I am trying to simulate a flyback converter on ltspice relying on christophe basso's designs. But I can't get a good result. I tried "tran and ac anlaysis" but couldn't succeed. Can anybody help me how to solve this?

 

hi myil,
Please post your asc file.
E

 

hi @ericgibbs,
I have just attached

 

hy myil,
This is what I see.
What problems are you having with the simulation.?
E

 

Excepting to get around 12V on Vout or at least some decimal numbers but i can't get any significant values. Please see attached for ref.

 

Can you tell me the page number and/or the drawing figure number? I have both editions of his book.
Q: how does the CTR of your PC817A compare to the required CTA of the feedback path? IIRC the CTR of the PC817A is less than impressive, especially as a function of frequency.

 

Can you tell me the page number and/or the drawing figure number? I have both editions of his book.
Q: how does the CTR of your PC817A compare to the required CTA of the feedback path? IIRC the CTR of the PC817A is less than impressive, especially as a function of frequency.

Chris Basso APEC seminar 2011.pdf (pagesperso-orange.fr)
Page:160

I know it could be slightly different by using different optocouplers but i can't see any voltage over X1(primary side of the transformer). So, I don't know if PWM-CM works as expected as it should.

 

hi myil,
Your PWM module is not running, even with a test voltage on Vctl.
E

 

hi myil,
Your PWM module is not running, even with a test voltage on Vctl.
E

Is the PWM-CM model faulty?

 

Chris Basso APEC seminar 2011.pdf (pagesperso-orange.fr)
Page:160

I know it could be slightly different by using different optocouplers but i can't see any voltage over X1(primary side of the transformer). So, I don't know if PWM-CM works as expected as it should.

I do not think your circuit is an accurate representation of those slides. Close, but no cigar.

 

I have run a quick test on the rest of the circuit, [without the PWM model] using a Vsrc as pulse gen and fast diodes, it outputs approx 12V.
E

 

I have run a quick test on the rest of the circuit, [without the PWM model] using a Vsrc as pulse gen and fast diodes, it outputs approx 12V.
E

Would you mind sharing the circuit?

 

hi myil,
It is very basic.

E
@myil ... I had the Opto reversed. !!