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car battery charger switching mode

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sg3524

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hi every one
can sombody help me with a schematic diagram for car battery charger switching mode
thank you
 

hello!
please be more specific about voltage and current of the battery
 

Hi,
I think the voltage is 12v, right? What is the current rating of your battery? That will determine the charging current required, in turn the charging power and so the circuit topology.

Hope this helps.
Tahmid.
 
thank you for all

for a car battery 12v 100amp
output voltage 13.8 / charging current about 25amp
 

Hi,
So you have to make a converter with rating 13.8x25 = 345watt. The choice at this power could be 2-switch forward or half-bridge. Half-bridge would be simpler. First, we have to know your previous experience and expertise on SMPS.
 

hi tahmid
i make chargers and inverters from 250va -- 4kva ( my own design ) for a long time since 1990 but at this time the transformer and scr is to expensive
my experience on smps is good , but the probleme is with ferrite core (in lebanon ) if you have a circuit with pc power supply or with cmponents or a simple one .
thank you tahmid
 

Hi,
Well, the PC power supply can be modified for 13.8v but it won't supply 25A. So, you have to build it from scratch. I would say use an SG3525, IR2110 and drive 2 high-voltage MOSFETs in half-bridge configuration driving a ferrite core. The output would be a full wave rectifier with schottky diodes and a feedback stage. The circuit should use a shunt and have short-circuit/overload protection. I'm assuming you're going with a float charger. In that case, all that is needed is to use the feedback stage to keep output fixed at 13.8vdc. If you've gotten that much, I'll explain further.

Hope this helps.
Tahmid.
 
hi
can you help me with the pc power supply ( can give between 10 an 15 amp ) with output 13.8
you have the circuit with sg and ir
 

Hi,
A google will give you modification of PC power supply, but standard ATX power supplies won't be able to give that much power.

For the SG, IR, this is a simple example. Be careful this is not a complete circuit, as there are many enhancements that can be made.
3_1288686737.jpg


Hope this helps.
Tahmid.
 
thank you hamid for this circuit i will study it and i tell you
 

ok tahmid ( tahmid from al hamd ? )
 

i'm arabic from lebanon
tahmid in arabic traduction it is al hamd
i'm sorry if i disturb you
 

Hi Guys
I'm trying to build a float charger using PIC16f876, the micro will send PWM signals to H-xfr via FETs and also incorporate Fdbk to keep the output voltage a bit constant.
Has anyone the Source code to achieve this?
many thanks
 

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