1-W 3.3-16.3-V boosting wireless power transfer circuits with vector summing power controller

Kazutoshi Tomita, Ryota Shinoda, Tadahiro Kuroda, Hiroki Ishikuro

Research output: Contribution to journalArticle

30 Citations (Scopus)


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 languageEnglish
Article number6301783
Pages (from-to)2576-2585
Number of pages10
JournalIEEE Journal of Solid-State Circuits
Issue number11
Publication statusPublished - 2012



  • Coils
  • memory card
  • MOS devices
  • power control
  • voltage control
  • voltage-boosting circuits
  • wireless power transmission

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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