Abstract
Wireless power transfer (WPT) using magnetic-coupling resonant has been proved to be a promising transmission method. At present, most of the existing resonant WPT systems adopt integer-order inductors and capacitors. In fact, in addition to integer-order components, there also exists fractional-order inductors and capacitors, which possess richer characteristics than integral-order inductors and capacitors. However, there are few studies on the application of fractional-order components in resonant WPT system. Therefore, this paper proposes a fractional-order resonant WPT system, which is based on a fractional-order resonant circuit only incorporating a fractional-order capacitor. The coupled-mode theory model of the proposed WPT system is established, and the impact of different loads and orders on transfer characteristics is explored. The theoretical analysis demonstrates that the proposed system can achieve constant current output that is independent of load, just by choosing appropriate parameters of the fractional-order capacitor. Finally, an experimental prototype of the fractional-order resonant WPT system is built, and the experiment results verify the correctness of the theoretical analysis.
Highlights
Near-field magnetic-coupling resonant wireless power transfer (WPT) is a promising alternative to traditional wired power transfer, because of its flexibility, safety, convenience [1]
WPT technology has been applied in many occasions, such as portable electronic devices, kitchen appliances, implantable medical devices, electric vehicles, lighting application and so on [2]
For the application of constant current load, such as LEDs, batteries and supercapacitors, WPT system is required to have the characteristic of constant current output [3]
Summary
Near-field magnetic-coupling resonant wireless power transfer (WPT) is a promising alternative to traditional wired power transfer, because of its flexibility, safety, convenience [1]. This paper proposes a novel fractional-order resonant WPT system with inherently constant current output. The proposed resonant WPT system contains a fractional-order capacitor (FOC) in the transmitter and the constant current properties. In [27], a FOC can help WPT system realize that the transfer efficiency and output power are insensitive to the resonant frequency. They does not give the analysis about the impact of load on output current, and can not output constant current. When designing the resonant frequency ωT, the inductance and capacitance, and the order α should be considered
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