Battery power display control method and battery power display control circuit

A technology for displaying control methods and battery power, applied in the direction of measuring electric variables, measuring electricity, measuring devices, etc., can solve the problem that the battery power control method is difficult to meet the cost and accuracy at the same time, to eliminate voltage drop, ensure normal operation, improve The effect of detection accuracy

CN105068016AActive Publication Date: 2015-11-18JOULWATT TECH ZHANGJIAGANG INC LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2015-11-18

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Abstract

The invention provides a battery power display control method and a battery power display control circuit. The control method comprises the steps of acquiring the working voltage under the condition of battery charge and discharge, acquiring the average charge and discharge current under the condition of battery charge and discharge, acquiring the voltage drop generated by the average charge and discharge current on a compensation resistor to form a compensation voltage, superposing the compensation voltage and the working voltage to obtain an open-circuit voltage representing the current battery power, comparing the open-circuit voltage with at least two preset voltage benchmarks to obtain the current level of battery power and form a display signal, and displaying the current level of battery power according to the display signal.
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Description

technical field

[0001] The invention relates to the field of battery power detection, and in particular to a battery power display control method and a control circuit. Background technique

[0002] At present, with the rapid development of electrical equipment, users not only put forward high requirements for the function, reliability and operability of the equipment. For electrical equipment containing batteries, in order to ensure the reliable operation of the equipment, users need to know the battery usage time accurately, charge or replace the batteries in time, so the accurate display of the current battery power will become the design index that users focus on.

[0003] At present, the display control of the battery power is mainly realized through the following two methods. The first one is realized by a separate MCU. This display control method requires more peripheral components, which not only requires high design cost but also occupies a large volume. In order ...

Examples

Embodiment Construction

[0029] In actual use, it is the open circuit voltage V of the battery that can accurately characterize the current battery capacity Q BAT(OCV) , open circuit voltage V BAT(OCV) There is a one-to-one correspondence relationship with the battery power Q, and the relationship between the two can be obtained through actual measurement. However, when the battery is in working condition, due to the internal resistance Rs of the battery, the open circuit voltage V of the battery BAT(OCV) It cannot be obtained directly, what can be directly obtained is the working voltage V of the battery BAT . image 3 Among them, Rs represents the equivalent internal resistance of the battery, not the actual external resistance. By analyzing the charging and discharging state of the battery, it can be known that when the battery is in the charging state, the working voltage V BAT equal to the open circuit voltage V BAT(OCV) and the sum of the voltage drop Vs generated on the internal resistance...