An Auxiliary Resonant Soft-switching Quadratic Boost Converter

In the recent years,due to China’s energy development tactics,the new changes have taken place that the new energy power generation systems,such as the wind power and the solar photovoltaic power generation,get the support of national policy and its government investment stands in the leading level of the world for the aspects of capacity.But with the high-speed development and promotion of this system,the requirements of switching DC-DC converter,as the key equipment,also have been more and more.Therefore,it is of the great research significance that the research of the high-gain and soft-switching DC-DC converter with the wide of input,which will solve the problems of the the new energy power generation,like the low level of the power supply voltage,the wide range of the input voltage changes,the unstable state of the energy transfer efficiency and etc,are studied in this paper systematically.Firstly,the research status of the high-gain switching DC-DC converter and the soft-switching DC-DC converter are introduced in this paper.Some kinds of the common high-gain DC-DC converter and soft-switching DC-DC converter are expounded briefly about the working principle of all kinds of converter structure and compared about the advantages and disadvantages of each converter structure.By comparison,it finds that quadratic Boost converter structure is the most conform to the application’s requirements of the new energy power generation system.Secondly,the quadratic Boost converter structure deeply is analyzed in this paper.On account of the different energy transformation conditions of two primary inductances,the quadratic Boost converter is divided into four types,as CCM-CCM,CCM-DCM,DCM-CCM and DCM-DCM.Each type of the quadratic Boost converter is researched in detail about the working principle,operating characteristics,energy transfer mode and etc.The study finds that the quadratic Boost converter can provide high voltage gain,broadening the range of the input voltage.But there are some shortage,such as high switching loss and low energy transfer efficiency.Then,in order to solve the above issues of the quadratic Boost converter and maintain its advantage,an auxiliary resonant soft-switching(ARSS)quadratic Boost converter is proposed in this paper,utilizing a soft-switching resonant circuit method in the basic quadratic Boost converter structure.In this paper,the structure and principle of ARSS quadratic Boost converter will be presented.Furthermore,the operation stages and the main waveforms of this converter at all operation stages will be introduced.Additionally,the on-off relationships of switching devices,the conditions of soft switching,the voltage and current stresses,output characteristics will be researched.The results show that the primary switch and auxiliary switch of the ARSS quadratic Boost converter can be used under the condition of zero-voltage soft-switching conversion,which improves the efficiency of energy transformation.Meanwhile,it can provide higher voltage gain and wider range of input voltage than the traditional soft-switching quadratic Boost converters.Finally,in order to verify the correctness of the above theoretical analysis,in this paper,the appropriate circuit components and parameters is selected to set the simulation model of the basic quadratic Boost converter and ARSS quadratic Boost converter in the MATLAB/Simulink and design the experimental prototype of ARSS quadratic Boost converter based on FPGA-EP4CE15F17C8.The corresponding simulations and experimentations are taken,and their results are analyzed.The simulation results and experimental results are agreed with the above theory analysis conclusion,verifying the correctness of the theoretical analysis,and it is reflected the ARSS quadratic Boost converter design in the paper has definite superiority and innovation to satisfy the higher application requirements of the new energy power generation system.