Back to results
US 8,541,983 B2Granted
Circuit and method of operation for an electrical power supply
AssigneeBlackBerry Limited
InventorsDusan Veselic, Martin George Albert Guthrie
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeBlackBerry Limited
InventorsDusan Veselic, Martin George Albert Guthrie
Estimating the term…
A battery charging circuit comprising: a semiconductor switch having an output connected to a rechargeable battery; a battery charge controller for receiving power from an external source, and supplying output power to a portable device and the input of the semiconductor switch, the current output of the battery charge controller being controllable; and a voltage sensing circuit for: measuring the voltage drop across the battery charge controller; and responding to the voltage drop across the battery charge controller by modulating the semiconductor switch to reduce the quantity of current supplied to the rechargeable battery when the voltage drop is too great; whereby the total power dissipated by the battery charge controller is controlled, the portable device receiving the power it needs to operate and the rechargeable battery receiving any additional available power.
A portable electronic device, comprising:
A portable electronic device including a graphical user interface and an interface for communicating with a communications network, comprising:
A circuit for a portable electronic device comprising:
A method for controlling a USB power supply to a rechargeable battery, comprising the steps of:
Dependencies are inferred from the claim text.