LLC Resonant Converters as Isolated Power Factor Corrector Pre-Regulators—Analysis and Performance Evaluation

Author:

Sucameli Matteo1,Adragna Claudio1ORCID

Affiliation:

1. STMicroelectronics, 20864 Agrate Brianza, MB, Italy

Abstract

The power supply of many applications running off the power line is made up of an isolated dc-dc converter powered by a front-end power factor corrector (PFC) stage. The PFC stage ensures compliance with the electromagnetic compatibility regulations but does not usually provide safety isolation since it is typically implemented with a boost converter. Lately, the increase in multi-output power supplies, especially in lighting and USB Power Delivery applications, has raised the need for an isolated PFC at power levels where currently there is not an industry standard solution. This isolated PFC is intended to power one or more non-isolated post-regulators to enable a substantial simplification of the overall architecture and a cost reduction. The usage of an LLC resonant converter as an isolated PFC has been considered and demonstrated only quite recently, raising the industry’s attention due to the favorable converter’s characteristics that have led to its success as a dc-dc converter. This paper provides two significant contributions. Firstly, it provides a quantitative assessment of the difference in the results obtained by designing an LLC-based PFC converter based on the first harmonic approximation analysis or the time-domain analysis by applying them to the design of the same converter. Secondly, it demonstrates that designing an LLC-based PFC converter to work also in the above-resonance region optimizes its performance by reducing the (magnetizing) reactive current in the resonant tank and, therefore, the rms currents on both the input and the output side and the related power loss.

Publisher

MDPI AG

Subject

Energy (miscellaneous),Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment,Electrical and Electronic Engineering,Control and Optimization,Engineering (miscellaneous),Building and Construction

Reference31 articles.

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2. STMicroelectronics (2023, October 13). An Introduction to LLC Resonant Half-Bridge Converter, AN2644. Available online: https://www.st.com/resource/en/application_note/an2644-an-introduction-to-llc-resonant-halfbridge-converter-stmicroelectronics.pdf.

3. Ahmad, I., and Fernandes, B.G. (2020, January 10–16). Concept of Universal USB Charger. Proceedings of the 2020 IEEE Industry Applications Society Annual Meeting, Detroit, MI, USA.

4. Deo, R.N., Shrivastava, A., and Chatterjee, K. (2023). A Highly Efficient PFC Flyback Converter for Residential Lighting with Universal Input. IETE J. Res.

5. Design of Single-Stage Flyback PFC Converter for LED Driver;Qi;TELKOMNIKA (Telecommunication, Comput. Electron. Control.,2016

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