KR910003390A - Low battery detection method and system - Google Patents

Abstract

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Description

Low battery detection method and system

Since this is an open matter, no full text was included.

1 is a graph showing a cell voltage characteristic curve when currents emitted from a battery are 200 mA, 400 mA, and 600 mA, respectively.

2 is a graph showing battery voltage characteristic curves for 1 hour, 2 hours, 4 hours and 8 hours of charging time, respectively;

3 is a block diagram of a low battery detection system of the present invention.

Claims (12)

A low battery detection method comprising: (a) reading a current emitted from a battery; (b) in step (a), obtaining a reference voltage for low battery detection from the read current; (c) reading the voltage of the battery; (d) obtaining a voltage change amount from the battery voltage read last time and the battery voltage read this time; (e) correcting the reference voltage for detecting the low battery in response to the voltage change amount; (f) comparing the corrected low battery detection reference voltage with the voltage read in step (c) to determine the low battery when the voltage read in step (c) is lower than the low battery detection reference voltage. A low battery detection method comprising the. The method of claim 1, wherein the step (b) comprises obtaining a reference voltage for detecting a battery according to a battery voltage characteristic curve corresponding to a different current value. The method of claim 1, wherein the step (e) comprises correcting the reference voltage for detecting the battery according to a battery voltage characteristic curve obtained corresponding to a different charging time. The method of claim 3, wherein the correcting includes correcting the time until the device driven by the battery stops normal operation after determining that the battery is a low battery to be uniform for different charging times. Low battery detection method. First table memory means for storing a correspondence between the current emitted from the battery and the reference voltage for low battery detection; Second table memory means for storing a correspondence between a change amount of the battery voltage and a reference voltage correction device for detecting a low battery; Means for measuring a current emitted from the battery; Means for referring to the first table memory means according to the measured current and obtaining a reference voltage for low battery detection; Means for measuring a battery voltage; Means for obtaining a voltage change amount from the measured battery voltage and the last measured battery voltage; Means for correcting a reference voltage for low battery detection with reference to said second table memory means in accordance with the obtained amount of voltage change; And means for determining a low battery of said battery using the corrected low battery reference voltage for detection. 6. The low battery detection system according to claim 5, wherein the means for obtaining the low battery detection reference voltage includes means for obtaining a low battery detection reference voltage according to a battery voltage characteristic curve corresponding to a different current value. 6. The low battery according to claim 5, wherein the means for correcting the low battery detection reference voltage includes means for correcting the low battery detection reference voltage according to a battery voltage characteristic curve obtained corresponding to a different charging time. Detection system. 8. The method of claim 7, wherein the means for calibrating comprises means for calibrating the time until the device driven by the battery ceases normal operation after determining that the battery is a low battery is uniform for different charging times. Low battery detection system. Means for measuring the discharge current of the battery; Means for obtaining a reference voltage for low battery detection from the measured current; Means for measuring a battery voltage; Means for obtaining a voltage change amount from the measured voltage and the last measured voltage; Means for correcting a reference voltage for low battery detection in accordance with the amount of voltage change; Means for comparing a calibrated low battery detection reference voltage with a measured battery voltage; And a means for determining that the battery is a low battery when the measured battery voltage is lower than the corrected reference value for detecting the low battery. 10. The low battery detection system according to claim 9, wherein the means for obtaining the low battery detection reference voltage includes a means for obtaining a low battery detection reference voltage according to a battery voltage characteristic curve corresponding to a different current value. The low battery according to claim 9, wherein the means for correcting the reference voltage for detecting the low battery includes means for correcting the reference voltage for detecting the low battery in accordance with the battery voltage characteristic collinearity obtained corresponding to a different charging time. Detection system. 10. The apparatus of claim 9, wherein the means for calibrating comprises means for calibrating the time until the device driven by the battery ceases normal operation after determining that the battery is a low battery is uniform for different charging times. Low battery detection system. ※ Note: The disclosure is based on the initial application.