Sliding Mode Control Of Interleaved Magnetic Integrated DC/DC Converters

With the requirement of small current,large voltage and large capacity of the converter in the application,in order to meet the requirements of the actual performance index,the staggered parallel technology is introduced therein.In order to further reduce the size of the converter,magnetic integration technology is applied therein.When these performances are improved,it is found that the effects of traditional control strategies cannot be guaranteed,and the uncertainty of energy sources such as solar power generation and wind power generation and the fluctuation of load cannot be well solved.For the structure of the DC/DC converter,compared to the traditional PID control,the control law of the sliding mode control is logically in accordance with the converter switching structure,so this paper describes in detail the application of the sliding mode control in the converter.In order to improve the performance of the two-phase interleaved DC/DC converter and optimize the design of the system controller.This article proposes using the four terms of the error term,the error integral term,the error differential term,and the error double integration term as the control state variables to reduce the steady-state error of the output response and improve the dynamic performance of the system,and to verify the new slip.The existence conditions and stable area of the die surface.For the problem of unfixed frequency,a harmonic modulation signal is applied,and only the duty cycle is changed and the frequency is fixed.With the switching of the switch tube,the advantages of the SMC are brought to an optimal state.The control block diagram simulation model of the sliding mode control scheme proposed in this paper is established,and the simulation results of each variable in the control process of the scheme are verified.In order to prove the advantages of sliding mode control,this paper establishes the small signal mathematical model of the converter in the CCM mode,provides the theoretical basis for the PI control of the converter,designs the PI controller based on this,and simulates the two control strategies.Contrast with experiment.At the same time,the main circuit and control circuit of the sliding mode control scheme are given,and the steady state and dynamic response of the converter under the sliding mode control and PI control scheme are compared.Experiments show that the sliding mode control proposed in this paper is more effective than PI control.better.