Quasi-fixed frequency controlled phase modulation LCC resonant converter with a wide power range

The research on LCC resonant converters has become increasingly popular since the application of the zero-voltage switching can improve the transmission ability and ensure the high efficiency of the power supplies. In this article, a novel quasi-definite frequency-based modulation control method to extend the excellent properties of LCC resonators to a wide range of powers is introduced. By adjusting the frequency and phase in a bidirectional manner in accordance with the design law, excellent output performance can be maintained over a wide power range, which is overcome by adjusting the switching frequency and phase separately in conventional modulation methods. In order to justify the effectiveness of the proposed modulation control method, a simulation and experimental platform of LCC resonators using the proposed modulation method was performed. Simulation and experimental results can effectively demonstrate the performance of the proposed modulation control method for a variety of input voltage and output power cases, and the efficiency of the LCC converters will be improved in higher power systems.