Research On Application Of LLC Resonant Converter In Power Electronic Transformer

With the continuous development of society,the user demand for electricity quality is getting higher and higher,and the traditional transformer has not satisfied more and more demand for electricity and to ensure the stability of power quality and safety.A new type of power transformer that power electronic transformer has been rapid development,it not only has the function of traditional transformers,but also to protect the quality of electricity.Therefore,the power electronic transformer research is very practical value.DC/DC converter is an important part of PET,DC/DC converter makes PET volume and weight reduction,but also play the role of power transmission,electrical isolation and so on.Therefore,this paper will DC/DC converter as the main research content.This dissertation analyzes the main loss source of DC/DC converter is switching loss.To this end,the introduction of soft switching technology to reduce the switching losses.The use of soft-switching technology to reduce switching losses,to achieve zero-voltage switch switch,zero current switch.Several kinds of common soft-switching technology converters are analyzed and compared.According to the electric field of PET,the LLC resonant converter is selected as the DC/DC converter.The topology of the LLC resonant converter is discussed and chosen.The inverter circuit adopts full-bridge and rectifier filter circuit with full-wave rectifier circuit.The structure of the LLC resonant converter is studied by using the fundamental component method of the LLC resonant converter.The working area of the LLC resonant converter is determined,the operating frequency range of the ZVS and ZCS is satisfied.The DC gain characteristics and no-load characteristics of LLC resonant converter are studied and analyzed.Finally,the simulation of PET with LLC resonant converter is carried out by using MATLAB simulation software,and the input and output waveforms of PET are analyzed and the feasibility of LLC resonant converter in PET is judged.As well as to verify the LLC resonant converter in the working state of the voltage,current and other parameters and dissertation in the analysis of the same.