Method and apparatus for monitoring battery discharge state
First Claim
1. A processor-accessible medium storing a processor-executable program that, when executed, causes monitoring of discharging of a battery in order to detect when a charge level of said battery decreases to a point where said battery becomes subject to a low voltage condition, including:
- periodic sampling of a voltage of said battery and an ambient temperature in order to obtain a sample that includes a temperature value and a voltage value;
saving of each said sample in a sample group;
selecting a subset of said samples in said group, wherein the temperature value of each said sample in said subset is lower than the temperature value of substantially all of said samples of said group other than said subset; and
determining as a function of the voltage of at least one said sample in said subset whether said battery is subject to the low voltage condition.
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Abstract
One aspect of the invention involves: periodically sampling a voltage of a battery and an ambient temperature in order to obtain a sample that includes a temperature value and a voltage value; saving each sample in a sample group; selecting a subset of the samples in the group, wherein the temperature value of each sample in the subset is lower than the temperature value of substantially all of the samples of the group other than the subset; and determining as a function of the voltage of at least one the sample in the subset whether the battery is subject to a low voltage condition.
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Citations
40 Claims
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1. A processor-accessible medium storing a processor-executable program that, when executed, causes monitoring of discharging of a battery in order to detect when a charge level of said battery decreases to a point where said battery becomes subject to a low voltage condition, including:
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periodic sampling of a voltage of said battery and an ambient temperature in order to obtain a sample that includes a temperature value and a voltage value; saving of each said sample in a sample group; selecting a subset of said samples in said group, wherein the temperature value of each said sample in said subset is lower than the temperature value of substantially all of said samples of said group other than said subset; and determining as a function of the voltage of at least one said sample in said subset whether said battery is subject to the low voltage condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An apparatus comprising:
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a battery; a voltage sensor responsive to a voltage of said battery; a temperature senior responsive to an ambient temperature in the region of said battery; and a circuit that is coupled to said voltage and temperature sensors and that monitors discharging of said battery in order to detect when a charge level of said battery decreases to a point where said battery becomes subject to a low voltage condition, wherein said circuit; periodically uses said sensors to sample a voltage of said battery and an ambient temperature in order to obtain a sample that includes a temperature value and a voltage value; saves each said sample in a sample group; selects a subset of said samples in said group, the temperature value of each said sample in said subset being lower than the temperature value of substantially all of said samples of said group other than said subset; and determines as a function of the voltage of at least one said sample in said subset whether said battery is subject to the low voltage condition. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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Specification