期刊
IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS
卷 9, 期 6, 页码 875-884出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TBCAS.2015.2503418
关键词
Bio-implant; coupling and load ranges; primary equalizer; wireless power transfer (WPT)
Wireless power transfer using reconfigurable resonant regulating (R-3) rectification suffers from limited range in accommodating varying coupling and loading conditions. A primary-assisted regulation principle is proposed to mitigate these limitations, of which the amplitude of the rectifier input voltage on the secondary side is regulated by accordingly adjusting the voltage amplitude V-eq on the primary side. A novel current-sensing method and calibration scheme track V-eq on the primary side. A ramp generator simultaneously provides three clock signals for different modules. Both the primary equalizer and the R-3 rectifier are implemented as custom integrated circuits fabricated in a 0.35 mu m CMOS process, with the global control implemented in FPGA. Measurements show that with the primary equalizer, the workable coupling and loading ranges are extended by 250% at 120 mW load and 300% at 1.2 cm coil distance compared to the same system without the primary equalizer. A maximum rectifier efficiency of 92.5% and a total system efficiency of 62.4% are demonstrated.
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