This paper proposes a new method to reduce 120Hz output voltage ripple of LLC converter using resonant voltage controller. This method can reduce the 120Hz output voltage ripple with very high gain at this frequency by the resonant controller with previous PI voltage controller. The reason why the voltage ripple can be reduced is explained by the Bode diagram comparing with the previous PI controller. The simulation with Matlab/Simulink is carried out for this resonant controller and the simulation results show that resonant controller can reduce the 120Hz output voltage ripple. Experiments with DSP controller also carried out and the experimental results also show that the usefulness of the proposed voltage controller.
A new method to reduce 120Hz output voltage ripple of LLC resonant converter using resonant controller is proposed in this paper. In the proposed control method, the resonant controller can give very high gain at this frequency, so it can reduce 120Hz output voltage ripple significantly. Employing the resonant controller in software, along with the conventional PI controller, the proposed technique can reduce 120Hz ripple without the additional circuit and cost. 2kW prototype experiment presents the results that verify the validity of the proposed method I.
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