On 2014-11-25 21:17, James Knott wrote:
On 11/25/2014 02:57 PM, Anton Aylward wrote:
Why should any of this 'conversion' be inside the laptop (or the phone or tablet) since, when running the DC from the battery is stable? (or at least just dropping rather than doing ± AC).
Compare the battery voltage with the operating voltages for the devices. If they're not the same, and they're not, you'll need to convert to the required voltages. CPUs, for example, have lowered operating voltage from 5V, several years ago, to about 2V for modern ones. The reasons for this are heat dissipation and smaller dimensions within the device.
And most digital devices are very strict with the voltage they can use: say 5 ±0.25. Only some, like 4xxx CMOS, can be supplied directly from a battery; 2 to 19 volts, if I recall correctly. -- Cheers / Saludos, Carlos E. R. (from 13.1 x86_64 "Bottle" at Telcontar)