Zero-loss switching in LLC resonant converters under discontinuous conduction mode: analysis and design methodology
Fecha
2023Autor
Versión
Acceso abierto / Sarbide irekia
Tipo
Artículo / Artikulua
Versión
Versión aceptada / Onetsi den bertsioa
Identificador del proyecto
Impacto
|
10.1109/TIA.2023.3250205
Resumen
Many thriving applications where isolation is
required, such as LED drivers, traction and EV fast charging,
implement LLC resonant converters, particularly when voltage
regulation is not required or an additional conversion stage is in
charge of it. The LLC converter can be operated under discontinuous conduction mode (DCM), due to its advantages such as
unregulated and sensorless operation, ...
[++]
Many thriving applications where isolation is
required, such as LED drivers, traction and EV fast charging,
implement LLC resonant converters, particularly when voltage
regulation is not required or an additional conversion stage is in
charge of it. The LLC converter can be operated under discontinuous conduction mode (DCM), due to its advantages such as
unregulated and sensorless operation, fixed switching frequency
and voltage gain, and zero-current switching (ZCS). However,
ZCS results in EMI and switching losses in the primary converter,
particularly for≥1200-V devices. Alternatively, zero-loss switching
(ZLS) can be accomplished by means of a proper design of the
LLC converter, overcoming the drawbacks of ZCS. The focus
of this paper is to perform an exhaustive research on the LLC
converter under DCM-ZLS: discontinuous conduction mode with
lossless switching in the primary and secondary sides. As a result of
this analysis, a set of design boundaries are deduced for parameters
such as the magnetizing inductance, the leakage inductance, and the
gate resistance. A comprehensive, step-by-step design methodology
is proposed and applied to a 18-kW, 200-kHz test bench. The
designed parameters are implemented in the converter and several
experiments are conducted, including a test at rated input voltage
and rated power (600 V, 18 kW). The conduction states studied
theoretically in the analysis of the LLC converter are identified in
the experimental results, and the operation of the test bench under
DCM-ZLS is verified. [--]
Materias
Discontinuous conduction mode,
High-frequency
power transformer,
LLC converter,
Resonant power conversion,
Soft-switching,
Zero-loss switching
Editor
IEEE
Publicado en
IEEE Transactions on Industry Applications, 59(3), 3576-3592
Departamento
Universidad Pública de Navarra. Departamento de Ingeniería Eléctrica, Electrónica y de Comunicación /
Nafarroako Unibertsitate Publikoa. Ingeniaritza Elektrikoa, Elektronikoa eta Telekomunikazio Ingeniaritza Saila /
Universidad Pública de Navarra/Nafarroako Unibertsitate Publikoa. Institute of Smart Cities - ISC
Versión del editor
Entidades Financiadoras
This work was supported by the Public University of Navarra under Grant PID2019-
110956RB-I00, funded by MCIN/AEI/10.13039/501100011033/, and in part
by the under a PhD Scholarship.