flyback ac analysis with ltspice

Thread Starter

myil

Joined May 2, 2020
142
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?
 

Attachments

Papabravo

Joined Feb 24, 2006
19,576
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.
 

Thread Starter

myil

Joined May 2, 2020
142
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.
 

ericgibbs

Joined Jan 29, 2010
16,785
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
 
Top