Abstract
With the rapid development of wireless power transfer (WPT) technology, the traditional single-transceiver WPT system has become more and more advanced; however, it is still difficult to meet its extensive application requirements. Aiming at the wireless charging of mobile phones in public places, electric vehicles (EVs) in multistorey garages, and electronic shelf labels (ESLs) in supermarket merchandise shelves, a multireceiver wireless power supply system with power equalization is proposed. The condition of power equalization is derived according to the equivalent circuit of the proposed WPT system, and the received power can be equally maintained by adjusting the transceiver loop resistance when the total load number or transmission distance changes. A simulation model is established to evaluate the electromagnetic environment of the proposed WPT system, and the results comply with the electromagnetic safety of the ICNIRP-2018 guidelines. Finally, the experimental results show that the power differential rate that meets the power equalization condition is 13 to 17% lower than that of the unsatisfied rate, which verifies the effectiveness of the proposed system in terms of power equalization.
Highlights
In recent years, wireless power transfer (WPT) technology has attracted widespread attention and research due to its safe and convenient characteristics [1,2]
The technology has been successfully used in consumer electronics, electric vehicles, implantable devices, etc., [3,4,5]
For a multireceiver WPT system with loads, the distribution and control of received power is the focus of this research [7]
Summary
Wireless power transfer (WPT) technology has attracted widespread attention and research due to its safe and convenient characteristics [1,2]. It is necessary to maximize system efficiency while meeting the power requirements of each load [9] External factors, such as changes in transmission distance and load, may lead to the power received becoming unstable, which will cause great damage to the electrical equipment. To solve this problem, researchers have studied various techniques. Assuming that the transmitter current is ITX, the magnetic flux on the receive be obtained by the following formula: ΦS=MP ×ITX power supplied by the front-end driver and cause potential safety hazards. The Kirchhoff VoTlthaegKe iLrcahwhsof(fKVVoLlt)aegqeuLaatwiosn(sKfVorL)theequfiartsitolnasyfeorrotfhtehfiertsrtalnaysmeriottfetrhceotirla, nsmitter coil, for each layer of tfahoserfroeealllcaohywltsar:yaenrsomf itthteerrecloaiyl, tarnandsfmoritttherecroeicl,eaivnedrfcooriltshearreecleisivteedr,croeislspaercetilvisetleyd,, respectively, as follows: US 0
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