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Volume 14
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10.3390/electronics14020283
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Article

Two-Stage Isolated Bidirectional DC-DC Converter with Low Profile and Double Heat Sink for Battery Charging/Discharging System

by
Seong-Yong Hong
1,
Sang-Gyun Ryu
1,
Chan-Bae Park
2,
Hyung-Woo Lee
3 and
Jae-Bum Lee
4,*
1
Department of AI-Transportation Convergence, Korea National University of Transportation, 157, Cheoldobangmulgwan-ro, Uiwang-si 16106, Republic of Korea
2
Department of Railroad Operation Systems Engineering, Korea National University of Transportation, 157, Cheoldobangmulgwan-ro, Uiwang-si 16106, Republic of Korea
3
Department of Railway Vehicle System Engineering, Korea National University of Transportation, 157, Cheoldobangmulgwan-ro, Uiwang-si 16106, Republic of Korea
4
Department of Railroad Electrical and Information Engineering, Korea National University of Transportation, 157, Cheoldobangmulgwan-ro, Uiwang-si 16106, Republic of Korea
*
Author to whom correspondence should be addressed.
Electronics 2025, 14(2), 283; https://doi.org/10.3390/electronics14020283
Submission received: 4 December 2024 / Revised: 4 January 2025 / Accepted: 10 January 2025 / Published: 12 January 2025
(This article belongs to the Special Issue Advanced DC-DC Converter Topology Design, Control, Application)
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Abstract

This paper proposes an isolated bidirectional dc-dc converter (IBDC) without a cooling fan with a low profile for a direct connection between a battery and the IBDC. To implement the low-profile IBDC, a dual active bridge (DAB) and two interleaved buck/boost converters are adopted in the proposed system. For the IBDC with a low profile and high efficiency, two transformers in the DAB converter are separated in series on their primary side and in parallel on their secondary side. In addition, in two interleaved buck/boost converters, their inputs and outputs are connected in parallel, and interleaving control is applied for a small total of inductor current ripple. Finally, a double heat sink is designed for excellent heat dissipation performance. A 500 W low-profile and fanless prototype with 650 V input and 1 (60 W)~5 V (500 W) output was made to verify its performance of operation, efficiency, and saturation temperature.
Keywords: isolated bidirectional dc-dc converter (IBDC); low-profile; double heat sink; battery charging/discharging test equipment isolated bidirectional dc-dc converter (IBDC); low-profile; double heat sink; battery charging/discharging test equipment

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MDPI and ACS Style

Hong, S.-Y.; Ryu, S.-G.; Park, C.-B.; Lee, H.-W.; Lee, J.-B. Two-Stage Isolated Bidirectional DC-DC Converter with Low Profile and Double Heat Sink for Battery Charging/Discharging System. Electronics 2025, 14, 283. https://doi.org/10.3390/electronics14020283

AMA Style

Hong S-Y, Ryu S-G, Park C-B, Lee H-W, Lee J-B. Two-Stage Isolated Bidirectional DC-DC Converter with Low Profile and Double Heat Sink for Battery Charging/Discharging System. Electronics. 2025; 14(2):283. https://doi.org/10.3390/electronics14020283

Chicago/Turabian Style

Hong, Seong-Yong, Sang-Gyun Ryu, Chan-Bae Park, Hyung-Woo Lee, and Jae-Bum Lee. 2025. "Two-Stage Isolated Bidirectional DC-DC Converter with Low Profile and Double Heat Sink for Battery Charging/Discharging System" Electronics 14, no. 2: 283. https://doi.org/10.3390/electronics14020283

APA Style

Hong, S.-Y., Ryu, S.-G., Park, C.-B., Lee, H.-W., & Lee, J.-B. (2025). Two-Stage Isolated Bidirectional DC-DC Converter with Low Profile and Double Heat Sink for Battery Charging/Discharging System. Electronics, 14(2), 283. https://doi.org/10.3390/electronics14020283

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