A Modified Gain Model and the Corresponding Design Method for an LLC Resonant Converter

In this paper, a modified gain model and the corresponding design method for an LLC resonant converter are proposed. To derive the gain model, two important factors-resonant factor and load factor are considered and discussed in detail by combining time domain and frequency domain. Compared with fun...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2017-09, Vol.32 (9), p.6716-6727
Main Authors: Jianqiang Liu, Jiepin Zhang, Zheng, Trillion Q., Jingxi Yang
Format: Article
Language:English
Subjects:
<italic xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">LLC resonant converter
Computer simulation
Concurrent engineering
Design method
Design methodology
Design modifications
fundamental harmonic approximation (FHA) method
Inductors
Load modeling
modified gain model
power electronic traction transformer (PETT)
Power electronics
Resistance
Resonant frequency
Roads & highways
Robust control
Time-domain analysis
Traction
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Summary:In this paper, a modified gain model and the corresponding design method for an LLC resonant converter are proposed. To derive the gain model, two important factors-resonant factor and load factor are considered and discussed in detail by combining time domain and frequency domain. Compared with fundamental harmonic approximation (FHA) method, the accuracy of the gain model is highly improved. Referring to the modified gain model, the corresponding design method is also obtained that can inherit conciseness and practicability of the FHA method. Thus, the design method can be used to replace the FHA method in practical design procedures. Finally, the simulation results are given and a prototype of the LLC resonant converter used for power electronic traction transformer is built to verify the accuracy and validity of the proposed gain model and the corresponding design method.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2016.2623418