Abstract
In conventional arrangements of three-phase LLC converters, there are at least three magnetic components that occupy a considerable volume and mass of the power converter. Although, the three-phase LLC topology has many advantages over the single-phase one, circuit designers tend to select the singlephase topology because it has a minimal number of magnetic components. In this paper, with the purpose of promoting the industrial applications of the three-phase topology, Lagrangian dynamics is applied to theoretically prove that it is possible to replace the three-discrete transformers by a single integrated transformer. The Lagrangian dynamics theory allowed us to derive a physically motivated model for the integrated transformer, in which each component of the integrated transformer has its own Lagrangian parameter. The remarkable result to emerge from the Lagrangian model is that in a symmetrical design, there is no interphase coupling; this is regardless of the value of the coupling coefficient between the phases. This means that there is no return path for the three ac fluxes, and as a result the magnetic components can be downsized. Therefore, the major advantages of using integrated magnetics in the LLC converter can be concluded as: cost-reduction, reduced weight, and realizing higher power density. Along with the theoretical discussion, experimental validation is provided utilizing a 500W - 390V/12V - 200kHz prototype.
| Original language | English |
|---|---|
| Title of host publication | 2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017 |
| Publisher | Institute of Electrical and Electronics Engineers Inc. |
| Pages | 3781-3787 |
| Number of pages | 7 |
| Volume | 2017-January |
| ISBN (Electronic) | 9781509029983 |
| DOIs | |
| Publication status | Published - Nov 3 2017 |
| Event | 9th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2017 - Cincinnati, United States Duration: Oct 1 2017 → Oct 5 2017 |
Other
| Other | 9th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2017 |
|---|---|
| Country | United States |
| City | Cincinnati |
| Period | 10/1/17 → 10/5/17 |
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Keywords
- Integrated magnetics
- Lagrangian dynamics
- Multi-phase converters
- Resonant converters
- Three-phase LLC resonant converter
ASJC Scopus subject areas
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering
- Renewable Energy, Sustainability and the Environment
- Control and Optimization
Cite this
A Lagrangian dynamics model of integrated transformer incorporated in a multi-phase LLC resonant converter. / Noah, Mostafa; Umetani, Kazuhiro; Endo, Shun; Ishibashi, Hiraki; Imaoka, Jun; Yamamoto, Masayoshi.
2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017. Vol. 2017-January Institute of Electrical and Electronics Engineers Inc., 2017. p. 3781-3787 8096668.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - A Lagrangian dynamics model of integrated transformer incorporated in a multi-phase LLC resonant converter
AU - Noah, Mostafa
AU - Umetani, Kazuhiro
AU - Endo, Shun
AU - Ishibashi, Hiraki
AU - Imaoka, Jun
AU - Yamamoto, Masayoshi
PY - 2017/11/3
Y1 - 2017/11/3
N2 - In conventional arrangements of three-phase LLC converters, there are at least three magnetic components that occupy a considerable volume and mass of the power converter. Although, the three-phase LLC topology has many advantages over the single-phase one, circuit designers tend to select the singlephase topology because it has a minimal number of magnetic components. In this paper, with the purpose of promoting the industrial applications of the three-phase topology, Lagrangian dynamics is applied to theoretically prove that it is possible to replace the three-discrete transformers by a single integrated transformer. The Lagrangian dynamics theory allowed us to derive a physically motivated model for the integrated transformer, in which each component of the integrated transformer has its own Lagrangian parameter. The remarkable result to emerge from the Lagrangian model is that in a symmetrical design, there is no interphase coupling; this is regardless of the value of the coupling coefficient between the phases. This means that there is no return path for the three ac fluxes, and as a result the magnetic components can be downsized. Therefore, the major advantages of using integrated magnetics in the LLC converter can be concluded as: cost-reduction, reduced weight, and realizing higher power density. Along with the theoretical discussion, experimental validation is provided utilizing a 500W - 390V/12V - 200kHz prototype.
AB - In conventional arrangements of three-phase LLC converters, there are at least three magnetic components that occupy a considerable volume and mass of the power converter. Although, the three-phase LLC topology has many advantages over the single-phase one, circuit designers tend to select the singlephase topology because it has a minimal number of magnetic components. In this paper, with the purpose of promoting the industrial applications of the three-phase topology, Lagrangian dynamics is applied to theoretically prove that it is possible to replace the three-discrete transformers by a single integrated transformer. The Lagrangian dynamics theory allowed us to derive a physically motivated model for the integrated transformer, in which each component of the integrated transformer has its own Lagrangian parameter. The remarkable result to emerge from the Lagrangian model is that in a symmetrical design, there is no interphase coupling; this is regardless of the value of the coupling coefficient between the phases. This means that there is no return path for the three ac fluxes, and as a result the magnetic components can be downsized. Therefore, the major advantages of using integrated magnetics in the LLC converter can be concluded as: cost-reduction, reduced weight, and realizing higher power density. Along with the theoretical discussion, experimental validation is provided utilizing a 500W - 390V/12V - 200kHz prototype.
KW - Integrated magnetics
KW - Lagrangian dynamics
KW - Multi-phase converters
KW - Resonant converters
KW - Three-phase LLC resonant converter
UR - http://www.scopus.com/inward/record.url?scp=85041486356&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85041486356&partnerID=8YFLogxK
U2 - 10.1109/ECCE.2017.8096668
DO - 10.1109/ECCE.2017.8096668
M3 - Conference contribution
AN - SCOPUS:85041486356
VL - 2017-January
SP - 3781
EP - 3787
BT - 2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017
PB - Institute of Electrical and Electronics Engineers Inc.
ER -