CIRCUIT AND METHOD OF OPERATION FOR AN ELECTRICAL POWER SUPPLY
4 Assignments
0 Petitions
Accused Products
Abstract
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.
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Citations
45 Claims
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1-19. -19. (canceled)
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20. A portable electronic device, comprising:
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a switch configured to control a supply of power to a rechargeable battery; a controller configured to receive USB power from an external source and supply power to the portable electronic device; and a sensing circuit configured to determine power supplied to the portable electronic device, the controller responsive to the sensing circuit and configured to control the switch to limit battery charging from the external source such that sufficient power is provided for operation of the portable electronic device. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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28. A portable electronic device including a graphical user interface and an interface for communicating with a communications network, comprising:
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a switch configured to control a supply of power to a rechargeable battery; a controller configured to receive USB power from an external source and supply power to the portable electronic device; and a sensing circuit configured to determine power supplied to the portable electronic device, the controller responsive to the sensing circuit and configured to control the switch to limit battery charging from the external source such that sufficient power is provided for operation of the portable electronic device. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36)
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37. A circuit for a portable electronic device comprising:
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a switch configured to control a supply of power to a rechargeable battery; a controller configured to receive USB power from an external source and supply power to the portable electronic device; and a sensing circuit configured to determine power supplied to the portable electronic device, the controller responsive to the sensing circuit and configured to control the switch to limit battery charging from the external source such that sufficient power is provided for operation of the portable electronic device. - View Dependent Claims (38, 39, 40)
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41. A method for controlling a USB power supply to a rechargeable battery, comprising the steps of:
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sensing a voltage drop across a controller; and responsive to the voltage drop, limiting battery charging from the USB power supply such that sufficient power is provided for operation of a device by modulating a switch to control a quantity of power to the rechargeable battery. - View Dependent Claims (42, 43, 44, 45)
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Specification