The Design And Control Research On Phase-shift Full Bridge Bi-Directional DC/DC Converter

Development of power electronics gives considerable progress in science and technology,switching power supplies and power devices in the field of bi-directional DC/DC converter,both in size,weight,switching losses,steady-state accuracy dynamic response,the conversion efficiency achieved some results.But the single control strategy is difficult to meet the system requirements for robustness and limited topology there are also disadvantages:control of complex,low conversion efficiency large energy losses.With the extensive application of modern control technology and the development of advanced control strategies for the control scheme DC converter provides a variety of options,but also to improve and perfect control effect expand more room for development.Attracted more and more attention and interest.Therefore this bi-directional DC/DC converter for control strategies and closed-loop control programs conducted in-depth research.First introduced DC/DC converter applications,for bi-directional DC/DC converter status and development,the development of soft-switch technology were reviewed,discussed several control strategies,advantages and disadvantages of various control strategies were compared introduced subsequently the bidirectional DC/DC converter topologies studied and boost mode and buck mode theory,the process operation,control,described in detail,while the voltage spike caused by the problem of its mechanism are discussed and solutions generated,Next a mathematical model of the study were studied.The establishment of a small-signal model of bi-directional DC/DC converter.Second,on the basis of the various device parameters converter carried out a detailed analysis of the design and calculation,including the transformer turns ratio ahead of the lagging leg parallel capacitance,resonant inductor,dead time,the output filter inductor capacitors. By matlab/simulink software to build a simulation system the open-loop simulation carried out to verify the theory and design of DC/DC converter topologies.At the same time the design of the closed-loop simulation system voltage loop and current loop,the design parameters of the PI using the engineering design method.Simulation results demonstrate the feasibility of the design methods and design parameters.Finally, the principle and design method of advanced control strategies that sliding mode control.Details of the sliding mode control scheme bidirectional Buck-Boost converter.Through the phase-shifted full-bridge DC/DC converter equivalent analysis,combined with sliding mode control scheme for controlling non-isolated DC/DC converter,and completed the phase-shifted full-bridge DC/DC converter of sliding mode control,and through the matlab/simulink software conducted various typical simulation,compared to the double-loop control simulation results,the theoretical analysis and simulation ,based on the sliding mode control to verify the feasibility of suppressing disturbances in terms of superior performance and design.