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access icon openaccess Transmission characteristics of magnetic resonance coupling-based multi-load wireless power transmission system

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 28/09/2018, Accepted 12/10/2018, Published 19/10/2018

If the magnetic resonance coupling-based wireless power transmission system has multiple receivers, cross-coupling will occur between the transmitter and the receiver, resulting in the variation of transmission characteristics when compared with the case of a single receiver. To solve this problem, a mutual inductance coupling circuit model for double-relay and multi-load transmission system and a calculation model for mutual inductance between solenoid coils in the same plane have been built to study the transmission characteristics of the system through simulation and testing. The study results show that: the cross-coupling effect between the transmitter and the receiver will cause resonance frequency shift, or even lead to the variation of resonance frequency splitting characteristic; when compared with a single-load system, the multi-load system may increase in total transmission power and efficiency; generally, with the introduction of additional receivers, the receiving power and efficiency of the original loads will decrease; along with the increase in circuit spacing and the decrease in cross-coupling, the transmission characteristics will gradually regress to the state of a single-load system. In this article, the calculation model for mutual inductance is correct and the maximum relative error in these calculating examples is 5.28%.

Inspec keywords: solenoids; coupled circuits; magnetic resonance; inductive power transmission

Other keywords: double-relay; transmission characteristics; mutual inductance coupling circuit model; resonance frequency shift; transmission power efficiency; single receiver; transmission channel; cross-coupling effect; multiple receivers; single-load system; resonance frequency splitting characteristic; magnetic resonance coupling-based multiload WPT system; wireless power transmission system

Subjects: Electromagnetic induction; Wireless power transmission; Solenoids and electromagnets

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