Electronic device and control method

Abstract

To efficiently use the ability of an external power supply, and not impair the operation performance of an electronic apparatus as much as possible.SOLUTION: An electronic apparatus has: first conversion means that performs voltage conversion of a voltage supplied from an external device into an integral submultiple by using a capacitor, and converts a current supplied from the external device into a reciprocal multiple of the integral submultiple; a bypass switch that is connected in parallel with the first conversion means, and outputs a power supplied from the external device while bypassing the first conversion means; control means that controls the bypass switch and the first conversion means; determination means that determines the power supply ability of the external device; and calculation means that, based on power consumption information on a plurality of operation modes that can be set to the electronic apparatus, calculates the voltage and current required for the operation in a set operation mode. The control means controls the bypass switch and the first conversion means to obtain the voltage and current required for the operation based on the power supply ability.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an electronic device having a switched capacitor and a control method thereof. [Background technology]

[0002] Patent Document 1 describes a converter having a switched capacitor, in which a predetermined output voltage is set for each mode of an electronic device, and the output voltage is changed according to a change in mode. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-154439 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the converter described in Patent Document 1, the input voltage is uniquely determined by the output voltage of the switched capacitor DC / DC converter, and no consideration is given to the input current. Therefore, if there is a current regulation for the external power supply connected to the input of the switched capacitor DC / DC converter, it is desirable to limit the function so that the regulation is not exceeded. When using such an external power supply as a power source, it is necessary to efficiently utilize the capacity of the external power supply while minimizing the impairment of the operating performance of the electronic device.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to efficiently utilize the capacity of an external power source while minimizing the impairment of the operating performance of electronic devices. [Means for solving the problem]

[0006] In order to achieve the above object, an electronic device according to the present invention comprises: connection means for connecting an external device; first conversion means for converting a voltage and a current supplied from the external device using a capacitor, the first conversion means converting the voltage supplied from the external device into a fraction of an integer and the current supplied from the external device into a reciprocal multiple of the fraction of an integer; a bypass switch connected to the connection means in parallel to the first conversion means and outputting power supplied from the external device bypassing the first conversion means; control means for controlling the bypass switch and the first conversion means; acquisition means for communicating with the external device and acquiring information regarding the power supply capacity of the external device; and calculation means for calculating the voltage and current required for operation in an operation mode set for the electronic device based on information regarding power consumption for a plurality of operation modes settable for the electronic device, wherein the control means controls the bypass switch and the first conversion means so as to obtain the calculated voltage and current based on the information regarding the power supply capacity acquired by the acquisition means. If the external device can supply the calculated voltage and current, the control means requests the external device to supply the voltage and current required for the operation and controls the bypass switch to be turned on. do. [Effects of the Invention]

[0007] According to the present invention, it is possible to efficiently utilize the capacity of an external power source while minimizing the loss of operational performance of an electronic device. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a block diagram illustrating the configuration of an electronic device 101 according to a first embodiment. [Figure 2] 3 is a diagram for explaining an example of power consumption information of the electronic device 101 according to the first embodiment. FIG. [Figure 3] 10 is a flowchart illustrating an example of the operation of the electronic device 101 according to the first embodiment. [Figure 4] 10 is a diagram for explaining an example of information about power that can be supplied by an external device 151 according to the first embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments.

[0010] [Embodiment 1] FIG. 1 is a block diagram illustrating the configuration of an electronic device 101 according to the first embodiment.

[0011] The interface 102 is an interface such as a USB, and by connecting to an interface 152 of an external device 151, it receives power from a power supply circuit 153 and transmits and receives device information and image data between them.

[0012] The power supply capability determination circuit 103 communicates with the external device 151 connected to the interface 102, and acquires information about the power that can be supplied by the external device 151. The power supply capability determination circuit 103 also requests the external device 151 for the required power.

[0013] The power supply device 104 includes a bypass switch 105, a first DC-DC converter 106, a second DC-DC converter 107, a power supply control circuit 108, and a power information memory 109. The bypass switch 105 outputs power supplied via the interface 102, bypassing the first DC-DC converter 106 and the second DC-DC converter 107 connected in parallel. The first DC-DC converter 106 charges and discharges the connected switched capacitor 110, thereby converting the voltage supplied via the interface 102 into a voltage that is an integer fraction and outputting the voltage.

[0014] Switched capacitor 110 is made up of a plurality of capacitors, and in the first embodiment, it is made up of three capacitors: capacitor 111, capacitor 112, and capacitor 113. Note that the number of capacitors making up switched capacitor 110 is not limited to this, and may be two, four, or more.

[0015] The first DC-DC converter 106 can convert the voltage supplied to the first DC-DC converter 106 to one-half the voltage and output the converted voltage by controlling the charging and discharging of two capacitors (capacitor 111 and capacitor 112). Furthermore, the first DC-DC converter 106 can convert the voltage supplied to the first DC-DC converter 106 to one-third the voltage and output the converted voltage by controlling the charging and discharging of three capacitors (capacitor 111, capacitor 112, and capacitor 113).

[0016] The second DC-DC converter 107 converts the power supply voltage supplied via the interface 102 into an arbitrary voltage (constant voltage) and outputs it. The output voltage can be changed under the instruction of the power supply control circuit 108.

[0017] The outputs of the bypass switch 105 , the first DC-DC converter 106 , and the second DC-DC converter 107 are connected to a charging current control circuit 115 , a third DC-DC converter 116 , a lens barrel circuit 117 , and a strobe circuit 118 .

[0018] The power supply control circuit 108 controls the power supply device 104 based on the power supply capacity of the external device 151 determined by the power supply capacity determination circuit 103 and the power consumption information recorded in the power information memory 109. The control processing performed by the power supply control circuit 108 will be described later.

[0019] The power information memory 109 stores power consumption information based on the supply voltage and the operation mode of the electronic device 101. Fig. 2 shows an example of the power consumption information of the electronic device 101 stored in the power information memory 109. The power information memory 109 records the maximum value of the current consumption of the electronic device 101 for each voltage range of the battery 114, which has been divided in advance, and for each operation mode.

[0020] The battery 114 is a lithium ion battery or the like that is built into the electronic device 101 and supplies power to the electronic device 101 when there is no external power supply. The charging current control circuit 115 controls the charging current to the battery 114.

[0021] The third DC-DC converter 116 generates voltages required by the functional devices constituting the electronic device 101 from the voltage output from the battery 114 or the bypass switch 105, the first DC-DC converter 106, or the second DC-DC converter 107. In the first embodiment, the audio processing circuit 119, the display circuit 120, the imaging circuit 121, and the CPU 122 each generate the required voltages.

[0022] Power is supplied to the lens barrel circuit 117 and the strobe circuit 118 from a battery 114 or a voltage output from either the bypass switch 105, the first DC-DC converter 106, or the second DC-DC converter 107. The lens barrel circuit 117 controls the shutter, aperture, and zoom by controlling the lens barrel device of the electronic device 101. The strobe circuit 118 supplements the amount of light when photographing a subject in a dark scene or when photographing a bright scene such as backlit.

[0023] The audio processing circuit 119 performs processing for recording the moving image captured by the imaging circuit 121, and processing for outputting operation sounds of the electronic device 101 and playback sounds of the captured moving image.

[0024] The display circuit 120 is used to display still images and moving images captured by the imaging circuit 121, the setting menu of the electronic device 101, and the like.

[0025] The imaging circuit 121 converts light incident from the lens barrel device of the electronic device 101 into an electrical signal.

[0026] A CPU (Central Processing Unit) 122 controls the entire electronic device 101 .

[0027] The external device 151 has an interface 152 having a power supply function and a data transmission function, a power supply circuit 153 that generates a voltage to be output to the outside, and a power supply capability memory 154 that stores information about the power that can be supplied by the power supply circuit 153. Furthermore, the external device 151 has a power supply control circuit 155 that controls the power supply circuit 153, and an MPU 156 that controls the external device 151 as a whole.

[0028] Next, an example of the operation of the electronic device 101 in the first embodiment will be described with reference to the flowchart of FIG.

[0029] When the external device 151, which is an external power supply, is not connected to the interface 102, the bypass switch 105 is in the ON state, and the first DC-DC converter 106 and the second DC-DC converter 107 are in the non-operation state. In S300, it is determined whether or not the external device 151 (external power supply) has been detected, and monitoring continues in S300 until the external device 151 (external power supply) is detected.

[0030] When the external device 151 (external power supply) is detected in S300, the CPU 122 detects the voltage output (5.0V) of the power supply circuit 153 via the interface 102 and the interface 152 of the external device 151, and activates the power supply capability determination circuit 103 in S301.

[0031] 4(a), 4(b), and 4(c) show examples of power information stored in the power capability memory 154 that can be supplied by the external device 151. The power information stores information about the voltage and current values ​​that the external device 151 can output. The power that can be supplied varies depending on the specifications of the external device 151. FIG. 4(a) shows power information that can be supplied when the external device 151 complies with the USB Power Delivery (PD) standard, the USB Type-C standard, and the programmable power supply (PPS) function. FIG. 4(b) shows power information that can be supplied when the external device 151 complies with the USB PD standard and the USB Type-C standard but does not comply with the PPS function. FIG. 4(c) shows power information that can be supplied when the external device 151 does not comply with the USB PD standard or the PPS function but complies with the USB Type-C standard.

[0032] In S302, the power supply capability determination circuit 103 communicates with the MPU 156 of the external device 151 via the interface 102, and acquires from the power supply capability memory 154 information on the power that the external device 151 can supply.

[0033] In S303, the power supply capability determination circuit 103 supplies the power information acquired in S302 to the CPU 122, and the CPU 122 determines whether the connected external device 151 complies with the PPS function. If it is determined that the external device 151 complies with the PPS function (YES in S303), the CPU 122 proceeds to S304. If it is determined that the external device 151 does not complies with the PPS function (NO in S303), the CPU 122 proceeds to S321.

[0034] In S304, the CPU 122 checks the voltage Vbatt of the battery 114.

[0035] In S305, the CPU 122 calculates the current consumption of the electronic device 101 from the voltage Vbatt of the battery 114 and the power information of the electronic device 101 recorded in the power information memory 109 shown in Fig. 2. Here, the calculation is performed by adding up the corresponding numerical values ​​from the current consumption table shown in Fig. 2. For example, if the voltage Vbatt of the battery 114 is 7.4 V and the electronic device 101 is recording 4K60p video and charging, the current consumption will be 1.64 A (= 0.64 A + 1.0 A).

[0036] In S306, the CPU 122 determines, based on the current calculated in S305, whether a current sufficient to operate the electronic device 101 can be supplied from the external device 151 via the bypass switch 105. For example, as described above, if the voltage Vbatt of the battery 114 is 7.4 V and the current consumption of the electronic device 101 is 1.64 A, the CPU 122 determines, based on the power information shown in FIG. 4(a), whether the electronic device 101 can operate via the bypass switch 105 when requesting 7.42 V from the external device 151 to charge the battery 114. The power information shown in FIG. 4(a) indicates power information that can be supplied when the external device 151 complies with all of the USB PD standard, the USB Type-C standard, and the PPS function. From the power information shown in FIG. 4(a), it can be seen that the current that can be supplied from the external device 151 at 7.42 V is 3.0 A. This is sufficiently greater than the current consumption of 1.64 A required by the electronic device 101, and so in this case it is determined that the current can be supplied via the bypass switch 105. If it is determined in S306 that the required current consumption can be supplied via the bypass switch 105 (YES in S306), the CPU 122 proceeds to S307. If it is determined in S306 that the required current consumption cannot be supplied via the bypass switch 105 (NO in S306), the CPU 122 proceeds to S309.

[0037] In S307, the CPU 122 instructs the power supply control circuit 108 to maintain the ON state of the bypass switch 105. The power supply control circuit 108 maintains the ON state of the bypass switch 105 and the OFF state (non-operating state) of the first DC-DC converter 106 and the second DC-DC converter 107.

[0038] In S308, the CPU 122 requests the required voltage from the external device 151 via the power supply capability determination circuit 103, and the flowchart in Fig. 3 ends. In the external device 151, the MPU 156 receives the request for the required voltage, transmits the requested voltage to the power supply control circuit 155, and the power supply control circuit 155 controls the power supply circuit 153 to generate the requested voltage.

[0039] In S305, for example, when the voltage Vbatt of the battery 114 is 6.5 V and the electronic device 101 performs continuous shooting at a frame rate of 15 and charges, the current consumption calculated based on Fig. 2 is 5.5 A (= 4.5 A + 1.0 A). Since the current that can be supplied via the bypass switch 105 of the external device 151 is up to 3 A in the example shown in Fig. 4(a), it is determined in S306 that the current consumption required for the operation of the electronic device 101 cannot be supplied via the bypass switch 105.

[0040] In S309 to S314, the CPU 122 determines whether the electronic device 101 is operable by supplying current from the external device 151 via the first DC-DC converter 106. The determination method will be described below.

[0041] The first DC-DC converter 106 of the first embodiment is capable of converting a voltage supplied from the external device 151 to one-half or one-third of the original voltage and outputting the voltage. Here, the input voltage (output voltage of the external device 151) of the first DC-DC converter 106 is defined as Vin, and the input current (output current of the external device 151) is defined as Iin. Furthermore, the output voltage (voltage supplied to the electronic device 101) of the first DC-DC converter 106 is defined as Vout, and the output current (current consumed by the electronic device 101) is defined as Iout. The power conversion equations are expressed by, for example, equations (1) and (2). Here, the power conversion efficiency when the input voltage of the first DC-DC converter 106 is converted to one-half the original voltage is defined as η2, and the power conversion efficiency when the input voltage of the first DC-DC converter 106 is converted to one-third the original voltage is defined as η3.

[0042] When converting the input voltage to half the voltage: Vin × Iin / 2 × η2 = Vout / 2 × Iout …(1) When converting the input voltage to one-third the voltage: Vin × Iin / 3 × η3 = Vout / 3 × Iout …(2)

[0043] Therefore, from the above equations (2) and (3), the current required by the external device 151 is half or one-third of the current consumed by the electronic device 101.

[0044] When the input voltage of first DC-DC converter 106 is converted to half the voltage, charging and discharging of capacitors 111 and 112 are controlled. When the input voltage of first DC-DC converter 106 is converted to one-third the voltage, charging and discharging of capacitors 111, 112, and 113 are controlled. Therefore, the power conversion efficiency of first DC-DC converter 106 has the relationship η2>η3.

[0045] In S309, the CPU 122 determines, based on the power information shown in FIG. 4A, whether a voltage twice the voltage Vbatt of the battery 114 detected in S304 or a voltage greater than this is within a range that can be set by the external device 151. For example, if the voltage Vbatt of the battery 114 is 6.5 V and the electronic device 101 performs continuous shooting at a frame rate of 15 and charging, it determines whether a voltage obtained by offsetting the charging voltage from 13 V (6.5 V × 2) is within a range that can be set by the external device 151. In this case, it is determined that this is possible based on the power information shown in FIG. 4A. If a voltage twice the voltage Vbatt of the battery 114 detected in S304 or a voltage greater than this is within a range that can be set by the external device 151 (YES in S309), the CPU 122 proceeds to S310. If the voltage twice the voltage Vbatt of the battery 114 detected in S304 or a voltage greater than this is not within the range that can be set by the external device 151 (NO in S309), the CPU 122 proceeds to S315.

[0046] In S310, the CPU 122 determines whether half the current calculated in S305 (the reciprocal of the voltage magnification required for the external device 151) is within a range that the external device 151 can supply. For example, if the voltage Vbatt of the battery 114 is 6.5 V and the electronic device 101 performs continuous shooting at a frame rate of 15 and charging, the CPU 122 determines whether the external device 151 can supply approximately 2.75 A, which is half the current consumption of the electronic device 101, 5.5 A (= 4.5 A + 1.0 A). In this case, it is determined that the current can be supplied based on the power information shown in FIG. 4(a). If half the current calculated in S305 is within a range that the external device 151 can supply (YES in S310), the CPU 122 proceeds to S311. If the current calculated in S305 by half is not within the range that the external device 151 can supply (NO in S310), the CPU 122 proceeds to S313.

[0047] When the process proceeds from S310 to S311, in S311 the CPU 122 instructs the power supply control circuit 108 to operate the first DC-DC converter 106. The first DC-DC converter 106 controls the charging and discharging of two capacitors (capacitor 111 and capacitor 112), converts the input voltage of the first DC-DC converter 106 to half the voltage, and outputs the voltage.

[0048] In S312, the power supply control circuit 108 turns off the bypass switch 105 and switches the external power supply path of the electronic device 101 from the bypass switch 105 to the first DC-DC converter 106. Then, in S308, the CPU 122 requests the required voltage from the external device 151 via the power supply capability determination circuit 103. For example, if the voltage Vbatt of the battery 114 is 6.5V and the electronic device 101 performs continuous shooting at a frame rate of 15 and charging, the supply voltage requested is 13.02V, which is 13V (6.5V x 2) offset by the charging amount. In the external device 151, the MPU 156 receives the required voltage request and transmits it to the power supply control circuit 155, which controls the power supply circuit 153 to generate the requested voltage. In the above example, the power supply circuit 153 is controlled to generate 13.02V.

[0049] In S313, the CPU 122 determines, based on the power information shown in FIG. 4A, whether a voltage three times the voltage Vbatt of the battery 114 detected in S304 or a voltage greater than this is within a range that can be set by the external device 151. For example, if the voltage Vbatt of the battery 114 is 5.5 V and the electronic device 101 performs continuous shooting at a frame rate of 15 and charging, the CPU 122 determines whether a voltage obtained by offsetting the charging voltage from 16.5 V (5.5 V × 3) is within a range that can be set by the external device 151. In the example shown in FIG. 4A, it is determined that this is settable. If a voltage three times the voltage Vbatt of the battery 114 detected in S304 or a voltage greater than this is within a range that can be set by the external device 151 (YES in S313), the CPU 122 proceeds to S314. If the voltage three times the voltage Vbatt of the battery 114 detected in S304 or a voltage greater than this is not within the range that can be set by the external device 151 (NO in S313), the CPU 122 proceeds to S315.

[0050] In S314, the CPU 122 determines whether one-third of the current calculated in S305 is within the range that can be supplied by the external device 151. For example, if the voltage Vbatt of the battery 114 is 5.5 V and the electronic device 101 performs continuous shooting at a frame rate of 15 and charges, the current consumption of the electronic device 101 is 6.2 A (= 5.2 A + 1.0 A) as shown in FIG. 2. In the determination in S310, 3.1 A is requested as the supply current of the external device 151. However, in the example shown in FIG. 4(a), the current that the external device 151 can supply is 3 A, and therefore cannot supply this. In contrast, in S314, the CPU 122 determines whether the external device 151 can supply approximately 2.07 A, which is one-third of the current consumption of the electronic device 101, 6.2 A (the reciprocal of the magnification of the voltage required by the external device 151), and in the example shown in FIG. 4(a), it is determined that this is possible. If the current one-third the current calculated in S305 is within the range that can be supplied by the external device 151 (YES in S314), the CPU 122 proceeds to S311. If the current one-third the current calculated in S305 is not within the range that can be supplied by the external device 151 (NO in S314), the CPU 122 proceeds to S315.

[0051] When the process proceeds from S314 to S311, in S311 the CPU 122 instructs the power supply control circuit 108 to operate the first DC-DC converter 106. The first DC-DC converter 106 controls the charging and discharging of three capacitors (capacitor 111, capacitor 112, and capacitor 113), converts the input voltage of the first DC-DC converter 106 to one-third of the voltage, and outputs the voltage. Thereafter, in S312 and S308, the above-mentioned processes are performed.

[0052] If it is determined in any of S309, S313, and S314 that voltage setting or current supply is not possible, it means that the supply capacity of the external device 151 is not sufficient to supply the power corresponding to the load of the electronic device 101. In this case, in S315, the CPU 122 imposes functional restrictions on the operation of the electronic device 101 to the extent that the external device 151 can supply power. For example, a method can be considered in which frame measurement is reduced or charging is stopped during continuous shooting based on the power consumption shown in FIG.

[0053] Next, a case where it is determined that the external device 151 does not comply with the PPS function (NO in S303) will be described. For an external device 151 that does not comply with the PPS function, the power information acquired in S302 corresponds to either Fig. 4(b) or Fig. 4(c), and the number of selectable voltages that can be set is limited.

[0054] In S321, the CPU 122 checks the voltage Vbatt of the battery 114, similarly to S304.

[0055] In S322, the CPU 122 determines the charging voltage of the battery 114 based on the voltage Vbatt checked in S321.

[0056] In S323, similarly to S305, the CPU 122 calculates the current consumption of the electronic device 101 from the voltage Vbatt of the battery 114 and the power information of the electronic device 101 recorded in the power information memory 109 shown in Fig. 2. The calculation is performed by adding up the corresponding values ​​in the table of current consumption shown in Fig. 2.

[0057] In S324, the CPU 122 determines whether the current calculated in S323 can be supplied under the conditions of the maximum power value that can be set by the external device 151 shown in FIGS. 4(b) and 4(c). For example, if the external device 151 complies with the USB PD standard and the USB Type-C standard but does not comply with the PPS function, the external device 151 can supply a voltage of up to 20 V and a current of 3 A (FIG. 4(b)). For example, if the external device 151 does not comply with either the USB PD standard or the PPS function but complies with the USB Type-C standard, the external device 151 can supply a voltage of 5 V and a current of 3 A (FIG. 4(c)). If it is determined that the current calculated in S323 can be supplied (YES in S324), the CPU 122 proceeds to step S325. If it is determined that the current calculated in S323 cannot be supplied (NO in S324), the CPU 122 proceeds to step S328. If it is determined in S323 that the calculated current cannot be supplied, this means that the supply capacity of the external device 151 is not sufficient to supply the power corresponding to the load of the electronic device 101, as in S315.

[0058] In S325, the CPU 122 instructs the power supply control circuit 108 to set the output voltage of the second DC-DC converter 107 to the voltage determined in S322. The power supply control circuit 108 controls the second DC-DC converter 107 so that the output voltage of the second DC-DC converter 107 becomes the voltage determined in S322.

[0059] In S326, similarly to S308, the CPU 122 requests the required voltage from the external device 151 via the power supply capability determination circuit 103. In the external device 151, the MPU 156 receives the required voltage request and transmits it to the power supply control circuit 155, which then controls the power supply circuit 153 to generate the required voltage. For example, in the case of FIG. 4(b) where the external device 151 is PD compatible, the voltage is set to 20V, whereas in the case of FIG. 4(C) where the external device is not PD compatible and can only output 5V, the voltage is set to 5V (maintaining the current state).

[0060] In S327, the power supply control circuit 108 turns the bypass switch 105 to the OFF state, and switches the supply path of external power to the electronic device 101 from the bypass switch 105 to the second DC-DC converter 107, as in S312.

[0061] In S328, the CPU 122 imposes functional restrictions on the operation of the electronic device 101 to the extent that power can be supplied from the external device 151. For example, based on the power consumption shown in FIG. 2, a method of reducing frame measurement or stopping charging during continuous shooting can be considered.

[0062] In the first embodiment, the settable voltage and supplyable current of the external device 151 are set to the values ​​shown in FIG. 4, but the settable voltage and supplyable current of the external device 151 are not limited to the values ​​shown in FIG. 4.

[0063] As described above, according to the first embodiment, by selectively using the switched capacitor 110, it is possible to efficiently utilize the capabilities of the external device 151 (external power supply) while minimizing the impairment of the operating performance of the electronic device 101.

[0064] [Embodiment 2] At least one of the various functions, processes, and methods described in the above embodiments can also be realized by a personal computer, a microcomputer, a CPU (Central Processing Unit), or a microprocessor executing a program. In the following, in embodiment 2, the personal computer, microcomputer, CPU, or microprocessor will be referred to as "computer X." In embodiment 2, a program for controlling computer X and for realizing at least one of the various functions, processes, and methods described in the above embodiments will be referred to as "program Y."

[0065] At least one of the various functions, processes, and methods described in the above embodiments is realized by computer X executing program Y. In this case, program Y is supplied to computer X via a computer-readable storage medium. The computer-readable storage medium in embodiment 2 includes at least one of a hard disk drive, a magnetic storage device, an optical storage device, a magneto-optical storage device, a memory card, a volatile memory, and a non-volatile memory. The computer-readable storage medium in embodiment 2 is a non-transitory storage medium. [Explanation of symbols]

[0066] 101...electronic device, 102...interface, 103...power supply capability determination circuit, 104...power supply device, 105...bypass switch, 106...first DC-DC converter, 107...second DC-DC converter, 108...power supply control circuit, 109...power information memory, 110...switched capacitor, 111, 112, 113...capacitor, 114...battery, 115...charging current control circuit, 116...third DC-DC converter, 117...lens barrel circuit, 118...strobe circuit, 119...audio processing circuit, 120...display circuit, 121...imaging circuit, 122...CPU, 151...external device, 152...interface, 153...power supply circuit, 154...power supply capability memory, 155...power supply control circuit

Claims

1. An electronic device, a connection means for connecting an external device; a first conversion means for converting the voltage and current supplied from the external device using a capacitor, the first conversion means converting the voltage supplied from the external device into a fraction of an integer and converting the current supplied from the external device into a reciprocal multiple of the fraction of an integer; a bypass switch connected to the connection means in parallel with the first conversion means, for outputting the power supplied from the external device while bypassing the first conversion means; a control means for controlling the bypass switch and the first conversion means; an acquisition means for communicating with the external device to acquire information about the power supply capacity of the external device; a calculation means for calculating a voltage and a current required for operation in a plurality of operation modes that can be set in the electronic device based on information on power consumption for the plurality of operation modes that can be set in the electronic device; and the control means controls the bypass switch and the first conversion means based on the information about the power supply capacity acquired by the acquisition means so as to obtain the calculated voltage and current; When the external device is capable of supplying the calculated voltage and current, the control means requests the external device to provide the voltage and current required for the operation, and controls the bypass switch to be turned on.

2. 2. The electronic device according to claim 1, wherein, when the external device cannot supply the calculated voltage and current but can obtain the calculated voltage and current by converting a voltage and current that the external device can supply using the first conversion means, the electronic device requests a voltage from the external device based on the calculated voltage and the integer, performs the conversion using the first conversion means, and controls to turn off the bypass switch.

3. 3. The electronic device according to claim 2, wherein the first conversion means can set a magnification for converting the input voltage to one of a plurality of different integer divisions, and the control means sets the magnification in the first conversion means so that the voltage and current obtained after the voltage and current supplied from the external device are converted by the first conversion means are closest to the calculated voltage and current.

4. 4. The electronic device according to claim 2, wherein, when the external device cannot supply the calculated voltage and current and the calculated voltage and current cannot be obtained even by converting the voltage and current that the external device can supply using the first conversion means, the operating mode is limited so that the external device can operate within the range of voltage and current that the external device can supply.

5. 5. The electronic device according to claim 1, wherein the control means determines whether the calculated voltage and current are included in the information about the power supply capability when the external device complies with a programmable power supply of USB Power Delivery.

6. a second conversion means connected to the connection means in parallel with the first conversion means and the bypass switch, for converting an input voltage into an arbitrary voltage; 2. The electronic device according to claim 1, wherein, when the number of selected voltages that can be supplied by the external device does not exceed a predetermined number and the external device can supply a voltage and current that are required for the operation and that exceed the calculated voltage and current, the control means requests the external device to supply the voltage required for the operation, converts the voltage supplied from the electronic device using the second conversion means, and controls the bypass switch to be turned off.

7. 7. The electronic device according to claim 6, wherein, when the number of selectable voltages that the external device can supply does not exceed a predetermined number and the external device cannot supply the voltage and current required for the operation, the control means limits the operating mode so that the external device can operate within the range of voltage and current that it can supply.

8. 8. The electronic device according to claim 1, wherein the first conversion means comprises a switched capacitor.

9. a connection means for connecting an external device; a first conversion means for converting the voltage and current supplied from the external device using a capacitor, the first conversion means converting the voltage supplied from the external device into a fraction of an integer and converting the current supplied from the external device into a reciprocal multiple of the fraction of an integer; a bypass switch connected to the connection means in parallel with the first conversion means and configured to output power supplied from the external device while bypassing the first conversion means, an acquisition step of communicating with the external device to acquire information about the power supply capacity of the external device; a calculation step of calculating a voltage and a current required for operation in a plurality of operation modes set in the electronic device based on information on power consumption for the plurality of operation modes set in the electronic device; a control step of controlling the bypass switch and the first conversion means based on the information about the power supply capacity acquired in the acquisition step so as to obtain the calculated voltage and current; When the external device is capable of supplying the calculated voltage and current, the control step requests the external device to provide the voltage and current required for the operation, and controls the bypass switch to be turned on.

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