Research On High Gain Magnetic Integrated Combination Boost-zeta Converter

With the rapid development of the world,the consumption of fossil energy in all walks of life is facing a situation of rapid growth and tight supply and demand.The use of energy in accordance with traditional methods can no longer meet people's needs.In the past few years,various ecological and environmental problems have gradually swept through countries around the world.Photovoltaic power generation and wind power generation have become the hotspots of various scholars.Based on this research hotspot,this paper explores the tasks that DC-DC converters play in converting solar and wind energy into electrical energy and integrating them into the grid.In this paper,the traditional Boost and Zeta boost converters are compared and studied.It is found that the switch-inductor structure of the pre-stage of these two converters has the same function.Therefore,it is proposed to combine the two converters,omitting the repeated structure,so that the voltage gain can be further improved while saving the components.A combined Boost-Zeta converter is formed.The two inductors in the newly proposed converter are magnetically integrated,then the working principle of the converter is analyzed.The specific parameters of the converter are given.The current ripple of the inductor is analyzed,and the design criteria of the coupled inductor are given.The newly proposed converter has been found to have the advantages of high voltage gain and low current ripple.Further research on the converter continues,combined with the idea of switching inductor and switched capacitor,the newly proposed converter is combined with the "LCL" unit to form a high gain combined Boost-Zeta converter.In order to reduce the inductor current ripple of the converter,the three inductors in the newly proposed converter are magnetically integrated to form a high-gain magnetic-combined Boost-Zeta converter.The working principle of the converter is analyzed,and the performance parameters of the converter are given.The three-inductance magnetic integration scheme is designed.Then,a detailed comparison of the converters proposed in this paper is made.The advantages and disadvantages of each converter are analyzed.Finally,the magnetic components of the converter proposed in this paper are designed,and the control design of the high gain magnetic integrated combination converter is adopted.The DSP28335 is used as the control core,the sampling circuit and the driving circuit are designed,and the output voltage is PID adjusted.When the duty cycle is constant,the stability of the output voltage is controlled by controlling the duty cycle of the PWM waveform.Then the correctness of the simulation verification theory is verified by PSIM simulation.Finally,the experimental prototype was made to verify the theoretical analysis.The inductor current waveform and the output voltage waveform of the main switch were analyzed.The circuit analysis and magnetic component design were verified.