Open loop and closed loop analysis of LLC resonant converter operating at constant switching frequency by interleaving technique

Abstract

The LLC resonant converter operating at constant switching frequency by interleaving technique has been analyzed using MATLAB/Simulink. The LLC resonant converter has the advantages of high efficiency, high power density, and low cost. They can be operated at no load condition and at resonance for nominal input voltage. The load sharing problem of LLC resonant converter has been overcome by SCC (Switch Controlled Capacitor). In interleaving technique, all the stages of LLC operate at same switching frequency for the purpose of current ripple cancellation. It has been proposed to reduce the switching losses and voltage ripple by using a PI Filter.