Research on LLC resonant converter interleaved parallel technology

LLC series resonant converter has been widely used in modern power electronic equipments owing to its unique advantages,such as high efficiency,low EMI and convenient magnetic integration.However,the large output ripple current factor makes the LLC-SRC difficult to be applied in low output voltage and high power ratings.Fortunately,two-phase or multi-phase interleaved parallel technology should be a good alternative for this issue.But multi-phase parallel also brings a critical problem,that is the load current sharing.In this paper,a simple parallel structure was proposed for two-phase LLC interleaved parallel and the load current sharing problem was solved effectively.The 300 W prototypes validate the theoretical analysis and feasibility of the program.