How feasible do you think this is?

Thread Starter

thakid87

Joined May 23, 2009
121
I am looking to build a 12/24V output battery charger for LA batteries with a "universal" input voltage ranging from 100-277VAC.

Most likely a few different models will have to be created, but I am trying to see if I am overlooking something.
 

SgtWookie

Joined Jul 17, 2007
22,230
You might have a look at Texas Instruments' UC2909/UC3909 switch mode lead-acid battery charger IC.

You'd need another PWM controller for the 100vac-277vac down conversion.

See the datasheet.
 

Thread Starter

thakid87

Joined May 23, 2009
121
Can you explain why I'd need a PWM controller? The 100-277 VAC is the input voltage range that I want to work with.
 

Thread Starter

thakid87

Joined May 23, 2009
121
Thanks for the help, Sgt. Wookie.

So far I have an idea of how I am going to power the individual 12 and 24V charging circuits. I am determining which regulators I am going to go with and going to do some testing with LT Spice. But, I can't get past the issue regarding the input voltage range that I am working with. If you don't mind, would you be able to offer some places where I can read up PWM an ac signal?
 

dha

Joined Dec 25, 2008
6
Look up the topic of buck regulators in google. You have to use buck regulation if you don't have a step-down transformer otherwise you are going to have a dangerous situation and a lot of heat. Basically, you need a switching type regulator, another topic to google.
 

Thread Starter

thakid87

Joined May 23, 2009
121
I've been doing more research on parts and it seems that I might have make several models. Obviously, I wanted to make just one model to work with my universal input voltage to charge 12 and 24V batteries. I just can't find any transformers to work at such a wide range.

I will read up on buck regulators/converters now.

Thanks!
 
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