JP2010104097A - Authentication processing apparatus, power transmitter, power receiver and electronic apparatus - Google Patents

Abstract

An authentication processing device and the like that enable highly secure authentication processing in a non-contact power transmission system.
An authentication processing device 200 provided in a power transmission device 10 of a contactless power transmission system includes a processing unit 210 that performs authentication processing. The processing unit 210 creates a challenge data creation unit 220 that creates challenge data for authenticating the power receiving device 40, and a process for transmitting the created challenge data to the power receiving device 40 by inter-coil communication of non-contact power transmission. Transmission processing unit 230 that performs authentication, verification data creation unit 240 that performs verification calculation, and response data that is generated when the power-receiving side performs authentication calculation on challenge data. An authentication unit 250 that authenticates the power receiving device 40 by a verification process using verification data when received from the power receiving device 40 by inter-coil communication for power transmission.
[Selection] Figure 4

Description

  The present invention relates to an authentication processing device, a power transmission device, a power reception device, an electronic device, and the like.

  In recent years, contactless power transmission (contactless power transmission) that uses electromagnetic induction and enables power transmission even without a metal part contact has been highlighted. Charging of telephones and household equipment (for example, a handset of a telephone) has been proposed.

  There exists patent document 1 as a prior art of such non-contact electric power transmission. In Patent Document 1, ID authentication is realized by transmitting and receiving an authentication code between a power transmission side (primary side) and a power reception side (secondary side), and insertion of a foreign object or the like is detected.

However, in the prior art of Patent Document 1, the power transmission side transmits an authentication code to the power reception side, and the power reception side only performs a match determination of the received authentication code. Therefore, although foreign substances can be effectively identified, unauthorized devices cannot be identified, and there is a possibility that problems such as production of counterfeit products may occur.
JP 2006-60909 A

  According to some aspects of the present invention, it is possible to provide an authentication processing device, a power transmission device, a power reception device, an electronic device, and the like that enable authentication processing with high security in a contactless power transmission system.

  One embodiment of the present invention electromagnetically couples a primary coil of a power transmission device and a secondary coil of a power reception device to transmit power from the power transmission device to the power reception device, and to a load of the power reception device. An authentication processing device provided in the power transmission device of a non-contact power transmission system that supplies power, including a processing unit that performs authentication processing, and the processing unit creates challenge data for authenticating the power receiving device A verification data is created by performing a challenge data creation unit, a transmission processing unit that performs processing for transmitting the created challenge data to the power receiving device by inter-coil communication of contactless power transmission, and an authentication calculation. The response data created by the verification data creation unit that performs the authentication calculation on the challenge data by the challenge data is forwarded by inter-coil communication for contactless power transmission. When received from the power receiving device, the verification processing using the verification data, related to the authentication processing apparatus including an authentication unit for authenticating the receiving device.

  According to one aspect of the present invention, challenge data is created and transmitted to the power receiving side. In addition, verification data is created by performing an authentication calculation. On the other hand, the power receiving side creates response data by performing an authentication calculation on the challenge data and transmits it to the power transmitting side. Then, the power transmission side that has received the response data authenticates the power receiving apparatus by performing verification processing using the verification data. For example, the power receiving apparatus is authenticated by performing a process of matching the response data and the matching data, or a process of matching the challenge data and the matching data (for example, the matching data created from the response data). In this way, since it is authenticated whether or not appropriate response data is returned to the challenge data, an unauthorized power receiving device or the like can be eliminated. In addition, since response data is created by performing an authentication operation, it is possible to prevent, for example, data from being eavesdropped and performing unauthorized authentication, realizing highly secure authentication processing in a contactless power transmission system it can.

  In the aspect of the invention, the verification data creation unit creates the verification data using the challenge data and power transmission side key information, and the authentication unit uses the challenge data and power reception side key information. When the created response data is received from the power receiving device, the received power device may be authenticated by comparing the received response data with the verification data.

  In this way, the verification data created using the power transmission side key information and the response data created using the power reception side key information are collated, and the power receiving apparatus is authenticated, so the security is higher. Authentication processing can be realized.

  Moreover, in one aspect of the present invention, when the verification data creation unit receives the response data created using the challenge data and the power receiving side key information from the power receiving device, the received response data and The verification data may be created using power transmission side key information, and the authentication unit may verify the power receiving device by verifying the challenge data and the verification data.

  In this way, when the response data created using the challenge data and the power receiving side key information is received, the verification data created using the response data and the power transmitting side key information are collated with the challenge data. Thus, authentication of the power receiving apparatus is performed, so that authentication processing with higher security can be realized.

  In one aspect of the present invention, the processing unit may perform an authentication process using challenge data and response data in a temporary power transmission period before starting normal power transmission.

  As described above, when the authentication process using the challenge data and the response data is performed in the temporary power transmission period before the start of normal power transmission, it is possible to prevent a situation in which contactless power transmission is performed on an unauthorized device.

  In one embodiment of the present invention, the temporary power transmission period may be a power transmission period for information communication between the power transmission side and the power reception side before the start of normal power transmission.

  In one aspect of the present invention, the processing unit may perform periodic authentication processing in a periodic authentication period after the start of normal power transmission.

  In this way, even when switching to an unauthorized device is performed after the start of normal power transmission, this can be dealt with.

  Moreover, in one aspect of the present invention, the verification data generation unit generates periodic authentication verification data by performing a periodic authentication calculation, and the authentication unit is connected to the power receiving device by inter-coil communication of non-contact power transmission. When the periodic authentication data is received, the received periodic authentication data may be collated with the periodic authentication verification data to perform periodic authentication of the power receiving apparatus.

  In this way, the power receiving apparatus can be periodically authenticated in the periodic authentication period after normal power transmission.

  Moreover, in one aspect of the present invention, the verification data creation unit may create the periodic authentication verification data using data used for the authentication process before the start of normal power transmission.

  In this way, high-security periodic authentication can be realized without using a challenge / response method or the like.

  In one aspect of the present invention, the processing unit includes a periodic authentication data creating unit that creates periodic authentication data for the power receiving device to periodically authenticate the power transmitting device, and the transmission processing unit You may perform the process for transmitting periodical authentication data to the said power receiving apparatus by the communication between coils of non-contact electric power transmission.

  If it does in this way, it will become possible to authenticate a power transmission apparatus regularly in the periodical authentication period after normal power transmission.

  In one aspect of the present invention, the periodic authentication data creating unit may generate periodic authentication data having a value different from that of the periodic authentication data transmitted in the i-th periodic authentication period in the (i + 1) -th periodic authentication period (i is a natural number). May be created.

  In this way, it is possible to prevent a situation in which the periodic authentication data is wiretapped and unauthorized authentication is performed.

  In one aspect of the present invention, the processing unit may perform a periodic authentication process using challenge data and response data in a periodic authentication period after the start of normal power transmission.

  In this way, periodic authentication with high security can be realized.

  Moreover, in one mode of the present invention, the power transmission control device includes an interface unit for communicating with a host interface included in the power transmission control device provided in the power transmission device, and the power transmission control device controls communication between coils for power transmission control and contactless power transmission. The processing unit may perform processing for communicating challenge data and response data with the power transmission control device via the interface unit.

  In this way, for example, just by connecting the authentication processing device to the bus of the host interface, the host interface is effectively used, and the challenge data and response data are communicated with the power transmission control device, thereby realizing the authentication processing. it can.

  According to another aspect of the present invention, the authentication processing device described above, a power transmission control device that controls inter-coil communication for power transmission control and contactless power transmission, and an AC voltage are generated and supplied to the primary coil. And a power transmission device including the power transmission unit.

  Moreover, the other aspect of this invention is related with the electronic device containing the power transmission apparatus as described above.

  In another aspect of the present invention, the primary coil of the power transmission device and the secondary coil of the power reception device are electromagnetically coupled to transmit power from the power transmission device to the power reception device, and to the load of the power reception device. An authentication processing device provided in the power receiving device of the non-contact power transmission system that supplies power to the power receiving system, including a processing unit that performs authentication processing, wherein the processing unit receives challenge data for authenticating the power receiving device A response data creation unit that, when received from the power transmission device by non-contact power transmission inter-coil communication, performs a computation for authentication on the received challenge data and creates response data, and the created response The present invention relates to an authentication processing device including a transmission processing unit that performs processing for transmitting data to the power transmission device by inter-coil communication of contactless power transmission.

  According to another aspect of the present invention, when challenge data is received, response data is created by performing an authentication calculation on the received challenge data, and the created response data is transmitted to the power transmission device. In this way, since it is possible to authenticate whether or not appropriate response data is returned to the challenge data on the power transmission side, it is possible to deal with an unauthorized power receiving apparatus or the like. Moreover, since response data is created by performing an authentication calculation, it is possible to prevent a situation where data is eavesdropped and unauthorized authentication is performed, and a highly secure authentication process can be realized in a contactless power transmission system. .

  In another aspect of the present invention, the processing unit may perform an authentication process using challenge data and response data in a temporary power transmission period before starting normal power transmission.

  Thus, if the authentication process using the challenge data and the response data is performed in the temporary power transmission period, it is possible to prevent a situation in which contactless power transmission is performed on an unauthorized device.

  In the aspect of the invention, the temporary power transmission period may be a power transmission period for information communication between the power transmission side and the power reception side before the start of normal power transmission.

  In another aspect of the present invention, the processing unit may perform periodic authentication processing in a periodic authentication period after starting normal power transmission.

  In this way, it is possible to cope with a case where an unauthorized device is replaced after the start of normal power transmission.

  In another aspect of the present invention, the processing unit includes a periodic authentication data creating unit that creates periodic authentication data for the power transmission device to periodically authenticate the power receiving device, and the transmission processing unit is created You may perform the process for transmitting the said regular authentication data to the said power transmission apparatus by the communication between coils of non-contact electric power transmission.

  In this way, it becomes possible to periodically authenticate the power receiving apparatus in the periodic authentication period after normal power transmission.

  In another aspect of the present invention, the periodic authentication data creating unit may perform periodic authentication with a value different from the periodic authentication data transmitted in the i-th periodic authentication period in the (i + 1) -th periodic authentication period (i is a natural number). Data may be created.

  In this way, it is possible to prevent a situation in which the periodic authentication data is wiretapped and unauthorized authentication is performed.

  In another aspect of the present invention, the periodic authentication data creation unit may create the periodic authentication data using data used for authentication processing before starting normal power transmission.

  In this way, high-security periodic authentication can be realized without using a challenge / response method or the like.

  According to another aspect of the present invention, the processing unit includes a verification data generation unit that generates verification data for periodic authentication by performing periodic authentication computation, and the authentication unit communicates between coils of contactless power transmission. When the periodic authentication data is received from the power transmission device, the received periodic authentication data and the periodic authentication verification data may be collated to perform periodic authentication of the power transmission device.

  In this way, the power transmission device can be periodically authenticated in the periodic authentication period after normal power transmission.

  In another aspect of the present invention, the verification data creation unit may create the periodic authentication verification data using data used for the authentication process before starting normal power transmission.

  In this way, high-security periodic authentication can be realized without using a challenge / response method or the like.

  In another aspect of the present invention, the power reception control device includes an interface unit for communicating with a host interface included in the power reception control device, and the power reception control device performs communication between coils for power reception control and contactless power transmission. Control may be performed, and the processing unit may perform processing for communicating challenge data and response data with the power reception control device via the interface unit.

  In this way, for example, just by connecting the authentication processing device to the bus of the host interface, the host interface is effectively used to communicate authentication data and response data with the power reception control device, thereby realizing authentication processing. it can.

  According to another aspect of the present invention, the authentication processing device according to any one of the above, a power reception control device that performs control of inter-coil communication for power reception control and non-contact power transmission, and an induced voltage of the secondary coil as a direct current. The present invention relates to a power receiving device including a power receiving unit that converts voltage.

  Another aspect of the invention relates to an electronic device including the power receiving device described above and a load to which power is supplied by the power receiving device.

  Hereinafter, preferred embodiments of the present invention will be described in detail. The present embodiment described below does not unduly limit the contents of the present invention described in the claims, and all the configurations described in the present embodiment are indispensable as means for solving the present invention. Not necessarily.

1. Electronic Device FIG. 1A shows an example of an electronic device to which the contactless power transmission method of this embodiment is applied. A charger 500 (cradle) which is one of electronic devices has a power transmission device 10. A mobile phone 510 that is one of the electronic devices includes a power receiving device 40. The mobile phone 510 includes a display unit 512 such as an LCD, an operation unit 514 including buttons and the like, a microphone 516 (sound input unit), a speaker 518 (sound output unit), and an antenna 520.

  Electric power is supplied to the charger 500 via the AC adapter 502, and this electric power is transmitted from the power transmitting device 10 to the power receiving device 40 by contactless power transmission. Thereby, the battery of the mobile phone 510 can be charged or the device in the mobile phone 510 can be operated.

  Note that the electronic apparatus to which this embodiment is applied is not limited to the mobile phone 510. For example, the present invention can be applied to various electronic devices such as wristwatches, cordless telephones, shavers, electric toothbrushes, wrist computers, handy terminals, portable information terminals, electric bicycles, and IC cards.

  As schematically shown in FIG. 1B, power transmission from the power transmission device 10 to the power reception device 40 is performed on the primary coil L1 (power transmission coil) provided on the power transmission device 10 side and on the power reception device 40 side. This is realized by electromagnetically coupling the secondary coil L2 (power receiving coil) formed to form a power transmission transformer. Thereby, non-contact power transmission becomes possible.

  In FIG. 1B, the primary coil L1 and the secondary coil L2 are, for example, air-core planar coils formed by winding a coil wire spirally on a plane. However, the coil of the present embodiment is not limited to this, and any shape, structure, or the like may be used as long as the primary coil L1 and the secondary coil L2 can be electromagnetically coupled to transmit power.

  For example, in FIG. 1C, the primary coil L1 is formed by winding a coil wire around the X-axis around the magnetic core in a spiral shape. The same applies to the secondary coil L2 provided in the mobile phone 510. In this embodiment, the present invention can also be applied to a coil as shown in FIG. In the case of FIG. 1 (C), as the primary coil L1 and the secondary coil L2, in addition to the coil wound around the X axis, a coil wound around the Y axis may be combined. .

2. Configuration FIG. 2 shows a configuration example of the authentication processing devices 200 and 300, the power transmission device 10, the power reception device 40, and the like according to this embodiment. 2, the primary coil L1 and the secondary coil L2 are electromagnetically coupled to transmit power from the power transmitting apparatus 10 to the power receiving apparatus 40 and to supply power to the load 90. (Non-contact power transmission) system is realized.

  The power transmission device 10 (power transmission module, primary module) includes a primary coil L1, a power transmission unit 12, a power transmission control device 20, and an authentication processing device 200. It should be noted that modifications can be made such as omitting some of these components or adding other components.

  The primary coil L1 (power transmission side coil) is electromagnetically coupled to the secondary coil L2 (power reception side coil) to form a power transmission transformer. The power transmission unit 12 generates an AC voltage having a predetermined frequency during power transmission, and generates an AC voltage having a different frequency according to data during data transfer, and supplies the AC voltage to the primary coil L1. The power transmission unit 12 includes at least a first power transmission driver that drives one end of the primary coil L1, a second power transmission driver that drives the other end of the primary coil L1, and a resonance circuit together with the primary coil L1. One capacitor can be included.

  In FIG. 2, data communication from the power transmission side to the power reception side is realized by frequency modulation, and data communication from the power reception side to the power transmission side is realized by load modulation.

  Specifically, as illustrated in FIG. 3A, for example, when the data “1” is transmitted to the power receiving side, the power transmission unit 12 generates an alternating voltage of the frequency f1 and stores the data “0”. In the case of transmission, an AC voltage having a frequency f2 is generated. The detection circuit 59 on the power receiving side detects the change in the frequency, thereby discriminating data “1” and “0”. Thereby, data communication by frequency modulation from the power transmission side to the power reception side is realized.

  On the other hand, the load modulation unit 46 on the power receiving side variably changes the load on the power receiving side according to the data to be transmitted, and changes the signal waveform of the induced voltage of the primary coil L1 as shown in FIG. . For example, when data “1” is transmitted to the power transmission side, the power reception side is set to a high load state, and when data “0” is transmitted, the power reception side is set to a low load state. Then, the load state detection circuit 30 on the power transmission side detects data “1” and “0” by detecting the change in the load state on the power reception side. Thereby, data communication by load modulation from the power receiving side to the power transmission side is realized.

  In FIGS. 3A and 3B, data communication from the power transmission side to the power reception side is realized by frequency modulation, and data communication from the power reception side to the power transmission side is realized by load modulation. Alternatively, other modulation schemes or other schemes may be employed.

  The power transmission control device 20 is a device that performs various controls of the power transmission device 10, and can be realized by an integrated circuit device (IC), a microcomputer, or the like. The power transmission control device 20 includes a control unit 22 and a load state detection circuit 30.

  The control unit 22 (power transmission side) controls the power transmission control device 20 and the power transmission device 10. The power transmission sequence control unit 100 performs sequence control for power transmission (normal power transmission, temporary power transmission) of contactless power transmission. The transmission control unit 102 controls processing for transmitting data to the power receiving side, for example, by frequency modulation. The reception control unit 104 controls processing for receiving data from the power receiving side, for example, by load demodulation. When the load state detection circuit 30 detects the load state on the power receiving side, the detection determination unit 106 performs detection determination such as data detection, foreign object detection, and removal detection based on the detection information. The periodic authentication determination unit 108 performs a determination process as to whether or not appropriate periodic authentication has been performed, for example, when the power receiving side performs periodic authentication after the start of normal power transmission.

  The load state detection circuit 30 (waveform detection circuit) detects the load state on the power receiving side (power receiving device or foreign object). This detection of the load state can be realized by detecting the waveform change of the induced voltage signal (coil end signal) of the primary coil L1. For example, when the load state (load current) on the power receiving side (secondary side) changes, the waveform of the induced voltage signal changes. The load state detection circuit 30 detects such a change in waveform and outputs a detection result (detection result information) to the control unit 22. The control unit 22 determines the load state (load fluctuation, load level) on the power receiving side (secondary side) based on the load state detection information in the load state detection circuit 30.

  The power reception device 40 (power reception module, secondary module) includes a secondary coil L2, a power reception unit 42, a load modulation unit 46, a power supply control unit 48, a power reception control device 50, and an authentication processing device 300. Note that it is possible to perform modifications such as omitting some of these components (for example, load modulation unit) or adding other components.

  The power receiving unit 42 converts the AC induced voltage of the secondary coil L2 into a DC voltage. This conversion can be realized by a rectifier circuit included in the power receiving unit 42.

  The load modulation unit 46 performs load modulation processing. Specifically, when data is transmitted from the power receiving side to the power transmitting side, the load at the load modulation unit 46 (secondary side) is variably changed according to the data to be transmitted, as shown in FIG. The signal waveform of the induced voltage of the primary coil L1 is changed.

  The power supply control unit 48 controls power supply to the load 90. That is, the power supply to the load 90 is turned on or off. Specifically, the level of the DC voltage from the power receiving unit 42 (rectifier circuit) is adjusted, a power supply voltage is generated, supplied to the load 90, and the battery 94 of the load 90 is charged. Note that the load 90 may not include the battery 94.

  The power reception control device 50 is a device that performs various controls of the power reception device 40 and can be realized by an integrated circuit device (IC), a microcomputer, or the like. The power reception control device 50 can operate with a power supply voltage generated from the induced voltage of the secondary coil L2. The power reception control device 50 includes a control unit 52 and a detection circuit 59.

  The control unit 52 (power reception side) controls the power reception control device 50 and the power reception device 40. The power reception sequence control unit 120 performs sequence control for power reception of contactless power transmission. The transmission control unit 122 controls processing for transmitting data to the power transmission side, for example, by load modulation. The reception control unit 124 controls processing for receiving data from the power transmission side, for example, by frequency demodulation. When the detection circuit 59 performs position detection or frequency detection, the detection determination unit 126 performs detection determination based on the detection information. The periodic authentication control unit 128 controls periodic authentication performed after the start of normal power transmission. For example, in order to detect a take-up state due to a so-called foreign object, the load state on the power receiving side is changed periodically (intermittently) after the start of normal power transmission.

  The authentication processing devices (authentication processing circuits) 200 and 300 perform authentication processing and can be realized by an integrated circuit device (IC) or a microcomputer. The authentication processing device 200 and the power transmission control device 20 may be realized by a one-chip IC, or the authentication processing device 300 and the power reception control device 50 may be realized by a one-chip IC.

  The power transmission side authentication processing device 200 includes a processing unit 210, a storage unit 280, and an I / F (interface) unit 290. The power receiving side authentication processing device 300 includes a processing unit 310, a storage unit 380, and an I / F unit 390. including. The processing units 210 and 310 perform various authentication processes. The storage units 280 and 380 store key information and the like, and can be realized by, for example, a nonvolatile memory such as an EEPROM or a RAM. The I / F units 290 and 390 perform communication processing with external devices such as the power transmission control device 20 and the power reception control device 50.

  The processing unit 210 on the power transmission side includes a challenge data creation unit 220, a transmission processing unit 230, a verification data creation unit 240, and an authentication unit 250.

  The challenge data creation unit 220 creates challenge data for authenticating the power receiving device 40. That is, challenge data for challenge / response authentication is created. As this challenge data, for example, a random number can be used. In this way, the challenge data sent from the power transmission side to the power reception side changes randomly, and the response data corresponding to the challenge data also changes randomly. Can reduce the risk of being done.

  The transmission processing unit 230 performs processing for transmitting the created challenge data to the power receiving device 40 by inter-coil communication for contactless power transmission. Specifically, the challenge data is transmitted to the power transmission control device 20, and the transmission data control device 20 is requested to transmit the challenge data. The inter-coil communication can be realized, for example, by information communication using a primary coil and a secondary coil that are coils for power transmission. However, a coil for information communication (for example, RF-ID etc.) different from the coil for power transmission may be provided to realize inter-coil communication.

  The verification data creation unit 240 performs verification computation to create verification data (response data on the authentication host side). For example, a verification operation is performed on the challenge data to create verification data. In other words, the same authentication calculation (authentication host side calculation) as the power reception side authentication calculation (authentication client side calculation) is performed, and the same value as the response data (authentication client side response data) generated on the power receiving side is obtained. Create collation data. As this authentication operation, an operation using a special function (calculation method) such as a one-way function (hash function) can be adopted.

  The authentication unit 250 authenticates the power receiving device 40. Specifically, when response data created by the power receiving side (authentication processing device 300) performing an authentication operation on the challenge data is received from the power receiving device 40 by inter-coil communication for contactless power transmission or the like. Then, verification processing using the verification data is performed to authenticate the power receiving device (power reception control device) 40. For example, the power receiving apparatus 40 is authenticated by performing a process of collating response data and collation data, or performing a process of collating challenge data and collation data obtained from the response data.

  For example, the collation data creation unit 240 creates collation data using the challenge data and the power transmission side key information stored in the storage unit 280. Then, when the authentication unit 250 receives response data created by the power receiving side using the challenge data and the power receiving side key information from the power receiving device 40, the authentication unit 250 compares the received response data with the verification data, and determines the power receiving device 40. Certify.

  Alternatively, when the response data created using the power receiving side key information and the challenge data stored in the storage unit 380 is received from the power receiving device 40, the verification data creating unit 240 receives the received response data and the power transmitting side key. Create verification data using information. Then, the authentication unit 250 verifies the challenge data and the verification data to authenticate the power receiving device 40.

  In addition, the authentication process using such challenge data and response data is a temporary power transmission for information communication and positional relationship confirmation between the power transmission side (power transmission device) and the power reception side (power reception device) before starting normal power transmission. It is desirable to perform in the period. By doing in this way, the situation where the normal power transmission of non-contact power transmission is performed between unauthorized devices can be prevented.

  Further, as will be described later, when performing periodic authentication after the start of normal power transmission, periodic authentication processing may be performed in the periodic authentication period (periodic authentication period during the normal power transmission period).

  For example, as shown in FIG. 6A described later, a periodic authentication data creation unit 324 is provided in the power receiving side processing unit 310. The periodic authentication data creation unit 324 creates periodic authentication data that is data for the power transmission device 10 to periodically authenticate the power receiving device 40.

  Specifically, the periodic authentication data is created using the data used for the authentication process before starting normal power transmission. For example, regular authentication data using challenge data, response data, challenge data or data obtained by performing a predetermined calculation on the authentication process before starting normal power transmission, or data obtained in the middle of the authentication process. Create In this way, it is possible to realize a periodic authentication process with high security without using a challenge / response method or the like.

  And the transmission process part 330 performs the process for transmitting the produced regular authentication data to the power transmission apparatus 10 by the communication between coils of non-contact electric power transmission. In this case, the periodic authentication data creating unit 324 creates periodic authentication data having a value different from the periodic authentication data transmitted in the i-th periodic authentication period in the i + 1 (i is a natural number) periodic authentication period. To do. In this way, it is possible to prevent a situation in which the periodic authentication data is intercepted by a third party and unauthorized authentication is performed. Then, the collation data creation unit 240 on the power transmission side creates regular authentication collation data by performing a regular authentication calculation. For example, regular authentication verification data is created using data (challenge data, response data, intermediate result data, etc.) used for authentication processing before starting normal power transmission. The power transmission-side authentication unit 250 collates the received periodic authentication data with the created periodic authentication period verification data, thereby performing periodic authentication of the power receiving device 40.

  Note that the periodic authentication process using the challenge data and the response data may also be performed in the periodic authentication period after the start of normal power transmission. That is, authentication is performed by the challenge-response method not only before the start of normal power transmission but also during the periodic authentication period.

  In addition, as shown in FIG. 6B described later, the periodic authentication data may be transmitted from the power transmission device 10 to the power reception device 40. Specifically, the verification data creation unit 340 on the power receiving side creates periodic authentication verification data by performing periodic authentication calculations. For example, the verification data creation unit 340 creates regular verification verification data using data (challenge data, response data, intermediate result data, etc.) used for the authentication process before the start of normal power transmission. Then, when the authentication unit 350 receives the periodic authentication data from the power transmission device 10 through the inter-coil communication for contactless power transmission, the authentication unit 350 compares the received periodic authentication data with the periodic authentication verification data, Authenticate.

  Further, as shown in FIG. 7A described later, a response data creation unit 222 may be provided in the processing unit 210 on the power transmission side. In this case, when challenge data for power transmission side authentication for authenticating the power transmission device 10 is received from the power reception device 40 by inter-coil communication for contactless power transmission, the response data creation unit 222 receives the received power transmission side authentication. The authentication calculation is performed on the challenge data for generating the response data for power transmission side authentication. And the transmission process part 230 performs the process for transmitting the created response data for power transmission side authentication to the power receiving apparatus 40 by the communication between coils of non-contact power transmission. By doing so, the power receiving side can also authenticate the power transmission side.

  The power receiving side processing unit 310 includes a response data creation unit 322 and a transmission processing unit 330. When the response data creation unit 322 receives challenge data for authenticating the power receiving device 40 from the power transmission device 10 by inter-coil communication for non-contact power transmission, the response data creation unit 322 performs authentication computation (authentication client side) on the received challenge data. To calculate response data. This authentication calculation is, for example, the same calculation as the authentication calculation performed by the collation data creation unit 240 on the power transmission side (authentication host side).

  And the transmission process part 330 performs the process for transmitting the produced response data to the power transmission apparatus 10 by the communication between coils of non-contact electric power transmission. By doing so, the power transmitting-side authentication unit 250 can authenticate the power receiving device 40 by comparing the response data received from the power receiving side with the verification data.

  The processing unit 210 on the power transmission side performs an authentication process using challenge data and response data in the temporary power transmission period before the start of normal power transmission. Then, regular authentication processing is performed in the regular authentication period after the start of normal power transmission.

  Further, as shown in FIG. 7A described later, a challenge data creation unit 320, a collation data creation unit 340, and an authentication unit 350 may be provided in the processing unit 310 on the power receiving side.

  In this case, the challenge data creation unit 320 creates challenge data for power transmission side authentication for authenticating the power transmission device 10. Moreover, the collation data creation part 340 performs the calculation for authentication, and produces the collation data for power transmission side authentication. For example, authentication computation is performed on challenge data for power transmission side authentication, and verification data for power transmission side authentication is created. And the transmission process part 330 performs the process for transmitting the created challenge data for power transmission side authentication to the power transmission apparatus 10 by the communication between coils of non-contact power transmission.

  Then, the authentication unit 350 transmits the response data for power transmission side authentication created by the power transmission side performing authentication calculation for the challenge data for power transmission side authentication from the power transmission device 10 by inter-coil communication of non-contact power transmission. Upon reception, authentication of the power transmission device (power transmission control device) 10 is executed by verification processing using verification data for power transmission side authentication. For example, the received response data for power transmission side authentication and verification data for power transmission side authentication are collated to perform authentication of the power transmission device 10. Alternatively, verification of the power transmission device 10 may be executed by comparing verification data for power transmission side authentication obtained from response data for power transmission side authentication with challenge data for power transmission side authentication.

  In this case, it is desirable that the transmission processing unit 330 performs a process for transmitting the power-receiving-side authentication challenge data together with the power-receiving-side authentication response data to the power transmission device 10 by inter-coil communication for contactless power transmission. . If it does in this way, it will become possible to transmit the response data for power receiving side authentication, and the challenge data for power transmission side authentication to the power transmission apparatus 10 by one transfer, and the efficiency of authentication processing can be achieved.

3. Operation Next, the operation of the present embodiment will be described with reference to FIGS. 4 (A) to 7 (B). 4A to 4C are explanatory diagrams of the basic operation of the authentication process according to the present embodiment.

  As shown in FIG. 4A, when the power transmission device 10 and the power reception device 40 approach each other and contactless power transmission (for example, temporary power transmission) from the power transmission device 10 to the power reception device 40 starts, the power reception control device 50 (secondary side) Controller) powers on and starts up.

  The power transmission control device 20 confirms the authentication status of the authentication processing device 200. If the authentication is possible, the power transmission control device 20 proceeds with the subsequent processing. Then, when authentication is possible, the power transmission control device 20 requests the power transmission side authentication processing device 200 to create challenge data. Thereby, the challenge data creation unit 220 of the authentication processing device 200 creates challenge data based on a random number or the like and transmits the challenge data to the power transmission control device 20. Then, the power transmission control device 20 transmits the received challenge data to the power receiving device 40 through, for example, a non-contact power transmission path. Specifically, for example, transmission is performed by the frequency modulation described with reference to FIG.

  When receiving the challenge data from the power transmission device 10, the power reception control device 50 transfers the challenge data to the authentication processing device 300 on the power reception side and instructs the start of calculation. Then, as shown in FIG. 4B, the response data creation unit 322 of the authentication processing device 300 creates response data. Specifically, response data is created by performing an authentication calculation using a one-way function or the like on the challenge data.

  When the authentication calculation ends, the power reception control device 50 receives response data from the authentication processing device 300. Then, the received response data is transmitted to the power transmission device 10 through, for example, a contactless power transmission path. Specifically, for example, transmission is performed by the load modulation described with reference to FIG. At this time, the collation data creation unit 240 on the power transmission side creates collation data that is data for collation with the response data. Then, as illustrated in FIG. 4C, the authentication unit 250 performs authentication processing of the power receiving device 40 by comparing the received response data with the verification data.

  According to the authentication method of the present embodiment described above, since it is authenticated whether or not appropriate response data is returned with respect to the challenge data, it is possible to eliminate an improperly imitated power receiving device or the like. In addition, security can be strengthened by using different values of data such as random numbers as change data. Furthermore, since the response data is created by performing a predetermined authentication calculation, it is possible to prevent a situation where the data is tapped and unauthorized authentication is performed.

  For example, as a comparative example of the present embodiment, there is a method in which an authentication code is transmitted from one side of the power transmission device or the power reception device to the other side, and the other side determines whether or not the received authentication code matches a predetermined code. Conceivable. However, in this method, if the authentication code is wiretapped and leaked, even an unauthorized device can establish authentication, which may cause problems due to counterfeits.

  In this regard, according to the authentication method of the present embodiment, the challenge data becomes data with a different value each time, and the response data is created by a one-way function or the like, so that the above problem can be prevented.

  Next, detailed operation of the present embodiment will be described with reference to FIGS. 5 (A) to 7 (B).

  In FIG. 5A, temporary power transmission from the power transmission device 10 to the power reception device 40 is performed before the start of normal power transmission. This temporary power transmission (temporary power transmission period) includes information communication (ID authentication) between the power transmission side (power transmission device) and the power reception side (power reception device) before the start of normal power transmission, and the primary coil L1 and the secondary coil L2. This is power transmission (power transmission period) for confirming the positional relationship. For example, temporary power transmission with lower power than normal power transmission is executed, and various information that needs to be transferred before normal power transmission is communicated from the power receiving side to the power transmission side or from the power transmission side to the power receiving side during the temporary power transmission period. Or whether the positional relationship between the primary coil L1 and the secondary coil L2 is correct (whether the positional relationship is as shown in FIG. 1B).

  In FIG. 5B, in this temporary power transmission period, the power transmission side transmits challenge data to the power reception side, and the power reception side returns response data to the power transmission side to execute authentication of the power reception device 40. When the authentication of the power receiving device 40 is successful, normal power transmission is started as shown in FIG. 5C, and power supply to a load using contactless power transmission is started. As described above, by performing challenge-response authentication in the temporary power transmission period, it is possible to prevent a situation where normal power transmission is performed to the unauthorized power receiving device 40.

  In this embodiment, after normal power transmission is started in this way, for example, periodic authentication as described later is performed. In FIG. 6A, in this periodic authentication period, the periodic authentication data creation unit 324 on the power receiving side creates periodic authentication data and transmits it to the power transmission side. On the other hand, the collation data creation unit 240 on the power transmission side creates regular verification collation data. Then, the received periodic authentication data is compared with the created periodic authentication verification data, and the periodic authentication for the power receiving device 40 is executed.

  In this way, even when a metal foreign object or the like is inserted between the primary coil L1 and the secondary coil L2 after normal power transmission starts, or when it is replaced with an unauthorized device, It becomes possible to stop power transmission. That is, it becomes possible to detect and prevent so-called hijacking after normal power transmission.

  For example, only authentication in the temporary power transmission period as shown in FIGS. 5A and 5B allows contactless power transmission to an unauthorized power receiving device if an unauthorized power receiving device or the like is used after the start of normal power transmission. Will be. In this regard, as shown in FIG. 6 (A), if periodic authentication of the power receiving device using the periodic authentication data is executed after the start of normal power transmission, such improper power receiving device replacement or the like is detected, and this is dealt with. become able to.

  In the periodic authentication period, data is sent by load modulation or the like while restricting the power supply to the load 90 in order to improve the accuracy of data detection. Therefore, since the power supply efficiency may deteriorate as each periodic authentication period becomes longer, it is desirable to shorten the length of each periodic authentication period as much as possible. In this regard, in FIG. 6A, each periodic authentication is executed only by transferring the periodic authentication data once instead of transferring the data twice as shown in FIGS. 5A and 5B. . Therefore, the length of each periodic authentication period can be shortened, and a decrease in power supply efficiency due to the periodic authentication can be minimized.

  In FIG. 6A, the power receiving side transmits the periodic authentication data to the power transmission side, and the power transmission side performs the periodic authentication of the power receiving apparatus 40 by collating the periodic authentication data. As shown, the power transmission side may transmit periodic authentication data to the power receiving side, and the authentication unit 350 on the power receiving side may collate the periodic authentication data so as to execute periodic authentication for the power transmission device 10.

  Further, as shown in FIG. 6C, periodic authentication can be realized by a challenge-response method. In this case, the challenge data creation unit 220 on the power transmission side creates challenge data for periodic authentication and transmits it to the power reception side. The verification data creation unit 240 creates verification data for periodic authentication. Then, the response data creation unit 322 on the power receiving side creates response data for periodic authentication based on the received challenge data for periodic authentication, and transmits the response data to the power transmission side. Then, the power transmission-side authentication unit 250 performs periodic authentication of the power receiving device 40 by comparing the received response data for periodic authentication with the verification data for periodic authentication.

  5B illustrates the case where the power transmission side creates challenge data and authenticates the power receiving device 40. However, as illustrated in FIG. 7A, the power receiving side creates challenge data and the power transmission device 10 is also configured. You may make it authenticate. That is, in this case, the challenge data creation unit 320, the verification data creation unit 340, and the authentication unit 350 are provided in the processing unit 310 on the power receiving side, and the response data creation unit 222 is provided in the processing unit 210 on the power transmission side.

  Then, following the authentication of the power receiving device 40 in FIG. 5B, the challenge data creation unit 320 on the power receiving side creates challenge data and transmits it to the power transmission side. At this time, the collation data creation unit 340 creates collation data. On the other hand, the response data creation unit 222 on the power transmission side creates response data based on the received challenge data and transmits the response data to the power reception side. Then, the power-reception-side authentication unit 350 compares the received response data with the verification data, and authenticates whether or not the power transmission device 10 is a valid device.

  By doing in this way, since both the authentication of the power receiving side by the power transmission side and the authentication of the power transmission side by the power receiving side are performed, the security can be further strengthened.

  Note that transmission of response data from the power receiving side to the power transmission side shown in FIG. 5B and transmission of challenge data from the power receiving side to the power transmission side shown in FIG. 7A are preferably performed at the same transfer timing. That is, when the response data of FIG. 5B is sent, the challenge data of FIG. 7A is also transmitted by the same packet. In this way, both response data and challenge data can be sent in one transfer, and the efficiency of the authentication process can be improved.

  When periodic authentication is realized by the challenge / response method, the challenge data creation unit 320 on the power receiving side creates challenge data for periodic authentication as shown in FIG. 7B, and the response data creation unit 222 on the power transmission side Response data for periodic authentication may be created. Then, the collation data creation unit 340 on the power receiving side creates collation data for periodic authentication, and the authentication unit 350 collates the received response data for periodic authentication with the collation data, and executes periodic authentication of the power transmission device 10. To do. Moreover, after performing periodic authentication of the power receiving device 40 by the challenge / response method of FIG. 6 (C), periodic authentication of the power transmission device 10 by the challenge / response method of FIG. 7 (B) may be performed.

4). Detailed Example of Authentication Process Next, a detailed example of the authentication process will be described with reference to FIGS.

  FIG. 8A shows an example of the first authentication process of this embodiment. In FIG. 8A, first, the power transmission side (authentication processing device 200) as the authentication host generates a 128-bit random number RN (step S1). The random number RN is transmitted as challenge data to the power receiving side (step S2). Further, an authentication calculation is performed using the random number RN as the challenge data as an input (step S3). For example, AES (Advanced Encryption Standard) encryption is performed. Specifically, the random number RN is encrypted with the common key KEY1. If the verification data, which is encrypted data, is ERNH, ERNH = AES (RN, KEY1).

  Next, ERNC is received as response data from the power receiving side (step S4). Then, the response data ERNC and the verification data ERNH are compared and verified (step S5). In this case, only the device that has the correct common key KEY1 can send the correct response data ERNC, so if they match, it is judged that the authentication was successful, and if they do not match, the authentication failed. to decide.

  When the power receiving side (authentication processing device 300), which is an authentication client, receives a random number RN, which is challenge data (step S11), it performs an authentication calculation using RN as an input (step S12). Specifically, the encryption operation by AES is performed, and the RN is encrypted with the common key KEY1. If the encrypted data is ERNC, it is expressed as ERNC = AES (RN, KEY1), and this ERNC is transmitted as response data to the power transmission side (step S13).

  The common key KEY1 may be stored in advance in the nonvolatile storage units 280 and 380 in FIG. 2, or the common key may be shared using a public key encryption system. Further, decryption may be performed instead of encryption as an authentication operation. Also, ERNC bit inversion data may be sent as response data.

  For example, FIG. 8B shows an example of authentication processing in the case of the public key cryptosystem. First, the power transmission side generates a random number RN and transmits it as challenge data to the power reception side (steps S141 and S142).

  When receiving the challenge data RN from the power transmission side, the power receiving side performs an authentication calculation using RN as an input (steps S151 and S152). Specifically, encryption processing by RSA, which is a public key encryption method, is performed, and RN is encrypted by power receiving side key KEYB. Assuming that the encrypted data is ERNC, ERNC = RSA (RN, KEYB) is represented, and this ERNC is transmitted as response data to the power transmission side (step S153).

  When the power transmission side receives ERNC as response data from the power reception side, the power transmission side performs an authentication calculation using ERNC as an input (steps S143 and S144). Specifically, decryption processing by RSA is performed, and response data ERNC is decrypted by power transmission side key KEYA. When the decrypted data is DRNC, DRNC = DeRSA (RN, KEYA) is expressed, and this DRNC becomes collation data.

  Then, the power transmission side compares the challenge data RN with the verification data DRNC and collates them. If they match, it determines that the authentication has been correctly performed (step S145).

  FIG. 9 shows an example of the second authentication process of the present embodiment. In FIG. 9, in steps S23 and S32, a cryptographic operation by AES is performed using data IRN obtained by bit-inverting the random number RN as an input. The rest is almost the same as the first authentication process in FIG. In the authentication process of FIG. 9 and other authentication processes described below, a public key cryptosystem may be adopted as in FIG. 8B.

  FIG. 10 shows an example of the third authentication process of the present embodiment. In FIG. 10, in steps S43 and S52, the authentication calculation is executed by performing the cryptographic calculation by AES a plurality of times. Specifically, in step S43 on the authentication host side, ERNH1 = AES (RN, KEY1), ERNH2 = AES (ERNH1, KEY2), ... ERNHN = AES (ERNHN-1, KEYN) Create ERNHN. In step S52 on the authentication client side, ERNC1 = AES (RN, KEY1), ERNC2 = AES (ERNC1, KEY2), ... ERNCN = AES (ERNCN-1, KEYN) is calculated and response data ERNCN is calculated. create. Then, authentication is executed by comparing ERNCN and ERNNH in step S45 on the authentication host side.

  Next, a detailed example of the periodic authentication process will be described with reference to FIGS.

  FIG. 11 shows an example of the first periodic authentication process of the present embodiment. FIG. 11 shows an example in which the power transmission side periodically authenticates the power reception side. First, in the first periodic authentication period, the power transmission side performs an operation for periodic authentication with RN + a1 as an input (step S61). More specifically, the calculation of ERNH1 = AES (RN + a1, KEY1) is performed to create verification data ERNH1 for periodic authentication. Also, ERNC1 is received as periodic authentication data from the power receiving side (step S62). Then, ERNC1 and ERNH1 are compared, and if they match, it is determined that the authentication has been correctly performed (step S63).

  In the next second periodic authentication period, the power transmission side performs an operation for periodic authentication with RN + 2 * a1 as an input (step S64). Specifically, the calculation of ERNH2 = AES (RN + 2 * a1, KEY1) is performed to create verification data ERNH2 for periodic authentication. Also, ERNC2 is received as periodic authentication data from the power receiving side (step S65). Then, ERNC2 and ERNH2 are compared, and if they match, it is determined that authentication has been correctly performed (step S66). Thereafter, the above processing is repeated.

  On the other hand, in the first periodic authentication period, the power receiving side performs an operation for periodic authentication with RN + a1 as an input (step S71). Specifically, the periodic authentication data ERNC1 is created by calculating ERNC1 = AES (RN + a1, KEY1). Then, ERNC1 is transmitted as periodic authentication data to the power transmission side (step S72).

  In the next second periodic authentication period, the power receiving side performs an operation for periodic authentication with RN + 2 * a1 as an input (step S73). Specifically, the periodic authentication data ERNC2 is created by calculating ERNC2 = AES (RN + 2 * a1, KEY1). Then, ERNC2 is transmitted as periodic authentication data to the power transmission side (step S74). Thereafter, the above processing is repeated.

  In FIG. 11, since the challenge / response method is not employed, the periodic authentication data need only be transmitted once from the power receiving side to the power transmission side in each periodic authentication period. Therefore, the length of the periodic authentication period can be shortened, and a decrease in power supply efficiency due to the periodic authentication can be minimized.

  Also, as shown in steps S61 and S71 of FIG. 11, in the first periodic authentication process, the periodic authentication verification data ERNH1 and the periodic authentication data ERNC1 are created using the data RN used for the authentication process before the start of normal power transmission. is doing. Specifically, RN + a1 is obtained using the challenge data RN used in the authentication process before starting normal power transmission, and the verification data ERNH1 = AES (RN + a1, KEY1) for periodic authentication is obtained from this RN + a1. Periodic authentication data ERNC1 = AES (RN + a1, KEY1) is created. In this way, it is possible to realize a periodic authentication process with high security without using a challenge / response method or the like.

  That is, in the challenge-response method, the authentication host transmits challenge data to the authentication client, receives response data corresponding to the transmitted challenge data from the authentication client, and compares the response data with the response data, thereby executing authentication processing.

  On the other hand, in FIG. 11, the authentication host does not transmit challenge data to the authentication client, and executes the periodic authentication process using only the periodic authentication data received from the authentication client. In this way, the number of data transfers is only one, and the authentication process can be executed in a short periodical authentication period. In order to execute the periodic authentication process using only the periodic authentication data in this way, it is necessary to determine whether or not the periodic authentication data received from the authentication client is correct data based on some criteria.

  In this regard, in FIG. 11, the authentication client creates and transmits periodic authentication data ERNC1 and ERNC2 using the data RN used in the authentication process before the start of normal power transmission. Also, the authentication host creates regular verification verification data ERNH1 and ERNH2 using the data RN used in the authentication process before the start of normal power transmission, and compares ERNH1 and ERNH2 with the received ERNC1 and ERNC2 to perform periodic authentication processing. Execute. In this way, if the data RN does not match between the authentication host and the authentication client, the periodic authentication verification data and the periodic authentication data do not match, and the security of the periodic authentication process can be ensured. In FIG. 11, the values of the periodic authentication verification data and the periodic authentication data in the first periodic authentication period are different from the values of the periodic authentication verification data and the periodic authentication data in the second periodic authentication period. , Security can be further strengthened. Accordingly, it is possible to realize a periodic authentication process with high security by one data transfer count in which the periodic authentication data is transmitted from the authentication client to the authentication host.

  In steps S61 and S71 of FIG. 11, periodic authentication calculation is performed using the data obtained by bit-inverting RN + a1 as input. In steps S64 and S73, periodic authentication is performed using data obtained by bit-inverting RN + 2 * a1. A calculation may be performed.

  FIG. 12 shows an example of the second periodic authentication process of the present embodiment. FIG. 12 is an example in which the power transmission side periodically authenticates the power reception side. First, in the first periodic authentication period, the power transmission side, for example, leaves an intermediate result of the authentication calculation in step S43 of FIG. 10, and performs the periodic authentication calculation with the data added with a1 as an input (step S81). . Specifically, ERNHi = AES (ERNHi-1 + a1, KEY2)... ERNHN = AES (ERNHN-1, KEYN) is calculated. Also, ERNCN is received as periodic authentication data (step S82). Then, ERNCN and ERNNH are compared, and if they match, it is determined that the authentication has been correctly performed (step S83).

  In the next second periodic authentication period, the power transmission side performs a periodical authentication calculation using data obtained by adding a1 to the intermediate result of the calculation for authentication as an input (step S84). Specifically, ERNHi = AES (ERNHi-1 + 2 * a1, KEY2)... ERNHN = AES (ERNHN-1, KEYN) is calculated. Also, ERNCN is received as periodic authentication data (step S85). Then, ERNCN and ERNNH are compared, and if they match, it is determined that the authentication has been correctly performed (step S86). Thereafter, the above processing is repeated.

  On the other hand, the power receiving side leaves the intermediate result of the authentication calculation in step S52 of FIG. 10, and performs the periodic authentication calculation with the data added with a1 as an input (step S91). Specifically, ERNCi = AES (ERNCi-1 + a1, KEY2)... ERNCN = AES (ERNCN-1, KEYN) is calculated. Then, ERNCN is transmitted as periodic authentication data to the power transmission side (step S92).

  In the next second periodic authentication period, the power receiving side performs a periodical authentication calculation using data obtained by adding a1 to the intermediate result of the authentication calculation as an input (step S93). Specifically, ERNCi = AES (ERNCi-1 + 2 * a1, KEY2)... ERNCN = AES (ERNCN-1, KEYN) is calculated. Then, ERNCN is transmitted as periodic authentication data (step S94). Thereafter, the above processing is repeated.

  As shown in steps S81 and S91 of FIG. 12, even in the second periodic authentication process, using the halfway result data ERNHi and ERNCi used for the authentication process before the start of normal power transmission, periodic authentication verification data and periodic authentication data are used. Have created. By doing so, it is possible to execute a periodic authentication process with high security without using a challenge / response method or the like.

  FIG. 13 shows an example of the third periodic authentication process of the present embodiment. FIG. 13 is an example in which the power receiving side periodically authenticates the power transmission side, unlike FIG.

  That is, in steps S72 and S74 in FIG. 11, the power receiving side transmits periodic authentication data to the power transmission side, but in steps S102 and S104 in FIG. 13, the power transmission side transmits periodic authentication data to the power receiving side. In steps S63 and S66 in FIG. 11, the power transmission side performs authentication on the power receiving side by comparing the periodic authentication data with the collation data. In steps S113 and S116 in FIG. 13, the power receiving side collates with the periodic authentication data. The data is compared to authenticate the power transmission side.

  In FIG. 13, in the second periodical authentication period (i + 1 periodical authentication period in a broad sense), the periodical authentication data transmitted in the first periodical authentication period (ith periodical authentication period in a broad sense) Periodic authentication data with different values is created. For example, as shown in step S101, periodic authentication data in which ERNH1 = AES (RN + a1, KEY1) is created in the first periodic authentication period, and ERNH2 = in the second periodic authentication period, as shown in step S103. Periodic authentication data of AES (RN + 2 * a1, KEY1) is created, and ERNH1 and ERNH2 have different values. By doing so, the security of periodic authentication can be further strengthened.

  FIG. 14 shows an example of the fourth periodic authentication process of the present embodiment. FIG. 14 is also an example in which the power receiving side periodically authenticates the power transmission side, unlike FIG.

  That is, in steps S92 and S94 in FIG. 12, the power receiving side transmits periodic authentication data to the power transmission side, but in steps S122 and S124 in FIG. 14, the power transmission side transmits periodic authentication data to the power receiving side. In steps S83 and S86 in FIG. 12, the power transmission side performs authentication on the power receiving side by comparing the periodic authentication data with the collation data. In steps S133 and S136 in FIG. 14, the power receiving side performs collation with the periodic authentication data. The data is compared to authenticate the power transmission side.

5). Detailed Configuration Example of Power Transmission Device and Power Reception Device FIG. 15 shows a detailed configuration example of the power transmission device 10 and the power reception device 40. In the following description, the components described in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  The waveform monitor circuit 14 generates an induced voltage signal PHIN for waveform monitoring based on the coil end signal CSG of the primary coil L1. The display unit 16 displays various states of the contactless power transmission system (during power transmission, ID authentication, etc.) using colors, images, and the like.

  The oscillation circuit 24 generates a primary side clock. The drive clock generation circuit 25 generates a drive clock that defines the drive frequency. The driver control circuit 26 generates a control signal having a desired frequency based on the drive clock from the drive clock generation circuit 25, the frequency setting signal from the control unit 22, and the like, and the first and second power transmissions of the power transmission unit 12. It outputs to a driver and controls the 1st, 2nd power transmission driver.

  The load state detection circuit 30 shapes the induced voltage signal PHIN to generate a waveform shaping signal. For example, a square wave (rectangular wave) waveform shaping signal (pulse signal) that becomes active (eg, H level) when the signal PHIN exceeds a given threshold voltage is generated. The load state detection circuit 30 detects the pulse width information (pulse width period) of the waveform shaping signal based on the waveform shaping signal and the drive clock. Specifically, the pulse width information of the induced voltage signal PHIN is detected by receiving the waveform shaping signal and the drive clock from the drive clock generation circuit 25 and detecting the pulse width information of the waveform shaping signal.

  The load state detection circuit 30 is not limited to the pulse width detection method (phase detection method), and various methods such as a current detection method and a peak voltage detection method can be employed.

  The control unit 22 (power transmission control device) determines the load state (load fluctuation, load level) on the power receiving side (secondary side) based on the detection result in the load state detection circuit 30. For example, the control unit 22 determines the load state on the power receiving side based on the pulse width information detected by the load state detection circuit 30 (pulse width detection circuit), for example, data (load) detection, foreign object (metal) detection, Perform removal (detachment) detection. That is, the pulse width period, which is the pulse width information of the induced voltage signal, changes according to the change in the load state on the power receiving side. The control unit 22 can detect the load fluctuation on the power receiving side based on the pulse width period (a count value obtained by measuring the pulse width period).

  The power receiving unit 42 converts the AC induced voltage of the secondary coil L2 into a DC voltage. This conversion is performed by a rectifier circuit 43 included in the power receiving unit 42.

  The load modulation unit 46 performs load modulation processing. Specifically, when desired data is transmitted from the power receiving device 40 to the power transmitting device 10, the load at the load modulation unit 46 (secondary side) is variably changed according to the transmission data, and the primary coil L1 The signal waveform of the induced voltage is changed. For this purpose, the load modulation unit 46 includes a resistor RB3 and a transistor TB3 (N-type CMOS transistor) provided in series between the nodes NB3 and NB4. The transistor TB3 is ON / OFF controlled by a signal P3Q from the control unit 52 of the power reception control device 50. When performing load modulation by controlling on / off of the transistor TB3, the transistor TB2 of the power supply control unit 48 is turned off, and the load 90 is not electrically connected to the power receiving device 40.

  The power supply control unit 48 controls power supply to the load 90. The regulator 49 adjusts the voltage level of the DC voltage VDC obtained by the conversion in the rectifier circuit 43 to generate the power supply voltage VD5 (for example, 5V). The power reception control device 50 operates by being supplied with the power supply voltage VD5, for example.

  The transistor TB2 (P-type CMOS transistor, power supply transistor) is controlled by a signal P1Q from the control unit 52 of the power reception control device 50. Specifically, the transistor TB2 is turned off during the authentication process before starting normal power transmission and turned on after starting normal power transmission.

  The position detection circuit 56 determines whether the positional relationship between the primary coil L1 and the secondary coil L2 is appropriate. The oscillation circuit 58 generates a secondary clock. The frequency detection circuit 60 detects the frequency (f1, f2) of the signal CCMPI. The full charge detection circuit 62 detects whether or not the battery 94 (secondary battery) of the load 90 is in a fully charged state (charged state).

  The load 90 can include a charge control device 92 that performs charge control of the battery 94 and the like. The charge control device 92 (charge control IC) can be realized by an integrated circuit device or the like. Note that, like a smart battery, the battery 94 itself may have the function of the charging control device 92.

  Next, details of the operation on the power transmission side and the power reception side will be described using the flowchart of FIG. In FIG. 16, the left column is a power transmission side processing flow, and the right column is a power reception side processing flow.

  When the power is turned on and powered on, the power transmission side waits for a predetermined time (step S201), and then performs temporary power transmission before starting normal power transmission (step S202). This temporary power transmission is temporary power transmission for landing detection, position detection, and the like. That is, power transmission is performed to detect whether or not the electronic device is placed on the charger and, if so, whether or not the electronic device is placed at an appropriate position.

  Due to temporary power transmission from the power transmission side, the power receiving side is powered on from the stopped state (S221) (step S222), and the power reception control device 50 is reset to power on. Then, the power reception control device 50 sets the signal P1Q to the H level, thereby turning off the transistor TB2 (power supply transistor) of the power supply control unit 48 (step S223), and disconnecting the electrical connection with the load 90. Is done.

  Next, the power transmission side creates challenge data with random numbers and transmits it to the power receiving side (step S204). Further, an authentication calculation is performed on the challenge data, and collation data for collation with the response data is created (step S205).

  When the power receiving side receives the challenge data from the power transmission side (step S224), the same authentication calculation as the power transmission side is performed on the challenge data, response data is generated, and transmitted to the power transmission side (steps S225 and S226). ).

  When the power transmission side receives the response data, it compares the response data with the verification data (step S206), authenticates whether or not the power receiving device 40 is an unauthorized device (step S207), and receives the start frame when the authentication is established. (Step S208). On the other hand, if the authentication is not established, the power transmission is stopped and the process returns to step S201. As a result, the power receiving side is stopped (step S221).

  As shown in FIG. 7A, when the power receiving side has a function of authenticating the power transmission side, the power receiving side transmits challenge data together with response data to the power transmission side in step S226. Then, the response data for power transmission side authentication is received from the power transmission side, the received response data for power transmission side authentication is compared with the verification data for power transmission side authentication, and authentication processing on the power transmission side is performed.

  After transmitting the start frame, the power transmission side turns on periodic authentication (step S209) and starts normal power transmission (full-scale power transmission) (step S210).

  When the normal power transmission starts, the power reception side starts power reception, turns on the transistor TB2, and supplies power to the load 90 (step S229). Thereby, for example, the battery 94 is charged. The power receiving side turns on the periodic authentication after the start of normal power transmission (step S230). Then, it is determined whether or not it is a periodic authentication period (step S231). If it is the periodic authentication period, periodic load modulation is performed and the periodic authentication data is transmitted to the power transmission side (step S232). Specifically, the periodic authentication data is transmitted by turning on and off the transistor TB3 of the load modulation unit 46 of FIG. 15 in a predetermined pattern during the periodic authentication period.

  Next, it is determined whether or not the battery 94 is fully charged (step S233). If full charge is detected, the transistor TB2 is turned off and power supply to the load 90 is stopped (step S234). . The periodic authentication is also turned off (step S235). Then, a full charge detection command (save frame) informing the detection of full charge is transmitted to the power transmission side (step S236).

  When the power transmission side receives regular authentication data from the charging side after starting normal power transmission, the power transmission side determines whether or not the periodic authentication has been established (step S211). Specifically, the periodic authentication data and the periodic authentication verification data are compared, and the periodic authentication of the power receiving device 40 is executed. If the periodic authentication data does not match the periodic authentication verification data, the power transmission is stopped and the process returns to step S201.

  Further, the power transmission side performs removal detection and foreign object detection (steps S212 and S213), and when removal or foreign object is detected, power transmission is stopped and the process returns to step S201.

  Next, the power transmission side determines whether or not a full charge detection command (save frame) is received from the power reception side (step S214). If a full charge detection command is received, periodic authentication is turned off (step S215), power transmission is stopped, and the process returns to step S201.

  Next, periodic authentication will be described with reference to FIG. Periodic authentication refers to a so-called foreign object hijacking state or illegal equipment by, for example, intermittently changing the load on the power receiving side and detecting the intermittent load fluctuation on the power transmission side in each periodic authentication period of the normal power transmission period. Is detected.

  That is, after the authentication process is completed and normal power transmission (full-scale power transmission) starts, for example, a large-area metal foreign object may be inserted between the primary coil L1 and the secondary coil L2. Metal foreign matter having a small to medium area can be detected by monitoring the induced voltage signal of the primary coil L1. However, when a large-sized metal foreign object is inserted, the metal foreign object appears to the power transmission side as the same load as the main load. Therefore, since the authentication process before the start of normal power transmission has been completed, the power transmission side regards the metal foreign object as a load, continues power transmission, and power transmission energy from the power transmission side continues to be consumed by the metal foreign object. End up. As a result, a problem arises in that the metal foreign matter becomes a high temperature. In this embodiment, a phenomenon in which a large-sized metal foreign object or the like replaces the original power-receiving device and power is continuously transmitted to the foreign object is referred to as a “takeover state” in this embodiment.

  In order to detect such a hijacking state, in FIG. 17, the load on the power receiving side is intermittently changed in the periodic authentication period TA. Specifically, the load modulation signal P3Q is intermittently changed to turn on / off the transistor TB3 of the load modulation unit 46 in FIG. 15 intermittently. When the transistor TB3 is turned on, the power receiving side has a relatively high load (small impedance), and when the transistor TB3 is turned off, the power receiving side has a relatively low load (high impedance). The load state detection circuit 30 on the power transmission side detects this intermittent load fluctuation on the power reception side. For example, a change in load on the power receiving side is detected by detecting a change in the pulse width period of the coil end signal.

  In the present embodiment, the periodic authentication for preventing such a hijacking state due to a foreign object is also used for preventing unauthorized device replacement after the start of normal power transmission. That is, in each periodic authentication period of FIG. 17, the periodic authentication data is transmitted as shown in FIG. When the transmitted periodic authentication data is not appropriate data, for example, by stopping power transmission, a situation where power is supplied to an unauthorized power receiving device 40 is prevented.

6). Modification FIG. 18 shows a modification of the present embodiment. In this modification, a host I / F (interface) 27 and a register unit 23 are provided for the power transmission control device 20, and a host I / F 57 and a register unit 53 are provided for the power reception control device 50. The host I / F 27 is connected to the power transmission side host 2 and the authentication processing device 200 via a bus, and the host I / F 57 is connected to the power reception side host 4 and the authentication processing device 300 via a bus. The These hosts (host processors) 2 and 4 can be realized by, for example, a CPU, an application processor, an ASIC circuit, and the like, and perform various processes such as an overall control process of an electronic device on a power transmission side or a power reception side.

  The register unit 23 (storage unit) on the power transmission side can be accessed (written and read) by the host 2 on the power transmission side via the host I / F 27, and can be realized by, for example, a RAM or a D flip-flop. The register unit 23 includes an information register 110, a status register 112, a command register 114, an interrupt register 116, and a data register 118. Information stored in the register unit 23 (for example, information stored in the information register 110) may be stored in a non-volatile memory such as a flash memory or a mask ROM.

  The information register 110 is a register for storing information such as transmission conditions and communication conditions for contactless power transmission. For example, parameters of drive frequency and drive voltage, parameters (threshold values) for detecting the load state on the power receiving side, and the like are stored. The status register 112 is a register for the host 2 to check various states such as a power transmission state and a communication state. The command register 114 is a register for the host 2 to write various commands. The interrupt register 116 is a register for various interrupts, and includes, for example, a register for setting enable / disable of each interrupt and a register for notifying the host 2 of the interrupt factor. The data register 118 is a register for buffering transmission data and reception data.

  The host I / F 27 on the power transmission side is an interface for communicating with the host 2 on the power transmission side. In FIG. 18, communication is realized by I2C (Inter Integrated Circuit). Here, the host 2 is a CPU or the like mounted on an electronic device (charger) on the power transmission side.

  I2C is a communication method for exchanging data between a plurality of devices arranged at a short distance in the same board or the like. Two devices, SDA (serial data) and SCL (serial clock), are used between the plurality of devices. These signal lines are shared as a bus for communication. Specifically, communication is realized by setting one device as a master (host) and bus-connecting a plurality of devices as slaves thereto. Further, the slave side can interrupt the master using XINT (external Interrupt). Alternatively, an interrupt request can be made from the I2C bus.

  The power-receiving-side register unit 53 (storage unit) can be accessed by the power-receiving-side host 4 via the host I / F 57, and can be realized by, for example, a RAM or a D flip-flop. The register unit 53 includes an information register 130, a status register 132, a command register 134, an interrupt register 136, and a data register 138. Information stored in the register unit 53 (for example, information stored in the information register 130) may be stored in a nonvolatile memory such as a flash memory or a mask ROM. The functions of these registers are almost the same as the registers on the power transmission side, and thus description thereof is omitted.

  The host I / F 57 on the power receiving side is an interface for communicating with the host 4 on the power receiving side through, for example, I2C. Here, the host 4 is a CPU, an application processor, or the like mounted on the electronic device on the power receiving side.

  In the modification of FIG. 18, the host I / Fs 27 and 57 are provided on the power transmission side and the power reception side, thereby enabling communication between the hosts 2 and 4 on the power transmission side and the power reception side. That is, in the conventional contactless power transmission system, only ID authentication information can be communicated between the power transmission side and the power reception side. On the other hand, according to the configuration of FIG. 18, for example, application data can be communicated between a power transmission side device such as a charger and a power reception side device such as a mobile phone using contactless power transmission. It becomes possible. Therefore, it is possible to communicate data between devices by effectively using the charging period and the like, so that the convenience for the user can be greatly improved.

  Specifically, in FIG. 18, it is assumed that a communication request command for requesting communication between the host 2 on the power transmission side and the host 4 on the power reception side is written to the register unit 23 by the host 2 via the host I / F 27. To do. In this case, the power transmission-side control unit 22 shifts to a communication mode in which communication is performed between the hosts 2 and 4 and transmits the communication request command to the power receiving device 40. For example, the operation mode (sequence) on the power transmission side is shifted to a communication mode for performing communication sequence processing, and a communication request command (packet) is transmitted to the power reception side by non-contact power transmission (inter-coil communication).

  On the other hand, when receiving a communication request command for requesting communication between the hosts 2 and 4 from the power transmission device 10, the control unit 52 on the power receiving side shifts to the communication mode. For example, when a communication request command is transmitted from the power transmission side, reception of the command is notified to the host 4 and the operation mode on the power reception side also shifts to the communication mode. As a result, communication between the hosts 2 and 4 becomes possible.

  The control unit 22 also shifts to the communication mode when receiving an interrupt command for a communication request issued by the host 4 on the power receiving side. Specifically, when the host 4 issues an interrupt command for a communication request, the reception of this command is notified to the host 2 by the interrupt register 116, and the control unit 22 shifts to the communication mode. By doing so, it becomes possible to shift to the communication mode not only by a communication request from the host 2 on the power transmission side but also by a communication request from the host 4 on the power reception side. Therefore, it is possible to make a communication request from the power receiving side to the power transmission side at a desired timing, and to communicate desired data between the hosts 2 and 4.

  The power-receiving-side register unit 53 also includes a command register 134 into which a command issued by the power-receiving-side host 4 is written. Then, when an interrupt command (INT) for a communication request to the power transmission side host 2 is written in the command register 134 by the power reception side host 4, the power reception side control unit 52 shifts to the communication mode.

  In FIG. 18, the power transmission side authentication processing device 200 includes an I / F unit 290 for communicating with the host I / F 27 included in the power transmission control device 20. Then, the processing unit 210 of the authentication processing device 200 performs processing for communicating challenge data and response data with the power transmission control device 20 via the I / F unit 290.

  For example, the processing unit 210 of the authentication processing device 200 creates challenge data, and transmits the created challenge data to the power transmission control device 20 via the I / F unit 290. Then, the power transmission control device 20 transmits the challenge data received from the authentication processing device 200 to the power receiving device 40 by inter-coil communication for contactless power transmission.

  Further, when the power transmission control device 20 receives response data from the power receiving device 40 through inter-coil communication for contactless power transmission, the processing unit 210 of the authentication processing device 200 receives the response from the power transmission control device 20 via the I / F unit 290. Receive response data. Then, the received response data is compared with the verification data, and authentication of the power receiving device 40 is executed.

  Similarly, the authentication processing apparatus 300 on the power reception side includes an I / F unit 390 for communicating with the host I / F 57 included in the power reception control apparatus 50. Then, the processing unit 310 of the authentication processing device 300 performs processing for communicating challenge data and response data with the power reception control device 50 via the I / F unit 390.

  For example, the power reception control device 50 receives challenge data from the power transmission device 10 by inter-coil communication for contactless power transmission. Then, the processing unit 310 of the authentication processing device 300 receives challenge data from the power reception control device 50 via the I / F unit 390.

  Then, the processing unit 310 creates response data corresponding to the received challenge data, and transmits the response data to the power reception control device 50 via the I / F unit 390. Then, the power reception control device 50 transmits response data from the authentication processing device 300 to the power transmission device 10 by inter-coil communication for contactless power transmission.

  According to the modification of FIG. 18, the host I / Fs 27 and 57 for communicating application data between the hosts 2 and 4 are effectively used, and the authentication processing devices 200 and 300 are connected to the power transmission control device 20 and the power reception control device. 50, communication data and response data can be communicated. That is, by simply connecting the authentication processing devices 200 and 300 to the buses of the host I / Fs 27 and 57, the authentication of the power transmission device 10 and the power reception device 40 by the challenge / response method can be realized, and the security of authentication is strengthened. It becomes possible to do.

  The communication method between the host and the host I / F is not limited to I2C, and may be a communication method based on the same idea as I2C, or a communication method of a normal serial interface or parallel interface.

  For example, FIG. 19 shows an example of a communication method realized by a single line. In FIG. 19, in the address period after the idle period, the address (ADDRS) of the device that is the communication destination is set. In a data period after the address period, data is written to the device (WR) or data is read from the device (RD). And after a data period, it returns to an idle period.

  According to the communication method of FIG. 19, a power transmission side bus connecting the power transmission control device 20, the host 2, and the authentication processing device 200, and a bus connecting the power reception control device 50, the host 4, and the authentication processing device 300 are connected to a single line. Can be realized. Therefore, the number of terminals of the IC and circuit board can be reduced, and communication between a plurality of devices can be realized in a space-saving manner.

  Although the present embodiment has been described in detail as described above, it will be easily understood by those skilled in the art that many modifications can be made without departing from the novel matters and effects of the present invention. Accordingly, all such modifications are intended to be included in the scope of the present invention. For example, a term described together with a different term having a broader meaning or the same meaning at least once in the specification or the drawings can be replaced with the different term anywhere in the specification or the drawings. All combinations of the present embodiment and the modified examples are also included in the scope of the present invention. In addition, the configuration / operation of the authentication processing device, the power transmission control device, the power transmission device, the power reception control device, the power reception device, the authentication method, the communication processing, and the like are not limited to those described in the present embodiment, and various modifications can be made It is.

1A to 1C are explanatory diagrams of contactless power transmission. 2 is a configuration example of an authentication processing device, a power transmission device, and a power reception device of the present embodiment. 3A and 3B are explanatory diagrams of data transfer by frequency modulation and load modulation. FIG. 4A to FIG. 4C are explanatory diagrams of the operation of this embodiment. FIG. 5A to FIG. 5C are explanatory diagrams of the operation of this embodiment. 6A to 6C are explanatory diagrams of the operation of the present embodiment. 7A and 7B are explanatory diagrams of the operation of this embodiment. FIG. 8A and FIG. 8B are examples of the first authentication process of this embodiment. The example of the 2nd authentication process of this embodiment. The example of the 3rd authentication process of this embodiment. The example of the 1st periodical authentication process of this embodiment. The example of the 2nd periodical authentication process of this embodiment. The example of the 3rd periodical authentication process of this embodiment. The example of the 4th periodical authentication process of this embodiment. 3 is a detailed configuration example of a power transmission device, a power transmission control device, a power reception device, and a power reception control device. The flowchart for demonstrating the operation | movement of this embodiment. Explanatory drawing of periodical authentication. The modification of this embodiment. Explanatory drawing of the communication system using a single line.

Explanation of symbols

L1 primary coil, L2 secondary coil, 2 hosts (power transmission side), 4 hosts (power reception side),
DESCRIPTION OF SYMBOLS 10 Power transmission apparatus, 12 Power transmission part, 14 Waveform monitor circuit, 16 Display part,
20 power transmission control device, 22 control unit (power transmission side), 23 register unit, 24 oscillation circuit,
25 drive clock generation circuit, 26 driver control circuit, 27 host I / F,
30 load state detection circuit, 40 power receiving device, 42 power receiving unit, 43 rectifier circuit,
46 load modulation unit, 48 power supply control unit, 50 power reception control device, 52 control unit (power reception side), 53 register unit, 56 position detection circuit, 57 host I / F, 58 oscillation circuit,
59 detection circuit, 60 frequency detection circuit, 62 full charge detection circuit, 90 load,
92 charge control device, 94 battery, 100 power transmission sequence control unit,
102 transmission control unit, 104 reception control unit, 106 detection determination unit,
108 Periodic authentication judgment unit, 110 information register, 112 status register,
114 command register, 116 interrupt register, 118 data register,
120 power reception sequence control unit, 122 transmission control unit, 124 reception control unit,
126 detection determination unit, 128 periodic authentication control unit, 130 information register,
132 Status register, 134 Command register, 136 Interrupt register,
138 data register,
200 authentication processing device, 210 processing unit, 220 challenge data creation unit,
222 Response data creation unit, 224 Periodic authentication data creation unit,
230 transmission processing unit, 240 verification data creation unit, 250 authentication unit,
280 storage unit, 290 I / F unit, 300 authentication processing device, 310 processing unit,
320 Challenge data creation unit, 322 Response data creation unit,
324 periodic authentication data creation unit, 330 transmission processing unit, 340 collation data creation unit,
350 Authentication unit, 380 Storage unit, 390 I / F unit

Claims (26)

Non-contact power that electromagnetically couples the primary coil of the power transmission device and the secondary coil of the power reception device to transmit power from the power transmission device to the power reception device and supplies power to the load of the power reception device An authentication processing device provided in the power transmission device of a transmission system,
Including a processing unit for performing authentication processing,
The processor is
A challenge data creation unit for creating challenge data for authenticating the power receiving device;
A transmission processing unit that performs processing for transmitting the created challenge data to the power receiving device by inter-coil communication of contactless power transmission;
A verification data creation unit for performing verification computation and creating verification data;
When response data created by performing a calculation for authentication on the challenge data with respect to the challenge data is received from the power receiving device by inter-coil communication of non-contact power transmission, by the verification process using the verification data, An authentication unit for authenticating the power receiving device;
An authentication processing device comprising: In claim 1,
The collation data creation unit
Create the verification data using the challenge data and power transmission side key information,
The authentication unit
When the response data created using the challenge data and the power receiving side key information is received from the power receiving apparatus, the received response data and the verification data are verified to authenticate the power receiving apparatus. An authentication processing device. In claim 1,
The collation data creation unit
When the response data created using the challenge data and the power receiving side key information is received from the power receiving device, the verification data is created using the received response data and the power transmitting side key information,
The authentication unit
An authentication processing apparatus, wherein the challenge data and the verification data are verified to authenticate the power receiving apparatus. In any one of Claims 1 thru | or 3,
The processor is
An authentication processing apparatus that performs authentication processing using challenge data and response data in a temporary power transmission period before starting normal power transmission. In claim 4,
The temporary power transmission period is a power transmission period for information communication between a power transmission side and a power reception side before the start of normal power transmission. In any one of Claims 1 thru | or 5,
The processor is
An authentication processing device that performs periodic authentication processing in a periodic authentication period after the start of normal power transmission. In claim 6,
The collation data creation unit
Create verification data for periodic authentication by performing periodic authentication calculations,
The authentication unit
When periodic authentication data is received from the power receiving device by inter-coil communication of contactless power transmission, the received periodic authentication data and the periodic authentication verification data are collated to perform periodic authentication of the power receiving device. An authentication processing device. In claim 7,
The collation data creation unit
An authentication processing apparatus, characterized in that the verification data for periodic authentication is created using data used for authentication processing before starting normal power transmission. In claim 6,
The processor is
A periodic authentication data creating unit that creates periodic authentication data for the power receiving device to periodically authenticate the power transmitting device;
The transmission processing unit
An authentication processing device that performs processing for transmitting the created periodic authentication data to the power receiving device by inter-coil communication of contactless power transmission. In claim 9,
The periodic authentication data creation unit
An authentication processing apparatus, wherein periodic authentication data having a value different from the periodic authentication data transmitted in the i-th periodic authentication period is created in the (i + 1) -th periodic authentication period (i is a natural number). In claim 6,
The processor is
An authentication processing apparatus that performs periodic authentication processing using challenge data and response data in a periodic authentication period after starting normal power transmission. In any one of Claims 1 thru | or 11,
An interface unit for communicating with a host interface included in a power transmission control device provided in the power transmission device;
The power transmission control device includes:
Controls inter-coil communication for power transmission control and contactless power transmission,
The processor is
An authentication processing device that performs processing for communicating challenge data and response data with the power transmission control device via the interface unit. An authentication processing device according to any one of claims 1 to 12,
A power transmission control device that controls inter-coil communication of power transmission control and contactless power transmission;
And a power transmission unit that generates an AC voltage and supplies the AC voltage to the primary coil.   An electronic apparatus comprising the power transmission device according to claim 13. Non-contact power that electromagnetically couples the primary coil of the power transmission device and the secondary coil of the power reception device to transmit power from the power transmission device to the power reception device and supplies power to the load of the power reception device An authentication processing device provided in the power receiving device of a transmission system,
Including a processing unit for performing authentication processing,
The processor is
When challenge data for authenticating the power receiving device is received from the power transmitting device by inter-coil communication for contactless power transmission, an authentication calculation is performed on the received challenge data to create response data A response data creation unit;
A transmission processing unit that performs processing for transmitting the created response data to the power transmission device by inter-coil communication of contactless power transmission;
An authentication processing device comprising: In claim 15,
The processor is
An authentication processing apparatus that performs authentication processing using challenge data and response data in a temporary power transmission period before starting normal power transmission. In claim 16,
The temporary power transmission period is a power transmission period for information communication between a power transmission side and a power reception side before the start of normal power transmission. In any of claims 15 to 17,
The processor is
An authentication processing device that performs periodic authentication processing in a periodic authentication period after the start of normal power transmission. In claim 18,
The processor is
A periodic authentication data creating unit for creating periodic authentication data for the power transmission device to periodically authenticate the power receiving device;
The transmission processing unit
An authentication processing device that performs processing for transmitting the created periodic authentication data to the power transmission device by inter-coil communication of contactless power transmission. In claim 19,
The periodic authentication data creation unit
An authentication processing apparatus, wherein periodic authentication data having a value different from the periodic authentication data transmitted in the i-th periodic authentication period is created in the (i + 1) -th periodic authentication period (i is a natural number). In claim 19 or 20,
The periodic authentication data creation unit
An authentication processing apparatus characterized in that the periodic authentication data is created using data used for authentication processing before starting normal power transmission. In claim 18,
The processor is
Includes a verification data creation unit that creates periodic verification verification data by performing periodic verification computations,
The authentication unit
When periodic authentication data is received from the power transmission device by inter-coil communication for contactless power transmission, the received periodic authentication data is compared with the periodic authentication verification data to perform periodic authentication of the power transmission device. An authentication processing device. In claim 22,
The collation data creation unit
An authentication processing apparatus, characterized in that the verification data for periodic authentication is created using data used for authentication processing before starting normal power transmission. 24. Any of claims 15 to 23.
An interface unit for communicating with a host interface included in a power reception control device provided in the power reception device;
The power reception control device includes:
Controls inter-coil communication for power reception control and contactless power transmission,
The processor is
An authentication processing device that performs processing for communicating challenge data and response data with the power reception control device via the interface unit. An authentication processing device according to any one of claims 15 to 24;
A power reception control device for controlling power reception control and inter-coil communication for contactless power transmission;
And a power receiving unit that converts an induced voltage of the secondary coil into a DC voltage. A power receiving device according to claim 25;
An electronic apparatus comprising: a load to which power is supplied by the power receiving device.

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