• Title/Summary/Keyword: CC-CV charging profile

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A 6.78 MHz Constant Current and Constant Voltage Wireless Charger for E-mobility Applications (E-모빌리티 응용을 위한 6.78MHz 정전압 정전류 무선 충전기)

  • Tran, Manh Tuan;Choi, Woojin
    • Proceedings of the KIPE Conference
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    • 2019.07a
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    • pp.142-144
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    • 2019
  • Nowadays, multi-MHz wireless power transfer (WPT) system has received a great concern of study due to its desirable characteristics such as user convenience, system compact and better safety as compared to the conventional DC-DC with cord. This paper presents a solution for WPT Lithium Batteries charger with Constant Current (CC) and Constant Voltage (CV) charging process. The proposed system consists of a high frequency class D power amplifier, a pair of PCB coil, transformable high-order resonant network and a full-bridge rectifier. The charger can be implemented CC /CV charging profile thanks to automatic reconfigurable resonant compensator. Therefore, the battery can be fully charged without the help of an additional DC/DC converter. The simulation and 50W-6.78-MHz hardware experimental results are presented to verify the feasibility of the proposed method and to evaluate the performance of the proposed wireless battery charger.

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Design of an Integrated Current-Voltage Charging Compensator for the LLC Resonant Converter-Based Li-ion Battery Charger (LLC 공진형 컨버터 기반 리튬이온 배터리 충전기의 통합 전류-전압 보상기 설계방법 연구)

  • Choi, Yeong-Jun;Choi, See-Young;Kim, Rae-Young
    • The Transactions of the Korean Institute of Power Electronics
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    • v.22 no.2
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    • pp.126-133
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    • 2017
  • 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.