A design and control of bi-directional non-isolated DC-DC converter for rapid electric vehicle charging system
Abstract
This paper presents a simple and cost-effective stand-alone rapid battery charging system of 30kW for electric vehicles. The proposed system mainly consists of active front-end rectifier of neutral point clamped 3-level type and non-isolated bi-directional dc-dc converter of multiphase interleaved half-bridge topology. The charging system is designed to operate for both lithium-polymer and lithium-ion batteries. The complete charging sequence is made up of three sub-interval operating modes; pre-charge mode, constant-current mode, and constant-voltage mode. The pre-charge mode employs the stair-case shaped current profile to accomplish shorter charging time while maintaining the reliable operation of the battery. The proposed system is able to reach the full-charge state within less than 16min for the battery capacity of 8kWh by supplying the charging current of 78A. The optimal discharging algorithm for Vehicle to the Grid (V2G) operation has been adopted to maintain the discharging current of 1C. Owing to the simple and compact power conversion scheme, the proposed solution has superior module-friendly mechanical structure which is absolutely required to realize flexible power expansion capability in a very high-current rapid charging system.
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Interleaving technology significantly reduces current ripple at switching frequency through multiphase operation, enabling the use of smaller EMI filters.
“The bidirectional converter shown in Figure 4a employs interleaving technology, which significantly reduces current ripple at switching frequency through multiphase operation, thereby enabling the use of smaller EMI filters [50].”
From Bidirectional DC-DC Converter Topologies for Hybrid Energy Storage Systems in Electric Vehicles: A Comprehensive Review (2025) · cites this paper as [50]
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- Authors
- Kang, T., Kim, C., Suh, Y., Park, H., Kang, B., & Kim, D.
- Affiliations
- Jeonbuk National University (KR)
- ILJIN Group (South Korea) (KR)
- Venue
- 2012 Twenty-Seventh Annual IEEE Applied Power Electronics Conference and Exposition (APEC)
- Publisher
- IEEE
- Published
- 2012-02
- Pages
- 14-21
- ISSN
- 1048-2334 (ISSN-L)
- OpenAlex
- W2101385018
- Cited by
- 68
- References
- 15
- Citations by year
- 2026: 3 · 2025: 5 · 2024: 9 · 2023: 10 · 2022: 10 · 2021: 7 · 2020: 5 · 2019: 2 · 2018: 5 · 2017: 3 · 2016: 4 · 2015: 2 · 2014: 2 · 2013: 1
- FWCI
- 2.04
- 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
- active front-end rectifier, lithium-ion battery charging, constant current constant voltage charging, vehicle-to-grid discharging
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