一种双输入高增益DC-DC变换器

针对光伏发电系统输出电压低、供电稳定性差等问题,提出一种非隔离双输入高增益直流升压变换器,该变换器在2个BOOST变换器的基础上引入了开关电容电路,实现了高电压增益,且两输入源可以单独或同时向负载供电。分析该变换器的电路结构和工作原理,推导出了3种供电模式下变换器的电压增益表达式以及主要开关器件电压应力,给出了两路同时供电时输入电流之间的关系。最后,搭建了一台100W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、控制简单、可以灵活供电等优点。

Dual-input high step-up DC-DC converter

Aiming at low output voltage and poor power supply stability in the distributed photovoltaic power generation system,a novel non-isolated dual input high step-up DC/DC boost converter was proposed.A switched-capacitor circuit was introduced on the basis of two Boost converters to achieve high voltage gain in the topology,and two input sources can supply power to the load independently or simultaneously.The circuit structure and working principle of the converter were analyzed.The voltage gain expression of the converter and the voltage stress of the main switching devices were derived,and the relationship between two input currents was also introduced.Finally,a 100 W experimental prototype was built.The experiment results verify that the proposed converter has the advantages of high voltage gain,low voltage stress of the switches,simple control and flexible power supply modes etc.