battery charger

Thread Starter

archie79

Joined Nov 23, 2012
1
Im kinda a newbie in the electronic world, so i apologize in advance if i seem to be talking nonsense. I have recently been looking at diagrams for battery chargers, and i built one the other day as a simple project. It worked fine, so that got me wondering about the chargers with the "ump start" capability.

I cant figure out how they get so much current out a step down transformer, or do they just use a large bridge rectifier off the main like car alternator? If anyone has a schematic for something like this i would like to build it as a project, or at least study it as a learning guide.
thanks in advance.
 

donpetru

Joined Nov 14, 2008
185
First, please show me the scheme that you did and after that I tell you what you did wrong. And just after that, I can show you another electronic diagram battery charger.. maybe a better electronic diagram.
 

wayneh

Joined Sep 9, 2010
17,495
I cant figure out how they get so much current out a step down transformer...
If it's drawing 10-15A from the wall (the max for a normal service outlet) and stepping it down to 14V or so, there's easily over 100A available. The units with still higher amps usually have an integral battery inside - it's just a mobile spare battery with leads attached.

Welding power supplies get to even higher current levels, at lower voltages.
 
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