A Control Method for Current Sharing in Interleaved LLC Resonant Converter

The LLC resonant converter finds widespread application in several fields. Nevertheless, its power level cannot be efficiently increased due to the limitations of the development of semiconductor and magnetic integrated component materials. One excellent answer is to interleave parallel technology....

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Bibliographic Details
Published in2024 IEEE 7th International Conference on Electronic Information and Communication Technology (ICEICT) pp. 641 - 645
Main Authors He, Yuan, Jia, Yetao, Gao, Longxiang, Xue, Wei, Yang, Yan, Gao, Tian
Format Conference Proceeding
LanguageEnglish
Published IEEE 31.07.2024
Subjects
Capacitors
Control systems
current sharing
DC-DC power converters
LLC resonant converter
MATLAB/SIMULINK
Resonant converters
RLC circuits
Simulation
switch-controlled capacitor (SCC)
Switches
Switching frequency
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Summary:The LLC resonant converter finds widespread application in several fields. Nevertheless, its power level cannot be efficiently increased due to the limitations of the development of semiconductor and magnetic integrated component materials. One excellent answer is to interleave parallel technology. However, load imbalance originating from manufacturing imperfections in the components happens in the resonance tank when all of the interleaved LLC's modules run at the same switching frequency. This research suggests a load current sharing technique for the mismatch of each phase resonant circuit to address this issue. First, the LLC resonant converter's mathematical model is created using the fundamental analysis approach. Then, in order to offset the gain inaccuracy caused by differences in the resonant element and to distribute the load current equally throughout each module, a controller is built that modifies the resonant frequency by regulating the conduction time of the switch-control capacitor circuit (SCC). The control strategy enhances the system's anti-interference and speed. Finally, using a 300W model in MATLAB/Simulink, the simulation results confirm that the suggested control technique is feasible.
ISSN:2836-7782
DOI:10.1109/ICEICT61637.2024.10671157