Make a Li-ion battery charger with overcharge protection

Discussion in 'The Projects Forum' started by ahmedrmalik, Feb 8, 2016.

  1. ahmedrmalik

    Thread Starter New Member

    Jan 2, 2016
    7
    0
    Greetings!
    I want to make a circuit to charge THREE 3.7V li-ion batteries connected in series (total voltage = 11.1V). The circuit must include overcharging protection. And i want to be able to charge the battery as well as use the circuit powered by the battery (while its not being charged).
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,009
    3,233
    Is there a question there?
     
  3. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,986
    745
    Use a lm317 set to 12V, or lm7812,
     
  4. bertz

    Member

    Nov 11, 2013
    238
    31
    In past designs it was not allowed to have a load attached to a LiPo battery under charge because the charger is looking at current draw during the pre-charging and charging phases and voltage during the terminal phase. Having a load attached and drawing current made these measurements difficult and interfered with the charging process.
     
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