Electronic apparatus and control method thereof and program

Abstract

To provide an electronic apparatus that can reduce the occurrence of a problem due to low residual quantity in a battery when connected to a power supply apparatus to receive power supply.SOLUTION: An electronic apparatus according to the present disclosure has acquisition means for acquiring information on a residual quantity in a battery that supplies power for operating an electronic apparatus, detection means for detecting a connection of a power supply apparatus that supplies power to the electronic apparatus, control means for controlling the power supply apparatus to supply power to the electronic apparatus instead of the battery when a connection of the power supply apparatus is detected, and display control means for displaying a warning on the remaining amount of power in the battery on display means when the electronic apparatus is operating on battery power and a residual quantity in a battery is below a predetermined threshold. The display control means makes the display means display a warning about the residual quantity in the battery when the connection of the power supply apparatus is detected and the residual quantity in the battery is below a second threshold that is different from the predetermined threshold.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an electronic device, a control method thereof, and a program. [Background technology]

[0002] Some devices that use battery power for filming display the remaining time of the device using numerical values, a level meter, etc. For professional video cameras, a power outage during filming can lead to filming being interrupted or having to be restarted, so it is useful to display a warning (in addition to a level meter, etc.) when the battery level is low.

[0003] In portable devices, a technology is known that lights up an LED to warn when the battery output voltage detected by a voltage detection circuit falls below a threshold (Patent Document 1).In addition, because the chargeable capacity of a rechargeable battery decreases with age, a technology is known that corrects the threshold value according to the deterioration state to reduce errors in the usable time and issue a warning (Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 11-111347 [Patent Document 2] JP 2009-250953 A Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, with the spread of a power supply standard called Universal Serial Bus (USB) Power Delivery (PD), the number of devices that can receive power from a power supply device compatible with a USB Type-C terminal is increasing. Some of these devices can receive power from a power supply device via a USB Type-C cable while a removable battery is attached. In such a case, if the cable is unintentionally removed when the removable battery is low on power, the device may shut down in a short time due to the lack of remaining battery power.

[0006] The present invention has been made in consideration of the above-mentioned problems, and its purpose is to realize a technology that can reduce the occurrence of problems caused by a decrease in battery remaining capacity when a power supply device is connected to receive power supply. [Means for solving the problem]

[0007] In order to solve this problem, for example, an electronic device of the present invention has the following configuration: That is, the electronic device has an acquisition means for acquiring information on a remaining charge of a battery from a battery that supplies power for the electronic device to operate, a detection means for detecting a connection of a power supply device that supplies power to the electronic device, a control means for controlling the power supply device to supply power to the electronic device instead of the battery when the connection of the power supply device is detected, and a display control means for causing a display means to display a warning regarding the remaining charge of the battery in response to the remaining charge of the battery being equal to or less than a predetermined threshold when the electronic device operates on power from the battery, the display control means being characterized in that, when the connection of the power supply device is detected, the display means displays a warning regarding the remaining charge of the battery in response to the remaining charge of the battery being equal to or less than a second threshold different from the predetermined threshold. Effect of the Invention

[0008] According to the present invention, when a power supply device is connected to receive power, it is possible to reduce the occurrence of problems caused by a decrease in the remaining battery charge. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a block diagram showing an example of the configuration of a system according to a first embodiment. [Diagram 2] FIG. 1 is a block diagram showing an example of the configuration of a main unit according to a first embodiment. [Figure 3A] FIG. 13 is a diagram showing an example of a display screen showing a power state in the first embodiment. [Figure 3B] FIG. 13 is a diagram showing an example of a display screen for a warning notification in the first embodiment. [Figure 4] 1 is a flowchart showing a series of operations related to the control of a warning display in the first embodiment. [Diagram 5] FIG. 11 is a block diagram showing an example of the configuration of a main unit according to a second embodiment. [Figure 6] 11 is a flowchart showing a series of operations related to the control of a warning display in the second embodiment. [Figure 7] Example of a warning notification display screen in the second embodiment DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] (Embodiment 1) Hereinafter, the embodiments will be described in detail with reference to the attached drawings. Note that the following embodiments do not limit the invention according to the claims. Although the embodiments describe a number of features, not all of these features are essential to the invention, and the features may be combined in any manner. Furthermore, in the attached drawings, the same reference numbers are used for the same or similar configurations, and duplicated descriptions are omitted.

[0011] In the following, a case where a professional video camera capable of mounting a battery and receiving power from an external source is used as an example of an electronic device will be described. However, this embodiment can be applied to a playback device, regardless of whether it is for professional use or not, and not limited to a recording device such as a video camera. Furthermore, this embodiment can be applied to other electronic devices capable of mounting a battery and receiving power from an external source. These electronic devices may include, in addition to video cameras, digital cameras, smartphones, tablet terminals, notebook computers, game devices, wearable devices, and the like.

[0012] <Charging system configuration> Fig. 1 shows an example of the configuration of a charging system including a digital camera according to this embodiment. One or more of the functional blocks shown in Fig. 1 may be realized by hardware such as an ASIC, or may be realized by a programmable processor such as a CPU or GPU executing software. Alternatively, they may be realized by a combination of software and hardware.

[0013] The charging system according to the present embodiment includes, as an example, a removable battery 100, a main device 120 which is a digital camera, and a power supply device 130 which complies with the Universal Serial Bus (USB) Type-C. The removable battery 100 includes a battery cell 101 and generates an electromotive force. The removable battery 100 attached to the main device 120 supplies power for the main device 120 to operate. The protection IC 102 controls a protection function for the battery cell during charging and discharging. The voltage detection unit 103 detects the battery voltage, and the detection resistor 104 detects the current. The temperature sensor 105 may be, for example, a thermistor or a thermocouple, and measures the temperature in the vicinity and outputs temperature information. Signals from the voltage detection unit 103, the detection resistor 104, and the temperature sensor 105 are supplied to a microcomputer 106 in the battery.

[0014] The information processor 106a of the battery microcomputer 106 performs A / D conversion and current integration on the supplied signal. The removable battery 100 may further include an LED (not shown) that indicates the remaining battery charge. This LED display can be controlled by the battery microcomputer 106, for example.

[0015] The main device 120 is connected to the removable battery 100 via contacts 107 and 108. The main device 120 receives power from the removable battery 100 via contacts 107 and 108. A power supply control unit 124 of the main device 120 generates a required voltage based on the supplied power and drives each unit of the main device 120. The power supply control unit 124 may include, for example, a DC / DC converter and a linear regulator.

[0016] The microcomputer 125 of the main device 120 includes a CPU, ROM, RAM, etc., as described below, and controls each part of the main device 120. The microcomputer 125 transmits a request command to the internal battery microcomputer 106 of the removable battery 100, and receives information such as the remaining battery capacity, the battery voltage, and the battery current from the internal battery microcomputer 106 as response data.

[0017] The microcomputer 125 can use the information in the received response data to calculate, for example, the available time. The microcomputer 125 displays the calculated available time on a display unit 121 such as a liquid crystal display. The microcomputer 125 also controls the entire main device in response to input information from an operation unit 122 provided in the main device 120. The display unit 121 includes, for example, a display panel, and displays images and a graphical user interface in response to instructions from the microcomputer 125. The operation unit 122 is composed of, for example, switches, buttons, a touch panel, and the like, and provides the microcomputer 125 with input user operations.

[0018] The power source switching circuit 123 switches the power supply source between the removable battery 100 and the power supply device 130. For example, when the power supply device 130 is connected while the removable battery 100 is attached, the power source switching circuit 123 switches the power supply source from the removable battery 100 to the power supply device 130. In other words, the power source switching circuit 123 controls so that the power of the power supply device 130 is supplied to the main device 120 instead of the removable battery 100.

[0019] The power supply device 130 is connected to the main device 120 via contacts 134, 135 and a USB Type-C interface cable, and supplies power to the main device 120. The power supply device 130 includes a microcomputer 131, a power supply circuit 132 for supplying VBUS, and a CC communication circuit 133. The CC communication circuit 133 performs bidirectional data communication with the CC communication circuit 126 on the main device 120 side, and detects the connection between the power supply device 130 and the main device 120 and obtains voltage / current information. For example, the connection of the power supply device 130 is detected by communication with the main device 120 based on the USB PD (Power Delivery) standard.

[0020] The USB Type-C interface cable includes a GND terminal for ground signals, a VBUS terminal for power supply, and a CC (Configuration Channel) terminal, etc. The CC terminal is used for bidirectional data communication (so-called CC communication) such as negotiation with the power supply destination.

[0021] <Main unit configuration> Next, the configuration of main device 120 will be described with reference to Fig. 2. Note that a duplicated description of the configuration described with reference to Fig. 1 will be omitted.

[0022] The microcomputer 125 includes a CPU 228 and controls each block of the microcomputer 125 via a bus (not shown). The CPU 228 may include one or more processors. The CPU 228 loads a computer program stored in a ROM 229 into a RAM 230 and executes the program.

[0023] The ROM 229 may be a non-volatile memory including, for example, a semiconductor memory, and a part of the area of ​​the ROM 229 may be used for backup to hold the state of the system, etc. The RAM 230 is, for example, a volatile memory, and temporarily stores the results of calculations by the CPU 228, etc.

[0024] The communication unit 220 acquires the remaining capacity and battery current of the removable battery 100 through communication with the removable battery 100. The remaining capacity calculation unit 221 calculates the remaining capacity of the removable battery 100 based on the acquired remaining capacity and battery current. The remaining capacity determination unit 222 determines whether the remaining battery capacity calculated by the remaining capacity calculation unit 221 is equal to or less than a specified threshold.

[0025] The CC communication circuit 126 inside the PD controller IC 231 negotiates with the power supply device 130 via a CC (Configuration Channel) terminal of the USB Type-C interface cable. This determines the connection detection between the connected devices, the direction of the power supply, the current / voltage settings, and the like.

[0026] The connection detection unit 223 detects the connection based on the connection information of the power supply device 130 transmitted from the CC communication circuit 126 to the CPU 228. The display switching unit 224 is a block that switches the display related to the power supply, and when the connection of the power supply device 130 is detected, the display of the remaining battery level on the display unit 121 is switched to a display of the connection of the power supply device 130. The threshold switching unit 225 switches a threshold for determining whether or not to display a warning notification related to the remaining battery level according to this embodiment. For example, the threshold switching unit 225 may switch the threshold in response to the detection of the connection of the power supply device 130 by a notification from the connection detection unit 223 or the like.

[0027] The warning display control unit 226 determines whether to switch and display a warning notice based on the determination result of the remaining charge determination unit 222, and causes the display unit 121 to display a warning display according to the determination result. For example, when the main device 120 is operating on power from the removable battery 100, the warning display control unit 226 can cause the display unit 121 to display a first warning regarding the remaining battery charge according to the determination that the remaining battery charge is equal to or lower than a threshold. On the other hand, when the connection of the power supply device 130 is detected and the main device 120 is receiving power from the power supply device, the warning display control unit 226 causes the display unit 121 to display a second warning regarding the remaining battery charge according to the determination that the remaining battery charge is equal to or lower than a threshold.

[0028] Next, a screen display example according to this embodiment will be described with reference to Fig. 3A and Fig. 3B. Fig. 3A(a) shows an example of a screen displayed on the display unit 121 during shooting. In this example, video data acquired by an imaging unit (not shown) included in the main body device 120 is displayed on the entire shooting screen 350, and subjects 301, 302, and 303 are displayed. The video data acquired by the imaging unit is expanded in the RAM 230 and displayed on the display unit 121 by the CPU 228. In addition, the entire shooting screen 350 displays a remaining battery time 304, a recording state 305, a shooting time code 306, and an SD card recordable time 307, all of which are displayed on an on-screen display (OSD). The OSD is expanded in the RAM 230, and the CPU 228 displays the OSD data on the video data acquired from the imaging unit on the display unit 121. In the OSD display of the entire shooting screen 350, the remaining battery time 304 indicates, for example, the remaining time for which shooting is possible according to the remaining battery power of the removable battery 100 attached to the main body device 120.

[0029] Fig. 3A(b) shows an example of a screen displayed on the display unit 121 in a state in which the main device 120 detects a connection to a power supply device (i.e., power supply device 130) that complies with USB Type-C. In this state, the main device 120 switches the OSD display from a state in which the remaining battery time 304 shown in Fig. 3A(a) is displayed to a state in which an external power supply connection display 310 is displayed. The external power supply connection display 310 indicates that the main device 120 is in a state in which it has detected a connection to an external power supply device.

[0030] FIG. 3B(a) shows an example of a screen in which a warning display 320 for encouraging battery replacement is displayed on the display unit 121 by OSD. For example, the CPU 228 displays the warning display 320 when both the removable battery 100 and the power supply device 130 are connected to the main body device 120 and the acquisition result of the remaining charge information of the removable battery 100 is equal to or less than a predetermined threshold value (A1). In the warning display 320, for example, a display such as "There is a possibility of shutdown if the power cable is disconnected because the remaining battery charge is low. We recommend replacing the battery" is displayed on the entire shooting screen 350. In the warning display 320, for example, a message indicating the risk of losing connection with the power supply device and a message for encouraging battery replacement are included. Note that the CPU 228 may further display the remaining battery time or a battery charge gauge when displaying the warning display 320. By visually checking the approximate remaining charge of the battery, the user can intuitively grasp the necessity and urgency of battery replacement.

[0031] 3B(b) shows an example of a screen in which a warning display 330 for encouraging battery replacement is displayed on the display unit 121 by OSD. For example, when the removable battery 100 is connected to the main body device 120 but the connection of the power supply device 130 is not detected and the acquired result of the remaining charge information of the removable battery 100 is equal to or less than a predetermined threshold value (A2), the CPU 228 displays the warning display 330. The warning display 330 includes a message indicating the risk due to a decrease in the remaining battery charge, such as "The remaining battery charge is low and may cause a shutdown. We recommend replacing the battery," and a message for encouraging battery replacement.

[0032] In the present embodiment, the warning display 320 and the warning display 330 each having a written text are displayed. However, the content of the warning display 320 may be expressed by text or by an image such as an icon or a pattern. Furthermore, in addition to or instead of the display on the display unit 121, the CPU 228 may output a sound corresponding to the content of the warning display 320 from a sound output unit (not shown).

[0033] A series of operations relating to the control of the warning display, which are executed by main device 120, will be described with reference to Fig. 4. This series of operations is realized by CPU 228 expanding a computer program stored in ROM 229 into RAM 230, executing it, and causing each part of microcomputer 125 shown in Fig. 2 to function. This series of operations is started, for example, when CPU 228 detects that removable battery 100 is connected to main device 120 and the power switch of main device 120 is ON.

[0034] In S401, the CPU 228 acquires information on the remaining capacity (remaining capacity information) of the removable battery 100. For example, the CPU 228 acquires the remaining capacity and battery current from the removable battery 100 (eg, via the communication unit 220) as the remaining capacity information of the battery.

[0035] In S402, the CPU 228 displays the remaining battery time on the display unit 121. For example, the CPU 228 calculates the remaining charge of the removable battery 100 based on the remaining capacity and battery current (for example, by the remaining charge calculation unit 221), and displays the remaining battery time 304 (shown in FIG. 3A(a)) on the display unit 121 according to the calculated remaining charge.

[0036] In S403, the CPU 228 determines whether or not a USB PD connection with the power supply device 130 is detected. For example, the CPU 228 negotiates in CC communication between the power supply device 130 and the main body device 120 via the CC communication circuit 126. Then, the CPU 228 determines whether or not a USB PD connection with the power supply device 130 is detected (for example, by the connection detection unit 223). If a USB PD connection with the power supply device 130 is detected, the CPU 228 advances the process to S404, and if not, advances the process to S410.

[0037] In S410, the CPU 228 determines (by the remaining charge determination unit 222, for example) based on the remaining charge information acquired in S401 whether or not the remaining battery charge of the removable battery 100 is equal to or less than the initial threshold A1 of the removable battery 100. Here, the threshold A1 is a reference value for determining whether or not to display a warning notice when the main device 120 operates on the power of the removable battery 100 and the remaining battery charge is low. If the CPU 228 determines that the remaining battery charge is equal to or less than the threshold A1, it advances the process to S411, and if not, it advances the process to S412.

[0038] In S411, the CPU 228 causes a warning to be displayed on the display unit 121. For example, the CPU 228 causes (for example, by the warning display control unit 226) the warning display 330 shown in Fig. 3B(b) to be displayed on the entire shooting screen 350. The CPU 228 then ends the series of operations related to Fig. 4. In S412, the CPU 228 returns the process to S401 without displaying a warning.

[0039] In S404, the CPU 228 switches the display on the display unit 121 to a USB PD connection display. For example, the CPU 228 (for example, by the display switching unit 224) switches the display on the display unit 121 to an external power supply connection display 310 shown in Fig. 3A(b). The external power supply connection display 310 indicates that the device is operating on power from an external power supply (for example, supplied from a power supply device, etc.).

[0040] In S405, the CPU 228 switches the initial threshold A1 to the threshold A2 (for example, by the threshold switching unit 225). Here, the threshold A2 is assumed to be greater than the threshold A2. The threshold A1 is a reference value when power is supplied only from the removable battery 100. On the other hand, the threshold A2 is a reference value when the connection of the power supply device 130 is detected in addition to the removable battery 100 (i.e., when power is supplied from the power supply device 130, which is an external device). When both the removable battery 100 and the power supply device 130 are connected to the main device 120, the power supply from the power supply device 130 is prioritized (when the connection of the power supply device is detected, the power of the power supply device 130 is used instead of the battery). In this case, the risk of power shutdown due to a decrease in the remaining charge is lower than when power is supplied from the removable battery 100 alone. For this reason, the threshold A2 can be set to a constant lower than the threshold A1 in order to reduce the nuisance of the warning notification. In this way, by using different thresholds for when the main device 120 operates on battery power and when the connection of a power supply device is detected (power is being supplied from the power supply device), it becomes possible to control the display of a warning based on different criteria according to the risk. In particular, by making the threshold A2 smaller than the threshold A1, it is possible to reduce unnecessary warning displays in situations where the risk of the remaining battery charge is low.

[0041] In S406, the CPU 228 reacquires remaining battery information of the removable battery 100 (for example, by the communication unit 220). In S407, the CPU 228 determines whether the remaining battery charge is equal to or less than a threshold. The CPU 228 calculates the remaining battery charge of the removable battery 100 based on the remaining charge information (for example, by the remaining charge calculation unit 221), and determines (for example, by the remaining charge determination unit 222) whether the remaining battery charge is equal to or less than a threshold A2. If the CPU 228 determines that the remaining battery charge is equal to or less than the threshold A2, the process proceeds to S408, and if not, the process proceeds to S409.

[0042] In S408, the CPU 228 displays a warning on the display unit 121. For example, the warning is displayed on the display unit 121 as a warning display 320 that prompts the user to replace the battery when a (USB Type-C) power supply device is connected as shown in Fig. 3B(a). The CPU 228 then ends the series of operations related to Fig. 4. In S409, the CPU 228 returns the process to S403 without displaying a warning.

[0043] As described above, in the main device 120 to which both the removable battery 100 and the power supply device 130 are connected, different thresholds are used by switching between a case where only the removable battery 100 is connected and a case where the connection of the power supply device 130 is also detected. Here, the threshold is a threshold for determining whether or not to display a warning notice, and for example, when the connection of the power supply device 130 is detected, the threshold is switched from a predetermined threshold A1 to a second threshold A2. Then, when the CPU 228 determines that the remaining battery charge is equal to or lower than the threshold (for example, equal to or lower than A2), it displays a warning display 320 including a display indicating a risk in the case where the connection with the power supply device is lost. In this way, it becomes possible to control the warning display according to different criteria according to the risk when the main device 120 operates on the power of the battery and when the connection of the power supply device is detected (power is being supplied from the power supply device). That is, it is possible to display a warning encouraging battery replacement according to appropriate criteria (even under a situation where the power supply from the power supply device 130 has priority over the power supply from the removable battery 100). When the video camera is operating with a low battery level and the USB interface cable is disconnected, the risk of problems (such as interruption of shooting or damage to recorded data) caused by the device's power being shut down can be reduced. In other words, when a power supply device is connected to receive power, it is possible to reduce problems caused by a low battery level.

[0044] (Embodiment 2) Next, a description will be given of embodiment 2. The main unit of this embodiment differs from embodiment 1 in that it controls warning display according to the operation mode of the main unit, but other points may be substantially the same as embodiment 1. For this reason, the same reference numbers are used for configurations that are the same or substantially the same as embodiment 1, and descriptions thereof are omitted, and the description will focus on the differences.

[0045] As described above, if the remaining battery level of the removable battery 100 decreases while power is being supplied from the connected power supply device 130, the occurrence of adverse effects due to the decrease in the remaining battery level can be reduced by displaying the warning display 320 to prompt the user to replace the battery. On the other hand, the warning display to prompt the user to replace the battery may be annoying if it is displayed frequently. For this reason, in this embodiment, in order to reduce the annoyingness caused by the display, the warning display is displayed by further considering the operation mode of the main body device 120. For example, when the main body device 120 is a professional video camera, it is most important to avoid a situation where the device shuts down during video recording. In such a case, the notification by the warning display is limited to when the video is recorded. In this way, the frequency of displaying the warning notification can be reduced, and usability for the user can be improved.

[0046] <Main unit configuration> An example of the configuration of main body device 120 will be described with reference to Fig. 5. In Fig. 5, an operation mode determination unit 501 is added to the configuration in embodiment 1. The following description will be given taking as an example a case where a warning display is controlled depending on the operation mode of the video camera.

[0047] Operation unit 122 accepts a mode selection operation by a user. When main body device 120 accepts a mode selection operation, main body device 120 transitions from a state in which main body device 120 is started and not recording moving images (e.g., a standby mode) to a moving image recording state (also referred to as a recording mode).

[0048] When an operation mode is selected by the operation unit 122, the operation mode determination unit 501 determines the selected operation mode. In the above-mentioned first embodiment, the notification by the display switching unit 224 (i.e., detection of connection of a power supply device) is used as a trigger to switch the threshold from A1 to A2 by the threshold switching unit 225. On the other hand, in the second embodiment, the determination result by the operation mode determination unit 27 as well as the determination result by the display switching unit 224 are taken into consideration to determine whether or not the threshold switching unit 225 should switch the threshold.

[0049] Next, a series of operations relating to the control of the warning display in main unit 120 will be described with reference to Fig. 6. This series of operations is realized by CPU 228 expanding a computer program stored in ROM 229 into RAM 230, executing it, and causing each part of microcomputer 125 shown in Fig. 2 to perform its functions. This series of operations is started, for example, when CPU 228 detects that removable battery 100 is connected to main unit 120 and the power switch of main unit 120 is ON.

[0050] The CPU 228 performs the processes of S401-S404 in the same manner as in embodiment 1. Through the processes up to S404, the CPU 228 (for example, by the display switching unit 224) switches the display on the display unit 121 to the external power source connection display 310 shown in Fig. 3A(b). That is, the display unit 121 indicates that it is operating with power from an external power source (for example, supplied from a power supply device, etc.).

[0051] In S601, CPU 228 determines whether the operation mode of main body 120 is set to the recording mode (i.e., whether main body 120 is operating in the recording mode). If CPU 228 determines that the operation mode of main body 120 is set to the recording mode, it advances the process to S602, and if not, it advances the process to S409.

[0052] In S602, the CPU 228 switches the display (recording state 710) showing the operation mode shown in FIG. 7(a) from "STANDBY" indicating the standby mode to "REC" indicating the recording mode.

[0053] In S603, (because connection of a power supply device has been detected in S403 and S601 and because it has been determined that the operation mode of the main body device 120 is the recording mode), the CPU 228 switches the threshold value A1 for determining whether or not to display a warning notification to A2. Thereafter, the CPU 228 executes the processes from S406 onwards in the same manner as the processes from S406 to S412 in the first embodiment.

[0054] In this embodiment, when both the removable battery 100 and the power supply device 130 are connected, it is determined whether the operation mode of the main device 120 is a specific operation mode (for example, a recording mode). That is, in addition to detecting the connection of the power supply device 130, when the operation mode is a specific operation mode, a threshold value A2 different from the threshold value A1 is used to determine whether to display a warning. Then, when it is determined that the remaining battery level is equal to or lower than the switched threshold value, a warning display 711 shown in FIG. 7(b) is displayed. In the warning display shown in FIG. 7(b), for example, a display such as "There is a possibility that the device will shut down if the power cable is disconnected due to low remaining battery level. We recommend replacing the battery" is displayed on the display unit 121. This warning display includes, for example, a message indicating the risk of losing the connection with the power supply device and a message encouraging battery replacement. On the other hand, even if the connection of the power supply device 130 is detected, when the operation mode of the main device 120 is an operation mode different from the specific operation mode (for example, a recording mode), no warning display is displayed. In this way, notifications by warning display can be limited to specific operation modes, reducing the frequency with which warning displays are displayed and improving usability for the user.

[0055] In the second embodiment, when the operation mode of the main body device 120 is an operation mode other than a specific operation mode (for example, a recording mode), a warning display is not performed. However, when the operation mode of the main body device 120 is an operation mode other than a specific operation mode, the warning display may be controlled using a threshold value A3 smaller than the threshold value A2 used in the movie mode. For example, the CPU 228 causes the display unit 121 to display a warning regarding the remaining battery power when the remaining battery power is equal to or less than the threshold value A3 smaller than the threshold value A2. Even in this way, the frequency of displaying the warning display can be reduced in operation modes that are not the specific operation modes, thereby improving usability for the user.

[0056] In the above description, the removable battery 100 is configured to be detachable from the main device 120. However, the above embodiment can also use a battery fixed to the main device 120. In that case, the warning display can include a display encouraging battery charging instead of a display encouraging battery replacement.

[0057] (Other embodiments) The present invention can also be realized by a process in which a program for implementing one or more of the functions of the above-described embodiments is supplied to a system or device via a network or a storage medium, and one or more processors in a computer of the system or device read and execute the program. The present invention can also be realized by a circuit (e.g., ASIC) that implements one or more of the functions.

[0058] (Disclosure of the present specification) The disclosure of this specification includes the following electronic device, a control method for an electronic device, and a program. (Item 1) An electronic device, an acquisition means for acquiring information on a remaining capacity of a battery from a battery that supplies power for operating the electronic device; a detection means for detecting a connection of a power supply device that supplies power to the electronic device; a control means for controlling the power supply device to supply power to the electronic device instead of the battery when the connection of the power supply device is detected; a display control means for causing a display means to display a warning regarding a remaining battery charge when the remaining battery charge is equal to or less than a predetermined threshold when the device is operated on the power of the battery, The electronic device is characterized in that the display control means, when connection of the power supply device is detected, causes the display means to display a warning regarding the remaining battery charge in response to the remaining battery charge being equal to or lower than a second threshold different from the predetermined threshold. (Item 2) 2. The electronic device described in item 1, further comprising a switching means for switching a threshold value used by the display control means from the predetermined threshold value to the second threshold value in response to detection of connection of the power supply device. (Item 3) The electronic device described in item 1 or 2, characterized in that when connection of the power supply device is detected, the display control means causes the display means to display a warning regarding the remaining battery charge in response to the remaining battery charge being equal to or less than the second threshold value that is lower than the predetermined threshold value. (Item 4) The electronic device described in any one of items 1 to 3, characterized in that when a connection of the power supply device is detected and the operating mode of the electronic device is a specific operating mode, if the remaining charge of the battery is equal to or less than the second threshold, the display control means causes the display means to display a warning regarding the remaining charge of the battery. (Item 5) The electronic device described in item 4, wherein the display control means does not cause the display means to display a warning regarding the remaining battery charge when the connection of the power supply device is detected and the operation mode of the electronic device is an operation mode different from the specific operation mode. (Item 6) The electronic device described in item 4, characterized in that when connection of the power supply device is detected and the operating mode of the electronic device is an operating mode different from the specific operating mode, the display control means causes the display means to display a warning regarding the remaining battery charge in response to the remaining battery charge being equal to or less than a third threshold value that is lower than the second threshold value. (Item 7) The electronic device described in any one of items 1 to 6, characterized in that, when a connection of the power supply device is detected, the display control means causes the display means to display a warning content different from the warning content that would be displayed when operating on battery power. (Item 8) 8. The electronic device according to item 7, wherein the content of the warning displayed on the display means when the connection of the power supply device is detected includes a display indicating a risk if the connection to the power supply device is lost. (Item 9) The power supply device is a device based on the USB (Universal Serial Bus) standard, 9. The electronic device according to any one of items 1 to 8, wherein the detection means detects the connection of the power supply device using communication based on the USB PD (Power Delivery) standard. (Item 10) the battery is a battery that is detachable from the electronic device, 10. The electronic device according to any one of claims 1 to 9, wherein the detection means detects connection of the power supply device when the battery is attached to the electronic device. (Item 11) A method for controlling an electronic device, comprising: an acquisition step of acquiring information on a remaining capacity of a battery from a battery that supplies power for operating the electronic device; a detection step of detecting a connection of a power supply device that supplies power to the electronic device; a control step of controlling the power supply device to supply power to the electronic device instead of the battery when the connection of the power supply device is detected; a display control step of displaying a warning regarding a remaining battery charge on a display means when the remaining battery charge is equal to or less than a predetermined threshold when the device is operated on the power of the battery, In the display control process, when connection of the power supply device is detected, a warning regarding the remaining battery charge is displayed on the display means in response to the remaining battery charge being equal to or lower than a second threshold different from the predetermined threshold. (Item 12) A program for causing a computer to function as each of the means of the electronic device described in any one of items 1 to 10.

[0059] The invention is not limited to the above-described embodiments, and various modifications and variations are possible without departing from the spirit and scope of the invention. Accordingly, the following claims are appended to apprise the public of the scope of the invention. [Explanation of symbols]

[0060] 100: removable battery, 120: main body device, 130: power supply device, 222: remaining battery level determination unit, 225: threshold switching unit, 226: warning display control unit, 121: display unit

Claims

1. An electronic device, an acquisition means for acquiring information on a remaining capacity of a battery from a battery that supplies power for operating the electronic device; a detection means for detecting a connection of a power supply device that supplies power to the electronic device; a control means for controlling the power supply device to supply power to the electronic device instead of the battery when the connection of the power supply device is detected; a display control means for causing a display means to display a warning regarding a remaining battery charge when the remaining battery charge is equal to or less than a predetermined threshold when the device is operated on the power of the battery, The electronic device is characterized in that, when connection of the power supply device is detected, the display control means causes the display means to display a warning regarding the remaining battery charge when the remaining battery charge is equal to or less than a second threshold value different from the specified threshold value.

2. 2. The electronic device according to claim 1, further comprising a switching means for switching a threshold value used by the display control means from the predetermined threshold value to the second threshold value in response to detection of connection of the power supply device.

3. 2. The electronic device according to claim 1, wherein the display control means, when a connection of the power supply device is detected, causes the display means to display a warning regarding the remaining battery charge in response to the remaining battery charge being equal to or less than the second threshold value which is lower than the predetermined threshold value.

4. The electronic device according to claim 1, characterized in that when a connection of the power supply device is detected and the operating mode of the electronic device is a specific operating mode, the display control means causes the display means to display a warning regarding the remaining battery charge when the remaining battery charge is equal to or less than the second threshold.

5. 5. The electronic device according to claim 4, wherein the display control means does not cause the display means to display a warning regarding the remaining battery charge when the connection of the power supply device is detected and the operating mode of the electronic device is an operating mode different from the specific operating mode.

6. The electronic device according to claim 4, characterized in that when connection of the power supply device is detected and the operating mode of the electronic device is an operating mode different from the specific operating mode, the display control means causes the display means to display a warning regarding the remaining battery charge in response to the remaining battery charge being equal to or lower than a third threshold value that is lower than the second threshold value.

7. 2. The electronic device according to claim 1, wherein, when a connection of the power supply device is detected, the display control means causes the display means to display a warning content different from the warning content that is displayed when the electronic device is operating on battery power.

8. 8. The electronic device according to claim 7, wherein the content of the warning displayed on the display means when the connection of the power supply device is detected includes a display indicating a risk in the event that the connection to the power supply device is lost.

9. The power supply device is a device based on the USB (Universal Serial Bus) standard, 2. The electronic device according to claim 1, wherein the detection means detects the connection of the power supply device using communication based on the USB PD (Power Delivery) standard.

10. the battery is a battery that is detachable from the electronic device, 2. The electronic device according to claim 1, wherein the detection means detects the connection of the power supply device when the battery is attached to the electronic device.

11. A method for controlling an electronic device, comprising: an acquisition step of acquiring information on a remaining capacity of a battery from a battery that supplies power for operating the electronic device; a detection step of detecting a connection of a power supply device that supplies power to the electronic device; a control step of controlling the power supply device to supply power to the electronic device instead of the battery when the connection of the power supply device is detected; a display control step of displaying a warning regarding a remaining battery charge on a display means when the remaining battery charge is equal to or less than a predetermined threshold when the device is operated on the power of the battery, In the display control process, when connection of the power supply device is detected, a warning regarding the remaining battery charge is displayed on the display means in response to the remaining battery charge being equal to or lower than a second threshold different from the predetermined threshold.

12. A program for causing a computer to function as each of the means of the electronic device according to any one of claims 1 to 10.

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