600 v dc to 24 v dc possible??

Discussion in 'The Projects Forum' started by semsemhts, Mar 17, 2014.

  1. semsemhts

    Thread Starter New Member

    Mar 17, 2014
    15
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    I am working in the field of electric railway
    the overhead wire carrying 600 v dc
    I want a circuit to convert 600 v dc to 24 v dc
    please help
    by the way i am a mechanical engineer , mean i want some simple explanation
    thanks,,

     
  2. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    760

    Welcome !

    It is possible but I do not think we can't help you.

    Read the toS.

    But I'd say this, you might need a very high power resistor. it depends on your current requirements.
     
  3. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    Of course it's possible, it just depends on how much power you need and how badly you need it. For example, if you need 1 amp, you could get there with a 600 watt resistor; simple but impracticle. For any current over about 50 mA, or any isolation, you need a switching power supply. Although they are not as common as ones for more normal input voltages, I'm sure there are off the shelf units out there.

    ak
     
  4. bertus

    Administrator

    Apr 5, 2008
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  5. alfacliff

    Well-Known Member

    Dec 13, 2013
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    you stillhavnt said anuthing about how much current you need. a simple way to do it would be to get a 440 ac to 24 vdc switch mode power supply and feed it the 600 volts dc. the rectifiers will pass the dc and the supply will work the same as if it had 440 volts ac going in.
     
  6. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    Really?

    It's 600VDC u know
     
  7. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Why not simply with a 600v/24v transformer?
    Depending on what country you are in there are RR association regulations when operating into the control field.
    In NA it is the AAR.
    Max.
     
  8. alfacliff

    Well-Known Member

    Dec 13, 2013
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    because simply, a 600 to 24 volt transformer would not work on dc without a chopper, or other wise converting the 600 volts dc to pulses or ac.
     
  9. MaxHeadRoom

    Expert

    Jul 18, 2013
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    I missed the 600vdc!:(
    But even more I can see local Regs coming into it if there are any?
    It was not stated if this is required on the Loco or at a stationary point?
    Max.
     
  10. Experimentonomen

    Member

    Feb 16, 2011
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    The only solution i see here in a DC/DC converter like the one berus posted.
     
  11. quicksilver

    Member

    Mar 6, 2008
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    Do a search for "surplus sales of Nebraska". They may have what you need. Then download the PDF & do some research on the company (IF it's still in business) and show your supervisor. Check & see if it's acceptable. MANY items are made when the USA was a manufacturer (rather than after NAFTA passed) & therefore out of business. IF the materials have to be approved by certain safety organizations: you may be out of luck. But actually doing it (dropping it down) is not too tough, especially if the current is low. ceramic resistors & heavy bridge rectifiers are available from the above without paying big $. The issues I would imagine are safety, safety, safety & approval rating from various oversight organizations.
     
  12. Plasmahunt3r

    New Member

    Feb 6, 2014
    28
    2
    I had seen this circuit and I wanted to try it someday. It may suit your needs:

    http://www.eleccircuit.com/the-variable-high-voltage-power-supply-0-300v/

    You don't need the Transformer and the Bridge since you are already DC. You would need an appropriate 600v capacitor. You only need the components after the Bridge.

    If you try it, post the results. I want to know if it works.
     
  13. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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  14. Experimentonomen

    Member

    Feb 16, 2011
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    Linear regulators at these voltages ? Are you completely out of your mind ?

    At these voltages, a switchmode DC/DC converter is the only possible solution, nothing else will work.
     
  15. inwo

    Well-Known Member

    Nov 7, 2013
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    How did this thread survive?

    This mains supply will never use an isolation transformer on the input side.
     
  16. semsemhts

    Thread Starter New Member

    Mar 17, 2014
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    first of all : thanks for reply R!f@@
    the needed voltage about 28 volt dc & 60 Amp

    thank u
     
  17. semsemhts

    Thread Starter New Member

    Mar 17, 2014
    15
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    wouldn't it burn
    i am waiting for your replay
    thanks
     
  18. semsemhts

    Thread Starter New Member

    Mar 17, 2014
    15
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  19. semsemhts

    Thread Starter New Member

    Mar 17, 2014
    15
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    actually i searched in that company mentioned above but unfortunately i didn't find it
    by the way the current required is 60 amp and voltage required is 28 volt
    thanks a lot [​IMG]
     
  20. semsemhts

    Thread Starter New Member

    Mar 17, 2014
    15
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    the circuit mentioned to convert 220 v ac not 600 v dc , by the way the max. amp in this circuit is 100 mA.
    but the required current 60 amp .

    [​IMG]
    i am waiting for your answer
    thanks a lot
     
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