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convert 110v dc to 24v dc

Discussion in 'General Electronics Discussion' started by elshorbagy01, Apr 9, 2016.

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  1. elshorbagy01

    elshorbagy01

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    Apr 9, 2016
    hello everyone, I need help
    I have an instrument that works at 24v dc and I have only source of 110v dc
    What can I do?
     
  2. Minder

    Minder

    3,119
    670
    Apr 24, 2015
    What is the nature and/or origin of the 110vdc?
    M.
     
  3. elshorbagy01

    elshorbagy01

    14
    0
    Apr 9, 2016
    Batteries, but I can't divide it , I have only one cable of 110v
     
  4. Minder

    Minder

    3,119
    670
    Apr 24, 2015
    What is the max current requirement of the 24vdc?
    M.
     
  5. elshorbagy01

    elshorbagy01

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    0
    Apr 9, 2016
    150 mA
     
  6. Minder

    Minder

    3,119
    670
    Apr 24, 2015
    I have done this with a simple resistor, 24v zener diode and electrolytic capacitor.
    It was on a mobile crane generator that output 240vdc and I needed 12v or 24v for a regulator circuit.
    This worked a treat.
    You have to calculate the value of the series resistor for the max 24vdc load.
    For 110vdc you will need a 12w 550 ohm ww resistor approximately, it is not the most elegant way, but uses the least components.
    M.
     
  7. elshorbagy01

    elshorbagy01

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    Apr 9, 2016
    may you draw that circuit
     
  8. Minder

    Minder

    3,119
    670
    Apr 24, 2015
    upload_2016-4-9_15-40-21.png
    Place a 100uf capacitor across the 24v zener diode, V2.
    M..
     
  9. elshorbagy01

    elshorbagy01

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    Apr 9, 2016
    thank you,
    and if you find another solution plz tell me
     
  10. duke37

    duke37

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    772
    Jan 9, 2011
    Many switch mode power supplies work on AC but the first thing they do is to rectify the AC to DC. They should be able to run on DC without modification.
     
  11. Colin Mitchell

    Colin Mitchell

    1,416
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    Aug 31, 2014
    Where do you get 110v DC from ????
     
  12. cjdelphi

    cjdelphi

    1,096
    104
    Oct 26, 2011
    You sure it's not wall 110ac voltage?
     
  13. elshorbagy01

    elshorbagy01

    14
    0
    Apr 9, 2016
    Batteries, but I can't divide it , I have only one cable of 110v
     
  14. elshorbagy01

    elshorbagy01

    14
    0
    Apr 9, 2016
    Batteries, but I can't divide it , I have only one cable of 110v
    And if i have Ac it will become easy by using transformer and rectifiers
     
    Last edited: Apr 10, 2016
  15. cjdelphi

    cjdelphi

    1,096
    104
    Oct 26, 2011
    I'm thinking a resistor divider / zener as mentioned which powers a microprocessor then use a switching method to an inductor to buck covert it

    Tricky
     
  16. elshorbagy01

    elshorbagy01

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    0
    Apr 9, 2016
    how to calculate the inductor and resistor to get 24v out of 110v
     
  17. duke37

    duke37

    5,364
    772
    Jan 9, 2011
    Making a switch mode supply is complicated and not for the novice.
    Why not use a standard 110V to 24V switch mode supply (buck convertor) as I mentioned earier?
     
  18. elshorbagy01

    elshorbagy01

    14
    0
    Apr 9, 2016
    i searched for that and i didn't find that rating,
    only max 40v dc buck convertor
    if you find one plz tell me
     
  19. AnalogKid

    AnalogKid

    2,520
    718
    Jun 10, 2015
    You can buy switching regulator modules that handle this input voltage range, or build one with a control chip fro Linear Technology.

    ak
     
  20. duke37

    duke37

    5,364
    772
    Jan 9, 2011
    I found several on e-bay 100-240V in to 24V DC power supplies.
    They specify 50 or 60 Hz input but I would expect them to work on DC.
    The advantage of these is that they come in a insulated case.

    I do not know how to copy the pictures here.
     
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