Computer-Aided Design and Optimization of High-Efficiency LLC Series Resonant Converter

High conversion efficiency is desired in switch mode power supply converters. Computer-aided design optimization is emerging as a promising way to design power converters. In this work a systematic optimization procedure is proposed to optimize LLC series resonant converter full load efficiency. A m...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2012-07, Vol.27 (7), p.3243-3256
Main Authors: Ruiyang Yu, Ho, G. K. Y., Pong, B. M. H., Ling, B. W-K, Lam, J.
Format: Article
Language:English
Subjects:
Applied sciences
CAD
Capacitors
Circuit properties
Computer aided design
efficiency
Electric currents
Electric, optical and optoelectronic circuits
Electrical engineering. Electrical power engineering
Electronic circuits
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Equations
Exact sciences and technology
Inductors
LLC resonant converter
Mathematical model
Nonlinear programming
Optimization
Optimization techniques
power converter
Power electronics, power supplies
Power supply
Resonant frequency
Signal convertors
Strontium
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Summary:High conversion efficiency is desired in switch mode power supply converters. Computer-aided design optimization is emerging as a promising way to design power converters. In this work a systematic optimization procedure is proposed to optimize LLC series resonant converter full load efficiency. A mode solver technique is proposed to handle LLC converter steady-state solutions. The mode solver utilizes numerical nonlinear programming techniques to solve LLC-state equations and determine operation mode. Loss models are provided to calculate total component losses using the current and voltage information derived from the mode solver. The calculated efficiency serves as the objective function to optimize the converter efficiency. A prototype 300-W 400-V to 12-V LLC converter is built using the optimization results. Details of design variables, boundaries, equality/inequality constraints, and loss distributions are given. An experimental full-load efficiency of 97.07% is achieved compared to a calculated 97.4% efficiency. The proposed optimization procedure is an effective way to design high-efficiency LLC converters.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2011.2179562