Electronic device, control method, and program

Abstract

To provide a technique capable of continuing the operation of an electronic apparatus while receiving power supply from an external apparatus without affecting the cost and size of the electronic apparatus.SOLUTION: The electronic device includes a first connection unit configured to connect to a power supply device, a second connection unit configured to connect to a battery, and a control unit configured to: And a voltage conversion unit configured to convert the power received from the battery or the power supply device into a voltage at which the electronic device is operable, wherein the control unit performs predetermined control to limit the current to a first current when the electronic device operates in a first mode, and to limit the current to a second current smaller than the first current when the electronic device operates in a second mode, and a maximum power of the electronic device in the second mode is larger than that in the first mode.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an electronic device that can operate with power supplied from a power supply device, a control method, and a program. [Background technology]

[0002] Due to the increasing power consumption associated with higher performance, electronic devices such as digital cameras may operate using power supplied from external devices, and continue to operate by using a battery to make up for any power shortfall. Known standards for power supply include, for example, USB PD (Power Delivery) Revision 2.0 / 3.0 in the USB (Universal Serial Bus) 3.1 standard.

[0003] Patent Document 1 describes an imaging device that allows operation in video shooting mode when the battery voltage is below a predetermined voltage, and turns off the power in still image shooting mode. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2023-091501 Summary of the Invention [Problem to be solved by the invention]

[0005] As in Patent Document 1, if the power is turned off in still image mode even though the camera is receiving power from the power supply device, it will be unable to continue taking pictures.

[0006] Furthermore, when an electronic device receives power from an external device, it must convert the voltage supplied from the external device into a voltage usable by the electronic device using a voltage converter or the like. However, if power is simultaneously supplied from a battery, the output voltage of the voltage converter drops to the battery voltage. This increases the difference between the voltage supplied from the external device and the output voltage of the voltage converter, potentially increasing the current flowing through the voltage converter. However, if the rated current of the voltage converter is increased to account for the increased current flowing through the voltage converter, the size of the voltage converter will increase, affecting the cost and size of the electronic device.

[0007] The present invention has been made in consideration of the above-mentioned problems, and its purpose is to realize a technology that allows an electronic device to continue operating while receiving power from an external device without affecting the cost or size of the electronic device. [Means for solving the problem]

[0008] In order to solve the above problems and achieve the object, the electronic device of the present invention has a first connection means for connecting a power supply device, a second connection means for connecting a battery, a control means for limiting the current of power received from the power supply device so that it does not exceed the current of power that the power supply device can supply, and a voltage conversion means for converting the power received from the battery or the power supply device into a voltage at which the electronic device can operate, wherein the control means performs predetermined control to limit the current to a first current when the electronic device is operating in a first mode, and to a second current smaller than the first current when the electronic device is operating in a second mode, and the second mode has a maximum power of the electronic device greater than that of the first mode. [Effects of the Invention]

[0009] According to the present invention, it is possible to allow an electronic device to continue operating while receiving power from an external device, without affecting the cost or size of the electronic device. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram illustrating a system in which an electronic device and a power supply device according to an embodiment are connected. [Figure 2] FIG. 1 is a block diagram illustrating a configuration of an electronic device according to an embodiment of the present invention. [Figure 3] FIG. 2 is a block diagram illustrating the configuration of a charging and power supply control unit according to the embodiment. [Figure 4] 5A and 5B are diagrams illustrating examples of power consumption and current consumption of the electronic device for each shooting mode according to the present embodiment. [Figure 5] 4 is a flowchart illustrating a control process of a charging and power supply control unit of the present embodiment. [Figure 6] 5A and 5B are diagrams illustrating examples of current consumption of an electronic device and current supply of a power supply device and a battery for each shooting mode according to the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. Note that the following embodiments do not limit the scope of the invention claimed. Although multiple features are described in the embodiments, not all of these multiple features are necessarily essential to the invention, and multiple features may be combined arbitrarily. Furthermore, in the accompanying drawings, the same reference numerals are used to designate the same or similar components, and redundant explanations will be omitted.

[0012] <Device configuration> FIG. 1 illustrates a system configuration in which an electronic device and a power supply device according to this embodiment are connected.

[0013] In this embodiment, the electronic device is an imaging device that can operate as a digital camera that can capture still images and videos. However, the electronic device is not limited to a digital camera, and may be an electronic device that can operate as a media player, a smartphone, or a personal computer.

[0014] The electronic device 100 includes an imaging unit 102, an operation unit 104, a connection unit 110, and the like, and a battery 111 is detachable and can operate using the power of the battery 111.

[0015] The power supply device 300 is an AC adapter that can be used as a commercial power source, a personal computer with power supply capability, a mobile battery, or the like.

[0016] The connection unit 110 is a connector that complies with the USB (Universal Serial Bus) Type-C standard, and can be connected to a power supply device 300 via a USB Type-C cable 200. The power supply device 300 can supply power to the connection unit 110 via the USB Type-C cable 200. The electronic device 100 can operate using power supplied from the power supply device 300 and / or a battery 111. The electronic device 100 can also charge the battery 111 using power supplied from the power supply device 300.

[0017] Furthermore, the power supply device 300 is a source device in the USB PD standard, and the electronic device 100 is a sink device in the USB PD standard.

[0018] Next, the components of the electronic device 100 will be described with reference to FIG.

[0019] The main control unit 101 has a processor such as a CPU for controlling the components of the electronic device 100. The main control unit 101 can control the components of the electronic device 100 in accordance with a program stored in the non-volatile memory 107. Note that instead of the main control unit 101 controlling the entire electronic device 100, the entire electronic device 100 may be controlled by a plurality of hardware components sharing the processing load.

[0020] The imaging unit 102 converts the subject light imaged by the lens included in the imaging unit 102 into an electrical signal, performs noise reduction processing, etc., and outputs the digital data as image data. The captured image data is stored in a buffer memory, and then undergoes predetermined calculations in the main control unit 101 and is recorded on a recording medium 103.

[0021] The recording medium 103 can record image data output from the imaging unit 102. The recording medium 103 may be configured to be removable from the electronic device 100, or may be configured not to be easily removable from the electronic device 100. In either case, it is sufficient that the electronic device 100 can access the recording medium 103.

[0022] The operation unit 104 receives user instructions from the user and transmits a signal corresponding to the user instruction to the main control unit 101 or the sub-control unit 108. The operation unit 104 includes, for example, operation members such as a power button for turning the electronic device 100 on or off, a release switch for issuing a shooting instruction, and a zoom lever for issuing a zoom instruction. The operation unit 104 also includes a playback button for issuing a playback instruction for image data, a mode dial for specifying the startup mode of the electronic device 100, and a touch panel formed on the display unit 105 (described later). The release switch outputs a first switch signal SW1 or a second switch signal SW2. When the release switch is pressed halfway, the first switch signal SW1 is turned on. This allows the main control unit 101 to receive instructions for performing shooting preparations such as AF (autofocus) processing, AE (automatic exposure) processing, and AWB (auto white balance) processing. When the release switch is pressed fully, the second switch signal SW2 is turned on. As a result, the main control unit 101 receives an instruction to perform photography.

[0023] The display unit 105 displays a viewfinder image during shooting, displays captured image data, displays characters for interactive operations, etc. Note that the display unit 105 does not necessarily have to be built into the electronic device 100.

[0024] The volatile memory 106 is, for example, a DRAM, and is used as a buffer memory for temporarily storing image data captured by the imaging unit 102, an image display memory for the display unit 105, a work area for the main control unit 101, etc.

[0025] The nonvolatile memory 107 is, for example, a flash ROM, and stores programs executed by the main control unit 101, which will be described later.

[0026] The sub-control unit 108 has a processor such as a CPU for controlling some of the components of the electronic device 100. The sub-control unit 108 can control some of the components of the electronic device 100 in accordance with a program stored in a memory connected to the sub-control unit 108. The sub-control unit 108 can operate with lower power consumption than the main control unit 101, operates as a power control circuit that can control a charging / power supply control unit 109 (described later), and can communicate with the main control unit 101.

[0027] The charging and power supply control unit 109 supplies the power received from the power supply device 300 via the connection unit 110 to each component of the electronic device 100, and at the same time, the charging and power supply control unit 109 can charge the battery 111 with the power received from the connection unit 110.

[0028] The connection unit 110 is an interface for connecting to the power supply device 300. The electronic device 100 can exchange data with the power supply device 300 via the connection unit 110. The electronic device 100 can also receive power from the power supply device 300 via the connection unit 110. In this embodiment, the electronic device 100 operates as a USB device, and the connection unit 110 includes an interface connector for communicating with the power supply device 300 via USB and a USB device controller. The main control unit 101 controls the connection unit 110 to communicate with the power supply device 300 via USB and to charge the device via USB. In this embodiment, the electronic device 100 can be switched between a power receiving mode in a power-on state in which the electronic device operates by receiving power from the battery 111, and a charging mode in a power-off state in which the electronic device 100 charges the battery 111 with power received from the power supply device 300.

[0029] The battery 111 is capable of supplying power for operating the electronic device 100. The battery 111 is configured to be removable from the electronic device 100, and is capable of receiving power from the connection unit 110 via the charging and power supply control unit 109 and being charged. The battery 111 has a processor and memory that perform battery authentication processing, and the authentication unit of the battery 111 performs battery authentication processing between the main control unit 101 or the sub-control unit 108 of the electronic device 100.

[0030] The power supply control unit 112 controls the supply and cut-off of power from the battery 111 or the charging and power supply control unit 109 to each component of the electronic device 100 according to the state of the electronic device 100. The power supply control unit 112 is controlled by the main control unit 101 or the sub control unit 108.

[0031] Next, components of charging / power supply control unit 109 will be described with reference to FIG.

[0032] The information acquisition unit 301 is connected to the CC terminal of the connection unit 110, and performs communication in accordance with the USB PD (Power Delivery) standard. The information acquisition unit 301 can detect the power supply capability of the connected power supply device 300 from the terminal voltage of the CC terminal, and can also perform negotiation to determine the power supplied from the connected power supply device 300 through communication using the CC terminal.

[0033] The input control unit 302 is connected to the VBUS terminal of the USB connector, which is the connection unit 110. The input control unit 302 can receive power from the power supply device 300 connected to the VBUS terminal, and switches whether or not to supply power to the current limiting unit 303 based on information from the information acquisition unit 301.

[0034] The current limiting unit 303 limits the amount of current supplied from the power supplying device 300 based on information related to the power supply capacity of the power supplying device 300 acquired by the information acquiring unit 301. As will be described later, the current limiting unit 303 limits the amount of current supplied from the power supplying device 300 so as not to exceed a set limit current value. For example, when the power supply capacity of the power supplying device 300 is 45 W (15 V / 3 A), the limit current value is set to 2.9 V, and the amount of current is limited to 2.9 A or the like so as not to exceed 3 A, which is the maximum value of current that the power supplying device 300 can supply (the supply limit of the power supply capacity).

[0035] The voltage conversion unit 304 controls conversion of the VBUS voltage supplied via the input control unit 302 and the current limiting unit 303 into a voltage that can be received by the power supply control unit 112 and the battery 111. In this embodiment, in a power receiving mode in which power is supplied to the power supply control unit 112, the voltage conversion unit 304 increases or decreases the received voltage of 5 V, 9 V, or 15 V to an appropriate voltage (approximately 12 V). Furthermore, in a charging mode in which the electronic device 100 is in a charging mode, the voltage conversion unit 304 converts the voltage into a voltage required to charge the battery 111. In this embodiment, since the battery 111 is configured with two cells, it is CC / CV charged so that it is fully charged at 8.4 V. The battery 111 may be configured with one cell or three cells.

[0036] When the electronic device 100 is in the power receiving mode, if the power consumption of the electronic device 100 exceeds the power supply capacity of the power supply device 300 and the current output to the power supply control unit 112 is limited by the current limiting unit 303, the output voltage of the voltage conversion unit 304 drops to a voltage equivalent to that of the battery 111. In this case, the battery 111 supplies the insufficient power, allowing the electronic device 100 to continue operating.

[0037] Voltage conversion unit 304 is a switching regulator that increases or decreases the voltage, and requires inductor 305. The rated current that can be passed through inductor 305 is predetermined, and products with higher rated currents tend to be larger in size.

[0038] The battery connector 306 is a holder to which the battery 111 can be connected. The battery connector 306 has a power supply terminal for supplying power, a GND terminal, a terminal for connecting to the authentication unit of the battery 111, and a terminal for connecting to a thermistor terminal of the battery 111.

[0039] FIG. 4 illustrates the power consumption and current consumption of the electronic device 100 for each shooting mode of the present embodiment.

[0040] FIG. 4(a) illustrates the maximum value (maximum power) and average value (average power) of power consumption of the electronic device 100 in the still image capture mode and the moving image capture mode.

[0041] In still image capture mode, the maximum value of current consumed (maximum current) is higher than in video capture mode, while the average value of current consumed (average current) is lower. Figure 4(b) illustrates an example of the change in current of electronic device 100 over time during continuous shooting in still image capture mode. In Figure 4(b), the horizontal axis represents time, and the vertical axis represents the amount of current required by electronic device 100.

[0042] When the electronic device 100 is powered on, the main control unit 101 places the electronic device 100 in a shooting standby state and controls the image capture unit 102 to capture a live view image. In the shooting standby state, images captured by the image capture unit 102 are sequentially displayed on the display unit 105 as live view images. In still image shooting mode, the electronic device 100 operates with low power consumption while displaying a live view image in the shooting standby state. Meanwhile, when image data for recording is captured and recorded on the recording medium 103 in response to a user instruction to capture a still image, the power consumption of the electronic device 100 increases. In this embodiment, the electronic device 100 performs high-speed readout, which reads the image data from the image capture unit 102 in a short time, to reduce rolling distortion in the image captured by the image capture unit 102. Therefore, the electronic device 100 momentarily requires a large current. As shown in FIG. 4B, a current exceeding the supply limit of the power supply device 300 is required when the image data from the image capture unit 102 is read. In this embodiment, the power supply capacity of the power supply device 300 is assumed to be 45 W (15 V / 3 A). In this case, the current consumed by the electronic device 100 exceeds 3 A, which is the supply limit of the power supply device 300 indicated by the dashed line. Therefore, the current that is insufficient when the supply limit of the power supply device 300 is exceeded is supplied from the battery 111. However, because the readout of the imaging unit 102 is performed in a short time, the total power supplied from the battery 111 is small and does not significantly affect the decrease in the remaining battery charge.

[0043] In video shooting mode, the maximum current is lower than in still image shooting mode, but the average current is higher than in still image shooting mode. Figure 4(c) shows an example of the change in current over time when shooting a video in video shooting mode. In Figure 4(c), the horizontal axis represents time, and the vertical axis represents the amount of current required by electronic device 100.

[0044] In video shooting mode, the effect of rolling distortion on each screen of a video shot by the imaging unit 102 is less than that of a still image shot in still image shooting mode. When shooting a video in video shooting mode, the time required to read image data for each screen from the imaging unit 102 can be made longer. Therefore, the maximum current in video shooting mode can be made lower than the maximum current in still image shooting mode. On the other hand, when the frame rate of the video being shot is increased, image correction processing and compression processing must be performed at high speed, so the average amount of current consumed by the electronic device 100 becomes higher than in still image shooting mode.

[0045] As shown in FIG. 4(c), the maximum power in the video shooting mode does not exceed the supply limit of the power supply of the power supply device 300 at the timing of readout of the image capture unit 102. In this embodiment, the power supply capacity of the power supply device 300 is 45 W (15 V / 3 A). As shown by the dashed line in FIG. 4(c), the maximum power in the video shooting mode does not exceed 3 A, which is the supply limit of the power supply of the power supply device 300. Therefore, in the video shooting mode, it is possible to shoot a video without receiving power supply from the battery 111.

[0046] Next, FIG. 5 is a flowchart illustrating a control process performed by the charging / power supply control unit 109 of this embodiment.

[0047] In step S501, the charging and power supply control unit 109 starts processing when the electronic device 100 is started up.

[0048] In step S502, the charging / power supply control unit 109 determines whether or not the power supply device 300 is connected to the connection unit 110. If the power supply device 300 is connected, the process proceeds to step S503; if the power supply device 300 is not connected, the process ends.

[0049] In step S503, the charging and power supply control unit 109 checks the information of the power supply device 300 using the information acquisition unit 301. Then, the charging and power supply control unit 109 determines whether the power supply device 300 is a high-power compatible power supply device. If the power supply device 300 is high-power compatible, the charging and power supply control unit 109 proceeds to step S505, and if it is not high-power compatible, the charging and power supply control unit 109 proceeds to step S504. In this embodiment, if the power supply capacity is equal to or greater than a predetermined power, the power supply device is determined to be a high-power compatible power supply device, and if the power supply capacity is less than the predetermined power, the power supply device is determined to be a non-high-power compatible power supply device. The predetermined power is, for example, 45 W (15 V / 3 A).

[0050] In step S504, the charging and power supply control unit 109 sets the value of the limited current by the current limiting unit 303 based on the power supply capacity of the power supply device 300. For example, if the power supply capacity of the power supply device 300 is 15 W (5 V / 3 A), the limited current is set to 2.9 A, which does not exceed the supply limit. Also, if the power supply capacity of the power supply device 300 is 18 W (9 V / 2 A), the limited current is set to 1.9 A, which does not exceed the supply limit. By setting the limited current in this manner, when the current consumption of the electronic device 100 does not exceed the supply limit of the power supply device 300, the electronic device 100 can be operated with the supply current of the power supply device 300. Also, when the current consumption of the electronic device 100 exceeds the supply limit of the power supply device 300, the electronic device 100 can be operated with both the current supplied from the power supply device 300 and the current supplied from the battery 111.

[0051] In step S505, the charging and power supply control unit 109 determines the shooting mode of the electronic device 100. If the shooting mode of the electronic device 100 is the moving image shooting mode, the charging and power supply control unit 109 proceeds to step S506, and if the shooting mode is the still image shooting mode, the charging and power supply control unit 109 proceeds to step S507.

[0052] In step S506, the charging / power supply control unit 109 sets the limited current by the current limiting unit 303 based on the power supply capacity of the power supply equipment 300. For example, if the power supply capacity of the power supply equipment 300 is 45 W (15 V / 3 A), the limited current is set to 2.9 A, which does not exceed the supply limit.

[0053] In step S507, the charging / power supply control unit 109 determines whether or not the voltage of the battery 111 is equal to or greater than a predetermined value using the sub-control unit 108. If the sub-control unit 108 determines that the voltage of the battery 111 is equal to or greater than the predetermined value, the charging / power supply control unit 109 proceeds to step S506, and if the sub-control unit 108 determines that the voltage of the battery 111 is not equal to or greater than the predetermined value, the charging / power supply control unit 109 proceeds to step S508.

[0054] In step S506, if the voltage of the battery 111 is equal to or higher than a predetermined value, the charging / power supply control unit 109 sets a first limit current for the current limiting unit 303 based on the power supply capacity of the power supply equipment 300. For example, if the voltage of the battery 111 is equal to or higher than 7.2 V and the power supply capacity of the power supply equipment 300 is 45 W (15 V / 3 A), the limit current is set to 2.9 A, which does not exceed the supply limit.

[0055] In step S508, if the voltage of the battery 111 is not equal to or higher than a predetermined value, the charging / power supply control unit 109 sets a second limit current (<first limit current) for the current limiting unit 303 based on the power supply capacity of the power supply device 300. If the same limit current as when the voltage of the battery 111 is equal to or higher than the predetermined value is set when the voltage of the battery 111 is not equal to or higher than the predetermined value, the output voltage of the voltage conversion unit 304 may decrease, possibly exceeding the rated current of the inductor 305. Therefore, the charging / power supply control unit 109 sets a second limit current that is smaller than the first limit current (2.9 A) set in step S506. For example, if the battery 111 is not equal to or higher than 7.2 V, the second limit current is set to 1.0 A even if the power supply capacity of the power supply device 300 is 45 W (15 V / 3 A). By limiting the current in this manner, it is possible to supply the necessary power to the electronic device 100 without exceeding the rated current of the inductor 305, and the electronic device 100 can operate with the power supplied from the power supply device 300.

[0056] The same control is performed when the power supply capacity of the power supply device 300 is even greater, such as 60 W (20 V / 3 A). However, if the power consumption of the electronic device 100 does not exceed 60 W (20 V / 3 A), the limit current may be set based on the power supply capacity of the power supply device 300.

[0057] Furthermore, when the power supply capacity of the power supply equipment 300 is changed during connection, the same process is executed based on the changed power supply capacity.

[0058] 6 illustrates the current consumption of the electronic device 100 and the current supplied by the power supply device and the battery for each shooting mode of the present embodiment. In FIG. 6, the horizontal axis represents time, and the vertical axis represents the amount of current required by the electronic device 100.

[0059] Fig. 6(a1) illustrates the overall current consumption of the electronic device 100 in the still image capture mode. The operation of the electronic device 100 in the still image capture mode is as described in Fig. 4(b). Fig. 6(a2) illustrates the current supplied from the power supply device 300 when the power supply capacity of the power supply device 300 is 45 W (15 V / 3 A) in the still image capture mode. Fig. 6(a3) illustrates the current supplied from the battery 111 when the power supply capacity of the power supply device 300 is 45 W (15 V / 3 A) in the still image capture mode.

[0060] In the still image capture mode, even if the power supply capacity of the power supply device 300 is 45 W (15 V / 3 A), the current consumption of the electronic device 100 exceeds the supply limit of 3 A of the power supply device 300, as shown in FIG. 6(a1). For this reason, as shown in FIG. 6(a2), the supply current of the power supply device 300 is limited to about 1.0 A so as not to exceed the rated current of the inductor 305, and the insufficient current is supplied from the battery 111, as shown in FIG. 6(a3). In this case, the period during which power is supplied from the battery 111 is extremely short, and therefore the decrease in the remaining capacity of the battery 111 is extremely small. As a result, the current supplied from the power supply device 300 is limited so as not to exceed the rated current of the inductor 305, and the electronic device 100 can be operated with the power supplied from the power supply device 300 while minimizing the decrease in the remaining capacity of the battery 111.

[0061] Fig. 6(b1) illustrates the overall current consumption of the electronic device 100 in the video shooting mode. The operation of the electronic device 100 in the video shooting mode is as described in Fig. 4(c). Fig. 6(b2) illustrates the current supplied from the power supply device 300 when the power supply capacity of the power supply device 300 is 45 W (15 V / 3 A) in the video shooting mode. Fig. 6(b3) illustrates the current supplied from the battery 111 when the power supply capacity of the power supply device 300 is 45 W (15 V / 3 A) in the video shooting mode.

[0062] In the video shooting mode, even if the power supply capacity of the power supply device 300 is 45 W (15 V / 3 A), the current consumption of the electronic device 100 does not exceed 3 A, which is the supply limit of the power supply device 300, as shown in Fig. 6(b1). Therefore, as shown in Fig. 6(b2), the current supplied from the power supply device 300 is limited to 2.9 A, which does not exceed the supply limit, and no current is supplied from the battery 111, as shown in Fig. 6(b3). In the video shooting mode, the maximum power does not exceed the supply limit of the power supplied by the power supply device 300, so the electronic device 100 can operate without exceeding the rated current of the inductor 305 and without receiving power supply from the battery 111.

[0063] In this embodiment, the second limit current in the still image capture mode is set to a current amount smaller than the first limit current in the video capture mode. However, even in the still image capture mode, if the power supplied from the power supply device 300 is sufficient and power supply from the battery 111 is not required, such as in a mechanical shutter mode in which the readout speed of the image capture unit 102 is slow, the limit current does not need to be changed to the second limit current. Conversely, in the video capture mode, if the maximum power is increased due to a wireless connection or accessory connection, the limit current may be changed from the first limit current to the second limit current.

[0064] Furthermore, in the present embodiment, an example has been described in which the battery 111 is charged when the electronic device 100 is in a power-off state, but this is not limiting. For example, the battery 111 may be charged using surplus power within the range of power supplied from the power supply device 300 when the electronic device 100 is in a power-on state, such as during live view in a still image shooting mode. Charging the battery 111 using surplus power can further reduce the impact of a decrease in the remaining charge of the battery 111, even if power is temporarily supplied from the battery 111 when reading data from the imaging unit 102.

[0065] As described above, according to the present embodiment, it is possible to enable the electronic device 100 to continue operating while receiving power supply from the power supply device 300 without affecting the cost or size of the electronic device 100. Specifically, the limited current when the electronic device 100 is operating in the still image shooting mode is controlled to be smaller than the limited current when the electronic device 100 is operating in the video shooting mode, which has a lower maximum power than the still image shooting mode. This allows the electronic device 100 to operate with power supplied from the power supply device 300 while preventing the rated current of the inductor 305 from being exceeded and minimizing reduction in the remaining capacity of the battery 111.

[0066] [Other embodiments] The present invention can also be realized by supplying a program that realizes one or more functions of the above-described embodiments to a system or device via a network or a storage medium, and having one or more processors in the computer of the system or device read and execute the program. It can also be realized by a circuit (e.g., ASIC) that realizes one or more functions.

[0067] The invention is not limited to the above-described embodiments, and various changes and modifications can be made 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.

[0068] The disclosure of this specification includes the following electronic device, control method, and program. [Configuration 1] An electronic device, a first connection means for connecting a power supply device; a second connecting means for connecting the battery; a control means for limiting the current of the power received from the power supply device so that the current does not exceed the current of the power that the power supply device can supply; a voltage conversion means for converting the power received from the battery or the power supply device into a voltage at which the electronic device can operate; the control means performs predetermined control to limit the current to a first current when the electronic device is operating in a first mode, and to a second current smaller than the first current when the electronic device is operating in a second mode; The electronic device is characterized in that the second mode has a higher maximum power of the electronic device than the first mode. [Configuration 2] 2. The electronic device according to configuration 1, wherein the control means controls the battery to supply power that is insufficient due to limiting the current to the second current in the second mode. [Configuration 3] The electronic device according to configuration 1 or 2, characterized in that the control means controls the electronic device so that power is not supplied from the battery when the electronic device can operate with power supplied from the power supply device in the first mode. [Configuration 4] 4. The electronic device according to any one of configurations 1 to 3, wherein the control unit performs the predetermined control when the power that the power supply device can supply is equal to or greater than a predetermined power. [Configuration 5] 4. The electronic device according to any one of configurations 1 to 3, wherein the control means does not perform the predetermined control when the power that the power supply device can supply is less than a predetermined power. [Configuration 6] The electronic device according to any one of configurations 1 to 4, wherein the control means does not perform control to limit the current to the second current when the voltage of the battery is equal to or higher than a predetermined value in the second mode, but performs control to limit the current to the first current. [Configuration 7] 5. The electronic device according to any one of configurations 1 to 4, wherein the control means performs control to limit the current to the second current when the voltage of the battery is less than a predetermined value in the second mode. [Configuration 8] a communication means for communicating with the power supply device; the control means determines the power to be supplied from the power supply equipment through the communication; 8. The electronic device according to any one of configurations 1 to 7, wherein the first current and the second current are smaller than a maximum current of the power supplied from the power supply device. [Configuration 9] a maximum power of the electronic device in the first mode is smaller than the power supplied from the power supply device; 9. The electronic device according to any one of configurations 1 to 8, wherein the maximum power of the electronic device in the second mode is greater than the power supplied from the power supply device. [Configuration 10] 10. The electronic device according to any one of configurations 1 to 9, wherein the average power of the electronic device in the first mode is greater than the average power of the electronic device in the second mode. [Configuration 11] the electronic device is an imaging device capable of taking still images or moving images, 11. The electronic device according to any one of configurations 1 to 10, wherein the first mode is a still image shooting mode, and the second mode is a moving image shooting mode. [Configuration 12] A method for controlling an electronic device, comprising: The electronic device includes: a first connection means for connecting a power supply device; a second connecting means for connecting the battery; a voltage conversion means for converting the power received from the battery or the power supply device into a voltage at which the electronic device can operate; The control method includes: a step of limiting the current of the power received from the power supply device so that the current does not exceed the current of the power that can be supplied by the power supply device; In the step, when the electronic device is operating in a first mode, the current is limited to a first current, and when the electronic device is operating in a second mode, the current is limited to a second current smaller than the first current; A control method, wherein the second mode has a higher maximum power of the electronic device than the first mode. [Configuration 13] A program for causing a computer to function as an electronic device according to any one of configurations 1 to 11. [Explanation of symbols]

[0069] 100...electronic device, 101...main control unit, 110...connection unit, 108...sub-control unit, 109...charging and power supply control unit, 111...battery, 300...power supply device, 303...current limiting unit, 304...voltage conversion unit, 305...inductor, 306...battery connection unit

Claims

1. An electronic device, a first connection means for connecting a power supply device; a second connecting means for connecting the battery; a control means for limiting the current of the power received from the power supply device so that the current does not exceed the current of the power that the power supply device can supply; a voltage conversion means for converting the power received from the battery or the power supply device into a voltage at which the electronic device can operate; the control means performs predetermined control to limit the current to a first current when the electronic device is operating in a first mode, and to a second current smaller than the first current when the electronic device is operating in a second mode; The electronic device is characterized in that the second mode has a maximum power of the electronic device greater than that of the first mode.

2. 2. The electronic device according to claim 1, wherein the control means controls the battery to supply power that is insufficient due to the current being limited to the second current in the second mode.

3. 2. The electronic device according to claim 1, wherein the control means controls the electronic device so that power is not supplied from the battery when the electronic device can operate with power supplied from the power supply device in the first mode.

4. 2. The electronic device according to claim 1, wherein the control unit performs the predetermined control when the power that the power supply device can supply is equal to or greater than a predetermined power.

5. 2. The electronic device according to claim 1, wherein the control unit does not perform the predetermined control when the power that the power supply device can supply is less than a predetermined power.

6. 2. The electronic device according to claim 1, wherein the control means does not perform control to limit the current to the second current when the voltage of the battery is equal to or higher than a predetermined value in the second mode, but performs control to limit the current to the first current.

7. 2. The electronic device according to claim 1, wherein the control means performs control to limit the current to the second current when the voltage of the battery is less than a predetermined value in the second mode.

8. a communication means for communicating with the power supply device; the control means determines the power to be supplied from the power supply equipment through the communication; The electronic device according to claim 1 , wherein the first current and the second current are smaller than a maximum current of the power supplied from the power supply device.

9. a maximum power of the electronic device in the first mode is smaller than the power supplied from the power supply device; The electronic device according to claim 1 , wherein a maximum power of the electronic device in the second mode is greater than the power supplied from the power supply device.

10. 2. The electronic device of claim 1, wherein an average power of the electronic device in the first mode is greater than an average power of the electronic device in the second mode.

11. the electronic device is an imaging device capable of taking still images or moving images, 2. The electronic device according to claim 1, wherein the first mode is a still image shooting mode, and the second mode is a moving image shooting mode.

12. A method for controlling an electronic device, comprising: The electronic device includes: a first connection means for connecting a power supply device; a second connecting means for connecting the battery; a voltage conversion means for converting the power received from the battery or the power supply device into a voltage at which the electronic device can operate; The control method includes: a step of limiting the current of the power received from the power supply device so that the current does not exceed the current of the power that can be supplied by the power supply device; In the step, when the electronic device is operating in a first mode, the current is limited to a first current, and when the electronic device is operating in a second mode, the current is limited to a second current smaller than the first current; A control method, characterized in that the second mode has a higher maximum power of the electronic device than the first mode.

13. A program for causing a computer to function as the electronic device according to any one of claims 1 to 11.

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