Method and apparatus for using an external resistor for charging applications
First Claim
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1. An apparatus comprising:
- a battery charger control loop comprising a single external resistor, the loop configured to set a battery charge current of a battery and monitor an over-current condition of the battery.
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Abstract
A device using a single external resistor for battery charging applications and a software current feedback control loop for use with the external resistor is described. For instance, a single resistor can be used to determine the charge electrical current level being used to charge a battery. The determined level from the single resistor can be used in a feedback loop to set the charge electrical current level and to determine if there is an over current condition requiring the charge current be shut down.
63 Citations
20 Claims
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1. An apparatus comprising:
a battery charger control loop comprising a single external resistor, the loop configured to set a battery charge current of a battery and monitor an over-current condition of the battery. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A battery charging system comprising:
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a current source to generate current through a battery; a resistor to receive the current from the battery; a current sensor coupled to the resistor to determine the current from the battery using the resistor and to output a determined current level; and a controller sub-system to receive the output and to set the current through the battery based on the determined current level, and to shut down the current through the battery based on the determined current level. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method comprising:
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receiving a charge current determination of a current flowing through a single resistor; setting a battery charge current based on the determination; and monitoring an over-current condition based on the determination. - View Dependent Claims (17, 18)
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19. The method of 17, wherein setting comprises:
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comparing the determination with a predetermined charge current threshold; increasing the charge current if the determination is below the predetermined charge current threshold; and decreasing the charge current if the determination is above the predetermined charge current threshold.
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20. The method of 19, wherein monitoring comprises:
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comparing the determination with a predetermined over-current threshold; and shutting down the charge current if the determination is above the predetermined over-current threshold.
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Specification