Dc Dc converter for 12V PWM
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Hello can i use this kind of DC DC converter for PWM control my Noctua fan's :
and if how i must connect them together with Duet2 Wifi
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You can use that DC/DC converter to power your fans, and you can use your Duet board to PWM control the fans.
Not sure how much current you need but that looked mighty overkill and overpriced for stepping down the voltage to a few fans. Although it's probably a more solid build than the cheapest modules.
https://duet3d.dozuki.com/Wiki/Connecting_and_configuring_fans#Section_Using_12V_fans_when_VIN_is_24V tells you how to connect it depending on what you have and what you want.
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@bearer what doesn't appear to be covered in that doc is how to avoid creating an electrically noisey system? Was it implementation of buck converters that forced the addition of an external VIN to 5VDC board for RepRapPro's v0.6 boards?
Edit: @droftarts and @dc42 discuss the regulator in the following link. Main issue proposed (although not confirmed) as the cause of the noise is a switching regulator with an open magnetic inductor.
https://reprap.org/forum/read.php?340,395562
Edit 2: @T3P3Tony fixed the issue with "Lower noise components and circuit layout used for the 5V BUCK circuit." on the v0.8.5 boards.
http://blog.think3dprint3d.com/2015/08/new-duet-electronics-version-085.html?m=1
...but since a BUCK converter is a form of switch mode power supply I'm still none the wiser on what would make a low noise choise! Looking for 'low noise' in the description would be one approach but a standard or specific type to look out for would be a huge help.
Running 3 P3Steel with Duet 2. Duet 3 on the shelf looking for a suitable machine. One first generation Duet in a Logo/Turtle style robot!
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see
https://duet3d.dozuki.com/Guide/Ender+3+Pro+and+Duet+Maestro+Guide+Part+5:+Upgrades/54#s214this converts the fan outputs to 12V.
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@DocTrucker unless its a commercial application or powering particularly sensitive digitale circuits i doubt the converter should be an issue regardless of which type is used.
The discussion as far as i read dealt with radiated noise with respect to CE approval, of course it would be curtious of the home gamer to follow the same standards but ultimately less likely to be a pressing factor. Oddly enough even the cheapest tiny step down converters i have in my parts bin use shielded smd inductors.
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Yes it was a requirement to get Class A CE certification. With complaints about PT100 sensors suffering noise problems I try to adopt low noise solutions.
@bearer said in Dc Dc converter for 12V PWM:
Oddly enough even the cheapest tiny step down converters i have in my parts bin use shielded smd inductors.
If cheap systems are available which don't suffer the noise issue then it's not an issue - so long as we know what to look for!
Running 3 P3Steel with Duet 2. Duet 3 on the shelf looking for a suitable machine. One first generation Duet in a Logo/Turtle style robot!
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I have at home XL4015 it's that ok or no.
I have that DC DC Meanwell at home for that reason i implemente in my electronic.
if is that issue for PT100 then i will order LM2596 to reduce any noise.Or which solution to use with with 4 PT100 use on 4 tool's ?
Matej
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@matej1006 do you mean you already have the meanwell? I would be very surprised if that gave noise issues.
Sorry I high jacked your thread a little as I may need drop down dc-dc soon and don't have the meanwell available.
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@DocTrucker no worry it's helpfull for too so welcome to use that thread.
Yes i already have not original Meanwell it's china version. So i hope that will be OK.
I was thinking that LM2596 are without noise. now i get it that is Meanwell with out noise so i will gave i try
Matej
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I order 4 wire PWM Noctua fan's and i read that i need to connect 12 v directly and just FAN1- to PWM PIN on Fan ?with help of zener diode. Just that i would like to control 3 fan's with same pwm output.
Here is photolink text
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https://duet3d.dozuki.com/Wiki/Connecting_and_configuring_fans#Section_Connecting_4_wire_fans
the zener diode is for the tacho signal.
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OK and it's this tacho signal good to have or not?
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@matej1006
depends on your usecase.if you can see or hear the fan moving then no.
if you want to check from far away then yes.
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than is probaly good to have yes
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@Veti sorry
I have one problem this 3 PWM noctua fan's will be mounted to water chller for colling water.
and is there possible to code that way that there is not connected to any heater.
there will be just one sensor with will be mounted on tank for measuring water temp.Do you have any idea how to write that with new RRF3 code?
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@matej1006 said in Dc Dc converter for 12V PWM:
Do you have any idea how to write that with new RRF3 code?
you define a new tool.
that tool is assigned a heater with the thermistor that you want to monitor
the fan is configured to be thermistatically controlled based on that heater.you can configure that in the configurator
https://configtool.reprapfirmware.org/Heaters
add nozzle, add fan, add tool -
@DocTrucker said in Dc Dc converter for 12V PWM:
If cheap systems are available which don't suffer the noise issue then it's not an issue
(Hope this doesn't come across as mansplaining:)
All switching regulators will have more noise than a linear regulator, thats just the price we pay to increase the efficiency. Weather or not its a problem, depends on so many factors, but in this case it was for regulatory approval not stability, so if you're not selling it and it works, you're probably okay*
*) that being said if you make stuff that radiates so much noise your neighbors tv is affected it may turn into not being okay:P
The Meanwell, clone or no clone with the metal enclosure will radiate less noise, but any ripple on the output will still be greater than that of a linear regulator. Most tiny modules use the boxed square-ish flat inductors that are shielded which is the same sort of thing in use on today Duets boards as well. Ref picture below, the alternative is the ones where you see the coiled wire basically.
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@DocTrucker said in Dc Dc converter for 12V PWM:
With complaints about PT100 sensors suffering noise problems I try to adopt low noise solutions.
Newer PT100 daughter boards have additional capacitors, which in my tests were very effective at eliminating noise issues. It's possible to retrofit the capacitors to older daughter boards.
