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

Yann E. Bouvier, Diego Serrano, Uroš Borović, Gonzalo Moreno, Miroslav Vasić, Jesús A. Oliver, Pedro Alou, José A. Cobos and Jorge Carmena
Additional contact information
Yann E. Bouvier: Centro de Electrónica Industrial, Universidad Politécnica de Madrid, Madrid 28006, Spain
Diego Serrano: Centro de Electrónica Industrial, Universidad Politécnica de Madrid, Madrid 28006, Spain
Uroš Borović: Centro de Electrónica Industrial, Universidad Politécnica de Madrid, Madrid 28006, Spain
Gonzalo Moreno: Indra Sistemas, S.A., Indra Sistemas, Calle de Joaquín Rodrigo, 11, 28300 Aranjuez, Madrid, Spain
Miroslav Vasić: Centro de Electrónica Industrial, Universidad Politécnica de Madrid, Madrid 28006, Spain
Jesús A. Oliver: Centro de Electrónica Industrial, Universidad Politécnica de Madrid, Madrid 28006, Spain
Pedro Alou: Centro de Electrónica Industrial, Universidad Politécnica de Madrid, Madrid 28006, Spain
José A. Cobos: Centro de Electrónica Industrial, Universidad Politécnica de Madrid, Madrid 28006, Spain
Jorge Carmena: Indra Sistemas, S.A., Indra Sistemas, Calle de Joaquín Rodrigo, 11, 28300 Aranjuez, Madrid, Spain

Energies, 2019, vol. 12, issue 10, 1-20

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.

Keywords: aircraft power conversion; LLC resonant converters; high efficiency; ZVS auxiliary circuit (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

Downloads: (external link)
https://www.mdpi.com/1996-1073/12/10/1850/pdf (application/pdf)
https://www.mdpi.com/1996-1073/12/10/1850/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:12:y:2019:i:10:p:1850-:d:231440

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().