16 / 84
The
energy-efficiency
of
devices with power supply
units is essentially influenced
by the inductor. To calculate
the ideal power inductance,
a solution has been found
that reduces losses in core
materials: a simple online tool
that accurately determines AC
losses.
Successful energy-efficient device-
design depends largely on the
power supply unit and therefore
on the composition of its individual
components. So, when selecting these
components - such as inductors (coils
or rather inductances), for temporary
energy storage for example - it is
important to understand their loss
and heat behavior. By introducing new
materials and calculating AC losses
using various calculation models, the
ideal power inductance for energy-
efficient applications can be measured
and ascertained.
Whilst linear regulators were the most
widely used voltage regulators in the
past, switch mode power supplies are
now predominantly found in modern
power electronics. The continuous
reduction in processor voltages has
played its part in this. Just a few years
ago, switching frequencies of up to
300 kHz were widespread. Nowadays
modern switching controllers usually
have frequencies of 800 kHz or more.
Switching losses, on one hand, but
also power inductor losses, on the
other, are important aspects in the
design of switching power supply
units. The latter can be influenced
by the materials-mix. Conventional
calculations of core losses using
the Steinmetz-equations, quickly
reach their limits. A new tool from
Würth Elektronik eiSos based on
a metrological approach, helps
the developer determine the most
accurate data to date for DC and
AC current losses in power inductors
within the application environment.
Reduction of core material
losses
By introducing new iron alloy group
material
compositions,
Würth
Elektronik eiSos has further reduced
core material losses for high current
power inductors. Its component range
WE-MAPI combines the optimal use
of inductance and current carrying
capacity with low internal losses
thanks to clever material selection
and manufacturing technology.
Conventional coils typically use
enamelled copper wire wound around
Calculating the Ideal Power Inductance for
Energy-Efficient Applications
Alexander Gerfer, Ranjith Bramanpalli, Jochen Baier, WURTH
16 l New-Tech Magazine Europe