Hi. I am trying to build a power supply which output is 2000VDC and 20mA (40W) input is 220V ac (european input).
I thought I can use flyback transformer. And I started to design. I selected duty cycle as %50 and frequency as 50kHz (actually I don't know how to select frequency and duty cycle because in every example I read was about stepdown and they didn't explained why choose these numbers) https://www.onsemi.com/pub/Collateral/AN-4140.pdf.pdf I am using this site to calculate and my calculatings are not giving the right solution. I calculated primary inductance as 2.8m and secondary as 497m. And I found also this site: https://research.ijcaonline.org/ncrenb2016/number2/ncrenb4037.pdf
But I don't know how to calculate or how to find Bmax.
Also when I try to simulate it with 1:10 -> with 3 secondary 173:1000:1000:1000 turns ratio I get result in image

Can someone help me or show me the way. Thanks a lot.

 

h,iraq,
Welcome to AAC.
How is the project powered and is it mains isolated.?

Read this AAC link. Ref Restricted Topics.
https://www.allaboutcircuits.com/user-agreement/

E

 

I didn't know. Ok then I am changing my question. Main is 220V AC from home electric.

 

No editing option?

 

I didn't know. Ok then I am changing my question. Main is 220V AC from home electric.

hi,
Do you have a mains isolating transformer between the mains and the project.??
E

 

1:1 maybe I can use as isolation.