Integrated Grid Inductor-Transformer Structure with Reduced Core Loss and Volume for E-Capless Single-Stage EV Charger
Abstract
This paper presents the design and optimization of an integrated magnetic structure that combines the grid inductors and transformer in the single-stage EV -charger. The proposed integration technique reduces the number of magnetic bodies, hence reducing the cost and total magnetic core loss while increasing the power density. By utilizing the fixed 50% duty cycle operation of the converter, a further reduction in core loss can be achieved resulting in improved light-load efficiency. This paper also presents an analysis of the optimal PCB winding arrangements for the proposed structure to achieve low winding AC loss and stray capacitance. To validate the proposed integrated magnetic structure, a 3.7 kW single-stage AC-DC converter prototype with four different cases of magnetic structures is built. Experimental comparison of these four cases shows that the proposed integrated magnetic structure has higher efficiency and power density compared to the non-integrated ones. U sing the proposed integrated magnetic structure, the core loss that dominates at light-load is improved resulting in an increase of efficiency by 0.9%. At the same time, the proposed integration technique reduces the number of magnetic cores as well as total core volume, reducing the cost and improving the converter power density by up to 11.1 %.
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Seoul Tech in [117] present a single-stage OBC converter which is extremely compact and uses an interleaved dual active bridge (DAB) type of configuration, with a power density of 7.3 kW/L and an efficiency of 97.1%.
“Seoul Tech in [117] present a single-stage OBC converter which is extremely compact and uses an interleaved dual active bridge (DAB) type of configuration.The presented topology has a power density of 7.3 kW/L and a reduced efficiency value of 97.1%.”
From On-Board Chargers for Electric Vehicles: A Comprehensive Performance and Efficiency Review (2024) · cites this paper as [117]
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On-Board Chargers for Electric Vehicles: A Comprehensive Performance and Efficiency Review
Dar, A. R., Haque, A., Khan, M. A., Kurukuru, V. S. B., & Mehfuz, S. (2024) · Energies · doi:10.3390/en17184534 · Cited by 45 · see citing works
“Seoul Tech in [117] present a single-stage OBC converter which is extremely compact and uses an interleaved dual active bridge (DAB) type of configuration.”
- Authors
- Muhammad, R., Kieu, H.-P., Park, J., Tat-Thang, L., Choi, S., Jung, H., & Yoon, B.-K.
- Affiliations
- Seoul National University of Science and Technology Seoul,Korea
- Seoul National University of Science and Technology (KR)
- Hyundai Motors (South Korea) (KR)
- Venue
- 2022 IEEE Applied Power Electronics Conference and Exposition (APEC)
- Publisher
- IEEE
- Published
- 2022-03-20
- Pages
- 873-878
- ISSN
- 1048-2334 (ISSN-L)
- OpenAlex
- W4280533257
- Cited by
- 15
- References
- 15
- Citations by year
- 2026: 3 · 2025: 5 · 2024: 4 · 2023: 1 · 2022: 2
- FWCI
- 4.85
- Type
- conference paper
- Language
- en
- Open access
- closed
- Locations
- Conference proceedings/Conference proceedings - IEEE Applied Power Electronics Conference and Exposition (publishedVersion)
- Topics
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Advanced DC-DC Converters
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Wireless Power Transfer Systems
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Multilevel Inverters and Converters
- Keywords
- transformer models, core loss reduction, power density, light load efficiency, parasitic capacitance, AC-DC converter, electric vehicle charging
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