Abstract
Electric vehicles have gained more and more attention because of the serious oil crisis and environmental problems. However, the disadvantages of the electric vehicle, such as short driving range, high battery cost, and inconvenient charging, are hindering its market development and expansion. The realization of on-road wireless power transfer technology can effectively solve the problems of short driving range, prevent the battery from being completely discharged to prolong its service life, and reduce requirement of on-board battery. In this paper, the charging mode and the compensation topology of wireless power transfer technology are discussed and then the equivalent circuit model of segmental wireless power transfer system is built. We carried out some magnetic field simulation to analyze how the track shape and length influence coupling coefficient, which is later verified by experiments.
Highlights
Wireless power transfer technology, which is safe, robust, reliable, and convenient compared with conventional conductive charging method, can help to improve consumers’ charging experience and promote expansion of the electric vehicle (EV) market greatly
Inductive power transfer technology is widely adopted in dynamic wireless power transfer system because it has a better compromise between the working frequency, transfer distance, power level, and system efficiency than other technologies, taking electric field resonance for example of which working frequency reaches up to 2 MHz [1]
The inductive dynamic wireless power transfer track can be sorted into lumped track and stretched track
Summary
Wireless power transfer technology, which is safe, robust, reliable, and convenient compared with conventional conductive charging method, can help to improve consumers’ charging experience and promote expansion of the electric vehicle (EV) market greatly. Stretched track can be further divided into single-loop track and segmental track, both allow multi pickups being coupled simultaneously and have the merit of less electric convert and control devices and less cost for a given length charging road The former suffers from the low coupling coefficient and serious electromagnetic field (EMF) problem due to large leakage flux. An optimization algorithm with the objective to minimize the investment cost by diminishing the utilized ferrite material is proposed by KAIST recently and it has proved the feasibility of none ferrite track theoretically [15] Another problem of the single-loop track is reliability, because it utilizes an integrated circuit and control system, where a failure of one component will lead to unavailability of the entire charging system. The track length of primary track was studied mainly by taking system stability into account and the paper is organized as follows: The basic compensation topologies and system circuit model is analyzed in Section 2; In Section 3, circuit simulation was carried out to verify the correctness of theory analysis at first, and the magnetic field simulation with FEA (finite element analysis) model and track analysis are elaborated; Experimental verification is presented in Section 4, while some conclusions are summarized in Section 5 at last
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