一种双输入高升压比直流变换器

A dual-input high step-up DC/DC converter

针对以光伏和燃料电池为代表的新能源发电系统存在输出电压低、供电可靠性差的问题,本文提出了一种非隔离型双输入高升压比直流变换器,该变换器两路输入源可以单独供电也可以同时供电,详细介绍了变换器在三种供电模式下的工作原理、电压增益特性、开关器件电压应力以及双输入工作模式下两路输入电流之间的关系。最后搭建了一台100 W的实验样机,实验验证了该变换器具有电压增益高、开关器件电压应力低、可灵活供电等优点。

In view of the problems of low output voltage and poor reliability of power supply in the new energy power generation system represented by photovoltaic and fuel cells,a non-isolated dual-input high step-up DC/DC converter is proposed in this paper.The two input sources of the converter can supply power independently or simultaneously.The working principle of the converter,voltage gain characteristics,voltage stress of the switching devices in three power supply modes and the relationship between the two input currents in dual input mode are analyzed.Finally,a 100W experimental prototype is built.The experimental results show that the converter has the advantages of high voltage gain,low voltage stress of the switching devices and flexible power supply.