Plz Help!! Emergency light circuit!

Discussion in 'The Projects Forum' started by aq_rules, Oct 29, 2009.

  1. aq_rules

    Thread Starter Member

    Oct 28, 2009
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    0
    I need to design a circuit that consist 12V7AH rechargeable battery which is charged at 13-14 Dc v....
    this battery will be connected to a 12DCV Lamp (which runs without any transformer or circuit when i directly connect it to battery)

    Now i want such a circuit in which 13-14DCV from the MAINS are charging the battery and whenever MAIN breaks down the Lamp turns on it self....

    Plz help..diagrams would be more prefferable


    Thanks In advance...
     
  2. aq_rules

    Thread Starter Member

    Oct 28, 2009
    168
    0
    Note:
    The battery should not be over charged...when it is full the circuit should stop charging it...
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Is this another homework assignment?

    You know that you really do need to research these kinds of things. There is a great deal of information out there.
     
  4. aq_rules

    Thread Starter Member

    Oct 28, 2009
    168
    0
    No it isn't a h.w assignment. . .i want dis lamp to be placed in my room
     
  5. Bernard

    AAC Fanatic!

    Aug 7, 2008
    4,170
    395
    Here is a control ckt. for battery-lamp minus charger which can be found elsewhere in AAC. With loss of AC , P ch MOSFET is turned on, turning on lamp R around 10k with MOSFET or darlington PNP transistor.
     
  6. aq_rules

    Thread Starter Member

    Oct 28, 2009
    168
    0
    I want to place a relay in dis ciruit!. . .plz help
    by the way thanks buddy
     
  7. Bernard

    AAC Fanatic!

    Aug 7, 2008
    4,170
    395
    Replace bulb with relay & diode.
     
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