JPH04136773A - Apparatus for processing battery driving data and method for displaying battery charged state - Google Patents

Abstract

PURPOSE:To accurately detect the residual quantity of a battery by detecting the charged state of the battery at the ON-time of a power supply to automatically display the same and subsequently starting a system. CONSTITUTION:The temp. in the vicinity of the periphery of a battery 1 is measured by an IC temp. sensor 5 and this measured value is converted into a digital value by an A/D converter 6 to be inputted to a CPU 7. The CPU 7 recognizes the charged state of the battery from these values and the table stored in a memory 12 and issues a command to a display control circuit 8 to display the charged state of the battery on a display apparatus 9. By this method, a user can preliminarily take a measure to deal with the charged state and user's convenience is enhanced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a data processing device powered by a battery.
In particular, the present invention relates to a battery-driven data processing device and a method for displaying the battery state of charge, which are suitable for making a user aware of the state of charge of the battery.

[Prior Art] Personal computers are becoming smaller and more compact, and computers powered by electronics are becoming popular. However, when using a data processing device with only a battery, it can last for only a few hours at most, so if the user is not always aware of the state of charge of the battery, the contents of the memory will be erased when the battery runs out. There is a high possibility. For this reason, conventional battery-powered data processing devices automatically sound an alarm or change the patch υ indicator lamp from blue to red when the remaining battery power becomes low. Alternatively, the state of charge of the battery is displayed by manually issuing the 7N Noteli charge state display command while the data processing device is in use.

In addition, as related to the prior art, JP-A-61-2
No. 86885, JP-A-63-121777, JP-A-1
-113681 and JP-A-1113682.

[Problem to be solved by the invention]

Conventional battery level displays notify the user with sound or light when the battery is running low, so if this happens while you are immersed in your work, you may wonder what happened. It's normal to panic when you don't understand something directly. This may cause erroneous operations such as erroneous operation and deletion of important data. In addition, even though Notonteri displays the remaining amount of charge, it is difficult to detect how much "remaining charge" is actually left, and it is difficult to detect whether it is "fully charged" or not.
``Although it is clear that there is no charging J, the reality is that we have not been able to precisely detect where it is in the intermediate state.

A first object of the present invention is to provide a data processing device and a method for displaying the battery charging state, in which the user can start using the battery after recognizing the charging state, and can avoid panicking when the user encounters a state where there is no battery remaining. It is about providing.

A second object of the present invention is to provide a data processing device that can accurately detect the remaining battery power.

[Means for Solving the Problems] The first purpose is to detect the state of charge of the battery when the power is turned on and automatically display the state of charge before starting the system or when the mechanical power switch is turned off. This is achieved by keeping the power on using software, turning off the system, detecting the state of charge of the battery, automatically displaying the state of charge, and then turning off the power using software.

The second object is achieved by calculating the state of charge of the battery using the temperature and voltage of the battery, or in addition to the temperature and voltage of the battery, using the integrated value of the usage time of the battery.

(Operation) When detecting the state of charge of a battery, a more accurate value can be obtained from the battery.Furthermore, since the remaining amount depends on how much the battery has been used since the fully charged state, it is recommended to use the accumulated value of the usage time. to find a more accurate value.

(Example〕 Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 3 is a characteristic diagram of the battery. Batteries usually have the characteristic that the voltage drops with discharge time. However, this characteristic has a variation factor, and the characteristic changes due to this variation factor, making it impossible to accurately detect the remaining amount. Therefore, it is necessary to enable accurate detection by eliminating these factors, ie, "temperature fluctuations,""discharge current changes due to load fluctuations," and "individual battery variations" shown in FIG. As for fluctuations due to temperature, the ambient temperature of the battery is detected by a temperature sensor, and the detected temperature is calculated and corrected by the CPTJ to eliminate the influence. Changes in discharge current due to load fluctuations are eliminated by detecting them when the battery condition is stable. In this example,
Same load conditions and same timing when the power is turned on (in a stable load state when the data processing device starts up and the system startup check is completed) and when the power is turned off (in a stable load state after the system shutdown process is completed) Detection is performed by software at the system to avoid being affected by load fluctuations. As for the individual variations, as the discharge voltage decreases, the individual variations become thick (as shown by diagonal lines in FIG. 3), so they are detected when the voltage is higher than the variation range. This eliminates the influence of individual variations.

In order to adopt the above detection method, points A and B in Fig.
It turns out that it is sufficient to detect the battery voltage with . Then, it is possible to calculate the remaining battery power from the voltages at these points A and B. In addition, voltage detection is performed by starting the hardware using software, and the software detects the voltage several times and takes the average value to improve accuracy. The voltage value detected in this manner is corrected by the CPU, taking into account the detected temperature value, the integrated usage time value, etc., thereby calculating an accurate state of charge of the battery.

By automatically displaying the charging state whenever the data processing device is turned on and off, the user will be able to use the data processing device knowing the charging state of the battery, which will further improve usability.

FIG. 1 is a configuration diagram of a portion of the data processing device that is related to battery charging state display. As described above, the state of charge of the battery can be ascertained from the voltage and ambient temperature under usage conditions. Therefore, the voltage of the battery is D C/D C which supplies power to the entire device from battery 1.
Before entering the converter 2, a comparator 4 determines which of four states the voltage is in. For example, in Figure 3, the four states are the state from full charge to point A, the state from point A to point C when the midpoint between point A and point B is C, and the state from point 0 to point B. state, 4 of states below point B
It is one. The outputs of these comparators 4 are input to the CPU 7, and the CPU 7 determines which of the above four states the battery voltage is under.

Moreover, the temperature is measured by the IC temperature sensor 5, which measures the temperature near the battery 1. This measured value is converted into a digital value by the A/D converter 6 and input to the CPU 7. CPU
7 learns the battery charging state from these values and the table stored in the memory 12, and issues an instruction to the display control circuit 8 to display the battery charging state on the display device 9. Incidentally, in order to prevent noise from being superimposed on the voltage and temperature detection values of the battery 1, noise removing CR filters 10 are respectively provided.

The voltage detection value and temperature detection value described above are each sampled about five times and are averaged. Then, the memory stores an empirically determined table of how many minutes the battery will last in degrees Celsius for each of the voltage states mentioned above, and reads the remaining battery power from this table. Display as described below. Although it is possible to determine the remaining battery capacity from the voltage value and temperature in this way,
As for accuracy, although it depends on the temperature, it is unavoidable that an error of about 10 to 20 minutes will occur. Therefore, by integrating the usage time and natural discharge time of the battery, that is, the data processing device, and considering these integrated values, it is possible to calculate the remaining amount more accurately.

FIG. 2 is a flowchart showing the processing procedure for displaying the battery charging state. In this embodiment, the battery charging state is displayed when the power switch 3 of the data processing device (Fig. 1) is on (Fig. 2 (a)) and when it is off (Fig. 2 (b)). do. It goes without saying that the information can be displayed at any time while the data processing apparatus is in use by inputting an instruction command from the operator.

In FIG. 2(a), first, when the power switch 3 is turned on, the CPU 7 detects this. 20 The CPU performs a system check of the entire device, and upon completion of this check, samples the battery voltage several times to find its average value, and samples the battery temperature several times to find its average value. Then, by referring to the table in the memory, the state of charge of the battery is known, this is displayed at the lower right of the screen, etc., and O3 such as DO3 is activated.

In FIG. 2(b), when the power switch 3 is turned off, the software functions so as not to immediately shut off the power, and first performs system-off processing. Then, the battery voltage is sampled several times and its average value is determined, and the battery temperature is sampled several times and its average value is determined. The device then refers to a table in the memory to find out the state of charge of the battery, displays this at the bottom right of the screen, etc., and then turns off the power.

〔Effect of the invention〕

According to the invention, when the data processing device is put into use.

Since the battery charging state can always be grasped at the end of the process, the user can take measures in advance to deal with the situation, improving usability.

Furthermore, since the state of charge of the battery is calculated taking into consideration the usage status of the battery, it is possible to obtain an accurate value.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a battery charge state detection portion of a data processing device according to an embodiment of the present invention; FIG. 2(a);
(b) is a flowchart of the battery charging state display processing procedure, and FIG. 3 is a battery characteristic graph. 1...Battery, 2...D C/DC converter, 3...Power supply switch, 4...Comparator, 5...
Temperature sensor, 6... A/D converter, 7... CPU,
8...Display control circuit, 9...Display device. Agent Patent Attorney Tadashi Akimoto Figure 2 Figure 1

Claims (1)

[Claims] 1. In a data processing device driven by a battery, the battery is characterized by having means for detecting the state of charge of the battery when the power is turned on, automatically displaying the state of charge, and then starting the system. Drive data processing device. 2. In a data processing device driven by a battery, when the mechanical power switch is turned off, the software maintains the power on state, and after the system is turned off, detects the state of charge of the battery and automatically displays the state of charge. 1. A battery-powered data processing device characterized by comprising means for cutting off power by software. 3. In a data processing device driven by a battery, a means for detecting the state of charge of the battery when the power is turned on, automatically displaying the state of charge, and then starting the system, and a means for starting the system by means of software when the mechanical power switch is turned off. A battery-powered data processing device characterized by comprising means for maintaining a power-on state, turning off the system, detecting a charging state of a battery, automatically displaying the charging state, and then cutting off the power by software. 4. Any one of claims 1 to 3, comprising means for detecting the temperature of the battery, means for detecting the voltage of the battery, and calculating means for calculating the state of charge of the battery from the detected values of both the detecting means. A battery-powered data processing device characterized by: 5. A battery-driven data processing device according to claim 4, further comprising means for integrating the usage time of the battery and causing the first calculation means to calculate the state of charge of the battery using the integrated value as well. 6. A method for displaying a battery state of charge in a data processing device driven by a battery, comprising automatically displaying the state of charge of the battery when the power is turned on. 7. A method for displaying a battery state of charge in a data processing device driven by a battery, comprising automatically displaying the state of charge of the battery when the power is turned off.