Abstract
This paper proposes a dual-band wireless power transfer (DWPT) system which can deliver more power compared to a single-band WPT within the electromagnetic field constraints. Moreover, one of its channels can be applied to increase the data transfer rate compared to a single-band WPT. In this work because of less crosstalk between distinct frequencies, a dual-resonant single-coil is used similarly as a transmitter and receiver. The main challenge in the design of conventional DWPT systems is the simultaneous impedance matching at the different resonant frequencies. In the proposed method, this problem has been solved by varying the coupling factor between the source (load) and the dual-band internal resonator. Moreover, we analytically investigate the influence of the different values of the source(load) inductance on impedance matching. The system equivalent circuit model is presented, and the voltage transfer function and the matching condition for transmitting maximum power are extracted. To evaluate the system performance, the power transfer efficiency is simulated by HFSS software and validated by experimental results. The measurement results show the efficiency of 71% and 56% at frequencies of 6.78 MHz and 13.56 MHz, respectively.
Published Version
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