Smps Car Battery Charger

CHACALPOWERS · 21st February 2008, 02:13 AM

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

EWorkshop1708 · 21st February 2008, 05:32 AM

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?

luka · 21st February 2008, 07:19 AM

Hi

Does it have current limiting? More pictures please

CHACALPOWERS · 22nd February 2008, 12:36 AM

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

luka · 22nd February 2008, 07:34 AM

Hi

3 cores for 30A version? Or was that for some other?

Eva · 22nd February 2008, 08:45 AM

Why are you not including current limiting? This yields an extremely easy to blow circuit.

CHACALPOWERS · 22nd February 2008, 11:35 AM

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

Eva · 22nd February 2008, 12:26 PM

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...

luka · 22nd February 2008, 02:58 PM

Hi

Why you need 3 cores for 30A? I have 25A output with one core only

CHACALPOWERS · 22nd February 2008, 03:52 PM

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

21st February 2008, 07:19 AM	#3
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	Hi Does it have current limiting? More pictures please __________________ home page @ http://www.classdaudio.tk/ @ 24/7 all year long I FEEL SLOVENIA

22nd February 2008, 07:34 AM	#5
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	Hi 3 cores for 30A version? Or was that for some other? __________________ home page @ http://www.classdaudio.tk/ @ 24/7 all year long I FEEL SLOVENIA

22nd February 2008, 08:45 AM	#6
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	Why are you not including current limiting? This yields an extremely easy to blow circuit. __________________ I use to feel like the small child in The Emperor's New Clothes tale

22nd February 2008, 11:35 AM	#7
CHACALPOWERS diyAudio Member Join Date: Jul 2007	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

22nd February 2008, 12:26 PM	#8
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	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... __________________ I use to feel like the small child in The Emperor's New Clothes tale


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21st February 2008, 05:32 AM	#2
EWorkshop1708 diyAudio Member Join Date: Nov 2004 Location: Florida	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?

22nd February 2008, 02:58 PM	#9
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	Hi Why you need 3 cores for 30A? I have 25A output with one core only __________________ home page @ http://www.classdaudio.tk/ @ 24/7 all year long I FEEL SLOVENIA

22nd February 2008, 03:52 PM	#10
CHACALPOWERS diyAudio Member Join Date: Jul 2007	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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