Problems with connecting my power supply to my tesla coil

Discussion in 'Power Electronics' started by gustav2, Mar 22, 2018.

  1. gustav2

    Thread Starter New Member

    Mar 22, 2018
    25
    0
    Hello, recently i built a tiny tesla coil bought from aliexpress, it can generate a tiny arc of about 5-10mm and it can play music. The only problem is when i connect it to my power supply the voltage on the supply drops from 24v to around 6 volts without drawing too much current, i get to see a arc for around half a second. However when i connect it to a 24 volt laptop power supply it works perfectly fine. Why doesn't this work with my normal psu? Does it have something to do with the radiation comming from the coil? My power supply is a home made one based on a ltc3780; a 10A 28V boost-buck converter connected to a 500 watt pc psu and a volt/ampmeter. The laptop psu is a 24volt 4A.
    Thanks for helping me out!
     
  2. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
    7,998
    1,355
    Clearly your psu isn't capable of giving out the current needed, or your current limit is set too low.
     
  3. dacflyer

    Active Member

    Nov 19, 2010
    31
    8
    sounds like your 500 watt PS is not putting out what you think it is,, look at the label for the outputs.
    which output voltage are you using ? the 12 volts supply and up are less current than the 5V and 3.3v they are where most of your current is.
    find you a beefier current PS for your needed voltage.
     
  4. gustav2

    Thread Starter New Member

    Mar 22, 2018
    25
    0
    I'm sure the problem is not the psu, i can connect a relatively heavy motor to it and run it at 14 volt 8 amps the psu doesnt have any problems with that. Also i did not limit the current. When i connect the tesla the voltage drops to 8 volt and it draws about 300mA. Im still thinking that it could be the coils electromagnetic field messing with the boost-buck controller but i have no clue how/why this effects the controller
     
  5. dacflyer

    Active Member

    Nov 19, 2010
    31
    8
    perhaps if you post a schematic of it all. and the power supply set up..
    your issue is baffling..
     
  6. whitehaired novice

    Member

    Jul 15, 2017
    277
    34
    You could move the power supply 8 or 10 feet away from the coil--if it still does not work you can eliminate interactive inductance. If it does work you can move the supply closer and closer to the coil and find where they begin to interact.

    I would guess that your power supply is shutting itself down to a low voltage, low current, probably because it is being overloaded by the coil.
     
  7. MisterBill2

    Distinguished Member

    Jan 23, 2018
    3,210
    628
    The difference in power supplies is that the one with the failing output is not able to handle the load. It is probable that the Tesla coil draws a higher current in brief pulses, and it is also probable that the power supply does not have an adequate output filter capacitance. AND, it may well be that it has developed a high resistance connection someplace. That does happen quite a bit.
     
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