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Old 21st February 2008, 02:13 AM   #1
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Default Smps Car Battery Charger

Hi dears. This is my battery charger (SMPS), light, small and strong.
I like it so much, this is a 30A version, but, there are 60A and 90A too.
All comments are wellcome.

Thanks.

CHACALPOWERS
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Old 21st February 2008, 05:32 AM   #2
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VERY Nice!!!!

I like how you re-used a computer PSU case.

What did you do to make this charger? What kind of transformer did you use to get the 12V+ output?

Schematics?
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Old 21st February 2008, 07:19 AM   #3
luka is offline luka  Slovenia
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Hi

Does it have current limiting? More pictures please
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Old 22nd February 2008, 12:36 AM   #4
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Hello SMPS builders

I'm your fan, because I learn so much with all you. Than you very much.
The battery charger/power supply don't have a current limiter, only a input fuse to prevent overload or short circuit, ok?

The PWM card work with SG3524, 2SC954/2SA733 buffers, IRFP264 mosfets in the output and the output transformer was build with 3 PC power supply output transformer (together) Ae = 3,6cm2 and no load the input current is only 0,04A (40mA).

I will post some schematics in the future for you.

Here a pic of the SMPS rear side.

Thanks

CHACALPOWERS
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Old 22nd February 2008, 07:34 AM   #5
luka is offline luka  Slovenia
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Hi

3 cores for 30A version? Or was that for some other?
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Old 22nd February 2008, 08:45 AM   #6
Eva is offline Eva  Spain
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Why are you not including current limiting? This yields an extremely easy to blow circuit.
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Old 22nd February 2008, 11:35 AM   #7
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Default cores & current limit

HI luka
Yes, 3 PC power supply cores for 30A version only.

Hi Eva, I'm your fan, ok?
When I built the SMPS my time very short, but I want install a current limiter shutdown based in the next version. About this, what the best way to action the shutdown in the SG3524 (your suggestion)?

Thanks

Chacalpowers
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Old 22nd February 2008, 12:26 PM   #8
Eva is offline Eva  Spain
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Method 1:

Replace SG3524 by SG3525A and use the shutdown pin to terminate each cycle in case current rises above a certain threshold. This requires some "slope compensation" for stable operation into limiting.


Method 2:

Use a shunt to sense output current and one or two op-amps with suitable frequency compensation to reduce target output voltage or duty cycle in order to keep current below the limit.

And so...
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Old 22nd February 2008, 02:58 PM   #9
luka is offline luka  Slovenia
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Hi

Why you need 3 cores for 30A? I have 25A output with one core only
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Old 22nd February 2008, 03:52 PM   #10
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Default cores

Hi luka

I don't know "why" but my cores are "EI33' , Ae=1,2cm2 aprox. X 3 = 3.6cm2.
74Khz switching, 2 X IRFP264. (115VAC version).

Regards

Chacalpowers
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