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Registered Member #1646
Joined: Mon Aug 18 2008, 10:44PM
Location:
Posts: 1
Hello, I want to make a batterycharger for a array of gel batteries. The current charger i'm using is pulling to much power from my generator.
So I want to build a new battery charger now and I need ideas for that.
I want to control both current and voltage with a microcontroller. That's because the batteries need a quite advanced charging programme. First stage of the charge it must be current limited, after that voltage limited and after current drop below a certain level a different voltage limit.
So let's sum up the facts: 380Vac 3 phase generator 43.2-56.4V output 40A maximum charging current Microcontrolled current and voltage
Registered Member #1370
Joined: Mon Mar 03 2008, 09:01AM
Location: Finland
Posts: 56
You could rectify the 3~ input and convert it to low voltage with a monster smps. Other solution could be a big transformer, which will be expensive unless found from junkyard (welder transformers etc.) or done with MOTs. For variable voltage, a linear regulator could be one, however with high losses.
Registered Member #639
Joined: Wed Apr 11 2007, 09:09PM
Location: The Netherlands, Herkenbosch
Posts: 512
A smps would be the most efficient option, but you'll need a huge ferrite core for the transformer. But controlling suck monster smps with a micro-controller would be difficult because of the EMI.
Registered Member #639
Joined: Wed Apr 11 2007, 09:09PM
Location: The Netherlands, Herkenbosch
Posts: 512
Dr. Arc wrote ...
here is good 40 ampere smps
the guy also has lots of other intreating little gizmos on his page
The only problem is that it's 13.8 V (500W). He needs an variable smps that's capable of delivering 2.3 KW. He also stated that it should be controlled with a micro processor, so it would need al lot of failsafe protection hardware.
Another topology that might be suitable is a buck-boost converter, but this might be a lot harder to design and build.
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380Vac 3 phase powered 40A 43.2-56.4V battery charger
