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1-W 3.3–16.3-V Boosting Wireless Power Transfer Circuits With Vector Summing Power Controller

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4 Author(s)
Tomita, K. ; Dept. of Electron. & Electr. Eng., Keio Univ., Yokohama, Japan ; Shinoda, R. ; Kuroda, T. ; Ishikuro, H.

This paper presents SD-card-size wireless power transfer system for large-volume contactless memory cards. Voltage is boosted simultaneously with power transfer, which eliminates the dc-dc converter or charge-pump circuit for data write operation into the flash memory chip. The proposed approach reduces the number of components and BOM cost and improves the total power efficiency. A vector summing technique is proposed to control the transmitting power and secondary side voltage. The transmitter and rectifier have been designed and fabricated using 0.18-μ m-CMOS with high voltage option. Voltage boost from 3.3 to 16.3 V and 1-W power transfer with 50% total efficiency have been successfully demonstrated, and the response time for the power control loop is shorter than 35 μs .

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:47 ,  Issue: 11 )