High Q-Factor Coil with Transistorized Negative Impedance Converter for Mobile Applications

Tae Hyung Kim, Gi Ho Yun, Jong Gwan Yook

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The quality factor (Q -factor) of a coil can be improved by using a negative impedance converter (NIC) with transistors. Wireless power transfer (WPT) system with the high Q -factor coil can have extremely enhanced power transfer efficiency (PTE) and received power at the receiver side. The NIC is composed of a bipolar junction transistor (BJT), a voltage divider, a resonance circuit, elements for impedance matching, and a tunable impedance. The negative impedance at 6.78 MHz can be obtained by using the tunable impedance in the NIC, and it can be adjusted as desired by the user. As a result, the loss of the transmitting coil is significantly reduced from 2 Omega to 0.1 Omega The Q -factor of the coil is enhanced from 370 to 7,067, which is 19.1 times higher than that of the typical coil. The measured PTE is 96% and 79% at a transmission distance of 50 and 200 mm, respectively. Hence, the performance of a WPT system, which uses an NIC with a BJT, demonstrates that it can be applied to mobile applications.

Original languageEnglish
Title of host publication2019 IEEE Wireless Power Transfer Conference, WPTC 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages63-66
Number of pages4
ISBN (Electronic)9781728107059
DOIs
Publication statusPublished - 2019 Jun
Event2019 IEEE Wireless Power Transfer Conference, WPTC 2019 - London, United Kingdom
Duration: 2019 Jun 182019 Jun 21

Publication series

Name2019 IEEE Wireless Power Transfer Conference, WPTC 2019

Conference

Conference2019 IEEE Wireless Power Transfer Conference, WPTC 2019
CountryUnited Kingdom
CityLondon
Period19/6/1819/6/21

All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering
  • Instrumentation

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  • Cite this

    Kim, T. H., Yun, G. H., & Yook, J. G. (2019). High Q-Factor Coil with Transistorized Negative Impedance Converter for Mobile Applications. In 2019 IEEE Wireless Power Transfer Conference, WPTC 2019 (pp. 63-66). [9055596] (2019 IEEE Wireless Power Transfer Conference, WPTC 2019). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/WPTC45513.2019.9055596