Smps Car Battery Charger

CHACALPOWERS

Member
2007-07-03 9:36 pm
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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CHACALPOWERS

Member
2007-07-03 9:36 pm
Thanks by comments

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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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
 
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...
 

megajocke

Member
2003-01-11 8:01 pm
Eva said:
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...

Eva, won't pulse-by-pulse current limiting tend to reinforce any imbalance on the balancing capacitor? The half period with the lower transformer voltage gets longer conduction time, decreasing its voltage even more for the next cycle and so on.

(http://www.fairchildsemi.com/an/AN/AN-7531.pdf)