BATTERY PROTECTION CIRCUIT
First Claim
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1. A circuit comprising:
- a monitoring circuit operable for monitoring a cell and generating a monitoring signal indicating a cell voltage of said cell;
an integrator circuit coupled to said monitoring circuit and operable for receiving said monitoring signal and a first predetermined threshold and for accumulating a difference between said monitoring signal and said first predetermined threshold over a time period to generate an integrating output; and
a comparator coupled to said integrator circuit and operable for comparing said integrating output to a second predetermined threshold, and for generating a control signal.
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Abstract
A battery circuit includes a monitoring circuit, an integrator circuit, and a comparator. The monitoring circuit can be used to monitor a cell and generate a monitoring signal indicating a cell voltage of the cell. The integrator circuit accumulates a difference between the monitoring signal and a first predetermined threshold over a time period to generate an integrating output. The comparator compares the integrating output to a second predetermined threshold and generates a control signal.
63 Citations
18 Claims
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1. A circuit comprising:
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a monitoring circuit operable for monitoring a cell and generating a monitoring signal indicating a cell voltage of said cell; an integrator circuit coupled to said monitoring circuit and operable for receiving said monitoring signal and a first predetermined threshold and for accumulating a difference between said monitoring signal and said first predetermined threshold over a time period to generate an integrating output; and a comparator coupled to said integrator circuit and operable for comparing said integrating output to a second predetermined threshold, and for generating a control signal. - View Dependent Claims (2, 3, 4, 5)
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6. A method comprising:
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monitoring a plurality of cell voltages; accumulating a difference between a monitoring signal indicating a cell voltage and a first predetermined threshold over a time period for generating an integrating output; and generating a control signal according to a comparison of said integrating output and a second predetermined threshold. - View Dependent Claims (7, 8, 9, 10)
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11. A battery pack comprising:
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a plurality of cells; a switch coupled in series with said cells; and a battery protection circuit coupled to said cells and operable for accumulating a difference between a first signal indicating a cell voltage and a predetermined over voltage threshold over a time period to generate an integrating output and for generating a control signal according to a comparison of said integrating output and a second predetermined threshold, wherein said switch is switched off in response to said control signal to protect said battery pack from an over voltage transient condition if said integrating output exceeds said second predetermined threshold. - View Dependent Claims (12, 13, 14)
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15. A method for protecting a battery, said method comprising:
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monitoring a cell voltage of a cell in said battery; comparing said cell voltage to a first predetermined threshold and a second predetermined threshold; comparing a first time duration when said cell voltage exceeds said first predetermined threshold to a first predetermined time period if said cell voltage exceeds said first predetermined threshold; detecting a first undesired condition if said first time duration exceeds said first predetermined time period; comparing a second time duration when said cell voltage exceeds said second predetermined threshold to a second predetermined time period if said cell voltage exceeds said second predetermined threshold; detecting a second undesired condition if said second time duration exceeds said second predetermined time period, wherein said first predetermined threshold is greater than said second predetermined threshold, and wherein said first predetermined time period is less than said second predetermined time period. - View Dependent Claims (16, 17, 18)
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Specification