Battery charger

Discussion in 'The Projects Forum' started by Barasha Mali, Oct 13, 2010.

  1. Barasha Mali

    Thread Starter New Member

    Oct 13, 2010
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    Hi i am a new ckt designer.I want to charge my 12 v dc battery and then use it as an inverter .Will using rectifier ckt with parallel capacitor connected to the battery work.
    Please help
     
  2. Kimrot

    New Member

    Sep 10, 2010
    2
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    what kind of help do u want?
     
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  3. Audioguru

    New Member

    Dec 20, 2007
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    He wants to blow up his battery with unlimited current instead of charging it with a controlled amount of current.
    There was no mention of sensing a full charge and shutting down the charger instead of over-charging.
     
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  4. wayneh

    Expert

    Sep 9, 2010
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    What's your question?

    I have one for you: What's your source of power with which to charge the battery? And here's another: Why use the filter capacitor? Your battery likely has much large capacity than the capacitor.
     
  5. marshallf3

    Well-Known Member

    Jul 26, 2010
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    What's your input source coming from?

    How big / what type is the battery?
     
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  6. Barasha Mali

    Thread Starter New Member

    Oct 13, 2010
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    sorry.........i dnt mention da details.
    I want to give an ac supply then using rectifier circuit will convert to dc.And use capacitance for the purpose of filtering.
    Now my problem is how do i sense the charging of the battery when it is fully charged.
     
  7. Barasha Mali

    Thread Starter New Member

    Oct 13, 2010
    15
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    I used 570 micro farad capacitor.How do i relate capacitance value and battery voltage.
     
  8. Barasha Mali

    Thread Starter New Member

    Oct 13, 2010
    15
    0
    sorry.........i dnt mention da details.
    I want to give an ac supply then using rectifier circuit will convert to dc.And use capacitance for the purpose of filtering.
    Now my problem is how do i sense the charging of the battery when it is fully charged.
     
  9. Audioguru

    New Member

    Dec 20, 2007
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    You need to learn about how a battery charger works.
     
  10. wayneh

    Expert

    Sep 9, 2010
    12,145
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    Again, filtering is useless with a battery (HUGE capacitor) in parallel with a regular (TINY) capacitor.

    If you want to avoid overcharge as simply as possible, you may want to employ a constant voltage regulator such as one based LM317T. This will reduce current as the voltage nears the setpoint. There are many other (and better) techniques for determining state-of-charge and controlling current based on that, but none quite as simple. What type of battery are you charging? Constant voltage is not so good a strategy for modern NiMH.
     
  11. Barasha Mali

    Thread Starter New Member

    Oct 13, 2010
    15
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    Yes..can you please suggest me a link where i can get it.
     
  12. wayneh

    Expert

    Sep 9, 2010
    12,145
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    google.com
     
  13. Barasha Mali

    Thread Starter New Member

    Oct 13, 2010
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    i am charging a 12v dc battery
     
  14. Barasha Mali

    Thread Starter New Member

    Oct 13, 2010
    15
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    Thnx..i wll try it using a voltage regulator.
     
  15. bertus

    Administrator

    Apr 5, 2008
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  16. marshallf3

    Well-Known Member

    Jul 26, 2010
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    If my guess is correct you're from India, and you need to take your 240 VAC 50 Hz (that often varies from 200 to 280V) to charge a 12V battery?

    Do you not have an auto parts store there? They would be able to sell you one for far less than what it could cost to build one.

    As to your converting the 12V back up that's another story.
     
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