Primary-Side Dual-Control Architecture for Multi-Channel Simultaneous Wireless Information and Power Transfer Systems for Cobot Application

This paper introduces a primary-side dual-control architecture designed for multi-channel simultaneous wireless information and power transfer (SWIPT) systems featuring a digital communication channel suited for a cobot application. Conventional multi-channel SWIPT control systems employ phase-shift approach and transmit the scaled output voltage through the digital channel, requiring precise signal reconstruction. In contrast, the transmitted signal of the proposed architecture is the output of the error amplifier, whose crucial feature lies in its temporal dynamics rather than its specific DC value, enhancing system robustness against transmission errors. The architecture was developed and validated through simulations conducted with SIMPLIS software. The simulation results demonstrate the better power efficiency of the proposed dual-control setup compared to the phase-shift configuration, especially under light-load conditions, where switching losses are magnified. Indeed, the dual-control method optimizes power switch performance by applying Zero-Voltage-Switching and Zero-Current-Switching, ensuring soft-switching and reducing switching losses.