This paper proposes the first simultaneous wireless power and data transfer (SWPDT) integrated circuit (IC) which exploits a Capacitive-Inductive Channel (CI-Channel), enabling concurrent power and data transmission. The communication across the CI-Channel can support data-only transmission or can be incorporated into the system control loop, allowing output voltage regulation through phase-shift control applied at the primary side. The proposed IC can be configured as primary side (power transmitter, P-TX, and data receiver, RX) or secondary side (power receiver, P-RX, and data transmitter, TX). In order to ensure communication robustness, unwanted disturbances are removed through specifically designed Power Blanking and Ringing Blanking circuits. The proposed SWPDT IC test-chip prototype was fabricated using a 130-nm BCD process and experimentally verified considering the complete wireless power transfer (WPT) system, including primary side, CI-Channel and secondary side. The overall system, targeting medium-power industrial applications, achieves a maximum 5.3-W output power, a peak efficiency of 83.7% and a load regulation of 0.09 mV/mA. Moreover, a 540 kb/s data rate with no transmission errors across$10^{9}$bit acquisitions, corresponding to a bit-error-rate (BER)$\lt 10^{-9}$, was achieved.

This paper focuses on control techniques for an integrated Dual Active Bridge (DAB) converter designed for low-voltage (5V) and low-power (2W) applications. The analysis concentrates on the single-phase-shift (SPS) modulation, as it offers the best balance between implementation simplicity and power efficiency for a control loop circuit that must be embedded within the system. Moreover, an innovative modulation technique called controlled single-phase-shift (CSPS) is introduced, which dynamically adjusts the phase-shift to maximize current flow through the load. This approach enhances the output power range by 33%, achieving an increase in the average efficiency throughout the phase-shift interval up to 4% when compared to the conventional SPS modulation. Circuit-level simulations have been conducted in Cadence Virtuoso environment to verify the effectiveness of the proposed approach.

This paper presents a novel capacitive-inductive structure implementing the channel for power and data transmission in a wireless power transfer system. The structure consists of two$24-\mu\mathrm{H}$coil inductors, each surrounded with an open ring copper layer realized on a printed circuit board (PCB). The proposed channel structure allows simultaneous transmission of power and data: indeed power is transferred through the magnetic field generated by the coils, while data are modulated and transferred through the electric field produced by the capacitance determined by the copper rings and the parasitic capacitance of the two coils. The proposed structure was extensively studied and characterized both through simulations and measurements: compared to the state-of-the-art, in which metal plates placed below the coils are employed for implementing the capacitance used for data transmission, it shows a significant decrease in parasitic capacitance between the copper ring and the coil, thus reducing power disturbances on the data transmission.