Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 36, Issue 8, Pages 8607-8611Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2021.3054768
Keywords
Clamps; Batteries; Wireless communication; Threshold voltage; Topology; Soft switching; Voltage control; Battery charging; constant current (CC); constant voltage (CV); inductive power transfer (IPT); passive solution
Categories
Funding
- National Natural Science Foundation of China [52077038, 52007067]
- Natural Science Foundation of Jiangsu Province [BK20181280]
- Fundamental Research Funds forCentral Universities of China
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The novel clamp coil assisted IPT battery charger proposed in this letter features an inherent, passive, automatic, and smooth CC-to-CV transition, which eliminates the necessity of state-of-charge detection and active control, making it rugged and reliable. Minimalist design and near-unity power factor make it suitable for wireless onboard charging applications, with experiment results validating its capability.
A constant current (CC) output followed by a constant voltage (CV) threshold is usually needed for an inductive power transfer (IPT) charger to comply with the battery charging profile. This letter proposes a novel clamp coil assisted IPT battery charger that features inherent, passive, automatic, and smooth CC-to-CV transition. Since the CC-to-CV transition eliminates the necessity of state-of-charge detection, wireless feedback communication, and active control, the proposed IPT charger is rugged and reliable. The inherent CC-to-CV transition capability also tackles the open-circuit risk during a CC charging process. As minimalist design is achieved in the secondary, the proposed IPT charger is suitable for wireless onboard charging applications. Near-unity power factor design is also considered to minimize the voltage-ampere rating and permits soft switching. Experiment results validate the inherent CC-to-CV transition capability.
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