flyback converter secondary no load voltage increases

[phobos1]

hello my flyback converter secondary voltage increases slowly i dont know why does lack of snubber or incorrect snubber cause this. i'm using a irfp450 with 230v ac supply converted to dc and a filter cap of 10uf 250v. i have a primary inductance of 23mH. someone help me out.

 

[schmitt trigger]

It is impossible to help you, with so little information.

The irfp450 is a Mosfet, but what type of controller are you using?

At the very least, we require a full schematic with complete part values.
Also, output voltage and current, whether you are operating CCM or DCM, what is meant by slow (seconds, minutes, hours?).

 

[mtwieg]

It's likely an issue with the controller. Most controllers should have an automatic shutoff or cycle skipping/burst mode operation to deal with very light loads. What kind of feedback are you using?

 

[goldsmith]

hello my flyback converter secondary voltage increases slowly i dont know why does lack of snubber or incorrect snubber cause this. i'm using a irfp450 with 230v ac supply converted to dc and a filter cap of 10uf 250v. i have a primary inductance of 23mH. someone help me out.

Hi phobos1 !
What is your idea if you attach your schematic here and tell us more about specification of it and then asking for help ? you simply noticed that you have such a problem ! it can be caused by many of the parameters ! if you need help , you should deliver valuable information and schematic then many of the people here can guide ! ok ?

Best Wishes !
Goldsmith