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http://dx.doi.org/10.6113/TKPE.2017.22.2.126

Design of an Integrated Current-Voltage Charging Compensator for the LLC Resonant Converter-Based Li-ion Battery Charger  

Choi, Yeong-Jun (Dept. of Electrical Eng., HYPEC-EECS lab., Hanyang University)
Choi, See-Young (Dept. of Electrical Eng., HYPEC-EECS lab., Hanyang University)
Kim, Rae-Young (Dept. of Electrical Eng., HYPEC-EECS lab., Hanyang University)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.22, no.2, 2017 , pp. 126-133 More about this Journal
Abstract
The conventional battery charger requires two separate voltage and current compensators to achieve constant current and constant-current-charging profile. This compensator configuration leads to an inevitable transient response during the mode change between the constant current and the constant voltage operation. Futhermore, a tedious and complicated design process is required to consider a widely changing battery voltage and the nonlinear electrical properties of Li-ion battery. This study proposes a single integrated voltage-current compensator of the LLC resonant converter for Li-ion battery charger applications to overcome the aforementioned drawbacks. The proposed compensator is designed to provide a smooth and reliable performance during the entire charging process while providing the reduced design efforts and seamless mode transient response. Several experimental results based on a 300 W prototype converter and its theoretical analysis are provided to verify the effectiveness of the proposed compensator.
Keywords
LLC resonant converter; Battery charger; Integrated compensator; CC-CV charging profile;
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