---
res:
bibo_abstract:
- "LLC resonant converters typically employ power\r\nMOSFETs in their inverter stage.
The generally weak reverse\r\nrecovery behaviour of the intrinsic body diodes
of those\r\nMOSFETs causes significant turn-on losses when being forced\r\nto
hard commutations. Continuous operation in this way will\r\nlead to self-destruction
of the transistors. Consequently,\r\nzero-voltage switching (ZVS) is essential
in a MOSFET-based\r\ninverter stage. To ensure ZVS, the LLC converter is operated
in\r\nthe inductive region. On the contrary, IGBTs show dominant\r\nturn-off losses
and are therefore conventionally not applied in\r\nLLC converters typically requiring
high switching frequencies\r\nto achieve low output voltages. However, if the
LLC converter\r\nis intentionally designed for capacitive operation, zero-current\r\nswitching
(ZCS) is enabled and thus robust and cost-efficient\r\nIGBTs can be applied in
the inverter stage. The aim of this work\r\nis to investigate the use IGBTs in
the inverter of an LLC\r\nconverter. The theory behind the capacitive operated
LLC is\r\nderived using a switched simulation model and compared with\r\nthe fundamental
harmonic approximation (FHA). The results\r\nprove FHA to be useless for practical
converter design. Instead,\r\na stress value analysis based on switched model
simulations is\r\nproposed to the design a capacitive operated LLC utilizing ZCS.\r\nA
2 kW prototype for on-board EV applications was built to\r\nverify the theory
and design approach. The prototype confirms\r\nthe derived theory and thus the
deployment of IGBTs in the\r\ninverter stage of LLC resonant converters. Synchronous\r\nrectification
turns out to require a specific control solution, but\r\nif given the resulting
efficiency in the most critical operation\r\npoint exceeds the value of a MOSFET-based
(inductive\r\noperated) LLC-design of an identical application. Therefore,\r\nthis
concept should be further developed.@eng"
bibo_authorlist:
- foaf_Person:
foaf_givenName: Daniel
foaf_name: Urbaneck, Daniel
foaf_surname: Urbaneck
foaf_workInfoHomepage: http://www.librecat.org/personId=60223
- foaf_Person:
foaf_givenName: Philipp
foaf_name: Rehlaender, Philipp
foaf_surname: Rehlaender
foaf_workInfoHomepage: http://www.librecat.org/personId=69469
- foaf_Person:
foaf_givenName: Joachim
foaf_name: Böcker, Joachim
foaf_surname: Böcker
foaf_workInfoHomepage: http://www.librecat.org/personId=66
orcid: 0000-0002-8480-7295
- foaf_Person:
foaf_givenName: Frank
foaf_name: Schafmeister, Frank
foaf_surname: Schafmeister
foaf_workInfoHomepage: http://www.librecat.org/personId=71291
dct_date: 2021^xs_gYear
dct_language: eng
dct_title: LLC Converter in Capacitive Operation Utilizing ZCS for IGBTs – Theory,
Concept and Verification of a 2 kW DC-DC Converter for EVs@
...