SWITCHING BATTERY CHARGING SYSTEMS AND METHODS
First Claim
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1. An integrated circuit comprising:
- a switching circuit to provide a switching signal to the 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
Embodiments of the present invention include techniques for charging a battery using a switching regulator. Some embodiments include programmable switching battery chargers that can be configured using digital techniques. Other embodiments include switching battery chargers that modify the battery current based on sensed circuit conditions such as battery voltage or input current to the switching regulator. In one embodiment, the present invention includes a USB battery charger.
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Citations
10 Claims
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1. An integrated circuit comprising:
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a switching circuit to provide a switching signal to the 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)
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Specification