Abstract
This paper proposes an approximately coil inductance independent simultaneous wireless power and data transfer (SWPDT) system. Power and data are transferred simultaneously via a pair of coupling coils. The data carrier is injected into and extracted from the power transfer channel by a small inductor connected serially with the coupling coil and the data transfer channel is insensitive to the inductance of the coupling coil in a certain interval. Compound LC-LC compensation topology is added to filter the high order harmonics out of the power transfer channel and suppress the voltage stress of the power transfer channel to the data transfer channel on condition that the original characteristics of constant-voltage output of the SN topology are not affected. The circuit model is built to analyze the power and data transfer performance and the complex frequency-domain model of the system is established to analyze the responses of power interference. Finally, the feasibility of the technology proposed is verified by simulation.
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