Analysis of the efficiency characteristics of an LLC resonant converter having a current doubler rectification circuit

Present study analyzed the efficiency characteristics of LLC converters having current doubler rectification circuits. A current doubler rectification circuit has a coupled inductor as rectification circuit on the secondary side output terminal of the converter. A current doubler rectification circuit generally requires inductors on the secondary side however, the characteristic of an LLC converter preclude the inclusion of inductors on its secondary side. This problem is resolved here by proposing, a circuit system that has very small inductance values and uses a coupled inductor on the secondary side output terminal. The proposed circuit system is advantageous compared to center tap systems typically used at present, as confirmed by analysis and verified through simulated analysis.