Application Based On New Digital Power Technology

As a device for realizing the transmission and conversion of power,the power converter is widely used in various power electronic devices,and has been paid attention by researchers since its debut.In recent years,with regard to the current development of power converters,researchers have proposed many new technologies to improve the performance specifications of power converters.Among them,the digital power technology has the advantages of simple design and long-distance intelligent control has become one of the main research directions at present.However,taking into account the importance of energy research in the converter and the current literature rarely systematically studying the energy distribution and transmission conditions in the system.Therefore,this thesis will study the digital power technology based on the energy in the power converter.This article will use high-frequency DC-DC converters as research objects,and propose to build a complete digital power system based on energy.Which includes analysis of energy in the system,introduction of energy parameters and transmission models using energy parameters,and design of energy-based digital control schemes.The study of energy in DC-DC power converters is not just a response to the large-scale background in which energy conservation is so important.In addition to the transmission of energy throughout the power converter,the efficiency,volume,cost,and stability of the converter are all subject to the energy in the system.Therefore,it is necessary to systematically understand and study the energy in the converter.This paper will analyze the working principle of the flyback DC-DC converter in detail,and use the state space average method to establish the transmission function of the CCM working mode.Combining the existing energy research basis,the energy distribution and transmission conditions in the converter are analyzed.Finally the energy-based converter transmission model expressions are obtained and verified from both theoretical and simulation levels.In addition,the new parameters of the inductor energy ripple are defined in combination with the relationship between the energy modules of the flyback converter,its value range is deduced and the effect on the system performance is verified by simulation.For the nonlinear variable structure switching power supply system,the sliding mode variable structure control algorithm is more widely used in the digital controller design for the power converter because of its non-fixed structure control concept,insensitivity to external disturbances,simple design,and fast dynamic response control features.However,the objective disadvantage of the traditional sliding mode control is the chattering phenomenon in the regulation process.Therefore,this paper uses high-order sliding mode control to design a digital controller for the power converter,which can reduce the chattering and improve the control accuracy.The control algorithm selects a Super-Twisting algorithm which requires less information than other second-order control algorithms and has a simple design advantage.Of course,the design of the digital controller is combined with energy.Finally,the control effect of the energy-based digital controller is verified through MATLAB/Simulink software simulation.