Research On Boost-Cuk Combined Converter With High Gain And Low Current Ripple

Since the industrial revolution,fossil fuels have been widely used,but seriously pollute the environment,thus promoting the rapid development of new energy.In particular,photovoltaic power generation is increasingly used,but the output voltage level of photovoltaic panels is low,which cannot meet the needs of practical applications.Therefore,high-gain,low-ripple DC converters are the focus of research.In this paper,based on the traditional Boost and Cuk converters having the same input unit,using shared input and parallel output,a Boost-Cuk combined converter is proposed and magnetically integrated.Analyzing the working conditions of the circuit,the voltage gain is2D/(1-D)times,and the current ripple is greatly reduced to 50% of the pre-integration.On this basis,the switching inductor replaces the input inductor,and a Boost-Cuk combined converter with a voltage multiplier unit is proposed and magnetically integrated.Analyzing the circuit,the voltage gain is increased to D(D+3)/(1-D)times,and the ripple is also significantly reduced.At the same time,the diode spike current caused by the capacitance imbalance is analyzed.Then,on the basis of the Boost-Cuk combined converter,the coupled inductor replaces the input inductor,and two coupled inductor Boost-Cuk combined converters are proposed.Comparative analysis shows that the voltage gain is significantly improved to(N+2)D/(1-D)Times,while retaining the characteristics of continuous current.In order to further improve the voltage gain,the CLC coupled inductor voltage doubler unit replaces the coupled inductor,and two CLC coupled inductor voltage doubler unit Boost-Cuk combined converters are proposed.The voltage gain is significantly improved,which is(2D+(2-D)N)/(1-D)times,the current remains continuous and has good electrical performance.After that,the CCM and DCM mode analysis of the proposed CLC coupled inductance voltage doubling unit Boost-Cuk combined converter are carried out to obtain the boundary conditions and converter performance parameters,and build a voltage negative feedback closed loop,collect the output voltage,and adjust the switch tube by PI control.The switching frequency is stable,and the output is stable.The simulation and experiment of the proposed converter verify the correctness of the theoretical analysis.The paper has 65 pictures,12 tables and 60 references...