Abstract
Communication between the primary and secondary sides is pivotal to the wireless power transfer (WPT) system. The system control commands and feedback information need simultaneous wireless information and power transfer (SWIPT). In this paper, a FSK-based SWIPT system with full-duplex communication via a shared channel is provided. Considering the complexity of the coupling relationship in this kind of full-duplex SWIPT system, this paper proposes an analysis method based on the transmission channel, studies the crosstalk between the power channel and the information channel, and between the forward and reverse transfer of information. A design method of full-duplex communication SWIPT system based on shared coupling channels is provided. A 60 W SWIPT prototype with a full-duplex communication rate of 20 kbps is built to verify the proposed method.
Highlights
IntroductionPublisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations
In the proposed simultaneous wireless information and power transfer (SWIPT) system, the origin of information interference is mainly genIn the proposed SWIPT system, the origin of information interference is mainly generated by the power carrier and two different frequencies information carriers
The bidirectional power and the full-duplex information transmit at the different frequencies through a shared channel
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The tuning method affects the current by changing the compensation parameters of the circuit, thereby achieving information transfer [32] These modulation methods have simple structures and principles, so they are easy to implement. The superimposed signal, composed of the power carrier and the information carrier is transmitted to the secondary side, and the data carrier in the superimposed signal is extracted by the demodulation module on the secondary side This method is essentially a frequency division multiplexing (FDM) technology. In full-duplex operation, the forward transmission signal and the reverse transmission signal circulate in the circuit simultaneously, and the signal is injected into the power loop, that is, there are three frequencies in the system at the same time, so there are inevitable interferences on the three coupling channels, such as the forward/reverse information.
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