SYSTEMS AND METHODS FOR MULTI-MODE BATTERY CHARGING
First Claim
1. A battery charger comprising:
- a current feedback loop, wherein the current feedback loop provides a pulse width modulated current control output;
a voltage feedback loop, wherein the voltage feedback loop provides a pulse width modulated voltage control output;
a transition control circuit, wherein the transition control circuit includes a digital phase/frequency detector operable to detect a duty cycle difference between the pulse width modulated current control output and the pulse width modulated voltage control output, and wherein the transition control circuit is operable to transition between application of a current charge to a charging node to application of a voltage charge to the charging node based at least in part on the difference in duty cycle.
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Abstract
Various systems and methods for battery charging are disclosed herein. As just one example, a battery charger is disclosed that includes a current feedback loop that has a pulse width modulated current control output, and a voltage feedback loop that has a pulse width modulated voltage control output. In addition, the battery charger includes a transition circuit with a digital phase/frequency detector. The digital phase/frequency detector is operable to detect a duty cycle difference between the pulse width modulated current control output and the pulse width modulated voltage control output. Further, the transition circuit is operable to transition between application of a substantially current charge control to a charging node to application of a substantially constant voltage to the charging node based at least in part on the difference in duty cycle.
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Citations
20 Claims
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1. A battery charger comprising:
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a current feedback loop, wherein the current feedback loop provides a pulse width modulated current control output; a voltage feedback loop, wherein the voltage feedback loop provides a pulse width modulated voltage control output; a transition control circuit, wherein the transition control circuit includes a digital phase/frequency detector operable to detect a duty cycle difference between the pulse width modulated current control output and the pulse width modulated voltage control output, and wherein the transition control circuit is operable to transition between application of a current charge to a charging node to application of a voltage charge to the charging node based at least in part on the difference in duty cycle. - View Dependent Claims (2, 3, 4, 5)
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6. A method for battery charging, the method comprising:
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providing a current charge control circuit, wherein the current charge control circuit is operable to provide a current charge control output; providing a voltage charge control circuit, wherein the voltage charge control circuit is operable to provide a voltage charge control output; providing a transition control circuit, wherein the transition control circuit is operable to seamlessly transition between application of a current charge to a charging node to application of a voltage charge to the charging node based at least in part on the current charge control output and the voltage charge control output. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A system for battery charging, the system comprising:
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a current charge control circuit, wherein the current charge control circuit is operable to provide a current charge control output; a voltage charge control circuit, wherein the voltage charge circuit is operable to provide a voltage charge control output; and a transition control circuit, wherein the transition control circuit is operable to seamlessly transition between application of a current charge to a charging node to application of a voltage charge to the charging node based at least in part on the current charge control output and the voltage charge control output. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification