Abstract
Wireless charging of electric vehicles is achieved by a resonance-enhanced inductive power transfer technique. In this paper, a new method is proposed for the estimation of the operating frequency under the contingency of misalignment of the pickup coil. Analytically, the mutual inductance between the primary and secondary coils is represented in terms of their vertical and horizontal displacements, using Neumann’s approximation formula. The operating frequency of the high-frequency inverter corresponds to the resonance condition, a function of the mutual inductance, which is decided by the coil misalignment. The obtained relations are corroborated with studies of simulations. The proposed method is validated by numerical simulation. A 1 kW experimental prototype is designed and tested. Experimental results corroborate the notion about the analytical expression.
Highlights
The inductive power transfer (IPT) technique is one of the most efficient near-field power transfer methods [1,2,3,4,5]
Wireless charging of electronic gadgets, electric vehicles, and biomedical applications are under its control
The invention of an efficient IPT system opens a way to charge through wireless means [6,7,8,9]
Summary
The inductive power transfer (IPT) technique is one of the most efficient near-field power transfer methods [1,2,3,4,5]. Resonance-enhanced IPT topologies are efficient for power transfer and will improve the distance of power transfer from primary to the secondary [6,16]. The optimal operating frequency for maximum power transfer has been estimated under the contingency of misalignment in the IPT system. In this proposed method, the misalignment is computed based on analytical expressions and corroborated by numerical simulation results. The optimal operating frequency corresponding to maximum power transfer from primary to secondary has been identified in this study
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