what is problem with my problem with smps battery charger

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electronic4india

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hello everyone .

i need help for making smps 12v 20amp smps for battery charger.
i have pcb of smps using uc3845 and irf460 single mosfet and ee42
transformer . i try but it is not efficient maybe 45% or less. what is the reason of low efficiency .i think the reason of low efficiency is the transformer . can you
calculate the transformer for this smps and give me detail about this
transformer.
:|:|:|:|

sorry for my English too weak .
 

I never heard about an "EE42" transformer. Maybe it is a 50Hz transformer that works poorly at the high frequency of your SMPS circuit?
 

Hi,

EE42 are two E42 cores combined, if I remember right.

can you calculate the transformer for this smps and give me detail about this transformer.
Click to expand...
What "this" are you referring to?

A schematic, SMPS topology, input voltage, working frequency and the core material is the least to know to be able to calculate a transformer...

Klaus
 

hello guys ,
this is photo of my smps schematic,pcb and transformer .

- - - Updated - - -

KlausST said:
Hi,

EE42 are two E42 cores combined, if I remember right.


What "this" are you referring to?

A schematic, SMPS topology, input voltage, working frequency and the core material is the least to know to be able to calculate a transformer...

Klaus
Click to expand...

Hi Klaus ,

the transformer is e type and 42mm hight and 42mm width .
i send photo,
see the photo for conformation.

:bang:

please help ;
 

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You should go to nearest store who will definitely give you complete solution for this.
 

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