Battery capacity indicator for mobile medical equipment
First Claim
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1. In a system having a finite number of different operating modes that each draw a known amount of current from a battery, the combination comprising:
- a set of timers, one for each of said different operating modes;
means for enabling the corresponding timer to accumulate time values while the system is operated in any of its operating modes;
means for periodically calculating the current drawn from the battery, including means for multiplying the accumulated time value in each timer by the known current draw for its corresponding operating mode;
means for calculating the remaining capacity of the battery including means for summing the values calculated by the last named means, and means for subtracting the resulting sum from a value indicating available battery capacity; and
means for displaying the remaining capacity.
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Abstract
A mobile x-ray unit operates from a rechargeable battery in a number of different modes which draw current from the battery. Remaining battery capacity is calculated by integrating the current drawn from the battery in each of its operating modes, and periodically subtracting this value from a value indicative of remaining capacity. The result is displayed to provide an accurate indication of remaining battery capacity.
29 Citations
5 Claims
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1. In a system having a finite number of different operating modes that each draw a known amount of current from a battery, the combination comprising:
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a set of timers, one for each of said different operating modes; means for enabling the corresponding timer to accumulate time values while the system is operated in any of its operating modes; means for periodically calculating the current drawn from the battery, including means for multiplying the accumulated time value in each timer by the known current draw for its corresponding operating mode; means for calculating the remaining capacity of the battery including means for summing the values calculated by the last named means, and means for subtracting the resulting sum from a value indicating available battery capacity; and means for displaying the remaining capacity. - View Dependent Claims (2, 3, 4, 5)
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Specification