ZVS Auxiliary Circuit for a 10 kW Unregulated LLC Full-Bridge Operating at Resonant Frequency for Aircraft Application

Bouvier, Yann and Serrano López, Diego and Borovic, Uroš and Moreno, Gonzalo and Vasic, Miroslav and Oliver Ramírez, Jesús Angel and Alou Cervera, Pedro and Cobos Marquez, Jose Antonio and Carmena, Jorge (2019). ZVS Auxiliary Circuit for a 10 kW Unregulated LLC Full-Bridge Operating at Resonant Frequency for Aircraft Application. "Energies", v. 12 (n. 10); pp. 1-20. ISSN 1996-1073. https://doi.org/10.3390/en12101850.

Description

Title: ZVS Auxiliary Circuit for a 10 kW Unregulated LLC Full-Bridge Operating at Resonant Frequency for Aircraft Application
Author/s:
  • Bouvier, Yann
  • Serrano López, Diego
  • Borovic, Uroš
  • Moreno, Gonzalo
  • Vasic, Miroslav
  • Oliver Ramírez, Jesús Angel
  • Alou Cervera, Pedro
  • Cobos Marquez, Jose Antonio
  • Carmena, Jorge
Item Type: Article
Título de Revista/Publicación: Energies
Date: 2019
ISSN: 1996-1073
Volume: 12
Subjects:
Freetext Keywords: aircraft power conversion; LLC resonant converters; high efficiency; ZVS auxiliary circuit
Faculty: Centro de Electrónica Industrial (CEI) (UPM)
Department: Otro
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

In modern aircraft designs, following the More Electrical Aircraft (MEA) philosophy, there is a growing need for new high-power converters. In this context, innovative solutions to provide high efficiency and power density are required. This paper proposes an unregulated LLC full-bridge operating at resonant frequency to obtain a constant gain at all loads. The first harmonic approximation (FHA) model is not accurate enough to estimate the voltage gain in converters with high parasitic resistance. A modified FHA model is proposed for voltage gain analysis, and time-based models are used to calculate the instantaneous current required for the ZVS transition analysis. A method using charge instead of current is proposed and used for this ZVS analysis. Using this method, an auxiliary circuit is proposed to achieve complete ZVS within the whole load range, avoiding a gapped transformer design and increasing the efficiency and power density. A 28 Vdc output voltage prototype, with 10 kW peak output power, has been developed to validate the theoretical analysis and the proposed auxiliary circuit. The maximum efficiency (96.3%) is achieved at the nominal power of 5 kW.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainDPI2017-88505-C2-1-RUnspecifiedUnspecifiedSoluciones óptimas para el procesado de la energía de las nuevas plantas solares de 1500V con conexión a la red eléctrica

More information

Item ID: 63805
DC Identifier: https://oa.upm.es/63805/
OAI Identifier: oai:oa.upm.es:63805
DOI: 10.3390/en12101850
Official URL: https://www.mdpi.com/1996-1073/12/10/1850
Deposited by: Memoria Investigacion
Deposited on: 26 Aug 2022 08:01
Last Modified: 26 Aug 2022 08:01
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