IEEE Electrification Magazine - June 2014 - 43

image courtesy of freeimages.com/zeafonso

and electric motors require a dedicated, low-temperature (65 °c) Weg cooling system. thus, for most hevs,
there are two separate Weg coolant
systems-a low-temperature loop for
the etds and a high-temperature
(>100  °c) loop for the ice (figure 1).
often, a third coolant system using
automatic transmission fluid (atf) is
also used when the electric motor is
located within the transmission or
transaxle to provide additional cooling to the electric motor. the additional coolant loops inevitably add
components, parasitic power consumption, and cost to the vehicle.

The power
electronics convert
direct current power
from the battery
pack to alternating
current power for
operation of the
electric motor.

Increasing Power electronics Performance and
Keeping Them at Optimal Temperature
the power electronics convert dc power from the battery
pack to ac power for the operation of the electric motor. in

regenerative braking operation, the
power electronics convert ac to dc to
charge the battery pack and recuperate
energy. during operation, inefficiencies
in the devices generate heat that must
be dissipated. the heat flux generated
by the power electronics devices varies
with the number and area of semiconductor devices, which are dependent
on the size and type of vehicle (e.g., ev
and hev).
older-generation automotive power
electronics modules were typically
cooled via an aluminum cold plate
mounted to the modules, with thermal
grease applied at the interface [figure 2(a)]. to reduce the
package thermal resistance, modern designs eliminate the
thermal grease interface and apply cooling directly to the
module base plate [figure 2(b)]. a more advanced doublesided power electronics cooling approach is used in the
2008 lexus hybrid system (ls 600h). in this double-sided
IEEE Electrific ation Magazine / j une 2 0 1 4

43



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Table of Contents for the Digital Edition of IEEE Electrification Magazine - June 2014

IEEE Electrification Magazine - June 2014 - Cover1
IEEE Electrification Magazine - June 2014 - Cover2
IEEE Electrification Magazine - June 2014 - 1
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IEEE Electrification Magazine - June 2014 - 3
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IEEE Electrification Magazine - June 2014 - 79
IEEE Electrification Magazine - June 2014 - 80
IEEE Electrification Magazine - June 2014 - Cover3
IEEE Electrification Magazine - June 2014 - Cover4
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https://www.nxtbook.com/nxtbooks/pes/electrification_december2021
https://www.nxtbook.com/nxtbooks/pes/electrification_september2021
https://www.nxtbook.com/nxtbooks/pes/electrification_june2021
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https://www.nxtbook.com/nxtbooks/pes/electrification_september2020
https://www.nxtbook.com/nxtbooks/pes/electrification_june2020
https://www.nxtbook.com/nxtbooks/pes/electrification_march2020
https://www.nxtbook.com/nxtbooks/pes/electrification_december2019
https://www.nxtbook.com/nxtbooks/pes/electrification_september2019
https://www.nxtbook.com/nxtbooks/pes/electrification_june2019
https://www.nxtbook.com/nxtbooks/pes/electrification_march2019
https://www.nxtbook.com/nxtbooks/pes/electrification_december2018
https://www.nxtbook.com/nxtbooks/pes/electrification_september2018
https://www.nxtbook.com/nxtbooks/pes/electrification_june2018
https://www.nxtbook.com/nxtbooks/pes/electrification_december2017
https://www.nxtbook.com/nxtbooks/pes/electrification_september2017
https://www.nxtbook.com/nxtbooks/pes/electrification_march2018
https://www.nxtbook.com/nxtbooks/pes/electrification_june2017
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https://www.nxtbook.com/nxtbooks/pes/electrification_june2014
https://www.nxtbook.com/nxtbooks/pes/electrification_september2014
https://www.nxtbook.com/nxtbooks/pes/electrification_december2014
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