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In order to solve the problem that there are many resonant elements and it is difficult to design the full bridge CLLLC resonant converter, an improved resonant network parameter design method combined with simulation analysis is proposed in this paper. Accurate DC voltage gain curves are obtained under different resonant parameters. A 3.5 kW simulation circuit is constructed based on the parameters of the proposed method. The simulation results confirm the correctness and feasibility of the proposed improved design method.