Master-slave control strategy for input-series output-parallel connected flyback converters

The main advantage of the master-slave control strategy of series-parallel connected DC/DC converters is that the system is of advanced structure, practical functions, convenient maintenance and better extendibility. However the strategy is mainly used in the input-parallel output-parallel (IPOP) converters, which can balance the currents efficiently. This paper proposes a master/slave control strategy for input-series output-parallel (ISOP) connected flyback converters which can balance both output currents and input voltages simultaneously. Compared with the previous series-parallel systems, the structure of this system is simpler, the cost is lower, the volume is smaller and the efficiency is higher. The proposed system is suitable for application in the DC power grid whose input voltage and output current are large. This strategy is theoretically analyzed and verified by simulation, and the simulation results are given and discussed.