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12v battery charger circuit

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

Moderator
Moderator
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).
 
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:
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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