Smart and cost effective 12-V 160 AH lead acid battery charger

engmunir said:

Dear Experts
can u please tell me the transformer turns. in schematics of transformer there is 50 turns 2 layers. but below in description there is 25 turns 2 layers. can u please tell me how can i calculate turns ratio. how u calculate 50 turns 2 layers for 220 volt ac input and then 8 turns for 14 volt output.
Regards
MM Khan

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engmunir said:

Dear amjadali
thanks for your reply. do u have any 12 volt charger which is TL494 based. Is this UC3842 Charger is 100% working or is there any problem in its design?? if any problem then please tell me.

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engmunir said:

Dear Amjad
i have made pcb and installed all components. so please send me th bug free design both for uc3842 and sg3525. thanks

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engmunir said:

Dear Amjadali
you told me that 25+25 turns. but according to the switching frequency selected in uc3842 is 111.688 Khz. Rt=7K Ct=0.0022uf in your circuit. formula for frequency is f=(1.72/(Rt*Ct)). number of turns for primary is calculated by your below mention link is:

**broken link removed**

Number of turns primary = 50+50 turns because of centre tape.
Number of turns secondary = 8 turns

Now please told me what is accurate number of turns for primary winding. i have made all circuit except transformer winding.

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online79 said:

Can you help me to know how i build 48v 15amp charger with this design?

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amjadali56 said:

i am working both on UC3842 and SG3525 but time is the main problem/ and for this design i say it is not so feasible for you as it have some bugs and errors in it if you want i can fix and re-post it for you in a day or two.

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ulywae said:

Sir what part number of the component at 40v 30a? thanks

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