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

Tae Hyung Kim; Gi Ho Yun; Jong Gwan Yook

doi:10.1109/WPTC45513.2019.9055596

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

Tae Hyung Kim, Gi Ho Yun, Jong Gwan Yook

Department of Electrical and Electronic Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference 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 language	English
Title of host publication	2019 IEEE Wireless Power Transfer Conference, WPTC 2019
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	63-66
Number of pages	4
ISBN (Electronic)	9781728107059
DOIs	https://doi.org/10.1109/WPTC45513.2019.9055596
Publication status	Published - 2019 Jun
Event	2019 IEEE Wireless Power Transfer Conference, WPTC 2019 - London, United Kingdom Duration: 2019 Jun 18 → 2019 Jun 21

Publication series

Name	2019 IEEE Wireless Power Transfer Conference, WPTC 2019

Conference

Conference	2019 IEEE Wireless Power Transfer Conference, WPTC 2019
Country/Territory	United Kingdom
City	London
Period	19/6/18 → 19/6/21

Bibliographical note

Funding Information:
This work was supported by the Technology development Program (S2665838) funded by the Ministry of SMEs and Startups (MSS, Korea)

Publisher Copyright:
© 2019 IEEE.

All Science Journal Classification (ASJC) codes

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

Access to Document

10.1109/WPTC45513.2019.9055596

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

@inproceedings{8288da199a0e49d3bec2a156d9f937dc,

title = "High Q-Factor Coil with Transistorized Negative Impedance Converter for Mobile Applications",

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.",

author = "Kim, {Tae Hyung} and Yun, {Gi Ho} and Yook, {Jong Gwan}",

note = "Funding Information: This work was supported by the Technology development Program (S2665838) funded by the Ministry of SMEs and Startups (MSS, Korea) Publisher Copyright: {\textcopyright} 2019 IEEE.; 2019 IEEE Wireless Power Transfer Conference, WPTC 2019 ; Conference date: 18-06-2019 Through 21-06-2019",

year = "2019",

month = jun,

doi = "10.1109/WPTC45513.2019.9055596",

language = "English",

series = "2019 IEEE Wireless Power Transfer Conference, WPTC 2019",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

pages = "63--66",

booktitle = "2019 IEEE Wireless Power Transfer Conference, WPTC 2019",

address = "United States",

}

Kim, TH, Yun, GH & Yook, JG 2019, High Q-Factor Coil with Transistorized Negative Impedance Converter for Mobile Applications. in 2019 IEEE Wireless Power Transfer Conference, WPTC 2019., 9055596, 2019 IEEE Wireless Power Transfer Conference, WPTC 2019, Institute of Electrical and Electronics Engineers Inc., pp. 63-66, 2019 IEEE Wireless Power Transfer Conference, WPTC 2019, London, United Kingdom, 19/6/18. https://doi.org/10.1109/WPTC45513.2019.9055596

High Q-Factor Coil with Transistorized Negative Impedance Converter for Mobile Applications. / Kim, Tae Hyung; Yun, Gi Ho; Yook, Jong Gwan.
2019 IEEE Wireless Power Transfer Conference, WPTC 2019. Institute of Electrical and Electronics Engineers Inc., 2019. p. 63-66 9055596 (2019 IEEE Wireless Power Transfer Conference, WPTC 2019).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - High Q-Factor Coil with Transistorized Negative Impedance Converter for Mobile Applications

AU - Kim, Tae Hyung

AU - Yun, Gi Ho

AU - Yook, Jong Gwan

PY - 2019/6

Y1 - 2019/6

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85083572479&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85083572479&partnerID=8YFLogxK

U2 - 10.1109/WPTC45513.2019.9055596

DO - 10.1109/WPTC45513.2019.9055596

M3 - Conference contribution

AN - SCOPUS:85083572479

T3 - 2019 IEEE Wireless Power Transfer Conference, WPTC 2019

SP - 63

EP - 66

BT - 2019 IEEE Wireless Power Transfer Conference, WPTC 2019

PB - Institute of Electrical and Electronics Engineers Inc.

T2 - 2019 IEEE Wireless Power Transfer Conference, WPTC 2019

Y2 - 18 June 2019 through 21 June 2019

ER -

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

Abstract

Publication series

Conference

Bibliographical note

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this