System and method of charging a battery using a switching regulator
First Claim
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1. An integrated circuit comprising:
- a switching circuit to provide a switching signal to a control terminal of a switching transistor, the switching transistor having a first terminal to receive power from a power source, a second terminal to provide power to a battery through a filter, and a control terminal;
a current control circuit to receive an input signal corresponding to a sensed current and to provide a control signal to the switching circuit to control the sensed current,wherein an output current into the battery from the second terminal of the switching transistor is greater than an input current into the first terminal of the switching transistor from the power source,and wherein the output current is reduced, in a current control mode, as a voltage on the battery increases.
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Abstract
In one embodiment the present invention includes a system and method of charging a battery using a switching regulator. In one embodiment, a switching regulator receives an input voltage and input current. The output of the switching regulator is coupled to a battery to be charged. The switching regulator provides a current into the battery that is larger than the current into the switching regulator. As the voltage on the battery increases, the current provided by the switching regulator is reduced. The present invention may be implemented using either analog or digital techniques for reducing the current into the battery as the battery voltage increases.
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Citations
64 Claims
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1. An integrated circuit comprising:
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a switching circuit to provide a switching signal to a control terminal of a switching transistor, the switching transistor having a first terminal to receive power from a power source, a second terminal to provide power to a battery through a filter, and a control terminal; a current control circuit to receive an input signal corresponding to a sensed current and to provide a control signal to the switching circuit to control the sensed current, wherein an output current into the battery from the second terminal of the switching transistor is greater than an input current into the first terminal of the switching transistor from the power source, and wherein the output current is reduced, in a current control mode, as a voltage on the battery increases. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 59, 60, 61)
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31. A method of charging a battery comprising:
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receiving power on a first terminal of a switching transistor on an integrated circuit from a power source; generating a switching signal from a switching circuit on the integrated circuit to a control terminal of the switching transistor; providing power from a second terminal of a switching transistor to a battery through a filter; generating, by a current control circuit, a control signal to the switching circuit based on a first signal corresponding to a sensed current, wherein an output current into the battery from the second terminal of the switching transistor is greater than an input current into the first terminal of the switching transistor from the power source, and wherein the output current is reduced, in a current control mode, as a voltage on the battery increases. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 62, 63, 64)
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Specification