ABNORMAL BATTERY DEPLETION DETECTION IN AN IMPLANTABLE DEVICE
First Claim
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1. A system, comprising:
- a coulometer configured to measure battery capacity;
a capacity-by-voltage device configured to use a sensed battery voltage to measure battery capacity;
a controller, coupled to the coulometer and the capacity-by-voltage device, the controller configured to combine the measurements from the coulometer and the capacity-by-voltage device, using a weighted average to determine battery capacity consumed; and
wherein the controller is configured to detect a drop in the sensed battery voltage below a specified threshold to identify a high-current depletion fault, the specified threshold determined as a function of battery capacity consumed as computed using the weighted average.
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Abstract
Abnormal battery depletion can be detected in an implantable medical device. Battery capacity consumed can be measured using a coulometer and using a capacity-by-voltage device, and the measurements can be blended to determine battery status. A drop in battery voltage below a specified threshold can be detected to identify a high-current depletion fault, and an alarm can be provided to indicate the fault has been detected. The specified threshold can be determined as a function of battery capacity consumed. Other aspects and embodiments are provided herein.
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21 Claims
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1. A system, comprising:
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a coulometer configured to measure battery capacity; a capacity-by-voltage device configured to use a sensed battery voltage to measure battery capacity; a controller, coupled to the coulometer and the capacity-by-voltage device, the controller configured to combine the measurements from the coulometer and the capacity-by-voltage device, using a weighted average to determine battery capacity consumed; and wherein the controller is configured to detect a drop in the sensed battery voltage below a specified threshold to identify a high-current depletion fault, the specified threshold determined as a function of battery capacity consumed as computed using the weighted average. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for detecting abnormal depletion for a battery in an implantable medical device, the method comprising:
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measuring battery capacity consumed by measuring a charge provided by the battery; measuring battery capacity consumed using a capacity-by-voltage measurement; blending, using a weighted average, measurements from the measured charge provided by the battery and the capacity-by-voltage measurement; detecting a drop in battery voltage below a specified threshold to identify a high-current depletion fault, the specified threshold determined as a function of battery capacity consumed as computed using the weighted average; and providing an alarm to indicate the fault has been detected. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification