36V Battery charger

Discussion in 'The Projects Forum' started by Johnny Enslin, Dec 30, 2012.

  1. Johnny Enslin

    Thread Starter New Member

    Dec 29, 2012
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    Need to build a permanently connected battery charger for a 36V 7Ah lead acid battery pack. On/off control on the 220VAC side. Considering utilizing a LM317 regulator with a Zener/diode combination on the Adj leg to get 43.5 volt output with 1A max. Will this work or am I going to release the smoke contained in the regulator?:D
     
  2. bountyhunter

    Well-Known Member

    Sep 7, 2009
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    You might be able to build a 1A charger using a LM317HV version. What is the input voltage source?
     
  3. Johnny Enslin

    Thread Starter New Member

    Dec 29, 2012
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    48V trafo, bridge rect and filter caps
     
  4. bountyhunter

    Well-Known Member

    Sep 7, 2009
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    Just be very careful not to exceed input voltage max for the part.
     
  5. Dodgydave

    Distinguished Member

    Jun 22, 2012
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    Johnny Enslin likes this.
  6. takao21203

    Distinguished Member

    Apr 28, 2012
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    I get 60 volts DC from a 36V toroid already.

    I would recommend a 12V electronic transformer, and a step-up converter.
    There are some cheap one's ready made, but only max. 35V
    you have to "tune" it a bit but easily possible.

    All these linear regulators are messy. For the money the heatsink costs, you can already buy a 12V / 35V converter. For a few volts more, you need to insert one small resistor.
     
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