Study on crosstalk in inductive transmission of power and information

In previous papers, the authors introduced the wireless transmission of power and information (WTPI). This paper describes the most important issue for realizing the WTPI, which is how to ensure reliable transmission by reducing the crosstalk from the power-to-data channel. Crosstalk analysis is made with the following steps after the review of the WTPI technology: (1) magnetic flux distribution in the coaxial WTPI coupling is assumed; (2) an equivalent circuit is drawn by introduction of the crosstalk coefficient K_ct; and (3) according to the equivalent circuit, the crosstalk ratio CR is calculated and the induced noise level is estimated. Thereafter, the following three possible countermeasures to reduce crosstalk are proposed: (1) appropriate magnetic core dimensioning for the coupling; (2) reduction of high-frequency harmonics in the power inverter output voltage; and (3) magnetic shielding. Lastly, test results on concurrent transmission with the combination of these countermeasures are shown