Integrated DC fast charger in an electric vehicle
(2022) In CODEN:LUTEDX/TEIE EIEM01 20212Industrial Electrical Engineering and Automation
- Abstract
- More and more electric vehicles are emerging with a nominal battery voltage higher than what most older DC fast chargers are capable of charging. This requires the vehicle manufacturers to include a high power DC to DC converter in order to be able to charge at these stations, adding cost and complexity. Instead, with only minor modifications of the traction system, the motor and inverter can be used as three parallel DC to DC converters, removing the need for an extra converter.
The aim is to develop, assemble and test a low voltage system that can run at about the same current level as existing charging stations. Its performance is assessed and the measured efficiency is compared to a theoretically derived one. The results are then... (More) - More and more electric vehicles are emerging with a nominal battery voltage higher than what most older DC fast chargers are capable of charging. This requires the vehicle manufacturers to include a high power DC to DC converter in order to be able to charge at these stations, adding cost and complexity. Instead, with only minor modifications of the traction system, the motor and inverter can be used as three parallel DC to DC converters, removing the need for an extra converter.
The aim is to develop, assemble and test a low voltage system that can run at about the same current level as existing charging stations. Its performance is assessed and the measured efficiency is compared to a theoretically derived one. The results are then extrapolated to a higher voltage in order to investigate its feasibility.
The system is proven to work satisfactorily at the low voltage, although with quite poor efficiency of about 80% at around 5 kW charging. When increasing the voltage the efficiency seems promising although some concerns are raised about the increased current ripple. (Less) - Popular Abstract
- More and more electric vehicles are starting to use a higher battery voltage than what most older DC fast chargers along the roads are capable of charging. This has led some car manufacturers to include a bulky converter just to be able to charge at the older stations. Instead, with only minor modifications to the car, the motor and inverter (normally used to propel the car) can be used as a converter when charging, removing the need for an extra one.
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/9076678
- author
- Johansson, Christoffer LU and von Keyserlingk, Axel LU
- supervisor
- organization
- course
- EIEM01 20212
- year
- 2022
- type
- H3 - Professional qualifications (4 Years - )
- subject
- keywords
- Boost converter, DC charging, Electric machine, Inverter, Electric vehicle
- publication/series
- CODEN:LUTEDX/TEIE
- report number
- 5473
- language
- English
- id
- 9076678
- date added to LUP
- 2022-06-14 12:54:43
- date last changed
- 2022-10-01 03:41:55
@misc{9076678,
abstract = {{More and more electric vehicles are emerging with a nominal battery voltage higher than what most older DC fast chargers are capable of charging. This requires the vehicle manufacturers to include a high power DC to DC converter in order to be able to charge at these stations, adding cost and complexity. Instead, with only minor modifications of the traction system, the motor and inverter can be used as three parallel DC to DC converters, removing the need for an extra converter.
The aim is to develop, assemble and test a low voltage system that can run at about the same current level as existing charging stations. Its performance is assessed and the measured efficiency is compared to a theoretically derived one. The results are then extrapolated to a higher voltage in order to investigate its feasibility.
The system is proven to work satisfactorily at the low voltage, although with quite poor efficiency of about 80% at around 5 kW charging. When increasing the voltage the efficiency seems promising although some concerns are raised about the increased current ripple.}},
author = {{Johansson, Christoffer and von Keyserlingk, Axel}},
language = {{eng}},
note = {{Student Paper}},
series = {{CODEN:LUTEDX/TEIE}},
title = {{Integrated DC fast charger in an electric vehicle}},
year = {{2022}},
}