AC-to-DCPower Supply - LTSpice

Thread Starter

PsySc0rpi0n

Joined Mar 4, 2014
1,755
Hi...

I'm trying to simulate an AC-to-DC power supply converter. This is just something out of classes subject.

I have 2 versions. V1 has a Voltage regulator built by someone from this forum. V2 is built with a voltage regulator that I found around he web.

V1 is almost perfect but still has some ripple. V2 has almost no ripple but produces a peak voltage at the very beginning of the simulation.

The goal is to have a free ripple AC-to-DC voltage converter with no voltage peaks at the very beginning. I know that these 2 versions has different Vout values but I think we can adjust Vout value to whatever we want.

V1 is like 12V or 13V at Vout and V2 has Vout around 5V.

What can I do to improve the setups??


...V3.asc is an update to V1.
 

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ericgibbs

Joined Jan 29, 2010
18,766
hi Psy,
Being blunt, those three circuits are totally wrong, missing components.

Get the datasheet for the LM317 and study it.

Your regulator models do not display correctly on my PC.
 

Thread Starter

PsySc0rpi0n

Joined Mar 4, 2014
1,755
Well, I've followed some tutorial to build it... Why you say it's totally wrong?

I have just used a voltage regulator because it was suggested. I don't know that component!
 

Alec_t

Joined Sep 17, 2013
14,280
Under what name can I find the LM317?
Surprisingly the name is .... LM317 ;). It's in the Power Products folder.

Edit:
BTW, you can post .asc sim files rather than .zip (which many people distrust).
 

Thread Starter

PsySc0rpi0n

Joined Mar 4, 2014
1,755
Surprisingly the name is .... LM317 ;). It's in the Power Products folder.

Edit:
BTW, you can post .asc sim files rather than .zip (which many people distrust).
I can post .asc files but there were 2 more files, a .sub and a .asy. So, to avoid to upload 6 files, I zipped them!
 

ericgibbs

Joined Jan 29, 2010
18,766
Was this what you meant???
hi Psy,
Thats much better.:)

The next experiment you could do is to add a mains transformer to your circuit.
Also measure the 'heating' of the LM317 when powering different values of Load and the effect of the Vinp has on the LM317 dissipation.

E.

EDIT:
Added sim and image, it shows a range of transformer ratio's you may find helpful.
 

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Last edited:

Thread Starter

PsySc0rpi0n

Joined Mar 4, 2014
1,755
Morning Sir Eric...

Big thanks for that...

But I would like to understand why the example I posted couldn't work in real life!!

Thanks
Psy
 

Thread Starter

PsySc0rpi0n

Joined Mar 4, 2014
1,755
I have not enough knowledge to understand your circuit to an AC-DC power supply converter and why couldn't the other one work.

Maybe later I can understand.

Now I need to study for my exams!

Thanks for all the help!
 

ericgibbs

Joined Jan 29, 2010
18,766
I have not enough knowledge to understand your circuit to an AC-DC power supply converter and why couldn't the other one work.

Maybe later I can understand.

Now I need to study for my exams!

Thanks for all the help!
Hi Psy
Look at this clip from the LM317 d/s. it may help, it gives some explanation of the components.
E
 

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