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  • why are laptop chargers 19 volt when batteries are only half that?

    From Ozix@ozix@xizo.am to aus.electronics on Sat Nov 19 10:00:24 2022
    From Newsgroup: aus.electronics

    ?
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  • From Sylvia Else@sylvia@email.invalid to aus.electronics on Sat Nov 19 14:23:55 2022
    From Newsgroup: aus.electronics

    On 19/11/2022 1:00 pmto , Ozix wrote:
    ?

    One possibility is the reduce the current, and therefore the thickness
    (and so cost) of the connecting wires and plugs and sockets. The voltage
    can be reduced, and the current correspondingly increased, with
    relatively little loss, on the motherboard. This would be done close to
    the battery connector so as to reduce the trace thickness needed on the
    board.

    Sylvia.
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  • From Computer Nerd Kev@not@telling.you.invalid to aus.electronics on Sat Nov 19 16:37:35 2022
    From Newsgroup: aus.electronics

    Sylvia Else <sylvia@email.invalid> wrote:

    One possibility is the reduce the current, and therefore the thickness
    (and so cost) of the connecting wires and plugs and sockets.

    Yep. In the case if the Thinkpads, they both increased the voltage
    from 16V to 20V and changed to a thicker cable and connector. It's
    likely they did that because the maximum power with the new power
    supplies is more than double the 72W maximum used with the 16V
    design.

    https://www.thinkwiki.org/wiki/Power_Connector
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