need little help with smps

uglykid

Member
2009-05-20 8:07 am
hi all.

im new in here, and now i need a little help.i have make a little smps with irs2153d controller, at the moment i use a transformer from a pc atx the frekvens is 50khz and i use a ligthbulb 12v 100w as load. when i connect the lightbulb to the secundare of trafo i have 12v full load on bulb but when i connect the lightbulb to the recitifer after caps (1000uf) and choke the voltage drops about 2,5 volts but there is still 12volts on the secundare of the trafo, so my ? is, is it the brigderecitifer ( 4*byv79e) or what is wrong...

and sorry for my bad english..

ls.
 

uglykid

Member
2009-05-20 8:07 am
hi again.

my choke is a amidon t130-2 and 30uh.

i have done a test and when i connect the bulb to the secondary of the trafo i got 11.7 volts and when i connect to the dc side i got 10.4 volt i think it´s ok because where is a voltage drop over each recitifier o.6-o.7 volt or am i total wrong...

LS