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why are laptop chargers 19 volt when batteries are only half that?
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Ozix
Nov 18, 2022, 9:00:39 PM11/18/22
to
?
Sylvia Else
Nov 18, 2022, 10:23:58 PM11/18/22
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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.
> ?
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.
Computer Nerd Kev
Nov 19, 2022, 1:37:53 AM11/19/22
to
Sylvia Else <syl...@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
>
> One possibility is the reduce the current, and therefore the thickness
> (and so cost) of the connecting wires and plugs and sockets.
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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