Extended Modulation Strategy for Wide Input Range Flying Capacitor based High Step-down LLC Resonant Converter

Palanisamy, A; Hassan, J; Lu, D; Aguilera, RP; Siwakoti, YP

Extended Modulation Strategy for Wide Input Range Flying Capacitor based High Step-down LLC Resonant Converter

Palanisamy, A

Hassan, J Lu, D Aguilera, RP Siwakoti, YP

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Publisher:: IEEE
Publication Type:: Conference Proceeding
Citation:: 2025 IEEE ENERGY CONVERSION CONFERENCE CONGRESS AND EXPOSITION, ECCE, 2025, 00
Issue Date:: 2025

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Field	Value	Language
dc.contributor.author	Palanisamy, A https://orcid.org/0000-0003-1454-8010
dc.contributor.author	Hassan, J
dc.contributor.author	Lu, D
dc.contributor.author	Aguilera, RP
dc.contributor.author	Siwakoti, YP
dc.date	2025-10-19
dc.date.accessioned	2026-02-26T01:24:53Z
dc.date.available	2026-02-26T01:24:53Z
dc.date.issued	2025
dc.identifier.citation	2025 IEEE ENERGY CONVERSION CONFERENCE CONGRESS AND EXPOSITION, ECCE, 2025, 00
dc.identifier.isbn	979-8-3315-4131-6
dc.identifier.issn	2329-3721
dc.identifier.uri	http://hdl.handle.net/10453/193725
dc.description.abstract	LLC converters operating across wide input voltage ranges tend to deviate from their optimal efficiency point, leading to a decline in overall performance. The flying capacitor based isolated resonant converter (FCiRC) with its frequency multiplication capability, is a viable candidate for high power density converter design. It offers a high step-down conversion from 800 V input to 48 V regulated output. Nevertheless, limiting its boundaries, the existing modulation scheme does not allow for a wide-input range operation. Addressing this shortcoming, the current work proposes three additional modulation strategies allowing the converter to operate under a wide input voltage ranging from 160 V to 960 V, delivering a regulated 48 V output. The converter maintains a stable efficiency of approximately 91 % across all modulation strategies, while preserving its key benefits-such as simplified magnetic design despite wide frequency variations across modes, and lower voltage stress on the switches. Experimental validation of the proposed modulation strategy has been presented.
dc.language	en
dc.publisher	IEEE
dc.relation.ispartof	2025 IEEE ENERGY CONVERSION CONFERENCE CONGRESS AND EXPOSITION, ECCE
dc.relation.ispartof	2025 Energy Conversion Congress and Exposition-ECCE-Annual
dc.relation.ispartofseries	IEEE Energy Conversion Congress and Exposition
dc.relation.isbasedon	10.1109/ECCE58356.2025.11259525
dc.rights	info:eu-repo/semantics/openAccess
dc.title	Extended Modulation Strategy for Wide Input Range Flying Capacitor based High Step-down LLC Resonant Converter
dc.type	Conference Proceeding
utslib.citation.volume	00
utslib.location.activity	PA, Philadelphia
pubs.organisational-group	University of Technology Sydney
pubs.organisational-group	University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	University of Technology Sydney/Faculty of Engineering and Information Technology/School of Electrical and Data Engineering
pubs.organisational-group	University of Technology Sydney/Faculty of Engineering and Information Technology/Engineering and IT Related HDR Students
utslib.copyright.status	open_access	*
dc.date.updated	2026-02-26T01:24:20Z
pubs.finish-date	2025-10-23
pubs.publication-status	Published
pubs.start-date	2025-10-19
pubs.volume	00

Abstract:

LLC converters operating across wide input voltage ranges tend to deviate from their optimal efficiency point, leading to a decline in overall performance. The flying capacitor based isolated resonant converter (FCiRC) with its frequency multiplication capability, is a viable candidate for high power density converter design. It offers a high step-down conversion from 800 V input to 48 V regulated output. Nevertheless, limiting its boundaries, the existing modulation scheme does not allow for a wide-input range operation. Addressing this shortcoming, the current work proposes three additional modulation strategies allowing the converter to operate under a wide input voltage ranging from 160 V to 960 V, delivering a regulated 48 V output. The converter maintains a stable efficiency of approximately 91 % across all modulation strategies, while preserving its key benefits-such as simplified magnetic design despite wide frequency variations across modes, and lower voltage stress on the switches. Experimental validation of the proposed modulation strategy has been presented.

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http://hdl.handle.net/10453/193725