JP3169867B2 - Battery level detection method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for detecting a remaining battery level of a device driven by a battery, and more particularly to a method and an apparatus for detecting a remaining battery level by obtaining a battery voltage value.

[0002]

2. Description of the Related Art Conventional methods for detecting the remaining amount of a battery include a method of detecting from a discharge current and a use time, a method of detecting from a battery voltage, and a method of detecting from a used power.

Among them, as a conventional example of a method of detecting from a battery voltage as in the present invention, for example, Japanese Patent Laid-Open
There is a battery capacity remaining amount estimating method disclosed in Japanese Unexamined Patent Publication No. -268470. FIG. 4 is a block diagram showing the configuration of the invention according to this publication, which will be described below with reference to FIG.

First, a voltage of a battery 11 is detected by a voltage detecting circuit 12.
Is detected, and the result is input to the computer 13. The computer 13 stores the discharge characteristics of the batteries including at least the types of the batteries 11, and inputs the discharge characteristics to be used from the input unit 14. The computer 13 detects the remaining amount of the battery by comparing the voltage of the battery 11 detected by the voltage detection circuit 12 with the discharge characteristic instructed from the input unit 14, and displays the result on the output display unit 15.

[0005]

In the above-mentioned prior art, the voltage of a battery is detected by a voltage detection circuit, and the detected voltage itself is compared with a discharge characteristic to detect the remaining amount of the battery. . Therefore, due to the deterioration of the voltage detection circuit and the detection error of the battery voltage due to the individual difference, the accuracy of the remaining amount detection deteriorates by the error, and there is a problem that the remaining amount of the battery cannot be accurately detected.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and an apparatus for detecting the remaining amount of a battery, which realizes accurate detection of the remaining amount of the battery by correcting a detection error of a battery voltage by a voltage detection circuit.

[0007]

[0008]

First battery remaining amount detecting method of the Summary of the Invention The present invention performs the voltage value detection test voltage supplied to the voltage detecting circuit for detecting a voltage value of the battery, the test voltage The voltage value of the battery detected by the voltage detection circuit is corrected using the ratio between the voltage value on the specification and the detected test voltage value, and the remaining amount of the battery is detected from the corrected voltage value of the battery. Is performed.

According to a second battery remaining amount detecting method of the present invention, a first step of detecting a voltage value of a test voltage supplied to a voltage detecting circuit for detecting a voltage value of a battery; A second step of detecting a value of the test voltage, a third step of calculating, as a correction coefficient, a ratio between the specified voltage value of the test voltage and the test voltage value detected in the first step, A fourth step of calculating a corrected battery voltage value from the battery voltage value detected in the step and the correction coefficient calculated in the third step; and a fourth step of calculating the corrected battery voltage value. The corrected battery voltage value,
A fifth step of detecting a remaining battery level from a characteristic table of a remaining battery level corresponding to each voltage value of the battery;
And a seventh step of repeating the second to sixth steps each time a predetermined time elapses. .

[0010]

A first battery remaining amount detecting device of the present invention detects a voltage value of a test voltage supplied to a voltage detecting circuit for detecting a voltage value of a battery, and detects a voltage value of the test voltage according to the specification. A function of correcting the voltage value of the battery detected by the voltage detection circuit using the ratio of the detected test voltage value to the detected test voltage value, and detecting the remaining amount of the battery from the corrected battery voltage value. It is characterized by.

In a second battery remaining amount detecting device according to the present invention, a battery whose remaining amount is to be detected and power are supplied from a voltage supply circuit, and a voltage value of the battery and an input from the voltage supply circuit are inputted. A voltage detection circuit for detecting a voltage value of a test voltage; a voltage supply circuit for supplying the test voltage to the voltage detection circuit; a voltage value on the specification of the test voltage; Table is stored in advance, and the ratio between the specified voltage value of the test voltage and the detected test voltage value is calculated as a correction coefficient, and the detected battery voltage value and the correction coefficient A battery voltage correction unit that calculates a corrected battery voltage value, and that detects a remaining battery level from the corrected battery voltage value and the battery voltage value / battery remaining value conversion table; Display showing remaining battery level , Characterized by having a.

A third battery remaining amount detecting device according to the present invention is the second battery remaining amount detecting device according to the present invention, further comprising a timer for counting a predetermined time, and detecting the battery remaining amount at predetermined time intervals. Is repeatedly performed.

According to a fourth remaining battery level detecting device of the present invention, in the second remaining battery level detecting device of the present invention, the voltage supply circuit is supplied with power from the battery.

According to a fifth battery remaining amount detecting device of the present invention, in the second battery remaining amount detecting device of the present invention, the voltage supply circuit is supplied with power from a power source other than the battery. And

[0016]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
A voltage supply circuit 2 for supplying power to the voltage detection circuit 3, a voltage detection circuit 3 for detecting the voltage of the battery 1 and the voltage supplied from the voltage supply circuit 2, It comprises a battery voltage correction section 4 for correcting the voltage to detect the remaining battery level, a display section 5 for displaying the remaining battery level, and a timer 6.

The voltage supply circuit 2 is, for example, a DC / DC converter, and receives power from the battery 1 to supply power to a load (not shown) and a voltage detection circuit 3. Then, the output voltage of the voltage supply circuit 2 is supplied to the voltage detection circuit 3 for correction.

The battery voltage correction unit 4 includes a storage unit 41 and a calculation unit 42. The storage unit 41 stores a specification value of a voltage supplied from the voltage supply circuit 2 to the voltage detection circuit 3,
The corrected battery voltage value / remaining battery value conversion table is stored. The calculation unit 42 corrects the battery voltage detected by the voltage detection circuit 3 and calculates the remaining battery power.

Next, the operation of the embodiment of the present invention will be described in detail with reference to FIGS.

FIG. 2 is a flowchart showing the operation of the embodiment of the present invention, and FIG. 3 is a diagram showing a corrected battery voltage value / battery remaining value conversion table.

First, the voltage detection circuit 3 includes the voltage supply circuit 2
When it is started by being supplied with power from the power supply, the power supply circuit 2 detects a voltage value (detection supply voltage value) supplied from the voltage supply circuit 2. Then, the detected supply voltage value is digitized (1.
0 bit: HEX) and the storage unit 41 of the battery voltage correction unit 4
(Step S1).

Next, the voltage detecting circuit 3 detects the voltage value of the battery 1 (detected battery voltage value) and digitizes the voltage (10 Bi).
t: HEX) and store it in the storage unit 41 (step S
2).

The calculation section 42 of the battery voltage correction section 4 reads out the specification value (specification supply voltage value) of the voltage supplied from the voltage supply circuit 2 stored in the storage section 41 in advance (step S3).

The calculation unit 42 calculates a correction coefficient by the following calculation based on the detected supply voltage value detected and stored in step S1 and the specification supply voltage value read in step S3 (step S4). .

Correction coefficient = Specified supply voltage value ÷ Detected supply voltage value Subsequently, the calculation unit 42 corrects the detected battery voltage value detected and stored in step S2 and the correction coefficient calculated in step S4 by the following calculation. The subsequent battery voltage value is calculated (step S5).

The corrected battery voltage value = the detected battery voltage value × the correction coefficient The calculation unit 42 calculates the corrected battery voltage value calculated in step S 5 and the corrected battery voltage of FIG. The remaining battery value is detected by referring to the voltage value / battery remaining value conversion table (step S6). This battery level is
It is displayed on the display unit 5 (step S7).

Thereafter, the arithmetic unit monitors whether a predetermined time has elapsed by using the timer 6, and when the predetermined time has elapsed, the operation proceeds to step S.
Returning to the operation of step 2, the remaining battery level is detected again. And
Thereafter, the detection of the remaining battery level is repeatedly performed at regular intervals until the battery power is turned off (step S8).

In the above description, it has been described that the voltage supply circuit 2 receives power supply from the battery 1. However, the same effect can be obtained by receiving power supply from a power supply other than the battery 1.

[0030]

As described above, the present invention corrects a battery voltage detection error caused by deterioration or individual difference caused by a voltage detection circuit, so that an accurate battery voltage can be detected. This has the effect that accurate detection of the remaining battery level can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the embodiment of the present invention.

FIG. 3 is a diagram showing a corrected battery voltage value / battery remaining value conversion table.

FIG. 4 is a block diagram showing a configuration of a conventional technique.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 battery 2 voltage supply circuit 3 voltage detection circuit 4 battery voltage correction unit 41 storage unit 42 calculation unit 5 display unit 6 timer

Claims (7)

(57) [Claims] 1. A voltage detection circuit for detecting a voltage value of a test voltage supplied to a voltage detection circuit for detecting a voltage value of a battery, and a ratio between a specified voltage value of the test voltage and the detected test voltage value. And correcting the voltage value of the battery detected by the voltage detection circuit using the voltage detection circuit, and detecting the remaining amount of the battery from the corrected battery voltage value. 2. A first step of detecting a voltage value of a test voltage supplied to a voltage detection circuit for detecting a voltage value of a battery; a second step of detecting a voltage value of the battery; A third step of calculating, as a correction coefficient, a ratio between a voltage value on the specification of the test voltage and the test voltage value detected in the first step; and a voltage value of the battery detected in the second step. A fourth step of calculating a corrected battery voltage value from the correction coefficient calculated in the third step, a corrected battery voltage value calculated in the fourth step, A fifth step of detecting the remaining amount of the battery from the characteristic table of the remaining amount of the battery corresponding to each of the voltage values; a sixth step of displaying the remaining amount of the battery detected in the fifth step; Every time a predetermined time elapses, the second to sixth 7. A method for detecting a remaining battery charge, comprising: a seventh step of repeating steps. 3. A voltage value of a test voltage supplied to a voltage detection circuit for detecting a voltage value of a battery is detected, and a ratio between a specified voltage value of the test voltage and the detected test voltage value is detected. And a function for correcting the voltage value of the battery detected by the voltage detection circuit using the voltage detection circuit, and detecting the remaining amount of the battery from the corrected voltage value of the battery. 4. A battery for which the remaining amount is to be detected, and a voltage detector for supplying power from a voltage supply circuit and detecting a voltage value of the battery and a voltage value of a test voltage input from the voltage supply circuit. Circuit, a voltage supply circuit for supplying the test voltage to the voltage detection circuit, a voltage value on the specification of the test voltage, and a battery voltage value / battery remaining value conversion table are stored in advance, and the test is performed. A ratio between the voltage value on the voltage specification and the detected test voltage value is calculated as a correction coefficient, and a corrected battery voltage value is calculated from the detected battery voltage value and the correction coefficient. A battery voltage correction unit that detects the remaining battery level from the corrected battery voltage value and the battery voltage value / battery remaining value conversion table; and a display unit that displays the detected remaining battery level. , Characterized by having Level detecting unit. 5. A timer for counting a predetermined time.
The detection of the remaining amount of the battery is repeated at predetermined time intervals.
The battery remaining amount detecting device according to claim 4, characterized in that: 6. The power supply circuit according to claim 6 , wherein
5. The device according to claim 4, wherein the battery level is supplied . 7. The voltage supply circuit according to claim 6, wherein the voltage supply circuit includes a battery other than the battery.
The power supply is supplied from a power supply of the power supply.
On- battery level detector.