Electronic battery tester
First Claim
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1. An electronic battery tester for determining condition of a storage battery, comprising:
- a four-point Kelvin connection adapted to electrically couple to terminals of the battery;
a forcing function having a forcing function output with a time varying component, the forcing function output coupled to a first pair of connections of the Kelvin connection;
a dynamic response sensor coupled to a second pair of connections of the Kelvin connection configured to provide a sense output relating to a time varying response of the battery to the forcing function;
digital circuitry coupled to the forcing function and the dynamic response sensor configured to determine condition of the storage battery as a function of a first dynamic parameter and a second dynamic parameter, the first and second dynamic parameters selected from the group of dynamic parameters consisting of conductance, impedance, resistance, admittance and their combination, the first dynamic parameter different than the second.
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Abstract
An electronic battery tester for determining a condition of a storage battery includes a forcing function adapted to couple to the battery. Circuitry coupled to the forcing function is adapted to obtain measurements from the battery at multiple levels of the forcing function. In the method according to the present invention, a forcing function is applied to the battery at a first level and a first measurement is obtained. The forcing function is applied at a second level and a second measurement is obtained. The first and second measurements are correlated to condition of the battery.
425 Citations
17 Claims
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1. An electronic battery tester for determining condition of a storage battery, comprising:
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a four-point Kelvin connection adapted to electrically couple to terminals of the battery;
a forcing function having a forcing function output with a time varying component, the forcing function output coupled to a first pair of connections of the Kelvin connection;
a dynamic response sensor coupled to a second pair of connections of the Kelvin connection configured to provide a sense output relating to a time varying response of the battery to the forcing function;
digital circuitry coupled to the forcing function and the dynamic response sensor configured to determine condition of the storage battery as a function of a first dynamic parameter and a second dynamic parameter, the first and second dynamic parameters selected from the group of dynamic parameters consisting of conductance, impedance, resistance, admittance and their combination, the first dynamic parameter different than the second. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of testing a battery, comprising:
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applying a forcing function having a time varying component through a first pair of connections of a Kelvin connection;
obtaining a first and a second dynamic response measurement through a second pair of connections of the Kelvin connection related to a response of the battery to the applied forcing function;
calculating a first dynamic parameter of the battery selected from the group consisting of conductance, impedance, resistance, admittance and their combination;
calculating a second dynamic parameter of the battery selected from the group consisting of conductance, impedance, resistance, admittance and their combination, wherein the first dynamic parameter is different than the second dynamic parameter; and
correlating the first and second dynamic paramenters to condition of the battery. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification