Vehicle Electrification - February 21, 2013 - 22

Tech Report
differing dc bus voltages to interface with
batteries, motors, fuel cells, and super
capacitors—plus existing 12-V systems.
“What we need is the ability to provide
each system with the voltage at which it can
work most efficiently while continuing to
deliver 12-V for legacy technologies,” said
Prodrive’s Research Manager, Pete Tibbles.
“The availability of very high voltages from
hybrid vehicle traction batteries gives us the
opportunity to do this and more—if we can
solve the challenges of stepping voltages up
and down efficiently, without additional
weight and complexity.”
The solution, believes Tibbles, is a new
approach to the design of dc-dc converters,
an established technology used for
interfacing between the voltage levels. “At
present, every time a new voltage is needed,
another converter is added. That’s additional
weight, cost, and packaging volume. We
believe the solution is to have one compact,
lightweight converter that provides multiple
voltages.”
Prodrive is leading a British consortium
now well into a development program that
recently won additional U.K. government
funding to take this concept forward to be
demonstrated on a vehicle toward the end of
2013. The key innovation is a move from a
silicon-based power device, which limits
switching speeds to around 25 kHz, to one
based on silicon carbide.
He adds that silicon carbide-based
components permit switching speeds up to
150 kHz, allowing the use of substantially
smaller inductors and capacitors: “The very
high efficiency of the new technology also
reduces the need for heavy and complex

22

Prodrive’s Pete Tibbles
is very confident that
silicon-carbide-based
components could
facilitate the use of
significantly smaller
inductors and
capacitors.
cooling systems. We have been able to
reduce the size and weight by around twothirds—from around that of a flight bag to
more like a shoe box.”
As well as leading the consortium, Prodrive
is also responsible for the vehicle integration,
converter control system, and low-level
embedded software. The converter is based
on a topology developed by the University of
Manchester working in conjunction with
Raytheon U.K., which has developed the
silicon-carbide devices, and with IST Power
Products, which has developed the magnetic
components. The consortium’s software
specialist, SCISYS, has developed the highlevel vehicle interface software. The work
scope includes the development of safetycritical software and establishing a potential
supply chain to serve low-volume programs.
The first application is expected to be
hybrid powertrains, where there is an existing
need to interface multiple systems at different
voltages. Tibbles stated that as well as
reducing the complexity of installation and
maintenance, this will also reduce the cost
and weight of the complete, integrated
system as well as providing designers with
greater flexibility. “Standards for any of these
technologies are still emerging, so the ability
to offer an ‘open architecture’ for the power
circuit is a big step forward.”

SAE Vehicle Electrification evsae.com


http://www.evsae.com

Vehicle Electrification - February 21, 2013

Table of Contents for the Digital Edition of Vehicle Electrification - February 21, 2013

Vehicle Electrification - February 21, 2013
Contents
Forward
Tech Report
Classified Ad
In hybrid systems, mild beats wild
Upcoming from the editors
Vehicle Electrification - February 21, 2013 - Vehicle Electrification - February 21, 2013
Vehicle Electrification - February 21, 2013 - 1
Vehicle Electrification - February 21, 2013 - Contents
Vehicle Electrification - February 21, 2013 - Forward
Vehicle Electrification - February 21, 2013 - Tech Report
Vehicle Electrification - February 21, 2013 - 5
Vehicle Electrification - February 21, 2013 - 6
Vehicle Electrification - February 21, 2013 - 7
Vehicle Electrification - February 21, 2013 - 8
Vehicle Electrification - February 21, 2013 - 9
Vehicle Electrification - February 21, 2013 - 10
Vehicle Electrification - February 21, 2013 - 11
Vehicle Electrification - February 21, 2013 - 12
Vehicle Electrification - February 21, 2013 - 13
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Vehicle Electrification - February 21, 2013 - 15
Vehicle Electrification - February 21, 2013 - 16
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Vehicle Electrification - February 21, 2013 - 18
Vehicle Electrification - February 21, 2013 - 19
Vehicle Electrification - February 21, 2013 - 20
Vehicle Electrification - February 21, 2013 - 21
Vehicle Electrification - February 21, 2013 - 22
Vehicle Electrification - February 21, 2013 - Classified Ad
Vehicle Electrification - February 21, 2013 - In hybrid systems, mild beats wild
Vehicle Electrification - February 21, 2013 - 25
Vehicle Electrification - February 21, 2013 - 26
Vehicle Electrification - February 21, 2013 - 27
Vehicle Electrification - February 21, 2013 - 28
Vehicle Electrification - February 21, 2013 - 29
Vehicle Electrification - February 21, 2013 - Upcoming from the editors
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https://www.nxtbook.com/nxtbooks/sae/10AEMD0203
https://www.nxtbook.com/nxtbooks/sae/10AEID0202
https://www.nxtbook.com/nxtbooks/sae/10OFHD0203
https://www.nxtbook.com/nxtbooks/sae/10OFHD0128
https://www.nxtbook.com/nxtbooks/sae/10AEMD0127
https://www.nxtbook.com/nxtbooks/sae/10AEMD0120
https://www.nxtbook.com/nxtbooks/sae/10OFHD0114
https://www.nxtbook.com/nxtbooks/sae/10AEID0119
https://www.nxtbook.com/nxtbooks/sae/10AEMD0113
https://www.nxtbook.com/nxtbooks/sae/10AEID0105_v2
https://www.nxtbook.com/nxtbooks/sae/10AEID0105
https://www.nxtbook.com/nxtbooks/sae/09AEMD1223
https://www.nxtbook.com/nxtbooks/sae/09AEMD1209
https://www.nxtbook.com/nxtbooks/sae/AUTODEC09
https://www.nxtbook.com/nxtbooks/sae/09AEMD1125
https://www.nxtbook.com/nxtbooks/sae/09AEMD1111
https://www.nxtbook.com/nxtbooks/sae/AUTONOV09
https://www.nxtbook.com/nxtbooks/sae/OFHNOV09
https://www.nxtbook.com/nxtbooks/sae/09AEMD1028
https://www.nxtbook.com/nxtbooks/sae/09AEMD1014
https://www.nxtbook.com/nxtbooks/sae/OFHOCT09
https://www.nxtbook.com/nxtbooks/sae/AUTOOCT09
https://www.nxtbook.com/nxtbooks/sae/09AEMD0930
https://www.nxtbook.com/nxtbooks/sae/09AEMD0916
https://www.nxtbook.com/nxtbooks/sae/AUTOSEP09
https://www.nxtbook.com/nxtbooks/sae/09AEMD0902
https://www.nxtbook.com/nxtbooks/sae/09AEMD0819
https://www.nxtbook.com/nxtbooks/sae/OFHAUG09
https://www.nxtbook.com/nxtbooks/sae/09AEMD0805
https://www.nxtbook.com/nxtbooks/sae/AUTOAUG09
https://www.nxtbookmedia.com