mprather(at)spro.net
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 Posted: Wed Mar 24, 2010 6:45 am Post subject: Electrical surges in aircraft power supplies. |
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I believe "surge" means having the input voltage(s) above the designed for
limits for some amount of time. From this, it would be important to know
the device's design limits. Then you could figure out the best strategy
for protecting the device.
That said, keep in mind there will be voltage excursions on all vehicles.
Designers of devices for use on normal aircraft should have this in mind.
The only kind of over-voltage event that you as a system designer should
have to worry about is that of a runaway alternator - regulator full-on.
If your airplane has an internally regulated alternator, it's a good idea
to have a disconnect relay, and an even better idea to use an over-voltage
detecting circuit to open the relay should the alternator misbehave badly.
Everything else should be take care of by the equipment maker.
If you have a piece of equipment that is not built to operate on a normal
aircraft environment and you choose to use it anyway, there are a variety
of strategies one could use to provide protection for that device.
However, it may be difficult to know what needs to be protected, and how,
unless you know details of how the equipment was designed. You might
guess that you need something like a TVS (transient voltage suppression)
diode on the power inputs, but that would strictly be a guess.
Does anyone know if Blue Mountain did DO160 style design and testing?
Matt-
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Bob et al.
I have been able to get my BMA Efis G4 Lite repaired.
The fault may have been caused by a surge in the power supply line.
Is there an accepted method to catch surges in our type of electrical
systems?
Any help much appreciated.
Patrick C Elliott, England.
Long-EZ, G-LGEZ.
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