A New Simultaneous Wireless Power and Information Transfer System With Integrated Signal Magnetic Coupler

Abstract

For a reliable and controllable wireless power transfer (WPT) system, the simultaneous wireless power and information transfer (SWPIT) technology has recently attracted special consideration to achieve real-time information exchange between the transmitter and receiver. In this article, a novel SWPIT system with an integrated signal magnetic coupler is proposed for wireless charging applications. The signal detection coil integrated with the receiver coil is designed to utilize the existing ferrite cores of the magnetic coupler, reducing the overall cost and obtaining a more compact design. Meanwhile, the deviation frequency enlargement effect (DFEE) principle and the frequency shift keying (FSK) technology are used to realize SWPIT in a wireless charger. The equivalent circuit of the proposed system is modeled and analyzed considering the cross-couplings between the integrated signal coil and the main coils. The finite element analysis (FEA) is presented through Ansys Maxwell software to select the optimal ferrite core structure and eliminate these unwanted cross-couplings. Finally, a 70- <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$W$</tex-math></inline-formula> power experimental prototype is established, and comprehensive experimental results are given to verify the feasibility and effectiveness of the proposed SWPIT system. Furthermore, the experimental results demonstrate that the measured output power fluctuation is below 0.5 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\%$</tex-math></inline-formula> during information transmission, the transmission rate is up to 9.6 kbps, and the system efficiency can be maintained at 88.76 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\%$</tex-math></inline-formula> .