Circuit and method of operation for an electrical power supply
DC CAFCFirst Claim
1. A battery charging circuit comprising:
- a switch having an output connected to a rechargeable battery and configurable to isolate the rechargeable battery from a portable device;
a battery charge controller configured to receive power from an external power source and supply output power to the portable device; and
a voltage sensing circuit configured to;
respond to a voltage drop across the battery charge controller by modulating the switch to control a quantity of current supplied to the rechargeable battery such that the portable device receives a predetermined amount of power to operate and the rechargeable battery receives a reminder of the power available from the battery charge controller.
4 Assignments
Litigations
2 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.
27 Citations
20 Claims
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1. A battery charging circuit comprising:
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a switch having an output connected to a rechargeable battery and configurable to isolate the rechargeable battery from a portable device; a battery charge controller configured to receive power from an external power source and supply output power to the portable device; and a voltage sensing circuit configured to; respond to a voltage drop across the battery charge controller by modulating the switch to control a quantity of current supplied to the rechargeable battery such that the portable device receives a predetermined amount of power to operate and the rechargeable battery receives a reminder of the power available from the battery charge controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of charging a battery of a portable device via an external power supply, the method comprising:
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connecting an input of a battery charge controller to the external power supply; connecting an output of the battery charge controller, in parallel, to the portable device and an input of a switch; connecting an output of the switch to the battery; controlling current output of the battery charge controller; and responding to a voltage drop across the battery charge controller by modulating the switch to control a quantity of current supplied to the battery such that the portable device receives a predetermined amount of power to operate and the battery receives a reminder of power available from the battery charge controller. - View Dependent Claims (19)
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20. A power supply circuit comprising:
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means for measuring a voltage drop across a battery charge controller providing power to a portable device and an input of a switch in parallel; and means for responding to the voltage drop across the battery charge controller by modulating the switch to control a quantity of current supplied to a rechargeable battery such that the portable device receives a predetermined amount of power to operate and the rechargeable battery receives a remainder of power available from the battery charge controller.
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Specification