Electronic battery tester
First Claim
1. An apparatus for monitoring the condition of a storage battery, comprising:
- battery test circuitry adapted to couple to the storage battery through a first Kelvin connection and second Kelvin connection;
first and second electrical leads coupled to a first terminal of the battery test circuitry and adapted to provide the first Kelvin connection to the battery;
third and fourth electrical leads coupled to a second terminal of the battery test circuitry and adapted to provide the second Kelvin connection to the battery; and
induction cancellation circuitry coupling the first electrical lead to the second electrical lead.
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Accused Products
Abstract
An apparatus for electronically testing or monitoring the condition of a storage battery is provided. The apparatus includes an inductance cancellation circuit for use in a Kelvin probe of an electronic battery tester. The induction cancellation circuit reduces inductive coupling between leads of the Kelvin probe. The apparatus also includes a DC coupled AC amplifier for amplifying an AC response signal of an electronic battery tester. Other aspects include a critically damped band-pass filter a response signal, a DC to DC convertor isolation circuit, operator editable test criteria, a battery temperature sensing element, an automatically adjustable gain stage and the use of an internal reference standard for a self calibration.
407 Citations
42 Claims
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1. An apparatus for monitoring the condition of a storage battery, comprising:
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battery test circuitry adapted to couple to the storage battery through a first Kelvin connection and second Kelvin connection;
first and second electrical leads coupled to a first terminal of the battery test circuitry and adapted to provide the first Kelvin connection to the battery;
third and fourth electrical leads coupled to a second terminal of the battery test circuitry and adapted to provide the second Kelvin connection to the battery; and
induction cancellation circuitry coupling the first electrical lead to the second electrical lead. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of reducing an inductively coupled current in a Kelvin probe of an electronic battery tester, comprising:
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coupling to a sense current carried on a first electrical lead of the Kelvin probe; and
supplying an opposed current in a second electrical lead of the Kelvin probe in response to the sense current, the opposed current flowing in opposition to an inductively coupled current in the second electrical lead. - View Dependent Claims (14, 15, 16)
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17. An apparatus for monitoring the condition of a storage battery, comprising:
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first and second Kelvin connections configured to couple to terminals of the battery;
an AC test signal source adapted to couple to the terminals of the battery through a first terminal of the first Kelvin connection and a first terminal of the second Kelvin connection and inject an AC test signal therethrough;
test circuitry adapted to provide battery condition information in response to a battery response signal; and
a DC coupled AC amplifier adapted to couple to the terminals of the battery through a second connection of the first Kelvin connection and a second connection of the second Kelvin connection and provide the battery response signal to the test circuitry as a function of an AC response signal arising in response to the AC test signal between the battery terminals, the battery response signal substantially independent of DC battery voltage. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. An apparatus for monitoring the condition of a storage battery, comprising:
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an AC test signal source adapted to couple to terminals of the battery and inject an AC test signal therethrough;
test circuitry adapted to provide battery condition information in response to a battery response signal; and
a critically damped band-pass filter adapted to couple to the terminals of the battery and provide the battery response signal to the test circuitry as a function of an AC response signal arising in response to the AC test signal between the battery terminals, the battery response signal substantially independent of DC battery voltage. - View Dependent Claims (35, 36, 37, 38)
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39. An apparatus for monitoring the condition of a storage battery, comprising:
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first and second Kelvin connections configured to couple to terminals of the battery;
an AC test signal source adapted to couple to the terminals of the battery through a first terminal of the first Kelvin connection and a first terminal of the second Kelvin connection and inject an AC test signal therethrough;
test circuitry adapted to provide battery condition information in response to a battery response signal; and
an adjustable gain stage adapted to couple to the terminals of the battery through a second connection of the first Kelvin connection and a second connection of the second Kelvin connection and provide the battery response signal to the test circuitry as a function of an AC response signal arising in response to the AC test signal between the battery terminals, the adjustable gain stage having a gain input and wherein the amplification gain of the adjustable gain stage is a function of the gain input. - View Dependent Claims (40, 41, 42)
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Specification