Wireless power charger for wearable medical devices with in-band communication

Young Jin Moon, Jeongpyo Park, Mingyu Jeong, Sang Hyun Kim, Jin Gyu Kang, Dong Zo Kim, Changsik Yoo

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

A wireless power charger integrated circuit has been developed for wearable medical devices in a 0.18-µm Bipolar, Complementary metal-oxide-semiconductor, and Lightly-Doped Metal-Oxide-Semiconductor (BCDMOS) process. A passive full-wave rectifier consisting of Schottky diodes and cross-coupled n-type Metal-Oxide-Semiconductor (nMOS) transistors performs the alternating current to direct current power conversion without any reverse leakage current. To charge a battery, a linear charger circuit follows the passive rectifier instead of a switching charger circuit for the small form factor of wearable medical devices. An in-band communication circuit notifies the proper connection of the wireless power receiver and the battery charging status to the charging pad (wireless power transmitter) through the wireless power transmission channel. The wireless power charger integrated circuit occupies 1.44-mm2 silicon area and shows 31.7% power efficiency when the charging current is 26.6 mA.

Original languageEnglish
Pages (from-to)1483-1493
Number of pages11
JournalInternational Journal of Circuit Theory and Applications
Volume44
Issue number8
DOIs
StatePublished - 2016 Aug 1

Keywords

  • BCDMOS
  • battery charger
  • in-band communication
  • medical device
  • rectifier
  • wireless power transmission

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