Electronic apparatus, control method and program for electronic apparatus

Abstract

To provide an electronic apparatus capable of easily responding to a changed operation condition in a case where the operation condition of the electronic apparatus is changed, and capable of shortening as much as possible a standby time in which a user cannot operate the electronic apparatus and is on standby, and to provide a control method and a program for an electronic apparatus.SOLUTION: An imaging apparatus 100 can take a first power supply state where power is supplied from a power supply device 120 and a second power supply state where power is supplied from a built-in battery 110. The imaging apparatus 100 comprises acquisition means (processor 103) which acquires a power consumption value which is consumed in the imaging apparatus 100, switch means (power supply circuit 109) which switches the first power supply state and the second power supply state, determination means (processor 103) which determines an application voltage value that the power supply device 120 should apply to the imaging apparatus 100 in the first power supply state, and instruction means (processor 103) which instructs the power supply device 120 to supply power at the application voltage value which is determined by the determination means.SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] One of the well-known USB standards is the USB TYPE-C standard, which is a standard for connectors that connect electronic devices together via a cable. Connectors that comply with the USB TYPE-C standard can be used for data communication between electronic devices, as well as for supplying power from one electronic device to another. The USB PD (Power Delivery) standard, which is a method of power supply in the USB standard, allows electronic devices that comply with the USB PD standard to send and receive information about power supply. Power is then supplied according to a power supply profile that is compatible with both devices.

[0003] In recent years, power supply devices for information processing devices such as smartphones and PCs have been shifting to comply with the USB PD standard. In particular, USB PD 3.0, the most widely supported standard among USB PD standards, offers two main power supply modes: PDO (Power Data Object) and PPS (Programmable Power Supply). PDO allows for relatively large changes in the amount of power supplied. In contrast, PPS allows for smaller changes in the amount of power supplied, and can even vary the amount of power supplied while the information processing device is in operation. Comparing these two features, PDO tends to supply more power than is required, while PPS tends to provide a more consistent supply.

[0004] For example, it is expected that digital video cameras will also support the USB PD standard in the future. Digital video cameras have a main unit that captures images of a subject and records them on a recording medium, and a display unit that displays the captured images and setting menus. The main unit is connected to a power supply device, such as a battery or a power adapter, that supplies power. The power consumption of the main unit varies depending on settings such as the shooting mode. Therefore, the power consumption value may be equal to the supplied power value, or there may be a slight difference between the power consumption value and the supplied power value. For example, if the power consumption value is significantly lower than the supplied power value, some power may be wasted. In such cases, using PPS can enable efficient power supply, i.e., avoiding wasted power consumption, by adjusting the supplied power to match the power consumption according to the settings while the digital video camera is operating.

[0005] Patent Document 1 describes a power control device that controls power supply according to the load state within a communication device. The power control device has multiple power supply modules that adjust power, and selects and operates a power supply module for each operating mode of the power control device. The power control device can also supply power at a minimum power value to power supply modules that do not require power supply. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-5534 Summary of the Invention [Problem to be solved by the invention]

[0007] However, with the power control device described in Patent Document 1, if there are a relatively large number of different power consumption setting values, for example, the number of power supply modules must be increased to accommodate each setting. As a result, the device configuration becomes more complex and the manufacturing costs of the device increase. Furthermore, unlike PDO, PPS changes the voltage value in small increments, so it takes time for the supply voltage value to completely transition to the required value after the setting is changed, causing the user to wait for that time.

[0008] The present invention has been made in consideration of the above-mentioned problems. It is an object of the present invention to provide an electronic device that can easily adapt to changed operating conditions when the operating conditions of the electronic device are changed, and can minimize the waiting time during which the user is unable to operate the electronic device. Similarly, it is an object of the present invention to provide a control method and program for an electronic device that can easily adapt to changed operating conditions when the operating conditions of the electronic device are changed, and can minimize the waiting time during which the user is unable to operate the electronic device. [Means for solving the problem]

[0009] In order to achieve the above object, the electronic device of the present invention is an electronic device that is connected to a power supply device capable of supplying power compliant with the USB PD standard, and can be in a first power supply state in which power is supplied from the power supply device, and a second power supply state in which a built-in battery is built in and power is supplied from the built-in battery, and includes a display means for displaying a setting screen on which operating conditions of the electronic device can be set, an acquisition means for acquiring a power consumption value consumed by the electronic device according to the operating conditions, a switching means for switching between the first power supply state and the second power supply state, a determination means for determining an applied voltage value to be applied by the power supply device to the electronic device in the first power supply state, and a voltage determined by the determination means. and an instruction means for instructing the power supply device to supply power at the applied voltage value, wherein when the operating conditions on the setting screen are changed in the first power supply state, the switching means is capable of switching the first power supply state to the second power supply state, and during the second power supply state, the acquisition means acquires the power consumption value under the operating conditions changed on the setting screen, the determination means determines the applied voltage value based on the power consumption value acquired by the acquisition means, and the instruction means instructs the power supply device to supply power at the applied voltage value determined by the determination means. [Effects of the Invention]

[0010] According to the present invention, when the operating conditions of an electronic device are changed, the electronic device can easily adapt to the changed operating conditions, and the waiting time during which the user is unable to operate the electronic device can be shortened as much as possible. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a block diagram showing an example of a hardware configuration when the electronic device according to the first embodiment is applied to an imaging device. [Figure 2] FIG. 2 is a block diagram showing an example of the hardware configuration of a USB unit and a power supply device of the imaging device. [Figure 3] 10 is a flowchart illustrating a process executed by the imaging device. [Figure 4]10A to 10C are diagrams illustrating an example of transition of screens displayed on a display panel of the imaging device. [Figure 5] 10 is a flowchart showing processing executed by the imaging device according to the second embodiment. [Figure 6] 10 is a flowchart showing processing executed by an imaging device according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Each embodiment of the present invention will be described in detail below with reference to the drawings. However, the configurations described in each of the following embodiments are merely examples, and the scope of the present invention is not limited to the configurations described in each embodiment. For example, each component constituting the present invention can be replaced with any configuration that can perform the same function. Also, any component may be added. Furthermore, any two or more configurations (features) of each embodiment can be combined.

[0013] First Embodiment A first embodiment will be described below with reference to FIGS. 1 to 4. FIG. 1 is a block diagram showing an example of a hardware configuration when an electronic device according to the first embodiment is applied to an imaging device. The imaging device 100 shown in FIG. 1 is a digital video camera capable of capturing moving images and still images. The imaging device 100 includes a lens unit 101, an imaging element 102, a processor 103, a memory (storage means) 104, a recording medium (storage medium) 105, a UI (User Interface) unit 106, and a display panel (display means) 107. The imaging device 100 also includes a USB unit 108, a power supply circuit 109, an internal battery 110, and a temperature sensor 111. The lens unit 101 forms an optical image of a subject on the imaging surface of the imaging element 102. The imaging element 102 generates image data from the optical image formed on the imaging surface. The processor 103 is a control unit (computer) that controls the overall operation of the imaging device 100. The processor 103 can process image data generated by the image sensor 102, for example, by performing predetermined image processing and predetermined encoding processing. The image data processed by the processor 103 is recorded on a recording medium 105 or displayed on a display panel 107. When controlling the overall operation of the image capture device 100, the processor 103 executes a program stored in the memory 104. The program includes, for example, a program for causing the processor 103 to execute each unit and each means (a control method for an electronic device) of the image capture device 100.

[0014] The USB unit 108 is configured in compliance with the USB standard, USB Type-C standard, USB PD standard, etc., and is connected to a power supply device (power supply equipment) 120 that is also in compliance with the same standards. This allows the imaging device 100 (consumer) to transmit and receive data to and from the power supply device 120, and to receive power from the power supply device 120 (provider). The power supply device 120 is not particularly limited, and may be, for example, a desktop or laptop personal computer. The memory 104 pre-stores the programs and various data. The various data is not particularly limited, and may include, for example, data related to multiple operation modes (operating conditions) that can be set in the imaging device 100, data related to power consumption levels for each operation mode, etc. There are multiple operation modes, such as an "imaging mode" for capturing images such as moving images and still images, a "playback mode" for playing back images captured in the operation mode, and a "data transfer mode" for transferring image data stored in the recording medium 105 to the power supply device 120. In this embodiment, information regarding the power consumption values ​​required for operation in each operation mode is stored in advance in the memory 104. Image data encoded by the processor 103 is stored in the recording medium 105. The recording medium 105 is not particularly limited, and for example, a memory card such as an SD card that is detachably attached to the imaging device 100 can be used.

[0015] The UI unit 106 is a user interface used by the user when operating the imaging device 100. The UI unit 106 is not particularly limited, and examples thereof include a touch panel mounted on the display panel 107 and mechanical buttons. The display panel 107 is configured, for example, with a liquid crystal display and can display various screens and images (display process). The screen is not particularly limited, and examples thereof include a setting screen that allows the user to set and change the operation mode of the imaging device 100. The images are not particularly limited, and examples thereof include videos and still images captured by the imaging device 100. The built-in battery 110 is a power source that supplies power for operating the imaging device 100. The built-in battery 110 is not particularly limited, and examples thereof include a lithium-ion battery detachably built into the imaging device 100. The power supply circuit 109 converts voltage supplied from the power supply device 120 via the USB unit 108 or power supplied from the built-in battery 110 into power usable by each component, such as the lens unit 101, the image sensor 102, and the processor 103. Hereinafter, the power supply state in which power is supplied from the power supply device 120 will be referred to as the "first power supply state," and the power supply state in which power is supplied from the built-in battery 110 will be referred to as the "second power supply state." The image capture device 100 can be in the first power supply state or the second power supply state, and can switch to one of these two power supply states (switching process). In the image capture device 100, the power supply circuit 109 switches between the first power supply state and the second power supply state. In this manner, in this embodiment, the power supply circuit 109 functions as a switching means for switching the power supply state. The temperature sensor 111 is formed of, for example, a thermistor, and detects the temperature of the image capture element 102 connected to the processor 103, etc.

[0016] 2 is a block diagram showing an example of the hardware configuration of a USB unit and a power supply device of an imaging device. As shown in FIG. 2, the USB unit 108 of the imaging device 100 and the power supply device 120 are connected to each other via a USB cable 202. The USB unit 108 has a voltage control unit 201, a USB connector 203, and a power receiving circuit 204. The power receiving circuit 204 has a voltage conversion circuit 205 and a communication interface 206. The USB connector 203 is a connector connected to the USB cable 202. The USB connector 203 has D+ / D- terminals and SS+ / SS- (SuperSPEED) terminals for data communication lines, a GND terminal (not shown) for a GND signal, a VBUS terminal for a power supply line, a CC terminal, etc. The CC terminal is a terminal compliant with the USB Type-C standard and the USB PD standard and is used for power supply compliant with the USB PD standard.

[0017] The power supply device 120 includes a power supply circuit 211, a communication interface 212, and a processor 213. Power supply modes include PDO (Power Data Object) and PPS (Programmable Power Supply). PDO allows for relatively large changes in the amount of power supplied. On the other hand, PPS allows for smaller changes in the amount of power supplied than PDO, and can also vary the amount of power supplied while the imaging device 100 is in operation. In this embodiment, PPS is adopted as the power supply mode for the power supply device 120.

[0018] As described above, the power receiving circuit 204 includes a voltage conversion circuit 205 and a communication interface 206. When power is supplied from the power supply device 120, i.e., in the first power supply state, a voltage is applied to the voltage conversion circuit 205 from the power supply circuit 211 of the power supply device 120 via the VBUS terminal of the USB connector 203. The voltage conversion circuit 205 converts the voltage applied from the power supply circuit 211 into a system voltage of the imaging device 100 and applies the system voltage to the power supply circuit 109. The power supply circuit 109 converts the system voltage applied from the voltage conversion circuit 205 into a voltage usable by each component, such as the processor 103. The communication interface 206 is connected to the communication interface 212 of the power supply device 120 via the CC terminal of the USB connector 203. Under the control of the processor 103, the communication interface 206 adjusts the value of the voltage applied from the power supply device 120 to the imaging device 100, etc. In a power supply compliant with the USB PD standard, the power supply circuit 211 of the power supply device 120 can supply, for example, power ranging from 10 W (5 V, 2 A) to 100 W (20 V, 5 A) to the voltage conversion circuit 205 of the imaging device 100 via the VBUS terminal.

[0019] Next, a process up to the start of power supply conforming to the USB PD standard will be described. When the imaging device 100 is connected to the power supply device 120 via the USB cable 202, the voltage of the CC terminal, which is determined by a pull-down resistor (not shown) in the imaging device 100 and a pull-up resistor (not shown) in the power supply device 120, is detected. The processor 103 of the imaging device 100 determines, based on the voltage of the CC terminal, whether the power supply device 120 is a device that supplies standard power (e.g., 5 V, 500 mA) conforming to the USB PD standard. If the processor 103 determines that the power supply device 120 is a device that supplies standard power, the processor 103 starts up the imaging device 100 with the standard power conforming to the USB PD standard. The processor 103 of the imaging device 100 exchanges information regarding power supply conforming to the USB PD standard with the power supply device 120 via the CC terminal, and sets a combination of a voltage value (applied voltage value) and a current value that can supply the power. Furthermore, during this setting, for example, the processor 103 of the imaging device 100 requests a power supply capacity (a combination of a voltage value and a current value that can supply power) that complies with the USB PD standard from the processor 213 of the power supply device 120. In response to the request from the imaging device 100, the processor 213 of the power supply device 120 replies with a power supply capacity that complies with the USB PD standard.

[0020] The processor 103 of the imaging device 100 determines whether a desired combination of voltage and current values ​​is found among the power supply capacities returned from the power supply device 120. That is, the processor 103 determines whether the power supply device 120 can determine the voltage and current values ​​to be applied to the imaging device 100. If the processor 103 determines that the desired combination of voltage and current values ​​is found, the processor 103 performs the following process. This process is a process of transmitting voltage and current information (supply power setting information) related to the combination of voltage and current values ​​to the communication interface 212 of the power supply device 120 via the communication interface 208. This allows the processor 103 to instruct the power supply device 120 to supply power based on the voltage and current information. The power supply device 120 receives the voltage and current information via the communication interface 212. The processor 213 of the power supply device 120 performs a step-up process to increase the voltage or a step-down process to decrease the voltage in the power supply circuit 211 based on the voltage and current information. The processor 213 of the power supply device 120 supplies the desired power obtained by combining the voltage value and current value to the image capture device 100 via the VBUS terminal. This allows the image capture device 100 to enter a state in which the system can operate after starting up with standard power. Note that if the processor 103 determines whether or not the desired combination of voltage value and current value exists, and determines that the desired combination of voltage value and current value does not exist, the processor 103 stops supplying power in accordance with the USB PD standard.

[0021] As described above, the imaging device 100 can set a voltage value required for supplying power in compliance with the USB PD standard through communication with the power supply device 120. For example, when the power supply mode is PDO, the voltage value can be 5V, 9V, 12V, 15V, 20V, etc. Furthermore, when the power supply mode is PPS, the voltage value can be changed in 20mV increments. In the first power supply state, the voltage conversion circuit 205 converts the power applied from the power supply device 120 into a system voltage (e.g., 5V) required for system operation. Meanwhile, in the second power supply state, if the internal battery 110 is configured as, for example, a two-cell lithium-ion battery, the voltage conversion circuit 205 converts the applied voltage of approximately 8.4V from the two-cell lithium-ion battery into the system voltage. Furthermore, in the second power supply state, if the internal battery 110 is configured as, for example, a four-cell lithium-ion battery, the voltage conversion circuit 205 converts the applied voltage of approximately 16.8V from the four-cell lithium-ion battery into the system voltage.

[0022] As shown in FIG. 2, the voltage conversion circuit 205 includes a boost circuit 205a and a step-down circuit 205b. The boost circuit 205a performs a step-up process to increase the voltage, and the step-down circuit 205b performs a step-down process to decrease the voltage. Both the boost circuit 205a and the step-down circuit 205b convert (change) voltage, but generally, the boost circuit 205a tends to have a larger voltage conversion loss when converting voltage than the step-down circuit 205b. The voltage conversion circuit 205 including the boost circuit 205a and the step-down circuit 205b operates by switching between step-up and step-down modes depending on the input voltage or load current. Furthermore, the greater the voltage difference between the input voltage and the output voltage of the voltage conversion circuit 205, the greater the voltage conversion loss, i.e., the worse the voltage conversion efficiency. The voltage conversion circuit 205 generates heat due to the voltage conversion loss. Therefore, if the voltage conversion loss increases, the temperature inside the imaging device 100 may rise, potentially causing the processor 103, the image sensor 102, and the like to stop operating. The voltage conversion circuit 205 can reduce the voltage conversion loss by receiving a voltage from the power supply device 120 that is as close as possible to the system voltage but higher than the system voltage. However, if the applied voltage is set to minimize the voltage conversion loss in the voltage conversion circuit 205, the functionality of the power supply device 120 may be limited, potentially reducing the versatility of the power supply device 120. Furthermore, when the operation mode of the imaging device 100 is changed, a waiting time may occur until the applied voltage value appropriate for that operation mode is reached. As a result, for example, there may be a period of time when the device is unavailable for operation, or the state of the changed operation mode may be reflected with a delay, causing the user to wait for an operation.

[0023] Therefore, the imaging device 100 is configured to be able to reduce such a phenomenon. The configuration and operation will be described below. FIG. 3 is a flowchart showing processing executed by the imaging device. As shown in FIG. 3, in step S301, the processor 103 of the imaging device 100 displays a setting screen for an imaging mode (hereinafter may be simply referred to as a "setting screen") on the display panel 107. At this time, the imaging device 100 is in the first power supply state. Then, while remaining in the first power supply state, the processor 103 determines whether or not the operating conditions of the imaging mode on the setting screen have been changed.

[0024] As described above, the imaging device 100 can be set to a plurality of operating modes. The "setting screen for imaging mode" refers to a setting screen on which, for example, operating conditions for each imaging mode can be set. Displaying the setting screen and changing the operating conditions are performed by operating the UI unit 106. The determination in step S301 will be described with reference to FIG. 4. FIG. 4 illustrates an example of transitions between screens displayed on the display panel of the imaging device. Screen 401 shown in FIG. 4(a) is an example of an image of one frame of a video. Screen 402 shown in FIG. 4(b) is a setting screen switched from screen 401. This screen 402 includes operating conditions for a video mode in which a video is captured. The operating conditions include, for example, the video frame rate, the video resolution, and the output format for outputting the video. Screen 403 shown in FIG. 4(c) is a setting screen showing a state in which at least one of the operating conditions of screen 402, i.e., at least one of the video frame rate, the video resolution, and the output format for outputting the video, has been changed. The frame rate, resolution, and output format of this screen 403 have been changed compared to the screen 402. Whether or not the operating conditions of the image capture mode on the setting screen have been changed is determined based on whether or not the screens transition in this order from the screen 401 to the screen 402 to the screen 403, and then the screen 403 is closed and the screen returns to the screen 401. Therefore, if the screens transition in this order from the screen 401 to the screen 402 to the screen 403, and then the screen 403 is closed and the screen returns to the screen 401, it is determined that the operating conditions of the image capture mode on the setting screen have been changed. On the other hand, if the screens transition in this order from the screen 401 to the screen 402, and then the screen 402 is closed and the screen returns to the screen 401, it is determined that the operating conditions of the image capture mode on the setting screen have not been changed.

[0025] If the processor 103 determines in step S301 that the operating conditions of the imaging mode have changed in the first power supply state, the process proceeds to step S302. On the other hand, if the processor 103 determines in step S301 that the operating conditions of the imaging mode have not changed in the first power supply state, the process ends.

[0026] In step S302, the processor 103 controls the power supply circuit 109 to switch from the first power supply state to the second power supply state, that is, to switch the main power source from the power supply device 120 to the built-in battery 110. This second power supply state is maintained until step S307.

[0027] In step S303, the processor 103 detects the details of the change when it is determined in step S301 that the operating conditions of the imaging mode have been changed.

[0028] In step S304, the processor 103 calculates and acquires the power consumption value consumed by the imaging device 100 (acquisition step). This power consumption value is the power consumption value for the changes detected in step S303, i.e., the power consumption value according to the changed operating conditions. As described above, in this embodiment, information regarding the power consumption value required for operation in each operating mode is pre-stored in the memory 104. The processor 103 acquires from the memory 104 the power consumption value when the frame rate in the imaging mode is changed, the power consumption value when the resolution is changed, and the power consumption value when the output format is changed, and adds these values ​​together. The processor 103 then sets the sum as the power consumption value in step S304. In this way, in this embodiment, the processor 103 functions as an acquisition unit that acquires the power consumption value. Note that in the imaging device 100, a unit that functions as an acquisition unit may be provided separately from the processor 103.

[0029] In step S305, the processor 103 determines an applied voltage value to be applied to the imaging device 100 by the power supply device 120 based on the power consumption value acquired in step S304 so that the imaging device 100 operates under the changed operating conditions in the first power supply state (determination step). For example, if the power consumption value is calculated to be 10 W, the applied voltage value is determined to be 5 V. The applied voltage value is preferably determined to be a voltage value that minimizes power loss in the imaging device 100. The applied voltage value is preferably determined to be a value that adds a margin to the overall power consumption value according to the changed operating conditions. As described above, in this embodiment, the processor 103 functions as a determination unit that determines the applied voltage value. Note that, in the imaging device 100, a unit that functions as a determination unit may be provided separately from the processor 103. Note that, it is preferable that a table or graph showing the relationship between power consumption value and applied voltage value is stored in advance in the memory 104. In this case, the processor 103 can quickly determine the applied voltage value based on the table or graph. If the operating conditions have not been changed, the applied voltage value determined before step S301 is used as is.

[0030] In step S306, the processor 103 instructs the power supply device 120 to supply power at the applied voltage value determined in step S305, via the voltage control unit 201 of the USB unit 108 and the communication interface 212 in that order (instruction step). In this manner, in this embodiment, the processor 103 functions as an instruction unit that instructs the supply of power at the applied voltage value. Note that in the imaging device 100, a section that functions as an instruction unit may be provided separately from the processor 103.

[0031] In step S307, the processor 103 determines, in accordance with the instruction in step S306, whether the power supply device 120 is ready to supply power at the applied voltage value determined in step S305. This determination is made, for example, based on whether information indicating that the power supply device 120 is ready to supply power is transmitted from the power supply device 120 and received by the processor 103. If the processor 103 receives this information, it is determined that the power supply device 120 is ready to supply power. On the other hand, if the processor 103 does not receive this information, it is determined that the power supply device 120 is not ready to supply power. In this manner, in this embodiment, the processor 103 functions as a determination unit that determines whether the power supply device 120 is ready to supply power. Note that in the imaging device 100, a unit that functions as a determination unit may be provided separately from the processor 103. Also, the determination unit may be omitted in the imaging device 100. In this case, the processor 103 may consider that the power supply device 120 has become capable of supplying power after a predetermined time has elapsed since the instruction was issued in step S306. Then, if the processor 103 determines in step S307 that the power supply device 120 has become capable of supplying power, the process proceeds to step S308. On the other hand, if the processor 103 determines in step S307 that the power supply device 120 has not become capable of supplying power, the process remains in step S307 and waits.

[0032] In step S308, the processor 103 controls the power supply circuit 109 to switch from the second power supply state to the first power supply state, i.e., to switch the main power source from the built-in battery 110 to the power supply device 120. In this first power supply state, the imaging device 100 can easily operate under the changed operating conditions. After step S308 is executed, the processing ends.

[0033] Through the above-described control, when the operation mode is changed, for example, the imaging device 100 can instruct the power supply device 120 to supply power at an applied voltage value with a margin added. Thereafter, the imaging device 100 can perform a step-down process using the step-down circuit 205b, thereby reducing voltage conversion loss. Furthermore, power is quickly supplied from the power supply device 120 to the imaging device 100 at the applied voltage value determined in step S305. This power supply can minimize the waiting time during which the user is unable to operate the imaging device 100.

[0034] Second Embodiment The second embodiment will be described below with reference to FIG. 5. However, differences from the previously described embodiment will be mainly described, and similar matters will not be described again. FIG. 5 is a flowchart showing processing executed by an imaging device according to the second embodiment. As shown in FIG. 5, in step S501, similar to step S301, the processor 103 of the imaging device 100 displays a setting screen for an imaging mode on the display panel 107 and determines whether the operating conditions of the imaging mode on the setting screen have been changed. If the processor 103 determines in step S501 that the operating conditions of the imaging mode have been changed, the processing proceeds sequentially to steps S502 to S504. Steps S502 to S504 are similar to steps S303 to S305, respectively. On the other hand, if the processor 103 determines in step S501 that the operating conditions of the imaging mode have not been changed, the processing ends.

[0035] In step S505, the processor 103 determines whether the difference between the applied voltage value determined in step S504, i.e., the applied voltage value when the operating conditions are changed, and the applied voltage value before the operating conditions are changed, is less than a threshold value. In this embodiment, the processor 103 determines whether the applied voltage value when the operating conditions are changed is the same as the applied voltage value before the operating conditions are changed, or whether it is lower than the applied voltage value before the operating conditions are changed. If the processor 103 determines in step S505 that the applied voltage value when the operating conditions are changed is lower (or the same) than the applied voltage value before the operating conditions are changed, the process proceeds to step S510. On the other hand, if the processor 103 determines in step S505 that the applied voltage value when the operating conditions are changed is not lower (or not the same) than the applied voltage value before the operating conditions are changed, the process proceeds to step S506.

[0036] In step S506, the processor 103 controls the power supply circuit 109 to switch from the first power supply state to the second power supply state, which is maintained until step S307.

[0037] In step S507, the processor 103 increases the applied voltage value determined in step S504 so that the imaging device 100 operates under the changed operating conditions in the first power supply state, and instructs the power supply device 120 to supply power at the increased voltage value. After step S507 is performed, the process proceeds to steps S508 and S509 in this order. Steps S508 and S509 are similar to steps S307 and S308, respectively.

[0038] In step S510, the processor 103 decreases the applied voltage value determined in step S504 so that the image capture device 100 operates under the changed operating conditions in the first power supply state, and instructs the power supply device 120 to supply power at the decreased voltage value. At this time, the image capture device 100 remains in the first power supply state. After step S510 is executed, the processing ends.

[0039] Through the above control, the first power supply state is maintained in the image capture device 100 when the difference between the applied voltage value when the operating conditions are changed in the first power supply state and the applied voltage value before the operating conditions are changed is less than a threshold value. For example, if the applied voltage value is lowered by switching to the second power supply state, power from the built-in battery 110 will be wasted. However, as described above, by maintaining the first power supply state, it is possible to suppress wasted power consumption from the built-in battery 110.

[0040] Third Embodiment The third embodiment will be described below with reference to Fig. 6, focusing on differences from the previously described embodiments, and a description of similar matters will be omitted. Fig. 6 is a flowchart showing processing executed by an imaging device according to the third embodiment. As shown in Fig. 6, the processing proceeds in order from step S601 to step S604. Steps S601 to S604 are the same as steps S501 to S504. After step S604 is executed, the processing proceeds to step S605.

[0041] In step S605, the processor 103 of the imaging device 100 determines whether the applied voltage value determined in step S604 is higher than the applied voltage value before the operating conditions were changed, for example, by 500 mV. If the processor 103 determines in step S605 that the applied voltage value determined in step S604 is higher than the applied voltage value before the operating conditions were changed, the process proceeds to steps S606 to S609 in order. Steps S606 to S609 are the same as steps S506 to S509, respectively. On the other hand, if the processor 103 determines in step S605 that the applied voltage value determined in step S604 is not higher than the applied voltage value before the operating conditions were changed, the process proceeds to step S610.

[0042] In step S610, the processor 103 changes the applied voltage value determined in step S604 so that the image capture device 100 operates under the changed operating conditions in the first power supply state, and instructs the power supply device 120 to supply power at the changed voltage value. At this time, the image capture device 100 remains in the first power supply state. After step S610 is executed, the processing ends.

[0043] Through the above-described control, the image capture device 100 maintains the first power supply state if the applied voltage value when the operating conditions are changed in the first power supply state is lower (smaller) than the applied voltage value before the operating conditions were changed. In this embodiment, as in the second embodiment, switching to the second power supply state when lowering the applied voltage value, for example, would waste power from the built-in battery 110. However, maintaining the first power supply state can prevent this wasteful power consumption. The determination criterion (threshold) in step S605 is 500 mV, but is not limited to this. 500 mV is the result of comparing the standard value of the PPS transition time with the basic TAT (turnaround time) time of the video camera. The PPS transition time is specified as 0 ms to 25 ms when the PPS transition time is 500 mV or less, and 25 ms to 275 ms when the PPS transition time is 500 mV or less, and 25 ms to 275 ms when the PPS transition time is 500 mV or more. On the other hand, if the TAT time of the video camera is defined as the time from when the menu is set to when the setting is actually reflected, then, for example, 32 ms, which is equivalent to two cycles based on the system frequency, can be used. In this case, when the transition is 500 mV or less, the TAT time exceeds the transition time, so the waiting time for the user is not considered to be so long that the user is bothered by it.

[0044] Although preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and various modifications and variations are possible within the spirit and scope of the present invention. The present invention can 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. The present invention can also be realized by a process in which one or more general-purpose processors (ASICs) in the computer of the system or device read and execute the program. The present invention can also be realized by a dedicated processor (e.g., an ASIC or FPGA) that realizes one or more functions. Furthermore, the present invention can also be realized by a combination of a general-purpose processor and a dedicated processor. The term "processor" used here refers to a processor in a broad sense and includes both general-purpose processors and dedicated processors. Furthermore, the process that realizes the present invention may be performed by a single processor alone, or may be performed by multiple processors located in physically separate locations in cooperation with each other.

[0045] The disclosure of each embodiment includes the following configurations, methods, and programs. (Configuration 1) An electronic device that is connected to a power supply device capable of supplying power in accordance with the USB PD standard and can assume a first power supply state in which power is supplied from the power supply device, and a second power supply state in which an internal battery is built in and power is supplied from the internal battery, a display means for displaying a setting screen on which the operating conditions of the electronic device can be set; an acquisition means for acquiring a power consumption value consumed by the electronic device according to the operating conditions; a switching means for switching between the first power supply state and the second power supply state; a determination unit that determines an applied voltage value to be applied to the electronic device by the power supply device in the first power supply state; an instruction unit that instructs the power supply device to supply power at the applied voltage value determined by the determination unit, When the operating conditions on the setting screen are changed in the first power supply state, the switching means is capable of switching the first power supply state to the second power supply state, and during the second power supply state, the acquisition means acquires the power consumption value under the operating conditions changed on the setting screen, the determination means determines the applied voltage value based on the power consumption value acquired by the acquisition means, and the instruction means instructs the power supply equipment to supply power at the applied voltage value determined by the determination means. (Configuration 2) The electronic device described in Configuration 1, characterized in that when the power supply device is in a state where it can supply power at the applied voltage value determined by the determination means in response to an instruction from the instruction means, the switching means switches the second power supply state to the first power supply state. (Configuration 3) The electronic device according to configuration 2, characterized in that when the electronic device is switched to the first power supply state by the switching means, it becomes possible to operate under the operating conditions changed on the setting screen. (Configuration 4) The electronic device according to configuration 2, wherein the power supply device includes a determination means for determining whether or not the power supply device is in a state where it can supply power at the applied voltage value determined by the determination means. (Configuration 5) The electronic device is an imaging device capable of capturing moving images, The electronic device according to any one of configurations 1 to 4, wherein the setting screen allows the user to set the operating conditions, such as a frame rate of the video, a resolution of the video, and an output format for outputting the video. (Configuration 6) The electronic device according to Configuration 5, wherein the switching means switches the first power supply state to the second power supply state when at least one setting of the frame rate of the video, the resolution of the video, and the output format for outputting the video is changed. (Configuration 7) There are a plurality of types of operating conditions, the electronic device includes a storage unit that stores in advance the power consumption value for each of the operating conditions; 7. The electronic device according to any one of configurations 1 to 6, wherein the acquisition means acquires the power consumption value for each of the operating conditions from the storage means. (Configuration 8) There are a plurality of types of operating conditions, the electronic device includes a storage unit that stores in advance the power consumption value for each of the operating conditions; the acquiring means adds up the power consumption values ​​each time the operating conditions are changed; 8. The electronic device according to any one of configurations 1 to 7, wherein the determining means determines the applied voltage value based on the power consumption value added up by the obtaining means. (Configuration 9) The storage means stores in advance a table or graph showing the relationship between the power consumption value and the applied voltage value, 9. The electronic device according to configuration 7 or 8, wherein the determining means determines the applied voltage value based on the table or the graph. (Configuration 10) An electronic device described in any one of configurations 1 to 9, characterized in that, when a difference between the applied voltage value when the operating conditions on the setting screen are changed in the first power supply state and the applied voltage value before the operating conditions are changed is less than a threshold value, the switching means maintains the first power supply state, the acquisition means acquires the power consumption value under the operating conditions changed on the setting screen, the determination means determines the applied voltage value based on the power consumption value acquired by the acquisition means, and the instruction means instructs the power supply equipment to supply power at the applied voltage value determined by the determination means. (Configuration 11) An electronic device described in any one of configurations 1 to 10, characterized in that, when the applied voltage value when the operating conditions on the setting screen are changed in the first power supply state is smaller than the applied voltage value before the operating conditions were changed, the switching means maintains the first power supply state, the acquisition means acquires the power consumption value under the operating conditions changed on the setting screen, the determination means determines the applied voltage value based on the power consumption value acquired by the acquisition means, and the instruction means instructs the power supply equipment to supply power at the applied voltage value determined by the determination means. (Method 1) A method for controlling an electronic device that is connected to a power supply device capable of supplying power in accordance with the USB PD standard and can be in a first power supply state in which power is supplied from the power supply device, and that has a built-in battery and can be in a second power supply state in which power is supplied from the built-in battery, a display step of displaying a setting screen on which operating conditions of the electronic device can be set; an acquisition step of acquiring a power consumption value consumed by the electronic device according to the operating conditions; a switching step of switching between the first power supply state and the second power supply state; a determination step of determining an applied voltage value to be applied to the electronic device by the power supply device in the first power supply state; an instruction step of instructing the power supply device to supply power at the applied voltage value determined in the determination step, a switching step of switching the first power supply state to the second power supply state when the operating conditions on the setting screen are changed in the first power supply state, and during the second power supply state, the acquisition step of acquiring the power consumption value under the operating conditions changed on the setting screen, the determination step of determining the applied voltage value based on the power consumption value acquired in the acquisition step, and the instruction step of instructing the power supply device to supply power at the applied voltage value determined in the determination step. (Program 1) A program for causing a computer to execute each means of the electronic device described in any one of configurations 1 to 11. [Explanation of symbols]

[0046] 100 Imaging device 103 processors 104 memory 109 Power supply circuit 110 Built-in battery 120 Power Supply Device

Claims

1. An electronic device that is connected to a power supply device capable of supplying power in accordance with the USB PD standard and can assume a first power supply state in which power is supplied from the power supply device, and a second power supply state in which a built-in battery is incorporated and power is supplied from the built-in battery, a display means for displaying a setting screen on which the operating conditions of the electronic device can be set; an acquisition means for acquiring a power consumption value consumed by the electronic device according to the operating conditions; a switching means for switching between the first power supply state and the second power supply state; a determination unit that determines an applied voltage value to be applied to the electronic device by the power supply device in the first power supply state; an instruction unit that instructs the power supply device to supply power at the applied voltage value determined by the determination unit, When the operating conditions on the setting screen are changed in the first power supply state, the switching means is capable of switching the first power supply state to the second power supply state, and during the second power supply state, the acquisition means acquires the power consumption value under the operating conditions changed on the setting screen, the determination means determines the applied voltage value based on the power consumption value acquired by the acquisition means, and the instruction means instructs the power supply equipment to supply power at the applied voltage value determined by the determination means.

2. 2. The electronic device according to claim 1, wherein when the instruction from the instruction means causes the power supply device to be in a state capable of supplying power at the applied voltage value determined by the determination means, the switching means switches from the second power supply state to the first power supply state.

3. 3. The electronic device according to claim 2, wherein when the electronic device is switched to the first power supply state by the switching means, the electronic device is able to operate under the operating conditions changed on the setting screen.

4. 3. The electronic device according to claim 2, further comprising a determination unit that determines whether the power supply device is in a state where it can supply power at the applied voltage value determined by the determination unit.

5. the electronic device is an imaging device capable of capturing video; 2. The electronic device according to claim 1, wherein the setting screen allows the user to set the frame rate of the video, the resolution of the video, and an output format for outputting the video as the operating conditions.

6. The electronic device according to claim 5, characterized in that the switching means switches from the first power supply state to the second power supply state when at least one setting of the frame rate of the video, the resolution of the video, and the output format for outputting the video is changed.

7. There are a plurality of types of operating conditions, the electronic device includes a storage unit that stores in advance the power consumption value for each of the operating conditions; The electronic device according to claim 1 , wherein the acquisition unit acquires the power consumption value for each of the operating conditions from the storage unit.

8. There are a plurality of types of operating conditions, the electronic device includes a storage unit that stores in advance the power consumption value for each of the operating conditions; the acquiring means adds up the power consumption values ​​each time the operating conditions are changed; The electronic device according to claim 1 , wherein the determining unit determines the applied voltage value based on the power consumption value added up by the obtaining unit.

9. the storage means stores in advance a table or graph showing the relationship between the power consumption value and the applied voltage value; 9. The electronic device according to claim 7, wherein the determining unit determines the applied voltage value based on the table or the graph.

10. 2. The electronic device according to claim 1, wherein, when a difference between the applied voltage value when the operating conditions on the setting screen are changed in the first power supply state and the applied voltage value before the operating conditions are changed is less than a threshold value, the switching means maintains the first power supply state, the acquisition means acquires the power consumption value under the operating conditions changed on the setting screen, the determination means determines the applied voltage value based on the power consumption value acquired by the acquisition means, and the instruction means instructs the power supply device to supply power at the applied voltage value determined by the determination means.

11. 2. The electronic device according to claim 1, wherein, when the applied voltage value when the operating conditions on the setting screen are changed in the first power supply state is smaller than the applied voltage value before the operating conditions were changed, the switching means maintains the first power supply state, the acquisition means acquires the power consumption value under the operating conditions changed on the setting screen, the determination means determines the applied voltage value based on the power consumption value acquired by the acquisition means, and the instruction means instructs the power supply device to supply power at the applied voltage value determined by the determination means.

12. A method for controlling an electronic device that is connected to a power supply device capable of supplying power in accordance with the USB PD standard and that can assume a first power supply state in which power is supplied from the power supply device, and that has a built-in battery and that can assume a second power supply state in which power is supplied from the built-in battery, comprising: a display step of displaying a setting screen on which operating conditions of the electronic device can be set; an acquisition step of acquiring a power consumption value consumed by the electronic device according to the operating conditions; a switching step of switching between the first power supply state and the second power supply state; a determination step of determining an applied voltage value to be applied to the electronic device by the power supply device in the first power supply state; an instruction step of instructing the power supply device to supply power at the applied voltage value determined in the determination step, a power supply device that supplies power to the power supply equipment at the applied voltage value determined in the determination step; and a power supply device that supplies power to the power supply equipment at the applied voltage value determined in the determination step.

13. A program for causing a computer to execute each means of the electronic device according to claim 1.

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