A novel current driving scheme for LLC resonant converter with Synchronized voltage-doubler rectifier

This paper proposes a novel current driving scheme for synchronous rectifier (SR) in the LLC resonant converter with a voltage doubler rectifier structure. In the proposed current driving scheme, a simple current transformer (CT) with only one secondary winding is used to drive two SRs in the voltage doubler rectifier. Furthermore, the reflected current from the CT will feed to the output. Therefore, the proposed current driving scheme features simple structure, low power loss and good performance. A prototype with 300-400V input and 16V/5.6A output is built to verify the theoretical analysis.