A High-Efficiency High-Density Wide-Bandgap Device-Based Bidirectional On-Board Charger
Abstract
This paper proposes a novel two-stage topology for a 6.6-kW on-board charger. The first stage, employing an interleaved bridgeless totem-pole ac/dc in critical conduction mode to realize zero-voltage switching, is operated at over 300 kHz. A bidirectional CLLC resonant converter operating at 500 kHz is chosen for the second stage. A variable dc-link voltage is adopted to track the wide battery voltage range, so that the CLLC resonant converter can always operate at its most efficient point. The 1.2-kV SiC devices are adopted for the ac/dc stage and the primary side of dc/dc stage, while 650-V GaN devices are used for the secondary side of dc/dc stage. In addition, PCB winding coupled inductors and integrated transformer are implemented in ac/dc stage and dc/dc stage, respectively, for the purpose of high density and manufacture automation. The proposed structure is demonstrated to have 37-W/in3power density and above 96% efficiency over the entire battery voltage range, which far exceeds the current practice.
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In [109], a two-stage bidirectional OBC configuration was presented, consisting of an interleaved two-channel totem pole (TP) PFC in the first stage and a CLLC converter in the next stage.
“In [109], a two-stage bidirectional OBC configuration was presented by Virginia Tech., Centre for Power Electronics Systems (CPES), consisting of an interleaved two-channel totem pole (TP) PFC in the first stage and a CLLC converter in the next stage.”
From On-Board Chargers for Electric Vehicles: A Comprehensive Performance and Efficiency Review (2024) · cites this paper as [109]
The charger in [109] has a rated power of 6.6 kW, a power density of 2.3 kW/L, and a maximum efficiency of 96.2%.
“The charger in this study has a rated power of 6.6 kW.The power density of the proposed configuration is 2.3 kW/L and can perform the job at a maximum efficiency of 96.2%.”
From On-Board Chargers for Electric Vehicles: A Comprehensive Performance and Efficiency Review (2024) · cites this paper as [109]
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- Authors
- Li, B., Li, Q., Lee, F. C., Liu, Z., & Yang, Y.
- Affiliations
- Virginia Tech (US)
- Analog Devices (United States) (US)
- Venue
- IEEE Journal of Emerging and Selected Topics in Power Electronics
- Published
- 2018-09
- Volume
- 6
- Issue
- 3
- Pages
- 1627-1636
- ISSN
- 2168-6777 (ISSN-L)
- 2168-6785
- OpenAlex
- W2807791857
- Cited by
- 259
- References
- 31
- Citations by year
- 2026: 17 · 2025: 35 · 2024: 41 · 2023: 36 · 2022: 38 · 2021: 35 · 2020: 30 · 2019: 25 · 2018: 2
- FWCI
- 8.80
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- IEEE Journal of Emerging and Selected Topics in Power Electronics (publishedVersion)
- Funders
- Office of Energy Efficiency and Renewable Energy (DE-EE0006834)
- Virginia Polytechnic Institute and State University
- 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
- wide bandgap devices, SiC, GaN, CLLC resonant converter, zero-voltage switching, critical conduction mode, variable DC-link voltage, battery charging, power density, integrated transformer, high-efficiency power conversion
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