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12V power supply

Discussion in 'Power Electronics' started by jragruta, Dec 5, 2019.

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  1. jragruta

    jragruta

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    0
    Dec 5, 2019
    Hi. Im using livewire to simulate this circuit (attached below). I need a 12V DC output power supply and i cant seem to output it. I have only basic knowledge of electronics and in need of help on how to improve this. When i turned the explosions setting in the simulation, the 10 ohm resistor exploded and outputs 3.88 uV. What should I do? Thank you.
     

    Attached Files:

  2. Harald Kapp

    Harald Kapp Moderator Moderator

    9,544
    1,970
    Nov 17, 2011
    Which one? R1? There are two of them.
    Of course. Without supply from the transformer output voltaeg is 0 V. The 3.88 µV observed are imho artecaftcs from the simulation.

    Check the voltage at the output of the transformer and across C2. What does it read?
    Try ramping up th einput voltage from 0 V to 220 V to avoid too high an inrush current into C2. Or set initial conditions for the simulations such that the voltage across C2 is 12 V. This will reduce the inrush current which may be the cause for the observed behavior.
     
  3. jragruta

    jragruta

    2
    0
    Dec 5, 2019
    upload_2019-12-5_21-4-25.png
    This is the measured voltage across C2. I turned off the explosions feature of the simulation. The values are changing from 14 to 15 V.
     
  4. Harald Kapp

    Harald Kapp Moderator Moderator

    9,544
    1,970
    Nov 17, 2011
    14.24 V across C2 are perfect. Remember that the 220 V at the input are rms. At the output of the rectifier you'll see peak values (rms* sqrt(2)) minus the pass voltage of 2 diodes (~1.4 V).
    This all looks pretty normal.
    Have you tried my suggestions to minimize inrush current?
     
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