Here is a new twist to using an ATX Power Supply

[clearchris]

Re: Here is a new twist to using an ATX Power Supply

Nice. I bet it was pretty quick to design too. 3d printers are great for stuff like this.

[sam_sam_sam]

Re: Here is a new twist to using an ATX Power Supply

I wanted have a way to test 18650 batteries charging a phone or tablet and use the battery testing machine that I have to see how long the running time would be

Now I have to work on the back cover for this project

Here is an update ( this is part of the back cover for the other project )

I bought these battery fixtures when I bought the battery tester machine but I did not like the way you have to hang them in mid air I was afraid that the battery would short out so I have not used them

Until the other day when the wheels started turning in my head on how to solve this problem

You will see how I resolved this problem

The 3D printer came to the rescue as you will see in the pictures below I still have more work to do it before it is finished

I will have remove the terminal connector out of the way so that it can move to the end of the travel
With the spacers makes it about two 3 mil meters longer than it was

It took a little while to make the 3D drawings
It was trial and error before I got some working spacer holders for this battery testing fixture

I have basically work on for the last two days ( not all day long but quite a few hours at a time )

I would draw it make a small section of it that I was trying to fit once I got this part done then I would work on the next part I need to fit then I did same thing for the other side but both sides are not the same

One note

The battery only goes into the spacer holder about a mil meter or so just enough to hold the battery in place

I also going to make some spacer holders for the batteries that are the same length but are fatter they have the same problem but not quite as bad

[budm]

Re: Here is a new twist to using an ATX Power Supply

There's a protection diode on the input, not sure if that's sufficient though. Otherwise, the circuit is rather simple. It uses an XL2001 buck converter, which does have output short detection at least. That might be what you are talking about or it might be a short in the device, I can't tell from the datasheet.



Here's a top view of the converter, and it's single sided, so nothing hidden underneath.
https://i.ebayimg.com/images/g/I0sAA...uu/s-l1600.jpg

If you look at internal circuit of the XL (or any other Buck converter topology), if that MOSFET connected between VIN and SW, it will pass full input Voltage to output.

[clearchris]

Re: Here is a new twist to using an ATX Power Supply

Yeah, if you are ready to gradute from MS 3d Paint, freecad is nice imho, I'm not ready to post the files to this one, but the box it's based on (including the usb buck converter mount) is up here:

https://www.thingiverse.com/thing:4126979/files

Design files included, so you can open it in freecad, not just the STL.

The real trick in designing for 3d printing is no overhangs. You can see the ways I designed it to accomplish that.

[sam_sam_sam]

Re: Here is a new twist to using an ATX Power Supply

A fuse is a pretty easy solution, good idea.

I designed a cradle that fits that module pretty much perfectly. There are two screw holes for a small plate with a lip that holds the back in. The front is held in place by the USB cut-out. There are four spaces, the bottom one is shown with the cover in place.

Very nice

[clearchris]

Re: Here is a new twist to using an ATX Power Supply

A fuse is a pretty easy solution, good idea.

I designed a cradle that fits that module pretty much perfectly. There are two screw holes for a small plate with a lip that holds the back in. The front is held in place by the USB cut-out. There are four spaces, the bottom one is shown with the cover in place.

[sam_sam_sam]

Re: Here is a new twist to using an ATX Power Supply

There's a protection diode on the input, not sure if that's sufficient though. Otherwise, the circuit is rather simple. It uses an XL2001 buck converter, which does have output short detection at least. That might be what you are talking about or it might be a short in the device, I can't tell from the datasheet.



Here's a top view of the converter, and it's single sided, so nothing hidden underneath.
https://i.ebayimg.com/images/g/I0sAA...uu/s-l1600.jpg

Here is what I would suggest doing is put a 2.0 amp fast acting fuse on input of this module just in case something goes wrong

How did you mount these modules in your enclosure

[clearchris]

Re: Here is a new twist to using an ATX Power Supply

There's a protection diode on the input, not sure if that's sufficient though. Otherwise, the circuit is rather simple. It uses an XL2001 buck converter, which does have output short detection at least. That might be what you are talking about or it might be a short in the device, I can't tell from the datasheet.



Here's a top view of the converter, and it's single sided, so nothing hidden underneath.
https://i.ebayimg.com/images/g/I0sAA...uu/s-l1600.jpg

[sam_sam_sam]

Re: Here is a new twist to using an ATX Power Supply

Do you have the schematic on the Buck converter?
The bad part about Buck converter is that if the Active switching shorted out, it will dump the full input Voltage to the output, you should install protection device on the output in case the short circuit happens.

Thanks for sharing information

Are these buck converter any good because I was thinking about getting a couple of them for a project I have in mind

https://www.ebay.com/itm/4V-38V-to-1...53.m1438.l2649

Or

Something like this

https://www.ebay.com/itm/2pcs-XL4015....c100005.m1851

[budm]

Re: Here is a new twist to using an ATX Power Supply

Do you have the schematic on the Buck converter?
The bad part about Buck converter is that if the Active switching shorted out, it will dump the full input Voltage to the output, you should install protection device on the output in case the short circuit happens.

[clearchris]

Re: Here is a new twist to using an ATX Power Supply

Sure, here you go. I have 4 of them in there. The can get warm, so I added vents, haven't had all of them going at once yet. Listing says 3a, but the datasheet for the chip says 1.8a. They work well though. There are some others similar, but without caps, don't get those.

https://www.ebay.com/itm/DC-DC-Buck-...Y/262503275432

[sam_sam_sam]

Re: Here is a new twist to using an ATX Power Supply

Like minds do sometimes think a like

I like what you have here but what did you use to convert it down to 5 volts ( I think I know which ones you used but just in case you found something different )

Can you post a link to them

I do have a question for you about your design with the USB cut outs did you make it fit the length of USB housing or did you do something different ( if you did something different how did you keep the USB connectors in place )

The only problem I had with what I did was the first time I plug in the USB cable it fit a little tighter than I would have liked but after installing it and removing it a few times it was easier to do

( I was very pleased with the way it turned out ) I just can not decide how and what I want to with bottom of this enclosure ( but I am leaning towards installing banana jacks for bottom of this case and putting a ON and OFF switch so I do not have remove the plugs in the banana jacks all time )

Did you tie the two center pins together on the USB connector or did use resistor network for your device that you plug into it

I want to build something like this for my truck to fast charge my phone and tablet but not quite as big as how you made yours but I want to barrow your idea

One other thing did you remove the switching power supply board from it case and installed in your enclosure or did you use a power jack to power the UBS enclosure

[clearchris]

Re: Here is a new twist to using an ATX Power Supply

Great minds think alike. I just did this the other day, it's a four port USB charger based on a laptop power supply and 4 usb buck converters. Pretty happy with the design, I'm going to make some light changes before releasing. It was really quick too, I used my previous design of the benchtop power supply as the base.

[sam_sam_sam]

Re: Here is a new twist to using an ATX Power Supply

“ I finally got my h**d out of my a** and now understand how use the program “


Well I finely got half of a project done that I have wanted to do for a long time

This object was created with Windows 3D Builder software

I wanted have a way to test 18650 batteries charging a phone or tablet and use the battery testing machine that I have to see how long the running time would be

Now I have to work on the back cover for this project

[sam_sam_sam]

Re: Here is a new twist to using an ATX Power Supply

Progress is going very slow on this project but I still working on

Well I have an update

I when to a training session yesterday and I finally got my h**d out of my a** and now understand how use the program

I made a test enclosure box which printed ok but it would have been better if I had enough filament on the real ( I use the sample that came with the 3D printer) but I got the concept down for the most part the screw holes were almost big enough for the screws that I going to use but that is an easy fix

I then made a USB enclosure [ front face ] ( proof of concept ) which come out the way I expected it to which I was very pleased with I still have to make the back end face to hold the circuit board ( I did not make the depth correct yet because the print time would have been a lot longer) print time was about 2 hours 100% fill in there is a reason for this ( most other proof of concept are at 25% fill in )

The size was 20 X 20 X *7.5* mm ( this measurement really need to 12.5 mm ) cutout was 12.5 X 5.5 X *12.5* mm * this was use to make it cut all the way through

I will show a picture of it tomorrow

The only problem I have with it was that the screw holes are not big enough ( way off the mark ) but I can fix it when I redo it again into an actual project case

I going to put a USB ports on this switching power supply project with a boost converter

I not very fast with this software yet but this might take a while to get the different device ( proof of concept down ) then put all the pieces together in one project enclosure

I have figure out how to countersink the screw holes that will take some doing with the software

[sam_sam_sam]

Re: Here is a new twist to using an ATX Power Supply

Progress is going very slow on this project but I still working on

[sam_sam_sam]

Re: Here is a new twist to using an ATX Power Supply

I have been working on the boost converter to be able to remotely adjust the voltage and current what a challenging idea to undertake not as easy as you might think

I have three wire cable that I wanted to use to keep the wires together but the wire size to big so I use component leads wrap around the wires so they would fit through the component lead holes that were already there

Here is a picture of the board now

Now I have to mount and wire this to the switching power supply
Also need to wire up the pot controls and trying to finish this project which I have been working on and off for last month

[sam_sam_sam]

Re: Here is a new twist to using an ATX Power Supply

I was surfing the EBay site and found this

4Pin PWM PC CPU Fan Temperature Control Thermostat Speed Controller

https://www.ebay.com/itm/DC-12V-3A-4...53.m2749.l2649

I going try these boards when they come in and see how well they work with the original fan that was in it if they work correctly then I will reinstall the original fan

I finally got these fan temperature sensor speed controller

I am testing one now and it seems work pretty good it allows you set the minimum speed and seems to respond to temperature but have tested its function completely yet which is the next thing I going to do soon

[clearchris]

Re: Here is a new twist to using an ATX Power Supply

I would love to but I seem not being able to get my head into how design it
And get over this learning curve

You just have to power through the initial pain, watch some youtubes on your chosen software. Don't think you can just start using them, you can't. The programs are incredibly powerful, but they are all quirky, and have a learning curve and obscure tricks you won't figure out unless shown. After using it a while, you can bang out designs very quick, and if you find something you like, you can modify it pretty quickly.

I did some modification to someone else's design and released this today. Took me maybe 15 minutes in freecad.

https://www.thingiverse.com/thing:4359500

It also help that the more you design, you can build a design library. Things that you know work and can just drop in. For example, those banana plug mount holes I have used in at least three designs so far. I just cut, paste, move into place and go. Now that I think of it, my first print of this came out perfect. Nice.

[sam_sam_sam]

Re: Here is a new twist to using an ATX Power Supply

I was surfing the EBay site and found this

4Pin PWM PC CPU Fan Temperature Control Thermostat Speed Controller

https://www.ebay.com/itm/DC-12V-3A-4...53.m2749.l2649

I going try these boards when they come in and see how well they work with the original fan that was in it if they work correctly then I will reinstall the original fan