Hi ,
For a bit of background , this is the same project here :
http://www.diysmps.com/forums/showthread.php?473-0-500V-SMPS-based-on-SG3525
In a nutshell , i am building a converter
12V ---> 400V(40mA) output.
I have one transformer which works as required and give the required performance with and without load.Under a load of 10k , it drops by about 10V,which is fairly acceptable.
Subsequently I had 3 more made of the same type.These give very poor performance.First the open voltage does not go higher beyond 380V.On the same load of 10k,the voltage drops by 100V.Except for the transformer , everything else is identical.
I am not able to get any meaningful inputs from the guy who wound the transformers.Are there any checks I could do to find out why this is happening ?
TIA.
For a bit of background , this is the same project here :
http://www.diysmps.com/forums/showthread.php?473-0-500V-SMPS-based-on-SG3525
In a nutshell , i am building a converter
12V ---> 400V(40mA) output.
I have one transformer which works as required and give the required performance with and without load.Under a load of 10k , it drops by about 10V,which is fairly acceptable.
Subsequently I had 3 more made of the same type.These give very poor performance.First the open voltage does not go higher beyond 380V.On the same load of 10k,the voltage drops by 100V.Except for the transformer , everything else is identical.
I am not able to get any meaningful inputs from the guy who wound the transformers.Are there any checks I could do to find out why this is happening ?
TIA.