Wide Output Range High Frequency High Efficiency DC-DC Converter

With the development of the economy and the consumption of primary energy,electric vehicles are increasingly used for sales due to their green environmental characteristics.DC-DC power electronic converters are an indispensable part of electric vehicles.Solar energy is green,clean,widely distributed,and inexhaustible.With the DC-DC converter,the energy generated by the solar energy can be transmitted to the battery pack in the electric vehicle.However,the output voltage of the photovoltaic module is low,and the battery pack has a large voltage gap when there is no electricity and full power.Therefore,a new wide-range output,high gain,high efficiency DC-DC converter is needed.This paper proposes a new topology that provides a wide range of outputs for the load,with a gain ratio of 14.3,and guarantees a full range efficiency of over 92% and an efficiency of up to 95%.At first,it discusses the research background and significance of DC-DC converter.Analyze the related topology.According to the design requirements of the device,a feasible circuit scheme is discussed.Through the comparison of circuit parameters and structures,the optimal combination of boost converter and flyback converter is determined.The operation principle is analyzed.Secondly,the circuit parameter design,magnetic design and driver design are performed.For achieving high gain and zero voltage switching of main MOSFET,the auxiliary capacitor provide reverse current to the parasitic capacitor of main MOSFET,which reduces the turn on loss of circuit and provide part of output voltage.Thirdly,magnetic design section selects a suitable magnetic material for high frequency and choose a right core shape.Different winding ways are compared,and choose the most suitable one.Finally,compared different components of the circuit,choose the best solution.Simulate the proposed converter with LTspice and analyzed the result of experiment.The experimental results show that the proposed converter can work with high efficiency,wide output voltage range,high voltage gain and lower temperature rising.This converter can be applied to the photovoltaic module in electrical vehicles.