A buck-boost transformerless DC-DC converter based on IGBT modules for fast charge of electric vehicles
A buck-boost transformerless DC-DC converter based on IGBT modules for fast charge of electric vehicles
A transformer‐less Buck‐Boost direct current–direct current (DC–DC) converter in use for the fast charge of electric vehicles, based on powerful high‐voltage isolated gate bipolar transistor (IGBT) modules is analyzed, designed and experimentally verified. The main advantages of this topology are: simple structure on the converter’s power stage; a wide range of the output voltage, capable of supporting contemporary vehicles’ on‐board battery packs; efficiency; and power density accepted to be high enough for such a class of hard‐switched converters. A precise estimation of the loss, dissipated in the converter’s basic modes of operation Buck, Boost, and Buck‐Boost is presented. The analysis shows an approach of loss minimization, based on switching frequency reduction during the Buck‐Boost operation mode. Such a technique guarantees stable thermal characteristics during the entire operation, i.e., battery charge cycle. As the Buck‐Boost mode takes place when Buck and Boost modes cannot support the output voltage, operating as a combination of them, it can be considered as critically dependent on the characteristics of the semiconductors. With this, the necessary duty cycle and voltage range, determined with respect to the input‐output voltages and power losses, require an additional study to be conducted. Additionally, the tolerance of the applied switching frequencies for the most versatile silicon‐based powerful IGBT modules is analyzed and experimentally verified. Finally, several important characteristics, such as transients during switch‐on and switch‐off, IGBTs’ voltage tails, critical duty cycles, etc., are depicted experimentally with oscillograms, obtained by an experimental model.
Buck-Boost, DC-DC, converter, electric vehicles, fast battery charger
1-25
Dimitrov, Borislav
7731fbe8-bd2b-4dd1-8594-75beb831826a
Sharkh, Suleiman
c8445516-dafe-41c2-b7e8-c21e295e56b9
Cruden, Andrew
ed709997-4402-49a7-9ad5-f4f3c62d29ab
Hayatleh, Khaled
a49a9607-dcb1-4003-a95b-5c2b3986f44c
Barker, Steve
00504f81-7e2e-40d9-9a67-c0c9868f6af8
Collier, Gordana
3875ea1d-b5c6-4044-9a72-c1944f0b6eb3
Dimitrov, Borislav
7731fbe8-bd2b-4dd1-8594-75beb831826a
Sharkh, Suleiman
c8445516-dafe-41c2-b7e8-c21e295e56b9
Cruden, Andrew
ed709997-4402-49a7-9ad5-f4f3c62d29ab
Hayatleh, Khaled
a49a9607-dcb1-4003-a95b-5c2b3986f44c
Barker, Steve
00504f81-7e2e-40d9-9a67-c0c9868f6af8
Collier, Gordana
3875ea1d-b5c6-4044-9a72-c1944f0b6eb3
Dimitrov, Borislav, Sharkh, Suleiman, Cruden, Andrew, Hayatleh, Khaled, Barker, Steve and Collier, Gordana
(2020)
A buck-boost transformerless DC-DC converter based on IGBT modules for fast charge of electric vehicles.
Electronics, 9 (3), , [397].
(doi:10.3390/electronics9030397).
Abstract
A transformer‐less Buck‐Boost direct current–direct current (DC–DC) converter in use for the fast charge of electric vehicles, based on powerful high‐voltage isolated gate bipolar transistor (IGBT) modules is analyzed, designed and experimentally verified. The main advantages of this topology are: simple structure on the converter’s power stage; a wide range of the output voltage, capable of supporting contemporary vehicles’ on‐board battery packs; efficiency; and power density accepted to be high enough for such a class of hard‐switched converters. A precise estimation of the loss, dissipated in the converter’s basic modes of operation Buck, Boost, and Buck‐Boost is presented. The analysis shows an approach of loss minimization, based on switching frequency reduction during the Buck‐Boost operation mode. Such a technique guarantees stable thermal characteristics during the entire operation, i.e., battery charge cycle. As the Buck‐Boost mode takes place when Buck and Boost modes cannot support the output voltage, operating as a combination of them, it can be considered as critically dependent on the characteristics of the semiconductors. With this, the necessary duty cycle and voltage range, determined with respect to the input‐output voltages and power losses, require an additional study to be conducted. Additionally, the tolerance of the applied switching frequencies for the most versatile silicon‐based powerful IGBT modules is analyzed and experimentally verified. Finally, several important characteristics, such as transients during switch‐on and switch‐off, IGBTs’ voltage tails, critical duty cycles, etc., are depicted experimentally with oscillograms, obtained by an experimental model.
Text
A Buck-Boost Transformerless DC-DC Converter paper 25 02 20
- Accepted Manuscript
More information
Accepted/In Press date: 25 February 2020
e-pub ahead of print date: 28 February 2020
Additional Information:
Publisher Copyright:
© 2020, MDPI AG. All rights reserved.
Keywords:
Buck-Boost, DC-DC, converter, electric vehicles, fast battery charger
Identifiers
Local EPrints ID: 438490
URI: http://eprints.soton.ac.uk/id/eprint/438490
ISSN: 2079-9292
PURE UUID: 9935f92f-6710-49db-b7e1-95201aff79a7
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Date deposited: 11 Mar 2020 17:31
Last modified: 17 Mar 2024 03:29
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Contributors
Author:
Borislav Dimitrov
Author:
Khaled Hayatleh
Author:
Steve Barker
Author:
Gordana Collier
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