How feasible do you think this is?

Discussion in 'General Electronics Chat' started by thakid87, Mar 18, 2011.

  1. thakid87

    Thread Starter Active Member

    May 23, 2009
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    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.
     
  2. SgtWookie

    Expert

    Jul 17, 2007
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    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.
     
  3. thakid87

    Thread Starter Active Member

    May 23, 2009
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    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.
     
  4. SgtWookie

    Expert

    Jul 17, 2007
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  5. thakid87

    Thread Starter Active Member

    May 23, 2009
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    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?
     
  6. thakid87

    Thread Starter Active Member

    May 23, 2009
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    How would I PWM the AC signal to a range that is compatible with my transformer voltage?
     
  7. dha

    New Member

    Dec 25, 2008
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    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.
     
  8. thakid87

    Thread Starter Active Member

    May 23, 2009
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    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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