JPH08213059A - Electronic apparatus - Google Patents

Abstract

PURPOSE: To provide an electronic apparatus having a storage battery degradation predicting means. CONSTITUTION: This electronic apparatus is provided with a voltage measuring means 5 to measure voltage of a storage battery 1, a temperature detecting means 3, a timer means 4 to measure the lapse of time and a display means 7, and encloses a degradation quantity predicting means and a drivable voltage judging means in a microcomputer 2. The degradation quantity predicting means predicts a degration quantity of the storage battery 1 from output of the temperature detecting means 3 and output information of the timer means 4, and the drivable voltage judging means judges drivable voltage of an actuator 6 in the electronic apparatus on the basis of predictive information obtained from the degradation quantity predicting means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device configured to be driven by a storage battery as a power source.

[0002]

2. Description of the Related Art Recently, the number of electronic devices equipped with a storage battery such as a lithium-ion battery is increasing, and the number of electronic devices such as a camera having a relatively large power consumption is also increasing.

[0003]

When a storage battery such as a lithium-ion battery is left at a high temperature for a long time, the electrolytic solution inside the battery is vaporized to cause deterioration such as an increase in internal impedance and a decrease in charging capacity. This is already well known.

FIG. 6 shows an example of changes in the drivable amount when the battery is left at a constant voltage for a high temperature. As shown in the figure, when the battery was left in an environment of 40 ° C, the capacity decreased to 75% in 500 hours, and when left in an environment of 60 ° C, the capacity decreased to 75% in 250 hours. I will end up.

When the storage battery deteriorates in this way, for example, when the motor is energized, the voltage drop becomes severe as much as the internal impedance of the storage battery increases, and the time to reach the inoperable voltage becomes shorter. ,as a result,
There is a high risk that the constant time operation of the motor cannot be guaranteed.

Therefore, in a storage battery-equipped device, a means for always accurately monitoring the deterioration of the storage battery, that is, a decrease in capacity is required, but in the conventional storage-battery-equipped electronic device, such means is not provided. The user of the device mistakenly recognizes that the battery is still usable but neglects to charge it, and as a result, the device becomes inoperable while driving the motor or the like. There were times when it happened.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to install a storage battery in which a user can always accurately grasp a change in the state of the storage battery and to prevent the user from failing to charge the storage battery when it is necessary to charge the storage battery. An electronic device is provided. The purpose of the present invention will be described below for each claimed invention.

An object of the invention of claim 1 is, "In an electronic device configured to be driven by a storage battery as a power source, temperature detecting means for detecting the temperature of the environment in which the electronic device is placed, and time. And a deterioration amount predicting unit that predicts a deterioration amount with respect to the temperature of the storage battery from output information of the temperature detecting unit and the time measuring unit, and a drivable voltage judgment that determines a drivable voltage of the electronic device. Means and
And the drivable voltage determining means has a function of changing the determination voltage based on the prediction information obtained from the deterioration amount predicting means. .

An object of the invention of claim 2 is that "in the electronic device having the structure of claim 1, there is provided a display means for displaying based on the prediction information of the deterioration amount prediction means. It is to provide "electronic equipment".

[0010]

In order to solve the above-mentioned problems, the present invention according to claim 1 states, "In an electronic device configured to be driven by a storage battery as a power source, the electronic device is placed. Temperature detecting means for detecting the temperature of the environment in which it is present, time measuring means for measuring time, deterioration amount predicting means for predicting the amount of deterioration with respect to the temperature of the storage battery from output information of the temperature detecting means and the time measuring means, And a drivable voltage determining unit that determines a drivable voltage of the electronic device, the drivable voltage determining unit having a function of changing the determination voltage based on prediction information obtained from the deterioration amount predicting unit. Electronic device.

According to the present invention, deterioration of the storage battery can be predicted by the temperature detecting means, the time measuring means, and the deterioration amount predicting means, and driving of the electronic equipment can be guaranteed by the drivable voltage determining means.

In order to solve the above-mentioned problems, the invention of claim 2 provides: "In the electronic device having the structure of claim 1, there is provided a display means for displaying based on the prediction information of the deterioration amount prediction means. According to the present invention which provides "an electronic device characterized by the above," it is possible to provide an electronic device that allows a user to recognize the deterioration state of the storage battery.

[0013]

Embodiments of the present invention will be described below with reference to FIGS. Although the embodiments described below are examples in which the present invention is applied to a camera, the electronic device of the present invention is not limited to the camera.

<First Embodiment> A first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a schematic diagram of an electrical configuration of a camera constructed by applying the present invention.

In FIG. 1, 1 is a storage battery mounted in the camera, 2 is a microcomputer having a function of controlling all the operations of the camera (hereinafter abbreviated as microcomputer), and 3 is environmental temperature. Temperature detecting means for detecting 4
Is a time measuring means for measuring time, 5 is a voltage measuring means for detecting the voltage of the storage battery 1, 6 is an actuator for driving various mechanisms in the camera, 7 is an LED for displaying a warning display or other display, The display means 8 is an LCD, and 8 is a start switch.

The microcomputer 2 has a judging means for judging the drivable voltage of the storage battery 1 based on the measurement result of the voltage measuring means 5, and a calculating means for judging the deterioration amount of the storage battery 1 and calculating the usable amount. It is built in.

The timekeeping means 4 has a first memory 41 (4) for storing the timekeeping information based on the output information of the temperature detecting means 2.
It has a 0 ° C memory) and a second memory (60 ° C memory).

FIG. 2 is a flow chart showing the operation of the microcomputer 2. The operation of the microcomputer 2 and the operation of the camera will be described below with reference to the figure.

When the storage battery 1 is turned on, the microcomputer 2 starts its operation from START shown in FIG. 2, and first performs the operation of S101.

S101: A count start signal is sent to the clock means 4 to start clocking.

S102: The ambient temperature is detected by the temperature detecting means 3 and the detection information is fetched. S103: Compare the temperature detection information of S102 with a first reference temperature (for example, 40 ° C.), and go to S107 if the detection temperature is lower than the first reference temperature, and go to S104 if the detection temperature is equal to or higher than the first reference temperature. Transition.

S104: The temperature detection information of S102 is set to the second value.
Compared to the reference temperature (for example, 60 ° C) of the
If the detected temperature is lower than the second reference temperature, the process proceeds to S105.

S105: Assuming that the detected temperature is equal to or higher than the first reference temperature and lower than the second reference temperature, the time counting time is added to the first memory 41 incorporated in the time counting means 4.

S106: Assuming that the detected temperature is equal to or higher than the second reference temperature, the time counting time is added to the second memory 42 built in the time counting means 4.

S107: The leaving time for each temperature is recognized from the information in the first memory 41 and the second memory 42, and the predictive calculation of the deterioration amount of the storage battery 1 due to the leaving state is performed.

S108: From the calculation result of S107, the deterioration amount of the storage battery 1 is compared with a first reference amount (for example, 0%). If the deterioration amount is less than or equal to the first reference amount, the process proceeds to S110 and the deterioration amount is the first one. If it is larger than the reference amount, the process proceeds to S109.

S109: The deterioration amount of the storage battery 1 is compared with a second reference amount (for example, 25%) from the calculation result of S107,
If the deterioration amount is less than or equal to the second reference amount, the process proceeds to S111, and if the deterioration amount is greater than the second reference amount, the process proceeds to S112.

S110: Level BC1 (for example, 3.0) that the deterioration amount is equal to or less than the first reference amount among the drivable voltage determination levels BCLVL stored in advance.
V) is set.

S111: A level BC2 (for example, 3.5 V) is set among the pre-stored driveable voltage determination levels BCLVL assuming that the deterioration amount is larger than the first reference amount and equal to or smaller than the second reference amount. .

S112: A level BC3 (for example, 4.0) that the deterioration amount is larger than the second reference amount among the pre-stored drivable voltage determination levels BCLVL.
V) is set.

Note that BC1 to BC3 are set so that BC1 <BC2 <BC3 because the driveable voltage needs to be higher as the deterioration amount is larger.

S113: Whether or not the activation switch 8 is turned on is detected, and if it is turned on, the process proceeds to S114, and if not, the process proceeds to S102.

S114: The voltage VBAT of the storage battery 1 is compared with the drivable voltage determination level BCLVL, and VBAT is B
If CLVL or more, go to S115, VBAT is BCLVL
If smaller, the process proceeds to S116.

S115: Supposing that the voltage of the storage battery 1 can be guaranteed to drive, the actuator 6 is driven to perform the photographing operation, and then the process proceeds to S102.

Since the details of the operation of step S115 are not essential in the present invention, detailed description thereof will be omitted.

S116: Assuming that the voltage of the storage battery 1 cannot be guaranteed to drive, the display means 7 gives a warning of inoperability (for example, LED blinking, LCD battery mark blinking, etc.), and S10
Move to 2.

FIG. 3 is a table showing an example of deterioration amount prediction of the storage battery 1 and drivable voltage determination level setting corresponding to the leaving environment and leaving time of the camera of this embodiment.

The basic concept is "no deterioration if the temperature is less than 40 ° C", "25% deterioration after standing for 500 hours at 40 ° C or more and less than 60 ° C", and 50% deterioration after standing for 500 hours at 60 ° C or more. , And the amount of deterioration is calculated by integrating the standing time at each environmental temperature.

Further, the drivable voltage determination level is set in three stages according to the deterioration amount, "3.0 V if the deterioration amount is less than 25%" and "3. V if the deterioration amount is 25% or more and less than 50%." 5V "and" 4.0V "if the deterioration amount is 50% or more.

As described above, the temperature detecting means and the time measuring means are provided, and the drivable voltage determination level is changed by predicting the deterioration amount of the storage battery which is deteriorated by the environmental temperature.
It becomes possible to guarantee the drive corresponding to the deterioration amount of the storage battery.

In the present embodiment, the judgment temperature and the drivable voltage judgment level are both set to three levels, but the present invention is not limited to this, and more accurate judgment can be made by dividing the judgment temperature into finer levels. You can also

<Embodiment 2> In the above-mentioned embodiment, the electronic device judges the deterioration amount of the storage battery by the temperature detecting means, the time measuring means and the calculating means, and corrects the driving automatically. By allowing the user to recognize the deterioration state of the storage battery, the user can recognize the necessity of replacing the storage battery.

Therefore, in the second embodiment of the present invention, in addition to the first embodiment, a display means for displaying the deterioration state of the storage battery is provided so that the user can recognize the deterioration state of the storage battery.

Since the electrical construction of the camera of this embodiment is the same as that of the first embodiment shown in FIG. 1, its illustration and description will be omitted.
The display means 7 not only displays a warning, but also displays the deterioration amount of the storage battery 1.

FIG. 4 shows the microcomputer 2 of the second embodiment of the present invention.
Is a flowchart showing the operation of the above, and the following operation is performed when the storage battery 1 is turned on.

S201: A count start signal is sent to the clock means 4 to start clocking.

S202: The ambient temperature is detected by the temperature detecting means 3 and the detection information is fetched.

S203: The first is the temperature detection information of S202.
The detected temperature is the first compared to the reference temperature of
If the detected temperature is lower than the reference temperature, the process proceeds to S207, and if the detected temperature is equal to or higher than the first reference temperature, the process proceeds to S204.

S204: The temperature detection information of S202 is set to the second value.
Compared to the reference temperature (for example, 60 ° C) of the
If the detected temperature is lower than the reference temperature, the process proceeds to S205, and if the detected temperature is equal to or higher than the second reference temperature, the process proceeds to S206.

S205: Assuming that the detected temperature is equal to or higher than the first reference temperature and lower than the second reference temperature, the time count time is added to the first memory 41 incorporated in the time count means 4.

S206: Assuming that the detected temperature is equal to or higher than the second reference temperature, the time counting time is added to the second memory 42 built in the time counting means 4.

S207: The leaving time for each temperature is recognized from the information in the first memory 41 and the second memory 42, and the prediction calculation of the deterioration amount of the storage battery 1 due to the leaving state is performed.

S208: From the calculation result of S207, the deterioration amount of the storage battery 1 is compared with a first reference amount (for example, 0%), and if the deterioration amount is less than or equal to the first reference amount, the process proceeds to S210. If it is larger than the reference amount, the process proceeds to S209.

S209: The deterioration amount of the storage battery 1 is compared with the second reference amount (for example, 25%) from the calculation result of S207,
If the deterioration amount is less than or equal to the second reference amount, the process proceeds to S212, and if the deterioration amount is greater than the second reference amount, the process proceeds to S214.

S210: Level BC1 (for example, 3.0) that the deterioration amount is equal to or less than the first reference amount out of the drivable voltage determination level BCLVL stored in advance.
V) is set.

S211: The display means 7 displays that the deterioration amount is equal to or smaller than the first reference amount (for example, the deterioration amount is 0%).

S212: A level BC3 (for example, 3.5 V) is set in which the deterioration amount is greater than the first reference amount and equal to or less than the second reference amount among the pre-stored driveable voltage determination levels BCLVL. .

S213: The display means 7 displays that the deterioration amount is larger than the first reference amount and equal to or smaller than the second reference amount (for example, the deterioration amount is 25%).

S214: A level BC3 (for example, 4.0) that the deterioration amount is larger than the second reference amount among the pre-stored drivable voltage determination levels BCLVL.
V) is set.

S215: The display means 7 displays that the deterioration amount is larger than the second reference amount (for example, the deterioration amount is 50%).

Note that BC1 to BC3 set in S210, S212, and 214 are set so that BC1 <BC2 <BC3 because the drivable voltage needs to be higher as the deterioration amount is larger.

S216: It is detected whether or not the activation switch 8 is turned on, and if so, the process proceeds to S217, and if not, the process proceeds to S202.

S217: The voltage VBAT of the storage battery 1 is compared with the drivable voltage determination level BCLVL, and VBAT is B
If CLVL or more, go to S218, VBAT is BCLVL
If smaller, the process proceeds to S219.

S218: Supposing that the voltage of the storage battery 1 can be guaranteed to drive, the actuator 6 is driven to perform the photographing operation, and then the process proceeds to S202.

Since the details of the operation of step S218 are not essential to the present invention, detailed description thereof will be omitted.

S219: Assuming that the voltage of the storage battery 1 cannot be guaranteed to drive, the display means 7 gives a warning of inoperability (for example, LED blinking, LCD battery mark blinking, etc.), and S20
Move to 2.

FIG. 5 shows the display means 7 of the second embodiment of the present invention.
[1] is an example of LCD segment,
[2] (a) is a display example when the deterioration amount is 0% and the drivable voltage is
(B) is a display example when the deterioration amount is 25% and the drivable voltage is
(C) is a display example when the deterioration amount is 50% and the driving impossible voltage (battery frame display blinks).

As described above, according to the present embodiment, the user can recognize the deterioration state of the storage battery, so that the user can recognize the necessity of replacing the storage battery.

<Correspondence between Invention and Embodiment> The "deterioration amount predicting means" and the "drivable voltage determining means" described in the claims are means configured in the microcomputer 1 in the embodiment.

[0071]

According to the invention of claim 1, deterioration of the storage battery can be accurately predicted by the temperature detecting means, the time measuring means, and the deterioration amount predicting means, and the electronic device is driven by the drivable voltage judging means. Guarantee becomes possible.

According to the second aspect of the present invention, it is possible to provide an electronic device which allows the user to accurately recognize the deterioration state of the storage battery.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an electrical configuration of an electronic device configured by applying the present invention.

FIG. 2 is a flowchart showing the operation of the microcomputer 2 of FIG. 1 in the electronic device of the first embodiment of the present invention.

3 is a diagram showing an example of a storage battery deterioration amount prediction and a drivable voltage determination level set in the electronic device shown in FIG.

FIG. 4 is a flowchart showing the operation of the microcomputer 2 of FIG. 1 in the electronic device of the second embodiment of the present invention.

FIG. 5 is a diagram showing changes in the display state of the display device in the electronic device of the second embodiment of the present invention.

FIG. 6 is a diagram showing a relationship between a change in capacity of a lithium-ion battery, a standing time and a temperature.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Storage battery 2 ... Microcomputer 3 ... Temperature detecting means 4 ... Time measuring means 5 ... Voltage measuring means 6 ... Actuator 7 ... Display means 8 ... Start switch

Claims (2)

[Claims] 1. An electronic device configured to be driven by a storage battery as a power source, including temperature detecting means for detecting a temperature of an environment in which the electronic device is placed, time measuring means for measuring time, and It has a deterioration amount predicting means for predicting a deterioration amount with respect to the temperature of the storage battery from output information of the temperature detecting means and the time measuring means means, and a drivable voltage judging means for judging a drivable voltage of the electronic device. The electronic device is characterized in that the drivable voltage determination means has a function of changing the determination voltage based on prediction information obtained from the deterioration amount prediction means. 2. The electronic device according to claim 1, further comprising display means for performing display based on prediction information of the deterioration amount prediction means.