Journal ArticleDOI
Computer-Aided Design and Optimization of High-Efficiency LLC Series Resonant Converter
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In this paper, a systematic optimization procedure was proposed to optimize LLC series resonant converter full load efficiency, which achieved an experimental full-load efficiency of 97.07% compared to a calculated 97.4% efficiency.Abstract:
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.read more
Citations
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Journal ArticleDOI
Design Methodology of LLC Resonant Converters for Electric Vehicle Battery Chargers
TL;DR: An inductor-inductor-capacitor (LLC) resonant dc-dc converter design procedure for an onboard lithium-ion battery charger of a plug-in hybrid electric vehicle (PHEV) is presented.
Journal ArticleDOI
Comparison Study on SS and Double-Sided LCC Compensation Topologies for EV/PHEV Wireless Chargers
TL;DR: The comparative result shows that the double-sided LCC compensation topology is less sensitive to mistuning, and has a peak efficiency of 96% from dc power source to battery load.
Journal ArticleDOI
A 98.3% Efficient GaN Isolated Bidirectional DC–DC Converter for DC Microgrid Energy Storage System Applications
Fei Xue,Ruiyang Yu,Alex Q. Huang +2 more
TL;DR: This paper presents a novel 400 to 12 V isolated bidirectional dc–dc converter based on a phase-shift-controlled-modified dual-active-bridge power stage, which has promising performance for low-voltage high-current applications.
Journal ArticleDOI
Optimal Design Methodology for LLC Resonant Converter in Battery Charging Applications Based on Time-Weighted Average Efficiency
TL;DR: In this paper, an LLC resonant converter design methodology for battery charging applications is proposed aiming at achieving high efficiency, which is based on the characteristics of the battery charging profiles, a new time weighted average efficiency (TWAE) index is proposed, which represents the average weight of conversion efficiency during battery charging period.
Journal ArticleDOI
Interleaved LLC Resonant Converter With Hybrid Rectifier and Variable-Frequency Plus Phase-Shift Control for Wide Output Voltage Range Applications
Hongfei Wu,Xiaohai Zhan,Yan Xing +2 more
TL;DR: In this paper, a two-phase interleaved LLC (iLLC) resonant converter with hybrid rectifier is proposed for wide output voltage range applications, where the primary sides of the two LLC converters are in parallel, and the connection of the secondary windings can be regulated by the hybrid rectifiers according to the output voltage.
References
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Proceedings ArticleDOI
Optimal design methodology for LLC resonant converter
TL;DR: In this paper, the relationship between converter efficiency and operation range with different circuit parameters has been revealed and an optimal design methodology has been developed based on the revealed relationship, and a 1MHz, 1kW LLC converter is designed to verify the proposed method.