Design of an Isolated DC/DC Topology With High Efficiency of Over 97% for EV Fast Chargers
Abstract
This paper presents an DC/DC topology achieving high efficiency of over 97-% for electric vehicle (EV) fast chargers requiring a very wide output voltage range. The proposed topology consists of an unregulated resonant converter and a non-isolated buck converter. The unregulated resonant converter is responsible for the galvanic isolation for overall system, and the buck converter carries out the charging of the battery inside EV by constant-current or constant-voltage mode control. This structure provides a number of advantages such as easy realization of a very wide voltage range, no circulating-current, zero-voltage-switching operation on all the switches of the unregulated resonant converter running at high frequency and high voltage, and the achievement of high efficiency at every time over the entire battery charging profile. The availability of small passive components is a benefit because it enables the design of high power-density. In this paper, the feasibility of the proposed topology in EV fast charger applications has been verified by a prototype converter developed with the specification of 120-kHz or 50-kHz switching frequencies, maximum power rating of 20-kW, maximum charging current of 30-A, and battery voltage range of 50-650-Vdc.
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The authors of [105] suggest that a single-stage charger is employed when reduced cost and compact size are required; this research achieved an efficiency of >97%.
“The authors of [105] suggest that a single-stage charger is employed when reduced cost and compact size are required.This research was able to achieve an efficiency of >97%.”
From On-Board Chargers for Electric Vehicles: A Comprehensive Performance and Efficiency Review (2024) · cites this paper as [105]
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On-Board Chargers for Electric Vehicles: A Comprehensive Performance and Efficiency Review
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“The authors of [105] suggest that a single-stage charger is employed when reduced cost and compact size are required.”
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- Authors
- Lee, W.-S., Kim, J.-H., Lee, J.-Y., & Lee, I.-O.
- Affiliations
- Myongji University (KR)
- Venue
- IEEE Transactions on Vehicular Technology
- Published
- 2019-12
- Volume
- 68
- Issue
- 12
- Pages
- 11725-11737
- ISSN
- 0018-9545 (ISSN-L)
- 1939-9359
- OpenAlex
- W2981560195
- Cited by
- 111
- References
- 26
- Citations by year
- 2026: 10 · 2025: 14 · 2024: 22 · 2023: 21 · 2022: 26 · 2021: 14 · 2020: 4
- FWCI
- 3.96
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- IEEE Transactions on Vehicular Technology (publishedVersion)
- Funders
- National Research Foundation of Korea
- Korea government (2018R1D1A1B07048209)
- Korea Institute of Energy Technology Evaluation and Planning
- Ministry of Trade, Industry and Energy (20174030201790)
- 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
- DC-DC converter, electric vehicle fast charging, galvanic isolation, buck converter, wide output voltage range, zero-voltage switching, high efficiency, constant current constant voltage charging, power density, battery charging
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