Patent ID: 7868486

Claim:
A system comprising: a power supply, which can be selectably coupled to one of a plurality of types of power sources external to the power supply, the power supply including: conversion circuitry which converts power received from the power sources to a DC voltage; and source determination circuitry which generates a signal indicative of a selected type of the power sources to which the power supply is coupled to receive the power, wherein the DC voltage and the signal are provided as outputs of the power supply; and an electronic device, external to the power sources and the power supply, which receives the DC voltage and the signal output by the power supply, the electronic device including a controller for controlling an amount of power drawn from the power supply by the electronic device in response to the signal, wherein the controller controls the amount of power drawn by the electronic device by disabling battery charging circuitry within the electronic device, while the electronic device receives the DC voltage output by the power supply.