Battery charging, monitoring and alarm circuit
First Claim
1. A circuit for monitoring a battery to predict a degraded battery capacity with the battery electrically connected in a standby power operating system, the circuit comprising:
- charging means for periodically providing a charging current pulse to the monitored battery;
first means for identifying a fully charged battery condition;
means responsive to said first means for detecting a dynamic impedance characteristic of the monitored battery, said dynamic impedance detecting means including;
means responsive to said charging current pulse for detecting a peak voltage across the monitored battery,means responsive to said charging current pulse for detecting peak current through the monitored battery, andratio comparator means for comparing said detected peak voltage with said detected peak current to identify said dynamic impedance characteristic;
means for comparing said identified dynamic impedance characteristic with a predefined value; and
means responsive to said comparator means for generating an alarm signal.
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Accused Products
Abstract
Methods and circuits are provided for monitoring a battery with the monitored battery electrically connected in an operating system. A dynamic impedance characteristic of the monitored battery is identified and compared with a predefined value. An alarm signal is generated responsive to the compared values to predict a degraded battery capacity. A leakage current value through the monitored battery is detected. An alarm signal is generated responsive to the detected leakage current value to predict a short life expectancy for the monitored battery. Visual and audible alarms are generated responsive to either of the generated alarm signals after the monitored battery has been fully charged. An alarm signal is immediately generated responsive to a detected charging current value above a predetermined value.
47 Citations
8 Claims
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1. A circuit for monitoring a battery to predict a degraded battery capacity with the battery electrically connected in a standby power operating system, the circuit comprising:
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charging means for periodically providing a charging current pulse to the monitored battery; first means for identifying a fully charged battery condition; means responsive to said first means for detecting a dynamic impedance characteristic of the monitored battery, said dynamic impedance detecting means including; means responsive to said charging current pulse for detecting a peak voltage across the monitored battery, means responsive to said charging current pulse for detecting peak current through the monitored battery, and ratio comparator means for comparing said detected peak voltage with said detected peak current to identify said dynamic impedance characteristic; means for comparing said identified dynamic impedance characteristic with a predefined value; and means responsive to said comparator means for generating an alarm signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A circuit for monitoring a battery to predict a degraded battery capacity and to predict a short life expectancy for the battery with the battery electrically connected in a standby power operating system, the circuit comprising:
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means for identifying a fully charged battery condition; means for detecting current through the monitored battery; comparator means for comparing said detected current with a plurality of predetermined values to identify a leakage current value; means for detecting a dynamic impedance characteristic of the monitored battery, said means for detecting a dynamic impedance characteristic of the monitored battery including charging means for providing a charging current pulse to the monitored battery, means responsive to said charging current pulse for detecting a peak voltage across the monitored battery;
means responsive to said charging current pulse for detecting peak current through the monitored battery, and ratio comparator means for comparing said detected peak voltage with said detected peak current to identify said dynamic impedance characteristic;means for comparing said identified dynamic impedance characteristic with a predefined value; and means responsive to said identified fully charged battery condition for generating an alarm signal responsive to said compared dynamic impedance characteristic and said detected leakage current value.
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Specification