Abstract
This article presents a 6.78-MHz wireless power transfer system with a structure-reconfigurable power amplifier (SR-PA) and a 0X/1X regulating rectifier. The proposed 0X/1X regulating rectifier with local-loop control achieves voltage rectification and regulation without dc-dc converter usage to improve the receiver efficiency. To further enhance the system efficiency, the proposed SR-PA with global-loop power control adjusts its power-stage structure to realize adaptive power delivery. The transmitter and receiver chips were fabricated in a 0.25- μ \textm CMOS process using 5-V devices, and the resulting system was able to regulate an output voltage of 5 V. The measurement results demonstrated an 11.2% improvement in system efficiency for a light load and a 2.7 times increase in available output power compared with the same system without transmission power control. A measured peak receiver efficiency of 92.9% and a total system efficiency of 71.5% were also demonstrated.
| Original language | English |
|---|---|
| Article number | 9259023 |
| Pages (from-to) | 2054 - 2064 |
| Number of pages | 11 |
| Journal | IEEE Journal of Solid-State Circuits |
| Volume | 56 |
| Issue number | 7 |
| DOIs | |
| State | Published - Jul 2021 |
Keywords
- Adaptive power control
- regulating rectifier
- resonant coupling
- structure-reconfigurable power amplifier (SR-PA)
- wireless power transfer (WPT)