Half-Turn LLC-DCX Based Two-Stage DC-DC Converter for Wide Input Voltage Range Applications

Compared with the traditional single-stage converter architecture, the two-stage architecture has the advantage of being able to maintain high efficiency over the full input voltage range. However, in low voltage and high output current applications, the Buck+LLC-DCX based two-stage solution could n...

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Bibliographic Details
Published in2024 IEEE 7th International Electrical and Energy Conference (CIEEC) pp. 1396 - 1400
Main Authors Li, Xiaobin, Ma, Hongbo, Qiu, Zhongcai
Format Conference Proceeding
LanguageEnglish
Published IEEE 10.05.2024
Subjects
Boost cascaded half-turn LLC-DCX
Frequency conversion
high efficiency
Low voltage
Prototypes
Rectifiers
Topology
Transformers
Wide input voltage rnage
Windings
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Summary:Compared with the traditional single-stage converter architecture, the two-stage architecture has the advantage of being able to maintain high efficiency over the full input voltage range. However, in low voltage and high output current applications, the Buck+LLC-DCX based two-stage solution could not maintain high efficiency with the increasing of power level due to the low middle bus voltage. Thus, a Boost+LLC-DCX based two-stage converter is employed to reduce the conduction loss and improve efficiency. In addition, to further reduce the conduction losses at the secondary side of LLC-DCX converter, a half-turn transformer is adopted. Furthermore, the implementation and optimization of the half-turn transformer have been carried out. A 200-400V input, 28V/1.8kW output prototype has been fabricated in the lab. The experimental results show that the full load efficiency of the prototype is higher than 94%.
DOI:10.1109/CIEEC60922.2024.10583250