An adaptive reconfigurable active voltage doubler/rectifier for extended-range inductive power transmission

Hyung Min Lee, Maysam Ghovanloo

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

We present an adaptive reconfigurable active voltage doubler (VD)/rectifier (REC) (VD/REC) in standard CMOS, which can adaptively change its topology to either a VD or a REC by sensing the output voltage, leading to more robust inductive power transmission over an extended range. Both active VD and REC modes provide much lower dropout voltage and far better power conversion efficiency (PCE) compared to their passive counterparts by adopting offset-controlled high-speed comparators that drive the rectifying switches at proper times in the high-frequency band. We have fabricated the active VD/REC in a 0.5-μm 3-metal 2-poly CMOS process, occupying 0.585 mm 2 of chip area. In an exemplar setup, VD/REC extended the power transmission range by 33% (from 6 to 8 cm) in relative coil distance and 41.5% (from 53° to 75°) in relative coil orientation compared to using the REC alone. While providing 3.1-V dc output across a 500-$\Omega$ load from 2.15- (VD) and 3.7-V (REC) peak ac inputs at 13.56 MHz, VD/REC achieved measured PCEs of 70% and 77%, respectively.

Original languageEnglish
Article number6236106
Pages (from-to)481-485
Number of pages5
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
Volume59
Issue number8
DOIs
Publication statusPublished - 2012
Externally publishedYes

Keywords

  • Active rectifier (REC)
  • active voltage doubler (VD)
  • adaptive control
  • high-speed comparators
  • implantable microelectronic devices (IMDs)
  • inductive power transmission
  • near field

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'An adaptive reconfigurable active voltage doubler/rectifier for extended-range inductive power transmission'. Together they form a unique fingerprint.

Cite this