Digital battery capacity warning device
First Claim
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1. A voltage monitor for sensing the output voltage of a voltage source and producing an indication when said output voltage falls below a threshold voltage, said voltage monitor comprising:
- voltage sensing means for sensing said output voltage and including means for comparing said output voltage with said threshold voltage and generating an output when said output voltage is less than said threshold voltage;
status storage means coupled to said voltage sensing means for storing said output and generating an accumulated status;
comparator means for comparing said accumulated status with a first predetermined number when said output voltage has been sensed a second predetermined number of times; and
output means for providing said indication when said accumulated status is equal to or greater than said first predetermined number.
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Abstract
A voltage monitor and method enables the monitoring of a DC input voltage. The input voltage is continuously scanned and compared to a predetermined threshold. The result of the comparison is periodically stored in a shift register along with previous scan results. When a predetermined number of stored scan results indicate an out of range input voltage, a digital output changes state to provide indication of the abnormal condition.
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Citations
39 Claims
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1. A voltage monitor for sensing the output voltage of a voltage source and producing an indication when said output voltage falls below a threshold voltage, said voltage monitor comprising:
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voltage sensing means for sensing said output voltage and including means for comparing said output voltage with said threshold voltage and generating an output when said output voltage is less than said threshold voltage; status storage means coupled to said voltage sensing means for storing said output and generating an accumulated status; comparator means for comparing said accumulated status with a first predetermined number when said output voltage has been sensed a second predetermined number of times; and output means for providing said indication when said accumulated status is equal to or greater than said first predetermined number. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A battery voltage monitor for sensing a depletable battery voltage and producing an indication when said battery voltage falls below a first threshold voltage, said battery voltage monitor comprising:
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threshold generating means for generating said first threshold voltage and a second threshold voltage; and voltage sensing means for sensing said battery voltage, including means for comparing said battery voltage with said first threshold voltage and generating an output when said battery voltage is less than said first threshold voltage; status storage means coupled to said voltage sensing means for storing said output and generating an accumulated battery status, said accumulated battery status comprising a voltage representing the number of times said battery voltage was sensed to be less than said first threshold voltage; comparator means for comparing said accumulated battery status with said second threshold voltage and generating a comparator output when said accumulated battery status is greater than said second threshold voltage; output means responsive to said comparator output for providing said indication; power supply means for generating a regulated supply voltage level and coupled to said means for comparing, said comparator means, said status storage means and said threshold generating means. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method for sensing the output voltage of a voltage source and producing an indication when said output voltage falls below a predetermined threshold voltage, said method comprising:
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sensing said output voltage; comparing said output voltage with said threshold voltage and generating an output when said output voltage is less than said threshold voltage; storing said output and generating an accumulated status; comparing s id accumulated status with a first predetermined number when said output voltage has been sensed a second predetermined number of times; and producing said indication when said accumulated status is equal to or greater than said first predetermined number.
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18. A method for sensing a depletable battery voltage and producing an indication when said battery voltage falls below a first threshold voltage, said method comprising:
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sensing said battery voltage; comparing said battery voltage with said first threshold voltage and generating an output having a first state when said battery voltage is less than said first threshold voltage and a second state when said battery voltage is more than said first threshold voltage; periodically storing said output; combining said stored output to generate an accumulated battery status voltage; comparing said accumulated battery status voltage with a second threshold voltage; and producing said indication when said accumulated battery status voltage is greater than said second threshold voltage. - View Dependent Claims (19, 20)
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21. A voltage monitor for sensing a voltage source output voltage and producing an indication upon an abnormal condition of said voltage source output voltage, said voltage monitor comprising:
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voltage sensing means for sensing said voltage source output voltage; first comparator means for comparing said voltage source output voltage with a threshold voltage and generating a first output when said voltage source output voltage is less than said threshold voltage; status storage means coupled to said voltage sensing means for storing a preselected number of said first outputs and generating an accumulated value; and second comparator means coupled to said status storage means for comparing said accumulated value with a predetermined value and generating said indication when said accumulated value is equal to or greater than said predetermined value. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
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30. A battery voltage monitor for sensing a depletable battery voltage and producing an indication when said depletable battery voltage signifies an abnormal condition, said battery voltage monitor comprising:
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threshold generating means for generating a first threshold voltage and a second threshold voltage; voltage sensing means coupled to said threshold generating means for sensing said depletable battery voltage;
;first comparator means coupled to said voltage sensing means for comparing said depletable battery voltage with said first threshold voltage and generating a first output when said depletable battery voltage is less than said first threshold voltage; status storage means coupled to said first comparator means for storing a preselected number of said first outputs and generating an accumulated battery value; second comparator means coupled to said status storage means and said threshold generating means for comparing said accumulated battery value with said second threshold voltage and generating said indication when said accumulated battery value is greater than said second threshold voltage; and power supply means for generating a regulated supply voltage level and coupled to said first comparator means, said second comparator means, said status storage means and said threshold generating means. - View Dependent Claims (31, 32, 33, 34, 35)
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36. A method for sensing a voltage source output voltage and producing dan indication when said voltage source output voltage signifies an abnormal condition, said method comprising:
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sensing said voltage source output voltage; comparing said voltage source output voltage with a first threshold voltage and generating a first output when said voltage source output voltage is less than said first threshold voltage; storing a preselected number of said first outputs and generating an accumulated value; comparing said accumulated value with a predetermined value and generating a second output; and producing said indication when said accumulated value is equal to or greater than said predetermined value.
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37. A method for sensing a depletable battery voltage and producing an indication when said depletable battery voltage signifies an abnormal condition, said method comprising:
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sensing said depletable battery voltage; comparing said depletable battery voltage with a first threshold voltage and generating a first output having a first state when said depletable battery voltage is less then said first threshold voltage and a second state when said depletable battery voltage is more than said first threshold voltage; periodically storing said first output; combined said stored output to generate an accumulated battery status voltage; and producing said indication when said accumulated battery status voltage is greater than a second threshold voltage. - View Dependent Claims (38, 39)
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Specification