Aerospace & Defense Technology - December 2022 - 10

Power Supplies
Figure 2. MIL-STD-461 and DO-160 define the requirements for conducted and radiated electrical noise in military applications
large. Secondly, a capacitor that large
will require external circuitry to limit
inrush current.
A hold-up module (such as
GAIA'sHUGD-300) can help address
these challenges. This module charges
the capacitor at a higher voltage (usually
in the range of 31V DC to 80V
DC) and manages any inrush current
associated with the bulk capacitor.
As the energy stored increases by the
square of the voltage, this approach
results in a much lower value of the
bulk capacitor, which is also physically
smaller and more affordable.
Electrical Noise
Due to the enhanced efficiency and
smaller size, almost all DC-DC converter
modules are switching devices;
they switch the DC input to create an
AC waveform that is then regulated to
give the output DC voltage. As mentioned,
this approach enhances size
and efficiency. However, it also creates
the potential for electrical noise,
which can have a detrimental effect
on other system components if not
properly controlled. For this reason,
standards including MIL-STD-461 and
D0-160 define the maximum amount
of permissible noise, both conducted
and radiated.
Many converters contain some form
Figure 3. Multiple harsh environmental tests are applied to ensure the power modules withstand the conditions
they will be used in
10
mobilityengineeringtech.com
of inbuilt noise suppression for conducted
noise and a grounded metal
case significantly diminishes radiated
noise. For more stringent standards,
external filter modules (like GAIA's
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Aerospace & Defense Technology - December 2022

Table of Contents for the Digital Edition of Aerospace & Defense Technology - December 2022

Aerospace & Defense Technology - December 2022 - Intro
Aerospace & Defense Technology - December 2022 - Sponsor
Aerospace & Defense Technology - December 2022 - Cov1
Aerospace & Defense Technology - December 2022 - Cov2
Aerospace & Defense Technology - December 2022 - 1
Aerospace & Defense Technology - December 2022 - 2
Aerospace & Defense Technology - December 2022 - 3
Aerospace & Defense Technology - December 2022 - 4
Aerospace & Defense Technology - December 2022 - 5
Aerospace & Defense Technology - December 2022 - 6
Aerospace & Defense Technology - December 2022 - 7
Aerospace & Defense Technology - December 2022 - 8
Aerospace & Defense Technology - December 2022 - 9
Aerospace & Defense Technology - December 2022 - 10
Aerospace & Defense Technology - December 2022 - 11
Aerospace & Defense Technology - December 2022 - 12
Aerospace & Defense Technology - December 2022 - 13
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Aerospace & Defense Technology - December 2022 - 40
Aerospace & Defense Technology - December 2022 - Cov3
Aerospace & Defense Technology - December 2022 - Cov4
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