240VAC To 60VDC 300W Solution?

Discussion in 'General Electronics Chat' started by gbmhunter, Jul 8, 2011.

  1. gbmhunter

    Thread Starter New Member

    Apr 3, 2011
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    Hi,

    I'm looking for a solution for converting 240VAC mains to 60VDC for a homemade 48V LiFePO4 charger. I'm hoping for an output power of 300W or more.

    I know a decent amount about embedded design and general electronics, but not so much about power electronics and transformers.

    From what I can gather, there are a few practical ways of doing this.
    1. 4:1 Transformer -> Rectifier -> Cap Filter
    2. Rectifier -> SM Circuitry -> Some Kind Of Transformer -> Cap Filter
    3. Rectifier -> Some fancy power correction stuff -> Some Kind Of Transformer

    I am guessing that the switch-mode circuitry reduces the size of the transformer and capacitors (compared to first choice). The third seems quite complicated...

    I scoured the web for suppliers for transformers as to point me in the right direction, but it didn't really help (Digi-Key had about 750 power transformers but they didn't really seem suitable, then again I don't exactly know what I doing here...)

    Any help would be greatly appreciated.

    Cheers
     
  2. ifixit

    Distinguished Member

    Nov 20, 2008
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  3. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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  4. THE_RB

    AAC Fanatic!

    Feb 11, 2008
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    I second that, just buy an "off the shelf" 300W SMPS.
     
  5. #12

    Expert

    Nov 30, 2010
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    You can put identical transformers in parallel. I say this because it is hard to find the right 300 watt transformer for sale.
     
  6. gbmhunter

    Thread Starter New Member

    Apr 3, 2011
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    0
    O.K so the general consensus is 'don't make one unless you have to'. I did find a schematic of one on the internet that had been reverse engineered, quite complex...
     
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