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Open AccessArticle

High-efficiency Bidirectional Buck–Boost Converter for Residential Energy Storage System

1
Department of Electrical Engineering, Pohang University of Science and Technology, Pohang, Kyungpook 37673, Korea
2
LG Electronics Co., Ltd., Energy Business Center, 168 Suchul-daero, Gumi, Kyungpook 39368, Korea
*
Author to whom correspondence should be addressed.
Energies 2019, 12(19), 3786; https://doi.org/10.3390/en12193786
Received: 9 September 2019 / Revised: 27 September 2019 / Accepted: 2 October 2019 / Published: 6 October 2019
(This article belongs to the Section Smart Grids and Microgrids)
This paper proposes a bidirectional dc–dc converter for residential micro-grid applications. The proposed converter can operate over an input voltage range that overlaps the output voltage range. This converter uses two snubber capacitors to reduce the switch turn-off losses, a dc-blocking capacitor to reduce the input/output filter size, and a 1:1 transformer to reduce core loss. The windings of the transformer are connected in parallel and in reverse-coupled configuration to suppress magnetic flux swing in the core. Zero-voltage turn-on of the switch is achieved by operating the converter in discontinuous conduction mode. The experimental converter was designed to operate at a switching frequency of 40–210 kHz, an input voltage of 48 V, an output voltage of 36–60 V, and an output power of 50–500 W. The power conversion efficiency for boost conversion to 60 V was ≥98.3% in the entire power range. The efficiency for buck conversion to 36 V was ≥98.4% in the entire power range. The output voltage ripple at full load was <3.59 Vp.p for boost conversion (60 V) and 1.35 Vp.p for buck conversion (36 V) with the reduced input/output filter. The experimental results indicate that the proposed converter is well-suited to smart-grid energy storage systems that require high efficiency, small size, and overlapping input and output voltage ranges. View Full-Text
Keywords: dc–dc power conversion; buck/boost conversion; step up/down converter; bidirectional converter; pulse frequency modulation dc–dc power conversion; buck/boost conversion; step up/down converter; bidirectional converter; pulse frequency modulation
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MDPI and ACS Style

Ham, S.-H.; Choi, Y.-G.; Lee, H.-S.; Lee, S.-W.; Lee, S.-C.; Kang, B. High-efficiency Bidirectional Buck–Boost Converter for Residential Energy Storage System. Energies 2019, 12, 3786.

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