DiTTO: A Distance Adaptive Over 100-mW Wireless Power Transfer System With 1.695-Mb/s Uplink Telemetry and a Shared Inductor Two-Output Regulating Rectification

• Published in: IEEE journal of solid-state circuits Vol. 59; no. 8; pp. 2568 - 2580
• Main Authors: Kim, Hongkyun, Park, Yechan, Sung, Changhoon, Cho, Jaeouk, Park, Seongjun, Kim, Chul
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.08.2024; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Adaptive systems; Algorithms; Biomedical electronics; Control algorithms; Control theory; Distance and load variation; electroceuticals; inductive link; Inductors; Modulation; Nervous system; regulating rectifier; shared inductor dual-output (SIDO); Telemetry; Transient response; Uplink; Uplinking; Wireless power transfer; wireless power transfer (WPT); Wireless power transmission
• ISSN: 0018-9200; 1558-173X
• DOI: 10.1109/JSSC.2024.3372418

This article presents a wireless power transfer (WPT) system that incorporates a seamless uplink data telemetry and a simultaneous shared inductor dual-output (SIDO) regulating rectification (RR) under distance variation over a single WPT link. The proposed double charging keying (DCK) uplink data modulation method assisted by a dynamic zoom control breaks the trade-off between power delivery to the load (PDL) and uplink data such that the high data-rate uplink data telemetry no longer limits the amount of PDLs. Furthermore, DCK alleviates the design difficulty in simultaneous uplink data telemetry and RR. The dynamic ZOOM-based digital control algorithm is employed to ensure reliable uplink data telemetry and rapid transient response of SIDO-RR with two <inline-formula> <tex-math notation="LaTeX">\Delta \Sigma </tex-math></inline-formula>-loops under distance variations. This work achieves 1.695-Mb/s uplink data rate while delivering up to 108 mW to two independent loads over 10-42-mm single-link distance. The chip fabricated in standard 65-nm CMOS occupies 0.2-mm2 active area and its performance is validated through in vivo experiments.