Research On Multiple-input Flyback Converter With Single Primary Winding

Energy crisis, environmental pollution and greenhouse effect are the three big problems in theworld, a serious threat to human survival and social development. To vigorously develop new energysources is the trend of world development. New energy includes solar energy, wind energy,geothermal energy, ocean energy and so on. New energy can be continuously regenerated, and can besustainable use. It is harmless to the environment or harm minimization, and resources are widelydistributed. It is suitable for local development and utilization.Due to the new energy in energy supply is not stable, not continuous, with climate change andother shortcomings, the load can not obtain stable electric energy, so it is necessary to adopt powersupply and power supply system of new energy. Using a multiple input converter (Multiple-InputConverter, MIC) to replace the United Power Supply System in new energy of a plurality of singleinput converter, can simplify the structure of the system, reduce the number of components andreduce the cost of the system. Among them, the isolation of multiple input converters can realize theelectrical isolation and applies widely, so this paper is based on research of multiple-input flybackconverter.Multiple-input flyback converter can realize united power supply with two forms of energy, thestructure of it is simple, and it can realize united power supply with two forms of energy, it has goodapplication prospect in the small and medium power applications.The transformer of the converterhas only a single winding, the voltage stress of a switching device can be reduced, the input sourcecan be a separate power to the load and also it can simultaneously supply power to the load. Becauseof the converter transformer leakage inductance and other parameters, the flyback transformer canproduce large voltage spikes in switch off moment, it will affect the normal work of the switch tube.Choose the circuit of absorbing the leakage inductance, and design closed-loop. Finally, this paperverifies demonstrate the validity of the theoretical analysis and the validity of the control strategy bysimulation and experiments.