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charging a Battery using voltage range of 3 V to 12 V rangle...

Discussion in 'Power Electronics' started by Kamala, Sep 9, 2013.

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  1. Kamala


    Sep 9, 2013
    I am designing on a school project where my project is to charge rechargeable batteries using the following voltage range from 3V to 12 V.. If I am to charge an Li-ion batteries using the following input range.. The max allowable charge voltage for Li-ion batteries is to be 4.2V but since the lowest input voltage is 3V.... the input has to be 1 or 2 voltage higher than the output...I am struck as how i goes go about in charging an Li-ion batteries from the following voltage range from 3V to 12V... Suggestion are welcome...
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    You can use a current limited voltage source.

    Voltage is 4.2V current limited to whatever is appropriate for the battery.
  3. BobK


    Jan 5, 2010
    You will need a buck-boost converter to handle the input voltage range.

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