Patent ID: 7948213
Filing Date: 2011-05-24
Classification: H02J

Abstract:
1. A method for charging a battery of an electronic device using a connected a/c power adapter, comprising the steps of: regulating an input voltage provided by the a/c power adapter to provide a regulated output voltage for charging the battery; applying the regulated output voltage to the battery as a charging voltage; determining a state of a transistor connecting the regulated voltage to the battery; switching a charging current applied to the battery between a quick charge level and a trickle charge level responsive to the state of the transistor; determining whether the a/c power adapter has been disconnected from the electronic device; generating a second control signal responsive to a determination that the a/c power adapter has been disconnected from the electronic device; and connecting the battery to the charging circuitry by turning on the transistor responsive to a second control input indicating the a/c power adapter has been disconnected from the voltage regulator.