高电压增益混合型DC-DC变换器研究

随着分布式发电的出现，对高增益DC-DC变换器的要求越来越高。为了获得更高的电压增益，提出一种光伏发电用混合型高电压增益非隔离单开关DC-DC变换器。该变换器将传统的Boost和Cuk变换器并联，详细讨论了其拓扑结构、工作原理以及电路参数设计，实现了基于Matlab/Simulink的仿真研究和基于单片机的150 W实验样机。仿真研究和实验结果与理论分析吻合较好，验证了理论分析的正确性以及混合型DC-DC变换器拓扑结构的有效性。所提混合型拓扑使用元件数较少的单一功率开关，并能提供比非隔离式传统变换器更高的电压增益。该拓扑在单功率开关作用下可提供连续电流的工作模式，而且降低了功率开关和二极管的电压应力。

A hybrid DC-DC converter with higher voltage gain

With the advent of distributed generation, the desire for high boost DC-DC converter development has increased. In order to obtain a higher voltage gain, a hybrid high voltage gain non-isolated single switch DC-DC converter for photovoltaic power generation is proposed. The proposed converter connects the standard conventional Boost and Cuk converters in parallel. The circuit topology, working principle and circuit parameter design are discussed in detail. Simulation is carried out based on Matlab/Simulink and the 150 W experimental prototype based on MCU. The simulation and experimental results are in good agreement with the theoretical analysis.This verifies the correctness of the theoretical analysis and the effectiveness of the proposed hybrid DC-DC converter topology. The proposed hybrid topology uses a single switch with a lower component-count and provides a higher voltage gain than non-isolated traditional converters. This topology provides continuous current mode operation with the help of a single power switch, which gives less voltage stress on the controlled switch and diodes. This work is supported by the National Natural Science Foundation of China (No. 61702182) and Outstanding Youth Project of Hunan Education Department (No. 20B328).