Howto Phase-shifted Full-Bridge Converter PSFB

[umit]

When you've put the TL431 right in place, including the correct wiring, then
change your simulation command from .tran 10m 1m to .tran 10m 1m uic
This will show up the simulation graphs after 1msec, which is 10% of the 10msec of the total simulation time.

You can observe the sim.-process on the bottom left.

There are many topics in the simulation settings. Can you tell me exactly which part I should change?
because the simulation didn't work again

 

[umit]

When you've put the TL431 right in place, including the correct wiring, then
change your simulation command from .tran 10m 1m to .tran 10m 1m uic
This will show up the simulation graphs after 1msec, which is 10% of the 10msec of the total simulation time.

You can observe the sim.-process on the bottom left.

I want to ask you: Can you set the simulation time and place of TL431 and send the circuit again? I need this very much, please.

 

[Udo]

Have you copied/pasted TL431A.asy and TL431A.lib into the LTspice lib directories ?
If not, do this first, because I have modified the schematic, so you can use TL431A in your circuits without an include command !!

Now, open the files, which I've attached below. It should work !!!!! as you can see from the plots.

Concerning the simulation command, l left the "maximum time step" open. The reason is, if you type in very small values, such as < 100ns (10ns for instance)
the simulation time gets very long and you might think......it's not working.

 

[Udo]

@ umit.
Is it working now ?

 

[umit]

@ umit.
Is it working now ?

Hello, thank you again for your interest and help,
I think the circuits worked this time.
I am sharing the screenshots as well. Is it true ?

 

[Udo]

It looks ok.
The circuit using UC3879 was just my demo circuit.
If you have other parameters for your specifications, you can proceed by using the equations applied in the Converter incl. the UC3875 chip.
Regards
Udo

 

[umit]

It looks ok.
The circuit using UC3879 was just my demo circuit.
If you have other parameters for your specifications, you can proceed by using the equations applied in the Converter incl. the UC3875 chip.
Regards
Udo

THANKS, can I write to you if I need anything again?

 

[Udo]

Yes, but my service is limited to minor issues. I can't make a complete development free of charge.

 

[umit]

Yes, but my service is limited to minor issues. I can't make a complete development free of charge.

No problem, can you make improvements for a fee? I can pay the necessary fee.
For example,
Can you add a new soft switching circuit to this circuit and perform power factor correction?

 

[Udo]

You will find a PFC-circuit under
"Foren"\Themen finden\Aktive PFC-Schaltung........

 

[kalanadesilva]

Hi Udo,
Can you please let me know how to download theh zip file ?
It gives me an error message

Oops! We ran into some problems.​

 

[spicer]

Hi Udo,
Can you please let me know how to download theh zip file ?
It gives me an error message

Oops! We ran into some problems.​

Press "Danke" first.

 

[kalanadesilva]

Press "Danke" first.

Thank a lot!!

 

[Udo]

Dir umit,
did you replace the TL431 (model TL431.mod) by the TL431A. I'm attaching the TL431A lib. Delete the TL431.mod in your circuit and place the TL431A instead.
Error 1 should no longer appear. As mentioend earlier, all files need to be in the same directory. Check if you have all of them.
Furthermore, you can get rid of the message "Pseudoanalysis" if you add uic in the .tran command. Use .tran 10m 1m uic.
Try again my circuit - attached below in the zip file -, which must run automatically. After 1msec of delay, the .plt-file will open, showing up the plots identical to the screenshots., also attached in the zip-file.
Furthermore compare your netlist with the one I've also attached. If there are differences, we will be able to have a closer look to manage the problem.

------
Udo

 

[Udo]

@kalanadesilva
Do you still have the question "How to download the zip-file"? Right click on it and store it in your favorable LTspice-directory. Unzip that file to get access to the unzipped files.
-----
Regards
Udo