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Thread: 12v to 19v and some other question

  1. #11
    Newbie
    Join Date
    Oct 2010
    Posts
    10
    Quote Originally Posted by soundman98 View Post
    check the dc-dc power supplies first-- some have a low voltage cutoff adjustment-- these will shut off the pc more gracefully then other lvco's..
    so the powersupply to my laptop should include a voltage cutoff adjuster.
    I will consider this while browsing for my power supply
    thx

    then all i need to do is find a way to extend my screen and I should be up and running

    thx

  2. #12
    Raw Wave
    Join Date
    Nov 2009
    Posts
    2,119
    I agree with soundman - there are some great dc-dc converters with low standby currents and the handshaking required for graceful shutdown - ie, UPS functionality - PSU (dc-dc conv) sends "battery low - shutdown imminent"; PC starts shutdown; PSU shuts down when load drops or after a pre-adjusted time delay (or when battery is too low - ie, it collapsed quicker than anticipated).

    I have devised similar timed handshaking using the MW728 (it triggers a timer that hold power on), though just now I wondered if another great HVTO/LVCO kit can be internally tapped for handshakes. (The kit is the $22 Oatley Electronics (Australia) K227 - 12-24V Dual Battery Adapter For A Vehicle, but you need to solder & assemble and house it. But it has an adjustable voltage level & better delays than the MW728; uses a latching 80A relay; and only consumes 50uA else 500uA (0.5mA) with a LED. An has other potential mods given its circuit & operation description - not that I fully understood it!)

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