Design Method of 6-Element Boundary Gain for LLC Resonant Converter of Electric Vehicle
Open accessAbstract
In the application of on-board chargers, LLC resonant converters need to work in multiple operating modes to achieve wide-range output requirements. For the most commonly used single-phase and three-phase LLC topologies, the time domain expressions of all possible operating modes are introduced to predict voltage and current behaviors. Based on the mode analysis, the 6-element boundary gain design method is proposed to design a wide gain range LLC resonant converter. The resonant current is used as the basis for ZVS judgment and the transformation trend of ZVS in the full operating range is given. Through reasonable distribution of the boost region and the buck region, the resonant devices can be designed more appropriately to achieve lower conduction loss and higher efficiency. Finally, the prototypes of 3.3kW and 6.6 kW are built to verify the theoretical analysis of the method in single-phase LLC and three-phase LLC.
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A half-bridge LLC converter can achieve a 10kW bidirectional power flow with 96% efficiency when controlled with a variable switching frequency.
“A half-bridge LLC converter, as shown in Fig.5 (a), can achieve a 10kW bidirectional power ow with 96% ef ciency when it is controlled with a variable switching frequency [105] [107].”
From A Review of Bidirectional On-Board Chargers for Electric Vehicles (2021) · cites this paper as [107]
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A Review of Bidirectional On-Board Chargers for Electric Vehicles
Yuan, J., Dorn-Gomba, L., Callegaro, A. D., Reimers, J., & Emadi, A. (2021) · IEEE Access · doi:10.1109/access.2021.3069448 · Cited by 390 · see citing works
“5 (a), can achieve a 10kW bidirectional power flow with 96% efficiency when it is controlled with a variable switching frequency [105]–[107].”
Background
- Authors
- Shen, C., Zhong, H., Zhang, Y., Tang, Y., & Zhang, Y.
- Affiliations
- Hunan University of Technology (CN)
- China Three Gorges University (CN)
- Venue
- IEEE Access
- Published
- 2020
- Volume
- 8
- Pages
- 183090-183100
- ISSN
- 2169-3536 (ISSN-L)
- OpenAlex
- W3091832956
- Cited by
- 9
- References
- 22
- Citations by year
- 2026: 1 · 2024: 1 · 2023: 4 · 2022: 1 · 2021: 2
- FWCI
- 0.60
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- IEEE Access (publishedVersion, cc-by)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- National Natural Science Foundation of China (51907061)
- Natural Science Foundation of Hunan Province of China (2019JJ50119)
- Hubei Key Laboratory of Cascaded Hydropower Stations Operation and Control (2018KJX01)
- 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 › Mechanical Engineering › Induction Heating and Inverter Technology
- Keywords
- LLC resonant converter, electric vehicle on-board charger, operating mode analysis, zero-voltage switching, resonant current, conduction losses, converter efficiency
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