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12V power supply

jragruta

Dec 5, 2019
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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.
 

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Harald Kapp

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the 10 ohm resistor exploded
Which one? R1? There are two of them.
and outputs 3.88 uV.
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.
 

Harald Kapp

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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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