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Transformer circuit simulation with proteus

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alamir2005

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I have some issue with transformer in proteus and I don't find any answers here

i want to make the following
**broken link removed**
on proteus

the transformer here is center taped at primary , not at secondary
and I don't find any such transformer inside the proteus

so can I set that and what values I should use as inductance and coupling ?
 

Proteus has a center tapped transformer. Just flip secondary with primary side.

Refer to basic enginnering knowledge for relation betwen inductance and windings ratio, e.g. https://en.wikipedia.org/wiki/Transformer

and use a reasonable coupling factor like 0.95 for the start. Higher coupling is possible with special windings design.
 

FvM said:
Proteus has a center tapped transformer. Just flip secondary with primary side.

Refer to basic enginnering knowledge for relation betwen inductance and windings ratio, e.g. https://en.wikipedia.org/wiki/Transformer

and use a reasonable coupling factor like 0.95 for the start. Higher coupling is possible with special windings design.
Click to expand...


thanks for the reply

you mean just making X mirror will make the center tap as output?
how X mirror will tell the proteus that this center belong the primary or secondary ?
this is the major problem

ya I know that it has center tapped but as secondary, not primary
if I flipped the transformer (x - mirror) what will tell the proteus which terminal are primary and which is secondary then ?
 
Last edited by a moderator:

Look at the model parameters, there's nothing specific for primary or secondary winding except windings ratio.
 

Are you somehow using all three terminals of the center-tapped primary at the same time?
If not then you just need a single primary winding for the simulation.
 

crutschow said:
Are you somehow using all three terminals of the center-tapped primary at the same time?
If not then you just need a single primary winding for the simulation.
Click to expand...

yes I use all of them
please see the image of the design here
**broken link removed**

as I need the cetner tap to apply 12V
 

In a different simulator I created the same inverter concept, and got it working.



The transformer has 2 adjustable specs: (a) primary inductance, and (b) turns ratio.

I used 3H, and .16. It is backwards as you can see. However it appears to work.

I think it is because dynamics in the secondary have an effect on the primary. Therefore the simulator works backwards, in a sense, to reach convergence.
 

A transformer model has no "direction". The coupling between windings is basically bidirectional. With a real transformer, the only significance of primary versus secondary is an add-on of 5 to 10 percent for the secondary winding to compensate for voltage drop at full load. When using a regular mains transformer "backwards" for a step-up converter, you need to consider this add-on.
 

BradtheRad said:
In a different simulator I created the same inverter concept, and got it working.



The transformer has 2 adjustable specs: (a) primary inductance, and (b) turns ratio.

I used 3H, and .16. It is backwards as you can see. However it appears to work.

I think it is because dynamics in the secondary have an effect on the primary. Therefore the simulator works backwards, in a sense, to reach convergence.
Click to expand...

sorry but I think this circuit should provide sine wave at the end , not the wave you output
am I right ?

FvM said:
A transformer model has no "direction". The coupling between windings is basically bidirectional. With a real transformer, the only significance of primary versus secondary is an add-on of 5 to 10 percent for the secondary winding to compensate for voltage drop at full load. When using a regular mains transformer "backwards" for a step-up converter, you need to consider this add-on.
Click to expand...

ahaa ok , thanks much for this point
 

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