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High efficiency and high gain non-isolated bidirectional dc-dc converter with soft switching capability

The non-isolated dc-dc power converters are considered as a unique option for flexible voltage control and adaptation in the modern energy conversion systems due to their simple and light configurations. To this date, these converters are primarily investigated to generate high efficiency and high g...

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Main Author: Ashique, Ratil Hasnat
Format: Thesis
Language:English
Published: 2018
Subjects:
TK Electrical engineering. Electronics Nuclear engineering
Online Access:http://eprints.utm.my/id/eprint/79490/1/RatilHasnatAshiquePFKE2018.pdf
http://eprints.utm.my/id/eprint/79490/
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spelling my.utm.794902018-10-31T12:41:46Z http://eprints.utm.my/id/eprint/79490/ High efficiency and high gain non-isolated bidirectional dc-dc converter with soft switching capability Ashique, Ratil Hasnat TK Electrical engineering. Electronics Nuclear engineering The non-isolated dc-dc power converters are considered as a unique option for flexible voltage control and adaptation in the modern energy conversion systems due to their simple and light configurations. To this date, these converters are primarily investigated to generate high efficiency and high gain with a sustained soft switching capability and a smaller footprint. On that account, this work proposes two effective solutions to address the aforementioned issues. First, a high-efficiency soft switching non-isolated bidirectional dc-dc converter with a simple configuration is proposed. The converter executes the zero voltage zero current switching (ZVZCS) over a wide operating region to ensure high efficiency. For verification, a 150 W experimental prototype is built and tested for soft switching performance by varying the input voltage, switching frequency and the loading. It is observed that the efficiency remains consistently high and has a full-load maximum of 98.2% in the boost mode and 97.5% in the buck mode. The analysis of the Electromagnetic Interference (EMI) performance of the converter also shows the improvement in the noise signature. Second, an improved high gain zero voltage switching (ZVS) nonisolated bidirectional dc-dc converter is proposed. The high gain is realized by using an intermediate energy storage cell with reduced size. Besides, the ZVS is implemented by two integrated auxiliary resonant networks. These networks ensure sustained ZVS operation over the entire duty ratio. A 200 W prototype is built to verify the concept. As a result, a full load efficiency of 97.5% (in boost mode) and 95.5% (in buck mode) is recorded at fs= 30 kHz. Also, these efficiencies are recorded as 97% (boost mode) and 94.5% (buck mode) at fs= 100 kHz. Moreover, it is observed that the efficiency (and so the soft switching) is consistent over the entire gain profile. However, there is a slight additional drop of 1.5% (boost mode) and 1% (buck mode) at extreme duty ratios. Both converters also implement soft switching for auxiliary switches and eliminate the reverse recovery loss. 2018 Thesis NonPeerReviewed application/pdf en http://eprints.utm.my/id/eprint/79490/1/RatilHasnatAshiquePFKE2018.pdf Ashique, Ratil Hasnat (2018) High efficiency and high gain non-isolated bidirectional dc-dc converter with soft switching capability. PhD thesis, Universiti Teknologi Malaysia, Faculty of Electrical Engineering.
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
language English
topic TK Electrical engineering. Electronics Nuclear engineering
spellingShingle TK Electrical engineering. Electronics Nuclear engineering
Ashique, Ratil Hasnat
High efficiency and high gain non-isolated bidirectional dc-dc converter with soft switching capability
description The non-isolated dc-dc power converters are considered as a unique option for flexible voltage control and adaptation in the modern energy conversion systems due to their simple and light configurations. To this date, these converters are primarily investigated to generate high efficiency and high gain with a sustained soft switching capability and a smaller footprint. On that account, this work proposes two effective solutions to address the aforementioned issues. First, a high-efficiency soft switching non-isolated bidirectional dc-dc converter with a simple configuration is proposed. The converter executes the zero voltage zero current switching (ZVZCS) over a wide operating region to ensure high efficiency. For verification, a 150 W experimental prototype is built and tested for soft switching performance by varying the input voltage, switching frequency and the loading. It is observed that the efficiency remains consistently high and has a full-load maximum of 98.2% in the boost mode and 97.5% in the buck mode. The analysis of the Electromagnetic Interference (EMI) performance of the converter also shows the improvement in the noise signature. Second, an improved high gain zero voltage switching (ZVS) nonisolated bidirectional dc-dc converter is proposed. The high gain is realized by using an intermediate energy storage cell with reduced size. Besides, the ZVS is implemented by two integrated auxiliary resonant networks. These networks ensure sustained ZVS operation over the entire duty ratio. A 200 W prototype is built to verify the concept. As a result, a full load efficiency of 97.5% (in boost mode) and 95.5% (in buck mode) is recorded at fs= 30 kHz. Also, these efficiencies are recorded as 97% (boost mode) and 94.5% (buck mode) at fs= 100 kHz. Moreover, it is observed that the efficiency (and so the soft switching) is consistent over the entire gain profile. However, there is a slight additional drop of 1.5% (boost mode) and 1% (buck mode) at extreme duty ratios. Both converters also implement soft switching for auxiliary switches and eliminate the reverse recovery loss.
format Thesis
author Ashique, Ratil Hasnat
author_facet Ashique, Ratil Hasnat
author_sort Ashique, Ratil Hasnat
title High efficiency and high gain non-isolated bidirectional dc-dc converter with soft switching capability
title_short High efficiency and high gain non-isolated bidirectional dc-dc converter with soft switching capability
title_full High efficiency and high gain non-isolated bidirectional dc-dc converter with soft switching capability
title_fullStr High efficiency and high gain non-isolated bidirectional dc-dc converter with soft switching capability
title_full_unstemmed High efficiency and high gain non-isolated bidirectional dc-dc converter with soft switching capability
title_sort high efficiency and high gain non-isolated bidirectional dc-dc converter with soft switching capability
publishDate 2018
url http://eprints.utm.my/id/eprint/79490/1/RatilHasnatAshiquePFKE2018.pdf
http://eprints.utm.my/id/eprint/79490/
_version_ 1643658209626423296
score 13.211869

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