Capacitor Design for Self-Resonant Coils for Long-Distance Wireless Power Transfer System

Mostak Mohammad; Vandana Rallabandi; Omer C. Onar; Gui-Jia Su

doi:10.1109/APEC48143.2025.10977376

Capacitor Design for Self-Resonant Coils for Long-Distance Wireless Power Transfer System

Mostak Mohammad, Vandana Rallabandi, Omer C. Onar, Gui-Jia Su

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

Abstract

In this paper, an integrated capacitor design is proposed for higher-order resonant tank topologies for self-resonant coils, such as series, parallel, LCC, LLC, etc. The capacitor is one of the large, lossy, and thermally vulnerable components of a high-frequency resonant tank, and designing a high-voltage, thermally stable resonant capacitor can be highly challenging. Designing the extremely high-voltage capacitor as an integral part of the coil reduces the size and complexity of the coil assembly. This paper proposes a low-loss PCB-based high-voltage capacitor design to achieve that target, which can be implemented as an integral part of the coil. The proposed capacitor designs are simulated using Multiphysics FEA and tested experimentally. A 23 kV, 133 pF capacitor prototype was built and tested as part of a 1 kW long-distance wireless charging system. The test results verify the capacitor's voltage, current, and thermal resiliency performance.

Original language	English
Title of host publication	APEC 2025 - 14th Annual IEEE Applied Power Electronics Conference and Exposition
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	1635-1639
Number of pages	5
ISBN (Electronic)	9798331516116
DOIs	https://doi.org/10.1109/APEC48143.2025.10977376
State	Published - 2025
Event	14th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2025 - Atlanta, United States Duration: Mar 16 2025 → Mar 20 2025

Publication series

Name	Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
ISSN (Print)	1048-2334
ISSN (Electronic)	2470-6647

Conference

Conference	14th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2025
Country/Territory	United States
City	Atlanta
Period	03/16/25 → 03/20/25

Funding

This manuscript has been authored by Oak Ridge National Laboratory, operated by UT-Battelle, LLC, under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).

Keywords

electric vehicle
EMF
Inductive charging
leakage field
shielding effectiveness

Access to Document

10.1109/APEC48143.2025.10977376

Cite this

Mohammad, M., Rallabandi, V., Onar, O. C., & Su, G.-J. (2025). Capacitor Design for Self-Resonant Coils for Long-Distance Wireless Power Transfer System. In APEC 2025 - 14th Annual IEEE Applied Power Electronics Conference and Exposition (pp. 1635-1639). (Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/APEC48143.2025.10977376

Mohammad, Mostak ; Rallabandi, Vandana ; Onar, Omer C. et al. / Capacitor Design for Self-Resonant Coils for Long-Distance Wireless Power Transfer System. APEC 2025 - 14th Annual IEEE Applied Power Electronics Conference and Exposition. Institute of Electrical and Electronics Engineers Inc., 2025. pp. 1635-1639 (Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC).

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title = "Capacitor Design for Self-Resonant Coils for Long-Distance Wireless Power Transfer System",

abstract = "In this paper, an integrated capacitor design is proposed for higher-order resonant tank topologies for self-resonant coils, such as series, parallel, LCC, LLC, etc. The capacitor is one of the large, lossy, and thermally vulnerable components of a high-frequency resonant tank, and designing a high-voltage, thermally stable resonant capacitor can be highly challenging. Designing the extremely high-voltage capacitor as an integral part of the coil reduces the size and complexity of the coil assembly. This paper proposes a low-loss PCB-based high-voltage capacitor design to achieve that target, which can be implemented as an integral part of the coil. The proposed capacitor designs are simulated using Multiphysics FEA and tested experimentally. A 23 kV, 133 pF capacitor prototype was built and tested as part of a 1 kW long-distance wireless charging system. The test results verify the capacitor's voltage, current, and thermal resiliency performance.",

keywords = "electric vehicle, EMF, Inductive charging, leakage field, shielding effectiveness",

author = "Mostak Mohammad and Vandana Rallabandi and Onar, {Omer C.} and Gui-Jia Su",

note = "Publisher Copyright: {\textcopyright} 2025 IEEE.; 14th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2025 ; Conference date: 16-03-2025 Through 20-03-2025",

year = "2025",

doi = "10.1109/APEC48143.2025.10977376",

language = "English",

series = "Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC",

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Mohammad, M , Rallabandi, V , Onar, OC & Su, G-J 2025, Capacitor Design for Self-Resonant Coils for Long-Distance Wireless Power Transfer System. in APEC 2025 - 14th Annual IEEE Applied Power Electronics Conference and Exposition. Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC, Institute of Electrical and Electronics Engineers Inc., pp. 1635-1639, 14th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2025, Atlanta, United States, 03/16/25. https://doi.org/10.1109/APEC48143.2025.10977376

Capacitor Design for Self-Resonant Coils for Long-Distance Wireless Power Transfer System. / Mohammad, Mostak ; Rallabandi, Vandana ; Onar, Omer C. et al.
APEC 2025 - 14th Annual IEEE Applied Power Electronics Conference and Exposition. Institute of Electrical and Electronics Engineers Inc., 2025. p. 1635-1639 (Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC).

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

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AU - Rallabandi, Vandana

AU - Onar, Omer C.

AU - Su, Gui-Jia

PY - 2025

Y1 - 2025

N2 - In this paper, an integrated capacitor design is proposed for higher-order resonant tank topologies for self-resonant coils, such as series, parallel, LCC, LLC, etc. The capacitor is one of the large, lossy, and thermally vulnerable components of a high-frequency resonant tank, and designing a high-voltage, thermally stable resonant capacitor can be highly challenging. Designing the extremely high-voltage capacitor as an integral part of the coil reduces the size and complexity of the coil assembly. This paper proposes a low-loss PCB-based high-voltage capacitor design to achieve that target, which can be implemented as an integral part of the coil. The proposed capacitor designs are simulated using Multiphysics FEA and tested experimentally. A 23 kV, 133 pF capacitor prototype was built and tested as part of a 1 kW long-distance wireless charging system. The test results verify the capacitor's voltage, current, and thermal resiliency performance.

AB - In this paper, an integrated capacitor design is proposed for higher-order resonant tank topologies for self-resonant coils, such as series, parallel, LCC, LLC, etc. The capacitor is one of the large, lossy, and thermally vulnerable components of a high-frequency resonant tank, and designing a high-voltage, thermally stable resonant capacitor can be highly challenging. Designing the extremely high-voltage capacitor as an integral part of the coil reduces the size and complexity of the coil assembly. This paper proposes a low-loss PCB-based high-voltage capacitor design to achieve that target, which can be implemented as an integral part of the coil. The proposed capacitor designs are simulated using Multiphysics FEA and tested experimentally. A 23 kV, 133 pF capacitor prototype was built and tested as part of a 1 kW long-distance wireless charging system. The test results verify the capacitor's voltage, current, and thermal resiliency performance.

KW - electric vehicle

KW - EMF

KW - Inductive charging

KW - leakage field

KW - shielding effectiveness

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M3 - Conference contribution

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ER -

Mohammad M , Rallabandi V , Onar OC , Su GJ. Capacitor Design for Self-Resonant Coils for Long-Distance Wireless Power Transfer System. In APEC 2025 - 14th Annual IEEE Applied Power Electronics Conference and Exposition. Institute of Electrical and Electronics Engineers Inc. 2025. p. 1635-1639. (Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC). doi: 10.1109/APEC48143.2025.10977376

Capacitor Design for Self-Resonant Coils for Long-Distance Wireless Power Transfer System

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