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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 buck-boost transformerless DC-DC converter based on IGBT modules for fast charge of electric vehicles
A transformer-less Buck-Boost DC-DC converter in usage for the fast-charge of electric vehicles, based on powerful high-voltage IGBT (Isolated Gate Bipolar Transistor) 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 to support nowadays vehicles on-board battery packs; efficiency and power density accepted to be high enough for such 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 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
2079-9292
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), 1-25, [397]. (doi:10.3390/electronics9030397).

Record type: Article

Abstract

A transformer-less Buck-Boost DC-DC converter in usage for the fast-charge of electric vehicles, based on powerful high-voltage IGBT (Isolated Gate Bipolar Transistor) 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 to support nowadays vehicles on-board battery packs; efficiency and power density accepted to be high enough for such 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 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
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More information

Accepted/In Press date: 25 February 2020
e-pub ahead of print date: 28 February 2020
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
ORCID for Andrew Cruden: ORCID iD orcid.org/0000-0003-3236-2535

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Date deposited: 11 Mar 2020 17:31
Last modified: 26 Nov 2021 02:59

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Contributors

Author: Borislav Dimitrov
Author: Suleiman Sharkh
Author: Andrew Cruden ORCID iD
Author: Khaled Hayatleh
Author: Steve Barker
Author: Gordana Collier

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