Importance

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Abstract

An electronic device for effectively preventing time-varying current from passing through an electro-chemical cell or battery is disclosed. Time-varying current flowing in a circuit which includes the cell/battery is sensed externally to the cell/battery with a magnetically-coupled ac current probe thereby producing an induced time-varying signal. This induced signal is amplified to the level of the original time-varying current and applied to the cell/battery's terminals in phase-opposition to the original current. As a result, the component of time-varying current flowing in the cell/battery's external leads assumes an alternate path around the cell/battery and is effectively canceled within the cell/battery itself. Time-varying voltage across the cell/battery, which would normally result from time-varying current passing through its internal impedance, is likewise eliminated. Accordingly, measurements of the cell/battery's incremental parameters can be performed with the cell/battery 'on line' without measurement errors due to spurious charger-and load-related signals. Additional applications of the disclosed device include reducing or eliminating ripple and crosstalk in batteries that are supplying voltage-sensitive equipment, and preventing plate deterioration caused by ac currents flowing through a cell/battery.

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First Claim