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Thread: Variable Tension, current limited, 10Amp Power Supply Unit

  1. #1
    Supporting Member Christophe Mineau's Avatar
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    Christophe Mineau's Tools

    Variable Tension, current limited, 10Amp Power Supply Unit

    Hi Folks,
    I am personally less and less prone to post the things I make (am I the only one with this feeling ?), well, let's see if this one gets interest :

    I'm on my way to prepare a homemade Metal plating setup, and for that I needed a power supply unit with good control on it.
    Here it is, it's a nice extension to the previous one I already showed :
    Benchtop Power supply
    Which was basically a re-spin of an old powerful ATX PC power supply, delivering 12V, 5V , 3.3 V and -12V

    Here, for plating application, I need more flexibility, so I made an extension to the ATX PSU, using a kind of magical board I discovered, which is based on the LTC3780 chip.
    This boad can take any DC tension as input, and can deliver , whatever the input level is, a 1V to 30V, up to 10Amp.
    So it's both a step up and step down regulator. All this is based on a digital circuit, and is quite sophisticated.
    You can find the boad on the usual online market places, I purchased mine for 20
    Look for
    "LTC3780 DC 12V Voltage Regulator Input 5-32V Output 1-30V Automatic Step Up Down Regulator Charging Module 10A"

    So, I basically replaced the onboad micro potentiometers by faceplate "macros" ones, added a nice little voltmeter and ammeter.
    First pot is for controlling output tension, second pot is for controlling current limitation.
    If you set the current limit under the level that requires your load, the board lowers the tension so that the current is what was set the limitation to.
    There is an other pot on board that sets an input under tension level, under which the boards stop working.

    I added a PC fan, just in case ...

    I put everything in a nice homemade wooden enclosure (no , it is not 3D printed, that's not the idea).
    It is powered by my ATX PSU, it can be 5V or 12V no difference.

    And here it is :







    (This may very well be my last one here)
    Cheers !
    Christophe
    ________________________________________________________________
    Visit my Website : http://www.labellenote.fr/
    Facebook : La Belle Note
    All my personal works, unless explicitly specified, are released under
    Creative Commons BY-NC-SA license.

  2. The Following 21 Users Say Thank You to Christophe Mineau For This Useful Post:

    baja (02-03-2020), bigtrev8xl (01-29-2020), cmarlow (02-02-2020), DIYer (01-26-2020), DIYSwede (01-28-2020), FEM2008 (01-28-2020), Jon (01-28-2020), Little Rabbit (02-02-2020), Moby Duck (02-02-2020), mr herb (01-29-2020), olderdan (01-27-2020), Paul Jones (02-01-2020), phred (01-28-2020), Rangi (01-28-2020), rebuilder1954 (01-28-2020), rlm98253 (01-28-2020), Saltfever (01-27-2020), Scotsman Hosie (02-02-2020), Sleykin (02-12-2020), threesixesinarow (01-28-2020), tonyfoale (01-29-2020)

  3. #2
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    Thanks Christophe Mineau! We've added your Variable DC Voltage Regulator to our Power Supplies category,
    as well as to your builder page: Christophe Mineau's Homemade Tools. Your receipt:




  4. The Following 2 Users Say Thank You to DIYer For This Useful Post:

    Christophe Mineau (01-26-2020), greyhoundollie (02-01-2020)

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    H0$$'s Tools
    Thanks Don’t be discouraged, please post more

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    Quote Originally Posted by Christophe Mineau View Post
    Hi Folks,
    I am personally less and less prone to post the things I make (am I the only one with this feeling ?),......

    (This may very well be my last one here)
    I hope this is not your last, and thank you for this useful post. I am an electrical and mechanical engineer, and I found your post very helpful. I'll share this with my colleagues, as we are always short on test supplies in the lab but have lots of old PC supplies.

    Kind regards

  8. The Following User Says Thank You to FEM2008 For This Useful Post:

    greyhoundollie (02-01-2020)

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    Supporting Member tonyfoale's Avatar
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    tonyfoale's Tools
    Christophe,

    Thanks for the tip on the LTC3780 chip, I shall follow up on that. I for one enjoy your well finished projects, but it is your choice whether you want to contribute in future. Do what you feel is best for you. I ask myself the same question whenever I make a post.
    Good luck with whatever decision you come to.

  10. The Following User Says Thank You to tonyfoale For This Useful Post:

    greyhoundollie (02-01-2020)

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    Supporting Member DIYSwede's Avatar
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    DIYSwede's Tools
    Thanks for the tip, Christophe - all the best!

    LTC3780 Data sheet for the curious of you out there, thinking "-This seems too good to be true?"

    https://www.analog.com/media/en/tech...ts/LTC3780.pdf

    -Anyone still believing this chip can crank out and deliver 24 V @ 10 A out of a single AA battery?

    No free lunches today, either - Sorry! But still a darned interesting chip and a clever application of it!
    I've got a few 12 VDC 750W server PSUs lying around that without sweat could feed this chip to the very top.

    Thanks
    Johan

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    greyhoundollie (02-01-2020)

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    jdurand's Tools
    Since the chip requires at least 4 V to operate...not likely.

    One thing to remember is these are all Watts to Watts converters with a loss due to efficiency. I typically figure a worst case of 80% efficiency.

    So, input current x input voltage x 0.8 = output current x output volts

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    greyhoundollie (02-01-2020)

  15. #8
    Supporting Member Christophe Mineau's Avatar
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    Christophe Mineau's Tools
    Thanks guys, for the encouragement and the good comments. Sometimes, I m really fed up with the social networks, and regret the golden Era of the Forums...
    Yes, that's true, it's watts for watts with the cost of inefficiency, but this little thing is rated 130 w, and the digital chip seems very clever to provide the best and minimize waste.
    The fan does not seem mandatory and the fact it doesn't heat too much makes me think it's quite efficient.
    It really is a good extension to an atx psu, which has actually far too much watts than necessary.
    I like it. Yesterday, I made my electrolytes with it, it sustained 10v 3A during 3hours and half, not even hot, so that's not a gadget.
    ,
    Cheers !
    Christophe
    ________________________________________________________________
    Visit my Website : http://www.labellenote.fr/
    Facebook : La Belle Note
    All my personal works, unless explicitly specified, are released under
    Creative Commons BY-NC-SA license.

  16. The Following 4 Users Say Thank You to Christophe Mineau For This Useful Post:

    greyhoundollie (02-01-2020), Little Rabbit (02-02-2020), Moby Duck (02-02-2020), Paul Jones (02-01-2020)

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    tonyfoale's Tools
    Quote Originally Posted by Christophe Mineau View Post
    The fan does not seem mandatory and the fact it doesn't heat too much makes me think it's quite efficient.
    It really is a good extension to an atx psu, which has actually far too much watts than necessary.
    I like it. Yesterday, I made my electrolytes with it, it sustained 10v 3A during 3hours and half, not even hot,.
    ,
    You are outputting 30 watts there, so at 80% efficiency you will only be heating your box with 7.5 watts. Fan not needed.
    However, if you run it at the full 130 watts (assuming that is output power) then the waste heat will be 32.5 watts, you may need the fan for that.

  18. The Following 2 Users Say Thank You to tonyfoale For This Useful Post:

    Christophe Mineau (01-30-2020), greyhoundollie (02-01-2020)

  19. #10
    Jon
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    Congratulations Christophe Mineau - your Variable DC Voltage Regulator is the Homemade Tool of the Week!

    This was another busy week with many nice tools, but this is a clever regulator that is powered by another homemade tool.

    Some more good tools from this week:

    Blacksmith's Third Hand by Little Rabbit
    Grinding Machine by liberal
    Brake by PowerMk
    No Tear Countersink Drilling Method by Paul Alciatore
    Anvil by Tuomas
    Pulley Tension Adjuster by thehomeengineer
    Dishwasher Rack Axle Replacement by rgsparber
    Dado Jig by Didpoolhall
    Pipe Welding Clamp by Kwandotechnic
    Pull Block by Make Things
    Push Block by Christofix
    3 Axis Welding Clamp by Made in Garage
    Articulating Work Rest by House_Work
    3 Axis F-Clamps by Kwandotechnic
    Materials Rack by PB Machines
    Small Vise Mount by Catfish
    Bench Vise by Mr.DK DIY
    Camera Stand by CharlesWaugh
    Leather Press by Turboconqueringmegaeagle
    Crosscut Sled by Didpoolhall


    Christophe Mineau - We've added your tool entry to our All Homemade Tool of the Week winners post, and you'll be receiving a $25 online gift card, in your choice of Amazon, PayPal, or bitcoin. Please PM me your current email address and award choice and I'll get it sent over right away.

    More importantly, this is your 10th Homemade Tool of the Week win! I've just added the golden wrench-on-pedestal graphic to the awards showcase in your postbit, visible underneath your avatar.





    You join these five other 10-time winners: rossbotics, mklotz, Vyacheslav.Nevolya, Tuomas, and tonyfoale. Congratulations again and good job

    Here are all 10 of your Homemade Tool of the Week winning tools:


  20. The Following 2 Users Say Thank You to Jon For This Useful Post:

    Christophe Mineau (02-01-2020), greyhoundollie (02-01-2020)

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