Resonant Parameters Optimization Design for Improving Operation Performance of LCC-type Resonant Converter

Featuring better output voltage regulation performance and better reliability with short-circuit or open-circuit condition, the LCC-type resonant converter became favorable in high-voltage dc power supply. Traditionally, LCC-type resonant converter was more widely used under discontinuous current mode. However, when requires steady, highly sinusoidal voltage, there would be no rectifier and the converter should operate in continuous current mode. This paper will focus on investigating the relationship between resonant parameters and the output voltage, resonant current and switching performance through theoretical analysis and simulation. Three main resonant parameters, including series resonant filter parameters, parallel resonant capacitance and primary series inductance, were chosen based on theoretical analysis. Then the relationship would be verified by sets of experiments based on a prototype of the proposed LCC-type resonant converter. Finally, the resonant parameters would be optimized and the improvement of system performance after parameter optimization would be validated.