Frequency Bifurcation for Enhanced Power Output in a Capacitive Wireless Power Transfer System With Two Transmitters and Two Receivers

This paper investigates the frequency bifurcation phenomenon in a multiple-input-multiple-output (MIMO) capacitive power transfer (CPT) system with two transmitters and two receivers. The study derives analytical conditions for bifurcation using the admittance matrix, enabling determination of resonant frequencies. Analytical expressions for the power gain and transducer gain are derived, and validated through SPICE simulations, showing excellent agreement. The analysis reveals that the MIMO system retains the advantages of frequency bifurcation observed in single-input-single-output and single-input-multiple-output systems, such as enhanced power output, albeit with a minor trade-off in efficiency. This work highlights the potential of leveraging frequency bifurcation to optimize MIMO CPT systems, extending the benefits of this approach to configurations with multiple transmitters and receivers.