The Resonance Element Design of the LLC Resonant Converter

The resonant element parameters design for LLC resonant converter has an important affect to the converter performance.To solve the problems of the voltage gain nonlinear changes,the switching frequency is too large when it works in light load,combined the characteristic analysis of converter,a series of constraint conditions for resonance element parameters are showed.On the basis of this,the paper summarizes the resonant network design steps of inductance,capacitance,and transformer parameters selection methods.The experimental results from one 500 W LLC converter show that the proposed design method is feasible,it is possible to meet the design requirements.