Abstract
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.
Original language | English |
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Article number | 6301783 |
Pages (from-to) | 2576-2585 |
Number of pages | 10 |
Journal | IEEE Journal of Solid-State Circuits |
Volume | 47 |
Issue number | 11 |
DOIs | |
Publication status | Published - 2012 Sep 18 |
Keywords
- Coils
- MOS devices
- memory card
- power control
- voltage control
- voltage-boosting circuits
- wireless power transmission
ASJC Scopus subject areas
- Electrical and Electronic Engineering