Method and apparatus for controlling thermal runaway in a battery backup system
First Claim
1. An apparatus for controlling thermal runaway in a telecommunications switching station backup battery recharging system receiving current from a power supply and delivering current through a rectifier to a battery and a load, the system having a low voltage disconnect-switch capable of interrupting current to the battery, the apparatus comprising:
- a. means for generating a first signal having a first value representative of the current flowing through the rectifier;
b. means for generating a second signal having a second value representative of the current flowing through the load;
c. means for calculating a third value, the third value being equal to the second value subtracted from the first value; and
d. means for generating a third signal indicative of thermal runaway when the third value exceeds a predetermined value for a predetermined period.
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Abstract
An energy management system comprising a method and an apparatus for controlling thermal runaway in a telecommunications switching station backup battery recharging system receiving current from a power supply and delivering current through a rectifier to a battery and a load, the system having a low voltage disconnect switch capable of interrupting current to the battery. A current shunt is provided for generating a first signal having a first value representative of the current flowing through the rectifier. A current shunt is provided for generating a second signal having a second value representative of the current flowing through the load. A microprocessor is provided for calculating a third value, the third value being equal to the second value subtracted from the first value. A microprocessor is also provided for generating a third signal indicative of thermal runaway when the third value exceeds a predetermined value. A switch for interrupting current to the battery when the third signal exceeds the predetermined value may also be provided.
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Citations
20 Claims
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1. An apparatus for controlling thermal runaway in a telecommunications switching station backup battery recharging system receiving current from a power supply and delivering current through a rectifier to a battery and a load, the system having a low voltage disconnect-switch capable of interrupting current to the battery, the apparatus comprising:
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a. means for generating a first signal having a first value representative of the current flowing through the rectifier; b. means for generating a second signal having a second value representative of the current flowing through the load; c. means for calculating a third value, the third value being equal to the second value subtracted from the first value; and d. means for generating a third signal indicative of thermal runaway when the third value exceeds a predetermined value for a predetermined period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for controlling thermal runaway in a telecommunications switching station backup battery recharging system receiving current from a power supply and delivering current through a rectifier to at a battery and a load, the system having a low voltage disconnect switch capable of interrupting current to the battery, the method comprising the steps of:
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a. generating a first signal having a first value representative of the current flowing through the rectifier; b. generating a second signal having a second value representative of the current flowing through the load; c. calculating a third value, the third value being equal to the second value subtracted from the first value; and d. generating a third signal indicative of thermal runaway when the third value exceeds a predetermined value for a predetermined period. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A series of operational steps to be performed on a computer used to control an apparatus for controlling thermal runaway in a telecommunications switching station backup battery recharging system receiving current from a power supply and delivering current through a rectifier to at a battery and a load, the system having a low voltage disconnect switch capable of interrupting current to the battery, comprising the operational steps of:
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a. receiving a first signal having a first value representative of the current flowing through the rectifier; b. receiving a second signal having a second value representative of the current flowing through the load; c. subtracting said second value from said first value, thereby creating a difference value; d. comparing the difference value to a preselected fourth value, said fourth preselected value indicating a minimum difference value corresponding to a thermal runaway condition; and e. generating a signal that indicates thermal runaway when the difference signal is at least equal to the fourth value for a predetermined period. - View Dependent Claims (18, 19, 20)
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Specification