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6V battery charger

Discussion in 'Power Electronics' started by Mostafizur Rahman, Feb 12, 2018.

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  1. Mostafizur Rahman

    Mostafizur Rahman

    Feb 12, 2018
    I need to develop a 6V, 4.5AH, Sealed lead Acid battery charger.

    In which,

    1. The charger indicator LED will turn ON only after connecting the battery.

    2. There will be two LED’s in the charger.

    3. One is for low battery indication (RED or Yellow LED)[ below 5 volt].

    4. One is for full battery indication [Greater than 6 or 6.5 volt, current consumption will less].

    If anyone can help me, I will be grateful to you.
  2. Nanren888


    Nov 8, 2015
    Mr. Google is my constant companion. Give him a try?
    What is your starting point?
    If you could give us an idea of your background, maybe someone can pitch an answer just right for you.
    You mention LEDs. Have any knowledge of current limits or resistors?
    Are you ok with transformers.
    If you want separate LEDs, the colours are pretty much just which colour you buy. (small voltage differences)
    Sorry, if it is too simple, just trying to get an idea of the starting point.
  3. Alec_t


    Jul 7, 2015
    Have a read of this, regarding recommended charging procedure.
    Welcome to EP!
    Tha fios agaibh likes this.


    May 20, 2017
    Charging sealed lead acid batteries is usually achieved with a 2 or 3 stage process.
    For the 2 stage process. they are initially charged by constant current. This because the general recommendation is for them to be charged at no more than 25% of current capacity.
    When the charge current drops below the set value the charger goes into constant voltage mode.
    The 3 stage process incorporates the above 2 plus a maintenance charge mode.
    The charge voltage is 2.35V per cell in the first instance and 2.3V per cell for the maintenance charge mode.
    This probably sounds quite complicated but is not. It can all be achieved with a few opamps a few transistors, resistors, capacitors and a zener diode. Plus of course the indicator LED's
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