PROJECT TITLE :
Theoretical Evaluation of Stability Improvement Brought by Resonant Current Loop for Paralleled LLC Converters
This paper presents a digitally master–slave controlled parallel system of multiple LLC resonant converters with an inner resonant current management loop in each module. Theoretical analysis of the stability of individual modules and the system with an inner resonant current loop is proposed based mostly on the envelop model, that reveals the principle of the performance improvement brought by the resonant current control loop. Moreover, the inner resonant current loop eliminates the differences in small-signal characteristics among totally different static operating points, thus facilitating the voltage loop design. The analysis of parallel operation and an entire control loop design guide for paralleled LLC resonant converters is presented based mostly on a small-signal model instead of on software simulation. Finally, the stability analysis and design are elaborated and verified through a 16-kW experimental system of 4 modularized LLC resonant converters.
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