The Study Of Phase-shifted Full-bridge DC-DC Converter Based On Active-Disturbance Rejection Control

With the rapid development of modern science and technology and the progress of the society,the electronic products from all walks of life put forward higher requirements for Weight,stability,adaptability,dynamic performance,especially the development in areas such as automotive,communications and aerospace,makes a new challenge on how to improve the efficiency,reliability and the response speed of power switching converter.Aiming at improving output stability,adaptability and response speed of the phase shifting full bridge DC-DC converter,this article use the NPID control strategy combine the Auto-Disturbance Rejection Controller(ADRC)to form a new compound ADRC control method,which can have the high robustness characteristics of ADRC and strong adaptability and widely use of PID,and the high dynamic response speed at the same time.Combining the theoretical analysis and MATLAB simulation experiment,this paper test the performance of the new ADRC and through the actual circuit parameter design and optimization,use the hardware platform verify the control performance of ADRC.Firstly,establishing a small signal mathematical model of the main topological topology of the phase shift to obtain the relationship between the input and output of the system and the quantity of disturbance.Secondly,in view of the shortcomings of the traditional PID control in the application of variable static point system,the principle of ADRC composition is deeply studied and the theoretical analysis of its three modules is carried out.Again this paper analyzes the differential acquisition feature of the differential tracker and the introduction principle of the transition process.Then the principle of NPID was researched,and the control model of NPID was obtained based on PID control parameters.As the core module of ADRC,the expansion state observer is designed and the parameters are simulated.In this article,through the design and optimization of hardware circuit parameters,the 1kw output experimental platform is built to test the output performance.Completing the design of software program,this article combined with the simulation and theory analysis,it uses the hardware platform of DC-DC converter checkout the output performance of ADRC,through the lose and output disturbance experiment.After experimental verification,it can be found that the new compound ADRC control output not only has high robustness,but also has good dynamic response rate.