[Canberrauav] DC-DC switching regulators

Stephen Dade stephen_dade at hotmail.com
Mon Feb 8 22:35:37 AEDT 2016

Hi Carlos,


The radio monitoring equipment would be quite useful! It’d be useful for double-checking our ignition systems and power control modules are not interfering in the 2.4GHz (RC Control), 1.6GHz (GPS), and 920MHz (telemetry) bands.


We’re out at CMAC (www.cmac.org.au) every Sunday morning from 9am-12pm, so feel free to come along!








From: Canberrauav [mailto:canberrauav-bounces at canberrauav.org.au] On Behalf Of Carlos Peco
Sent: Monday, 8 February 2016 9:08 PM
To: Samuel Dudley
Cc: canberrauav at canberrauav.org.au
Subject: Re: [Canberrauav] DC-DC switching regulators


Hi Samuel (et al.),


My name is Carlos, just moved to Canberra from Sydney. I'm interested in UAV technology and have been looking at CUAV activities since I saw the OBC documentary on BBC.


Because of my work, I have access to some radio monitoring equipment and antennas (the demo stock we use for demonstrations and loans). They are not spectrum analyzers, that's another part of the company I have little to do with.

I'm more than happy to take some gear to the airfield one of these weekends to make noise fieldstrength measurements at the frecuency ranges of interest (remote control, GPS and the like) for different DC-DC converter configurations, if considered useful.




Le lundi 8 février 2016, Samuel Dudley <dudley.samuel at gmail.com> a écrit :


I noticed you were looking at GE critical power for a DC-DC switching regulators. I can only comment on the particular model which I have used and for my use case but the results were not great… No issues with the power rail but the RF noise that come off the module was considerable. On the regulated end I had around 2cm of cable exposed before entering a shielded cable run (shield was connected at only one end to a common -ve post off the main lipo). To be fair I was using the module as a plug and play brick and this particular module (similar to the later power brick) require external circuitry to meet the RF emissions specified in the datasheet.


 <http://au.element14.com/ge-critical-power/ehhd006a0b41-hz/dc-dc-12v-6a-1-8-brick-heat-plate/dp/2076849> http://au.element14.com/ge-critical-power/ehhd006a0b41-hz/dc-dc-12v-6a-1-8-brick-heat-plate/dp/2076849


When the module was powering the load (highly transient ~6A max) the digital radio in the room would stop working. It wasn't until I added a second identical DC-DC converter that problem really manifested. I didn't nail down exactly where the noise was entering the system but the frame loss on the 4 satellite spectrum receiver combined with possible induced noise on the lined to the 3DR PPM sum encoder was enough to corrupt the PPM signal to cause random full scale defections in the RC system even while idle.

Upon reflection the issue was present, but much less noticeable / diagnosable with a single regulator in place.


I switched over to the following part and now the digital radio works in the workshop :)

 <http://au.mouser.com/ProductDetail/Murata-Power-Solutions/UQQ-12-8-Q12PB-C/?qs=b13bmSh8y6zbImiRVI7nEQ%3D%3D> http://au.mouser.com/ProductDetail/Murata-Power-Solutions/UQQ-12-8-Q12PB-C/?qs=b13bmSh8y6zbImiRVI7nEQ%3D%3D




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