JP2002365348A - Display device for displaying battery remaining capacity - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely display the reducing rate of a battery remaining capacity accompanying the displaying of the battery residue. SOLUTION: When the voltage of a secondary battery 1 is measured by an A/D converter circuit 12, a control circuit 13 controls the display operation of a battery residue display part 18 for displaying the reducing rate of the remaining capacity, together with the residue of the secondary battery 11, on the basis of the battery voltage 112 that is the measurement result from the A/D converter circuit 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery level display device for displaying a battery level in a portable telephone.

[0002]

2. Description of the Related Art A portable telephone is equipped with a rechargeable battery. This battery can be used for a long time in standby mode.
This is the capacity to which the driving power is supplied. However, for example, at the time of creating an e-mail, the battery tends to decrease more quickly than in the standby state due to lighting of an LED or the like.

For example, Japanese Patent Application Laid-Open No. Hei 9-257888 discloses a voltage threshold at the time of a telephone call in which the battery voltage drops as a whole to consume a large amount of current. The value is the reference value Vac of the call state
Vbc · Vcc, and the voltage threshold at the time of standby in which the current consumption is small and the battery voltage drop is small is set to the reference values Va · Vb · Vc corresponding to when not in a call state. The remaining amount is displayed.

In Japanese Patent Application Laid-Open No. Hei 9-257889, since a large amount of current is consumed during a call, if the battery voltage is reduced by VC as a whole as compared with a standby time, a reference value corresponding to the time when the call is not in a call state is set. Va / Vb / Vc to V
By correcting with C, the remaining amount of the battery is displayed.

In Japanese Unexamined Patent Publication No. Hei 10-32933, the charging time is measured, and the number of display cells, which is the remaining amount of the battery immediately before charging after charging is completed, is the remaining battery amount increased from the time required for charging. The number of cells to be increased is calculated and added to the immediately preceding number of cells to display the remaining battery power.

[0006]

However, in any of the above-mentioned prior arts, the threshold value of the voltage is properly used and corrected according to the state and displayed, and the remaining battery level can be accurately determined from the time required for charging. It is calculated and displayed,
It is not possible to calculate whether or not the time to cross the threshold is advanced, and only the remaining amount is displayed. For this reason, although the remaining amount of the battery can be accurately notified, it is impossible to notify whether the remaining amount of the battery tends to decrease quickly.

[0007] That is, the remaining battery level is displayed, for example, as shown in FIG.
This is because the battery voltage is generally represented by a bar graph as shown in FIG. 2, and only the remaining amount is displayed.

[0008] As described above, if there is no way to know whether or not the remaining amount of the battery tends to decrease quickly, for example, the creation of an e-mail is interrupted, or even if the creation is possible, the remaining amount of the battery remains. In some cases, transmission cannot be performed due to the disappearance of. In such a case, it is necessary to charge the battery of the mobile phone once and then re-create and send the e-mail.
When urgently needed, there is a disadvantage that it is useless.

The present invention has been made in view of such a situation, and provides a battery remaining amount display device capable of accurately displaying the speed at which the battery remaining amount decreases as well as displaying the battery remaining amount. Is what you can do.

[0010]

According to a first aspect of the present invention, there is provided a battery remaining amount display device which displays a secondary battery serving as a driving source and a speed at which the remaining amount decreases in accordance with the display of the remaining amount of the secondary battery. A battery remaining amount display unit, an A / D converter circuit for measuring the voltage of the secondary battery, and control for controlling a display operation of the battery remaining amount display unit based on a battery voltage as a measurement result from the A / D converter circuit. And a circuit. When the control circuit receives the battery voltage, the control circuit converts the received battery voltage to Vn.
ow, read the Vold stored in the memory of the control circuit, compare the difference with Vnow, and compare the difference with the voltage thresholds V1 to V stored in the memory.
When two or more of the five are straddled, the display of the remaining battery level in the remaining battery level display unit can be updated. In addition, when the difference due to the comparison is over two or more, the control circuit reads out Told stored in the memory and calculates the difference from Tnow, which is the absolute time when the battery voltage is measured, and calculates the difference. If it is determined that the voltage is shorter than the value Ts, which is the time required to reduce one voltage threshold in a static state,
By recognizing that the remaining amount of the secondary battery tends to decrease quickly, it is possible to update the display of the remaining battery amount in the remaining battery amount display section. When the control circuit recognizes that the remaining amount of the secondary battery tends to decrease quickly, the control circuit updates the display of the remaining battery amount in the battery remaining amount display unit so as to be lowered horizontally by one step and further diagonally by another step. You can do so. In the battery remaining amount display method according to the fifth aspect, the first step in which the driving source is obtained by the secondary battery and the remaining amount of the secondary battery are reduced by the battery remaining amount display unit in accordance with the display of the remaining amount of the secondary battery. A second step in which the speed is displayed, a third step in which the voltage of the secondary battery is measured by the A / D converter circuit, and a battery voltage which is a measurement result from the A / D converter circuit by the control circuit. Based on
And a fourth step in which a display operation of the battery remaining amount display section is controlled. In the fourth step, when the battery voltage is received, the received battery voltage is set to Vnow, and the Vo voltage stored in the memory of the control circuit is set.
a fifth step in which ld is read and the difference from Vnow is compared; and when the difference by comparison straddles two or more of the voltage thresholds V1 to V5 stored in the memory, The display of the remaining battery level in the remaining level display section is updated.
And a step of: Further, in the sixth step, when the difference by comparison is over two or more, Told stored in the memory is read out, and the difference from Tnow, which is the absolute time when the battery voltage is measured, is calculated. When it is determined that the difference between the seventh step and the calculation is shorter than the value Ts, which is the time during which one voltage threshold value decreases in a static state, the remaining amount of the secondary battery tends to decrease quickly. And an eighth step of updating the display of the remaining battery level in the remaining battery level display section. In the eighth step, when it is recognized that the remaining amount of the secondary battery tends to decrease quickly, the display of the remaining amount of the battery in the remaining battery amount display section is lowered horizontally by one level, and further diagonally. It can be updated to be lowered one step. In the battery remaining amount display device according to the present invention, when the voltage of the secondary battery is measured by the A / D converter circuit, the control circuit uses the battery voltage which is the measurement result from the A / D converter circuit, The display operation of the battery remaining amount display unit for displaying the speed at which the remaining amount decreases in conjunction with the display of the remaining amount of the secondary battery is controlled.

[0011]

Embodiments of the present invention will be described below.

FIG. 1 is a view showing an embodiment of a battery remaining amount display device according to the present invention. FIGS. 2 to 5 are diagrams for explaining a battery remaining amount display method by the battery remaining amount display device of FIG. FIG.

The battery remaining amount display device shown in FIG. 1 is built in the portable telephone body 1 having a transmitting / receiving circuit 14, an antenna 15, a charging terminal (+) 16, and a charging terminal (-) 17, and Secondary battery 11, A / D converter circuit 1
2. The control circuit 13 is provided.

The secondary battery 11 is a rechargeable battery such as a nickel-cadmium battery.
The charging is performed by the charging terminal (−) 17. A /
The D converter circuit 12 measures the voltage of the secondary battery 11 using the measurement request signal 111 from the control circuit 13 as a trigger, and outputs the measured battery voltage 112 to the control circuit 13.
To inform.

The control circuit 13 controls a transmission / reception circuit 14 for transmitting / receiving data to / from a wireless network via an antenna 15, and controls an A / D conversion operation of the A / D converter circuit 12, and the like. When controlling the transmission / reception circuit 14, the control signal 13 is transmitted from the control circuit 13 to the transmission / reception circuit 14.
Is sent. At this time, transmission / reception data 114 is transmitted from the transmission / reception circuit 14 to the control circuit 13.

The control circuit 13 is adapted to operate on the basis of the battery voltage 112 from the A / D converter circuit 12, for example, as shown in FIG.
The display state of the battery remaining amount display section 18 shown in FIG.
, Which will be described in detail later. The control circuit 13 includes a memory (not shown). This memory contains Vold, T described later.
old, voltage thresholds V1 to V5 and the like are stored.

Next, a description will be given of a method of displaying the remaining battery charge by the battery remaining amount display device having such a configuration.

First, as shown in FIG. 2, the control circuit 13 sends a measurement request signal 11 to the A / D converter circuit 12.
1 issues a battery voltage measurement request (step S
1). The measurement request signal 111 is periodically sent to the A / D converter circuit 12.

At this time, when the voltage of the secondary battery 11 is measured by the A / D converter circuit 12 using the measurement request signal 111 as a trigger, the measurement result is notified to the control circuit 13 as a battery voltage 112. When the control circuit 13 receives the battery voltage 112, the battery voltage 112 is substituted for Vnow, and Vold and Told stored in the memory of the control circuit 13 are read (step S).
2, S3).

Here, the difference between Vold and Vnow is compared (step S4). As a result of the comparison, as shown in FIG. 5, when two or more of the voltage thresholds V1 to V5 are straddled, the display of the remaining battery level is updated. In this case, a difference between Told and Tnow, which is the absolute time when the battery voltage 112 is measured, is calculated (step S5).

The difference Told between Told and Tnow is a value T which is the time required to decrease by one voltage threshold in a static state such as during standby.
If it is shorter than s, it is determined that the remaining amount of the secondary battery 11 tends to decrease quickly, and the remaining amount display is lowered horizontally by one step and further diagonally by another step (steps S6 and S9).
The display state at this time changes as shown in FIGS.

If the difference between Told and Tnow is longer than the value Ts, which is the time required to decrease by one voltage threshold in a static state such as during standby, the remaining amount of the secondary battery 11 becomes static. As a result, the remaining amount display is lowered horizontally by one step (steps S6 and S7). The display state at this time is shown in FIG.
become that way.

When the display of the remaining amount is updated in (Step S7) or (Step S9), Vnow changes to Vold and Tn changes to Told.
ow is updated to Told (step S8),
The process ends at (Step S10).

In step S4, the values of Vold and Vn are determined.
When the difference from ow crosses one or less of the voltage thresholds V1 to V5 shown in FIG. 5, the remaining amount display is not updated, and the process ends in (Step S10).

As described above, in this embodiment, when the voltage of the secondary battery 11 is measured by the A / D converter circuit 12, the control circuit 13 controls the A / D converter circuit 1.
Since the display operation of the battery remaining amount display section 18 for displaying the speed at which the remaining amount decreases in accordance with the remaining amount of the secondary battery 11 is controlled based on the battery voltage 112 which is the measurement result from Step 2. In addition, the speed at which the remaining battery power decreases can be accurately displayed along with the display of the remaining battery power.

As described above, by accurately displaying the rate at which the remaining battery capacity decreases in conjunction with the display of the remaining battery capacity, the user can be alerted. For example, the remaining battery capacity decreases quickly. When e-mails tend to be created, the e-mails can be created and transmitted shortly.

[0027]

As described above, according to the battery remaining amount display device according to the present invention, when the voltage of the secondary battery is measured by the A / D converter circuit, the control circuit outputs the voltage from the A / D converter circuit. Based on the battery voltage that is the measurement result, the display operation of the battery remaining amount display unit that displays the speed at which the remaining amount decreases along with the display of the remaining amount of the secondary battery is controlled. In addition, the speed at which the remaining battery power decreases can be accurately displayed.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of a battery remaining amount display device according to the present invention.

FIG. 2 is a flowchart illustrating a method of displaying a remaining battery level by the remaining battery level display device of FIG. 1;

FIG. 3 is a diagram for explaining a method of displaying a remaining battery level by the remaining battery level display device of FIG. 1;

FIG. 4 is a diagram for explaining a method of displaying a remaining battery level by the remaining battery level display device of FIG. 1;

FIG. 5 is a diagram for explaining a method of displaying a remaining battery level by the remaining battery level display device of FIG. 1;

FIG. 6 is a diagram for explaining a conventional example of remaining battery level display.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mobile phone main body 11 Secondary battery 12 A / D converter circuit 13 Control circuit 14 Transmission / reception circuit 15 Antenna 16 Charging terminal (+) 17 Charging terminal (-) 18 Battery remaining amount display part 111 Measurement request signal 112 Battery voltage 113 Control signal 114 Transmission / reception data

Claims (8)

[Claims] A secondary battery serving as a driving source; a battery remaining amount display unit for displaying a speed at which the remaining amount decreases in accordance with a display of the remaining amount of the secondary battery; and measuring a voltage of the secondary battery. A battery level display, comprising: an A / D converter circuit; and a control circuit that controls a display operation of the battery level display unit based on a battery voltage that is a measurement result from the A / D converter circuit. apparatus. 2. The control circuit, upon receiving the battery voltage, sets the received battery voltage to Vnow,
The voltage stored in the memory of the control circuit is read, and the difference between the voltage and Vnow is compared. The difference by the comparison straddles two or more of the voltage thresholds V1 to V5 stored in the memory. The display of the remaining battery level in the remaining battery level display section is updated when the current status is displayed.
The battery remaining amount display device according to 1. 3. The control circuit reads the Told stored in the memory and determines the difference from Tnow, which is the absolute time of measuring the battery voltage, when the difference due to the comparison straddles two or more. When it is determined that the difference by the calculation is shorter than the value Ts, which is the time required to reduce one voltage threshold in a static state, it is recognized that the remaining amount of the secondary battery tends to decrease quickly. 3. The battery remaining amount display device according to claim 2, wherein the display of the battery remaining amount in the battery remaining amount display unit is updated. 4. The control circuit, when recognizing that the remaining amount of the secondary battery tends to decrease quickly, lowers the display of the remaining battery amount in the remaining battery amount display unit by one level horizontally and further obliquely. 4. The method according to claim 3, wherein the data is updated to be lowered by one step.
The battery remaining amount display device according to 1. 5. A first step in which a driving source is obtained by a secondary battery, and a second step of displaying a rate at which the remaining amount of the secondary battery decreases in accordance with the display of the remaining amount of the secondary battery by a battery remaining amount display unit. And a third step in which the voltage of the secondary battery is measured by an A / D converter circuit. The control circuit detects the battery based on a battery voltage that is a measurement result from the A / D converter circuit. And a fourth step in which a display operation of the remaining amount display unit is controlled. 6. In the fourth step, when the battery voltage is received, the received battery voltage is set to Vn.
a fifth step in which the voltage stored in the memory of the control circuit is read out and the difference between the voltage and the Vnow is compared, and the difference obtained by the comparison is a voltage stored in the memory. 6. The method according to claim 5, further comprising the step of: updating the display of the remaining battery level in the remaining battery level display section when the vehicle runs across two or more of the threshold values V1 to V5. Battery level display method described in. 7. In the sixth step, when the difference by the comparison is over two or more, Told stored in the memory is read and the absolute time when the battery voltage is measured. A seventh step in which a difference from Tnow is calculated; and when it is determined that the calculated difference is shorter than a value Ts, which is a time required to reduce one voltage threshold in a static state, The battery according to claim 6, further comprising an eighth step of recognizing that the remaining amount of the battery tends to decrease quickly and updating the display of the remaining battery amount of the remaining battery amount display unit. How to display the remaining amount. 8. In the eighth step, when it is recognized that the remaining amount of the secondary battery tends to decrease quickly, the display of the remaining amount of the battery in the remaining battery amount display section is lowered horizontally by one step. 8. The method according to claim 7, wherein the display is updated so as to be further lowered diagonally.