Patent ID: 9236752
Filing Date: 2016-01-12
CPC Classification: H02J

Claim Text:
1. A battery charging circuit comprising: a system power node for a connection to an external power supply; a battery node for a connection to a battery; a comparator circuit configured to produce a comparator signal in response to a voltage difference between the system power node and the battery node crossing a threshold value; a first detection circuit operable to produce a first signal indicative of a current flow into the battery, wherein the first detection circuit is an analog circuit; a second detection circuit operable to produce a second signal indicative of the current flow into the battery, wherein the second detection circuit comprises digital circuitry; a battery switch connected between the system power node and the battery node, the battery switch having an ON state and an OFF state, wherein the battery node is electrically connected to the system power node when the battery switch is in the ON state and electrically disconnected from the system power node when the battery switch is in the OFF state; and control logic configured to: