Mailinglist Archive: opensuse (1620 mails)

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Re: [opensuse] UPS : replacing battery with 12 volt Jelly Car Battery
On 11/25/2014 10:35 AM, Anton Aylward wrote:
On 11/25/2014 01:19 PM, Lew Wolfgang wrote:
The laptop will have small DC-to-DC converters and/or regulators to
develop the needed voltages. With 19-VDC from the wall-wart they've
got plenty of "headroom" to run their regulators. Note that there are
other voltages running around in there to power the CPU, which uses
something around 2.2-VDC I think.
19V to 2.2V is one hell of a drop!

Yup, that's why it's done with switching power supplies. Resistive
regulators would waste a lot of power.


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