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I need help with this charger

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adewaledipo

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After designing this charger, it worked but the ferrite transformer was getting so hot.

My ferrite transformer winding is 27 turns primary and 6 turns secondary
 
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this seems quite a popular design.... it pops upi all the time on this forum.

which transformer are you talking about ? And which core & size are you using ? And why are your turns ratios different ?
 

kripacharya said:
this seems quite a popular design.... it pops upi all the time on this forum.

which transformer are you talking about ? And which core & size are you using ? And why are your turns ratios different ?
Click to expand...

Thanks for your quick reply. I live in Nigeria and it is so hard for us here to get core sizes we want so I made do with one from a smps unit I bought here. I recoiled it to that spec so as to accommodate more stress. And I am using it to supply 12v dc. Pls advice. Thanks
 

Mr ade is it only the core that is heating up or with your mosfet?
 
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This design suffers from the danger that if the two half of the secondary are not perfectly balance the difference in voltage will result in a a current flowing back through the smoothing capacitors (the 4 X 47000). this will result in dissipation in the transformer/diodes/capacitors.
Frank
 

Ok but I did not recoil the secondary transformer as in the circuit
 

I think you problem there could be from your transformer.
 

I finally pulled a transformer from an atx power pack and am in the process of getting it fully installed
 

The circuit is a popular design check the frequency for 60Khz if it is ok then Check Transformer
 

Pictures of the new design. Please comment. I have tested the circuit without the chopper transformer, everything works well. I am going to test it with the chopper tomorrow.

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