Battery tester
First Claim
1. A battery tester comprising:
- an AC constant-current generator for applying an AC current for measurement to a battery under test,internal resistance detecting means having wave detection means connected to the AC constant-current generator and being adapted to be disposed between terminals of the battery, said internal resistance detecting means detecting a voltage proportional to an internal resistance of said battery in synchronism to a phase of the AC current when said AC current is applied thereto,voltage detecting means adapted to be connected to the battery for detecting a DC terminal voltage of said battery, anddeterioration judging means connected to the internal resistance detecting means and said voltage detecting means, said deterioration judging means judging deterioration of said battery from said internal resistance detected by said internal resistance detecting means and said DC terminal voltage detected by said voltage detecting means.
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Accused Products
Abstract
A battery tester is formed at an AC constant-current generator for applying an AC current for measurement to a battery BT under test via a coupling capacitor, an internal resistance detecting device for detecting the internal resistance of the battery BT according to a voltage signal therefrom when the AC current is applied, a voltage detecting device for detecting the terminal voltage across the battery, and a deterioration judging unit for judging the deterioration of the battery from the internal resistance and terminal voltage detected by the internal resistance detecting device and the voltage detecting device. The internal resistance and terminal voltage of the battery are measured simultaneously, and deterioration of the battery is judged from the measurement data.
267 Citations
16 Claims
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1. A battery tester comprising:
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an AC constant-current generator for applying an AC current for measurement to a battery under test, internal resistance detecting means having wave detection means connected to the AC constant-current generator and being adapted to be disposed between terminals of the battery, said internal resistance detecting means detecting a voltage proportional to an internal resistance of said battery in synchronism to a phase of the AC current when said AC current is applied thereto, voltage detecting means adapted to be connected to the battery for detecting a DC terminal voltage of said battery, and deterioration judging means connected to the internal resistance detecting means and said voltage detecting means, said deterioration judging means judging deterioration of said battery from said internal resistance detected by said internal resistance detecting means and said DC terminal voltage detected by said voltage detecting means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A battery tester comprising:
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an AC constant-current generator for applying an AC current for measurement to a battery under test, internal resistance detecting means adapted to be connected to the battery for detecting an internal resistance of said battery according to an AC voltage signal generated from said battery when said AC current is applied thereto, voltage detecting means adapted to be connected to the battery for detecting a DC terminal voltage of said battery, and deterioration judging means connected to the internal resistance detecting means and said voltage detecting means, said deterioration judging means judging deterioration of said battery from said internal resistance detected by said internal resistance detecting means and said DC terminal voltage detected by said voltage detecting means, said deterioration judging means including an A/D converter for converting detection signals obtained from said internal resistance detecting means and said voltage detecting means into digital data;
a data memory for storing said digital data;
a control memory, in which threshold resistance data and threshold voltage data for judging the deterioration of said battery are stored; and
control means for writing a measured value of said internal resistance of said battery and a measured value of said DC terminal voltage in said data memory and judging the deterioration of said battery by comparing said measured internal resistance value with said threshold resistance data and comparing said measured DC terminal voltage value with said threshold voltage data,wherein denoting threshold values of said internal resistance by α and
β
(α
<
β
), a threshold value of said terminal voltage by γ
, said measured internal resistance value by R, and said measured terminal voltage value by V, said control means judges;(1) "pass" when R≦
α and
V>
γ
;(2) "warning" when R≦
α and
V≦
γ
or when α
<
R≦
β and
V>
γ
or when α
<
R≦
β and
V≦
γ
; and(3) "fail" when R>
β and
V>
γ
or when R>
β and
V≦
γ
. - View Dependent Claims (11)
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12. A battery tester comprising:
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an AC constant-current generator for applying an AC current for measurement to a battery under test, internal resistance detecting means adapted to be connected to the battery for detecting an internal resistance of said battery according to an AC voltage signal generated from said battery when said AC current is applied thereto, voltage detecting means adapted to be connected to the battery for detecting a DC terminal voltage of said battery, deterioration judging means connected to the internal resistance detecting means and said voltage detecting means, said deterioration judging means judging deterioration of said battery from said internal resistance detected by said internal resistance detecting means and said DC terminal voltage detected by said voltage detecting means, said deterioration judging means including an A/D converter for converting detection signals obtained from said internal resistance detecting means and said voltage detecting means into digital data;
a data memory for storing said digital data;
a control memory, in which threshold resistance data and threshold voltage data for judging the deterioration of said battery are stored; and
control means for writing a measured value of said internal resistance of said battery and a measured value of said DC terminal voltage in said data memory and judging the deterioration of said battery by comparing said measured internal resistance value with said threshold resistance data and comparing said measured DC terminal voltage value with said threshold voltage data, andoperating means connected to the control means for providing various instruction signals to the control means, range setting information with respect to analog measurement means including the internal resistance detecting means and the voltage detecting means being written for each threshold data in the control memory, a range of the analog measurement means being switched whenever said threshold data is updated by the operating means.
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13. A battery tester comprising:
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internal resistance measuring means for measuring an internal resistance of a battery under test including an AC constant-current generator for providing an AC current for measurement to the battery;
AC voltage detecting means adapted to be connected to the battery for detecting an AC voltage generated between terminals of the battery;
converting means attached to the AC voltage detecting means for converting detected AC voltage into a resistance value;
an amplifier connected to the AC constant-current generator for amplifying an AC voltage from the AC constant-current generator to a constant level; and
a resistor provided in a current path leading from an output side of the amplifier to the battery for setting the AC current for measurement to a predetermined level,a breaking detection circuit for comparing an output voltage from said AC constant-current generator with a predetermined reference voltage, and checking whether the current path between said AC constant-current generator and said battery is open or closed based on whether said reference voltage is exceeded, said breaking detection circuit including a rectifying and smoothing circuit for converting the amplified voltage from said amplifier into a DC voltage;
a voltage comparator connected to the rectifying and smoothing circuit for comparing said DC voltage from said rectifying and smoothing circuit with a predetermined threshold voltage; and
a logic signal generator connected to the voltage comparator for converting an output of said voltage comparator into a logic signal of logic level "L" or "HH" and outputting said logic signal, andmeasuring means connected to the logic signal generator for receiving the logic signal, said measuring means judging if the current path leading from said AC constant-current generator to said battery is broken or not when said logic signal is in a predetermined level state. - View Dependent Claims (14, 15, 16)
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Specification