Need help for battery charging circuit

Discussion in 'General Electronics Chat' started by sudharshan.panduranga, Aug 7, 2008.

  1. sudharshan.panduranga

    Thread Starter Active Member

    Apr 10, 2008
    61
    1
    Hi....
    Can any one give idea for Battery charging circuit to meet following requirement.
    I am using 3.6v/600mAH rechargeable battery. This will charge from +5V DC supply.

    1. When the Battery is fully discharged, the +5v supply should provide 23mA current to charge the battery till it reaches +3V.

    2. After It reaches +3V the battery should consume required current.
     
    srisuresh likes this.
  2. iamspook

    Member

    Aug 6, 2008
    27
    0
    What it meant by 'consume required current'? Is this battery running a circuit while being charged? or is it a stand-alone charger?
     
  3. nanovate

    Distinguished Member

    May 7, 2007
    665
    1
    need to know what kind of battery also...

    Look at bq2057 from TI for lithium-ion batteries

    why 23mA?
     
  4. sudharshan.panduranga

    Thread Starter Active Member

    Apr 10, 2008
    61
    1
    The current limiting circuit is required till it charges to 3V.
    After it reaches 3V, Current limiting circuit should be inactive.
    Direct +5V should charge the Battery after it reaches +3V.
     
  5. sudharshan.panduranga

    Thread Starter Active Member

    Apr 10, 2008
    61
    1
    My project is Power supply generation module to get +15VDC from Line 3 phase CTs. I have derived +5V, +8V, +12V from the +15V constant voltage.
    I should get +15VDC constant voltage when Primary 3 phase Line current reaches 1A.
    *If Battery is connected to +5V directly, it can't get +15V at 1A current bcause of Battery current consumption.
    * Thiswill work if i adjust the battery current to 23mA around value.
     
  6. srisuresh

    New Member

    Nov 29, 2011
    2
    0
    Hello sir..

    I need a battery charging circuit diagram.

    Actually me planned to implement by using this circuit but some components are not available.

    So please tell a circuit diagram for charging 9V battery.

    THANK YOU
     
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