the input and output voltage is deduced.Power management method of the proposed converter is proposed.Furthermore,a family of multiple-input isolated DC/DC converters is deduced.The experimental results of a 120W prototype verify the correction of the theoretical analysis and the effectiveness of the control strategy.