2022 IEEE 3rd China International Youth Conference on Electrical Engineering (CIYCEE 2022)

71 / 2022-06-29 19:50:51

Variable-frequency Multi-phase-shift Control Strategy for Wide-range Bidirectional Resonant Converter Considering Detuning

bidirectional CLLLC resonant converter,variable-frequency control,multi-phase-shift control

Power Electronics Technology and Application > Control, modeling, and optimization of power converter

The CLLLC resonant converter naturally has symmetrical bidirectional power transmission characteristics due to its symmetrical circuit structure, but the transmission power and efficiency will be reduced when resonant network is detuned. In this paper, a mathematical model for the CLLLC resonant converter is established based on the first harmonic approximation(FHA) method. Then, a variable-frequency multi-phase-shift control strategy that can achieve bidirectional power transfer over a wide voltage range and reduce the adverse effects of detuning of the resonant network is proposed. Finally, through simulations and experiments, the proposed control strategy is proved to be able to reduce the adverse effect of detuning.