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donjohnston
Joined: 13 Dec 2009
Posts: 231
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 Posted: Sun Mar 24, 2019 3:28 am Post subject: noice filter (non aviation) |
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In my shop, I've got a Jet Air Filter with a remote control.
If it is plugged into the same circuit as the lights (LED), I can turn it on with the remote, but not turn it off or change the speed.
If it's plugged into a different circuit, then the remote works fine (regardless of whether the lights are on or off).
I'm guessing there's some type of interference on the line which is preventing the remote from working although I can't get my head around why.
I could rewire the outlet for the air filter so it's on a different circuit than the lights, but that would be a pain.
Is there some type of line filter that I could install which would resolve this so I don't have to rewire the outlet?
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nuckolls.bob(at)aeroelect
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| Posted: Sun Mar 24, 2019 9:07 am Post subject: noice filter (non aviation) |
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At 06:28 AM 3/24/2019, you wrote:
| Quote: | --> AeroElectric-List message posted by: "donjohnston" <don(at)velocity-xl.com>
In my shop, I've got a Jet Air Filter with a remote control.
If it is plugged into the same circuit as the lights (LED), I can turn it on with the remote, but not turn it off or change the speed.
If it's plugged into a different circuit, then the remote works fine (regardless of whether the lights are on or off).
I'm guessing there's some type of interference on the line which is preventing the remote from working although I can't get my head around why.
I could rewire the outlet for the air filter so it's on a different circuit than the lights, but that would be a pain.
Is there some type of line filter that I could install which would resolve this so I don't have to rewire the outlet? |
Most LED fixtures include some form
of power conditioning that provides
a constant current to the string of
leds over a wide range of input votlages.
These constant current generators operate
at the highest practical frequencies to
minimize weight and volume of the
driver components. They're pretty EMC
friendly for radiated emissions but
as you've discovered, perhaps not so
well behaved for conducted emissions.
How many light(s) are we talking
about? It's generally best to filter
off the noise at the antagonist as opposed
to protecting the victim. Depending
on your logistics, filtering the
victim may be the best choice. What
kind of power levels are we talking
about. How many watts consumed by
lights? How many by filter?
Bob . . .
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donjohnston
Joined: 13 Dec 2009
Posts: 231
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nuckolls.bob(at)aeroelect
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| Posted: Mon Mar 25, 2019 8:23 am Post subject: noice filter (non aviation) |
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At 06:30 AM 3/25/2019, you wrote:
Okay, this is a WAG but and inexpensive
experiment. Without getting into an EMC
lab to 'sniff out' characteristics
of the evil triad (victim/propagation-path/
victim), I'll guess that the remote receiver
in the filter is suffering conducted
interference from the lighting power
conditioners. Get one of these things
https://tinyurl.com/yywphdh8
and install it on your filter. This
will convert the cord on the filter
into the same style as your computer.
The filter's attenuation characteristics
look like this
[img]cid:7.1.0.9.0.20190325111420.05a3f320(at)aeroelectric.com.0[/img]
Not really significant below 30 Khz
or so . . . so I'm hoping that your
lighting power conditioners operated
above that frequency.
Bob . . .
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