LLC converter is now used in the electric vehicle charger for excellent efficiency characteristics.In the other hand its narrow voltage gain characteristics impede its being widely used.The loss of LLC converter are analyzed with different working condition in the paper.And then one hybrid controller is introduced which combine with the sub-resonant-frequency FM mode fixed switching frequency and super-resonant-frequency FM mode to get high efficiency in wide voltage range.The equivalent efficiency with different subsection parameters control strategies are compared by loss calculation.Finally three control strategy are applied in a 10 kW LLC converter prototypes to verify the design method.