JPH11185829A - Remaining battery capacity display device and its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a remaining battery capacity indication device that makes its remaining capacity indication to be unchanged even if the battery voltage changes significantly in an operating condition to consume large current by compensating a threshold according to an operating condition when it is used. SOLUTION: This remaining battery capacity indication device is composed of: a battery 1 represented by a rechargeable battery such as a lithium ion battery and the like; a voltage read means 2 to read the analog voltage value of the battery; an analog-digital converting means 3 to convert the read battery voltage into a digital value; a threshold storing means 4 in which each threshold value (digital value) for large, middle and small battery capacities is stored beforehand; a compensating value storing means 5 to compensate the threshold value according to an operating condition; a data comparing means 6 to compare the read voltage with the voltage threshold: and an display means 7 such as LCD or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery remaining capacity display device for displaying a battery remaining capacity on a device using a battery typified by a PHS phone or the like, and in particular, a battery voltage value largely fluctuates depending on an operation state. Even if the display of the remaining battery capacity does not fluctuate significantly, the configuration is such.

[0002]

2. Description of the Related Art A conventional example will be described with reference to the drawings. FIG.
Is a schematic block diagram of a battery remaining capacity display device in a conventional example, FIG. 12 is a display example of a battery remaining capacity of a terminal device typified by a PHS phone or the like, and FIG. 13 is an operation flowchart.

Conventionally, this type of battery remaining capacity display device includes a battery 10 typified by a lithium ion battery or the like, a voltage reading means 11 for reading an analog voltage value of the battery, and a digital value for reading the battery voltage (analog value). A / D conversion means 12 for converting the battery capacity into "large", "medium" and "small" threshold values (digital value), threshold value storage means 13 in advance, and read voltage value and voltage It comprises a data comparing means 14 for comparing threshold values and a display means 15 such as an LCD.

The operation is performed by voltage reading means 11
Reads the voltage value of the battery 10 (step 100), and converts the read battery voltage (analog value) into a digital value by the AD converter 12 (step 101). The converted value is compared with the "large" threshold value of the battery voltage stored in the threshold value storage means 13 in advance by the data comparison means 14 (step 102), and if it is larger than the threshold value (Y in step 102). ), The "large" mark is displayed on the display means 15 (step 103). Similarly, if the threshold is larger than "medium" (Y in step 104), a "medium" mark is displayed on the display means 15 (step 105), and if larger than the threshold "small" (Y in step 106), the display is made. The "small" mark is displayed on the means 15 (step 107). If the threshold value is smaller than "small", an "empty" mark is displayed (step 108).

[0005]

However, in the above-mentioned conventional example, since the value of the read remaining battery voltage value is compared with the threshold value, in the battery driving device having an operation mode consuming a large current, The battery voltage value greatly varies depending on the operation state. For this reason, there is a problem that the display of the remaining battery capacity indicates “small” in an operation state in which a large current is consumed even with the same remaining battery capacity, and indicates “large” when the operation state ends. In a device that has various operation states and consumes significantly different currents, the battery voltage value fluctuates variously depending on the combination of operations. Therefore, there is a problem that the remaining battery capacity display indicates "small" or "large" depending on the combination of operations even at the same battery capacity. In a battery that has deteriorated due to long-term use, there is a problem that a threshold value initially stored is shifted due to aging, and a correct remaining battery capacity is not displayed.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, the present invention provides a battery typified by a lithium-ion battery or the like, a voltage reading means for reading an analog voltage value of the battery, and a read battery voltage. To A / D conversion means for converting into a digital value, threshold value storage means for storing in advance the threshold values (digital values) of “large”, “medium”, and “small” of the battery capacity, and a threshold depending on the operation state A correction value storage means for correcting the value, a data comparison means for comparing the read voltage value with the voltage threshold value, and a display means such as an LCD are provided, and the battery voltage value greatly fluctuates in an operation state consuming a large current. Even so, the display of the remaining battery capacity does not significantly fluctuate.

Further, the present invention provides various operations in addition to the above-described battery, voltage reading means, AD conversion means, threshold value storage means, correction value storage means, data comparison means, and display means. A correction table capable of changing a correction value corresponding to a state is provided so that the display of the remaining battery capacity does not change even if the battery voltage value changes variously depending on various operation states.

Further, the present invention provides a battery, a voltage reading means, an A / D converter, a threshold storage means, a data comparing means, a display means and a battery capable of coping with aging of the battery. A threshold value learning means for learning to a threshold value is provided so that a correct display of the remaining battery capacity can be performed even with a deteriorated battery.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a battery typified by a lithium ion battery or the like, voltage reading means for reading an analog voltage value of the battery, and converting the read battery voltage to a digital value. AD conversion means for converting,
Threshold value storage means in which threshold values (digital values) of the battery capacity "large", "medium", and "small" are stored in advance, and correction value storage means for correcting the threshold value according to an operation state; A battery remaining capacity display device comprising a data comparing means for comparing a read voltage value with a voltage threshold value and a display means such as an LCD, wherein the battery capacity is "large", "medium" , And "small" are corrected according to the operating state, so that even when the battery voltage value largely changes in the operating state consuming a large current, the display of the remaining battery capacity does not greatly change.

According to a second aspect of the present invention, there is provided the battery remaining capacity display device according to the first aspect, further comprising a correction table capable of changing correction values corresponding to various operation states. Since the battery capacity threshold value is corrected by referring to the correction table corresponding to each of the various operation states, even if the battery voltage value varies in various operation states, the remaining battery capacity display does not vary. It has the action of:

The invention according to claim 3 further comprises a threshold value learning means for learning a threshold value corresponding to aging of the battery. This is a remaining capacity display device. Since the battery capacity threshold value is re-learned to a threshold value corresponding to the aging of the battery, it has an effect that correct battery remaining capacity display can be performed even for a deteriorated battery.

Further, according to the present invention, the step of reading the analog voltage value of the rechargeable battery, the step of converting the read battery voltage to a digital value, the steps of “high”, “medium”, A step of correcting the threshold value stored in the storage means in advance in accordance with each of “small” according to the operation state, and a threshold value corrected based on the voltage value read as described above and the operation state. And a step of displaying the result of comparison. The battery remaining capacity display method is characterized in that the threshold values of the battery capacity are "large", "medium", and "small". Is corrected according to the operating state, so that even when the battery voltage value largely fluctuates in the operating state where a large current is consumed, the display of the remaining battery capacity does not greatly fluctuate.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First Embodiment) FIG. 1 shows a schematic block diagram of a battery remaining capacity display device according to a first embodiment of the present invention, and FIG. 2 shows an operation flowchart thereof. is there.

In FIG. 1, the battery remaining capacity display device according to the first embodiment includes a battery 1 typified by a rechargeable battery such as a lithium ion battery, voltage reading means 2 for reading an analog voltage value of the battery, AD conversion means 3 for converting the read battery voltage (analog value) into a digital value;
Threshold value storage means 4 in which threshold values (digital values) of the battery capacity "large", "medium", and "small" are stored in advance, and correction value storage means 5 for correcting the threshold value according to the operation state. And a data comparing means 6 for comparing a read voltage value with a voltage threshold value, and a display means 7 such as an LCD.

The operation of the battery remaining capacity display device according to the first embodiment configured as described above will be described below with reference to FIGS.

The voltage reading means 2 reads the voltage value of the battery 1 (step 10), and converts the voltage value into a digital value by the AD conversion means 3 (step 11). On the other hand, the battery voltage threshold, which is another factor for recognizing the remaining battery capacity, is corrected depending on the operation state. For example,
There are two operation modes. One is a mode that consumes almost no current like a telephone standby state (hereinafter, referred to as a small current mode), and the other is a mode in which a backlight is turned on during operation and a large current flows (hereinafter, a small current mode). Large current mode)
There is It is determined whether or not the current mode is the large current mode (step 12).
N), the threshold value is not corrected (step 13), and a constant correction is performed using the correction value storage means 5 in the large current mode (Y in step 12). The correction method can be selected from “large”, “medium”,
Correction value storage means 5 for each threshold value of "small"
Is subtracted, and the resulting value is used as a new threshold (corrected threshold) (step 14).

Then, the battery voltage read value (digital value) converted in step 11 is compared with the new threshold value "large" by the data comparing means 6 (step 15), and if it is larger than the threshold value (Y in step 15). ), The "large" mark is displayed on the display means 7 (step 16) Similarly, if the new threshold value is larger than "medium" (Y in step 17), the display means 7 is displayed.
Is displayed (step 18), and if it is larger than the new threshold value "small" (Y in step 19), the display means 7
Is displayed with a "small" mark (step 20). If the new threshold value is smaller than "small", an "empty" mark is displayed (step 21).

As described above, according to the first embodiment of the present invention, the respective threshold values of the battery capacity "large", "medium" and "small" are corrected according to the operating state at the time of use. In the operation state where a large current is consumed, even if the battery voltage value greatly fluctuates, the effect that the display of the remaining battery capacity does not fluctuate greatly can be obtained.

(Second Embodiment) FIG. 3 shows a schematic block diagram of a battery remaining capacity display device according to a second embodiment of the present invention. FIG. 4 shows the total current value in each operation mode. FIG. 5 shows a correction table, and FIG. 6 shows an operation flowchart.

In FIG. 3, the configuration is the same as that of the first embodiment shown in FIG. 1, except that a correction table 8 for converting a correction value for a current consumption which varies variously according to each operation mode is provided. is there.

The operation of the battery remaining capacity display device according to the second embodiment configured as described above will now be described with reference to FIG.
This will be described with reference to FIGS.

The voltage reading means 2 reads the voltage value of the battery 1 (step 30), and converts the voltage value into a digital value by the AD conversion means 3 (step 31). On the other hand, the battery voltage threshold value, which is another factor for recognizing the remaining battery capacity, is corrected according to each operation state. For example, it is assumed that the operation states are “standby mode”, “talk mode”, “key input mode”, and “data communication mode” as shown in FIG. Further, for each of these modes, a mode of whether the backlight is on or off is added. That is, the current consumption varies in various ways depending on the combination of operation modes, and the battery voltage varies even with the same remaining battery capacity.

In order to cope with this, it is necessary to grasp the operating current of each operation mode and change the correction value suitable for the current. Hereinafter, the operation of the present embodiment will be further described. First, the current operation mode is determined (step 32). Next, a total operation current is calculated using an operation mode matrix as shown in FIG. 4 (step 33). The correction value for the total operating current is converted by the correction table 8 and stored in the correction value storage means 5 (step 34). In the subsequent correction method, in the same manner as in the first embodiment, the threshold values of “large”, “medium” and “small” stored in the threshold value storage means 4 are determined in step 34. The corrected value is subtracted, and the resulting value is used as a new threshold value (corrected threshold value) (step 35).

Then, the read value (digital value) of the battery voltage converted in step 31 is compared with the new threshold value "large" by the data comparing means 6 (step 36), and if it is larger than the threshold value (step 36). (Y), the "large" mark is displayed on the display means 7 (step 37). Similarly, if it is larger than the new threshold "medium" (Y in step 38), a "medium" mark is displayed on the display means 7 (step 39). If it is larger than the new threshold "small" (Y in step 40), A "small" mark is displayed on the display means 7 (step 41). If the new threshold value is smaller than "small", an "empty" mark is displayed (step 42).

As described above, according to the second embodiment of the present invention, the battery capacity threshold value is corrected by referring to the correction table suitable for each of the various operating states. Even if the value fluctuates variously, the effect that the display of the remaining battery capacity does not fluctuate is obtained.

(Third Embodiment) FIG. 7 shows a schematic block diagram of a battery remaining capacity display device according to a third embodiment of the present invention. FIG. 8 shows a threshold learning table. 9 and 10 show operation flowcharts.

In FIG. 7, the configuration is the same as that of the first embodiment shown in FIG. 1 except that a threshold voltage learning means 9 for re-learning the battery voltage threshold value according to the aging of the battery is provided. It is.

The operation of the battery remaining capacity display device of the third embodiment configured as described above will now be described with reference to FIG.
This will be described with reference to FIGS. 8, 9 and 10.

First, a learning method for battery aging will be described. When the same current is consumed by a battery that has not deteriorated and a battery that has deteriorated, the voltage drop value differs (the voltage drop is large in a battery that has deteriorated). This is because the internal resistance of the battery increases when the battery deteriorates. In this embodiment, the characteristics of this battery are used. When the capacity state of the battery 1 is under the same condition (for example, at the moment when the battery is fully charged), the battery voltage value is read by the voltage reading means 2 in each of the small current mode (standby mode) and the large current mode. Is read (steps 50 and 52) and AD
The conversion means 3 converts the data into digital values. Here, let the digital value in the small current mode be (step 5
1) The digital value in the large current mode is set (step 53).

If the value obtained by subtracting the value from the threshold value learning table, which is the threshold value learning means 9, is "2" or less, that is, "there is no deterioration of the battery" (step In step 54), the learning threshold is set to the same value as the initial threshold (step 55). Similarly, if the value obtained by subtracting the value from is less than or equal to "5", that is, "slightly deteriorated battery" (Y in step 56), the learning threshold value is subtracted from the initial threshold value by "5". (Step 57). Further, if the value obtained by subtracting the value from the value of is equal to or less than “8”, that is, “the battery has deteriorated” (Y in step 58), the threshold value to be learned is subtracted from the initial threshold value by “10”. Value (step 59).

The value obtained by subtracting the value from the value of “1” is “1”.
If it is equal to or less than “1”, that is, “battery deterioration is large” (Y in step 60), the learning threshold value is “1” from the initial threshold value.
5 ”is subtracted (step 61). If the value obtained by subtracting the value from the value is larger than “11”, that is, “battery life” (N in step 60), “battery replacement time (life)” is displayed on the display means 7. .

The remaining battery capacity is displayed in the same manner as in the first embodiment using the learned threshold value corresponding to the battery aging. That is, the voltage reading means 2
Reads the voltage value of the battery 1 (step 71) and converts it into a digital value by the AD conversion means 3 (step 72).
The data comparing means 6 compares the battery voltage read value (digital value) converted in step 72 with the learned threshold value "large" (step 73), and if it is larger than the learned threshold value (Y in step 73). Then, the "large" mark is displayed on the display means 7 (step 74). If it is larger than the threshold value "medium" learned in the same manner (Y in step 75), the display means 7
Is displayed (step 76), and if it is greater than the learned threshold value "small" (Y in step 77), a "small" mark is displayed on the display means 7 (step 78). Also,
If the learned threshold is smaller than "small", an "empty" mark is displayed (step 79).

As described above, according to the third embodiment of the present invention, the battery capacity threshold value is re-learned to the threshold value corresponding to the aging of the battery, so that even if the battery has deteriorated, the correct remaining battery capacity can be obtained. The effect that display can be performed is obtained.

[0035]

As described above, the present invention relates to a device having two modes of operation, in which the difference in current consumption between the two is very large, and even when the battery voltage value greatly fluctuates depending on the operation mode, the remaining battery capacity is obtained. Since the display does not fluctuate, there is an effect that a reliable and always correct remaining battery capacity can be grasped. Further, the present invention does not require a special remaining battery capacity detector, and thus has an effect that the design can be performed with a minimum cost.

Also, the present invention has an effect that the remaining battery capacity can be grasped more reliably because the display of the remaining battery capacity does not change even in various operation states.

Further, the present invention has the effect that it is easy to grasp the battery replacement time and the current battery remaining capacity, because the correct remaining battery capacity is displayed even for a deteriorated battery.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of a remaining battery capacity display device according to a first embodiment of the present invention;

FIG. 2 is an operation flowchart of the battery remaining capacity display device according to the first embodiment of the present invention;

FIG. 3 is a schematic block diagram of a remaining battery capacity display device according to a second embodiment of the present invention;

FIG. 4 is a diagram showing a relationship between total current values in each operation mode according to a second embodiment of the present invention;

FIG. 5 is an example of a correction table according to a second embodiment of the present invention;

FIG. 6 is an operation flowchart of a battery remaining capacity display device according to a second embodiment of the present invention;

FIG. 7 is a schematic block diagram of a remaining battery capacity display device according to a third embodiment of the present invention;

FIG. 8 shows an example of a threshold value learning table according to the third embodiment of the present invention;

FIG. 9 is an operation flowchart of a battery remaining capacity display device according to a third embodiment of the present invention;

FIG. 10 is a flowchart showing a continuation of the operation of the battery remaining capacity display device according to the third embodiment of the present invention;

FIG. 11 is a schematic block diagram of a battery remaining capacity display device according to a conventional example.

FIG. 12 shows an example of a conventional battery remaining amount display;

FIG. 13 is an operation flowchart of a battery remaining capacity display device in a conventional example.

[Explanation of symbols]

 1, 10 Battery 2, 11 Voltage reading means 3, 12 AD conversion means 4, 13 Threshold storage means 5 Correction value storage means 6, 14 Data comparison means 7, 15 Display means 8 Correction table 9 Threshold learning means

Claims (4)

[Claims] 1. A battery typified by a lithium ion battery or the like, voltage reading means for reading an analog voltage value of the battery, AD conversion means for converting the read battery voltage to a digital value, and a "large" battery capacity. Threshold value storage means for storing threshold values (digital values) of "medium" and "small" in advance, correction value storage means for correcting the threshold value according to the operation state, read voltage value and voltage value A battery remaining capacity display device comprising: a data comparing means for comparing threshold values; and a display means such as an LCD. 2. The battery remaining capacity display device according to claim 1, further comprising a correction table capable of changing a correction value corresponding to various operation states. 3. The battery remaining capacity display device according to claim 1, further comprising a threshold value learning means for learning a threshold value corresponding to aging of the battery. 4. A step of reading an analog voltage value of a rechargeable battery, a step of converting the read battery voltage into a digital value, and a step of storing in advance in accordance with each of "large", "medium" and "small" battery capacity. The threshold value stored in the means
Applying a correction according to the operation state, comparing the voltage value read as described above with the threshold value corrected according to the operation state, and displaying a comparison result. Battery remaining capacity display method.