Research On New High Gain Boost Converters Based On Coupled Inductor And Voltage Doubling Unit

Environmental pollution is the biggest obstacle to the sustainable development of human beings,so it is very important to seek green energy.Fuel cell power generation is one of the most studied power generation methods because of its clean and efficient characteristics.DC-DC power conditioning unit is the core component of fuel cell power generation device,so it is extremely necessary to study high-gain DC-DC converter.Firstly,the CIBVD-Boost converter used in DC-DC unit of fuel cell power plant is introduced.In this paper,the steady-state gain equation and the voltage stress equation of switching devices are deduced based on the working principle of CIBVD-Boost converter.The theoretical verification is carried out by simulatio n.The results show that the topological gain increases(1+N)times than the basic Boost circuit gain,but the voltage stress of switching diodes is still large.In order to reduce the voltage stress of switching diodes,the voltage stress of CIBVD-Boos is verified by simulation.A novel CISC-Boost converter topology is proposed based on switched capacitor structure.The working principle of CISC-Boost converter is analyzed in detail,and its steady-state characteristics are deduced.The characteristics of CISC-Boost converter are verified by building a 30 W simulation model and experimental model.The results show that the proposed CISC-Boost converter has high gain and low voltage.The advantages of switching stress are based on CISC-Boost converter topology,and two new CISC-Boost converter topologies,CISC-Boost(A)and CISC-Boost(B),are derived to provide more solutions.However,the input current of CISC-Boost series converters is trapezoidal in CCM state,and the reliability of fuel cells is affected;in order to reduce the input current ripple,at the same time,fuel cells are affected.The power chopper unit in the device has the characteristics of high gain and switching voltage stress.A new high gain DC-DC converter topology-CISS-Boost converter is proposed in this paper.Based on the working principle of the converter,the steady-state characteristic equation of the CISS-Boost converter is derived.The principle and feasibility of the converter are verified by building a 60 W simulation and experimental model.The results show that CIS-Boost converter is feasible.S-Boost converter has the advantages of continuous input current and low fluctuation,high voltage gain and low switching voltage stress.In this paper,the structure of the converter is also evolved based on CISS-Boost converter,and the CISS-Boost(A)topology is obtained.The purpose is to provide more solutions for DC-DC units in fuel cell power generation devices.The topology studied in this paper is mainly applied to DC-DC units in fuel cell power generation devices.The design of the topology can well meet the power conversion conditions of DC-DC units in fuel cell devices.In this paper,the working principle of the new high gain converter is analyzed in detail,the steady-state characteristic equation of the converter is derived,and the main circuit parameters are designed.In order to verify the theoretical correctness and engineering feasibility,simulation models and experimental models are built respectively.