JP2021177683A - Power receiving device, method for controlling the same, and program - Google Patents

Abstract

To provide a technique to further improve safety in power reception from a power supply device performed by a power receiving device.SOLUTION: There is provided a power receiving device comprising: an interface that is capable of data communication and power reception based on a predetermined power supply standard; control means that controls to receive a first power from a power supply device through the interface; first determination means that, based on a predetermined authentication standard, acquires authentication information including identification information on the power supply device from the power supply device through the interface to determine whether the authentication information is authentic; and second determination means that, based on the identification information, determines whether the power supply device has passed an adaptability test for the predetermined power supply standard. When the authentication information is determined to be authentic, and the power supply device is determined to have passed the adaptability test, the control means controls to receive a second power larger than the first power.SELECTED DRAWING: Figure 4A

Description

The present invention relates to a power receiving device, a control method thereof, and a program.

Some wired interfaces for communication used in electronic devices such as digital cameras in recent years can transmit electric power in parallel with data transfer, such as USB (Universal Serial Bus). The standard for USB has been established by the USB standard promotion organization USB-IF (USB Implementers Forum, Inc.), which is a non-profit organization. USB-IF is also in the process of certifying that electronic devices comply with the USB standard.

USB-IF has established various standards related to USB, one of which is the USB-PD (USB-Power Delivery) standard. According to the USB-PD standard, it is possible to supply a large amount of power up to 100 W from a power supply device such as a USB host controller or an AC adapter to a power receiving device connected via a USB cable. As the amount of electric power handled between connected devices increases, further improvement in safety is required.

Therefore, a USB-AUTO (USB-AUTHENTICATION) standard is defined that enables authentication communication between connected devices to determine whether or not they are mutually reliable devices. According to the USB-AUTO standard, each electronic device stores the certificate issued by USB-IF as electronic information in the device, and exchanges the certificate between the devices by communication encrypted by a predetermined process. By doing so, authentication is possible.

Patent Document 1 is a power supply device that performs USB-AUTO communication with a USB cable connecting devices as a safety control using authentication communication based on the USB-AUTO standard, and controls the power supplied according to the result of authentication. Discloses the technology related to.

JP-A-2018-97643

The certificate required for certification by USB-AUTO communication is issued by USB-IF even if it is an electronic device or USB cable that has not passed the compliance test to confirm that it conforms to the USB standard. Can receive. Therefore, the electronic device and the USB cable do not always conform to the USB standard even when they are authenticated by USB-AUTO communication, but Patent Document 1 does not consider this point.

Here, consider a case where the power receiving device receives power from a power feeding device authenticated by USB-AUTO communication. In this case, the power supply device does not always conform to the USB standard. Therefore, if the power is controlled based only on the result of the USB-AUTO communication authentication, the power supply device may start from the power supply device that does not conform to the USB standard. There is a possibility of receiving power supply.

The present invention has been made in view of such a situation, and an object of the present invention is to provide a technique for further improving the safety of receiving power from a power receiving device by a power receiving device.

In order to solve the above problems, the present invention provides an interface capable of receiving power based on data communication and a predetermined power supply standard, and a control means for controlling to receive the first power from the power supply device via the interface. A first determination means for acquiring authentication information including identification information of the power supply device from the power supply device via the interface and determining whether or not the authentication information is genuine based on a predetermined authentication standard. And a second determination means for determining whether or not the power supply device has passed the conformity test of the predetermined power supply standard based on the identification information, and determines that the authentication information is genuine. If it is determined that the power feeding device has passed the conformity test, the control means controls to receive a second power larger than the first power from the power feeding device. Provide a characteristic power receiving device.

According to the present invention, it is possible to further improve the safety of receiving power from the power receiving device by the power receiving device.

In addition, other features and advantages of the present invention will be further clarified by the accompanying drawings and the description in the embodiment for carrying out the following invention.

system configuration diagram. The block diagram which shows the structure of the power receiving device 200. The block diagram which shows the structure of the portable wireless device 300. The flowchart of power receiving control which concerns on 1st Embodiment. The flowchart of the modification of the power receiving control which concerns on 1st Embodiment. The figure which shows an example of the USB conformity list (compatibility management information). The flowchart which shows the detail of the 2nd authentication process in S407 of FIG. 4A. The flowchart of the update process of the USB conformity list which concerns on 2nd Embodiment. The sequence chart of the update process of the USB conformity list which concerns on 3rd Embodiment. (A) A flowchart of the XID storage process according to the third embodiment, and (b) an example of a USB compatibility list including the added XID. The figure explaining the sharing example of the USB conformity list. The flowchart of power receiving control which concerns on 4th Embodiment. The figure which shows the display example of the information (message) in the power receiving control which concerns on 4th Embodiment.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. The following embodiments do not limit the invention according to the claims. Although a plurality of features are described in the embodiment, not all of the plurality of features are essential to the invention, and the plurality of features may be arbitrarily combined. Further, in the attached drawings, the same or similar configurations are given the same reference numbers, and duplicate explanations are omitted.

[First Embodiment]
● System configuration FIG. 1 is a system configuration diagram according to the first embodiment. In FIG. 1, 200 is a power receiving device as an electronic device. In the present embodiment, a digital camera will be used as an example of the power receiving device, but the power receiving device of the present embodiment is not limited to the digital camera and can be applied to any kind of power receiving device.

Reference numeral 210 denotes a connection portion for connecting the power receiving device 200 to the external device, and in the present embodiment, the USB TYPE-C connector will be used as an example. The connection unit 210 (interface) is configured to be capable of data communication and power reception based on the USB-PD standard.

Reference numeral 120 denotes a cable, and in the present embodiment, a USB cable will be used as an example. When an external device is connected to the connection unit 210 via the cable 120, the power receiving device 200 can receive power from the external device or perform data communication with the external device.

Reference numeral 130 denotes a power feeding device as an external device. Here, the AC adapter will be described as an example, but the power supply device 130 may be a mobile battery, another electronic device having a power source, or the like.

Reference numeral 300 denotes a portable wireless device as an external device, and in the present embodiment, a smartphone will be described as an example. However, the portable wireless device 300 may be another electronic device such as a personal computer (PC).

Reference numeral 350 denotes a wireless communication medium, which conforms to communication standards such as Wi-Fi (registered trademark) and Bluetooth (registered trademark). The portable wireless device 300 is connected to the power receiving device 200 via the wireless communication medium 360. Through this connection, the portable wireless device 300 can, for example, view recorded images and live view images in the digital camera of the power receiving device 200, and control camera shooting. Reference numeral 360 denotes a wireless communication medium, which conforms to a communication standard such as 4G or 5G. The portable wireless device 300 can be accessed on the WEB via the wireless communication medium 370. In the present embodiment, an example in which the power receiving device 200 and the portable wireless device 300 are connected via the wireless communication medium 360 will be described, but the communication between the power receiving device 200 and the portable wireless device 300 is limited to wireless communication. Instead, it may be wired communication.

Reference numeral 150 denotes a cloud server as an external device. The portable wireless device 300 can access the cloud server 150 via the wireless communication medium 370. The cloud server 150 stores information (referred to as a "USB compatibility list") that links the XID and the USB compatibility information. XID is product-specific identification information possessed by electronic devices and cables (hereinafter collectively referred to as "USB products") that support the USB standard. Here, the fact that the XID is "product-specific" means that the XID is assigned in the unit of the model number of the USB product. Therefore, a plurality of USB products having the same model number have the same XID. The USB conformity information is information indicating whether or not the USB product has passed the compliance test of the USB standard (or is being tested). Passing the compliance test is proof that it conforms to the USB standard, so it is important to ensure connection compatibility.

● Configuration of the power receiving device 200 FIG. 2 is a block diagram showing a configuration of the power receiving device 200. In FIG. 2, the connection portion 210 is, for example, a USB Type-C connector as described with reference to FIG. Reference numeral 201 denotes a power receiving unit connected to a power supply terminal (for example, a VBUS terminal) of the connecting unit 210, which controls the power supplied from the power feeding device 130 shown in FIG. 1 via the cable 120. Reference numeral 202 denotes a battery such as a lithium ion battery. The power receiving unit 201 includes a DC / DC converter, a charging circuit, and the like, and is configured to charge the battery 202 using the electric power received via the connecting unit 210.

Reference numeral 203 denotes a power supply control unit including a DC / DC converter and the like, which supplies electric power to various circuits included in the power receiving device 200 by using the electric power from the power receiving unit 201 or the battery 202. Reference numeral 204 denotes a PD communication unit connected to the communication terminal (for example, CC terminal) of the connection unit 210, and is a USB-PD standard (predetermined) between the power supply device 130 and the IC built in the cable 120 shown in FIG. Data communication is performed based on the power supply standard of. The PD communication unit 204 also determines whether or not the connected power supply device 130 and the cable 120 support the USB-PD standard. The power receiving device 200 performs negotiation communication based on the communication protocol defined in the USB-PD standard by the PD communication unit 204, and requests the power feeding device 130 to supply desired power.

Reference numeral 205 denotes an authentication unit, which is composed of, for example, a security chip. The authentication unit 205 has a built-in non-volatile memory, and electronic information of the certificate issued from the USB-IF is stored in advance. The PD communication unit 204 receives electronic information including an encrypted certificate from each of the power supply device 130 and the cable 120 by communication specified in the USB-PD standard, and transmits the electronic information to the authentication unit 205. The authentication unit 205 decodes the electronic information sent from the PD communication unit 204 by a predetermined process specified in the USB-AUTO standard (predetermined authentication standard), so that the connected power supply device 130 and cable 120 can be connected. Each of them authenticates whether or not it is trusted by USB-IF (first authentication). Further, the authentication unit 205 also acquires the XIDs of the power supply device 130 and the cable 120 by decoding the electronic information of the power supply device 130 and the cable 120 sent from the PD communication unit 204.

Reference numeral 206 denotes an image pickup unit including an image pickup lens that zooms and focuses on the subject image, an image pickup element that converts the subject image into electrical image information, and the like. The image information acquired by the image capturing unit 206 is subjected to image processing such as compression processing by the control unit 250 and recorded on the recording medium 209.

Reference numeral 207 is an operation unit including buttons, a touch panel, and the like, which is used by the user to operate the power receiving device 200. Reference numeral 208 denotes a display unit composed of an LCD or the like, which is used for displaying a state or displaying an image of a digital camera which is a power receiving device 200. 209 is a recording medium such as a memory card or a hard disk.

Reference numeral 211 denotes a non-volatile memory composed of a NOR flash memory, a NAND flash memory, or the like, which is used to store a control program of the power receiving device 200, image data, or the like. The non-volatile memory 211 may have a removable form such as an SD card. Here, the non-volatile memory 211 is also used to store the USB compatibility list that links the XID and the USB compatibility information. For example, the USB compatibility list is stored in the non-volatile memory 211 in advance before the power receiving device 200 is shipped. Alternatively, the power receiving device 200 may acquire the USB compatibility list from the cloud server 150 via the portable wireless device 300 and store it in the non-volatile memory 211 according to the operation by the user. In addition, the power receiving device 200 can update the USB compatibility list stored in the non-volatile memory 211. The control related to updating the USB compatibility list will be described later.

Reference numeral 212 denotes a wireless unit conforming to Wi-Fi (registered trademark), Bluetooth (registered trademark), etc., and is used for data communication with an external device. As described with reference to FIG. 1, the wireless unit 212 (interface capable of data communication) is used for data communication via the portable wireless device 300 and the wireless communication medium 360.

Reference numeral 250 denotes a control unit that controls the entire power receiving device 200. The control unit 250 has, for example, a microprocessor and a RAM built-in, and controls the operation of the entire power receiving device 200 by loading and executing a control program stored in advance in the non-volatile memory 211 into the RAM. The control program referred to here is a program for executing various flowcharts described later in this embodiment. Further, the control unit 250 has a configuration capable of determining that the power feeding device 130 and the cable 120 are connected to the connection unit 210 via the power receiving unit 201 and the PD communication unit 204.

Reference numeral 213 is a control block inside the control unit 250, which is an information update determination unit for updating the USB compatibility list that links the XID and the USB compatibility information. The information update determination unit 213 determines that the USB compatibility list is updated in response to the determination by the control unit 250 that the power supply device 130 and the cable 120 are connected to the connection unit 210, for example. Not limited to this, the information update determination unit 213 may determine that it will be updated as appropriate when the USB compatibility list can be obtained from an external device. For example, the information update determination unit 213 determines that the USB compatibility list is updated when it is determined that the wireless unit 212 is connected to an external device or when a predetermined user input is performed using the operation unit 207. You may.

Reference numeral 214 denotes a control block inside the control unit 250, and when the information update determination unit 213 determines that the USB compatibility list is to be updated, the USB compatibility list is obtained from a connected external device by wired or wireless data communication. It is an information acquisition unit that controls the operation. The information acquisition unit 214 obtains a USB compatibility list from an external device connected via the connection unit 210, for example, using communication specified in the USB standard. As another example, the information acquisition unit 214 may use the wireless unit 212 to connect to an external device or the cloud server 150 by wireless communication to obtain the USB compatibility list, or the USB stored in the recording medium 209. You may get a conformance list.

Reference numeral 215 is a control block inside the control unit 250, which receives the USB compatibility list obtained from the information acquisition unit 214, determines whether to update the USB compatibility list already stored in the non-volatile memory 211, and updates the USB compatibility list. It is an information update unit that performs. The detailed processing of the information update unit 215 will be described later.

● Configuration of the portable wireless device 300 FIG. 3 is a block diagram showing a configuration of the portable wireless device 300. Reference numeral 301 denotes an operation unit composed of buttons, a touch panel, and the like, which is used by a user to operate the portable wireless device 300. As described with reference to FIG. 1, it is possible to perform operations such as shooting control and image viewing of the power receiving device 200.

Reference numeral 302 denotes a display unit composed of an LCD or the like, which is used for displaying the status of the portable wireless device 300 and displaying an image. As a result, the user can view the image of the power receiving device 200, check the live view image, and the like.

Reference numeral 303 denotes a non-volatile memory composed of a NOR flash memory, a NAND flash memory, or the like, which is used to store a program, image data, or the like of the portable wireless device 300. The non-volatile memory 303 is also used to store a USB compatibility list that links the XID and the USB compatibility information. The non-volatile memory 303 may be in a removable form such as an SD card.

Reference numeral 304 denotes a wireless unit conforming to Wi-Fi (registered trademark), Bluetooth (registered trademark), etc., and is used for data communication with an external device. As described with reference to FIG. 1, the radio unit 304 is used for data communication with the power receiving device 200.

The 305 is a wireless unit for performing mobile communication according to standards such as 4G and 5G, and is used not only for voice data for telephone calls but also for WEB access by high-speed data communication. As described with reference to FIG. 1, the portable wireless device 300 also uses the wireless unit 305 when accessing the cloud server 150 on the WEB.

● Power reception control FIG. 4A is a flowchart of power reception control according to the first embodiment. When the control unit 250 detects that the power supply device 130 is connected to the connection unit 210 via the cable 120, the control unit 250 starts the process of this flowchart.

In S401, the PD communication unit 204 starts transmitting and receiving information based on the communication protocol of the USB-PD standard with the power supply device 130.

In S402, the PD communication unit 204 determines whether or not the power supply device 130 supports the USB-PD standard. If the power supply device 130 supports the USB-PD standard, the processing step proceeds to S403, otherwise the processing step proceeds to S411.

Here, the PD communication unit 204 determines whether or not the power supply device 130 supports the PD standard according to whether or not communication based on the communication protocol of the USB-PD standard is received from the power supply device 130. .. The PD communication unit 204 determines that the power supply device 130 supports the USB-PD standard when the communication based on the communication protocol of the USB-PD standard can be correctly received within a predetermined period. On the contrary, in the PD communication unit 204, when the communication based on the communication protocol of the USB-PD standard cannot be correctly received, or when the communication cannot be received within a predetermined period, the power supply device 130 causes the USB-PD. Judge that the standard is not supported. The predetermined period may be any period specified in the USB-PD standard, and may be, for example, a period of 310 ms. Further, the communication based on the communication protocol of the USB-PD standard is the Source Capacity Message communication including the power information that can be supplied by the power supply device 130. In the present embodiment, as an example, the communication from the power feeding device 130 transmits electric power of 2.5W (5V, 500mA), 15W (5V, 3A), 27W (9V, 3A), and 30W (15V, 2A). It shall include power information indicating that each can be supplied.

In S403, the PD communication unit 204 transmits / receives information based on the communication protocol of the USB-PD standard, and requests the _{power supply device 130 to supply the electric power P 11.} Here, the electric power P ₁₁ may be the minimum electric power that the power receiving device 200 can execute the first authentication process of S405 and the second authentication process of S407. Further, the electric power P ₁₁ is determined by selecting from the electric power information that can be supplied by the power feeding device 130 received in S402. In the present embodiment, as an example, the electric power P ₁₁ is assumed to be 2.5 W (5 V, 500 mA).

In S404, the power receiving unit 201 controls the electric power P ₁₂ (first electric power) supplied from the power feeding device 130 so as not to exceed the _{electric power P 11 based on the control from the control unit 250. In the present embodiment, the power receiving unit 201 controls the power P 12} (first power) so as not to exceed the _{power P 11} by controlling the current value supplied from the power feeding device 130 to 500 mA or less. Here, the power receiving unit 201 uses the supplied power P ₁₂ to supply the power required for the power receiving device 200 to execute the first authentication process of S405 and the second authentication process of S407. Supply to each part. Further, in order to prevent the power for the first authentication process and the second authentication process from being insufficient, the blocks that are not involved in the execution of the first authentication process and the second authentication process in the power receiving device 200 are included in the power receiving device 200. The operation may be restricted so as to reduce power consumption.

In S405, the power receiving device 200 attaches to each of the power feeding device 130 and the cable 120 in order to confirm that the power feeding device 130 and the cable 120 connected to the power receiving device 200 are each trusted by USB-IF. Perform the first authentication process. The first authentication process includes transmission / reception of information based on the USB-PD standard by the PD communication unit 204 and processing based on the USB-AUTO standard by the authentication unit 205.

The first authentication process for the power feeding device 130 will be specifically described. The PD communication unit 204 receives predetermined authentication information based on the communication protocol of the USB-AUTO standard from the power supply device 130. The predetermined authentication information is the electronic information of the encrypted certificate issued by USB-IF. If the PD communication unit 204 cannot correctly receive the predetermined authentication information within the predetermined period, the test unit 205 determines that the power supply device 130 is not trusted by the USB-IF. The predetermined period may be any period specified in the USB-PD standard, and may be, for example, a period of 4.5 s. When the PD communication unit 204 correctly receives the predetermined authentication information within the predetermined period, the PD communication unit 204 sends the received authentication information to the authentication unit 205.

The authentication unit 205 performs a predetermined authentication process specified by the USB-AUTO standard on the predetermined authentication information. When the predetermined authentication process fails, the authentication unit 205 determines that the power supply device 130 is not trusted by the USB-IF. Further, the authentication unit 205 determines that the power supply device 130 is trusted by the USB-IF when the predetermined authentication process is successful. Here, the predetermined authentication process is a decryption process for the encrypted certificate, and it is possible to determine whether or not the authentication information is genuine. Further, when the predetermined authentication process is successful, the authentication unit 205 acquires the XID (identification information of the USB product) included in the electronic information of the decrypted certificate.

The first authentication process for the cable 120 is the same as the first authentication process for the power supply device 130. The power receiving device 200 may perform the first authentication process only on one of the power feeding device 130 and the cable 120.

In S406, the authentication unit 205 determines whether or not the power supply device 130 and the cable 120 are each trusted by USB-IF based on the result of the first authentication process of S405. If the power supply device 130 and the cable 120 are trusted by the USB-IF (if the first authentication process is successful), the process step proceeds to S407. If the power supply device 130 or the cable 120 is not trusted by the USB-IF (if the first authentication process fails), the process step proceeds to S411.

When the first authentication process is performed only on one of the power supply device 130 and the cable 120 in S405, the conditional branch of S406 is the USB product (for example, the power supply device 130) on which the first authentication process is performed. ) Is performed based on the authentication result.

In S407, the control unit 250 performs a second authentication process for confirming whether or not the power supply device 130 and the cable 120 conform to the USB standard (whether or not the USB standard conformity test has been passed). The second authentication process is performed by collating the USB compatibility list stored in advance in the non-volatile memory 211 based on the XIDs of the power supply device 130 and the cable 120 acquired in S406.

Here, an example of the USB compatibility list (compatibility management information) will be described with reference to FIG. 5A. In FIG. 5A, 500 is a USB compatibility list. 501 indicates one or more XIDs (XID lists) included in the USB compatibility list 500. 502 indicates USB conformity information associated with each XID. The USB conformance information 502 is, for example, "OK" indicating that the corresponding USB product conforms to the USB standard, "NG" indicating that it does not conform, or "testing" indicating that the product is being tested. Has a value. The USB conformity information 502 associated with the XID "0x9ABC_DEF0" is "NG".

503 indicates the version information of the USB compatibility information associated with each XID. The version information 503 stores a numerical value or a character string representing the version, for example, "0.1", "1.0", "2.0". In the example of FIG. 5A, the larger the numerical value of the version information 503, the newer the information of the corresponding USB conformity information 502 and the extended area 504.

Reference numeral 504 indicates an extension area associated with each XID. Information about each XID other than USB conformity information is stored in the expansion area 504. Any information other than the USB conformity information may be stored in the expansion area 504 as long as it is information associated with each XID. The information in the expansion area 504 may be updated with new information associated with each XID when the USB compatibility list described later is updated. Further, for example, when it is determined by the user's menu selection or operation by the operation unit 207 that the power is not received from the USB product corresponding to the specific XID, the information in the expansion area 504 may be updated. In the example of FIG. 5A, it is determined that power is not received from the USB product having the XID "0x789A_1234" by the user's menu selection or operation by the operation unit 207, and the expansion area 504 is linked to the XID "0x789A_1234". In addition, the value of "NG" (power reception restriction information) is stored. Of course, FIG. 5A is an example, and the configuration of the USB compatibility list is not limited to the configuration shown in FIG. 5A.

As described above, in S407 of FIG. 4A, the control unit 250 collates the USB compatibility list 500 based on the XID acquired in S406.

As an example, consider the case where the XID of the power feeding device 130 is "0x1234_5678" and the XID of the cable 120 is "0x9ABC_DEF0". In this case, in the USB compatibility list 500 of FIG. 5A, the USB compatibility information 502 associated with the XID of the power supply device 130 is "OK", and the control unit 250 determines that the power supply device 130 conforms to the USB standard. .. Further, the USB conformity information 502 associated with the XID of the cable 120 is "NG", and the control unit 250 determines that the cable 120 does not conform to the USB standard.

As another example, consider the case where the XID of the power feeding device 130 is "0x1234_5678" and the XID of the cable 120 is "0x789A_1234". In this case, in the USB compatibility list 500 of FIG. 5A, the USB compatibility information 502 associated with the XID of the power supply device 130 is "OK", and the control unit 250 determines that the power supply device 130 conforms to the USB standard. .. Further, the USB conformity information 502 associated with the XID of the cable 120 is "OK", and the control unit 250 determines that the cable 120 conforms to the USB standard. However, the expansion area 504 associated with the XID of the cable 120 is "NG". Therefore, the control unit 250 may determine that the cable 120 does not conform to the USB standard regardless of the USB conformity information 502 associated with the XID of the cable 120, and may determine that the second authentication process has failed. .. As described above, the control unit 250 may perform the second authentication process based on the information of the expansion area 504 in addition to the USB conformity information 502.

The USB compatibility list 500 does not have to include the USB compatibility information 502. In this case, the control unit 250 indicates that the XID list 501 shows the XID of the USB product that has passed the conformance test. Therefore, for example, when the XID of the power feeding device 130 is included in the USB conformity list 500, the control unit 250 determines that the power feeding device 130 has passed the conformity test.

Further details of the second authentication process of S407 will be described later with reference to FIG. 5B. The power receiving device 200 may perform the second authentication process only on one of the power feeding device 130 and the cable 120.

In S408, the control unit 250 determines whether or not the power feeding device 130 and the cable 120 conform to the USB standard, respectively, based on the result of the second authentication process of S407. If the power supply device 130 and the cable 120 conform to the USB standard (if the second authentication process is successful), the process step proceeds to S409. If the power supply device 130 or the cable 120 does not conform to the USB standard (if the second authentication process fails), the process step proceeds to S411.

When the second authentication process is performed only on one of the power supply device 130 and the cable 120 in S407, the conditional branch of S408 is the USB product (for example, the power supply device 130) on which the second authentication process is performed. ) Is performed based on the authentication result.

In S409, the PD communication unit 204 transmits / receives information based on the communication protocol of the USB-PD standard, and supplies the power P _{21 to the power supply device 130 based on the power information that can be supplied from the power supply device 130.} To request. Here, the electric power P ₂₁ may be an electric power exceeding the electric _{power P 11.} Further, the electric power P ₂₁ may be the electric power required for the operation of the power receiving device 200. Further, the electric power P ₂₁ is determined by selecting from the electric power information that can be supplied by the power feeding device 130 received in S402. In the present embodiment, as an example, the electric power P ₂₁ is assumed to be 30 W (15 V, 2 A).

In S410, the power receiving unit 201 controls the electric power P ₂₂ (second electric power) supplied from the power feeding device 130 so as not to exceed the _{electric power P 21 based on the control from the control unit 250. In the present embodiment, the power receiving unit 201 controls the power P 22} (second power) so as not to exceed the _{power P 21} by controlling the current value supplied from the power feeding device 130 to 2 A or less. Here, the power receiving unit 201 uses the supplied electric power P ₂₂ to supply necessary electric power to each unit of the power receiving device 200. Incidentally, the power receiving apparatus 200 releases the restriction of the operations performed in S404, greater power (except that the does not exceed the power P ₂₁₎ may switch the operation setting of each unit of the power receiving apparatus 200 to consume ..

In S402, it is determined that the power supply device 130 does not support the USB-PD standard, in S406 it is determined that the first authentication process has failed, and in S408 it is determined that the second authentication process has failed. If so, the process of S411 is executed. In S411, the control unit 250 controls the power receiving unit 201 to stop receiving power from the power feeding device 130, and ends the power receiving control in this flowchart. Further, the PD communication unit 204 may stop the communication process.

In S411, the control unit 250 may control the power receiving unit 201 to limit the power received from the power feeding device 130 instead of completely stopping the power receiving. The electric power received from the power feeding device 130 may be lower than 2.5 W (5 V, 500 mA), for example.

The control unit 250 may perform different processing depending on which of S402, S406, and S408 the processing step has transitioned to S411. For example, when the processing step transitions from S402 to S411, the power supply device 130 does not support the USB-PD standard. Therefore, the control unit 250 controls to stop receiving power. When the processing step transitions from S406 to S411, the power supply device 130 supports the USB-PD standard, but it cannot be confirmed that it was manufactured by a reliable manufacturer. Therefore, the control unit 250 controls so as to receive a relatively small electric power such as 0.5 W (5 V, 100 mA). When the processing step transitions from S408 to S411, it can be confirmed that the power supply device 130 supports the USB-PD standard and is manufactured by a reliable manufacturer, but it cannot be confirmed that it conforms to the USB standard. Therefore, the control unit 250, for example, such as 2.5 W (5V, 500mA), controls to receiving a relatively large power within a range that does not exceed the power _{P 11.}

Next, the details of the second authentication process in S407 of FIG. 4A will be described with reference to FIG. 5B. Here, the second authentication process for the power feeding device 130 will be described as an example, but the same applies to the second authentication process for the cable 120.

In S501, the control unit 250 collates the XID of the power supply device 130 acquired by the first authentication process (S406 of FIG. 4A) with the XID list 501 of the USB compatibility list 500, and matches the XID list 501. It is determined whether or not there is an XID to be used. If an XID matching the power supply device 130XID is present in the XID list 501, the processing step proceeds to S502, otherwise the processing step proceeds to S506. For example, if the XID of the power feeding device 130 is "0x1234-5678", the processing step proceeds to S502 because the matching XID "0x1234-5678" exists in the XID list 501.

In S502, the control unit 250 determines whether or not the USB compatibility information 502 associated with the XID of the power supply device 130 in the USB compatibility list 500 is "OK" (information indicating that the USB product conforms to the USB standard). Is determined. If the USB conformity information 502 associated with the XID of the power feeding device 130 is "OK", the processing step proceeds to S503, and if not, the processing step proceeds to S506. For example, if the XID of the power supply device 130 is "0x1234-5678", the corresponding USB conformity information 502 is "OK" (information indicating that the USB product conforms to the USB standard), so the processing step is S503. Proceed to.

In S503, the control unit 250 determines whether or not the information of the expansion area 504 associated with the XID of the power feeding device 130 exists in the USB compatibility list 500. If the information of the expansion area 504 associated with the XID of the power feeding device 130 exists, the processing step proceeds to S504, and if not, the processing step proceeds to S505. For example, if the XID of the power feeding device 130 is "0x1234-5678", the processing step proceeds to S505 because the information of the corresponding expansion area 504 does not exist. As another example, assuming that the XID of the power feeding device 130 is "0x789A_1234", the processing step proceeds to S504 because the information of the corresponding expansion region 504 exists.

In S504, the control unit 250 determines whether or not the information of the expansion area 504 associated with the XID of the power feeding device 130 is "NG". If the information of the expansion area 504 associated with the XID of the power feeding device 130 is "NG", the processing step proceeds to S506, and if not, the processing step proceeds to S505. For example, if the XID of the power feeding device 130 is "0x789A_1234", the processing step proceeds to S506 because the information of the corresponding expansion area 504 is "NG".

In S505, the control unit 250 determines that the power supply device 130 conforms to the USB standard. Therefore, when the USB conformity information 502 corresponding to the XID of the power feeding device 130 is "OK" and "NG" does not exist in the expansion area 504 corresponding to the XID of the power feeding device 130, a second second with respect to the power feeding device 130. The authentication process is successful.

On the other hand, in S506, the control unit 250 determines that the power feeding device 130 does not conform to the USB standard. Therefore, if the XID of the power supply device 130 does not exist in the XID list 501, the corresponding USB conformity information 502 is not "OK", or the corresponding expansion area 504 is "NG", a second with respect to the power supply device 130. Authentication process fails.

The control unit 250 may perform the second authentication process without using the information of the expansion area 504. In this case, the processes of S503 and S504 are not executed, and if the USB conformity information 502 corresponding to the XID of the power feeding device 130 is "OK", the processing step proceeds from S502 to S505.

According to the above power reception control, when the power supply device 130 in addition to those that are trusted by the USB-IF, the power feeding device 130 it was confirmed that they comply with the USB standard, than the power P ₁₂ The control for receiving the large electric power P _{22 is performed.} Therefore, according to the above-mentioned power receiving control, it is possible to further improve the safety of power receiving.

● Modified Example of Power Receiving Control FIG. 4B is a flowchart of a modified example of power receiving control according to the first embodiment. In FIG. 4B, the steps in which the same or similar processing as in FIG. 4A is performed are designated by the same reference numerals as those in FIG. 4A. When the control unit 250 detects that the power supply device 130 is connected to the connection unit 210 via the cable 120, the control unit 250 starts the process of this flowchart.

In S421, the PD communication unit 204 transmits / receives information based on the communication protocol of the USB-PD standard, and requests the _{power supply device 130 to supply the electric power P 11.} Here, the electric power P ₁₁ may be the minimum electric power that allows the power receiving device 200 to execute the first authentication process of S405. Further, the electric power P ₁₁ is determined by selecting from the electric power information that can be supplied by the power feeding device 130 received in S402. In the present embodiment, as an example, the electric power P ₁₁ is assumed to be 2.5 W (5 V, 500 mA).

In S422, the power receiving unit 201 controls the electric power P ₁₂ (first electric power) supplied from the power feeding device 130 so as not to exceed the _{electric power P 11 based on the control from the control unit 250. In the present embodiment, the power receiving unit 201 controls the power P 12} (first power) so as not to exceed the _{power P 11} by controlling the current value supplied from the power feeding device 130 to 500 mA or less. Here, the power receiving unit 201 uses the supplied electric power P ₁₂ to supply the electric power required for the power receiving device 200 to execute the first authentication process of S405 to each unit of the power receiving device 200. Further, in order not to run out of power for the first authentication process, the operation of the blocks not involved in the execution of the first authentication process in the power receiving device 200 is restricted so as to reduce the power consumption. May be good. For example, when the power required to execute the first authentication process is 0.5 W and the block not involved in the execution of the first authentication process in the power receiving device 200 does not consume the power, the power receiving unit 201 supplies power. The current value supplied from the device 130 may be controlled to be 100 mA.

In S423, the PD communication unit 204 transmits / receives information based on the communication protocol of the USB-PD standard, and supplies the power P _{31 to the power supply device 130 based on the power information that can be supplied from the power supply device 130.} To request. Here, the electric power P ₃₁ may be the minimum electric power that allows the power receiving device 200 to execute the second authentication process of S407, and may be the electric power _{exceeding the electric power P 11} , but the electric power described later may be used. It is smaller than P _21. Further, the electric power P ₃₁ is determined by selecting from the electric power information that can be supplied by the power feeding device 130 received in S402. In the present embodiment, as an example, the electric power P ₃₁ is assumed to be 15 W (5 V, 3 A).

In S424, the power receiving unit 201 controls the power P ₃₂ (third power) supplied from the power feeding device 130 so as not to exceed the _{power P 31 based on the control from the control unit 250. In the present embodiment, the power receiving unit 201 controls the power P 32} (third power) so as not to exceed the _{power P 31} by controlling the current value supplied from the power feeding device 130 to 3 A or less. The electric power P ₃₂ (third electric power) is larger than the electric _{power P 12} (first electric power) and smaller than the electric _{power P 22 (second electric power).} Here, the power receiving unit 201 uses the supplied electric power P ₃₂ to supply the electric power required for the power receiving device 200 to execute the second authentication process of S407 to each unit of the power receiving device 200. Further, in order not to run out of power for the second authentication process, the operation of the blocks not involved in the execution of the second authentication process in the power receiving device 200 is restricted so as to reduce the power consumption. May be good. For example, when the power required to execute the second authentication process is 5 W and the block not involved in the execution of the second authentication process in the power receiving device 200 does not consume the power, the power receiving unit 201 may use the power receiving device 130. You may control so that the value of the current supplied from is 1A.

The processing of S425 is the same as the processing of S408 except for the transition destination of the processing step according to the determination result. Specifically, if the second authentication process of S407 succeeds, the processing step proceeds to S426, and if the second authentication process fails, the processing step proceeds to S428.

In S426, the PD communication unit 204 transmits / receives information based on the communication protocol of the USB-PD standard, and supplies the power P _{21 to the power supply device 130 based on the power information that can be supplied from the power supply device 130.} To request. Here, the electric power P ₂₁ may be an electric power exceeding the electric _{power P 31.} Further, the electric power P ₂₁ may be the electric power required for the operation of the power receiving device 200. Further, the electric power P ₂₁ is determined by selecting from the electric power information that can be supplied by the power feeding device 130 received in S402. In the present embodiment, as an example, the electric power P ₂₁ is assumed to be 30 W (15 V, 2 A).

In S427, the power receiving unit 201 controls the power P ₂₂ (second power) supplied from the power feeding device 130 so as not to exceed the _{power P 21 based on the control from the control unit 250. In the present embodiment, the power receiving unit 201 controls the power P 22} (second power) so as not to exceed the _{power P 21} by controlling the current value supplied from the power feeding device 130 to 2 A or less. Here, the power receiving unit 201 uses the supplied electric power P ₂₂ to supply necessary electric power to each unit of the power receiving device 200. Incidentally, the power receiving apparatus 200 is switched to release the restriction of the operations performed in S422 and S424, greater power (except that the does not exceed the power P ₂₁₎ the operation setting of each unit of the power receiving apparatus 200 to consume May be good.

If it is determined in S425 that the second authentication process has failed, the process of S428 is executed. In S428, the control unit 250 controls the power receiving unit 201 _{to continue receiving the power P 32} (see S424).

In the example of FIG. 4B, the power receiving unit 201 _{requests the power P 31} and receives the power P ₃₂ (S423 and S424) before the second authentication process (S407) is performed. _{However, the power receiving unit 201 may request the power P 31} and receive the power P ₃₂ (S423 and S424) after the second authentication process (S407) fails.

According to the above-mentioned modification of the power receiving control, the power receiving control can be performed according to the level of safety (reliability) of the power feeding device 130. At the time of S422 (before the execution of the first authentication process), it is unknown whether the power supply device 130 was manufactured by a reliable manufacturer. Further, at the time of S424 (after the success of the first authentication process and before the execution of the second authentication process), it is unknown whether the power supply device 130 conforms to the USB standard, but it is manufactured by a reliable manufacturer. Since it has been confirmed that the power supply device 130 has been used, the power supply device 130 can be trusted to some extent. Furthermore, at the time of S427 (after the success of the first authentication process and the second authentication process), it has been confirmed that the power supply device 130 is manufactured by a reliable manufacturer and conforms to the USB standard. The power feeding device 130 is more reliable than at the time of S424. Therefore, the power receiving device 200 gradually increases the power received in the order of the time point of S422, the time point of S424, and the time point of S427. As a result, even when the power feeding device 130 does not conform to the USB standard, the power receiving device 200 can receive a certain amount of electric power while ensuring safety. As a result, for example, even when the power consumption of the second authentication process _{is larger than the power P 11} (the maximum value of the power P ₁₂ ), the power receiving device 200 receives the power P ₃₂ to receive the second power P 32. It is possible to execute the authentication process.

● Summary of First Embodiment As described above, according to the first embodiment, the power receiving device 200 obtains a certificate including XID from the power feeding device 130 based on the USB-AUTO standard, and the power receiving device 200 obtains a certificate including XID. Determine whether the certificate is authentic (first authentication process). Further, the power receiving device 200 determines whether or not the power feeding device 130 has passed the conformity test of the USB standard based on the XID (second authentication process). If the certificate is determined to be authentic and the power supply device 130 is determined to have passed the conformance test, the power receiving device 200 receives power P ₁₂ (first power) greater than power P 12 (first power) from the power supply device 130. ₂₂ (second power) is controlled to receive power. This makes it possible to further improve the safety of receiving power from the power feeding device 130 by the power receiving device 200.

In the above description, the second authentication process is executed based on the XID of the power supply device 130 and the USB compatibility list 500, but the present embodiment is not limited to the configuration using the USB compatibility list 500. The scope of this embodiment includes any configuration that can determine the pass / fail of the conformance test based on the XID that identifies the power feeding device 130.

[Second Embodiment]
In the second embodiment, the power receiving device 200 acquires the USB compatibility list (second compatibility management information) from the power supply device 130, so that the USB compatibility list (first compatibility) stored in the non-volatile memory 211 is stored. The configuration for updating the management information) will be described. In this embodiment, the basic system configuration is the same as that of the first embodiment (see FIG. 1). Hereinafter, the points different from the first embodiment will be mainly described.

The manufacturer of the power supply device 130 can store the USB compatibility list in the non-volatile memory of the power supply device 130, for example, before shipping the power supply device 130.

FIG. 6 is a flowchart of the USB compatibility list update process according to the second embodiment. When the information update determination unit 213 of the power receiving device 200 determines that the USB compatibility list is updated, the processing of this flowchart starts.

The conditions under which the information update determination unit 213 determines to update the USB compatibility list are not particularly limited. For example, as described in the first embodiment, the information update determination unit 213 updates the USB compatibility list in response to the determination by the control unit 250 that the power supply device 130 and the cable 120 are connected to the connection unit 210. Then judge.

Further, the update process of FIG. 6 is performed on each USB product directly or indirectly connected to the connection unit 210. Hereinafter, the update process for the power feeding device 130 will be described, but the same applies to the update process for the cable 120.

In S601, the information update determination unit 213 makes an inquiry for determining whether or not the power supply device 130 has the USB compatibility list by data communication by the PD communication unit 204. The information update determination unit 213 determines whether or not the power supply device 130 has the USB compatibility list based on the response from the power supply device 130. If the power supply device 130 has the USB compatibility list, the process step proceeds to S602, otherwise the update process of this flowchart ends.

In S602, the information acquisition unit 214 acquires the USB compatibility list from the power supply device 130 by data communication by the PD communication unit 204. The USB compatibility list acquired from the power supply device 130 (hereinafter referred to as "USB compatibility list of the power supply device 130") is a USB compatibility list stored in the non-volatile memory 211 of the power receiving device 200 (hereinafter, "existing USB compatibility list"). It has the same data structure (see FIG. 5A) as the "list"). However, the USB compatibility list of the power supply device 130 does not have to have the information of the expansion area 504.

In the following description, the information set corresponding to one row of the USB compatibility list 500 shown in FIG. 5A is referred to as a "list entry". For example, the USB compatibility list of the power supply device 130 includes a list entry that associates the USB compatibility information "OK" and Version "1.0" with the XID "0x3456_ABCD".

The USB compatibility list of the power supply device 130 may include a plurality of XIDs. In this case, the processing after S603 is executed with each of the plurality of XIDs as the target XID (target identification information). Further, the USB compatibility list of the power supply device 130 may or may not include the XID of the power supply device 130.

In S603, the information updating unit 215 determines whether or not the XID included in the USB compatibility list of the power supply device 130 (hereinafter, referred to as “acquired XID”) exists in the existing USB compatibility list. If the acquired XID exists in the existing USB conformance list, the processing step proceeds to S605, otherwise the processing step proceeds to S604.

In S604, the information update unit 215 adds the list entry corresponding to the acquired XID to the existing USB compatibility list.

In S605, the information update unit 215 determines whether or not the acquired version associated with the XID is newer than the version associated with the same XID existing in the existing USB compatibility list (hereinafter referred to as "current version"). To judge. If the version associated with the acquired XID is newer than the current version, the processing step proceeds to S606. If not, the existing USB compatibility list does not need to be updated, and the update process of this flowchart ends.

The USB compatibility list of the power supply device 130 and the existing USB compatibility list may not include Version (version information). In this case, for example, if it is determined in S603 that the acquired XID exists in the existing USB compatibility list, the update process of this flowchart may be completed.

In S606, the information update unit 215 determines whether or not the information exists in the extension area of the existing USB compatibility list corresponding to the acquired XID. If the information is present in the extended area, the processing step proceeds to S607, otherwise the processing step proceeds to S608.

In S607, the information update unit 215 determines whether or not the information in the expansion area is "NG" (power reception restriction information indicating that power is not received from the USB product). If the information of the extended area is "NG", the update process of this flowchart is finished, and if not, the process step proceeds to S608.

In S608, the information update unit 215 updates the existing USB compatibility list with the list entry corresponding to the acquired XID.

● Summary of Second Embodiment As described above, according to the second embodiment, the power receiving device 200 acquires the USB compatibility list (second compatibility management information) from the power feeding device 130. Then, the power receiving device 200 receives the USB compatibility list (first compatibility management information) stored in the non-volatile memory 211 based on the USB compatibility list (second compatibility management information) acquired from the power supply device 130. To update. This makes it possible to improve the usefulness of the USB compatibility list of the power receiving device 200.

[Third Embodiment]
In the third embodiment, the power receiving device 200 acquires the USB compatibility list (second compatibility management information) from the portable wireless device 300, so that the USB compatibility list (first compatibility) stored in the non-volatile memory 211 is stored. The configuration for updating the sex management information) will be described. In this embodiment, the basic system configuration is the same as that of the first embodiment (see FIG. 1). Hereinafter, the points different from the first embodiment will be mainly described.

● USB compatibility list update process FIG. 7 is a sequence chart of the USB compatibility list update process according to the third embodiment. When the information update determination unit 213 of the power receiving device 200 determines that the USB compatibility list is updated, the processing of this sequence chart starts.

The conditions under which the information update determination unit 213 determines to update the USB compatibility list are not particularly limited. For example, as described in the first embodiment, the information update determination unit 213 determines that the USB compatibility list is updated when a predetermined user input is performed using the operation unit 207.

In S700, the control unit 250 of the power receiving device 200 uses the wireless unit 212 to perform a process of establishing a wireless connection with the portable wireless device 300. Similarly, the control unit 350 of the portable wireless device 300 uses the wireless unit 304 to perform a process of establishing a wireless connection with the power receiving device 200.

The control unit 250 of the power receiving device 200 may start the process of S700 in order to establish a wireless connection with the portable wireless device 300 when the power feeding device 130 is connected to the connection unit 210. Further, the control unit 350 of the portable wireless device 300 starts the process of S700 in order to establish a wireless connection with the power receiving device 200 when the operation of viewing the image of the power receiving device 200 on the portable wireless device 300 is performed. You may. In these cases, the information update determination unit 213 may determine that the USB compatibility list is updated according to the establishment of the wireless connection.

In S701, the control unit 250 of the power receiving device 200 uses the wireless unit 212 to transfer the XID included in the USB compatibility list (USB compatibility list of the power receiving device 200) stored in the non-volatile memory 211 to the portable wireless device 300. Send. The control unit 350 of the portable wireless device 300 uses the wireless unit 304 to receive the XID transmitted from the power receiving device 200.

In S701, the control unit 250 replaces or in addition to the XID included in the USB compatibility list of the power receiving device 200, of a USB product (for example, the power feeding device 130) currently connected to the connecting unit 210. XID may be transmitted. Further, the control unit 250 may transmit the XID of the USB product connected to the connection unit 210 in the past. In order to enable transmission of the XID of the USB product connected to the connection unit 210 in the past, the power receiving device 200 stores the XID of the USB product that has been connected to the connection unit 210. The XID accumulation process will be described later.

In S702, the control unit 350 of the portable wireless device 300 requests the cloud server 150 for the USB conformity information corresponding to the XID received in S701 by using the wireless unit 305.

In S703, the control unit 350 of the portable wireless device 300 receives the USB conformity information requested in S702 from the cloud server 150 by using the wireless unit 305. The USB compatibility information here may be received, for example, by receiving information having the same data structure as the USB compatibility list 500 shown in FIG. 5A.

In S704, the control unit 350 of the portable wireless device 300 creates a USB compatibility list based on the XID received in S701 and the USB compatibility information received in S703, and stores it in the non-volatile memory 303. The USB compatibility list stored in the non-volatile memory 303 (hereinafter, referred to as “USB compatibility list of the portable wireless device 300”) has the same data structure as the USB compatibility list 500 shown in FIG. 5A, for example. If the USB compatibility list of the portable wireless device 300 already exists, the control unit 350 updates the USB compatibility list of the portable wireless device 300 by the same processing as the update process shown in FIG. 6, for example. For this update process, in S703, the control unit 350 may receive version information in addition to the USB compatibility information. Alternatively, since there is a high possibility that the latest USB conformity information is stored in the cloud server 150, the control unit 350 may perform the update process without using the version information. In this case, for example, if it is determined in S603 of FIG. 6 that the acquired XID exists in the existing USB compatibility list, the processing step proceeds to S608.

In S705, the control unit 350 of the portable wireless device 300 uses the wireless unit 304 to transmit the USB compatibility list of the portable wireless device 300 to the power receiving device 200. The control unit 250 of the power receiving device 200 receives the USB compatibility list of the portable wireless device 300 from the portable wireless device 300 by using the wireless unit 212.

In S706, the control unit 250 of the power receiving device 200 updates the USB compatibility list of the power receiving device 200 based on the USB compatibility list of the portable wireless device 300 received in S705. The control unit 250 can update the USB compatibility list of the power receiving device 200 by a process similar to the update process shown in FIG. 6, for example. Further, as in the update process described in S704, the control unit 250 may perform the update process without using the version information.

● XID accumulation process FIG. 8A is a flowchart of the XID accumulation process according to the third embodiment. When the control unit 250 detects that the USB product is connected to the connection unit 210, the control unit 250 starts the process of this flowchart. In the following description, it is assumed that the power feeding device 130 is connected to the connection unit 210.

In S801, the control unit 250 acquires the XID of the power feeding device 130 from the power feeding device 130. Here, it is assumed that the XID "0x5678_ABCD" has been acquired. The method of acquiring the XID is not particularly limited, but for example, the control unit 250 can acquire the XID acquired by the authentication unit 205 in S405 of FIG. 4A by the first authentication process.

In S802, the control unit 250 determines whether or not the XID acquired in S801 is included in the XID list 501 of the USB compatibility list 500 in the non-volatile memory 211. When the acquired XID is included in the XID list 501, the processing of this flowchart ends. If the acquired XID is not included in the XID list 501, the process step proceeds to S803.

In S803, the control unit 250 adds the XID acquired in S801 to the XID list 501. Further, the control unit 250 associates the USB conformity information "Unknown" and the version "0" with the XID.

FIG. 8B is a diagram showing an example of a USB compatibility list including the added XID. Compared to FIG. 5A, a column 851 containing the XID "0x5678_ABCD" is added to FIG. 8 (b).

The control unit 250 can accumulate an XID whose USB compatibility information is unknown by adding the XID to the USB compatibility list each time a new XID is acquired from the USB product connected to the connection unit 210. Then, the control unit 250 can acquire the corresponding USB conformity information by transmitting the accumulated XID to the portable wireless device 300 in the above-mentioned S701.

The storage destination of the XID is not limited to the USB compatibility list. Further, it is not essential to associate the USB conformity information "Unknown" or the like with the stored XID. For example, the control unit 250 may create a new XID list in the non-volatile memory 211 and store a new XID in the new XID list.

● Sharing of the USB compatibility list According to the present embodiment, when the user has a plurality of power receiving devices, the USB compatibility list can be shared among the plurality of power receiving devices via the portable wireless device 300.

FIG. 9 is a diagram illustrating a sharing example of the USB compatibility list. It is assumed that the user has a power receiving device 900 having the same configuration as the power receiving device 200 in addition to the power receiving device 200. The connection unit 910 and the wireless communication medium 960 have the same configurations as the connection unit 210 and the wireless communication medium 360. Further, in addition to the cable 120 and the power feeding device 130, the user shall have a cable 920 and a power feeding device 930 having the same configuration as the cable 120 and the power feeding device 130.

In the situation shown in FIG. 9, when the power receiving device 200 to which the power feeding device 130 is connected executes the update process shown in FIG. 7, in S704, the XID and the USB compatibility information of the power feeding device 130 are the USB of the portable wireless device 300. Stored in the conformance list. After that, when the power receiving device 900 executes the update process shown in FIG. 7, the XID and USB compatibility information of the power feeding device 130 are stored in the USB compatibility list of the power receiving device 900 by the processes of S705 and S706. Similarly, when the power receiving device 900 to which the power feeding device 930 is connected executes the update process shown in FIG. 7, the XID and USB compatibility information of the power feeding device 930 are stored in the USB compatibility list of the portable wireless device 300 in S704. Will be done. After that, when the power receiving device 200 executes the update process shown in FIG. 7, the XID and USB compatibility information of the power feeding device 930 are stored in the USB compatibility list of the power receiving device 200 by the processes of S705 and S706.

In this way, the power receiving devices 200 and 900 can share the USB compatibility list by performing the update process using the portable wireless device 300. Therefore, for example, even if the portable wireless device 300 cannot be used at the timing when the power receiving device 130 is connected to the power receiving device 900 for the first time, if the USB compatibility list is shared in advance, the power receiving device 900 can be used as the power receiving device 130. It is possible to judge the conformity with the standard.

● Summary of Third Embodiment As described above, according to the third embodiment, the power receiving device 200 obtains a USB compatibility list (second compatibility management information) from the portable wireless device 300 (communication device). get. Then, the power receiving device 200 is stored in the non-volatile memory 211 based on the USB compatibility list (second compatibility management information) acquired from the portable wireless device 300, and the USB compatibility list (first compatibility management information) is stored in the non-volatile memory 211. ) Is updated. This makes it possible to improve the usefulness of the USB compatibility list of the power receiving device 200.

Further, according to the third embodiment, the power receiving device 200 acquires the XID of the power feeding device 130 from the power feeding device 130 and stores it in the non-volatile memory 211, and stores the stored XID of the power feeding device 130 in the portable wireless device 300. Send to. Then, the power receiving device 200 receives the USB conformity information associated with the XID of the power feeding device 130 from the portable wireless device 300 and stores it in the non-volatile memory 211. This makes it possible to selectively store the XID and USB compatibility information of the power supply device 130 actually connected to the power receiving device 200 (that is, which is likely to be used in the future) in the USB compatibility list. , The storage area of the non-volatile memory 211 can be effectively used.

[Fourth Embodiment]
In the fourth embodiment, a configuration for displaying information (message) when the first authentication process or the second authentication process fails will be described. In this embodiment, the basic system configuration is the same as that of the first embodiment (see FIG. 1). Hereinafter, the points different from the first embodiment will be mainly described.

FIG. 10 is a flowchart of power receiving control according to the fourth embodiment. In this flowchart, the steps in which the same or similar processing as in FIG. 4A is performed are designated by the same reference numerals as those in FIG. 4A. When the control unit 250 detects that the power supply device 130 is connected to the connection unit 210 via the cable 120, the control unit 250 starts the process of this flowchart. In the following description, it is assumed that the first authentication process and the second authentication process are performed on the power supply device 130, but the first authentication process and the second authentication process are performed on the other USB products. The same applies when it is performed.

The process of S406 in FIG. 10 is the same as that of S406 in FIG. 4A, but the transition destination when the first authentication process fails is different from that of S406 in FIG. 4A. Specifically, if the first authentication process fails, the process step proceeds to S1001. Further, the process of S408 in FIG. 10 is the same as that of S408 in FIG. 4A, but the transition destinations when the second authentication process succeeds and fails are different from those in S408 of FIG. 4A. Specifically, if the second authentication process succeeds, the processing step proceeds to S1004, and if the second authentication process fails, the processing step proceeds to S1002.

In S1001, the control unit 250 performs the first display control for displaying the first information. For example, the control unit 250 displays information on the display unit 208 indicating that the power supply device 130 is not trusted by the USB-IF (the first authentication process has failed). Further, the control unit 250 displays information on the display unit 208 prompting the user to select whether or not _{to supply power (receive power P 22} ) by using the power supply device 130.

11 (a) and 11 (b) are diagrams showing an example of displaying information in S1001. First, the control unit 250 displays information indicating that the power supply device 130 is not trusted by the USB-IF (the first authentication process has failed) as shown in FIG. 11A. To display. After that (for example, after a predetermined time has elapsed), the control unit 250 asks the user whether or not _{to supply power (receive power P 22) using the power supply device 130 as shown in FIG. 11 (b).} The prompting information is displayed on the display unit 208. The information display method in S1001 is not particularly limited, and the control unit 250 includes information corresponding to FIG. 11 (a) and information corresponding to FIG. 11 (b), for example, as shown in FIG. 11 (c). May be displayed together on one screen.

The user can recognize that the first authentication process has failed based on the information displayed in S1001. Then, upon receiving this information, the user can safely supply power by, for example, replacing the power supply device 130 with another power supply device trusted by USB-IF.

When the user selects “yes” or “no” via the operation unit 207 in FIG. 11 (b) or FIG. 11 (c), the processing step proceeds to S1003.

In S1002, the control unit 250 performs a second display control for displaying the second information. For example, the control unit 250 displays information on the display unit 208 indicating that the power supply device 130 has not passed the conformity test of the USB standard (failed in the second authentication process). Further, the control unit 250 displays information on the display unit 208 prompting the user to select whether or not _{to supply power (receive power P 22} ) by using the power supply device 130.

11 (d) and 11 (b) are diagrams showing an example of displaying information in S1002. First, the control unit 250 displays information indicating that the power supply device 130 has not passed the conformity test of the USB standard (failed in the second authentication process) as shown in FIG. 11D. Display at 208. After that (for example, after a predetermined time has elapsed), the control unit 250 asks the user whether or not _{to supply power (receive power P 22) using the power supply device 130 as shown in FIG. 11 (b).} The prompting information is displayed on the display unit 208. The information display method in S1002 is not particularly limited, and the control unit 250 includes information corresponding to FIG. 11 (d) and information corresponding to FIG. 11 (b), for example, as shown in FIG. 11 (e). May be displayed together on one screen.

The user can recognize that the second authentication process has failed based on the information displayed in S1002. Then, in response to this information, the user can safely supply power by, for example, replacing the power supply device 130 with another power supply device that has passed the conformity test. Alternatively, if there is a possibility that the second authentication process has failed because the USB compatibility list is old, the user may operate the power receiving device 200 to update the USB compatibility list.

When the user selects “yes” or “no” via the operation unit 207 in FIG. 11 (b) or FIG. 11 (e), the processing step proceeds to S1003.

By displaying different information in S1001 and S1002 as described above, the user can recognize which of the first authentication process and the second authentication process has failed, and the power can be supplied safely. The coping method of is clarified. However, for example, as shown in FIG. 11 (f), the control unit 250 may display the same information in S1001 and S1002. Even in this case, the user can recognize that at least the first authentication process or the second authentication process has failed.

In S1003, the control unit 250 determines whether or not to _{supply power (receive power P 22).} The control unit 250 determines that power is supplied when the user selects "Yes" in S1001 or S1002, and determines that power is not supplied when the user selects "No" in S1001 or S1002. When power is supplied, the processing step proceeds to S409, otherwise the processing step proceeds to S411.

In this way, the user selects "Yes" according to the information (power supply selection information) displayed in S1001 or S1002 that prompts the user to select whether or not to supply power (power supply is performed). Power can be supplied by performing a user operation of selection). Therefore, even if the first authentication process or the second authentication process fails, for example, when the user knows that the safety of the power supply device 130 is ensured by some method, the user Can choose to supply power. As a result, convenience for the user is improved. Note that the control unit 250 may display information (power supply selection information) prompting the user to select whether or not to supply power only in one of S1001 and S1002.

In S1004, the control unit 250 displays information indicating that both the first authentication process and the second authentication process are successful on the display unit 208.

FIG. 11 (g) is a diagram showing an example of displaying information in S1004. By displaying the information as shown in FIG. 11 (g), the user can clearly recognize that both the first authentication process and the second authentication process have succeeded. However, the processing of S1004 may be omitted. Even in this case, the user can recognize that both the first authentication process and the second authentication process have succeeded because the information of S1001 or S1002 is not displayed.

● Summary of Fourth Embodiment As described above, according to the fourth embodiment, the power receiving device 200 obtains a certificate including XID from the power feeding device 130 based on the USB-AUTO standard, and the power receiving device 200 obtains a certificate including XID. Determine whether the certificate is authentic (first authentication process). Further, the power receiving device 200 determines whether or not the power feeding device 130 has passed the conformity test of the USB standard based on the XID (second authentication process). Then, the power receiving device 200 displays information (message) when the first authentication process or the second authentication process fails. As a result, the user can easily recognize that the first authentication process or the second authentication process has failed.

[Other Embodiments]
The present invention supplies a program that realizes one or more functions of the above-described embodiment to a system or device via a network or storage medium, and one or more processors in the computer of the system or device reads and executes the program. It can also be realized by the processing to be performed. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

The invention is not limited to the above embodiments, and various modifications and modifications can be made without departing from the spirit and scope of the invention. Therefore, a claim is attached to make the scope of the invention public.

120 ... Cable, 130 ... Power supply device, 150 ... Cloud server, 200 ... Power receiving device, 210 ... Connection part, 300 ... Portable wireless device, 360 ... Wireless communication medium, 370 ... Wireless communication medium

Claims (13)

An interface capable of data communication and power reception based on a predetermined power supply standard,
A control means for controlling to receive the first electric power from the power supply device via the interface, and
Based on a predetermined authentication standard, a first determination means for acquiring authentication information including identification information of the power supply device from the power supply device via the interface and determining whether or not the authentication information is genuine. ,
Based on the identification information, a second determination means for determining whether or not the power supply device has passed the conformity test of the predetermined power supply standard, and
With
When the authentication information is determined to be authentic and the power supply device is determined to have passed the conformity test, the control means receives a second electric power larger than the first electric power from the power supply device. A power receiving device characterized in that it is controlled to receive power. Further equipped with a memory for storing conformity management information including one or more identification information,
The second determination means is characterized in that, when the identification information of the power feeding device is included in the conformity management information, it is determined that the power feeding device has passed the conformity test. The power receiving device described. In the conformity management information, each identification information is associated with the conformity information indicating the pass / fail of the conformity test.
The second determination means is the power supply when the identification information of the power supply device is included in the conformity management information and the conformity information associated with the identification information of the power supply device indicates the passing of the conformity test. The power receiving device according to claim 2, wherein the device is determined to have passed the conformity test. Further provided with an association means for associating the power reception restriction information with the specific identification information in the conformity management information.
When the power receiving restriction information is associated with the identification information of the power feeding device in the conformity management information, the second determining means feeds the power regardless of the conformity information associated with the identification information of the power feeding device. The power receiving device according to claim 3, wherein it is determined that the device has not passed the conformity test. The power receiving device according to any one of claims 1 to 4, wherein when it is determined that the authentication information is not genuine, the control means controls to stop receiving power from the power feeding device. .. When it is determined that the authentication information is genuine and the power feeding device has not passed the conformity test, the control means is larger than the first power from the power feeding device and is larger than the second power. The power receiving device according to any one of claims 1 to 5, wherein a third electric power smaller than the electric power is controlled to be received. When it is determined that the authentication information is genuine, the control means is larger than the first power and smaller than the second power from the power supply device before the determination by the second determination means is performed. The power receiving device according to any one of claims 1 to 5, wherein the power receiving device is controlled so as to receive a third electric power. The power receiving device according to any one of claims 1 to 7, wherein the predetermined certification standard is a USB-AUTO standard. The power receiving device according to any one of claims 1 to 8, wherein the interface includes a USB TYPE-C connector. The power receiving device according to any one of claims 1 to 9, wherein the interface is capable of data communication based on a USB standard. The power receiving device according to any one of claims 1 to 10, wherein the identification information is a USB standard XID. It is a control method of a power receiving device having an interface capable of receiving data based on data communication and a predetermined power supply standard.
A control step of controlling to receive the first electric power from the power feeding device via the interface, and
Based on the predetermined authentication standard, the first determination step of acquiring the authentication information including the identification information of the power supply device from the power supply device via the interface and determining whether or not the authentication information is genuine. ,
Based on the identification information, a second determination step of determining whether or not the power supply device has passed the conformity test of the predetermined power supply standard, and
With
When it is determined that the authentication information is genuine and the power supply device has passed the conformity test, in the control step, a second power source larger than the first power source is supplied from the power supply device. A control method characterized by controlling to receive power. A program for causing a computer to function as each means of the power receiving device according to any one of claims 1 to 11.

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