Electronic battery tester with tailored compensation for low state-of charge
DC CAFCFirst Claim
1. An electronic device for monitoring or testing a battery having one of a plurality of battery types associated therewith, comprising:
- input circuitry for receiving information related to the type of the battery;
dynamic battery parameter determining circuitry for determining an intermediate dynamic parameter of the battery;
open circuit voltage sense circuitry coupled to the battery for sensing an open circuit voltage of the battery;
correction circuitry coupled to the dynamic battery parameter determining circuitry, to the open circuit voltage sense circuitry and to the input circuitry which adjusts the determined intermediate dynamic parameter based upon the battery type information and upon a value of the open circuit voltage of the battery;
output circuitry coupled to the correction circuitry for providing test results indicative of the condition of the battery, wherein the test results are provided as a function of the adjusted intermediate parameter.
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Abstract
Various embodiments of an improved electronic device for testing or monitoring storage batteries that may be only partially charged are disclosed. The device determines the battery'"'"'s small-signal dynamic conductance in order to provide either a proportional numerical readout, displayed in appropriate battery measuring units, or a corresponding qualitative assessment of the battery'"'"'s relative condition based upon its dynamic conductance and electrical rating. The device also determines the battery'"'"'s terminal voltage in an essentially unloaded condition and utilizes this information to automatically correct the measured dynamic conductance. The automatic correction is performed by the electronic device using information or functions which are tailored for the particular type of battery being tested. By virtue of this automatic correction, the quantitative or qualitative information displayed to the user conforms with that of a fully-charged battery even though the battery may, in actual fact, be only partially charged. If the battery'"'"'s state-of-charge is too low for an accurate assessment to be made, no information is displayed. Instead, an indication is made to the user that the battery must be recharged before testing.
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Citations
12 Claims
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1. An electronic device for monitoring or testing a battery having one of a plurality of battery types associated therewith, comprising:
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input circuitry for receiving information related to the type of the battery; dynamic battery parameter determining circuitry for determining an intermediate dynamic parameter of the battery; open circuit voltage sense circuitry coupled to the battery for sensing an open circuit voltage of the battery; correction circuitry coupled to the dynamic battery parameter determining circuitry, to the open circuit voltage sense circuitry and to the input circuitry which adjusts the determined intermediate dynamic parameter based upon the battery type information and upon a value of the open circuit voltage of the battery; output circuitry coupled to the correction circuitry for providing test results indicative of the condition of the battery, wherein the test results are provided as a function of the adjusted intermediate parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification