Journal
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 69, Issue 1, Pages 825-834Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2020.3048322
Keywords
Windings; Inductance; Couplings; Design methodology; Inductive charging; Equivalent circuits; Consumer electronics; Antiparallel windings (AWs); coupling coefficient variation; free positioning; inductive power transfer (IPT); misalignment tolerance; wireless power transfer (WPT)
Categories
Funding
- Singapore Maritime Institute [SMI-2019-MA-02]
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This article proposes a design methodology using antiparallel windings to mitigate the coupling coefficient variation at different positions, improving the safety of free positioning wireless charging for consumer electronics. The design methodology also enhances the efficiency of power electronics converters.
Free positioning wireless charging for consumer electronics allows the devices to be charged at arbitrary positions and angles to improve user experience. However, a user-initiated sudden movement of the device during charging can cause hazards due to the abrupt variation of the coupling coefficient. To solve this issue, the coupling coefficient variation at different positions should be mitigated, which is also good for the design and high-efficiency operation of power electronics converters. This article proposes a design methodology to employ antiparallel windings to smooth the coupling coefficient variation over different positions by reducing the coupling coefficient at central positions and enhancing it at boundary positions. Two optimization methods are proposed: turn-by-turn optimization and winding-by-winding optimization. A design flow is offered. The hexagonal coil is compared with the square coil and proved to achieve better performance than the latter. An experimental prototype is implemented to validate the effectiveness of the proposed design methodology.
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