High Q-factor WPT system with negative impedance converter

Se Hwa Yoon, Tae Hyung Kim, Jong Gwan Yook, Gi Ho Yun, Woong Yong Lee

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

8 Citations (Scopus)


The high Q-factor coil with negative impedance converter (NIC) is investigated. The NIC leads to the enhanced transmission efficiency at a long distance for wireless power transfer (WPT) with magnetic resonance coupling method. The negative resistance generated by the NIC reduces the resistance of the coil. The coils were considered for the practical application such as effects of the ferrite and conductor. The transmitter (TX coil) is presented 250 mm by 250 mm with thickness of 0.9 mm, and has the impedance of 20+j1480 Ohm and the Q-factor of 76. The Q-factor of the TX coil was enhanced from 76 to 1640 due to the negative resistance of 15 Ohm, which was about 21 times higher than that of the conventional one. The power transmission efficiency (PTE) was measured with respect to the transmission distance between the TX and RX coils. The PTE of the system was 29% at a distance of 300 mm. This result shows that the PTE was greatly improved at a long distance when the NIC was applied.

Original languageEnglish
Title of host publicationWPTC 2017 - Wireless Power Transfer Conference
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781509045853
Publication statusPublished - 2017 Jun 19
Event2017 Wireless Power Transfer Conference, WPTC 2017 - Taipei, Taiwan, Province of China
Duration: 2017 May 102017 May 12

Publication series

NameWPTC 2017 - Wireless Power Transfer Conference


Other2017 Wireless Power Transfer Conference, WPTC 2017
Country/TerritoryTaiwan, Province of China

Bibliographical note

Publisher Copyright:
© 2017 IEEE.

All Science Journal Classification (ASJC) codes

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


Dive into the research topics of 'High Q-factor WPT system with negative impedance converter'. Together they form a unique fingerprint.

Cite this