JP2011045190A - Power transmission control unit, power transmission device, power reception control unit, power reception device, and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmission control unit capable of facilitating radio communication setting, and to provide a power transmission device, a power reception control unit, a power reception device, electronic apparatus, and the like. <P>SOLUTION: The power transmission control unit 20 includes a control section 30 for performing control for transmitting power to the power reception device 40 by non-contact power transmission, and a communication processing section 21, that performs communication control for communicating radio setting information for radio communication between a power-transmission side radio communication section 70 and a power reception side radio communication section 80 by inter-coil communication using primary and secondary coils L1, L2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a power transmission control device, a power transmission device, a power reception control 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 mobile devices such as telephones has been proposed.

  For example, Patent Document 1 is a conventional technique for such contactless power transmission. In Patent Document 1, proper power transmission is realized by transmitting and receiving an authentication code by inter-coil communication between a power receiving device (secondary side) and a power transmitting device (primary side).

  In addition, by mounting wireless communication means such as a wireless LAN and Bluetooth (registered trademark) on a portable device, efficient data communication with a personal computer or the Internet is possible.

  However, when such wireless communication means are used, there are problems such as that manual initial setting is necessary and that the battery may be consumed during wireless communication and communication may be interrupted.

JP 2006-60909 A

  According to some aspects of the present invention, it is possible to provide a power transmission control device, a power transmission device, a power reception control device, a power reception device, an electronic device, and the like that can facilitate wireless communication settings.

  One embodiment of the present invention includes a control unit that performs control for transmitting power to a power receiving device using a primary coil and a secondary coil by non-contact power transmission, a power transmission side wireless communication unit, and a power reception side wireless communication. A power transmission control device including a communication processing unit that performs communication control for communicating wireless setting information for performing wireless communication with a unit through inter-coil communication using the primary coil and the secondary coil. Involved.

  According to one aspect of the present invention, since wireless setting information for performing wireless communication such as wireless LAN and Bluetooth (registered trademark) is performed by inter-coil communication, settings that have been manually performed by a conventional user are unnecessary. Become. Taking the case where the electronic device on the power receiving side is a portable device as an example, the user can place the portable device on a charging stand or the like that is the electronic device on the power transmission side, for example. Become. Furthermore, since the inter-coil communication has a very short communication distance (for example, about several centimeters), there is little risk of the wireless setting information being intercepted by others, and unauthorized access such as impersonation by other portable devices can be suppressed.

  In one aspect of the present invention, the control unit uses the primary coil and the secondary coil during a period in which wireless communication is performed between the power transmission side wireless communication unit and the power reception side wireless communication unit. You may perform control which transmits electric power by non-contact electric power transmission.

  In this way, wireless communication can be performed while supplying power to the portable device by contactless power transmission, so that for example, the battery of the electronic device can be prevented from being consumed during wireless communication, Wireless communication can be performed without concern.

  In one aspect of the present invention, the communication processing unit performs processing for receiving wireless setting request information from the power receiving device. When the wireless setting request information is received, the communication processing unit transmits the wireless setting information to the power receiving device. You may perform the process transmitted to.

  In this way, for example, wireless setting information can be transmitted from the power transmission side in response to a wireless setting request from the electronic device on the power receiving side.

  Moreover, in one aspect of the present invention, the removal detection unit that detects removal of the power receiving device, and the power transmission side wireless communication unit and the power reception side wireless communication unit when the removal detection unit detects removal of the power reception device. And a wireless connection setting unit that sets wireless communication with the wireless communication device to a non-connected state.

  In this way, when the removal is detected, for example, when the electronic device is removed from the charging stand or the like, the wireless communication can be disconnected.

  Moreover, in one aspect of the present invention, the wireless connection setting unit and the power transmission side wireless communication unit can be configured by turning off power supply to the power transmission side wireless communication unit or changing the wireless setting information. Wireless communication with the power receiving side wireless communication unit may be set to a non-connected state.

  In this way, when the removal of the power receiving device is detected, the wireless communication can be set to a disconnected state, and unauthorized access such as impersonation by other portable devices can be suppressed.

  In one aspect of the present invention, the control unit determines whether to permit power transmission to the power receiving device based on a result of authentication processing based on authentication information from the power receiving device, and the power transmission side wireless communication unit. And whether to allow wireless communication between the power receiving side wireless communication unit and the power receiving side wireless communication unit.

  In this way, power transmission can be permitted, for example, when the power transmission side can adapt to the standard of the power reception side, the shape of the coil, and the like. Further, when the wireless communication means and the authentication method provided on the power transmission side and the power reception side match and authentication is performed, wireless communication can be permitted.

  In one aspect of the present invention, the control unit includes a negotiation processing unit that performs the contactless power transmission negotiation process, and a setup processing unit that performs the contactless power transmission setup process based on a result of the negotiation process. The setup processing unit may exchange information on whether or not to perform wireless communication between the power transmission side wireless communication unit and the power reception side wireless communication unit in the setup process.

  In this way, the setup processing unit can exchange information such as a wireless communication method, an authentication method, and an encryption method in the setup processing after the negotiation processing.

  In one aspect of the present invention, the control unit includes a command processing unit that performs the contactless power transmission command processing after the setup processing, and the command processing unit wirelessly transmits wireless setting request information from the power receiving device. When a setting request command is received, wireless setting processing including transmission processing of the wireless setting information may be performed.

  In this way, the command processing unit can perform the wireless setting process by transmitting the wireless setting information in response to the wireless setting request command from the power receiving side in the command processing after the setup process. Also, wireless connection processing can be efficiently performed by using each processing (negotiation processing, setup processing, command processing) for contactless power transmission.

  In the aspect of the invention, the setup processing unit may perform the wireless setting information transmission process in the setup process.

  In this way, the command processing unit can perform the wireless setting information transmission process in the setup process instead of performing the wireless setting process including the wireless setting information transmission process.

  Moreover, the other aspect of this invention is related with the power transmission apparatus containing the power transmission control apparatus as described above, and the power transmission part which produces | generates an alternating voltage and supplies it to the said primary coil.

  Moreover, the other aspect of this invention is related with the electronic device containing the power transmission apparatus as described above and the said power transmission side radio | wireless communication part.

  Another aspect of the present invention includes a control unit that performs control for receiving power from a power transmission device using a primary coil and a secondary coil by non-contact power transmission, a power transmission side wireless communication unit, and a power reception side. Power reception control including a communication processing unit that performs communication control for communicating wireless setting information for performing wireless communication with the wireless communication unit by inter-coil communication using the primary coil and the secondary coil. Related to the device.

  According to another aspect of the present invention, since wireless setting information for performing wireless communication such as wireless LAN and Bluetooth (registered trademark) is performed by inter-coil communication, settings that have been manually performed by a conventional user are unnecessary. become. Taking the case where the electronic device on the power receiving side is a portable device as an example, the user can place the portable device on a charging stand or the like that is the electronic device on the power transmission side, for example. Become. Furthermore, since the inter-coil communication has a very short communication distance (for example, about several centimeters), there is little risk of the wireless setting information being intercepted by others, and unauthorized access such as impersonation by other portable devices can be suppressed.

  In another aspect of the present invention, the control unit uses the primary coil and the secondary coil during a period in which wireless communication is performed between the power transmission side wireless communication unit and the power reception side wireless communication unit. You may perform control which receives electric power by the said non-contact electric power transmission.

  In this way, wireless communication can be performed while supplying power to the portable device by contactless power transmission, so that, for example, the battery of the portable device can be prevented from being consumed during wireless communication, the remaining battery level, etc. Wireless communication can be performed without concern.

  In another aspect of the present invention, the communication processing unit may perform a process of transmitting wireless setting request information to the power transmission device and perform a process of receiving the wireless setting information from the power transmission device.

  In this way, for example, the electronic device on the power receiving side can transmit the wireless setting request information and receive the wireless setting information from the power transmission side.

  In another aspect of the present invention, a wireless connection setting unit that sets wireless communication between the power transmission side wireless communication unit and the power reception side wireless communication unit to a disconnected state when the contactless power transmission is stopped. May be included.

  In this way, for example, when the electronic device is removed from the charging stand or the like and the power transmission is stopped, the wireless communication can be disconnected.

  In another aspect of the present invention, the wireless connection setting unit may turn off the power supply to the power receiving side wireless communication unit or change the wireless setting information, thereby transmitting the power transmission side wireless communication unit. And wireless communication between the power receiving side wireless communication unit and the power receiving side wireless communication unit may be set in a disconnected state.

  In this way, when contactless power transmission stops, wireless communication can be set to a non-connected state, and unauthorized access such as impersonation by other portable devices can be suppressed.

  In another aspect of the present invention, the control unit includes a negotiation processing unit that performs the contactless power transmission negotiation process, and a setup process that performs the contactless power transmission setup process based on a result of the negotiation process. The setup processing unit may exchange information on whether or not to perform wireless communication between the power transmission side wireless communication unit and the power reception side wireless communication unit in the setup process.

  In this way, the setup processing unit can exchange information such as a wireless communication method, an authentication method, and an encryption method in the setup processing after the negotiation processing.

  Another aspect of the present invention relates to a power reception device including the power reception control device described above and a power reception unit that converts an induced voltage of the secondary coil into a DC voltage.

  Another aspect of the invention relates to an electronic apparatus including the power receiving device described above and the power receiving side wireless communication unit.

1A is an example of an electronic device, and FIGS. 1B and 1C are explanatory diagrams of contactless power transmission. Configuration examples of a power transmission device, a power transmission control device, a power reception device, and a power reception control device. 3A and 3B are explanatory diagrams of communication between coils by frequency modulation and load modulation. Explanatory drawing of the processing sequence of non-contact electric power transmission and wireless connection. Explanatory drawing of the processing sequence of non-contact electric power transmission and wireless connection. 6A to 6C show examples of negotiation frame formats. 7A to 7B are explanatory diagrams of operations for wireless connection. 8A to 8B are explanatory diagrams of operations for wireless connection. An example of the flowchart of operation | movement of a power transmission apparatus and a power receiving apparatus. An example of the flowchart of operation | movement of a power transmission apparatus and a power receiving apparatus.

  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 of this embodiment. A charger 500 (cradle), which is one of electronic devices, includes a power transmission device 10 and a wireless communication unit (power transmission side) 70. A mobile phone 510 that is one of the electronic devices includes the power receiving device 40 and a wireless communication unit (power receiving side) 80. 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 a mobile phone 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 and the device in the mobile phone 510 can be operated.

  The wireless communication units 70 and 80 are connected to a charger 500 (electronic power transmission side electronic device) and a mobile phone 510 by wireless communication means such as a wireless LAN (IEEE802.11, etc.), Bluetooth (registered trademark) (IEEE802.5.1, etc.), for example. Wireless communication with the (power-receiving-side electronic device) is performed. Specifically, for example, necessary data can be exchanged by wireless communication between a personal computer (PC) connected to the charger 500 and the mobile phone 510.

  As will be described later, according to the electronic apparatus of the present embodiment, power can be supplied to the mobile phone 510 by contactless power transmission during the period in which the wireless communication is performed. Furthermore, wireless communication necessary for wireless connection such as wireless LAN and Bluetooth (registered trademark) is achieved by inter-coil communication between the primary coil L1 (power transmission coil) and the secondary coil L2 (power reception coil) used for contactless power transmission. Setting information can be exchanged. The wireless communication unit 70 may be outside the charger 500, and the wireless communication unit 80 may be outside the mobile phone 510.

  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. FIG. 2 shows a configuration example of the power transmission device 10, the power transmission control device 20, the power reception device 40, and the power reception control device 50 of the present embodiment. The power transmission device (power transmission module, primary module) 10 of the present embodiment includes a primary coil L1, a power transmission unit 12, and a power transmission control device 20.

  In the configuration example of FIG. 2, the wireless communication unit (power transmission side) 70 and the first antenna ANT1 are provided outside the power transmission device 10, but they may be included in the power transmission device 10. Similarly, although the wireless communication unit (power receiving side) 80 and the second antenna ANT2 are provided outside the power receiving device 40, they may be included in the power receiving device 40.

  The power transmission device 10 and the power transmission control device 20 of the present embodiment are not limited to the configuration in FIG. 2, and some of the components are omitted, replaced with other components, or other components are added. Various modifications such as these are possible.

  The power transmission unit 12 generates an alternating voltage and supplies it to the primary coil L1. Specifically, an AC voltage having a predetermined frequency is generated during power transmission, and an AC voltage having a different frequency according to the data is generated during data transfer and supplied to the primary coil L1. The power transmission unit 12 configures a resonance circuit together with, for example, 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 the primary coil L1. At least one condenser. Each of the first and second power transmission drivers included in the power transmission unit 12 is an inverter circuit (buffer circuit) configured by, for example, a power MOS transistor, and is controlled by the power transmission control device 20.

  The primary coil L1 (power transmission side coil) transmits power from the power transmission device 10 to the power reception device 40 by electromagnetically coupling with the secondary coil L2 (power reception side coil) to form a power transmission transformer. A contactless power transmission (non-contact power transmission) system that supplies power to the load 90 is realized.

  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) or the like. The power transmission control device 20 includes a control unit 30, a communication processing unit 21, a removal detection unit 22, a wireless connection setting unit 23, and a storage unit 24. In addition, some implementations, such as abbreviate | omitting some of these components and adding another component, are possible.

  The control unit 30 controls the power transmission device 10 and the power transmission control device 20. The control unit 30 can be realized by an ASIC circuit such as a gate array, or can be realized by a microcomputer and a program operating on the microcomputer. The control unit 30 controls power transmission using the power transmission unit 12, performs control of the communication processing unit 21, removal detection unit 22, and wireless connection setting unit 23, and performs storage control of the storage unit 24. Specifically, various sequence control and determination processes necessary for power transmission, communication of wireless setting information for wireless connection, removal detection, connection / disconnection of wireless communication, and the like are performed.

  Furthermore, the control unit 30 transmits power to the power receiving device 40 based on the result of the authentication process based on the authentication information from the power receiving device 40, and wireless communication between the power transmission side wireless communication unit 70 and the power reception side wireless communication unit 80. It is determined whether or not to allow.

  The authentication information includes, for example, information about the power receiving side coil, and it is determined whether or not the power transmitting side coil and the power receiving side coil are compatible. Further, the authentication information includes information on the wireless communication method, the security setting method, and the like, and it is determined whether or not these are compatible between the power transmission side and the power reception side.

  In addition, the control unit 30 supplies power by contactless power transmission using the primary coil L1 and the secondary coil L2 during a period in which wireless communication is performed between the power transmission side wireless communication unit 70 and the power reception side wireless communication unit 80. Control to transmit power can be performed. In this way, it is possible to prevent the battery of the portable device (power-receiving-side electronic device) from being consumed during the wireless communication, and wireless communication can be performed without worrying about the remaining battery level. However, contactless power transmission is not always required during the period of wireless communication described above, and wireless communication can also be performed without contactless power transmission when the remaining battery level is sufficient.

  The communication processing unit 21 performs communication control for communicating information on transmission conditions for contactless power transmission, power transmission / reception commands, and the like through inter-coil communication using the primary coil L1 and the secondary coil L2. Inter-coil communication from the power transmission side to the power reception side can be performed by frequency modulation, and inter-coil communication from the power reception side to the power transmission side can be performed 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 power receiving side detects data “1” and “0” by detecting this change in frequency. Thereby, coil communication by frequency modulation from the power transmission side to the power reception side is realized.

  On the other hand, the power receiving side changes the signal waveform of the induced voltage of the primary coil L1 as shown in FIG. 3B by changing the load on the power receiving side according to the data to be transmitted. 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. The power transmission side detects the change in the load state on the power reception side, thereby discriminating data “1” and “0”. Thereby, coil communication by load modulation from the power receiving side to the power transmission side is realized.

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

  Further, the communication processing unit 21 performs communication control for communicating wireless setting information for performing wireless communication between the power transmission side wireless communication unit 70 and the power receiving side wireless communication unit 80 by the inter-coil communication. Specifically, the communication processing unit 21 performs processing for receiving wireless setting request information from the power receiving device 40. When receiving the wireless setting request information, the communication processing unit 21 performs processing for transmitting the wireless setting information to the power receiving device 40. Do.

  The wireless setting information includes, for example, authentication information and security information necessary for wireless connection such as wireless LAN and Bluetooth (registered trademark). Specifically, for example, an SSID (Service Set Identifier), a MAC address, an encryption key (WEP key, etc.) required for setting a wireless LAN, and a pass key (PIN) required for Bluetooth (registered trademark) setting (pairing) Etc. are included.

  By doing in this way, the initial setting when performing wireless communication such as wireless LAN and Bluetooth (registered trademark) is performed by the above-described inter-coil communication, so the setting manually performed by the conventional user is not necessary. . That is, the user can easily establish a wireless connection simply by placing (approaching) the portable device (the electronic device on the power receiving side) on the power transmission device 10 (such as a charging stand). Further, since the communication distance between the coils is extremely short (for example, about several centimeters), there is little risk that the wireless setting information is intercepted by others.

  The removal detection unit 22 detects removal of the power receiving device 40. Specifically, removal of the power receiving device 40 (power-receiving-side electronic device) is detected by detecting a change in the waveform of the induced voltage signal (coil end signal) of the primary coil L1.

  When the removal detection unit 22 detects removal of the power receiving device 40, the wireless connection setting unit 23 sets wireless communication between the power transmission side wireless communication unit 70 and the power reception side wireless communication unit 80 to a disconnected state. Specifically, the wireless connection setting unit 23 turns off the power supply to the power transmission side wireless communication unit 70 or changes the wireless setting information so that the power transmission side wireless communication unit 70 and the power reception side wireless communication are changed. The wireless communication with the unit 80 is set to a non-connected state. In this way, when the portable device (the electronic device on the power receiving side) is removed from the power transmission device 10 (such as the charging stand), the wireless communication can be disconnected. In this way, when the mobile device (the electronic device on the power receiving side) is removed, by making wireless communication in a disconnected state, unauthorized access such as impersonation by other mobile devices can be suppressed.

  The storage unit 24 stores various types of information, and can be realized by, for example, a RAM, a D flip-flop, or a nonvolatile memory such as a flash memory or a mask ROM. The wireless setting information and the authentication information are stored in the storage unit 24.

  The power reception device 40 (power reception module, secondary module) of the present embodiment includes a secondary coil L2, a power reception unit 42, a power supply control unit 48, and a power reception control device 50. Note that the power reception device 40 and the power reception control device 50 of the present embodiment are not limited to the configuration in FIG. 2, and some of the components are omitted, replaced with other components, or other components are added. Various modifications such as these are possible.

  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 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) 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 60, a communication processing unit 51, a wireless connection setting unit 53, and a storage unit 54.

  The control unit 60 controls the power reception device 40 and the power reception control device 50. The control unit 60 can be realized by, for example, an ASIC circuit such as a gate array, or by a microcomputer and a program that operates on the microcomputer. The control unit 60 controls the power supply control unit 48, controls the communication processing unit 51 and the wireless connection setting unit 53, and performs storage control of the storage unit 54. Specifically, various sequence controls and determination processes necessary for power transmission, communication of wireless setting information for wireless connection, connection / disconnection of wireless communication, and the like are performed.

  In addition, the control unit 60 supplies power by contactless power transmission using the primary coil L1 and the secondary coil L2 during a period in which wireless communication is performed between the power transmission side wireless communication unit 70 and the power reception side wireless communication unit 80. Control is performed to receive power and supply it to the load 90.

  The power-receiving-side communication processing unit 51 uses the primary coil L1 and the secondary coil L2 as the wireless setting information for performing wireless communication between the power-transmitting-side wireless communication unit 70 and the power-receiving-side wireless communication unit 80. Communication control for communication by inter-communication is performed. Specifically, the communication processing unit 51 on the power receiving side performs processing for transmitting wireless setting request information to the power transmission device 10 and processing for receiving wireless setting information from the power transmission device 10. In addition, the communication processing unit 51 performs processing for transmitting authentication information to the power transmission device 10. The wireless setting information includes, for example, authentication information and security information necessary for wireless connection such as wireless LAN and Bluetooth (registered trademark).

  By doing in this way, the initial setting when performing wireless communication such as wireless LAN and Bluetooth (registered trademark) is performed by the above-described inter-coil communication, so the setting manually performed by the conventional user is not necessary. . That is, the user can easily establish a wireless connection simply by placing the portable device (the electronic device on the power receiving side) on the power transmission device 10 (such as a charging stand). Further, since the communication distance between the coils is extremely short (for example, about several centimeters), there is little risk that the wireless setting information is intercepted by others.

  The wireless connection setting unit 53 on the power reception side sets wireless communication between the power transmission side wireless communication unit 70 and the power reception side wireless communication unit 80 to a non-connected state when the contactless power transmission is stopped. Specifically, the wireless connection setting unit 53 turns off the power supply to the power receiving side wireless communication unit 80 or changes (or deletes) the wireless setting information stored in the storage unit 54. The wireless communication between the power transmission side wireless communication unit 70 and the power reception side wireless communication unit 80 is set to a disconnected state.

  In this way, when the portable device (the electronic device on the power receiving side) is removed from the power transmission device 10 (such as the charging stand), the wireless communication can be disconnected. In this way, when the mobile device (the electronic device on the power receiving side) is removed, by making wireless communication in a disconnected state, unauthorized access such as impersonation by other mobile devices can be suppressed.

  The storage unit 54 stores various types of information, and can be realized by, for example, a RAM, a D flip-flop, or a nonvolatile memory such as a flash memory or a mask ROM. The wireless setting information received from the power transmission device 10 is stored in the storage unit 54.

  Further, in the present embodiment, the power transmission side control unit 30 includes a negotiation processing unit 31, a setup processing unit 32, and a command processing unit 33. Further, the control unit 60 on the power receiving side also includes a negotiation processing unit 61, a setup processing unit 62, and a command processing unit 63. The command processing units 33 and 63 may not be provided.

  The negotiation processing units 31 and 61 perform a contactless power transmission negotiation process. That is, information about basic settings (standard, coil, system, safety function, etc.) of contactless power transmission is exchanged between the power transmission side and the power reception side. Then, the setup processing units 32 and 62 perform contactless power transmission setup processing based on the result of the negotiation processing. In other words, after the basic setting of contactless power transmission is performed by the negotiation process, different setup information is exchanged for each device and application between the power transmission side and the power reception side. Then, the command processing units 33 and 63 perform contactless power transmission command processing after the setup processing. In other words, basic commands and commands that can be handled by the setup process are issued and executed. In addition, normal power transmission may be started after the setup process without passing through the command process. For example, normal power transmission may be started after the setup process even if no explicit command is issued.

  Specifically, the negotiation processing units 31 and 61 check whether information can be communicated between the power transmission device 10 and the power receiving device 40, check whether the communicated information is valid, Confirmation process of whether or not the load state on the side is appropriate.

  More specifically, the negotiation processing units 31 and 61 perform verification processing of standard information, coil information, and system information indicating a load state detection method between the power transmission device 10 and the power reception device 40. That is, the standard / coil / system information received from the power receiving side is collated with the standard / coil / system information on the power transmission side to check whether the standard / coil / system is compatible (matched).

  As described above, the negotiation process in the present embodiment includes a confirmation process as to whether or not information communication is possible between the power transmission apparatus and the power reception apparatus, a confirmation process as to whether or not the communicated information is valid, and a load state on the power reception apparatus side. Such as confirmation processing of whether the power is appropriate, verification processing of standard information or coil information between the power transmission device and the power reception device, and verification processing of the system information of the power transmission device and the system information of the power reception device indicating the load state detection method, etc. At least one.

  The setup processing units 32 and 62 perform contactless power transmission setup processing based on the result of the negotiation processing. Specifically, when the power receiving device 40 transmits transmission condition information for contactless power transmission, the transmission condition information is received and the transmission condition for contactless power transmission is set. That is, when the power receiving device 40 transmits transmission condition information necessary for normal power transmission such as a coil driving voltage and a driving frequency, transmission conditions such as a driving voltage and a driving frequency are set based on the transmission condition information. In addition, different setup information is exchanged with the power receiving apparatus 40 for each device or application. In addition, the setup processing units 32 and 62 exchange information on whether or not to perform wireless communication between the power transmission side wireless communication unit 70 and the power reception side wireless communication unit 80 in the setup process.

  As described above, the setup process in the present embodiment is at least one of a process for setting power transmission conditions based on the result of the negotiation process and a process for exchanging information about the corresponding function between the power transmitting apparatus and the power receiving apparatus. is there.

  The command processing units 33 and 63 perform contactless power transmission command processing after the setup processing. In other words, basic commands and commands that can be handled by the setup process are issued and executed. Specifically, for example, various commands such as a normal power transmission start command, a full charge detection command (full charge notification command) for the battery 94, and a recharge confirmation command for the battery 94 are processed. The command processing in the present embodiment is processing for performing at least one of command issuance and command execution that has been confirmed to be compatible by at least one of negotiation processing and setup processing.

  In addition, when the command processing unit 33 on the power transmission side receives a wireless setting request command as the wireless setting request information from the power receiving device 40, the command processing unit 33 performs wireless setting processing including wireless setting information transmission processing. On the other hand, the command processing unit 63 on the power receiving side performs a process of issuing a wireless setting request command to the power transmitting apparatus 10 as wireless setting request information.

  In this way, wireless settings can be made by using each process for contactless power transmission (negotiation processing, setup processing, command processing) without providing a special control unit for wireless setting processing. Processing can be performed efficiently.

  The setup processing unit 32 may perform the wireless setting information transmission process in the setup process without the command processing unit 33 performing the wireless setting process including the wireless setting information transmission process.

  As described above, according to the power transmission device and the power reception device of this embodiment, the wireless setting process can be efficiently performed using each process for contactless power transmission. As a result, wireless connection settings such as wireless LAN and Bluetooth (registered trademark) that have been performed manually by users can be performed simply by placing a portable device (power-receiving electronic device) on a power transmission device (such as a charging stand). Become. Further, since wireless communication can be performed while supplying power by contactless power transmission, the battery of the portable device can be prevented from being consumed by wireless communication, and wireless communication can be performed without worrying about the remaining battery level.

3. Processing Sequence of Contactless Power Transmission and Wireless Connection FIG. 4 schematically shows a processing sequence of contactless power transmission and wireless connection realized by this embodiment.

  In this processing sequence, after the reset state, the process proceeds to the standby phase. Here, in the reset state, various flags held by the power transmission side (primary) and the power reception side (secondary) are cleared. Here, the flag represents the state of the power transmission device 10 or the power reception device 40 (power transmission state, full charge state, recharge confirmation state, etc.), and is held in the storage units (registers) 24 and 54 of these devices. .

  In the standby phase, the power transmission side (primary) holds the final state when the power reception side (secondary) is stopped (when power transmission is stopped). For example, when full charge of the battery is detected, the power transmission side and the power reception side shift to a standby phase after full charge detection.

  The power transmission side and the power reception side shift to the negotiation phase after the standby phase. In this negotiation phase, a negotiation process is performed in which standard / coil / system matching is confirmed, safety information is exchanged, and the like.

  The power transmission side and the power reception side shift to the setup phase after the negotiation phase. In this setup phase, transmission conditions necessary for normal power transmission are set. Specifically, for example, the driving voltage and driving frequency of the coil are set. Further, in the command phase, information exchange regarding additional command functions such as the types of commands that can be issued / executed by the power transmission side and the power reception side and the periodic authentication function is executed in this setup process. This makes it possible to exchange different setting information according to the application such as the type of electronic device (mobile phone, audio device, etc.) and model.

  For wireless connection, information such as what kind of wireless communication is possible, what kind of wireless setting information is necessary, and the like is exchanged. Specifically, for example, whether the wireless communication means included in the mobile device (power-receiving-side electronic device) is a wireless LAN or Bluetooth (registered trademark), and what authentication method and encryption method are possible Information such as whether or not is exchanged.

  The power transmission side and the power reception side shift to the command phase after the setup phase. In this command phase, command processing is performed based on information obtained by the setup processing. In the command phase, a command branch is first performed. That is, command determination is performed and the process branches to command processing according to various flags. For example, the process branches to command processing related to contactless power transmission, command processing related to wireless connection, and other command processing.

  As commands related to contactless power transmission, for example, a normal power transmission (charge) start command, a full charge detection (notification) command, a recharge confirmation command, a power reception side interrupt command, a power transmission stop request command, and the like can be considered. As commands related to wireless connection, for example, a wireless setting request command, a wireless setting information generation command, a wireless setting information transmission (reception) command, a wireless communication start command, a wireless communication non-connection command, and the like can be considered.

  For example, for contactless power transmission, preparation for normal power transmission is completed by negotiation processing and setup processing, the power transmission side sends (issues) a normal power transmission (charging) start command to the power receiving side, and the power receiving side that receives it sends a response command When transmitting to the power transmission side, normal power transmission is started. When full charge is detected on the power receiving side after the start of normal power transmission, the power receiving side transmits a full charge detection command to the power transmission side. When it is not necessary to continue transmission as in this full charge detection, the process proceeds to a standby phase after full charge detection.

  For example, for wireless connection, after the wireless setting information can be exchanged according to the wireless communication means possible by the setup process, when the power receiving side transmits a wireless setting request command to the power transmitting side, A wireless setting information generation command is executed. The generated wireless setting information is transmitted to the power receiving side by a wireless setting information transmission command executed by the power transmitting side. The power receiving side stores the received wireless setting information in the storage unit 54 and sets the power receiving side wireless communication unit 80 based on the wireless setting information. Then, when the power transmission side or the power reception side issues a wireless communication start command, wireless communication is started.

  When the power transmission side completes wireless communication, or when it is detected that the portable device (power receiving side electronic device) has been removed from the power transmission device 10 (charging stand), the power transmission side executes a wireless communication disconnection command. To set the wireless communication to the disconnected state. Alternatively, when the mobile device (power-receiving-side electronic device) side completes wireless communication or detects that power reception has stopped, a wireless communication disconnection command is executed to set wireless communication to a disconnected state. You can also.

  Specifically, when the power transmission side removal detection unit 22 detects the removal of the power receiving device 40, the power transmission side wireless connection setting unit 23 turns off the power supply to the power transmission side wireless communication unit 70. Alternatively, the wireless communication is set to a non-connected state by changing the wireless setting information. Further, when the non-contact power transmission stops, the wireless connection setting unit 53 on the power receiving side turns off the power supply to the power receiving side wireless communication unit 80 or the wireless setting stored in the storage unit 54 By changing (or deleting) the information, the wireless communication is set to a disconnected state. In this way, when the mobile device (the electronic device on the power receiving side) is removed, by making wireless communication in a disconnected state, unauthorized access such as impersonation by other mobile devices can be suppressed.

  The processing sequence of this embodiment will be described more specifically with reference to FIG. In the standby phase after the removal detection indicated by F1, for example, landing detection is performed once every k1 seconds. When the landing (installation) of the electronic device is detected as indicated by F2, negotiation processing and setup processing are executed. Then, as shown in F3, when the negotiation process and the setup process are normally completed and a normal power transmission start command is issued in the command process, normal power transmission is started, and charging of the electronic device is started. When a wireless communication start command is issued, wireless communication between the power transmission side and the power reception side is started.

  When full charge is detected as indicated by F4, the LED of the electronic device is turned off, and the process proceeds to a standby phase after detection of full charge as indicated by F5. Even in the case of transition to the standby phase after full charge detection, wireless communication is continued. In the standby phase after full charge detection, for example, removal detection is performed once every k3 seconds and recharge confirmation is performed once every k3 × j seconds.

  When the removal of the electronic device is detected in the standby phase after the detection of full charge as indicated by F6, the process proceeds to the standby phase after the detection of removal. In the standby phase after the removal detection, the wireless communication is set to a non-connected state. On the other hand, in the standby phase after full charge detection, if it is determined that recharging is necessary by recharging confirmation as shown in F7, negotiation processing and setup processing are performed, normal power transmission is resumed, Recharging is performed. If removal of an electronic device is detected during normal power transmission as indicated by F8, the process proceeds to a standby phase after removal detection.

  FIG. 6A shows a format example of a negotiation frame transferred in the negotiation process. This negotiation frame has a head field, an information field, and a final field. The information field is composed of a match code and a hardware information code.

  FIG. 6B shows a format example of the matching code. The coincidence code includes a command ID, a standard code, an extension code, and a coil code. The command ID is an ID indicating a matching code. The standard code is a code representing the version of the standard. The extension code is a code representing an ID code system. For example, the code length is managed by an extended code management ledger or the like.

  The coil code is a code representing coil information, and is composed of, for example, a division code and a coil ID (coil identification information). The division code is used to designate an administrator of the coil ID. The coil ID is an ID given by the administrator to the primary coil (primary coil unit). That is, not only on the power transmission side but also on the power reception side, the ID of the primary coil on the power transmission side is given as the coil ID. The definition of the coil ID changes based on the extension code. For example, when the extension code is the first setting, the coil code is divided and set to the division code and the coil ID, and when the extension code is the second setting, the coil code is the division code and the coil ID. It is set without classification.

  FIG. 6C shows a format example of the hardware information code. The hardware information code includes a system code and a foreign object threshold value. The system code indicates system information. Specifically, the system code is information indicating a load state detection method on the power transmission side or the power reception side. Here, the load state detection method includes a pulse width detection method (phase detection method), a current detection method, a peak voltage detection method, or a combination of these methods. The system code is a code indicating which of these methods is adopted on the power transmission side or the power reception side.

  As described above, according to the processing sequence of the present embodiment, for example, determination of compatibility of standards / coils / systems and minimum information exchange for safety are performed in the negotiation processing.

  In the setup process, transmission conditions necessary for normal power transmission are set. For example, the driving voltage and driving frequency of the coil are set. As for wireless connection, information such as what kind of wireless communication is possible and what kind of wireless setting information is required is exchanged. Specifically, for example, information such as a wireless communication method, an authentication method, and an encryption method is exchanged.

  Then, after such negotiation process and setup process, the process proceeds to the command phase and the command process is performed. For example, command processing related to contactless power transmission, such as a normal power transmission (charge) start command, a full charge detection (notification) command, and a recharge confirmation command, is performed. Further, command processing related to wireless connection such as a wireless setting request command, a wireless setting information generation command, and a wireless communication start command is performed.

  In this way, wireless connection processing can be performed by using each processing (negotiation processing, setup processing, command processing) for contactless power transmission without providing a special processing unit for wireless connection processing. Can be performed efficiently.

  The command processing unit may perform the wireless setting information transmission process in the setup process without performing the wireless setting process including the wireless setting information transmission process.

4). Operations of Power Transmitting Device and Power Receiving Device Operations for wireless connection in the command phase will be described with reference to FIGS. 7 (A) to 8 (B).

  First, as illustrated in FIG. 7A, the power receiving device 40 transmits a wireless setting request command to the power transmitting device 10 during a period in which power transmission is performed. This transmission is performed by inter-coil communication using the primary coil L1 and the secondary coil L2. When receiving the wireless setting request command, the power transmission device 10 generates wireless setting information necessary for wireless connection. This wireless setting information includes, for example, authentication information and security information necessary for wireless connection such as wireless LAN and Bluetooth (registered trademark). Specifically, for example, an SSID (Service Set Identifier), a MAC address, an encryption key (WEP key, etc.) required for setting a wireless LAN, and a pass key (PIN) required for Bluetooth (registered trademark) setting (pairing) Etc. are included.

  Next, as illustrated in FIG. 7B, the power transmission device 10 transmits the generated wireless setting information to the power reception device 40. The power receiving device 40 stores the received wireless setting information in the storage unit 54 and sets the power receiving side wireless communication unit 80 based on the wireless setting information.

  Subsequently, as illustrated in FIG. 8A, wireless communication is started between the power transmission side wireless communication unit 70 and the power reception side wireless communication unit 80. During the wireless communication period, the power transmission device 10 can continue power transmission to the power reception device 40.

  8B, when the power transmission side completes wireless communication, or when the power transmission side removal detection unit 22 detects removal of the power receiving device 40, the power transmission side wireless connection setting unit 23 is wireless. Set communication to disconnected state. Further, when the power receiving side completes the wireless communication, or when the power receiving is stopped, the power receiving side wireless connection setting unit 53 sets the wireless communication to the non-connected state.

  As described above, according to the power transmission device and the power reception device of the present embodiment, wireless connection processing can be efficiently performed by using a command for wireless connection in the command phase.

  9 and 10 are examples of flowcharts of operations of the power transmission device and the power reception device of the present embodiment. As shown in FIG. 9, the operation starts from the standby phase (steps S1 and S21). In this standby phase, the power transmission side performs temporary power transmission, and whether or not the portable device (electronic device on the power receiving side) is placed on the power transmission device (charging base), and if so, whether it is placed in the proper position To detect.

  If the positional relationship is appropriate, the process proceeds to the negotiation phase (steps S2 and S22). In this phase, it is determined whether or not the standard information, coil information, and system information on the power transmission side and the power reception side match each other.

  If the standard / coil / system information matches, the process proceeds to the setup phase (step 3, S23). In this setup phase, transmission condition information, corresponding function information, information on the wireless system, and the like are exchanged.

  Next, the power transmission side and the power reception side move to a command branch (steps S4 and S24). That is, command determination is performed and the process branches to command processing according to various flags. Specifically, when there is no command that requires preferential processing (such as an interrupt command), the process proceeds to power transmission control (step S5) and power reception control (step S25).

  When performing the wireless connection process, the process proceeds to the transmission / reception of the wireless setting request command (steps S6 and S26) shown in FIG. 10 again through the command branch (steps S4 and S24) during the period in which the power transmission is performed. That is, the power receiving side transmits a wireless setting request command, and the power transmitting side that has received the command generates wireless setting information (step S7). The wireless setting information includes, for example, authentication information and security information necessary for wireless connection such as wireless LAN and Bluetooth (registered trademark).

  The generated wireless setting information is transferred to the power receiving side by the power setting side wireless setting information transmission command and the power receiving side wireless setting information reception command (steps S8 and S27). The power receiving side stores the received wireless setting information in the storage unit (step S28), and sets the wireless communication unit based on the wireless setting information (S29). Then, a wireless communication start command is issued and wireless communication is started (steps S9 and S30).

  When the power transmission side detects the removal of the portable device (power receiving side electronic device) (step S10) or when the wireless communication is completed (step S11), the power transmission side sets the wireless communication to the disconnected state (step S12). . When power reception is stopped (step S31) or when wireless communication is completed (step S32), the power receiving side sets the wireless communication to a disconnected state (step S33).

  As described above, according to the power transmission device and the power reception device of the present embodiment, each process (negotiation process, setup process) for contactless power transmission without providing a special processing unit for wireless connection processing. , Command processing), wireless connection processing can be performed efficiently.

  As a result, initial setting of wireless connection such as wireless LAN and Bluetooth (registered trademark), which has been manually performed by a user in the past, can be performed simply by placing the portable device on a power transmission device (such as a charging stand). Further, since wireless communication can be performed while supplying power by contactless power transmission, the battery of the portable device can be prevented from being consumed by wireless communication, and wireless communication can be performed without worrying about the remaining battery level.

  In addition, according to the power transmission device and the power reception device of the present embodiment, the wireless setting information is transmitted and received by inter-coil communication with a very short communication distance, so that there is little risk of being intercepted by others. Furthermore, when a portable device is removed from a power transmission device (such as a charging stand), the removal can be detected and wireless communication can be disconnected. As a result, unauthorized access such as impersonation by other portable devices can be suppressed.

  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 at least once together with a different term having a broader meaning or the same meaning in the specification or the drawings can be replaced with the different term in any part of the specification or the drawings. Further, the configurations and operations of the power transmission control device, the power transmission device, the power reception control device, the power reception device, and the electronic device are not limited to those described in the present embodiment, and various modifications can be made.

10 power transmission device, 12 power transmission unit, 20 power transmission control device, 21 communication processing unit,
22 removal detection unit, 23 wireless connection setting unit, 24 storage unit,
30 control unit (power transmission side), 31, 61 negotiation processing unit,
32, 62 Setup processing unit, 33, 63 Command processing unit, 40 Power receiving device,
42 power reception unit, 48 power supply control unit, 50 power reception control device, 51 communication processing unit,
53 wireless connection setting unit, 54 storage unit, 60 control unit (power receiving side),
70 wireless communication unit (power transmission side), 80 wireless communication unit (power reception side), 90 load,
94 battery, 500 charger, 502 AC adapter, 510 mobile phone,
512 display unit, 514 operation unit, 516 microphone, 518 speaker

Claims (19)

A control unit that performs control for transmitting power to the power receiving device using the primary coil and the secondary coil by contactless power transmission;
Performs communication control for communicating wireless setting information for performing wireless communication between the power transmission side wireless communication unit and the power reception side wireless communication unit by inter-coil communication using the primary coil and the secondary coil. A communication processing unit;
A power transmission control device comprising: In claim 1,
The control unit transmits power by the contactless power transmission using the primary coil and the secondary coil during a period in which wireless communication is performed between the power transmission side wireless communication unit and the power reception side wireless communication unit. The power transmission control device characterized by performing control to perform. In claim 1 or 2,
The communication processing unit performs processing for receiving wireless setting request information from the power receiving device, and performs processing for transmitting the wireless setting information to the power receiving device when the wireless setting request information is received. A power transmission control device. In any one of Claims 1 thru | or 3,
A removal detection unit for detecting removal of the power receiving device;
A wireless connection setting unit configured to set wireless communication between the power transmission side wireless communication unit and the power reception side wireless communication unit to a non-connected state when the removal detection unit detects removal of the power receiving device; A power transmission control device. In claim 4,
The wireless connection setting unit
The wireless communication between the power transmission side wireless communication unit and the power reception side wireless communication unit is disconnected by turning off the power supply to the power transmission side wireless communication unit or by changing the wireless setting information. A power transmission control device that is set to a state. In any one of Claims 1 thru | or 5,
The controller is
Based on the result of the authentication process based on the authentication information from the power receiving device, whether to allow power transmission to the power receiving device, and wireless communication between the power transmitting side wireless communication unit and the power receiving side wireless communication unit A power transmission control device that determines whether or not to permit the power transmission. In any one of Claims 1 thru | or 6.
The controller is
A negotiation processing unit for performing negotiation processing of the contactless power transmission;
A setup processing unit that performs setup processing of the non-contact power transmission based on a result of the negotiation processing,
In the setup process, the setup processing unit performs information exchange as to whether or not to perform wireless communication between the power transmission side wireless communication unit and the power reception side wireless communication unit. In claim 7,
The controller is
A command processing unit for performing command processing of the contactless power transmission after the setup processing;
When the command processing unit receives a wireless setting request command as wireless setting request information from the power receiving device, the command processing unit performs wireless setting processing including transmission processing of the wireless setting information. In claim 7,
The power transmission control device, wherein the setup processing unit performs a transmission process of the wireless setting information in the setup process. A power transmission control device according to any one of claims 1 to 9,
And a power transmission unit that generates an AC voltage and supplies the AC voltage to the primary coil. A power transmission device according to claim 10;
An electronic apparatus comprising: the power transmission side wireless communication unit. A control unit that performs control for receiving power from the power transmission device using the primary coil and the secondary coil by non-contact power transmission;
Performs communication control for communicating wireless setting information for performing wireless communication between the power transmission side wireless communication unit and the power reception side wireless communication unit by inter-coil communication using the primary coil and the secondary coil. A communication processing unit;
A power reception control device comprising: In claim 12,
The control unit receives power by the contactless power transmission using the primary coil and the secondary coil during a period of wireless communication between the power transmission side wireless communication unit and the power reception side wireless communication unit. A power reception control device characterized by performing control to perform. In claim 12 or 13,
The power reception control device, wherein the communication processing unit performs processing for transmitting wireless setting request information to the power transmission device, and performs processing for receiving the wireless setting information from the power transmission device. In any of claims 12 to 14,
A power reception control comprising: a wireless connection setting unit configured to set wireless communication between the power transmission side wireless communication unit and the power reception side wireless communication unit to a non-connected state when the contactless power transmission is stopped apparatus. In claim 15,
The wireless connection setting unit
Wireless communication between the power transmission side wireless communication unit and the power reception side wireless communication unit is disconnected by turning off the power supply to the power receiving side wireless communication unit or by changing the wireless setting information. A power reception control device that is set to a state. In any of claims 12 to 16,
The controller is
A negotiation processing unit for performing negotiation processing of the contactless power transmission;
A setup processing unit that performs setup processing of the non-contact power transmission based on a result of the negotiation processing,
In the setup process, the setup processing unit exchanges information as to whether or not to perform wireless communication between the power transmission side wireless communication unit and the power reception side wireless communication unit. A power reception control device according to any one of claims 12 to 17,
And a power receiving unit that converts an induced voltage of the secondary coil into a DC voltage. The power receiving device according to claim 18;
An electronic apparatus comprising: the power receiving side wireless communication unit.

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