Research And Implementation Of Control System Of Interleaved Parallel Boost Converter

With the rapid development of science and technology,switching power supply technology has been more widely used.As an important part of switching power supply technology,DC/DC converters are used in photovoltaic inverters,aviation power systems,communication power supplies,DC microgrids,fuel cells,and storage systems.Energy systems and other fields are playing an increasingly important role.These systems have caused input voltage fluctuations and high output voltage ripple due to the harsh working environment and complex working conditions.Therefore,higher requirements are put forward on the performance of DC/DC converters,and DC/DC converters are also moving towards The trend of high power density,high efficiency,intelligence and digitization is developing.This topic takes the boost converter as the research object,and uses the interleaved parallel topology and fuzzy PI control strategy to carry out the research work on the DC/DC converter.The interleaved parallel topology has low output current ripple and electrical components.With the advantages of small stress,the combination of fuzzy and PI control can improve the robustness and dynamic response of the system.First of all,the research status of DC/DC converters is reviewed,and the working states of the interleaved parallel Boost converters in different time periods are introduced and analyzed,and the characteristics of the topology are analyzed theoretically,including the current ripple of the inductor.Wave analysis,duty cycle analysis,power loss analysis and the analysis of the current sharing problem of the inductor current faced by two-phase interleaved parallel connection,and the current sharing control method between the two inductors is determined.Secondly,through the comparative analysis of traditional PI control and fuzzy PI control algorithms,the fuzzy PI control strategy is adopted for the staggered parallel Boost converter,combined with the voltage and current double closed-loop control topology,so that the system voltage has a stable output,small ripple,and dynamic Features such as fast response.The device parameters of the main circuit are determined by calculation,and the model of the interleaved parallel Boost converter is built and the control strategy is simulated and verified by Matlab/Simulink,and the simulation results are analyzed.Finally,the STM32F334 ARM chip is selected as the main controller,and a prototype of the staggered parallel Boost converter is designed.The circuit schematic diagram of each module of the hardware circuit and the software control structure diagram are given,and an experimental platform is built for research and analysis.The test results show that the designed interleaved parallel Boost converter has low voltage ripple,high efficiency and good dynamic response,and has reached the expected goal.