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DC-DC Converter

Discussion in 'General Electronics Discussion' started by imjeffd, Jan 6, 2014.

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  1. imjeffd

    imjeffd

    12
    0
    Jun 4, 2013
    Can a buck dc-dc converter like this http://www.ebay.com/itm/200962898162?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

    output more amps then go into the input
    example>> if you have a constant current supply of 1amp and 18v that's 18 watts if I used the buck converter and regulated it down to 9v would I get a output current capacity of 2amps or so and keep the 18watts of power I started with

    I ask this because I wont to regulate a 18v solar panel down to 4.2v and with a solar panel even when shorted out the amps don't increase that much it would be nice to keep as much of the watts as possible
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,449
    2,809
    Jan 21, 2010
    That's what they do.

    Assuming the voltage ratio (output/input) is less than the efficiency, the average output current will be higher than the average input current.
     
  3. BobK

    BobK

    7,682
    1,686
    Jan 5, 2010
    On the other hand, be aware that the peak input current will be higher than the output current.

    Bob
     
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