Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 34, Issue 4, Pages 3110-3123Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2018.2850838
Keywords
Concentrated magnetic field; inductive power transfer (IPT); magnetic design; misalignment tolerance; primary series; secondary series-parallel (S/SP) compensation topology
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Funding
- National Natural Science Foundation of China [51677034]
- Fundamental Research Funds for the Central Universities [HIT.BRETIII.201510]
- National High Technology Research and Development Program 863 of China [2015AA050603]
- Natural Science Foundation of Heilongjiang Province of China [ZD2018012]
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The capability of misalignment tolerance is vital for an inductive power transfer system. This paper proposes a novel unsymmetrical coupling structure that can remarkably enhance the output voltage stability with respect to the horizontal, vertical, and angular displacements. The core of this structure is concentrated magnetic field. The optimization method to derive the optimal loosely coupled transformer providing the strongest tolerance to misalignment and fulfilling the requirement of the minimum coupling coefficient is presented. The proposed structure is compared with planar circular and square coils and double-D (DD) coupler from the perspectives of magnetic coupling and antimisalignment capability. A 200-W prototype is finally fabricated, where the primary series, secondary series-parallel compensation topology is employed to further improve the system's tolerance to misalignment. A maximum output voltage ripple factor of 2.83% and a minimum system efficiency of 91.9% are achieved when the horizontal displacement is as high as one-third of the coupling coil.
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