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Why does this device need an OR-Gate?

Discussion in 'Electronic Basics' started by Chris W, Apr 23, 2008.

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  1. Chris W

    Chris W Guest

    The device listed at the link below automatically switch the output
    between either a 12V (really 13.8V) power supply or a battery depending
    of if the power supply is on. It says it "uses two 80 ampere Schottky
    diodes connected as an OR-Gate to isolate the battery and power supply
    from each other." My question is what is the or gate used for? I
    understand to diodes to stop the Power supply from sucking power out of
    the batteries when it is off, but have on idea what advantage an or gate
    would give.


    http://www.powerwerx.com/product.asp?ProdID=2047&CtgID=3574


    --
    Chris W
    KE5GIX

    "Protect your digital freedom and privacy, eliminate DRM,
    learn more at http://www.defectivebydesign.org/what_is_drm"

    Ham Radio Repeater Database.
    http://hrrdb.com
     
  2. Chris W

    Chris W Guest

    I just read that again. I thought it said 2 diodes connected to an or
    gate. When it really says 2 diodes connected "AS" an or gate. I get it
    now. Never mind.

    --
    Chris W
    KE5GIX

    "Protect your digital freedom and privacy, eliminate DRM,
    learn more at http://www.defectivebydesign.org/what_is_drm"

    Ham Radio Repeater Database.
    http://hrrdb.com
     
  3. Bob Eld

    Bob Eld Guest

    It is just two diodes in series with the two power sources, one from the
    battery and one from the power supply. The cathodes of the diodes are
    connected together forming the output. This way current flows from the
    source with the highest voltage. Logically that is an "or" function. It is
    one "or" the other. If the two sources are the same voltage, both would
    supply current.
     
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