JP2023048004A - Electronic apparatus and control method - Google Patents

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

The present invention relates to an electronic device having a switched capacitor and a control method thereof.

Patent Document 1 describes a converter having a switched capacitor, in which an output voltage determined for each mode of an electronic device is set, and the output voltage is changed according to the mode change.

JP 2016-154439 A

However, in the converter described in Patent Document 1, the input voltage is uniquely determined by the output voltage of the switched capacitor DCDC, and no consideration is given to the input current. Therefore, if the external power supply connected to the input of the switched capacitor DCDC has a current regulation, it is desirable to limit the function so as not to exceed the regulation. When such an external power source is used as a power source, it is required to efficiently use the capability of the external power source and to prevent the operational performance of the electronic device from deteriorating as much as possible.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to efficiently utilize the capacity of an external power supply and to prevent the operating performance of an electronic device from being impaired as much as possible.

To achieve the above object, an electronic device according to the present invention uses a capacitor to convert a voltage supplied from an external device into an integer fraction, and converts a current supplied from the external device to an integer fraction of the voltage. and a bypass switch connected in parallel with the first conversion means for converting the power supplied from the external device to bypass the first conversion means and output the power supplied from the external device. a control means for controlling the bypass switch and the first conversion means; a determination means for communicating with the external device to determine the power supply capability of the external device; calculating means for calculating the voltage and current required for operation in the operating mode set in the electronic device based on the power consumption information for the operating mode, wherein the control means calculates the power supply capacity based on the power supply capacity to control the bypass switch and the first conversion means so as to obtain the voltage and current required for the operation.

According to the present invention, it is possible to efficiently use the capacity of the external power supply and to prevent the operational performance of the electronic device from being impaired as much as possible.

2 is a block diagram for explaining the configuration of the electronic device 101 according to Embodiment 1. FIG. 4 is a diagram for explaining an example of power consumption information of the electronic device 101 according to the first embodiment; FIG. 4 is a flowchart for explaining an operation example of the electronic device 101 in Embodiment 1. FIG. 4 is a diagram for explaining an example of power information that can be supplied by the external device 151 according to the first embodiment; FIG.

Embodiments of the present invention will be described below with reference to the drawings. However, the present invention is not limited to the following embodiments.

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

The interface 102 is an interface such as a USB, and is connected to the interface 152 of the external device 151 to receive power supply from the power supply circuit 153 and transmit/receive device information and image data between the two.

The power capability determination circuit 103 communicates with the external device 151 connected to the interface 102 and acquires power information that the external device 151 can supply. It also requests the external device 151 for the necessary power.

The power supply device 104 has a configuration including a bypass switch 105 , a first DC-DC converter 106 , a second DC-DC converter 107 , a power control circuit 108 and a power information memory 109 . The bypass switch 105 bypasses the first DC-DC converter 106 and the second DC-DC converter 107 connected in parallel and outputs the power supplied via the interface 102 . The first DC-DC converter 106 charges and discharges the connected switched capacitor 110 to convert the voltage supplied via the interface 102 into a voltage divided by an integer and outputs the voltage.

The switched capacitor 110 is composed of a plurality of capacitors, and in the first embodiment, is composed of three capacitors, capacitors 111 , 112 and 113 . The number of capacitors forming switched capacitor 110 is not limited to this, and may be two or four or more.

First DC-DC converter 106 controls the charging and discharging of two capacitors (capacitor 111 and capacitor 112) to halve the voltage supplied to first DC-DC converter 106. can be converted into voltage and output. Further, first DC-DC converter 106 controls charging and discharging of three capacitors (capacitor 111, capacitor 112, and capacitor 113) to reduce the voltage supplied to first DC-DC converter 106 to three It is also possible to convert the voltage to 1/1 and output it.

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 direction of power supply control circuit 108 .

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

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

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 power consumption information of the electronic device 101 stored in the power information memory 109. As shown in FIG. In the power information memory 109, the maximum value of current consumption of the electronic device 101 is recorded in advance for each voltage range of the battery 114 and each operation mode.

A battery 114, such as a lithium ion battery, is built in the electronic device 101 and supplies power to the electronic device 101 when power is not supplied from the outside. A charging current control circuit 115 controls charging current to the battery 114 .

The third DC-DC converter 116 configures the electronic device 101 from the voltage output from either the battery 114, the bypass switch 105, the first DC-DC converter 106, or the second DC-DC converter 107. A functional device that generates the required voltages. In Embodiment 1, the audio processing circuit 119, the display circuit 120, the image pickup circuit 121, and the CPU 122 generate necessary voltages.

Power is supplied to the lens barrel circuit 117 and strobe circuit 118 by supplying voltage output from either the battery 114, the bypass switch 105, the first DC-DC converter 106, or the second DC-DC converter 107. It is configured. A 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 assists the amount of light when the subject is photographed in a dark scene or in a bright scene such as a backlight.

The audio processing circuit 119 performs recording processing of moving images captured by the imaging circuit 121 and processing of outputting operation sounds of the electronic device 101, playback sounds of captured moving images, and the like.

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

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

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

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 capacity memory 154 that stores power information that the power supply circuit 153 can supply. . Furthermore, the external device 151 has a power control circuit 155 that controls the power circuit 153 and an MPU 156 that controls the external device 151 as a whole.

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

When the interface 102 is not connected to the external device 151, which is an external power supply, 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 a non-operating state. be. In S300, it is determined whether or not the external device 151 (external power source) is detected, and monitoring continues in S300 until the external device 151 (external power source) is detected.

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

4(a), 4(b) and 4(c) show an example of power information that is stored in the power capacity memory 154 and that can be supplied by the external device 151. FIG. As power information, information on voltage values and current values that can be output by the external device 151 is stored. Note that the power that can be supplied varies depending on the specifications of the external device 151 . FIG. 4A shows power information that can be supplied when the external device 151 conforms to the USB Power Delivery (PD) standard, USB Type-C standard, and programmable power supply (PPS) function. showing. FIG. 4B shows power information that can be supplied when the external device 151 complies with the USB PD standard and 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 conforms to the USB Type-C standard while conforming to neither the USB PD standard nor the PPS function.

In S<b>302 , the power capability determination circuit 103 communicates with the MPU 156 of the external device 151 via the interface 102 and acquires power information that the external device 151 can supply from the power capability memory 154 .

In S303, the power 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 conforms to the PPS function. If it is determined that the external device 151 conforms to the PPS function (YES in S303), the CPU 122 proceeds to S304. If it is determined that the external device 151 does not comply with the PPS function (NO in S303), the CPU 122 proceeds to S321.

At S304, the CPU 122 checks the battery 114 voltage Vbatt.

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. Here, the calculation is performed by totaling the corresponding numerical values from the consumption current table shown in FIG. For example, when the voltage Vbatt of the battery 114 is 7.4 V and the electronic device 101 performs 4K60p video recording and charging, the current consumption is 1.64 A (=0.64 A+1.0 A).

In S<b>306 , the CPU 122 determines whether or not the external device 151 can supply a current that allows the electronic device 101 to operate through the bypass switch 105 based on the current calculated in S<b>305 . For example, as described above, when 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 supplies 7.42 V to the external device 151 to charge the battery 114. Whether or not the electronic device 101 can operate via the bypass switch 105 when requested is determined based on the power information shown in FIG. The power information shown in FIG. 4A indicates power information that can be supplied when the external device 151 complies with all of the USB PD standard, USB Type-C standard, and PPS function. From the power information shown in FIG. 4A, it can be seen that the suppliable current of the external device 151 at 7.42V is 3.0A. Since this sufficiently exceeds the current consumption of 1.64 A required by the electronic device 101, it is determined that the power can be supplied via the bypass switch 105 in this case. If it is determined in S306 that the necessary consumption current can be supplied via the bypass switch 105 (YES in S306), the CPU 122 proceeds to S307. When it is determined in S306 that the required consumption current cannot be supplied via the bypass switch 105 (NO in S306), the CPU 122 proceeds to S309.

In S307, the CPU 122 instructs the power control circuit 108 to keep the bypass switch 105 ON. The power control circuit 108 keeps the bypass switch 105 in the ON state and the first DC-DC converter 106 and the second DC-DC converter 107 in the OFF state (non-operating state).

In S308, the CPU 122 requests the external device 151 for the required voltage via the power capability determination circuit 103, and the flow chart of FIG. 3 ends. In the external device 151, the MPU 156 receives the required voltage request, transmits the requested voltage to the power control circuit 155, and the power control circuit 155 controls the power circuit 153 to generate the requested voltage.

In S305, for example, when the voltage Vbatt of the battery 114 is 6.5 V and the electronic device 101 performs continuous shooting and charging at a frame speed of 15, the current consumption calculated based on FIG. 2 is 5.5 A (= 4.5A+1.0A). 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. determined to be unable to supply.

In S309 to S314, the CPU 122 determines whether or not the electronic device 101 can operate by supplying current from the external device 151 through the first DC-DC converter 106. FIG. The determination method will be described below.

The first DC-DC converter 106 of Embodiment 1 can convert the voltage supplied from the external device 151 into a voltage of 1/2 or 1/3 and output the converted voltage. Let Vin be the input voltage (output voltage of the external device 151) of the first DC-DC converter 106, and Iin be the input current (output current of the external device 151). Let Vout be the output voltage (supply voltage to the electronic device 101) of the first DC-DC converter 106, and Iout be the output current (consumption current of the electronic device 101). A power conversion formula is represented by Formula (1) and Formula (2), for example. Here, η2 is the power conversion efficiency when the input voltage of the first DC-DC converter 106 is converted to 1/2 voltage, and the input voltage of the first DC-DC converter 106 is reduced to 1/3. Let η3 be the power conversion efficiency when the voltage is converted to the voltage of .

When converting the input voltage to half the voltage:
Vin×Iin/2×η2=Vout/2×Iout (1)
When converting the input voltage to 1/3 voltage:
Vin×Iin/3×η3=Vout/3×Iout (2)

Therefore, according to the above formulas (2) and (3), the current required for the external device 151 is half or one third of the current consumption of the electronic device 101 .

When the input voltage of the first DC-DC converter 106 is voltage-converted into a half voltage, the charging and discharging of the capacitors 111 and 112 are controlled. When the input voltage of the first DC-DC converter 106 is converted to 1/3 voltage, the charging and discharging of the capacitors 111, 112 and 113 are controlled. Therefore, the power conversion efficiency of the first DC-DC converter 106 has a relationship of η2>η3.

In S309, based on the power information shown in FIG. 4(a), the CPU 122 sets a voltage obtained by doubling the voltage Vbatt of the battery 114 detected in S304 or a higher voltage within a range that can be set by the external device 151. Determine whether it is within For example, when the voltage Vbatt of the battery 114 is 6.5V and the electronic device 101 performs continuous shooting and charging at a frame speed of 15, the voltage offset by the charging voltage is 13V (6.5V×2). It is determined whether or not it is within a range that can be set by the external device 151 . In this case, it is determined that the setting is possible from the power information shown in FIG. If the voltage obtained by doubling the voltage Vbatt of the battery 114 detected in S304 or a higher voltage is within the range that can be set by the external device 151 (YES in S309), the CPU 122 proceeds to S310. If the voltage obtained by doubling the voltage Vbatt of the battery 114 detected in S304 or a higher voltage is not within the range that can be set by the external device 151 (NO in S309), the CPU 122 proceeds to S315.

In S310, the CPU 122 determines whether the current obtained by dividing the current calculated in S305 by half (reciprocal multiple of the voltage required by the external device 151) is within the range that the external device 151 can supply. determine whether For example, when the voltage Vbatt of the battery 114 is 6.5 V and the electronic device 101 performs continuous shooting and charging at a frame rate of 15, the current consumption of the electronic device 101 is 5.5 A (=4.5 A + 1.0 A) by 2 It is determined whether or not the external device 151 can supply approximately 2.75 A, which has been divided by one. In this case, it is determined that the power can be supplied from the power information shown in FIG. If the current obtained by dividing the current calculated in S305 by half is within the supply range of the external device 151 (YES in S310), the CPU 122 proceeds to S311. If the half of the current calculated in S305 is not within the supply range of the external device 151 (NO in S310), the CPU 122 proceeds to S313.

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

In S<b>312 , the power 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 S<b>308 , the CPU 122 requests the external device 151 for the required voltage via the power capability determination circuit 103 . For example, when the voltage Vbatt of the battery 114 is 6.5 V and the electronic device 101 performs continuous shooting and charging at a frame speed of 15, 13 V (6.5 V x 2) is supplied with 13.02 V offset by the charging amount. Request as voltage. In the external device 151, the MPU 156 receives the request for the required voltage and transmits it to the power supply control circuit 155, which controls the power supply circuit 153 to generate the required voltage. In the above example, the power supply circuit 153 is controlled so that the voltage becomes 13.02V.

In S313, based on the power information shown in FIG. 4(a), the CPU 122 sets a voltage that is three times the voltage Vbatt of the battery 114 detected in S304 or a higher voltage within a range that can be set by the external device 151. Determine whether it is within For example, when the voltage Vbatt of the battery 114 is 5.5 V and the electronic device 101 performs continuous shooting and charging at a frame speed of 15, the charge voltage is offset from 16.5 V (5.5 V×3). It is determined whether or not the voltage is within a range that can be set by the external device 151 . In the example shown in FIG. 4A, it is determined that the setting is possible. If the voltage obtained by tripling the voltage Vbatt of the battery 114 detected in S304 or a higher voltage is within the range that can be set by the external device 151 (YES in S313), the CPU 122 proceeds to S314. If the voltage obtained by tripling the voltage Vbatt of the battery 114 detected in S304 or a higher voltage is not within the range that can be set by the external device 151 (NO in S313), the CPU 122 proceeds to S315.

In S<b>314 , the CPU 122 determines whether or not the current obtained by dividing the current calculated in S<b>305 by one third is within the supply range of the external device 151 . For example, when the voltage Vbatt of the battery 114 is 5.5 V and the electronic device 101 performs continuous shooting and charging at a frame rate of 15, the current consumption of the electronic device 101 is 6.2 A (=5.2 A + 1.0 A from FIG. 2). ). In the determination of S310, 3.1 A is required as the supply current of the external device 151, but in the example shown in FIG. On the other hand, in the determination of S314, the external device 151 consumes about 2.07 A, which is one third of the 6.2 A consumption current of the electronic device 101 (reciprocal multiple of the voltage required by the external device 151). It is determined whether or not the supply is possible, and in the example shown in FIG. 4A, it is determined that the supply is possible. If the current obtained by dividing the current calculated in S305 by one-third is within the suppliable range of the external device 151 (YES in S314), the CPU 122 proceeds to S311. If the current obtained by dividing the current calculated in S305 by one-third is not within the suppliable range of the external device 151 (NO in S314), the CPU 122 proceeds to S315.

When proceeding from S314 to S311, in S311, the CPU 122 instructs the power supply control circuit 108 to operate the first DC-DC converter 106. FIG. The first DC-DC converter 106 controls charging and discharging of three capacitors (capacitor 111, capacitor 112 and capacitor 113) to reduce the input voltage of the first DC-DC converter 106 to one-third voltage. Convert voltage and output. After that, in S312 and S308, the above-described processing is performed.

If it is determined in any of S309, S313, and S314 that the voltage setting or current supply is impossible, it means that the power supply capacity of the external device 151 cannot supply enough power to the load of the electronic device 101. . In that case, in S<b>315 , the CPU 122 limits the operation of the electronic device 101 to the extent that the external device 151 can supply power. For example, based on the power consumption shown in FIG. 2, it is conceivable to reduce frame measurement or stop charging during continuous shooting.

Next, the case where it is determined that the external device 151 does not conform to the PPS function (NO in S303) will be described. For the external device 151 that does not conform to the PPS function, the power information acquired in S302 corresponds to either of FIG. 4B or FIG. 4C, and the number of selectable voltages that can be set is small.

In S321, the CPU 122 checks the voltage Vbatt of the battery 114 as in S304.

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

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. The calculation method is to sum up the corresponding values from the current consumption table shown in FIG.

In S324, the CPU 122 determines whether the current calculated in S323 can be supplied under the condition of the maximum power value that can be set for the external device 151 shown in FIGS. 4(b) and 4(c). do. For example, if the external device 151 conforms to the USB PD standard and USB Type-C standard but does not conform to the PPS function, the external device 151 can supply a voltage up to 20V and a current of 3A. There is (Fig. 4(b)). For example, if the external device 151 does not conform to the USB PD standard or the PPS function but conforms to the USB Type-C standard, the external device 151 can supply a voltage of 5V and a current of 3A. (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 that the current calculated in S323 cannot be supplied, it means that the power corresponding to the load of the electronic device 101 cannot be supplied with the supply capacity of the external device 151, as in S315.

In S325, the CPU 122 instructs the power 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.

In S<b>326 , the CPU 122 requests the external device 151 for the required voltage via the power capability determination circuit 103 as in S<b>308 . In the external device 151, the MPU 156 receives the request for the required voltage and transmits it to the power supply control circuit 155, which controls the power supply circuit 153 to generate the required voltage. For example, in the case of FIG. 4B in which the external device 151 is compatible with PD, the setting is 20V, and in the case of FIG.

In S327, 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 second DC-DC converter 107, as in S312.

In S<b>328 , 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, it is conceivable to reduce frame measurement or stop charging during continuous shooting.

In the first embodiment, the settable voltage and the suppliable current of the external device 151 are set to the values shown in FIG. 4, but the settable voltage and the suppliable current of the external device 151 are limited to the values shown in FIG. not a thing

As described above, according to the first embodiment, by selectively using the switched capacitor 110, the capability of the external device 151 (external power supply) can be efficiently used and the operating performance of the electronic device 101 can be improved. You can do as little damage as possible.

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

At least one of the various functions, processes and methods described in the above embodiments are implemented by the computer X executing the program Y. In this case, program Y is supplied to computer X via a computer-readable storage medium. A computer-readable storage medium in the second embodiment includes at least one of a hard disk device, a magnetic storage device, an optical storage device, a magneto-optical storage device, a memory card, a volatile memory, a non-volatile memory, and the like. A computer-readable storage medium in the second embodiment is a non-transitory storage medium.

DESCRIPTION OF SYMBOLS 101... Electronic equipment, 102... Interface, 103... Power 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 capacity memory 155 Power supply control circuit

Claims (12)

an electronic device,
a first conversion means for converting a voltage supplied from an external device into a subinteger voltage using a capacitor, and converting a current supplied from the external device into a reciprocal multiple of the subinteger;
a bypass switch connected in parallel with the first conversion means for bypassing the first conversion means and outputting power supplied from the external device;
a control means for controlling the bypass switch and the first conversion means;
determining means for communicating with the external device and determining power supply capability of the external device;
calculating means for calculating the voltage and current required for operation in the operation mode set for the electronic device based on power consumption information for a plurality of operation modes that can be set for the electronic device;
The electronic device, wherein the control means controls the bypass switch and the first conversion means based on the power supply capability so as to obtain the voltage and current required for the operation. The determining means determines that the number of selected voltages that can be supplied by the external device exceeds a predetermined number, and the control means determines that the external device can supply the voltage and current necessary for the operation. 2. When it is determined, the control means requests the voltage and current required for the operation from the external device and selectively operates the bypass switch. The electronic device described in . The determination means determines that the number of selected voltages that can be supplied by the external device exceeds a predetermined number, and the control means determines that the external device cannot supply the voltage and current required for the operation. If it is determined that there is, the control means determines whether or not the external device can supply the voltage and current necessary for the operation by converting with the first conversion means, , the voltage and current before being converted by the first conversion means are requested from the external device, and the first conversion means is controlled to selectively operate. Item 3. The electronic device according to Item 1 or 2. When the first conversion means can convert the supply voltage into a plurality of different voltages divided by integers, the control means controls the voltage and current after conversion by the first conversion means to be equal to the operating voltage. 4. The electronic equipment according to claim 3, wherein said first converting means is controlled so as to be closest to the voltage and current required for . When it is determined that the external device cannot supply the voltage and current necessary for the operation even after conversion by the first conversion means, the control means controls the voltage and current supplied from the external device. 5. The electronic device according to claim 3, wherein the operation mode is restricted and the bypass switch is selectively operated so as to be operable within a range of . 3. The determination means determines that the number of voltages that can be supplied by the external device exceeds a predetermined number when the external device conforms to a programmable power supply. 6. The electronic device according to any one of 2 to 5. 7. The electronic equipment according to claim 1, wherein said first conversion means has a switched capacitor. further comprising second conversion means for converting the supply voltage to generate a constant voltage;
8. The control means further controls the second conversion means based on the power supply capability and the voltage and current required for the operation. The electronic device described in . The determination means determines that the number of selected voltages that can be supplied by the external device does not exceed a predetermined number, and the control means determines whether the external device can supply the voltage and current necessary for the operation. 8. If it is determined that there is, the control means requests the voltage and current required for the operation from the external device and selectively operates the second conversion means. The electronic device described in . The determination means determines that the number of selected voltages that can be supplied by the external device does not exceed a predetermined number, and the control means determines that the external device cannot supply the voltage and current required for the operation. If so, the control means limits the operation mode and selectively operates the bypass switch so that operation is possible within the range of the supply voltage and supply current from the external device. 10. The electronic device according to claim 8 or 9, characterized by controlling. 10. When the external device conforms to Power Delivery, the determining means determines that the number of voltages that can be supplied by the external device does not exceed a predetermined number. 11. The electronic device according to 10. a first conversion means for converting a voltage supplied from an external device into a subinteger using a capacitor, and converting a current supplied from the external device into a reciprocal multiple of the subinteger;
A control method for an electronic device having a bypass switch connected in parallel with the first conversion means for outputting power supplied from the external device by bypassing the first conversion means,
a determination step of communicating with the external device to determine the power supply capability of the external device;
a calculating step of calculating the voltage and current necessary for operating the electronic device in the set operating mode based on power consumption information for a plurality of operating modes that can be set for the electronic device;
A control method, comprising a control step of controlling the bypass switch and the first conversion means so as to obtain the voltage and current required for the operation based on the power supply capability.

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