JP2023148686A - Electronic device and notification method - Google Patents

Abstract

To accurately notify a user of battery exchange timing with a simple configuration.SOLUTION: An electronic device includes a battery, a load circuit that is supplied with power from the battery, and executes predetermined processing at predetermined operation timing, a voltage detection circuit that detects a voltage value of a voltage output from the battery, and a control circuit that is supplied with power from the battery and controls operation of the load circuit. The control circuit calculates an under-operation voltage value which is a voltage value at operation timing, based on a first voltage value which is a voltage value at a first timing previous to the operation timing by a predetermined time, a second voltage value which is a voltage value at a second timing before the operation timing and after a preset first time from the first timing, and a preset correction parameter, and outputs, on the basis of, the under-operation voltage value, alert information indicating that a battery exchange timing has come.SELECTED DRAWING: Figure 3

Description

The present invention relates to an electronic device and a notification method.

It is desirable for devices using primary batteries to be able to notify the user that it is time to replace the battery before the remaining battery capacity decreases and the device becomes inoperable. For example, the device detects the battery voltage, and if the detected battery voltage becomes lower than a set voltage, the device displays information to the user indicating that it is time to replace the battery.

However, batteries have internal resistance, and the larger the current consumption, the lower the voltage. Therefore, even if the voltage output from the battery is higher than the set voltage at no load or light load, if the power consumption at the load is large, the voltage output from the battery may be lower than the voltage at which the device can operate. .

Patent Document 1 describes a technology that includes a temperature detection element and the like and takes various factors into consideration to accurately display the remaining battery capacity. Patent Document 2 describes a technique for calculating the remaining battery power by using a voltage drop caused by processing of a load section.

Japanese Patent Application Publication No. 2000-012104 JP 2021-163597 Publication

The present invention has been made in view of the above, and it is an object of the present invention to provide an electronic device and a notification method that can accurately notify that it is time to replace the battery with a simple configuration. .

In order to solve the above problems and achieve the objects, an electronic device according to the present invention includes: a battery; a load circuit that is supplied with power from the battery and executes a predetermined process at a predetermined operation timing; a voltage detection circuit that detects the voltage value of the voltage output from the battery; and a control circuit that is supplied with power from the battery and controls the operation of the load circuit, and the control circuit is configured to detect the voltage value in advance from the operation timing. a first voltage value that is the voltage value at a first timing before a predetermined time; and a second voltage value at a second timing before the operation timing and after a preset first time from the first timing. An operating voltage value, which is the voltage value at the operating timing, is calculated based on a second voltage value, which is the second voltage value, and a preset correction parameter, and it is determined that it is time to replace the battery based on the operating voltage value. Outputs alert information indicating that something has happened.

According to the present invention, it is possible to accurately notify that it is time to replace the battery with a simple configuration.

FIG. 1 is a diagram showing a position detection system. FIG. 2 is a diagram illustrating an example of a signal transmitted from the electronic device according to the embodiment. FIG. 3 is a diagram showing the configuration of the electronic device according to the embodiment. FIG. 4 is a flowchart showing the flow of processing in the electronic device according to the embodiment. FIG. 5 is a flowchart showing the flow of alert display processing by the control circuit. FIG. 6 is a waveform diagram of the voltage output from the battery and the current output from the battery when transmitting a signal wirelessly. FIG. 7 is a graph showing the relationship between the used capacity of the battery and the voltage value when the battery is under no load. FIG. 8 is a graph showing the relationship between the operating voltage value calculated in the electronic device according to the embodiment and the used capacity of the battery.

Hereinafter, an electronic device 20 according to an embodiment will be described with reference to the drawings.

FIG. 1 is a diagram showing a position detection system 10 including an electronic device 20 according to an embodiment. The position detection system 10 includes an electronic device 20, a plurality of fixed receiving devices 22, and an information processing device 24.

The electronic device 20 is a device that operates using power from a primary battery or a secondary battery that can be replaced by a user. In the present embodiment, the electronic device 20 is a wireless transmitter that periodically wirelessly transmits a signal including identification information that identifies itself using radio waves. Thereby, the electronic device 20 can periodically broadcast the identification information to surrounding devices. The electronic device 20 wirelessly communicates signals using a wireless communication method such as Wi-Fi (registered trademark) or BLE (Bluetooth Low Energy) (Bluetooth is a registered trademark).

The electronic device 20 is held by, for example, a user. For example, the user holds the electronic device 20 by wearing a neck strap to which the electronic device 20 is attached.

The plurality of fixed receiving devices 22 are arranged at different predetermined positions indoors, underground, or the like. For example, each of the plurality of fixed receiving devices 22 receives a signal transmitted from the electronic device 20, and acquires identification information included in the signal and radio wave intensity of the signal. Note that the plurality of fixed receiving devices 22 may be placed at different predetermined positions outdoors.

The information processing device 24 is connected to a plurality of fixed receiving devices 22 via a network. The information processing device 24 acquires the identification information and the radio wave intensity of the signal including the identification information from each of the plurality of fixed receiving devices 22. The information processing device 24 determines the signal received by each of the plurality of fixed receivers 22 based on the position of each of the plurality of fixed receivers 22 and the radio wave intensity of the signal received by each of the plurality of fixed receivers 22. The position of the electronic device 20 identified by the included identification information is calculated. Thereby, the information processing device 24 can detect the position of the user holding the electronic device 20.

FIG. 2 is a diagram illustrating an example of a signal transmitted from the electronic device 20 according to the embodiment. For example, as shown in FIG. 2, the electronic device 20 wirelessly transmits a signal including identification information at predetermined intervals using radio waves with a predetermined constant power. Therefore, the electronic device 20 consumes a certain amount of power for wireless transmission at a predetermined time.

Note that the electronic device 20 is not limited to a wireless transmitter, but may be any other device as long as it operates using power from a primary battery or a secondary battery and executes processing that consumes a certain amount of power at a predetermined operation timing. It may be a device.

FIG. 3 is a diagram showing the configuration of the electronic device 20 according to the embodiment.

The electronic device 20 includes a battery 32, a transmission circuit 34, a light load circuit 36, a switch 38, a voltage detection circuit 40, a display device 42, a volatile memory 46, a nonvolatile memory 48, and a control circuit 50. Be prepared.

The battery 32 is, for example, a primary battery. The battery 32 is, for example, a lithium ion battery. Battery 32 is replaceable by the user. Note that the battery 32 may be a secondary battery, or may be a primary battery or a secondary battery other than a lithium ion battery, as long as it is replaceable by the user. The battery 32 supplies DC power to each circuit within the electronic device 20.

The transmitting circuit 34 is an example of a load circuit, and is supplied with power from the battery 32. The transmitting circuit 34 executes predetermined processing at predetermined operation timing. The transmitting circuit 34 consumes predetermined power by executing predetermined processing. In this embodiment, the transmitting circuit 34 executes a predetermined process at regular intervals. In the present embodiment, as a predetermined process, the transmitting circuit 34 wirelessly transmits a signal including identification information using radio waves with a predetermined constant power.

Light load circuit 36 is supplied with power from battery 32 . The light load circuit 36 consumes a smaller current than the current consumed by the transmission circuit 34, which is a load circuit, during operation. For example, light load circuit 36 may be a fixed resistor. For example, the light load circuit 36 may be a constant current circuit.

The switch 38 switches whether or not to supply power from the battery 32 to the light load circuit 36 under the control of the control circuit 50 . For example, the switch 38 short-circuits between the positive terminal of the battery 32 and the light load circuit 36 under the control of the control circuit 50 . This causes the switch 38 to supply power from the battery 32 to the light load circuit 36 . Further, the switch 38 disconnects the positive terminal of the battery 32 from the light load circuit 36 under the control of the control circuit 50 . As a result, the switch 38 stops supplying power from the battery 32 to the light load circuit 36.

The voltage detection circuit 40 detects the voltage value of the voltage output from the battery 32 at a timing specified by the control circuit 50. The voltage detection circuit 40 provides the detected voltage value to the control circuit 50. The voltage detection circuit 40 may store the detected voltage value in the nonvolatile memory 48.

The display device 42 displays information to the user under the control of the control circuit 50. In this embodiment, the display device 42 displays alert information indicating that it is time to replace the battery 32 under the control of the control circuit 50. The display device 42 may be a display panel such as a liquid crystal, or may be an LED (Light Emitting Diode) that emits light indicating alert information.

The volatile memory 46 is, for example, RAM (Random Access Memory). The volatile memory 46 functions as a work area for processing by the control circuit 50.

The nonvolatile memory 48 is, for example, a ROM (Read Only Memory). The nonvolatile memory 48 stores programs executed by the control circuit 50 and parameters used by the processing of the control circuit 50.

The control circuit 50 is a processor such as a CPU (Central Processing Unit) that operates according to a program stored in the nonvolatile memory 48 in advance. Control circuit 50 controls the operation of transmitting circuit 34 and display device 42 . Further, the control circuit 50 controls the timing at which the voltage detection circuit 40 detects the voltage value. Further, the control circuit 50 acquires the voltage value detected by the voltage detection circuit 40 from the voltage detection circuit 40. Further, the control circuit 50 controls switching of the switch 38.

The control circuit 50 controls and manages the operation timing of a predetermined process executed in the transmission circuit 34. In the present embodiment, the control circuit 50 controls and manages the operation timing of the process of wirelessly transmitting a signal including identification information using constant power, which is executed in the transmitting circuit 34 . For example, the control circuit 50 executes a transmission program module, for example, before the operation timing at which the transmission circuit 34 transmits a signal including identification information, causes the transmission circuit 34 to start preparation for transmission, and transmits the signal wirelessly at the operation timing. Let it be sent.

Further, the control circuit 50 causes the voltage detection circuit 40 to detect the voltage value of the battery 32 at a first timing that is a predetermined time before the operation timing. Then, the control circuit 50 obtains a first voltage value that is the voltage value of the battery 32 at the first timing. The first timing is, for example, a timing before the transmitting circuit 34 starts preparation for transmitting a signal.

Further, the control circuit 50 causes the voltage detection circuit 40 to detect the voltage value of the battery 32 at a second timing, which is before the operation timing and after a preset first time from the first timing. Then, the control circuit 50 obtains a second voltage value that is the voltage value of the battery 32 at the second timing.

Furthermore, the control circuit 50 controls the switch 38 to turn it off before the first timing, and stops the supply of power from the battery 32 to the light load circuit 36 at the first timing. Thereby, the control circuit 50 can obtain, as the first voltage value, the voltage value of the voltage output from the battery 32 in a state where the light load circuit 36 is not consuming power.

Further, the control circuit 50 controls the switch 38 to be in a short-circuit state after the first timing and before the second timing, and causes the battery 32 to supply power to the light load circuit 36 at the second timing. Thereby, the control circuit 50 can obtain, as the second voltage value, the voltage value of the voltage output from the battery 32 in a state where the light load circuit 36 is consuming power.

Further, the control circuit 50 calculates an operating voltage value, which is the voltage value of the battery 32 at the operating timing, based on the first voltage value, the second voltage value, and a preset correction parameter. The correction parameters are stored in the nonvolatile memory 48 in advance. Note that details of a specific method for calculating the operating voltage value will be described later with reference to FIG. 6. Further, the control circuit 50 may estimate the remaining capacity of the power stored in the battery 32 based on the operating voltage value.

Then, the control circuit 50 outputs alert information indicating that it is time to replace the battery 32 based on the operating voltage value to the display device 42, and causes the display device 42 to display the alert information. For example, the control circuit 50 compares the operating voltage value with a preset threshold voltage value, and outputs alert information if the operating voltage value is lower than the threshold voltage value. Note that when the remaining capacity of the electric power stored in the battery 32 is estimated, the control circuit 50 compares the estimated remaining capacity with a preset threshold remaining capacity, and determines whether the estimated remaining capacity is less than the threshold remaining capacity. If the number is low, alert information may be output.

FIG. 4 is a flowchart showing the flow of processing in the electronic device 20 according to the embodiment.

The electronic device 20 executes the processes from S12 to S18 at predetermined intervals (loop process between S11 and S19). For example, the electronic device 20 executes the processes from S12 to S18 at every transmission interval for transmitting a signal including identification information. Note that the electronic device 20 may not execute the processes from S12 to S17 of S12 to S18. For example, the electronic device 20 may execute the processes from S12 to S17 m times (m is an integer smaller than n, equal to or greater than n) every time this flow is executed n times (n is an integer greater than or equal to 2). .

First, in S12, the control circuit 50 determines whether the first timing has arrived. The first timing is a predetermined time before the next operation timing of the transmitting circuit 34, that is, the next timing at which the transmitting circuit 34 transmits a signal. If the first timing has not come (No in S12), the control circuit 50 waits for processing in S12. When the first timing has come (Yes in S12), the control circuit 50 advances the process to S13.

In S13, the control circuit 50 causes the voltage detection circuit 40 to detect a voltage value. Note that at the first timing, the switch 38 is in the disconnected state. Therefore, the voltage detection circuit 40 detects a first voltage value that is the voltage value of the voltage output from the battery 32 when power is not being supplied from the battery 32 to the light load circuit 36 at the first timing. To detect. The control circuit 50 receives the first voltage value from the voltage detection circuit 40 and stores it in the volatile memory 46, for example.

Subsequently, in S<b>14 , the control circuit 50 controls the switch 38 to short-circuit the switch 38 to supply power from the battery 32 to the light load circuit 36 .

Subsequently, in S15, the control circuit 50 determines whether or not the second timing has arrived. The second timing is a time before the next operation timing of the transmitting circuit 34 and after a preset first time from the first timing. If the second timing has not come (No in S15), the control circuit 50 waits for processing in S15. When the second timing has come (Yes in S15), the control circuit 50 advances the process to S16.

In S16, the control circuit 50 causes the voltage detection circuit 40 to detect a voltage value. Note that at the second timing, the switch 38 is in a short-circuited state. Therefore, the voltage detection circuit 40 detects a second voltage value that is the voltage value of the voltage output from the battery 32 when power is being supplied from the battery 32 to the light load circuit 36 at the second timing. To detect. The control circuit 50 receives the second voltage value from the voltage detection circuit 40 and stores it in the volatile memory 46, for example.

Subsequently, in S17, the control circuit 50 controls the switch 38 to turn it off, thereby stopping the power supply from the battery 32 to the light load circuit 36.

Subsequently, in S18, the transmitting circuit 34 wirelessly transmits a signal including the identification information with a predetermined power at a preset operation timing.

The electronic device 20 repeats the above process at predetermined time intervals. Thereby, the electronic device 20 can transmit a signal including identification information at predetermined time intervals. Further, the electronic device 20 can detect a first voltage value that is the voltage value of the battery 32 at the first timing and a second voltage value that is the voltage value of the battery 32 at the second timing. Note that the control circuit 50 may perform the process of S17 after S18 and before S12 in the next loop.

FIG. 5 is a flowchart showing the flow of alert display processing by the control circuit 50.

The control circuit 50 performs processing according to the flow shown in FIG. 5, for example, periodically or when receiving an instruction from a user or the like.

First, in S31, the control circuit 50 reads the most recently detected first voltage value and second voltage value from the volatile memory 46. Subsequently, in S32, the control circuit 50 reads preset correction parameters from the nonvolatile memory 48.

Subsequently, in S33, the control circuit 50 calculates the operating voltage value, which is the voltage value of the voltage output from the battery 32 at the operating timing, based on the first voltage value, the second voltage value, and the correction parameter. Note that details of a specific method for calculating the operating voltage value will be described later with reference to FIG. 6.

Subsequently, in S34, the control circuit 50 estimates the remaining capacity of the power stored in the battery 32 based on the operating voltage value. For example, the control circuit 50 estimates the remaining capacity based on the operating voltage value using a table or function that indicates the correspondence between the operating voltage value and the remaining capacity that is set in advance. Note that the control circuit 50 does not need to execute the process of S34.

Subsequently, in S35, the control circuit 50 compares the operating voltage value with a preset threshold voltage value and determines whether the operating voltage value is lower than the threshold voltage value. If the operating voltage value is not lower than the threshold voltage value, that is, if the operating voltage value is equal to or greater than the threshold voltage value (No in S35), the control circuit 50 ends this flow. If the operating voltage value is lower than the threshold voltage value (Yes in S35), the control circuit 50 advances the process to S36.

Note that the control circuit 50 may compare the estimated remaining capacity and a preset threshold remaining capacity to determine whether the remaining capacity is lower than the threshold remaining capacity. Then, if the remaining capacity is not lower than the threshold remaining capacity, that is, if the remaining capacity is greater than or equal to the threshold remaining capacity (No in S35), the control circuit 50 ends this flow. If the remaining capacity is lower than the threshold remaining capacity (Yes in S35), the control circuit 50 advances the process to S36.

In S36, the control circuit 50 causes the display device 42 to display alert information indicating that it is time to replace the battery 32. For example, the control circuit 50 may cause the display device 42 to display characters or symbols indicating that it is time to replace the battery 32 as alert information. For example, the control circuit 50 may display an LED of a color indicating that it is time to replace the battery 32 as alert information. Further, the control circuit 50 may output a sound indicating that it is time to replace the battery 32 while displaying the alert information, or instead of displaying the alert information. When the control circuit 50 finishes the process of S36, it ends this flow.

FIG. 6 is a waveform diagram of the voltage output from the battery 32 and the current output from the battery 32 when transmitting a signal wirelessly.

The transmitting circuit 34 starts consuming current for preparatory operation for signal transmission a predetermined time before the operation timing. Therefore, as shown in FIG. 6, the current output from the battery 32 increases as time passes from a predetermined time before the operation timing. Further, the current output from the battery 32 reaches a peak at the operating timing, and after reaching the peak at the operating timing, decreases as time passes.

Further, the voltage output from the battery 32 decreases as the current increases, and increases as the current decreases. Therefore, as shown in FIG. 6, the voltage output from the battery 32 decreases over time from a predetermined time before the operation timing, and reaches the lowest voltage at the operation timing. Then, the voltage output from the battery 32 reaches the lowest voltage at the operation timing, and then increases as time passes.

The first timing is a predetermined time before the operation timing. Since the control circuit 50 manages the operation timing, it is possible to specify the first timing. Further, the first timing is preferably a time when there is no influence of current consumption for signal transmission by the transmitting circuit 34. Therefore, the first timing is preferably a time before the transmitting circuit 34 starts the preparation operation for signal transmission.

The second timing is before the operation timing and is a predetermined first time after the first timing. The control circuit 50 can identify the second timing by counting the passage of time from the first timing.

Further, the second timing is the time after the transmitting circuit 34 starts the preparation operation for signal transmission. The control circuit 50 controls the switch 38 to stop supplying power from the battery 32 to the light load circuit 36 at the first timing. The control circuit 50 controls the switch 38 to supply power from the battery 32 to the light load circuit 36 after the first timing and before the second timing. Therefore, the voltage of the battery 32 at the second timing is lower than the voltage of the battery 32 at the first timing.

Here, since the transmitting circuit 34 transmits a signal with constant power, the profile of the current consumed for signal transmission by the transmitting circuit 34 does not change each time a signal is transmitted, and is constant. Further, the power consumption of the light load circuit 36 changes depending on the temperature when the light load circuit 36 is a fixed resistance or constant current circuit. However, since the power consumption of the light load circuit 36 changes with temperature in the same way as the temperature of the voltage generated from the battery 32 changes, the power consumption of the light load circuit 36 changes so that the influence of the temperature change is canceled out. Therefore, the relative voltage relationship between the voltage value of the battery 32 at the first timing, the voltage value of the battery 32 at the second timing, and the voltage value of the battery 32 at the operation timing is estimated to be constant. From this, the control circuit 50 sets the first voltage value that is the voltage value of the battery 32 at the first timing, the second voltage value that is the voltage value of the battery 32 at the second timing, and the preset correction parameter. Based on this, an operating voltage value, which is the voltage value of the battery 32 at the operating timing, can be calculated.

For example, when the first voltage value is A, the second voltage value is B, the operating voltage value is C, and the correction parameter is p, the control circuit 50 calculates the operating voltage value using equation (1). .
C=A-{p×(AB)}...(1)

That is, the control circuit 50 subtracts the difference value obtained by subtracting the second voltage value from the first voltage value multiplied by the correction parameter, {p×(AB)}, from the first voltage value (A). is calculated as the operating voltage value.

Here, the correction parameters are set, for example, at the time of design or factory shipment. For example, a designer etc. may determine the current value of the current output from the battery 32 at the first timing, the current value of the current output from the battery 32 at the second timing, and the current value of the current output from the battery 32 at the operation timing. Acquire the current value by simulation or measurement. Then, the current value of the current output from the battery 32 at the first timing is a, the current value of the current output from the battery 32 at the second timing is b, and the current value of the current output from the battery 32 at the operation timing. When the value is c, the designer or the like calculates the correction parameter p using equation (2).
p=c/(ba-a)...(2)

The designer then stores the correction parameters calculated in this way in the nonvolatile memory 48 of the electronic device 20.

FIG. 7 shows the usage capacity of the battery 32 and the voltage of the battery 32 under no load when each of the five batteries 32 is attached to the electronic device 20 and a signal is transmitted every second at 25°C. It is a figure showing a relationship.

The voltage of the battery 32 under no load decreases by a small amount and remains almost constant until a predetermined usage capacity is reached. Then, the voltage of the battery 32 under no load sharply decreases when the predetermined usage capacity is exceeded. Therefore, even if the control circuit 50 detects the voltage of the battery 32 under no load, it remains constant up to a predetermined usage capacity, so it is possible to detect the time to replace the battery 32 before the remaining capacity of the battery 32 runs out. is extremely difficult.

FIG. 8 shows the used capacity of the battery 32 and the calculated capacity in the electronic device 20 according to the embodiment when each of the five batteries 32 is attached to the electronic device 20 and a signal is transmitted every second at 25° C. FIG.

The operating voltage calculated by the electronic device 20 according to the embodiment decreases relatively linearly as the used capacity increases, and sharply decreases after a certain used capacity is exceeded. Therefore, the control circuit 50 can calculate the operating voltage and accurately estimate the used capacity based on the calculated operating voltage. Therefore, by comparing the calculated operating voltage with a preset threshold voltage, the control circuit 50 can accurately detect the time to replace the battery 32 before the remaining capacity of the battery 32 runs out. can. Furthermore, the control circuit 50 calculates the remaining capacity of the battery 32 from the calculated operating voltage based on, for example, a preset table or function, and compares the calculated remaining capacity with a preset threshold remaining capacity. The time to replace the battery 32 can be detected before the remaining capacity of the battery 32 runs out.

Further, the operating voltage calculated by the electronic device 20 according to the embodiment is a first voltage value at a first timing where there is no influence of power consumption by the transmitting circuit 34, and a second voltage value at a first timing when power is consumed by the light load circuit 36. It is estimated based on the second voltage value at the timing. The power consumption of the light load circuit 36 varies such that the effects of temperature changes on the voltage of the battery 32 are canceled out. Thereby, the control circuit 50 can accurately calculate the operating voltage regardless of temperature changes, and can accurately detect the time to replace the battery 32 before the remaining capacity of the battery 32 is exhausted.

As described above, according to the electronic device 20 according to the present embodiment, it is possible to accurately notify the user that it is time to replace the battery 32 with a simple configuration.

Although the embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. Embodiments can be modified in various ways.

20 Electronic equipment 32 Battery 34 Transmission circuit 36 Light load circuit 38 Switch 40 Voltage detection circuit 42 Display device 46 Volatile memory 48 Non-volatile memory 50 Control circuit

Claims (10)

battery and
a load circuit that is supplied with power from the battery and executes a predetermined process at a predetermined operation timing;
a voltage detection circuit that detects the voltage value of the voltage output from the battery;
a control circuit that is supplied with power from the battery and controls the operation of the load circuit;
Equipped with
The control circuit includes:
a first voltage value that is the voltage value at a first timing that is a predetermined time before the operation timing; and a second voltage value that is the voltage value at a first timing that is a predetermined time before the operation timing; Calculating an operating voltage value, which is the voltage value at the operating timing, based on a second voltage value, which is the voltage value at the timing, and a preset correction parameter;
An electronic device that outputs alert information indicating that it is time to replace the battery based on the operating voltage value. further comprising a display device;
The electronic device according to claim 1, wherein the control circuit displays the alert information on the display device. a light load circuit that is powered by the battery and consumes less current than the load circuit;
a switch that switches whether or not to supply power from the battery to the light load circuit under control by the control circuit;
Equipped with
The control circuit includes:
controlling the switch to stop supplying power from the battery to the light load circuit at the first timing;
The electronic device according to claim 1, wherein the switch is controlled to supply power from the battery to the light load circuit at the second timing. The electronic device according to claim 1, wherein the control circuit outputs the alert information when the operating voltage value is lower than a preset threshold voltage value. The control circuit estimates the remaining capacity of the electric power stored in the battery based on the operating voltage value, and outputs the alert information if the estimated remaining capacity is less than a preset threshold remaining capacity. The electronic device according to claim 1. When the first voltage value is A, the second voltage value is B, the operating voltage value is C, and the correction parameter is p, the control circuit calculates the operating voltage value using equation (1). Calculate C=A-{p×(AB)}...(1)
The electronic device according to claim 1. The electronic device according to claim 1, wherein the load circuit periodically executes the predetermined process. The electronic device according to claim 1, wherein the load circuit periodically wirelessly transmits a signal including identification information for identifying itself using radio waves with a predetermined constant power. The electronic device according to claim 1, wherein the battery is a primary battery. A notification method for notifying the time to replace the battery in an electronic device including a battery and a load circuit that is supplied with power from the battery and executes a predetermined process at a predetermined operation timing, the method comprising:
detecting a first voltage value that is a voltage value of the voltage output from the battery at a first timing that is a predetermined time before the operation timing;
detecting a second voltage value that is a voltage value of the voltage output from the battery at a second timing that is before the operation timing and a first time after the first timing;
Calculating an operating voltage value that is a voltage value of the battery at the operating timing based on the first voltage value, the second voltage value, and a preset correction parameter;
A notification method that outputs alert information indicating when to replace the battery based on the operating voltage value.

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