Research Of Interleaved Boost Integrated LLC Resonant Converter With Hybrid Control

Due to the environment deterioration and fossil energu depletion.New energy power generation is considered to be one of the important ways to solve these two problems.Among these,Photovoltaic power generation has received wide attention,especially the grid-connected photovoltaic power generation system.Affected by the weather,Photovoltaic battery has a wide output voltage range.DC / DC converter with wide input voltage range is Key components of Grid-connected photovoltaic systems,which used to connect photovoltaic cells and inverters.An Interleaved Boost-Integrated LLC resonant converter with high gain and wide input voltage range is analyzed in this paper.Propose a new PWM and PSM hybrid control scheme based on the original PWM control scheme.This dissertation establishes the theoretical model for the converter,The gain characteristics of the converter in two modes of operation are analyzed,According to the simulation analysis on the impact of two boost inductor current sharing of the parameters.Finally,the return power of the converter is calculated.From the perspective of converter characteristics,the converter studied in this paper is more suitable for high gain and high efficiency than traditional LLC.PWM and PSM control belong to fixed frequency control,this paper,the parameters of the converter design through the hybrid control mode switching point selection.And designed the control strategy.Through the loss analysis under different control modes,the loss is compared.Experiment with the converter under the hybrid control strategy.Compare the efficiency of the hybrid control mode with the original PWM control mode.The experimental results show that the converter can optimize the efficiency,and ensuring the original input voltage range under the hybrid control strategy.