Electronic device and control method thereof

Abstract

The present invention provides an electronic device and a control method thereof. The electronic device has a cable, and includes a storage component and a communication component. The storage component stores first authentication information for authentication communication for the electronic device and second authentication information for authentication communication for the cable. The communication component can respond to authentication communication for the electronic device and can also respond to authentication communication for the cable.

Description

Technical Field

[0001] Aspects of the present disclosure generally relate to electronic devices and methods of controlling the electronic devices. Background Art

[0002] The USB (Universal Serial Bus) Type-C standard and the USB PD (Power Delivery) standard are well known as standards related to the USB. A USB interface compliant with the USB PD standard can supply power up to 100W.

[0003] Japanese Patent Laid-Open No. 2018-097643 describes a power supply device that performs authentication communication with each of a power receiving device and a USB cable.

[0004] Hereinafter, a power supply device having an integrated USB cable and a power supply device having a connector capable of being connected with a power receiving device without using a USB cable are collectively referred to as a power supply device of a type not requiring an additional cable.

[0005] Japanese Patent Laid-Open No. 2018-097643 does not envision a power supply device of the type not requiring an additional cable. Therefore, even in the case where authentication communication between the power receiving device and the power supply device of the type not requiring an additional cable is successful, authentication communication is performed between the power receiving device and the USB cable. If the power supply device of the type not requiring an additional cable does not support authentication communication for the USB cable, the power supply device of the type not requiring an additional cable cannot perform authentication communication for the USB cable, and power supply from the power supply device of the type not requiring an additional cable to the power receiving device may be unnecessarily restricted. Summary of the invention

[0006] According to various embodiments, there is provided an electronic device having a cable, comprising: a storage component for storing first authentication information for authentication communications for the electronic device and second authentication information for authentication communications for the cable; and a communication component capable of responding to authentication communications for the electronic device and also capable of responding to authentication communications for the cable.

[0007] According to various embodiments, a control method for an electronic device is provided, comprising: responding to authentication communications for the electronic device, the electronic device having a cable and a storage unit, the storage unit storing first authentication information for authentication communications for the electronic device and second authentication information for authentication communications for the cable; and responding to authentication communications for the cable.

[0008] Further aspects of the present disclosure will become apparent from the following description of exemplary embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 : is a diagram for illustrating an example of the configuration of a power supply system according to the first embodiment and the second embodiment.

[0010] Figure 2 1 is a diagram for illustrating components of the power receiving device 300 and components of the power supply device 100 integrated with the cable 120 .

[0011] Figure 3 is a diagram for illustrating an example of an operation sequence in a power supply system.

[0012] Figure 4 1 is a flowchart related to the operation of the PD communication unit 121 of the power supply device 100 . DETAILED DESCRIPTION

[0013] Example embodiments, features, and aspects of the disclosure will be described below with reference to the drawings. However, embodiments of the present invention are not limited to the following example embodiments.

[0014] [First embodiment] Figure 1 : is a diagram for illustrating an example of the configuration of a power supply system according to the first embodiment and the second embodiment.

[0015] like Figure 1 As shown, the power supply system according to the first embodiment and the second embodiment described herein includes a power supply device 100 and a power receiving device 300 capable of operating using power supplied from the power supply device 100. Both the power supply device 100 and the power receiving device 300 are electronic devices that comply with the USB (Universal Serial Bus) PD (Power Delivery) standard and the USB Type-C standard.

[0016] The power supply device 100 is a power supply device having an integrated USB cable (hereinafter referred to as a cable) 120. The power supply device 100 is, for example, an electronic device capable of functioning as a USB-AC adapter, a mobile battery, a personal computer, or a tablet computer.

[0017] Note that the power supply device 100 is not limited to the power supply device integrated with the cable 120. The power supply device 100 may be a power supply device having a connector or a socket that can be connected to the power receiving device 300 without using the cable 120.

[0018] The power receiving device 300 has a USB Type-C socket (hereinafter referred to as a socket) 310 corresponding to a USB Type-C plug (hereinafter referred to as a plug) 130 provided at one end of the cable 120. The power receiving device 300 is an electronic device capable of functioning as, for example, a digital camera, a digital video camera, a personal computer, a tablet computer, a media player, a PDA, a cellular phone, a smart phone, a game console, a robot, or a drone.

[0019] Next, we will refer to Figure 2 describe Figure 1 Components of the power supply system shown.

[0020] The power supply unit 101 is composed of a rectifying and smoothing unit or a DC / DC converter, etc., and rectifies the commercial AC power input from an external unit, and supplies the power required by the various components of the power supply device 100. Note that in the case where DC power is input from an external unit or in the case where the power supply device 100 includes a battery, the power supply unit 101 has a structure corresponding to each case.

[0021] The control unit 102 includes, for example, a hardware processor (e.g., a CPU) for controlling the various components of the power supply device 100 and a memory storing a program that can be executed by the hardware processor. The memory of the control unit 102 stores, for example, a program for realizing an exemplary operation of the power supply device 100 to be described later. In this specification, the operation described as being performed by the power supply device 100 is realized by the control unit 102 that controls the components of the power supply device 100.

[0022] The power supply unit 105 is connected to the VBUS line and supplies power to the power receiving device 300 connected to the power supply device 100. Here, it is assumed that the PD communication unit 121 and the authentication unit 122 to be described later operate with power supplied from the power supply unit 105. However, the PD communication unit 121 and the authentication unit 122 may also operate with power supplied from the power supply unit 101.

[0023] The pull-up resistor 106 is connected to the CC1 line and pulls up the CC1 line to a predetermined voltage. Here, it is assumed that the predetermined power source connected to the pull-up resistor 106 is the power supply unit 101, the voltage of the predetermined power source is 5.0V, and the resistance of the pull-up resistor 106 is 10kΩ. The voltage of the predetermined power source connected to the pull-up resistor 106 and the resistance of the pull-up resistor 106 may each be other values ​​as long as these values ​​are specified by the USB PD standard or the USB Type-C standard.

[0024] The PD communication unit 121 is connected to the CC1 line of the cable 120 and performs communication (PD communication) with the power receiving device 300 connected to the power supply device 100 based on the USB PD standard. The PD communication unit 121 can perform PD communication as a power supply device and PD communication as a cable.

[0025] The authentication unit 122 is connected to the PD communication unit 121 and has a memory for storing authentication information issued from the USB standard promotion organization (USB-IF). Here, the authentication information is information required for authentication communication, including certificate data indicating that the power supply device 100 is recognized by the USB-IF as a predetermined device (device that complies with the USB standard), etc. The memory of the authentication unit 122 stores the first authentication information related to the power supply device 100 and the second authentication information related to the cable 120.

[0026] When authentication information is requested from the power receiving device 300 through PD communication, the authentication unit 122 transmits the authentication information to the power receiving device 300 via the PD communication unit 121 .

[0027] Furthermore, the authentication unit 122 can determine whether the power receiving device 300 is a device authenticated by the USB-IF by decrypting the encrypted authentication information of the power receiving device 300 acquired from the power receiving device 300 through PD communication using the certificate data.

[0028] In the case of using an independent cable, it is not determined which of the CC1 line and the CC2 line is used for PD communication and which is used to supply Vconn until the cable is connected. Therefore, the power supply device needs to have a structure capable of connecting the pull-up resistor 106 to both the CC1 line and the CC2 line, and a structure capable of supplying Vconn to both the CC1 line and the CC2 line.

[0029] However, since the power supply device 100 has the cable 120, the power supply device 100 can fixedly connect the pull-up resistor 106 to the CC1 line. Thus, neither a structure for selectively connecting the pull-up resistor 106 to one of the CC1 line and the CC2 line nor a structure for supplying Vconn to the CC1 line is required. In addition, a pull-up resistor required to detect the connection of the CC2 line is not required.

[0030] The power supply device 100 does not have a structure corresponding to the PD communication unit 121 of the independent cable, and the PD communication unit 121 also serves as the PD communication unit of the cable. Therefore, when using an independent cable, a structure for supplying Vconn to the PD communication unit of the cable is not necessary.

[0031] Furthermore, the cable 120 does not require a PD communication unit and an authentication unit, nor does it require a structure for receiving supply of Vconn from the power supply device 100 .

[0032] On the other hand, the cable 120 needs to notify the power receiving device 300 that communication with the cable 120 is possible. Therefore, the cable 120 has a pull-down resistor 206 for connecting the CC2 line and GND.

[0033] The structure of the power receiving device 300 will be described. The power supply unit 301 includes a power supply such as a lithium ion battery or a DC / DC converter, etc. The power supply unit 301 supplies necessary power to each component of the power receiving device 300 from power supplied from the connected power receiving unit 305 or a power supply.

[0034] The control unit 302 includes, for example, a hardware processor (e.g., a CPU) for controlling the various components of the power receiving device 300 and a memory storing a program that can be executed by the hardware processor. The memory of the control unit 302 stores, for example, a program for implementing an exemplary operation of the power receiving device 300, which will be described later. In this specification, the operation described as being performed by the power receiving device 300 is implemented by the control unit 302 that controls the components of the power receiving device 300.

[0035] The PD communication unit 303 is connected to the CC1 terminal and the CC2 terminal of the socket 310, and performs PD communication with the connected device via the CC1 line or the CC2 line. Here, since the pull-up resistor 106 is connected to the CC1 line and the pull-down resistor 206 is connected to the CC2 line through the power supply device 100, the PD communication unit 303 uses the CC1 line for PD communication.

[0036] The authentication unit 304 is connected to the PD communication unit 303, and includes a memory for storing authentication information required for authentication communication, the authentication information including the certificate data of the power receiving device 300 issued from the USB-IF. The authentication unit 304 can judge whether the power supply device 100 is a predetermined device (a device compliant with the USB PD standard and the USB Type-C standard) by decrypting the authentication information of the power supply device 100 acquired from the power supply device 100 through the PD communication using the certificate data. In addition, the authentication unit 304 can judge whether the cable 120 is a predetermined cable (a cable compliant with the USB PD standard and the USB Type-C standard) by decrypting the authentication information of the cable 120 acquired from the power supply device 100 through the PD communication using the certificate data.

[0037] When authentication information is requested from the power supply apparatus 100 through PD communication, the authentication unit 304 may transmit the authentication information stored in the memory of the authentication unit 304 to the power supply apparatus 100 via the PD communication unit 303 .

[0038] The power receiving unit 305 is connected to the VBUS terminal of the socket 310, and receives power supplied from the power supply device 100 via the VBUS line. The power receiving unit 305 can supply the supplied power to the power supply unit 301 and charge the power supply of the power supply unit 301. Here, it is assumed that the PD communication unit 303 and the authentication unit 304 operate using the power supplied through the VBUS line. However, the PD communication unit 303 and the authentication unit 304 can also operate using the power from the power supply unit 301.

[0039] The pull-down resistor 306 connects the CC1 terminal of the socket 310 and GND, and has a value (here, 5.1 KΩ) specified in the USB PD standard or the USB Type-C standard.

[0040] The pull-down resistor 307 connects the CC2 terminal of the receptacle 310 to GND when selected by the switch 308. The pull-down resistor 307 has a value (here, 5.1 KΩ) specified in the USB PD standard or the USB Type-C standard.

[0041] The switch 308 selectively connects the CC2 terminal of the socket 310 to a power supply supplying a predetermined voltage or a pull-down resistor 307. Here, the power supply is the power supply unit 301, and it is assumed that the voltage of the power supply is 5.0V. The switch 308 is controlled by the PD communication unit 303. When PD communication with the cable 120 is performed, the PD communication unit 303 controls the switch 308 to connect the CC2 line to the power supply, thereby using the CC2 line as Vconn. In other cases, the PD communication unit 303 controls the switch 308 to connect the CC2 line to the pull-down resistor 307.

[0042] Despite Figure 2 Although not illustrated in the figure, a switch identical to the switch 308 is also provided between the CC1 line and the pull-down resistor 306, and the operation of the switch is also controlled by the PD communication unit 303. In the case where the CC1 line is used for PD communication with the power supply device 100, the PD communication unit 303 connects the CC1 line to the pull-down resistor 306. In the case where the CC1 line is used for PD communication with the cable 120, the switch 308 is controlled to connect the CC1 line to the power source, so that the CC1 line is used as Vconn. The power source is the power source unit 301 as is the power source connected to the CC2 line, and the voltage of the power source is 5.0V.

[0043] Next, we will refer to Figure 3 Describe the sequence of operations of the power supply system.

[0044] When the power receiving device 300 is connected to the cable 120 of the power supply device 100, step S301 is started. In step S301, the power supply device 100 detects that the power receiving device 300 as an external device has been connected to the power supply device 100. When the plug 130 of the cable 120 is connected to the socket 310 of the power receiving device 300, the pull-down resistor 306 is connected to the CC1 line. Therefore, the voltage of the CC1 line becomes a voltage (for example, 1.1V) that depends on the resistance of the pull-up resistor 106 and the pull-down resistor 306. The PD communication unit 121 that monitors the voltage of the CC1 line determines that the power receiving device 300 has been connected to the power supply device 100 when detecting the voltage change caused by the connection of the pull-down resistor 306 to the CC1 line. When the PD communication unit 121 detects the connection of the power receiving device 300, it notifies the control unit 102.

[0045] In step S302 , the control unit 102 , upon receiving a notification from the PD communication unit 121 indicating that the connection of the power receiving device 300 has been detected, causes the power supply unit 105 to start supplying power (eg, 5 V, 100 mA) to the VBUS line.

[0046] When the power receiving unit 305 of the power receiving device 300 detects the power supply to the VBUS line, step S303 is started. In step S303, the power receiving unit 305 detects that the power receiving device 300 as an external device has been connected to the power supply device 100.

[0047] If the cable 120 is not integrated, the power supply device 100 needs to perform authentication communication with the cable 120 after starting to supply power to the VBUS line. According to the first embodiment, the control unit 102 recognizes that the cable 120 is integrated (that is, authentication communication with the cable 120 is unnecessary). Therefore, the control unit 102 can start negotiation with the power receiving device 300 without performing authentication communication for the cable 120. In step S304, the PD communication unit 121 performs negotiation communication defined in the USB PD standard with the PD communication unit 303 via the CC1 line. In the negotiation communication, information related to the power supply capability of the power supply device 100 is sent to the power receiving device 300. A power request based on the power supply capability is sent from the power receiving device 300 to the power supply device 100.

[0048] In step S305, the negotiation communication is completed.

[0049] In step S306, the power receiving device 300, as an authentication initiator in the USB AUTH standard, performs authentication communication with the power supply device 100. In the authentication communication, the power receiving device 300 obtains authentication information from the power supply device 100 and determines whether the power supply device 100 is a predetermined device (a device that complies with the USB PD standard and the USB Type-C standard).

[0050] In step S307 , it is assumed that the power supply device 100 is determined to be a predetermined device (ie, the authentication communication with the power supply device has succeeded). In the case where the authentication communication with the power supply device 100 has succeeded, the process proceeds to step S308 .

[0051] In step S308, the power receiving device 300 performs a specific communication (Vconn_Swap communication) with the power supply device 100 as a preparatory operation for authentication communication with the cable 120 connecting the power receiving device 300 and the power supply device 100. Vconn_Swap communication is a communication used by a device for switching power supply to a circuit (e.g., a PD communication unit and an authentication unit) included in the cable 120 for authentication communication. According to the USB PD standard, a device that supplies Vconn can communicate with a cable. According to the USB PD standard, a power supply device (source) is specified to supply Vconn in an initial state. Therefore, in the case where the power receiving device (sink) communicates with the cable, it is necessary to make the power receiving device supply Vconn before communication. In order to switch the supply source of Vconn from the default power supply device 100 (source) to the power receiving device 300 (sink), the power receiving device 300 performs Vconn_Swap communication before communicating with the cable.

[0052] As previously described in the first embodiment, since the cable 120 does not have a PD communication unit and an authentication unit, the power supply device 100 does not supply Vconn to the cable 120. However, the power receiving device 300 does not know that the cable 120 is integrated in the power supply device 100. Therefore, according to the USB PD standard, the power receiving device 300 performs Vconn_Swap communication before performing authentication communication for the cable 120.

[0053] In step S308, PD communication unit 303 transmits a Vconn_Swap message. Upon receiving the Vconn_Swap message from PD communication unit 303, PD communication unit 121 transmits an acceptance message notifying permission to switch the Vconn supply source.

[0054] In step S309, when the PD communication unit 303 receives the acceptance message, it controls the switch 308 to switch the CC2 line from the state connected to GND through the pull-down resistor 307 to the state connected to a predetermined voltage power source. Therefore, power (Vconn) is supplied from the power receiving device 300 to the CC2 line.

[0055] According to the first embodiment, the cable 120 is integrated in the power supply device 100 and does not have a PD communication unit and an authentication unit. Figure 2 As shown, the CC2 line in the cable 120 is connected to GND via a pull-down resistor 206. Therefore, the Vconn supplied from the power receiving device 300 is not used for authentication communication for the cable 120. By not using Vconn for authentication communication, the power consumption of the power receiving device 300 can be reduced. Since the power receiving device 300 is generally a battery-driven device such as a mobile device, the reduction in power consumption of the power receiving device 300 allows the extension of the operable time.

[0056] In step S310, the power receiving device 300 performs authentication communication according to the USB AUTH standard to determine whether the cable 120 is a predetermined cable (a cable conforming to the USB standard). For example, the PD communication unit 303 performs authentication communication through communication (SOP* communication) targeting the cable 120 via the CC1 line.

[0057] In the USB PD standard, the destination of a message is specified by the start of a packet (SOP) in the message. Therefore, the PD communication unit 303 uses a message whose destination is the cable 120 (the plug connected to the power supply device 100) for authentication communication. According to the first embodiment, the PD communication unit 121 acts as a PD communication unit for the cable 120 by responding to messages whose destination is the cable 120 in addition to the messages whose destination is the power supply device 100. In the authentication communication, the PD communication unit 121 obtains authentication information related to the cable 120 from the authentication unit 122 in response to a request from the PD communication unit 303. Then, the PD communication unit 121 sends the authentication information related to the cable 120 to the PD communication unit 303.

[0058] In step S311, the PD communication unit 303 supplies the authentication information acquired in step S310 to the authentication unit 304. The authentication unit 304 determines whether the cable 120 is a predetermined cable (a cable that complies with the USB PD standard and the USB Type-C standard) by decrypting the authentication information using the certificate data. Here, it is assumed that the cable 120 has been determined to be a predetermined cable (that is, the authentication communication has succeeded).

[0059] By the success of the authentication communication for the power supply device 100 and the authentication communication for the cable 120, the power receiving device 300 can request the power supply device 100 for more power than the power requested in the negotiation communication in step S304. In step S312, the PD communication unit 303 sends a message requesting a change in the supplied power to the PD communication unit 121 through the PD communication via the CC1 line. For example, the PD communication unit 303 requests the power required to realize all functions of the power receiving device 300 based on the information related to the power supply capability of the power supply device 100 acquired in step S304. The PD communication unit 121 notifies the control unit 102 of the requested power based on the request message received from the PD communication unit 303.

[0060] In step S313 , the control unit 102 controls the power supply unit 105 to supply the requested power to the VBUS line.

[0061] In step S314 , the power receiving device 300 starts a process of receiving the power supplied to the power receiving device 300 from the power supply device 100 via the cable 120 .

[0062] The structures of the power supply device 100 and the power receiving device 300 and the power supply control operation according to the USB PD standard have been described above. According to the first embodiment, the PD communication unit 121 and the authentication unit 122 of the power supply device 100 with the integrated cable 120 can function as the PD communication unit and the authentication unit of the cable 120. Thus, the PD communication unit 121 can respond to the authentication communication for the cable 120. Therefore, the problem caused by the failure of the authentication communication for the cable 120 can be solved. In addition, since there is no need to set the PD communication unit and the authentication unit in the cable 120, the structure of the cable 120 can be simplified.

[0063] Next, we will refer to Figure 4 The illustrated flowchart further describes the operation of the PD communication unit 121 of the power supply device 100 .

[0064] When Figure 3 When the negotiation communication between the power supply device 100 and the power receiving device 300 in step S305 is completed, the power supply device 100 and the power receiving device 300 will enter a state where they can perform PD communication with each other. Thereafter, when the PD communication unit 121 receives communication from the PD communication unit 303, the PD communication unit 121 performs Figure 4 The operation shown.

[0065] In step S401, the PD communication unit 121 determines whether the destination of the communication (message) received from the PD communication unit 303 is the power supply device 100. As described above, the destination of the message is specified in the SOP. Therefore, the PD communication unit 121 can determine the communication destination based on the SOP of the message. In the case where it is determined in step S401 that the destination of the communication is the power supply device 100 (yes in step S401), the PD communication unit 121 performs the processing of step S407. In the case where it is determined that the destination of the communication received in step S401 is not the power supply device 100 (no in step S401), the PD communication unit 121 performs the processing of step S402.

[0066] In step S407 , PD communication unit 121 responds to the communication received in step S401 . For example, when receiving authentication communication in step S401 , PD communication unit 121 acquires authentication information related to power supply device 100 from authentication unit 122 and sends the authentication information to PD communication unit 303 .

[0067] In step S402, PD communication unit 121 determines whether the destination of the communication received in step S401 is cable 120. If it is determined that the destination of the communication received in step S401 is not cable 120 (No in step S402), PD communication unit 121 performs the process of step S403. If it is determined that the destination of the communication received in step S401 is cable 120 (Yes in step S402), PD communication unit 121 performs the process of step S404.

[0068] In step S403, PD communication section 121 determines that a communication error has occurred. If determined to be a communication error, PD communication section 121 does not respond to the received communication.

[0069] In step S404, the PD communication unit 121 determines whether specific communication (Vconn_Swap communication) has been received from the power receiving device 300. In the case where it is determined that Vconn_Swap communication has been received from the power receiving device 300 (Yes in step S404), the PD communication unit 121 performs the process of step S406. In the case where it is not determined that Vconn_Swap communication has been received from the power receiving device 300 (No in step S404), the PD communication unit 121 performs the process of step S405.

[0070] In step S405, the PD communication unit 121 does not respond to the communication received in step S401. As described above, in the case where the power receiving device 300 communicates with the cable, it is necessary to switch the Vconn supply source to the power receiving device 300 before the communication. Therefore, in the case where a communication whose destination is the cable is received before the Vconn_Swap communication for switching the Vconn supply source to the power receiving device 300, the PD communication unit 121 does not respond to the communication whose destination is the cable.

[0071] In step S406, PD communication unit 121 responds to the communication received in step S401. Unlike step S407, PD communication unit 121 responds to the communication as the PD communication unit of cable 120. For example, in the case where the communication received in step S401 is authentication communication, PD communication unit 121 obtains authentication information related to cable 120 from authentication unit 122 and sends the authentication information to PD communication unit 303.

[0072] As described above, according to the first embodiment, in the power supply device 100 with the integrated cable 120, the PD communication unit 121 is configured to be able to respond to the authentication communication of the power supply device 100, and also to be able to respond to the authentication communication of the cable 120. In addition, the authentication information of the power supply device 100 and the authentication information of the cable 120 are stored in the memory of the authentication unit 122. Therefore, the power supply device 100 can be appropriately used for the authentication communication of the cable 120 from the power receiving device 300. Therefore, with respect to the power supply device 100 with the integrated cable 120, the problem that the authentication communication for the power supply device 100 has succeeded but the authentication communication for the cable 120 has failed can be avoided.

[0073] According to the first embodiment, since the structure for authentication communication with the power supply device 100 and the structure for authentication communication with the cable 120 have been commonalized, the structure of the power supply device 100 can be simplified.

[0074] [Second embodiment] According to the first embodiment, in the case where a communication whose destination is a cable is received before receiving the Vconn_Swap communication, the power supply device 100 simply does not respond to the communication and does not perform any other operation. However, the power receiving device that performs communication whose destination is a cable without the Vconn_Swap communication is not a device that complies with the USB PD standard. Therefore, in step S405, the PD communication unit 121 can notify the control unit 102 that the power receiving device does not comply with the USB PD standard. Then, upon receiving the notification, the control unit 102 can control the power supply unit 105 so as to limit the power supply to the power receiving device 300.

[0075] For example, the control unit 102 may supply less power than the power started to be supplied after the negotiation communication (step S304), or may stop supplying power. Therefore, the power supply device 100 can supply power to the power receiving device 300 that does not comply with the USB PD standard with greater emphasis on safety.

[0076] According to the first embodiment, Vconn supplied from the power receiving device 300 is pulled down to GND, and the PD communication unit 121 and the authentication unit 122 are also operated by the power from the power supply unit 105 in the authentication communication for the cable 120. However, in the case of performing authentication communication with the cable 120, the PD communication unit 121 and the authentication unit 122 can operate by Vconn supplied by the power receiving device 300.

[0077] In this case, a switch for switching the path for supplying power to the PD communication unit 121 and the authentication unit 122 between the path from the power supply unit 105 and the path from the CC2 line is provided in the power supply device 100. Then, during the period when the power receiving device 300 supplies Vconn to the CC2 line, the switch is controlled to operate the PD communication unit 121 and the authentication unit 122 with the power from the CC2 line. Note that there is a case where the Vconn that can be supplied by the power receiving device 300 is insufficient to operate the PD communication unit 121 and the authentication unit 122. In this case, the PD communication unit 121 and the authentication unit 122 also operate with the power from the power supply unit 105 while the power receiving device 300 supplies Vconn to the CC2 line.

[0078] [Third Embodiment] The various functions, processes or methods described in the first and second embodiments may also be implemented by a personal computer, a microcomputer, a CPU (central processing unit) or a microprocessor that executes a program. Hereinafter, in the third embodiment, a personal computer, a microcomputer, a CPU (central processing unit) or a microprocessor is referred to as "computer X". In the third embodiment, a program for controlling computer X and implementing the various functions, processes or methods described in the first and second embodiments is referred to as "program Y".

[0079] The various functions, processes or methods described in the first and second embodiments are implemented by computer X executing program Y. In this case, program Y can be supplied to computer X via a computer-readable storage medium. The computer-readable storage medium in the third 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 or a non-volatile memory, etc. The computer-readable storage medium of the third embodiment is a non-transitory storage medium.

[0080] Although various embodiments of the present disclosure have been described with reference to exemplary embodiments, it should be understood that aspects of the present disclosure are not limited to the exemplary embodiments. The scope of the claims should be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures.

Claims

1. An electronic device having a cable and supplying power to an external device connected to the electronic device via the cable, wherein: The cable is integrated with the electronic device and does not have an authentication unit for authentication communication for the cable, the electronic device comprising: a storage component for storing first authentication information used for authentication communication with respect to the electronic device and second authentication information used for authentication communication with respect to the cable; and a communication component capable of responding to authentication communication from the external device to the electronic device, and also capable of responding to authentication communication from the external device to the cable, when the external device is connected to the electronic device via the cable, Wherein, when the authentication communication received from the external device is directed to the electronic device, the communication component responds using the first authentication information, and when the authentication communication received from the external device is directed to the cable, the communication component responds using the second authentication information.

2. The electronic device according to claim 1, wherein: When the authentication communication received from the external device is for the cable, the communication section determines whether a predetermined communication for a preparation operation for the cable has been received from the external device before receiving the authentication communication for the cable before responding to the authentication communication for the cable.

3. The electronic device according to claim 2, further comprising: a power supply component, configured to supply power to the external device connected to the cable via the cable; as well as a control component, used for controlling the power supply of the power supply component, Here, the control means limits the power supply by the power supply means when it is not determined that the predetermined communication has been received from the external device before the authentication communication for the cable is received.

4. The electronic device according to claim 2, wherein: The power supply via the cable complies with the USB PD standard, and the predetermined communication corresponds to Vconn_Swap communication. 5 . The electronic device according to claim 1 , wherein the electronic device has a plug or a socket capable of being connected to the external device without using the cable.

6. A control method for an electronic device, the electronic device having a cable and used to supply power to an external device connected to the electronic device via the cable and further having a storage component, the storage component storing first authentication information for authentication communication with respect to the electronic device and second authentication information for authentication communication with respect to the cable, wherein: The cable is integrated with the electronic device and does not have an authentication unit for authentication communication for the cable, and the control method includes: responding to an authentication communication received from the external device for the electronic device by using the first authentication information; and An authentication communication for the cable received from the external device is responded to by using the second authentication information.

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