Electronic battery condition tester
First Claim
1. A battery condition tester for a battery having positive and negative terminals, said battery condition tester comprising:
- means comprising a circuit for providing a constant current load between said terminals, and means for periodically switching said constant current, on and off, and means comprising a separate detection circuit including;
first amplifier means coupled to said positive and negative terminals to amplify the AC battery voltage resulting from the switched battery current;
rectifier means for providing a DC voltage derived from said AC component of switched battery voltage;
integrator circuit means for providing an output signal inversely proportional to the value of said DC voltage. indicator means responsive to said output signal.
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Accused Products
Abstract
An electronic tester is disclosed that monitors the current capability of a storage battery without drawing heavy currents. It determines current capability from measurement of the battery'"'"'s internal resistance. Internal resistance is monitored in the conventional manner by drawing a small current load and observing the A.C. voltage generated at the battery terminals. The load circuitry used here ensures that the current drawn is independent of battery resistance. The resistance signal is processed with a novel application of integrator circuitry to derive the battery'"'"'s current capability.
10 Citations
9 Claims
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1. A battery condition tester for a battery having positive and negative terminals, said battery condition tester comprising:
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means comprising a circuit for providing a constant current load between said terminals, and means for periodically switching said constant current, on and off, and means comprising a separate detection circuit including;
first amplifier means coupled to said positive and negative terminals to amplify the AC battery voltage resulting from the switched battery current;
rectifier means for providing a DC voltage derived from said AC component of switched battery voltage;
integrator circuit means for providing an output signal inversely proportional to the value of said DC voltage. indicator means responsive to said output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification