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12v battery charger circuit

Aplicant

Nov 16, 2016
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Nov 16, 2016
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Hi to all
My car battery is 55A lead acid battery.I want to charge my battery with smps battery charger with tl494
Battery charger can only outputs 10a, 14.4v
But i want 4a to charge battery
Have you got any battery charger circuits based on tl494
Please share them if you have
 

Harald Kapp

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Nov 17, 2011
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The current limit is typically set up by a sense resistor, cf. figure 9 in the TL494 datasheet. By changing the value of the sense resistor you can adjust the current limit (higher resistance, lower current and vice versa).
 

Aplicant

Nov 16, 2016
18
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Nov 16, 2016
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In figure 9 5v/10a=0.5ohm
If we put a load with 0.3ohm to this circuit,what happens? 5v/0.3ohm=16.66a
Can This circuit always give 10a to this load and does circuit work fine?
 
Last edited:

Aplicant

Nov 16, 2016
18
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Nov 16, 2016
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18
I made this circuit
image.jpeg
It outputs 16v with no load ,with load 13.8
It can handle 200watt
For current limit i put 0.1 Rsense resistor for 10amper
Rsense drop voltage to pin 16 pin of tl494 and from ref 4k to 1 k to gnd for 1v to 15pin
Problem is that when i pul a load whose
resistance reach up to 9a my circuit works fine but when i put a load whose resistance reach up to 15a-16a,
My circuit doesnt work fine . It sounds chrrrrrrrrrr
I want 10a to both lower load and higher load i want to reduce noise
 
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