JPH0587896A - Battery rest quantity detection/correction method - Google Patents

Abstract

PURPOSE:To obtain the correct battery rest quantity calculation value by correcting the battery rest quantity calculation value on the basis of the actual battery rest quantity at a prescribed voltage, correcting the battery capacity feom the battery rest quantity calculation value at a prescribed voltage and reducing the difference between the actual battery rest quantity and the battery rest quantity calculation value, in the battery rest quantity detection/correction method. CONSTITUTION:A consumed electric current calculation part 3 for accumulating the consumed electric current supplied from a battery 1 and a battery rest quantity correction part 5 for correcting the battery rest quantity calculation value at each prescribed voltage which is obtained from the value accumulated by the consumed electric current calculation part 3, from the actual battery rest quantity at each prescribed voltage of the battery 1 are provided. Accordingly, the battery rest quantity calculation value which is obtained by subtraction calculating the accumulative value of the consumed electric current which is calculated by the consumed electric current calculation part 3 from the battery rest quantity calculation value which is corrected at each prescribed voltage by the battery rest quantity correction part 5 is displayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery remaining amount detecting / correcting system for detecting / correcting a battery remaining amount.

[0002]

2. Description of the Related Art Conventionally, the remaining amount of a battery mounted in a portable computer system such as a notebook computer or connected to it externally depends on the number of times the switch is turned on and off, the operating time during operation, and the current consumption. The remaining amount was calculated and displayed by, for example.

[0003]

When the current consumption is measured and the battery remaining amount is calculated during the conventional operation, the actual battery remaining amount differs from the actual battery remaining amount because the battery capacity changes depending on the battery deterioration and the battery usage environment. However, there is a problem in that there is a large difference between the battery residual amount calculation value calculated by integrating the power consumption.

Further, in the case of calculating the battery residual amount calculated value from the battery voltage, if the load capacity during use changes, the battery voltage also changes, so that the battery residual amount calculated value cannot be calculated only by the voltage change. There's a problem. In particular,
When the battery is fully charged like a nickel-cadmium battery,
In the case of a battery in which the voltage changes only when the W battery voltage is present and the voltage hardly changes otherwise, there is a problem that the remaining battery level cannot be calculated only by the voltage change.

When the calculated battery residual amount calculated by the above-mentioned method is displayed, a large difference occurs between the actual battery residual amount and the battery residual amount calculated value, and the battery residual amount calculated value is displayed. However, there is a problem in that the power supply to a battery-powered notebook computer or the like is cut off, making it unusable, resulting in data loss.

The present invention provides a battery full charge voltage, LOW
Correct the remaining battery level calculated from the current consumption based on the actual remaining battery level obtained in advance for battery voltage, dead battery voltage, etc., or calculate the battery capacity from the remaining battery level calculated at LOW battery voltage. It is intended to obtain an accurate calculated value of the remaining battery amount by correcting the difference between the actual battery remaining amount of the battery and the calculated value of the remaining battery amount.

[0007]

FIG. 1 is a block diagram showing the principle of the present invention. In FIG. 1, the consumption current calculation unit 3 accumulates consumption current supplied from the battery 1 to the device.

The battery remaining amount correction section 5 is provided with a plurality of predetermined voltages (for example, full charge voltage, L
The battery residual amount calculation value at the predetermined voltage obtained from the value accumulated by the consumption current calculation unit 3 is corrected by the actual battery residual amount in the OW battery voltage, the dead battery voltage, etc.).

The battery capacity correction unit 6 calculates the actual remaining battery capacity at a predetermined voltage (for example, LOW battery voltage) of the battery 1 which has been obtained in advance, and the consumed current calculation unit 3
The battery capacity is corrected by calculating the difference from the battery residual amount calculation value obtained from the accumulated value.

[0010]

According to the present invention, as shown in FIG. 1, the consumption current calculator 3 accumulates the consumption current supplied from the battery 1 to the device,
The consumption current calculation unit 3 calculates the consumption current according to the actual remaining battery amount at a plurality of predetermined voltages (for example, full charge voltage, LOW battery voltage, dead battery voltage, etc.) of the battery 1 which is obtained in advance by the battery remaining amount correction unit 5. Of the battery remaining amount calculated from the accumulated value at the accumulated predetermined voltage, and the battery remaining amount calculated value obtained by subtracting the accumulated value of the consumed current calculated by the consumed current calculating unit 3 from the corrected battery remaining amount calculated value. Is displayed.

Further, the current consumption calculation unit 3 accumulates the current consumption supplied from the battery 1 to the device, and the battery capacity correction 6
Predetermined voltage (for example, LO
Actual battery level at W battery voltage, etc.,
The difference from the battery residual amount calculation value obtained from the value accumulated by the consumption current calculation unit 3 is calculated, the battery capacity is corrected and stored, and the consumption current calculated by the consumption current calculation unit 3 is calculated from the stored battery capacity. The battery remaining amount calculation value obtained by subtracting the cumulative value is displayed.

Therefore, the full charge voltage of the battery 1, LOW
Correct the remaining battery level calculation value calculated from the current consumption based on the previously calculated actual remaining battery level such as the battery voltage and dead battery voltage, and display the accurate remaining battery level calculation value. The actual battery level is calculated by correcting the battery capacity based on the difference between the calculated battery remaining amount at the time of battery voltage and the actual battery remaining amount and displaying the accurate calculated battery remaining amount. It is possible to reduce the difference between the remaining amount and the battery remaining amount calculated value, and obtain and display an accurate battery remaining amount calculated value.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the structure and operation of an embodiment of the present invention will be described in detail with reference to FIGS.

FIG. 1 is a block diagram showing the principle of the present invention. Figure 1
(A) is a principle configuration diagram of the present invention, in which the battery residual amount calculation value obtained from the accumulated current consumption value (W) is corrected by the actual battery residual amount at the predetermined voltage obtained in advance. The principle configuration diagram of the following is shown. A detailed description will be sequentially given below with reference to (a) of FIG. 1 and FIGS. 2 to 4.

In FIG. 1A, the battery 1 has a D
It is a battery that supplies the C power supply to the system, and is a battery for which a battery residual amount calculation value is obtained. The voltage detection unit 2 detects the voltage when the battery 1 supplies DC power to the system and is discharged.

The current consumption calculation unit 3 operates from the battery 1 to DC.
This is to calculate the cumulative current consumption of the power supply to the system. The battery remaining amount calculation unit 4 obtains a battery remaining amount calculation value by subtracting the cumulative value of the consumption current calculated by the consumption current calculation unit 3 from the battery capacity of the battery 1.

The battery remaining amount correction unit 5 has a plurality of predetermined voltages (for example, full charge voltage, L, etc.) of the battery 1 obtained in advance.
The battery remaining amount calculation value at the predetermined voltage obtained from the value accumulated by the consumption current calculation unit 3 is corrected by the actual battery remaining amount in the OW battery voltage, the dead battery voltage, etc. (described later with reference to FIG. 3). To).

The remaining amount display is calculated by subtracting the accumulated current consumption value by the consumed current calculation unit 3 from the calculated battery remaining amount value corrected by the remaining battery amount correction unit 5 and calculating the remaining battery amount value of the battery 1. The remaining amount is displayed on the display.

FIG. 2 is a block diagram of an embodiment of the present invention, and shows a concrete circuit example of the principle block diagram of FIG.
In FIG. 2, the battery voltage shift unit 21 shifts the voltage of the battery 1 so that the A / D conversion unit 22 can perform A / D conversion.

The A / D conversion section 22 converts the analog voltage after being shifted by the battery voltage shift section 21 into a digital voltage. The consumed current / voltage conversion unit 31 converts the consumed current supplied from the battery 1 to the DC-DC converter 7 into a voltage.

The A / D converter 32 converts the consumed current into a digital voltage. Current consumption integrating unit 33
Is for calculating, for example, W with respect to the consumed current converted into digital by the A / D converter 32, based on the time signal from the timer 23.

The battery remaining amount calculation unit 4 calculates the remaining battery amount based on the value obtained by accumulating the consumed current by the consumed current calculating unit 33. For example, a value obtained by accumulating the consumed current from the battery capacity is calculated. This is for obtaining the subtracted battery residual amount calculation value.

The battery remaining amount correction unit 5 is composed of the A / D conversion unit 2
When the voltage of the battery 1 input from 2 reaches a plurality of predetermined voltages (for example, full charge voltage, LOW battery voltage, dead battery voltage, etc.), the battery remaining amount calculation unit 4
The calculated battery residual amount is corrected so as to match the calculated battery residual amount calculated in advance with the actual battery residual amount of the battery 1 (described later with reference to FIG. 3).

The battery remaining amount calculation value is set by setting the battery remaining amount calculated from the battery remaining amount calculation value after the battery remaining amount correction unit 5 corrects it with a predetermined voltage (full charge voltage, LOW battery voltage, dead battery voltage, etc.). This means that the battery remaining amount calculation value obtained by subtracting the cumulative value of the consumed current calculated by the calculation unit 4 is set to be displayed.

The remaining amount display indicates that the calculated remaining battery amount is displayed on the display in response to the setting of the calculated remaining battery amount. Next, the operation will be described.

(1) When DC power is supplied from the battery 1 to the system via the DC-DC converter 7, the consumption current / voltage conversion unit 31 converts the consumption current into a voltage, which is then converted into the A / D conversion unit 32. As a result, it is converted into a digital consumption current in synchronization with a signal from the timer 23 at predetermined time intervals.

(2) With respect to the digital consumption current converted in (1), the consumption current accumulating unit 33 obtains the accumulated value (W) of the consumption current, and the battery remaining amount calculation unit 4 causes the battery 1
The cumulative value (W) of the consumed current is subtracted from the battery capacity of 1 to sequentially obtain the battery residual amount calculated value.

(3) Further, the battery voltage shift unit 21
Shifts the voltage of the battery 1 and inputs it to the A / D converter 22, and the A / D converter 22 converts it into a digital battery voltage in synchronization with a signal from the timer 23 at every predetermined time.

(4) When the battery voltage converted in (3) reaches a predetermined voltage obtained in advance (for example, full charge voltage, LOW battery voltage, dead battery voltage, etc.), the battery remaining amount correction unit 5 The battery remaining amount calculation value notified from the battery remaining amount calculation unit 4 at this predetermined voltage is corrected so as to match the actual battery remaining amount at the predetermined voltage obtained in advance (see FIG. 3). See below). Based on the corrected battery remaining amount calculated value, the battery remaining amount calculated value obtained by subtracting the accumulated current consumption value by the battery remaining amount calculation unit 4 is set as the battery remaining amount calculated value, and the remaining amount is displayed. ..

Therefore, when the battery remaining amount correction unit 5 detects that the voltage of the battery 1 becomes equal to a predetermined voltage (for example, full charge voltage, LOW battery voltage, dead battery voltage, etc.) during discharging of the battery 1. , The battery remaining amount calculated value is subtracted from the battery remaining amount calculated value so as to match the actual battery remaining amount obtained in advance at the predetermined voltage, and the battery remaining amount calculated value is obtained. To display. As a result, even if the battery is deteriorated, it is possible to always display the accurate calculated remaining battery amount.

FIG. 3 shows an operation explanatory diagram of the present invention. Figure 3
(A) shows a battery discharge curve. Here, the horizontal axis represents time t, the vertical axis represents the voltage when the battery 1 is discharged, and the shaded area represents the battery capacity. This battery discharge curve is for a nickel cadmium battery.

(A) is the fully charged voltage, which is the voltage when the battery 1 is fully charged. (B) is
It is the voltage before discharging from the fully charged voltage of (A) to a constant voltage.

(C) is a LOW battery voltage,
It is the voltage when the voltage sharply drops from the constant voltage of (B). (D) is the dead battery voltage,
It is the voltage when the voltage drops more sharply than in (C) and current cannot be supplied to the system any more.

According to experiments, the voltages of (A), (B), (C), and (D) and the remaining battery level at that time are as follows.
For nickel cadmium batteries the following values were obtained: (A): 10.5V battery remaining 90% (B): 10.0V battery remaining 70% (C): 8.8V battery remaining 10% (D): 7.5V battery remaining 0% (b) of FIG. 3 shows a discharge curve when the battery residual amount calculation value is not corrected. Here, the solid line represents the actual remaining battery amount, and the dotted line represents the calculated remaining battery amount. Here, since the battery remaining amount is initially made small and the cumulative value of the consumed current is subtracted to obtain the battery remaining amount calculated value, the actual battery remaining amount is 25% even if the battery remaining amount calculated value becomes 0%. It remains, and it means that a large error has occurred. In this case, the calculated value of the battery remaining amount becomes 0%, and the image is like that the system is down, and the error of the calculated value of the remaining battery amount is extremely large. I am trying to fix it.

FIG. 3C shows an example of calculating the remaining amount of a normal battery. The dotted line represents the actual remaining battery amount, and the solid line represents the calculated remaining battery amount calculated and corrected.

(A) The battery residual amount calculated value at the full charge voltage is corrected so as to match the actual battery residual amount at the time of the (A) full charge voltage measured in advance. Become. Then, the value obtained by accumulating the consumed current is subtracted from the corrected battery residual amount calculated value to obtain the battery residual amount calculated value indicated by the dotted line (slightly deviated from the actual battery residual amount indicated by the solid line).

(B) The battery residual amount calculation value at a constant voltage,
Since the correction is made so as to match the actual battery remaining amount when the (B) constant voltage is measured in advance, the two match. Then, the value obtained by accumulating the consumption current is subtracted from the corrected battery residual amount calculated value to obtain the dotted battery residual amount calculated value (the actual battery residual amount gradually deviates from the solid line).

Since the calculated value of the battery remaining amount at the (C) LOW battery voltage is corrected so as to match the actual battery remaining amount at the time of the (C) LOW battery voltage measured in advance, it is determined that the two values match. Become. Then, the value obtained by accumulating the consumed current is subtracted from the corrected battery residual amount calculated value to obtain the battery residual amount calculated value indicated by the dotted line (slightly deviated from the actual battery residual amount indicated by the solid line).

(D) The dead battery voltage is used to correct the calculated battery residual amount so as to match the actual battery residual amount at the (D) dead battery voltage measured in advance. Become. At the time of this (D) dead battery voltage, the calculated value of the battery remaining amount matches the battery remaining amount = 0, so it becomes 0%, and the battery 1 is displayed to be replaced with a new battery.

FIG. 3D shows an example of calculating the remaining amount of the deteriorated battery. The dotted line represents the actual remaining battery amount, and the solid line represents the calculated remaining battery amount calculated and corrected. In this case, since the battery 1 is deteriorated, (A), (B),
Since the correction is similarly performed with the voltages of (C) and (D), the calculated battery remaining amount changes so as to be close to the actual battery remaining amount.

Next, the operation of the configuration of FIG. 1A and FIG. 2 will be described in detail according to the order shown in the flow chart of FIG. In FIG. 4, S1 detects current consumption. This corresponds to the consumed current / voltage converter 31, the A / D converter 3 of FIG.
2. The timer 23 detects the consumption current supplied from the battery 1 to the DC-DC converter 7.

In step S2, the current consumption is calculated. This is because the current consumption accumulating unit 33 in FIG. 2 calculates the cumulative value (W) of the current consumption based on the signal from the timer 23 at constant time intervals. S
3 determines whether the voltage of the battery 1 is higher or lower than the (A) voltage ((A) full charge voltage in (A) of FIG. 3).
In the case of a large value, the voltage of the battery 1 is found to be higher than the (A) full-charge voltage, and therefore the remaining battery amount calculation value is displayed as it is in S4. On the other hand, if it is small, the battery 1
Since it was found that the voltage of the battery is lower than the (A) full charge voltage, S
Go to 5.

In step S5, it is determined whether or not the remaining amount is corrected. This is to determine whether or not (A) the difference between the battery remaining amount obtained in advance at the full charge voltage and the battery remaining amount calculated value is larger than a predetermined value, and the remaining amount correction is necessary. If yes, the remaining amount is corrected as described in S6 (the battery remaining amount calculation value is corrected to the battery remaining amount that has been obtained in advance).
Then, the process proceeds to S7. If there is none, the process proceeds to S7 without correcting the remaining amount.

In step S7, it is determined whether the voltage of the battery 1 is higher or lower than the (B) voltage (the (B) constant voltage in (A) of FIG. 3). In the case of a large value, the remaining battery amount calculation value is displayed as it is in S4. On the other hand, if it is small, S8
Proceed to.

In S8, it is determined whether or not the remaining amount is corrected. If yes, the remaining amount is corrected (correction of the battery remaining amount calculated value to the previously obtained battery remaining amount) as described in S9, and the process proceeds to S10. If there is none, the process proceeds to S10 without correcting the remaining amount.

S10, the voltage of the battery 1 is higher than the (C) voltage ((C) LOW battery voltage of (A) of FIG. 3),
Alternatively, it is determined whether it is small. In the case of a large value, the remaining battery amount calculation value is displayed as it is in S4. On the other hand, if it is small, the process proceeds to S11.

In step S11, it is determined whether or not the remaining amount is corrected. If yes, the remaining amount is corrected as described in S12, and the remaining amount is displayed in S4. If there is none, the remaining amount is displayed in S4.

By the above, (A) full charge voltage, (B)
By correcting the calculated battery remaining amount with the voltage of the constant voltage (C) LOW battery voltage to the battery remaining amount obtained in advance with these voltages, the corrected battery remaining amount is always corrected to the correct battery remaining amount. It is possible to display the calculated value.

Next, referring to FIG. 1B, FIG. 5 and FIG. 6, the configuration and operation of the embodiment in the case of correcting the battery capacity by the actual battery remaining amount at the predetermined voltage obtained in advance will be sequentially described. The details will be described.

In FIG. 1B, the battery 1 has a D
DC to the system (device) via the C-DC converter 7
It is a battery that supplies power and the like, and is a battery whose battery capacity is corrected.

The voltage detector 2 detects the voltage when the battery 1 is supplied with DC power to the system and is discharged, and is composed of a voltage detector 21 and an A / D converter 22. Is.

The voltage detector 21 outputs the voltage of the battery 1 to A
The voltage range that can be detected by the / D converter 22 is set. The A / D converter 22 converts the consumed current into a digital voltage.

The current consumption calculation unit 3 operates from the battery 1 to the DC
The current consumption to be supplied to the DC converter 7 is cumulatively calculated, and is composed of a current consumption / voltage conversion unit 31, an A / D conversion unit 32, and a current consumption integration unit 33.

The consumption current-voltage conversion unit 31 converts the consumption current supplied from the battery 1 to the DC-DC converter 7 into a voltage. The A / D converter 32 converts the consumed current into a digital voltage.

The current consumption integrating unit 33 is the A / D converting unit 32.
The consumed current converted into a digital value by is integrated. The battery capacity correction unit 6 calculates the remaining battery amount calculated from the value integrated by the current consumption integration unit 33 at a predetermined voltage (for example, LOW battery voltage) (= battery capacity-integrated value), and the battery previously calculated. The battery capacity is corrected by calculating the difference from the actual remaining battery capacity at the predetermined voltage of 1.

The operation concept of the configuration of FIG. 1B will be described with reference to FIG. FIG. 5A shows a discharge diagram of a battery having 100% battery capacity. The solid line represents the actual remaining battery amount, and the dotted line represents the calculated remaining battery amount obtained by subtracting the cumulative value of the consumed current from the battery capacity. The calculated remaining battery amount is calculated to be slightly smaller than the actual remaining battery amount as shown in the figure.

In FIG. 5A, when the time t = 0, the battery capacity is 100%, so the calculated remaining battery amount is equal to the actual remaining battery amount. As the time elapses, the calculated remaining battery amount becomes slightly smaller than the actual remaining battery amount.

FIG. 5B shows a discharge diagram of a battery having 80% battery capacity. The solid line represents the actual remaining battery amount, and the dotted line represents the calculated remaining battery amount obtained by subtracting the cumulative value of the consumed current from the battery capacity.

In FIG. 5B, when the time t = 0, the battery capacity after replacement is 80%, so the calculated remaining battery amount is 80% of the actual remaining battery amount.
Has become. As time passes, a predetermined voltage (for example, LOW
Battery voltage: The battery residual amount calculation value (the value obtained by subtracting the cumulative value of the consumption current from the battery capacity) when the battery 1 holds a constant voltage and further discharges and drops sharply Here, it is larger than the remaining battery level by L. In this embodiment, this L portion is subtracted from the battery capacity and stored as the battery capacity of the battery 1 currently in use. After this storage, when the battery remaining amount calculation value obtained by subtracting the cumulative value of the consumed current from the new corrected battery capacity is obtained, it will be the same as the actual battery remaining amount as shown in (c) of FIG. ..

FIG. 5C shows a battery discharge diagram after correction of the battery capacity. This is because the battery capacity is as shown in the figure by the amount L, which is the difference between the calculated remaining battery amount obtained at a predetermined voltage (eg, LOW battery voltage) in FIG. 5B and the actual remaining battery amount. Since the correction is made to, the calculated remaining battery amount and the actual remaining battery amount become substantially equal over time.

Next, the operation of the configuration of FIG. 1B will be described in detail in the order shown in the flow chart of FIG. In FIG. 6, S21 detects the discharge current. In this, the consumption current-voltage converter 31 and the A / D converter 32 of FIG. 1B detect the consumption current sent from the battery 1.

In step S22, the battery remaining amount is calculated. This subtracts the cumulative value of the current consumption detected in S21 from the battery capacity to obtain the battery residual amount calculation value. S23
Determines whether (C) voltage or less. This is (b) in Figure 1.
It is determined whether or not the battery voltage detected by the voltage detector 21 and the A / D conversion unit 22 is less than (C) voltage (LOW battery voltage). In the case of YES, the battery voltage has become equal to or lower than the LOW battery voltage, so the battery correction of S24 to S28 is performed. In the case of NO, the voltage is equal to or higher than the LOW battery voltage, so the process proceeds to S29.

In step S24, it is determined whether the correction is positive. Since this is found to be equal to or lower than the (C) voltage (LOW battery voltage) in S23, it is determined whether or not the battery residual amount calculation value at this time is larger than the actual battery residual amount, and it is necessary to perform positive correction. .. In the case of YES, a positive correction is calculated in S27, and the battery capacity is positively corrected in S28 (see FIG. 5).
(See (c)) and proceed to S29. On the other hand, in the case of NO, a negative correction is calculated in S25, the battery capacity is negatively corrected in S26, and the process proceeds to S29.

In S29, it is determined whether or not the battery is discharged,
If YES, S21 and subsequent steps are repeated, and if NO, end (END). As described above, when the battery 1 is discharged to reach the (C) voltage (LOW battery voltage), the difference between the battery remaining amount calculation value and the actual battery remaining amount obtained in advance is obtained, and this difference is calculated. Since it is corrected to the battery capacity, when the battery 1 deteriorates or is replaced, the battery capacity is automatically corrected to the correct value, and the accumulated current consumption value is subtracted from the corrected correct battery capacity to obtain the correct value. It is possible to obtain a calculated battery remaining amount.

[0065]

As described above, according to the present invention,
Accurate battery remaining amount calculation by correcting the battery remaining amount calculation value calculated from the current consumption based on the actual battery remaining amount obtained in advance such as the full charge voltage of the battery 1, the LOW battery voltage, and the dead battery voltage. Display values,
Because the battery capacity is corrected based on the difference between the calculated remaining battery value at the time of LOW battery voltage, etc. and the actual battery capacity, an accurate calculated remaining battery value is displayed. , The difference between the actual battery remaining amount and the battery remaining amount calculated value can be made smaller, and an accurate battery remaining amount calculated value can be obtained and displayed.
Thereby, (1) a function for correcting the battery residual amount calculated value from the battery discharge voltage is provided to further reduce the difference between the actual battery residual amount and the battery residual amount calculated value calculated from the accumulated value of the consumed current. It is possible to prevent sudden system down. In particular, when a battery is connected as an external power source of a portable personal computer, even if the battery is replaced with another one, a plurality of voltages (full charge voltage, LOW
The battery remaining amount calculated value can be sequentially corrected by the battery voltage, the dead battery voltage, etc., and the accurate battery remaining amount calculated value can always be displayed.

(2) Since the battery capacity is corrected to the correct value by providing the function of correcting the battery capacity from the battery discharge voltage, an accurate value obtained by subtracting the cumulative value of the consumed current from the corrected correct battery capacity. The calculated remaining battery amount can be obtained and displayed. Especially when a battery is installed in a portable personal computer, the battery capacity is automatically reduced to a predetermined voltage (LOW battery voltage, etc.) when the battery deteriorates and the battery capacity decreases, or when a new battery is replaced. Since the correct battery capacity is corrected after correction, it is possible to always display an accurate calculated battery remaining amount.

[Brief description of drawings]

FIG. 1 is a principle configuration diagram of the present invention.

FIG. 2 is a configuration diagram of an embodiment of the present invention.

FIG. 3 is an operation explanatory diagram of the present invention.

FIG. 4 is a flowchart explaining the operation of the present invention.

FIG. 5 is another operation explanatory diagram of the present invention.

FIG. 6 is a flowchart explaining another operation of the present invention.

[Explanation of symbols]

 1: Battery 2: Voltage detection unit 21: Voltage detector 22, 32: A / D conversion unit 23: Timer 3: Current consumption calculation unit 31: Current consumption voltage conversion unit 33: Current consumption integration unit 4: Battery remaining amount calculation Part 5: Battery Remaining Amount Correction Unit 6: Battery Capacity Correction Unit 7: DC-DC Converter

Front page continuation (72) Inventor Shinsuke Shiraki 4-49, Fukami Nishi Yamato City, Kanagawa Prefecture PFU Yamato Factory Co., Ltd. (72) Kiichi Watanabe 4-49 Fukami Nishi, Yamato City, Kanagawa Prefecture Stock Company FU Yamato Factory (72) Inventor Go Morita 4-49 Fukami Nishi 4-chome, Yamato City, Kanagawa Stock Company FU Yamato Factory

Claims (4)

[Claims] 1. A battery remaining amount detecting / correcting method for detecting / correcting a remaining amount of a battery, a current consumption calculating unit (3) for accumulating current consumption supplied from a battery (1) to an apparatus, The remaining battery amount correction unit that corrects the calculated remaining battery amount value at the predetermined voltage obtained from the value accumulated by the current consumption calculating unit (3) according to the actual remaining battery amount of the battery (1) at a plurality of predetermined voltages. (5), and the cumulative value of the consumption current calculated by the consumption current calculation unit (3) is subtracted from the battery remaining amount calculation value corrected by the plurality of predetermined voltages by the battery remaining amount correction unit (5). Battery residual amount detection characterized by being configured to display the calculated battery residual amount
Correction method. 2. The battery remaining amount detection / correction method according to claim 1, wherein the plurality of predetermined voltages are a full charge voltage of the battery (1), a LOW battery voltage, and a dead battery voltage. 3. A battery remaining amount detecting / correcting method for detecting / correcting a remaining amount of a battery, a current consumption calculating unit (3) for accumulating current consumption supplied from a battery (1) to an apparatus, Correct the battery capacity by calculating the difference between the actual remaining battery level at the specified voltage of the battery (1) and the calculated remaining battery level at the specified voltage accumulated by the consumption current calculation unit (3). A battery capacity correcting unit (6) for correcting the battery capacity by the battery capacity correcting unit (6), storing the battery capacity, and calculating the consumption current calculated by the consumption current calculating unit (3) from the stored battery capacity. A battery residual amount detection / correction method characterized by being configured to display the calculated battery residual amount value after subtracting the cumulative value. 4. A battery remaining amount detecting / correcting method, wherein the predetermined voltage of the battery (1) according to claim 3 is a LOW battery voltage.