IEEE Power Electronics Magazine - June 2019 - 68

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FIG 2 How KEMET tantalum capacitors looked in 1959. (Source:
KEMET archives; used with permission.)

Because the size and weight of vehicles have a direct
impact on efficiency and range, the space for electronic
modules is always at a premium. As a result, these modules may be located in harsh areas (such as under the hood
where temperatures are elevated) or reduced in size with
minimal cooling, which creates further thermal challenges.
The higher voltages present in modern vehicles mean that
capacitors now need higher-rated voltages-up to 900 V for
the capacitors used in the electric powertrain-requiring
improvements in the dielectric materials that are used. Moving the standard in-vehicle voltage from 12 to 48 V for many
systems has required using 75/80 V-rated capacitors that are
able to withstand the equally higher transient voltages.
KEMET's aluminum electrolytic capacitors are used in
many places throughout vehicles, including within modules,
such as electronic control units. Developments have produced 80 V-rated devices with capacitance values of up to
900 μF that offer operating temperatures as high as 160 °C
with a road map to achieve 175 °C.
Hybrid electrolytic capacitors combine the benefits of traditional electrolyte-based (wet) aluminum electrolytics with
that of polymer aluminum electrolytics, which enhances the
performance. This new technology can be used in applications with ripple currents above 26 A. Possibly the greatest
advance here is that the equivalent series resistance is not
only reduced to <5 mΩ, but it also becomes independent
of the applied voltage and temperature. This ensures highperformance levels under all operating conditions. Because
of these characteristics, smaller components can be used to
save space, or the same size components can be used to provide higher performance.
Automobiles are electrically harsh environments, and, with
the switching of large currents to the motors, transients are
increasingly creating an environment for capacitors to suffer
damage during use. KEMET's polypropylene-based film capacitors offer excellent self-healing properties, making them ideal
for demanding automotive applications.

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IEEE Power Electronics Magazine - June 2019

Table of Contents for the Digital Edition of IEEE Power Electronics Magazine - June 2019