Method and apparatus for data communication reset and forced termination (ABORT) in a wireless power transmission system

Abstract

The present disclosure provides a method of transferring wireless power performed by a wireless power transmitter in a wireless power transmission system, characterized in that the method includes entering a power transfer phase related to transferring the wireless power and transferring a first data stream to the wireless power receiver during the power transfer phase, the wireless power transmitter transmitting reset information to the wireless power receiver indicating a reset of the first data stream, the wireless power transmitter receiving a response to the reset information from the wireless power receiver, and the wireless power transmitter performing a reset of the first data stream based on receiving the response, and an apparatus using the same.

Description

Technical Field

[0001] This specification relates to wireless power transmission.

Background Art

[0002] Wireless power transmission technology is a technology for wirelessly transmitting power between a power source and an electronic device. As an example, wireless power transmission technology enables the battery of a wireless terminal to be charged simply by placing the wireless terminal, such as a smartphone or a tablet, on a wireless charging pad, providing greater mobility, convenience, and safety compared to a wired charging environment that uses an existing wired charging connector. In addition to wireless charging of wireless terminals, wireless power transmission technology has attracted attention for replacing the existing wired power transmission environment in various fields such as electric vehicles, various wearable devices such as Bluetooth earphones and 3D glasses, household appliances, furniture, underground facilities, buildings, medical devices, robots, and leisure.

[0003] The wireless power transmission method is also referred to as a non-contact power transmission method or a non-contact power transmission method, or a wireless charging method. A wireless power transmission system can be composed of a wireless power transmission device that supplies electrical energy to the wireless power transmission method, and a wireless power reception device that receives the electrical energy wirelessly supplied from the wireless power transmission device and supplies power to a power reception device such as a battery cell.

[0004] Wireless power transmission technologies are diverse, including methods of transmitting power via magnetic coupling, radio frequency (RF), microwave, ultrasonic waves, etc. Also, the methods based on magnetic coupling are classified into magnetic induction and magnetic resonance methods. The magnetic induction method is a way of transmitting energy by utilizing the current induced in the receiving coil by the magnetic field generated in the transmitting coil battery cell through electromagnetic coupling between the transmitting coil and the receiving coil. The magnetic resonance method is similar to the magnetic induction method in that it uses a magnetic field. However, the magnetic resonance method is different from magnetic induction in that resonance occurs when a specific resonance frequency is applied to the transmitting and receiving coils, and energy is transmitted due to the phenomenon of magnetic field concentration at both ends of the transmitting and receiving sides.

[0005] On the other hand, it is intended to provide a method for data communication reset and forced termination (Abort) in a wireless power transmission system and an apparatus using the same.

Summary of the Invention

Means for Solving the Problems

[0006] According to an embodiment of the present specification, a wireless power transmitter transmits reset information notifying a reset of a first data stream to a wireless power receiver, the wireless power transmitter receives a response to the reset information from the wireless power receiver, and the wireless power transmitter executes a reset of the first data stream based on receiving the response. A method and an apparatus characterized by this can be provided.

Advantages of the Invention

[0007] According to this specification, the efficiency of the data transport stream is improved, and stable data communication is possible. Also, according to this specification, even when the memory for data communication and storage is stuck and no further recovery is possible, a configuration is provided to execute a reset while maintaining the corresponding application stream in an open state, so that the radio power transmitter and the radio power receiver can immediately execute data communication. Also, according to this specification, even when data communication and storage are stuck and no further recovery is possible, an effect of starting new data communication based on forced termination can occur.

[0008] The effects obtained by a specific example of this specification are not limited to the effects listed above. For example, there may be various technical effects that a person having ordinary skill in the related art can understand or derive from this specification. Accordingly, the specific effects of this specification are not limited to those explicitly described in this specification, and can include various effects that can be understood or derived from the technical features of this specification.

Brief Description of the Drawings

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DETAILED DESCRIPTION OF THE INVENTION

[0051] As used herein, "A or B" can mean "only A", "only B", or "both A and B". As another expression, "A or B" as used herein can be interpreted as "A and / or B". For example, "A, B or C" as used herein can mean "only A", "only B", "only C", or "any combination of A, B and C".

[0052] The slashes ( / ) and commas used in this specification can mean "and / or". For example, "A / B" can mean "A and / or B". Accordingly, "A / B" can mean "only A", "only B", or "both A and B". For example, "A, B, C" can mean "A, B or C".

[0053] As used herein, "at least one of A and B" can mean "only A", "only B", or "both A and B". Also, the expressions "at least one of A or B" and "at least one of A and / or B" as used herein can be interpreted in the same way as "at least one of A and B".

[0054] Also, in this specification, "at least one of A, B, and C" can mean "only A", "only B", "only C", or "any combination of A, B, and C". Also, "at least one of A, B, or C" and "at least one of A, B, and / or C" can mean "at least one of A, B, and C".

[0055] Also, the parentheses used in this specification can mean "for example". Specifically, when expressed as "control information (PDCCH)", "PDCCH" is proposed as an example of "control information". As another expression, the "control information" in this specification is not limited to "PDCCH", and "PDDCH" is proposed as an example of "control information". Also, when expressed as "control information (i.e., PDCCH)", "PDCCH" is proposed as an example of "control information".

[0056] In this specification, the technical features individually described within one drawing can be embodied individually or simultaneously. The term "wireless power" as used hereinafter is used to mean any form of energy related to electric fields, magnetic fields, electromagnetic fields, etc. that are transmitted from a wireless power transmitter to a wireless power receiver without the use of a physical electrical conductor. Wireless power is also referred to as a wireless power signal and can mean an oscillating magnetic flux enclosed by a primary coil and a secondary coil. For example, power conversion in a system is described herein for wirelessly charging devices including mobile phones, cordless phones, iPods, MP3 players, headsets, etc. Generally, the basic principles of wireless power transmission include, for example, all methods of transmitting power through magnetic coupling, through radio frequency (RF), through microwave, and through ultrasonic waves.

[0057] FIG. 1 is a block diagram of a wireless power system 10 according to an embodiment.

[0058] Referring to FIG. 1, the wireless power system 10 includes a wireless power transmitter 100 and a wireless power receiver 200.

[0059] The wireless power transmitter 100 receives power application from an external power source (S) and generates a magnetic field. The wireless power receiver 200 receives wireless power by generating a current using the generated magnetic field.

[0060] Also, in the wireless power system 10, the wireless power transmitter 100 and the wireless power receiver 200 can transmit and receive various information necessary for wireless power transmission. Here, the communication between the wireless power transmitter 100 and the wireless power receiver 200 can be executed by either in-band communication that uses the magnetic field utilized for wireless power transmission or out-band communication that uses a separate communication carrier. Out-band communication is also called out-of-band communication. Hereinafter, it will be uniformly described using the term out-band communication. Examples of out-band communication can include NFC, Bluetooth, BLE (Bluetooth Low Energy), and the like.

[0061] Here, the wireless power transmitter 100 can be provided in a fixed type or a mobile type. Examples of the fixed type include a form embedded in furniture such as an indoor ceiling, wall surface, or table, a form implanted in an outdoor parking lot, bus stop, subway station, etc., and a form installed in a means of transportation such as a vehicle or a train. The wireless power transmitter 100 that is mobile can be embodied as a part of another device, such as a mobile device with a movable weight and size or a cover of a notebook computer.

[0062] In addition, the wireless power receiving device 200 should be interpreted as a comprehensive concept including various household electrical appliances that are driven by receiving power wirelessly instead of various electronic devices equipped with a battery and a power cable. Representative examples of the wireless power receiving device 200 include a portable terminal, a cellular phone, a smart phone, a personal digital assistant (PDA), a portable media player (PMP), a Wibro terminal, a tablet, a phablet, a notebook, a digital camera, a navigation terminal, a television, an electronic vehicle (EV), and the like.

[0063] FIG. 2 is a block diagram of a wireless power system 10 according to another embodiment.

[0064] Referring to FIG. 2, in the wireless power system 10, the number of wireless power receiving devices 200 is one or more. In FIG. 1, it is shown that the wireless power transmitting device 100 and the wireless power receiving device 200 exchange power on a one-to-one basis. However, as shown in FIG. 2, it is also possible for one wireless power transmitting device 100 to transmit power to a plurality of wireless power receiving devices 200-1, 200-2,..., 200-M. In particular, when performing wireless power transmission by the magnetic resonance method, one wireless power transmitting device 100 can transmit power to a plurality of wireless power receiving devices 200-1, 200-2,..., 200-M simultaneously by applying a simultaneous transmission method or a time-division transmission method.

[0065] In addition, although FIG. 1 shows a method in which the wireless power transmission device 100 directly transmits power to the wireless power reception device 200, there may be a case where a separate wireless power transmission / reception device such as a relay or a repeater is provided between the wireless power transmission device 100 and the wireless power reception device 200 to increase the wireless power transmission distance. In this case, power is transmitted from the wireless power transmission device 100 to the wireless power transmission / reception device, and the wireless power transmission / reception device can transmit power to the wireless power reception device 200 again.

[0066] Hereinafter, the wireless power receiver, power receiver, and receiver mentioned in this specification refer to the wireless power reception device 200. Also, the wireless power transmitter, power transmitter, and transmitter mentioned in this specification refer to the wireless power reception transmission device 100.

[0067] FIG. 3 shows examples of various electronic devices in which a wireless power transmission system is introduced.

[0068] FIG. 3 classifies and shows electronic devices according to the amount of power transmitted and received in the wireless power transmission system. Referring to FIG. 3, a wireless charging method with low power (about 5W or less or about 20W or less) can be applied to wearable devices such as smart watches, smart glasses, head-mounted displays (HMDs), and smart rings, as well as mobile electronic devices (or portable electronic devices) such as earphones, remote controls, smart phones, PDAs, and tablet PCs.

[0069] For medium / small home appliances such as notebooks, robot cleaners, TVs, audio devices, cleaners, and monitors, a wireless charging method with medium power (about 50W or less or about 200W or less) can be applied. For kitchen home appliances such as mixers, microwave ovens, and electric rice cookers, and personal mobility devices (or electronic devices / mobility means) such as wheelchairs, electric kick scooters, electric bicycles, and electric vehicles, a wireless charging method with high power (about 2kW or less or 22kW or less) can be applied.

[0070] The above-described (or shown in FIG. 1) electronic device / mobile means can each include a wireless power receiver described later. Therefore, the above-described electronic device / mobile means can be wirelessly charged by receiving power from a wireless power transmitter.

[0071] In the following, a description will be centered on mobile devices to which a wireless power charging method is applied, but this is merely an example, and the wireless charging method according to this specification can be applied to the various electronic devices described above.

[0072] Standards for wireless power transmission include WPC (Wireless Power Consortium), AFA (Air Fuel Alliance), and PMA (Power Matters Alliance).

[0073] The WPC standard defines a Baseline Power Profile (BPP) and an Extended Power Profile (EPP). BPP relates to wireless power transmission and reception devices that support 5W power transmission, and EPP relates to wireless power transmission and reception devices that support power transmission in a range greater than 5W and less than 30W.

[0074] Various wireless power transmission and reception devices using different power levels are covered for each standard and can be classified into different power classes or categories.

[0075] For example, WPC classifies wireless power transmission and reception devices into Power Class (PC)-1, PC0, PC1, and PC2 and provides standard documents for each PC. The PC-1 standard relates to wireless power transmission and reception devices that provide guaranteed power of less than 5W. Applications of PC-1 include wearable devices such as smartwatches.

[0076] The PC0 standard relates to wireless power transmission and reception devices that provide guaranteed power of 5W. The PC0 standard includes EPP where the guaranteed power is up to 30W. In-band (IB) communication is the mandatory communication protocol of PC0, and out-of-band (OB) communication, which is used as an optional backup channel, can also be used. The wireless power reception device can be identified by setting the OB flag in the configuration packet to indicate whether OB is supported. The wireless power transmission device that supports OB can enter the OB handover phase by transmitting a bit-pattern for OB handover as a response to the configuration packet. The response to the configuration packet is NAK, ND, or a newly defined 8-bit pattern. The applications of PC0 include smartphones.

[0077] The PC1 standard relates to wireless power transmission and reception devices that provide guaranteed power from 30W to 150W. OB is the mandatory communication channel for PC1, and IB is used for the initialization and link establishment to OB. The wireless power transmission device can enter the OB handover phase by using the bit-pattern for OB handover as a response to the configuration packet. The applications of PC1 include laptops and power tools.

[0078] The PC2 standard relates to wireless power transmission and reception devices that provide guaranteed power from 200W to 2kW, and its applications include kitchen appliances.

[0079] In this way, the PCs can be distinguished by power levels, and whether to support compatibility between the same PCs is a matter of choice or requirement. Here, compatibility between the same PCs means that power can be transmitted and received between the same PCs. For example, if a wireless power transmitting device that is PCx can charge a wireless power receiving device that has the same PCx, it can be determined that compatibility between the same PCs is maintained. Similarly, compatibility between different PCs can also be supported. Here, compatibility between different PCs means that power can be transmitted and received between different PCs. For example, if a wireless power transmitting device that is PCx can charge a wireless power receiving device that has PCy, it can be determined that compatibility between different PCs is maintained.

[0080] Support for compatibility between PCs is a rather important issue in terms of user experience and infrastructure construction. However, there are a number of technical problems as follows in maintaining compatibility between PCs.

[0081] In the case of compatibility between the same PCs, for example, a wireless power receiving device with a lap-top charging method that can be stably charged only when power is continuously transmitted, even if it is a wireless power transmitting device of the same PC, there is a problem when stably receiving power from a wireless power transmitting device of a power tool method that transmits power discontinuously. Also, in the case of compatibility between different PCs, for example, when a wireless power transmitting device with a minimum guaranteed power of 200W transmits power to a wireless power receiving device with a maximum guaranteed power of 5W, there is a risk that the wireless power receiving device will be damaged by overvoltage. As a result, it is difficult for a PC to define an indicator / criterion representing / indicating compatibility.

[0082] The wireless power transmission and reception device can provide a quite convenient user experience and interface (UX / UI). That is, a smart wireless charging service can be provided. The smart wireless charging service can be implemented based on the UX / UI of a smartphone including a wireless power transmission device. For such an application, the interface between the processor of the smartphone and the wireless charging reception device allows "drop and play" two-way communication between the wireless power transmission device and the reception device.

[0083] As an example, a user can experience the smart wireless charging service in a hotel. When the user enters the hotel room and places the smartphone on the room's wireless charger, the wireless charger transmits wireless power to the smartphone, and the smartphone receives the wireless power. In this process, the wireless charger transmits information about the smart wireless charging service to the smartphone. When the smartphone detects that it is located on the wireless charger, or detects the reception of wireless power, or the smartphone receives information about the smart wireless charging service from the wireless charger, the smartphone enters a state of asking the user for opt-in to additional features. For this purpose, the smartphone can display a message on the screen in a way that may or may not include an alarm. An example of the message can include text such as "Welcome to hotel. Select 'Yes' to activate smart charging functions: Yes|No Thanks." The smartphone receives the user's input of selecting Yes or No Thanks and executes the next procedure selected by the user. If Yes is selected, the smartphone transmits the corresponding information to the wireless charger. Then, the smartphone and the wireless charger execute the smart charging function together.

[0084] Also, the smart wireless charging service can include those that receive auto-filled WiFi credentials. For example, the wireless charger transmits the WiFi credentials to the smartphone, and the smartphone automatically inputs the WiFi credentials received from the wireless charger by running an appropriate APP.

[0085] Also, the smart wireless charging service can include running a hotel application that provides hotel promotions, or those that obtain remote check-in / check-out and contact information.

[0086] As another example, the user can experience the smart wireless charging service inside the vehicle. When the user gets into the vehicle and places the smartphone on the wireless charger, the wireless charger transmits wireless power to the smartphone, and the smartphone receives the wireless power. In such a process, the wireless charger transmits information about the smart wireless charging service to the smartphone. When the smartphone detects that it is located on the wireless charger, or detects the reception of wireless power, or receives information about the smart wireless charging service from the wireless charger, the smartphone enters a state of asking the user for identity confirmation.

[0087] In this state, the smartphone is automatically connected to the vehicle via WiFi and / or Bluetooth. The smartphone can display a message on the screen in a way that may or may not include an alarm. An example of the message can include text such as “Welcome to your car.Select ‘Yes’ to synch device with in-car controls:Yes|No Thanks.” The smartphone receives the user's input to select Yes or No Thanks and executes the next procedure selected by the user. If Yes is selected, the smartphone sends the relevant information to the wireless charger. Then, the smartphone and the wireless charger can jointly execute the smart control function within the vehicle by driving the application / display software within the vehicle. The user can enjoy the desired music and check the regular map position. The application / display software within the vehicle can include the performance of providing synchronization proximity for the passengers.

[0088] As another example, a user can experience smart wireless charging at home. When the user enters a room and places a smartphone on a wireless charger in the room, the wireless charger transmits wireless power to the smartphone, and the smartphone receives the wireless power. During this process, the wireless charger transmits information about the smart wireless charging service to the smartphone. When the smartphone detects that it is located on the wireless charger, or detects the reception of wireless power, or the smartphone receives information about the smart wireless charging service from the wireless charger, the smartphone enters a state of asking the user for opt-in to additional features. To that end, the smartphone can display a message on the screen in a way that includes or does not include an alarm. An example of the message can include text such as "Hi xxx, Would you like to activate night mode and secure the building?: Yes|No Thanks." The smartphone receives the user's input of selecting Yes or No Thanks and executes the next procedure selected by the user. If Yes is selected, the smartphone transmits the corresponding information to the wireless charger. The smartphone and the wireless charger can at least recognize the user's pattern and invite the user to lock the doors and windows, turn off the power, or set an alarm.

[0089] Hereinafter, a 'profile' is newly defined as an indicator / criterion representing / indicating compatibility. That is, compatibility is maintained between wireless power transmitting and receiving devices having the same 'profile', and it can be interpreted that power transmission and reception are not possible between wireless power transmitting and receiving devices having different 'profiles'. The profile can be defined by compatibility and / or applications regardless of (or independently of) the power class.

[0090] The profile can be broadly classified into three categories: i) mobile and computer, ii) power tools, and iii) kitchen.

[0091] Alternatively, the profiles can be broadly classified into four categories: i) mobile, ii) power tools, iii) kitchen, and iv) wearable.

[0092] In the case of the'mobile' profile, the PCs can be PC0 and / or PC1, the communication protocol / method can be IB and OB, the operating frequency can be defined as 87 - 205 kHz, and examples of applications can include smartphones, laptops, etc.

[0093] In the case of the 'power tools' profile, the PC can be PC1, the communication protocol / method can be IB, the operating frequency can be defined as 87 - 145 kHz, and examples of applications can include power tools.

[0094] In the case of the 'kitchen' profile, the PC can be PC2, the communication protocol / method can be NFC - based, the operating frequency can be defined as less than 100 kHz, and examples of applications can include kitchen / home appliances.

[0095] In the case of power tools and kitchen profiles, NFC communication can be used between the wireless power transmitter and the receiver. The wireless power transmitter and the receiver can confirm that they are NFC devices by exchanging WPC NDEF (NFC Data Exchange Profile Format).

[0096] Figure 4 is a block diagram of a wireless power transmission system according to an embodiment.

[0097] Referring to Figure 4, the wireless power transmission system 10 includes a mobile device 450 that receives power wirelessly and a base station 400 that transmits power wirelessly.

[0098] The base station 400 is a device that provides inductive power or resonant power, and can include at least one wireless power transmitter 100 and a system circuit 405. The wireless power transmitter 100 can transmit inductive power or resonant power and control the transmission. The wireless power transmitter 100 can include a power conversion circuit 110 that converts electrical energy into a power signal by generating a magnetic field through a primary coil(s), and a communications&control circuit 120 that controls communication and power transmission with the wireless power receiver 200 to transmit power at an appropriate level. The system circuit 405 can perform other operation controls of the base station 400 such as input power provisioning, control of a plurality of wireless power transmitters, and user interface control.

[0099] The primary coil can generate an electromagnetic field using alternating current power (or voltage or current). The primary coil can receive the application of alternating current power (or voltage or current) of a specific frequency output by the power conversion circuit 110, thereby generating a magnetic field of a specific frequency. The magnetic field can be generated non-radiatively or radiatively, and the wireless power receiver 200 will receive this and generate an electric current. That is, the primary coil transmits power wirelessly.

[0100] In the magnetic induction method, the primary coil and the secondary coil can have any suitable form. For example, they can be copper wires wound around a formation with high magnetic permeability such as ferrite or amorphous metal. The primary coil may also be called a transmitting coil, a primary core, a primary winding, a primary loop antenna, etc. On the other hand, the secondary coil may also be called a receiving coil, a secondary core, a secondary winding, a secondary loop antenna, a pickup antenna, etc.

[0101] When using the magnetic resonance method, the primary coil and the secondary coil can each be provided in the form of a primary resonance antenna and a secondary resonance antenna. The resonance antenna can have a resonance structure including a coil and a capacitor. At this time, the resonance frequency of the resonance antenna is determined by the inductance of the coil and the capacitance of the capacitor. Here, the coil can be in the form of a loop. Also, a core can be arranged inside the loop. The core can include a physical core such as a ferrite core or an air core.

[0102] Energy transmission between the primary resonance antenna and the secondary resonance antenna can be performed through the resonance phenomenon of the magnetic field. The resonance phenomenon means that when a near field corresponding to the resonance frequency is generated in one resonance antenna and other resonance antennas are located around it, both resonance antennas are coupled to each other and high-efficiency energy transfer occurs between the resonance antennas. When a magnetic field corresponding to the resonance frequency is generated between the primary resonance antenna and the secondary resonance antenna, a phenomenon occurs in which the primary resonance antenna and the secondary resonance antenna resonate with each other. As a result, in general, compared to the case where the magnetic field generated by the primary resonance antenna is radiated into free space, the magnetic field is concentrated toward the secondary resonance antenna with high efficiency. Therefore, energy can be transferred from the primary resonance antenna to the secondary resonance antenna with high efficiency. The magnetic induction method can be implemented to be similar to the magnetic resonance method. However, at this time, the frequency of the magnetic field does not need to be the resonance frequency. Instead, in the magnetic induction method, matching between the loops constituting the primary coil and the secondary coil is required, and the distance between the loops must be quite close.

[0103] Although not shown in the drawings, the wireless power transmission device 100 may further include a communication antenna. The communication antenna can transmit and receive communication signals using communication carriers other than magnetic field communication. For example, the communication antenna can transmit and receive communication signals such as Wi-Fi (registered trademark), Bluetooth (registered trademark), Bluetooth LE, ZigBee (registered trademark), and NFC.

[0104] The communication / control circuit 120 can transmit and receive information with the wireless power receiving device 200. The communication / control circuit 120 can include at least one of an IB communication module or an OB communication module.

[0105] The IB communication module can transmit and receive information by using magnetic waves with a specific frequency as the center frequency. For example, the communication / control circuit 120 can perform in-band communication by including communication information in the operating frequency of wireless power transmission and transmitting it through the primary coil, or by receiving the operating frequency containing information through the primary coil. At this time, modulation methods such as binary phase shift keying (BPSK), frequency shift keying (FSK), or amplitude shift keying (ASK), and coding methods such as Manchester coding or non-return-to-zero level (NZR-L) coding can be used to include information in the magnetic waves or interpret the magnetic waves containing information. By using such IB communication, the communication / control circuit 120 can transmit and receive information up to a distance of several meters at a data transmission rate of several kbps.

[0106] The OB communication module can also perform out-of-band communication through a communication antenna. For example, the communication / control circuit 120 can be provided by a short-range communication module. Examples of short-range communication modules include communication modules such as Wi-Fi, Bluetooth, Bluetooth LE, ZigBee, and NFC.

[0107] The communication / control circuit 120 can control the overall operation of the wireless power transmission device 100. The communication / control circuit 120 can perform calculations and processing of various information and control each component of the wireless power transmission device 100.

[0108] The communication / control circuit 120 can be implemented by a computer or a similar device using hardware, software, or a combination thereof. In terms of hardware, the communication / control circuit 120 can be provided in the form of an electronic circuit that processes electrical signals to perform control functions. In terms of software, it can be provided in the form of a program that drives the hardware communication / control circuit 120.

[0109] The communication / control circuit 120 can control the transmission power by controlling the operating point. The operating point to be controlled can correspond to a combination of frequency (or phase), duty cycle, duty ratio, and voltage amplitude. The communication / control circuit 120 can control the transmission power by adjusting at least one of frequency (or phase), duty cycle, duty ratio, and voltage amplitude. Also, the wireless power transmission device 100 can supply a certain amount of power, and the wireless power reception device 200 can control the received power by controlling the resonance frequency.

[0110] On the other hand, in the WPC system, the wireless power transmission device 100 can be classified, for example, from the perspective of the amount of power transmitted. At this time, the wireless power transmission device 100 that supports a maximum wireless power transmission amount of 5W (i.e., the wireless power transmission device 100 that supports the BPP protocol) can be classified, for example, into a type A wireless power transmission device 100 and a type B wireless power transmission device 100. The wireless power transmission device 100 that supports a maximum wireless power transmission amount of 15W (i.e., the wireless power transmission device 100 that supports the EPP protocol) can be classified, for example, into a type MP-A wireless power transmission device 100 and a type MP-B wireless power transmission device 100.

[0111] - Type A and type MP-A wireless power transmission devices 100

[0112] The wireless power transmission devices 100 of type A and type MP A may have one or more primary coils. Since the wireless power transmission devices 100 of type A and type MP A activate a single primary coil at a time, a single primary cell corresponding to the activated primary coil may be used.

[0113] - The wireless power transmission devices 100 of type B and type MP B

[0114] The power transmission devices of type B and type MP B may have a primary coil array. And the power transmission devices of type B and type MP B can enable free positioning. For this purpose, the power transmission devices of type B and type MP B can activate one or more primary coils in the array to realize primary cells at other positions on the interface surface.

[0115] The mobile device 450 includes a wireless power receiver 200 that receives wireless power via a secondary coil and a load 455 that receives the power transmitted by the wireless power receiver 200 and stores the power for supply to the device.

[0116] The wireless power receiver 200 can include a power pick-up circuit 210 and a communications & control circuit 220. The power pick-up circuit 210 can receive wireless power via the secondary coil and convert it into electrical energy. The power pick-up circuit 210 rectifies the AC signal obtained via the secondary coil and converts it into a DC signal. The communications & control circuit 220 can control the transmission and reception of wireless power (power transmission and reception).

[0117] The secondary coil can receive the wireless power transmitted by the wireless power transmission device 100. The secondary coil can receive power by using the magnetic field generated by the primary coil. Here, when the specific frequency is the resonance frequency, a magnetic resonance phenomenon occurs between the primary coil and the secondary coil, so that power can be transmitted more efficiently.

[0118] On the other hand, although not shown in FIG. 4, the communication / control circuit 220 may further include a communication antenna. The communication antenna can transmit and receive communication signals by using a communication carrier other than magnetic field communication. For example, the communication antenna can transmit and receive communication signals such as Wi-Fi, Bluetooth, Bluetooth LE, ZigBee, and NFC.

[0119] The communication / control circuit 220 can transmit and receive information with the wireless power transmission device 100. The communication / control circuit 220 can include at least one of an IB communication module or an OB communication module.

[0120] The IB communication module can transmit and receive information by using magnetic waves with a specific frequency as the center frequency. For example, the communication / control circuit 220 can execute IB communication by including information in the magnetic waves and transmitting them through the secondary coil, or receiving the magnetic waves containing information through the secondary coil. At this time, modulation methods such as binary phase shift keying (BPSK), frequency shift keying (FSK), or amplitude shift keying (ASK), and coding methods such as Manchester coding or non-return-to-zero level (NZR-L) coding can be used to include information in the magnetic waves or interpret the magnetic waves containing information. By using such IB communication, the communication / control circuit 220 can transmit and receive information up to a distance of several meters at a data transmission rate of several kbps.

[0121] The OB communication module can also execute out-of-band communication through a communication antenna. For example, the communication / control circuit 220 can be provided by a short-range communication module.

[0122] Examples of short-range communication modules include communication modules such as Wi-Fi, Bluetooth, Bluetooth LE, ZigBee, and NFC.

[0123] The communication / control circuit 220 can control the overall operation of the wireless power receiving device 200. The communication / control circuit 220 can execute operations and processing of various information and control each component of the wireless power receiving device 200.

[0124] The communication / control circuit 220 can be implemented by a computer or a similar device using hardware, software, or a combination thereof. In terms of hardware, the communication / control circuit 220 can be provided in the form of an electronic circuit that processes electrical signals to perform control functions. In terms of software, it can be provided in the form of a program that drives the hardware communication / control circuit 220.

[0125] When the communication / control circuit 120 and the communication / control circuit 220 are Bluetooth or Bluetooth LE as an OB communication module or a short-range communication module, the communication / control circuit 120 and the communication / control circuit 220 can be implemented and operate with a communication architecture as shown in FIG. 5, respectively.

[0126] FIG. 5 is a diagram showing an example of a Bluetooth communication architecture to which an embodiment according to the present specification can be applied.

[0127] Referring to FIG. 5, (a) of FIG. 5 shows an example of a protocol stack of Bluetooth BR (Basic Rate) / EDR (Enhanced Data Rate) that supports GATT, and (b) shows an example of a protocol stack of Bluetooth LE (Low Energy).

[0128] Specifically, as shown in (a) of FIG. 5, the Bluetooth BR / EDR protocol stack may include an upper controller stack 460 and a lower host stack 470 based on the Host Controller Interface (HCI, 18).

[0129] The host stack (or host module) 470 refers to a wireless transceiver module that receives 2.4 GHz Bluetooth signals and the hardware for transmitting or receiving Bluetooth packets. The controller stack 460 is connected to the Bluetooth module to control the Bluetooth module to execute operations.

[0130] The host stack 470 may include a BR / EDR PHY layer 12, a BR / EDR Baseband layer 14, and a Link Manager layer 16.

[0131] The BR / EDR PHY layer 12 is a layer that transmits and receives 2.4 GHz wireless signals. When using GFSK (Gaussian Frequency Shift Keying) modulation, it can transmit data by hopping among 79 RF channels.

[0132] The BR / EDR Baseband layer 14 plays a role in transmitting digital signals, selects a channel sequence that hops 1400 times per second, and transmits a time slot with a length of 625 us for each channel.

[0133] The Link Manager layer 16 utilizes the LMP (Link Manager Protocol) to control the overall operations of the Bluetooth Connection (link setup, control, security).

[0134] The Link Manager layer 16 can execute the following functions.

[0135] - Perform ACL / SCO logical transport, logical link setup, and control.

[0136] -Detach: Interrupt the connection and notify the other device of the interruption reason.

[0137] -Perform power control and role switch.

[0138] -Execute security (authentication, pairing, encryption) functions.

[0139] The host controller interface layer 18 is provided for the interface between the host module and the controller module, enabling the host to provide commands and data to the controller and allowing the controller to provide events and data to the host.

[0140] The host stack (or host module) 20 includes the Logical Link Control and Adaptation Protocol (L2CAP) 21, Attribute Protocol 22, Generic Attribute Profile (GATT) 23, Generic Access Profile (GAP) 24, and BR / EDR profile 25.

[0141] The Logical Link Control and Adaptation Protocol (L2CAP) 21 can provide a single bidirectional channel for transmitting data to a specific protocol or profile.

[0142] The L2CAP 21 can multiplex various protocols, profiles, etc. provided above Bluetooth.

[0143] In the L2CAP of Bluetooth BR / EDR, dynamic channels are used to support protocol service multiplexer, retransmission, and streaming mode, and provide segmentation and reassembly, per-channel flow control, and error control.

[0144] The General Attribute Profile (GATT) 23 can operate as a protocol that explains how the Attribute Protocol 22 is utilized during service configuration. For example, the General Attribute Profile 23 can operate to define how ATT attributes are grouped together as services and can operate to explain features associated with the services.

[0145] Therefore, the General Attribute Profile 23 and the Attribute Protocol (ATT) 22 can use features to describe the state of the device and services, explain how features are related to each other, and how they are utilized.

[0146] The Attribute Protocol 22 and the BR / EDR Profile 25 define the definition of services using Bluetooth BR / EDR and the application protocol for exchanging these data, and the Generic Access Profile (GAP) 24 defines device discovery, connection, and security levels.

[0147] As shown in FIG. 5(b), the Bluetooth LE protocol stack includes a Controller stack 480 operable to process a radio device interface where timing is critical, and a Host stack 490 operable to process high-level data.

[0148] First, the controller stack 480 can be implemented using a communication module that can include a Bluetooth wireless device, for example, a processor module that can include a processing device such as a microprocessor.

[0149] The host stack 490 is a part of the OS that operates on the processor module or can be implemented by instantiating a package on the OS.

[0150] In some cases, the controller stack and the host stack can operate or execute on the same processing device within the processor module.

[0151] The controller stack 480 includes a Physical Layer (PHY) 32, a Link Layer 34, and a Host Controller Interface 36.

[0152] The Physical Layer (PHY, wireless transceiver module) 32 is a layer that transmits and receives 2.4 GHz wireless signals and uses a frequency hopping technique composed of GFSK (Gaussian Frequency Shift Keying) modulation and 40 RF channels.

[0153] The Link Layer 34, which functions to transmit or receive Bluetooth packets, uses three Advertising channels to perform Advertising and Scanning functions and then generates a device connection, and provides a function to exchange data packets of up to 257 bytes via 37 Data channels.

[0154] The host stack may include a Generic Access Profile (GAP) 40, a Logical Link Control and Adaptation Protocol (L2CAP) 41, a Security Manager (SM) 42, an Attribute Protocol (ATT) 440, a Generic Attribute Profile (GATT) 44, a Generic Access Profile 25, and an LT Profile 46. However, the host stack 490 is not limited thereto and may include various protocols and profiles.

[0155] The host stack multiplexes various protocols, profiles, etc. provided above Bluetooth using L2CAP.

[0156] First, the Logical Link Control and Adaptation Protocol (L2CAP) 41 can provide a single bidirectional channel for transmitting data to a specific protocol or profile.

[0157] The L2CAP 41 can operate to multiplex data between upper layer protocols, segment and reassemble packages, and manage multicast data transmission.

[0158] In Bluetooth LE, three fixed channels (one for the signaling CH, one for the Security Manager, and one for the Attribute protocol) are basically used. And dynamic channels may be used as necessary.

[0159] On the one hand, in BR / EDR (Basic Rate / Enhanced Data Rate), dynamic channels are basically used to support protocol service multiplexer, retransmission, streaming mode, etc.

[0160] The SM (Security Manager) 42 is a protocol for authenticating devices and providing key distribution.

[0161] The ATT (Attribute Protocol) 43 defines rules for accessing the data of the peer device in a Server-Client structure. ATT has the following six types of message types (Request, Response, Command, Notification, Indication, Confirmation).

[0162] (1) Request and Response messages: The Request message is a message for requesting and transmitting specific information from the client device to the server device. The Response message is a response message to the Request message and can be used for the purpose of being sent from the server device to the client device.

[0163] (2) Command message: It is a message mainly sent from the client device to the server device to instruct specific operations, and the server device does not send a response to the Command message to the client device.

[0164] (3) Notification message: It is a message sent from the server device to the client device for notifications such as events, and the client device does not send a confirmation message for the Notification message to the server device.

[0165] (4) Indication and Confirm Messages: Messages sent from the server device to the client device for notifications such as events. Different from Notification messages, the client device sends a confirmation message (Confirm message) for the Indication message to the server device.

[0166] This specification uses the Attribute Protocol (ATT) 43 in the GATT profile to send a value for the data length when requesting long data, enabling the client to clearly understand the data length and receive characteristic values from the server using UUIDs.

[0167] The General Access Profile (GAP) 45 is a newly implemented layer for Bluetooth LE technology and is used to control role selection and how multi-profile operation occurs for communication between Bluetooth LE devices.

[0168] Also, the General Access Profile 45 is mainly used in the device discovery, connection generation, and security procedure parts, defines a scheme to provide information to the user, and defines the following types of attributes.

[0169] (1) Service: A combination of behaviors related to data that defines the basic operations of a device

[0170] (2) Include: Defines the relationship between services

[0171] (3) Characteristics: The data values used in a service

[0172] (4) Behavior: A format readable by a computer defined by UUID (Universal Unique Identifier, value type)

[0173] The LE profile 46 is a profile that depends on GATT and is mainly applied to Bluetooth LE devices. The LE profile 46 can be, for example, Battery, Time, FindMe, Proximity, Time, etc. The specific content of GATT-based Profiles is as follows.

[0174] (1) Battery: Method for exchanging battery information

[0175] (2) Time: Method for exchanging time information

[0176] (3) FindMe: Providing an alarm service according to distance

[0177] (4) Proximity: Method for exchanging battery information

[0178] (5) Time: Method for exchanging time information

[0179] The general attribute profile (GATT) 44 can operate as a protocol that explains how the attribute protocol 43 is utilized when configuring a service. For example, the general attribute profile 44 can operate to define how ATT attributes are grouped together as a service and can operate to explain the characteristics related to the service.

[0180] Therefore, the general attribute profile 44 and the attribute protocol (ATT) 43 can use characteristics to describe the state of the device and the service and to explain how the characteristics are related to each other and how they are utilized.

[0181] Hereinafter, the procedure of Bluetooth Low Energy (BLE) technology will be briefly described.

[0182] The BLE procedures can be divided into a Device Filtering Procedure, an Advertising Procedure, a Scanning Procedure, a Discovering Procedure, a Connecting Procedure, etc.

[0183] Device Filtering Procedure

[0184] The device filtering procedure is a method for reducing the number of devices that execute responses to requests, instructions, notifications, etc. in the controller stack.

[0185] When receiving requests on all devices, since it is not necessary to respond to them, the controller stack can reduce the number of requests sent and control the power consumption in the BLE controller stack to decrease.

[0186] The advertising device or the scanning device can execute the device filtering procedure to limit the devices that receive advertising packets, scan requests, or connection requests.

[0187] Here, the advertising device is a device that transmits an advertising event, that is, executes advertising, and is also expressed as an advertiser.

[0188] The scanning device refers to a device that executes scanning and a device that sends a scan request.

[0189] In BLE, when a scanning device receives some advertising packets from an advertising device, the scanning device needs to send a scan request to the advertising device.

[0190] However, if a device filtering procedure is used and it is unnecessary to send a scan request, the scanning device can ignore the advertisement packets sent from the advertising device.

[0191] The device filtering procedure can also be used during the connection request process. If device filtering is used during the connection request process, by ignoring the connection request, it becomes unnecessary to send a response to the connection request.

[0192] Advertising Procedure

[0193] The advertising device executes an advertising procedure to perform an undirected broadcast to devices within the area.

[0194] Here, undirected advertising is advertising directed at all devices that is not a broadcast directed at a specific device, and all devices can scan the advertising to request additional information or a connection request.

[0195] In contrast, directed advertising allows only the specified device to scan the advertising to request additional information or a connection request.

[0196] The advertising procedure is used to establish a Bluetooth connection with a nearby initiating device.

[0197] Or, the advertising procedure can be used to provide periodic broadcasts of user data to scanning devices that are listening on the advertising channel.

[0198] In the advertising procedure, all advertisements (or advertising events) are broadcast via an advertising physical channel.

[0199] An advertising device can receive a scan request from a listening device that is performing listening in order to obtain additional user data from the listening device. The advertising device transmits a response to the scan request to the device that sent the scan request via the same advertising physical channel as the advertising physical channel on which the scan request was received.

[0200] The broadcast user data sent as part of an advertisement packet is dynamic data, whereas the scan response data is generally static data.

[0201] An advertising device can receive a connection request from an initiating device on an advertising (broadcast) physical channel. If the advertising device uses an advertisable advertising event and the initiating device is not filtered by the device filtering procedure, the advertising device stops advertising and proceeds to the connected mode. The advertising device can start advertising again after the connected mode.

[0202] Scanning Procedure

[0203] A device that performs scanning, i.e., a scanning device, executes a scanning procedure to listen for an unaddressed broadcast of user data from an advertising device that uses an advertising physical channel.

[0204] The scanning device transmits a scan request to the advertising device via the advertising physical channel in order to request additional data from the advertising device. The advertising device transmits a scan response, which is a response to the scan request, containing the additional data requested by the scanning device via the advertising physical channel.

[0205] The scanning procedure can be used while connected to other BLE devices in a BLE piconet.

[0206] If a scanning device receives an advertising event broadcast by a device and is in initiator mode where it can start a connection request, the scanning device can initiate a Bluetooth connection with the advertising device by sending a connection request to the advertising device via the advertising physical channel.

[0207] When the scanning device sends a connection request to the advertising device, the scanning device stops initiator mode scanning for additional broadcasts and proceeds to the connection mode.

[0208] Discovering Procedure

[0209] Devices capable of Bluetooth communication (hereinafter referred to as "Bluetooth devices") execute an advertising procedure and a scanning procedure to discover nearby devices or to be discovered by other devices within a given area.

[0210] The discovering procedure is executed asymmetrically. A Bluetooth device seeking other surrounding devices is called a discovering device and listens to discover advertising devices that broadcast scanable advertising events. A Bluetooth device that can be discovered by other devices and is available is called a discoverable device, and actively broadcasts advertising events that are scanable by other devices via the advertising (broadcast) physical channel.

[0211] Both the discovering device and the discoverable device can already be connected to other Bluetooth devices in a piconet.

[0212] Connecting Procedure

[0213] The connection procedure is asymmetric, and it requires that while a specific Bluetooth device is performing the advertising procedure, other Bluetooth devices perform the scanning procedure.

[0214] That is, the advertising procedure can serve the purpose, and as a result, only one device should respond to the advertisement. After receiving a connectable advertising event from the advertising device, the connection can be initiated by sending a connection request to the advertising device via the advertising (broadcast) physical channel.

[0215] Next, the operating states in BLE technology, namely, the advertising state, scanning state, initiating state, and connection state, will be briefly described.

[0216] Advertising State

[0217] The Link Layer (LL) enters the advertising state upon the host (stack)'s instruction. When the Link Layer is in the advertising state, the Link Layer transmits an advertising PDU (Packet Data Unit) from advertising events and the like.

[0218] Each advertising event is composed of at least one advertising PDU, and the advertising PDU is transmitted via the advertising channel index used. The advertising event can end earlier when the advertising event is transmitted via the advertising channel index used by the advertising PDU, or when the advertising device needs to secure space for other function executions.

[0219] Scanning State

[0220] The link layer enters the scanning state upon the instruction of the host (stack). In the scanning state, the link layer listens for the advertising channel index.

[0221] There are two types of scanning states: passive scanning and active scanning, and each scanning type is determined by the host.

[0222] No separate time or advertising channel index for scanning is defined.

[0223] During the scanning state, the link layer listens for the advertising channel index during the scan window duration. The scan interval is defined as the interval between the start points of two consecutive scan windows.

[0224] If there is no scheduling conflict, the link layer must listen for all scan intervals of the scan window as instructed by the host. The link layer in each scan window must scan other advertising channel indexes. The link layer uses all available advertising channel indexes.

[0225] When it is passive scanning, the link layer only receives packets and cannot send any packets.

[0226] When it is active scanning, the link layer listens because it depends on the advertising PDU type that can request the advertising PDU and additional information related to the advertising device from the advertising device.

[0227] Initiating State

[0228] The link layer enters the start state upon the instruction of the host (stack).

[0229] When the link layer is in the start state, the link layer listens for the advertising channel index.

[0230] During the start state, the link layer listens for the advertising channel index within the scan window interval.

[0231] Connection state

[0232] The link layer enters the connection state when the device making the connection request, i.e., the initiating device, sends a CONNECT_REQ PDU to the advertising device or when the advertising device receives a CONNECT_REQ PDU from the initiating device.

[0233] After entering the connection state, it is considered that a connection is established. However, it is not necessary to consider that the connection is established at the moment when it enters the connection state. The only difference between the newly established connection and the pre-established connection is only the link layer connection supervision timeout value.

[0234] When both devices are connected, both devices play different roles.

[0235] The link layer playing the master role is called the master, and the link layer playing the slave role is called the slave. The master adjusts the timing of connection events, and the connection event refers to the time point when synchronization occurs between the master and the slave.

[0236] Below, the packets defined in the Bluetooth interface will be briefly described. The BLE device uses the packets defined below.

[0237] Packet Format

[0238] The Link Layer has only one packet format that is used for both advertising channel packets and data channel packets.

[0239] Each packet consists of four fields: a preamble, an access address, a PDU (Packet Data Unit), and a CRC.

[0240] When a packet is transmitted from the advertising physical channel, the PDU should be an advertising channel PDU, and when a packet is transmitted from the data physical channel, the PDU should be a data channel PDU.

[0241] Advertising Channel PDU

[0242] The Advertising Channel PDU (Packet Data Circuit) has a 16-bit header and a payload of various sizes.

[0243] The PDU type field of the advertising channel PDU included in the header indicates the PDU type as defined in Table 1 below.

[0244] [Table 1]

[0245] Advertising PDU

[0246] The following advertising channel PDU types are called advertising PDUs and are used in specific events.

[0247] ADV_IND: Connectable undirected advertising event

[0248] ADV_DIRECT_IND: Connectable Directed Advertising Event

[0249] ADV_NONCONN_IND: Non - connectable Undirected Advertising Event

[0250] ADV_SCAN_IND: Scanable Undirected Advertising Event

[0251] The PDU is transmitted from the Link Layer in the advertising state and received by the Link Layer in the scanning state or the Initiating State.

[0252] Scanning PDU

[0253] The following advertising channel PDU types are called Scanning PDUs and are used in the states described below.

[0254] SCAN_REQ: Transmitted by the Link Layer in the scanning state and received by the Link Layer in the advertising state.

[0255] SCAN_RSP: Transmitted by the Link Layer in the advertising state and received by the Link Layer in the scanning state.

[0256] Initiating PDUs

[0257] The following advertising channel PDU types are called Initiating PDUs.

[0258] CONNECT_REQ: Transmitted by the Link Layer in the initiating state and received by the Link Layer in the advertising state.

[0259] Data Channel PDU

[0260] The data channel PDU has a 16-bit header, a payload of various sizes, and can include a Message Integrity Check (MIC) field.

[0261] As described above, procedures, states, packet formats, etc. in the BLE technology can be applied to execute the method proposed in this specification.

[0262] Referring to FIG. 4 again, the load 455 is a battery. The battery can store energy using the power output from the power pickup circuit 210. On the other hand, the mobile device 450 does not necessarily have to include a battery. For example, the battery can be provided in an external configuration that is detachable. As another example, the wireless power receiving device 200 can include driving means for driving various operations of the electronic device instead of a battery.

[0263] The mobile device 450 is shown as including the wireless power receiving device 200, and the base station 400 is shown as including the wireless power transmitting device 100. In a broad sense, the wireless power receiving device 200 can be regarded as the same as the mobile device 450, and the wireless power transmitting device 100 can also be regarded as the same as the base station 400.

[0264] When the communication / control circuit 120 and the communication / control circuit 220 include Bluetooth or Bluetooth LE as an OB communication module or a short-range communication module in addition to the IB communication module, the wireless power transmitting device 100 including the communication / control circuit 120 and the wireless power receiving device 200 including the communication / control circuit 220 can be represented by a simplified block diagram as shown in FIG. 6.

[0265] FIG. 6 is a block diagram showing a wireless power transmission system using BLE communication as an example.

[0266] Referring to FIG. 6, the wireless power transmission device 100 includes a power conversion circuit 110 and a communication / control circuit 120. The communication / control circuit 120 includes an in-band communication module 121 and a BLE communication module 122.

[0267] On the other hand, the wireless power reception device 200 includes a power pickup circuit 210 and a communication / control circuit 220. The communication / control circuit 220 includes an in-band communication module 221 and a BLE communication module 222.

[0268] On one side, the BLE communication modules 122 and 222 execute the architecture and operations according to FIG. 5. For example, the BLE communication modules 122 and 222 may be used to establish a connection between the wireless power transmission device 100 and the wireless power reception device 200 and exchange control information and packets necessary for wireless power transmission.

[0269] On another side, the communication / control circuit 120 may be configured to operate a profile for wireless charging. Here, the profile for wireless charging may be GATT that utilizes BLE transmission.

[0270] FIG. 7 is a block diagram showing a wireless power transmission system that utilizes BLE communication according to another example.

[0271] Referring to FIG. 7, the communication / control circuits 120 and 220 each include only the in-band communication modules 121 and 221, and the BLE communication modules 122 and 222 may be provided separately from the communication / control circuits 120 and 220.

[0272] Hereinafter, the coil or coil part includes a coil and at least one element adjacent to the coil, and may be referred to as a coil assembly, a coil cell or a cell.

[0273] When a user places the wireless power receiving device 200 within the operating space of the wireless power transmitting device 100, both the wireless power transmitting device 100 and the wireless power receiving device 200 start communicating for the purpose of configuring and controlling power transmission. At this time, the power signal can provide a carrier for all communications, and the protocol for communications can be composed of multiple stages. Hereinafter, the communication protocol will be described.

[0274] FIG. 8 is a state transition diagram for explaining the wireless power transmission procedure.

[0275] The WPC can define two communication protocols.

[0276] - Baseline Protocol (or BPP): It can mean the original protocol that supports only one-way communication from the wireless power receiving device 200 to the wireless power transmitting device 100.

[0277] - Extended Protocol (or EPP): It can support two-way communication and an improved FOD (foreign object detection) function, and can also support a data transmission stream function and an authentication option.

[0278] Referring to FIG. 8, the power transmission operation between the wireless power transmitting device 100 and the wireless power receiving device 200 according to an embodiment of the present specification can be largely divided into a Ping Phase 810, a Configuration Phase 820, a Negotiation Phase 830, and a Power Transfer Phase.

[0279] - Ping Phase 810

[0280] In the pin phase 810, the wireless power transmitter 100 can attempt to establish communication with the wireless power receiver 200. Before attempting to establish communication, measurements may be taken to confirm whether there are objects such as bank cards, coins, or other metals that may be damaged or heated during power transmission. Here, such measurements may be taken without waking up the wireless power receiver 200.

[0281] Here, after obtaining design information from the wireless power receiver 200, the wireless power transmitter 100 can defer the conclusion regarding whether the detected metal is a foreign object or a friendly metal to the negotiation phase 830.

[0282] - Configuration phase 820

[0283] In the configuration phase 820, the wireless power receiver 200 can transmit basic identification and configuration data to the wireless power receiver 200. Then, both the wireless power transmitter 100 and the wireless power receiver 200 can use this information to generate a baseline power transfer contract.

[0284] Also, the wireless power transmitter 100 and the wireless power receiver 200 can decide whether to continue with the Baseline Protocol or the Extended Protocol in the configuration phase 820.

[0285] Here, the wireless power receiver 200 can utilize functions such as improved FOD, data transmission stream, and authentication only when implementing the extended protocol.

[0286] - Negotiation phase 830

[0287] In the negotiation phase 830, the wireless power transmitter 100 and the wireless power receiver 200 can set an extended power transfer contract that includes additional settings and restrictions. Also, the wireless power receiver 200 can provide design information to the wireless power transmitter 100. Later, the design information can be used to complete the FOD before switching to the power transmission phase 840.

[0288] Here, the negotiation phase 830 can correspond to a stage that does not exist in the baseline protocol.

[0289] - Power Transmission Phase 840

[0290] The power transmission phase 840 can be a stage where power is transmitted to the load of the wireless power receiver 200.

[0291] In the extended protocol, the wireless power transmitter 100 and the wireless power receiver 200 can perform system calibration when this stage starts. This stage may sometimes be interrupted to renegotiate the elements of the power transfer contract, but power transmission may continue during such renegotiation.

[0292] Hereinafter, the protocols for the aforementioned Ping Phase 810, Configuration Phase 820, Negotiation Phase 830, and Power Transmission Phase 840 will be described in more detail respectively.

[0293] 1. Ping Phase 810

[0294] When the pin phase 810 starts, the wireless power transmission device 100 still doesn't know whether the wireless power reception device 200 is within the operating volume. Also, the wireless power transmission device 100 cannot recognize the wireless power reception device 200. The reason is that this system is generally deactivated due to a lack of power signal.

[0295] In such a situation, before the wireless power transmission device 100 starts the digital pin to request a response from the wireless power reception device 200, the wireless power transmission device 100 may go through the following steps.

[0296] Figure 9 schematically shows an example for the protocol of the pin phase 810.

[0297] According to Figure 9, the wireless power transmission device 100 can execute an analog pin (S910). That is, the wireless power transmission device 100 can send an analog pin to check whether there is an object within the operating volume. For example, the wireless power transmission device can sense whether there is an object within the operating volume based on the current change of the transmission coil or the primary coil.

[0298] The wireless power transmission device 100 can apply NFC tag protection (S920). Here, the protection of the NFC tag can be executed by the following procedure.

[0299] a) First, it can be confirmed whether one or more of the sensed individuals contain an NFC tag.

[0300] b) Subsequently, in the case of an object containing an NFC tag, it can be confirmed whether it can withstand the power signal without being damaged.

[0301] c) If the wireless power transmitter 100 determines that the NFC tag cannot withstand the power signal, it holds the pin stage without starting the digital pin, and the wireless power transmitter 100 can inform the user of the reason for not continuing the execution.

[0302] The wireless power transmitter 100 can perform foreign object sensing (S930). That is, the wireless power transmitter 100 can collect information useful for determining whether there is a foreign object other than the wireless power receiver 200. For this purpose, the wireless power transmitter 100 can use various methods such as the free-power FOD method.

[0303] On the other hand, in the three stages (S910, S920, S930) described above, the wireless power receiver does not have to operate.

[0304] When the wireless power transmitter 100 executes the above stage and determines that the wireless power receiver 200 is potentially present in the operating space, the wireless power transmitter 100 can start the digital pin (S940). Here, the digital pin can request a response such as a SIG (signal strength) data packet or an EPT (End Power Transfer) data packet from the wireless power receiver 200.

[0305] Thereafter, the wireless power transmitter 100 can receive SIG or EPT from the wireless power receiver 200 (S950). Here, the SIG data packet can provide a measurement of coupling, and the SIG data packet can include information on the signal strength value. Also, the EPT data packet can provide a power transmission stop request and the reason for the request.

[0306] If the wireless power transmitter 100 cannot receive the above response from the wireless power receiver 200, the wireless power transmitter 100 can repeat the above stage while staying at the pin phase 810.

[0307] 2. Configuration phase 820

[0308] The configuration phase 820 is part of the following protocol.

[0309] - The wireless power receiving device 200 can cause the wireless power transmitting device 100 to identify itself.

[0310] - The wireless power receiving device 200 and the wireless power transmitting device 100 can establish a baseline power transfer contract.

[0311] - The wireless power receiving device 200 and the wireless power transmitting device 100 can determine a protocol modification to be used for power transmission.

[0312] In the configuration phase 820, the wireless power transmitting device 100 and the wireless power receiving device 200 can continue to operate using digital pin parameters. This can mean that the power and current levels of both the wireless power transmitting device 100 and the wireless power receiving device 200 are changed only when the user moves the wireless power receiving device 200 within the operating space.

[0313] Hereinafter, the protocol in the configuration phase 820 will be described more specifically.

[0314] FIG. 10 schematically shows an example of the protocol for the configuration phase 820.

[0315] According to FIG. 10, the wireless power transmitting device 100 can receive an ID (identification) from the wireless power receiving device 200 (S1010). Alternatively, the wireless power transmitting device 100 can also receive an XID (extended identification) from the wireless power receiving device 200 (S1020). That is, the wireless power receiving device 200 can identify itself using the ID data packet and optionally the XID data packet.

[0316] The wireless power transmission device 100 can selectively receive a PCH (power control hold-off) data packet from the wireless power reception device 200 (S1030), and the wireless power transmission device 100 can receive a CFG data packet from the wireless power reception device 200 (S1040). That is, the wireless power reception device 200 can use the PCH and / or CFG data packet to provide data for use in the power transmission contract.

[0317] Finally, the wireless power transmission device 100 can preferably check the extended protocol (S1050).

[0318] Summarizing and organizing each of the above-described data packets, it is as follows.

[0319] - ID: The ID data packet can be information for identifying the wireless power reception device 200. Here, the ID may include a manufacturer code, a basic device identifier, etc. The ID may also include information for identifying the presence or absence of the XID data packet in the setting phase.

[0320] - XID: The XID data packet may include additional identification data.

[0321] - PCH: The PCH data packet can constitute a delay between the reception of the CE data packet and the start of coil current adjustment by the wireless power transmission device 100.

[0322] - CFG: The CFG data packet can provide basic configuration data.

[0323] For example, the CFG data packet can provide all parameters for recommending power transmission in the baseline protocol. At the same time, the CFG data packet can provide all FSK communication parameters used in the extended protocol. The CFG data packet can also provide additional functions of the wireless power reception device 200.

[0324] FIG. 11 is a drawing showing a message field of a configuration packet (CFG) of a wireless power receiving device according to an embodiment.

[0325] According to FIG. 11, a configuration packet (CFG) according to an embodiment may have a header value of 0x51, and the message field of the configuration packet (CFG) may include a 1-bit authentication (AI) flag and a 1-bit outband (OB) flag.

[0326] The authentication flag (AI) indicates whether the wireless power receiving device supports an authentication function. For example, when the value of the authentication flag (AI) is "1", it indicates that the wireless power receiving device supports the authentication function or can operate as an authentication initiator, and when the value of the authentication flag (AI) is "0", it can indicate that the wireless power receiving device does not support the authentication function or cannot operate as an authentication initiator.

[0327] The outband (OB) flag indicates whether the wireless power receiving device supports outband communication. For example, when the value of the outband (OB) flag is "1", it indicates that the wireless power receiving device indicates outband communication, and when the value of the outband (OB) flag is "0", it can indicate that the wireless power receiving device does not support outband communication.

[0328] The provision of the foregoing ID and / or XID is for identification. And the provision of PCH and / or CFG is for building a power transmission contract.

[0329] 3. Negotiation Phase 830

[0330] The negotiation phase 830 is part of an extended protocol in which the wireless power transmission device 100 and the wireless power receiving device 200 can change a power transmission contract. There are two types at this stage.

[0331] - Negotiation Phase 830: The negotiation phase 830 is directly connected after the configuration phase 820 and plays a role in generating an initial extended power transmission contract. At the same time, the negotiation phase 830 also plays a role in completing the pre-power FOD function. Here, the length of the negotiation phase is not restricted.

[0332] - Re-negotiation Phase: The re-negotiation phase can interrupt the power transmission phase 840 multiple times and generally plays a role in adjusting a single element of the power transmission contract. Also, the FOD / qf, FOD / rf, and SRQ / rpr data packets may not be used in the re-negotiation phase. The constraints on the CE data packets in the power transmission phase 840 limit the length of the re-negotiation phase.

[0333] During the negotiation phase or the re-negotiation phase, the power transmission contract (Power Transfer Contract) related to the reception / transmission of wireless power between the wireless power receiving device and the wireless power transmitting device may be extended or modified, or an update of the power transmission contract may be performed to adjust at least a part of the elements of the power transmission contract, or an exchange of information for establishing outband communication may be performed.

[0334] FIG. 12 is a flowchart schematically showing a protocol of the negotiation phase or the re-negotiation phase according to an embodiment.

[0335] Referring to FIG. 12, the wireless power transmitting device 100 can receive an FOD status data packet (e.g., FOD) from the wireless power receiving device 200 (S1210). Here, the wireless power receiving device 200 can use the FOD status data packet to inform the wireless power transmitting device 100 of the influence of its presence on the selected attributes of the reference wireless power transmitting device 100. Then, the wireless power transmitting device 100 can configure the FOD function using this information.

[0336] The wireless power transmitting device 100 can transmit an ACK / NAK for the above FOD status data packet to the wireless power receiving device 200 (S1215).

[0337] On the one hand, the wireless power receiving device 200 can receive the ID (Identification data packet), CAP (Capabilities data packet), and XCAP (extended CAP) of the wireless power transmitting device 100 by using a GRQ (General Request data packet).

[0338] The general request packet (GRQ) may have a header value of 0x07 and may include a 1-byte message field. The message field of the general request packet (GRQ) may include the header value of the data packet requested by the wireless power receiving device 200 from the wireless power transmitting device 100 using the GRQ packet.

[0339] For example, at the negotiation stage or the renegotiation stage, the wireless power receiving device 200 can transmit a GRQ packet (GRQ / id) requesting the ID packet of the wireless power transmitting device 100 to the wireless power transmitting device 100 (S1220).

[0340] The wireless power transmitting device 100 that has received the GRQ / id can transmit the ID packet to the wireless power receiving device 200 (S1225). The ID packet of the wireless power transmitting device 100 contains information about the "Manufacturer Code". The ID packet containing information about the "Manufacturer Code" enables the identification of the manufacturer of the wireless power transmitting device 100.

[0341] Alternatively, at the negotiation stage or the renegotiation stage, the wireless power receiving device 200 can transmit a GRQ packet (GRQ / cap) requesting the capabilities packet (CAP) of the wireless power transmitting device 100 to the wireless power transmitting device 100 (S1230). The message field of the GRQ / cap may include the header value (0x31) of the capabilities packet (CAP).

[0342] Upon receiving GRQ / cap, the wireless power transmission device 100 can transmit a performance packet (CAP) to the wireless power reception device 200 (S1235).

[0343] Alternatively, during the negotiation phase or the renegotiation phase, the wireless power reception device 200 can transmit a GRQ packet (GRQ / xcap) requesting the performance packet (CAP) of the wireless power transmission device 100 to the wireless power transmission device 100 (S1240). The message field of GRQ / xcap may include the header value (0x32) of the performance packet (XCAP).

[0344] Upon receiving GRQ / xcap, the wireless power transmission device 100 can transmit a performance packet (XCAP) to the wireless power reception device 200 (S1245).

[0345] FIG. 13 is a drawing showing the message field of the performance packet (CAP) of the wireless power transmission device according to an embodiment.

[0346] The performance packet (CAP) according to an embodiment may have a header value of 0x31 and may include a 3-byte message field with reference to FIG. 19.

[0347] Referring to FIG. 13, the message field of the performance packet (CAP) may include a 1-bit authentication (AR) flag and a 1-bit outband (OB) flag.

[0348] The authentication flag (AR) indicates whether the wireless power transmission device 100 supports the authentication function. For example, when the value of the authentication flag (AR) is "1", it indicates that the wireless power transmission device 100 supports the authentication function or can operate as an Authentication Responder, and when the value of the authentication flag (AR) is "0", it can indicate that the wireless power transmission device 100 does not support the authentication function or cannot operate as an Authentication Responder.

[0349] The outband (OB) flag indicates whether the wireless power transmission device 100 supports outband communication. For example, when the value of the outband (OB) flag is "1", the wireless power transmission device 100 indicates outband communication, and when the value of the outband (OB) flag is "0", the wireless power transmission device 100 can indicate that it does not support outband communication.

[0350] During the negotiation phase, the wireless power receiving device 200 can receive the performance packet (CAP) of the wireless power transmission device 100 and confirm whether the authentication function support and outband communication support of the wireless power transmission device 100 are available.

[0351] Returning to FIG. 12 again, the wireless power receiving device 200 can update the elements of the power transfer contract regarding the power provided in the power transmission phase using at least one specific request packet (SRQ, Specific Request data packet) during the negotiation phase or the renegotiation phase (S1250), and can receive an ACK / NAK for this (S1255).

[0352] On the other hand, to confirm the extended power transfer contract and end the negotiation phase, the wireless power receiving device 200 transmits SRQ / en to the wireless power transmission device 100 (S1260) and can receive an ACK from the wireless power transmission device 100 (S1265).

[0353] 4. Power Transmission Phase 840

[0354] The power transmission phase 840 is part of the protocol in which actual power is transmitted as the load of the wireless power receiving device 200. Here, the power transfer can be performed according to the conditions of the power transfer contract generated in the negotiation phase 830.

[0355] <Power Control Based on <CE>>

[0356] The wireless power receiving device 200 can transmit control error (CE) data that measures the deviation between the target and the actual operating location of the wireless power receiving device 200 to the wireless power transmitting device 100 to control the power level. The wireless power transmitting device 100 and the wireless power receiving device 200 aim to set the control error data to zero, and at this point, the system will operate at the target power level.

[0357] <In-power transfer FOD method>

[0358] In addition to the control error data, the wireless power transmitting device 100 and the wireless power receiving device 200 can exchange information to facilitate FOD. The wireless power receiving device 200 can periodically report the amount of power received (received power level) to the wireless power transmitting device 100, and the wireless power transmitting device 100 can inform the wireless power receiving device 200 whether a foreign object has been detected. Methods available for FOD during the power transmission phase can, for example, correspond to power loss calculations. In this approach, the wireless power transmitting device 100 compares the received power level reported by the wireless power receiving device 200 with the amount of transmitted power (transmitted power level) and can send a signal (regarding whether a foreign object has been monitored) to the wireless power receiving device 200 when the difference exceeds a threshold.

[0359] <Re-negotiation phase>

[0360] Depending on the situation, if necessary, the wireless power transmitting device 100 or the wireless power receiving device 200 can request a re-negotiation of the power transmission contract during the power transmission phase. Examples of changed situations in which a re-negotiation of the power transmission contract can be carried out are as follows.

[0361] - When the wireless power receiving device 200 requires (substantially) more power than previously negotiated.

[0362] - When it is detected that the wireless power transmission device 100 is operating with low efficiency.

[0363] - When the wireless power transmission device 100 cannot maintain the current power level any longer due to an increased operating temperature (or vice versa, i.e., when the wireless power reception device 200 can operate at a higher power level after being sufficiently cooled).

[0364] Here, an example of a specific protocol for the renegotiation phase is as described above.

[0365] <Data transmission stream>

[0366] The wireless power transmission device 100 and the wireless power reception device 200 can start a data transmission stream and exchange application-level data throughout the entire power transmission phase 840.

[0367] Here, an important common application is authentication, where both sides can confirm each other's credentials in an anti-modulation manner. For example, the wireless power reception device 200 can attempt to confirm the credentials of the wireless power transmission device 100 to determine whether it can be trusted to operate safely at a high power level. If there is appropriate authentication, it can mean passing the compliance test.

[0368] Therefore, in this specification, a method can be provided that starts power transmission at a low power level and controls the power to a higher level only after successfully completing the authentication protocol.

[0369] <Protocol in the power transmission phase 840>

[0370] The operation between the wireless power transmission device 100 and the wireless power reception device 200 in the power transmission phase 840 has been outlined above. Hereinafter, for a smooth understanding of the operation in the power transmission phase 840, the case of the protocol in the power transmission phase 840 being the baseline protocol and the case of the extended protocol will be described separately.

[0371] FIG. 14 schematically shows a flowchart of the data flow for the power transmission phase 840 in the baseline protocol.

[0372] According to FIG. 14, the wireless power reception device 200 can transmit CE to the wireless power transmission device 100 (S1410). Here, the wireless power reception device 200 can transmit normal CE data packets several times per second.

[0373] The wireless power reception device 200 can transmit an RP (received power) data packet (RP8 in the baseline protocol) to the wireless power transmission device 100 generally once every 1.5 seconds (S1420).

[0374] Optionally, the wireless power reception device 200 can transmit a CHS (charge status) data packet to the wireless power transmission device 100 (S1430).

[0375] Arranging and explaining the above-mentioned data packets, it is as follows.

[0376] -CE: The CE data packet can provide feedback on the desired power level. The CE data packet can include a control error value, where the control error value may be a signed integer value that is a relative measurement of the deviation between the actual operating point and the target operating point of the wireless power receiving device 200. If the control error value at this time is a positive value, it indicates that the actual operating point is below the target operating point, and it can be requested to increase the power signal to the wireless power transmitting device 100. If the control error value is a negative value, it indicates that the actual operating point is above the target operating point, and it can be requested to reduce the power signal to the wireless power transmitting device 100.

[0377] -RP8: The RP8 data packet can report the received power level. Here, the RP8 data packet may be included only in the baseline protocol.

[0378] -CHS: The CHS data packet can provide the charging level of the battery under load.

[0379] Figure 15 schematically shows a flowchart of the data flow for the power transmission phase 840 in the extended protocol.

[0380] According to Figure 15, the wireless power receiving device 200 can transmit CE to the wireless power transmitting device 100 (S1510). Here, the wireless power receiving device 200 can generally transmit the CE data packet several times per second.

[0381] The wireless power receiving device 200 can generally transmit an RP (received power) data packet (RP in the extended protocol) to the wireless power transmitting device 100 once every 1.5 seconds (S1515).

[0382] In the power transmission phase, the control error packet (CE) and the received power packet (RP) are data packets that should be repeatedly transmitted / received in accordance with the required timing constraints for the control of wireless power.

[0383] The wireless power transmission device 100 can control the level of the wireless power transmitted based on the control error packet (CE) and the received power packet (RP) received from the wireless power reception device 200.

[0384] On the other hand, in the extended protocol, the wireless power transmission device 100 can respond to the received power packet (RP) with bit patterns such as ACK, NAK, and ATN (S1520).

[0385] When the wireless power transmission device 100 responds with ACK to the received power packet (RP / 0) whose mode value is 0, it means that the power transmission can continue to be executed at the current level.

[0386] When the wireless power transmission device 100 responds with NAK to the received power packet (RP / 0) whose mode value is 0, it means that the wireless power reception device 200 should reduce power consumption.

[0387] When the wireless power transmission device 100 responds with ACK to the received power packet (RP / 1 or RP / 2) whose mode value is 1 or 2, it means that the wireless power reception device 200 has accepted the power correction value included in the received power packet (RP / 1 or RP / 2).

[0388] When the wireless power transmission device 100 responds with NAK to the received power packet (RP / 1 or RP / 2) whose mode value is 1 or 2, it means that the wireless power reception device 200 has not accepted the power correction value included in the received power packet (RP / 1 or RP / 2).

[0389] The received power packet (RP / 1) with the aforementioned mode value of 1 can mean the first calibration data point, and the received power packet (RP / 2) with the mode value of 2 can mean the additional calibration data point. Here, the wireless power receiving device can transmit the received power packet (RP / 2) with the mode value of 2 to the wireless power transmitting device several times to transmit a plurality of additional power correction values, and the wireless power transmitting device can perform a correction process based on the received RP / 1 and the plurality of RP / 2.

[0390] For the received power packet (RP), the wireless power transmitting device 100 responding with ATN means that the wireless power transmitting device 100 requests permission for communication. That is, the wireless power transmitting device 100 can transmit an ATN (attention) response pattern in response to the RP data packet to request the right to transmit a data packet. In other words, the wireless power transmitting device 100 can transmit ATN to the wireless power receiving device 200 in response to the RP data packet to request the wireless power receiving device 200 for the right to transmit a data packet.

[0391] Optionally, the wireless power receiving device 200 can transmit a CHS (charge status) data packet to the wireless power transmitting device 100 (S1525).

[0392] On the other hand, the wireless power transmitting device 100 and the wireless power receiving device 200 can exchange DSR (data stream response) data packets, CAP data packets, and NEGO data packets to initiate renegotiation for elements in the power transmission contract (generally, the guaranteed load power).

[0393] For example, the wireless power receiving device 200 transmits a DSR data packet to the wireless power transmitting device 100 (S1530), and the wireless power transmitting device 100 can transmit a CAP to the wireless power receiving device 200 (S1535).

[0394] Also, the wireless power receiving device 200 transmits a NEGO data packet to the wireless power transmitting device 100 (S1540), and the wireless power transmitting device 100 can transmit an ACK to the wireless power receiving device 200 in response to the NEGO data packet (S1545).

[0395] Here, if the data packets related to the start of the renegotiation phase are arranged, it is as follows.

[0396] -DSR: Any one of the following values may be set in the DSR data packet.

[0397] i) 0x00 - DSR / nak: Indicates that the last data packet received from the wireless power transmitting device 100 was rejected.

[0398] ii) 0x33 - DSR / poll: Invites the wireless power transmitting device 100 to send a data packet.

[0399] iii) 0x55 - DSR / nd: Indicates that the last data packet received from the wireless power transmitting device 100 was not expected.

[0400] iv) 0xFF - DSR / ack: Confirms that the last data packet received from the wireless power transmitting device 100 was correctly processed.

[0401] -CAP: The CAP data packet provides information about the functions of the wireless power transmitting device 100. The specific content is as described above.

[0402] -NEGO: The NEGO data packet can request the wireless power transmitting device 100 to perform operations in the renegotiation stage.

[0403] The wireless power transmitter 100 and the wireless power receiver 200 can utilize ADC (auxiliary data control), ADT (auxiliary data transport), and DSR data packets for the exchange of application-level data.

[0404] That is, from the perspective of transmitting and receiving a data transmission stream for the exchange of application-level data, the wireless power receiving device 200 can transmit ADC / ADT to the wireless power transmitting device 100 (S1550), and the wireless power transmitting device 100 can transmit ACK / NAK to the wireless power receiving device 200 as a response thereto (S1555). Also, the wireless power receiving device 200 can transmit DSR to the wireless power transmitting device 100 (S1560), and the wireless power transmitting device can transmit ADC / ADT to the wireless power receiving device (S1565).

[0405] Here, the data transmission stream serves to transmit application-level data from the data stream initiator to the data stream responder. And the application-level data can be broadly classified into i) authentication applications and ii) exclusive (general-purpose) applications.

[0406] Among the application-level data, messages / information related to the authentication application can be organized as follows.

[0407] Messages used in the authentication procedure are called authentication messages. Authentication messages are used to carry information related to authentication. There are two types of authentication messages. One is the authentication request, and the other is the authentication response. The authentication request is sent by the authentication initiator, and the authentication response is sent by the authentication responder. The wireless power transmitter and receiver can act as the authentication initiator or the authentication responder. For example, when the wireless power transmitter is the authentication initiator, the wireless power receiver acts as the authentication responder, and when the wireless power receiver is the authentication initiator, the wireless power transmitter acts as the authentication responder.

[0408] The authentication request message includes GET_DIGESTS, GET_CERTIFICATE, and CHALLENGE.

[0409] -GET_DIGESTS: This request can be used to search for the certificate chain digest. The wireless power receiver 200 can request as many digests as desired at one time.

[0410] -GET_CERTIFICATE: This request is used to read segments of the target certificate chain.

[0411] -CHALLENGE: This request can be used to initiate the authentication of the product device of the power transmitter.

[0412] The authentication response message includes DIGESTS, CERTIFICATE, CHALLENGE_AUTH, and ERROR.

[0413] -DIGESTS: The wireless power transmitter 100 can send the certificate chain summary using the DIGESTS response and report the slots containing the valid certificate chain summary.

[0414] -CERTIFICATE: This response can be used for the wireless power transmitter 100 to send the requested segment of the certificate chain.

[0415] -CHALLENGE_AUTH: The wireless power transmitter 100 can use CHALLENGE_AUTH to respond to a CHALLENGE request.

[0416] -ERROR: This response can be used for the power transmitter to send error information.

[0417] The authentication message may also be referred to as an authentication packet, and may also be referred to as authentication data or authentication control information. Also, messages such as GET_DIGEST and DIGESTS may also be referred to as GET_DIGEST packets, DIGEST packets, etc.

[0418] On the other hand, as described above, the wireless power receiver 200 and the wireless power transmitter 100 can transmit application-level data via a data transmission stream. The application-level data transmitted via the data transmission stream can be composed of a sequence of data packets with the following structure.

[0419] -Initial ADC data packet for opening the stream.

[0420] i) Message types included in the stream.

[0421] ii) Number of data bytes in the stream.

[0422] -Series of ADT data packets containing the actual message.

[0423] -Final ADC / end data packet for closing the stream.

[0424] Hereinafter, a data transmission stream for an example in which the above ADC, ADT, and ADC / end data packets are used will be described through the drawings.

[0425] FIG. 16 shows an application-level data stream between a wireless power transmission device 100 and a wireless power reception device 200 according to an example.

[0426] Referring to FIG. 16, the data stream may include an auxiliary data control (ADC) data packet and / or an auxiliary data transport (ADT) data packet.

[0427] The ADC data packet is used to start (opening) the data stream. The ADC data packet can indicate the type of the message included in the stream and the number of data bytes. On the other hand, the ADT data packet is a sequence of data including the actual message. When notifying the end of the stream, an ADC / end data packet is used. For example, the maximum number of data bytes in the data transmission stream may be limited to 2047.

[0428] To notify whether the ADC data packet and the ADT data packet are received normally, ACK or NAC (NACK) is used. Between the transmission timings of the ADC data packet and the ADT data packet, control information necessary for wireless charging, such as a control error packet (CE) or DSR, may be transmitted.

[0429] Using such a data stream structure, authentication-related information or other application-level information may be transmitted and received between the wireless power transmission device and the reception device.

[0430] To explain the above-described example for understanding the operation between the wireless power transmission device 100 and the wireless power reception device 200 in the power transmission phase 840, it is as follows.

[0431] FIG. 17 shows a power control method according to an embodiment.

[0432] In Fig. 17, in the power transmission phase, the wireless power transmission device 100 and the wireless power reception device 200 can control the amount of power transmitted by performing communication in parallel with power transmission and reception. The wireless power transmission device and the wireless power reception device operate at a specific control point. The control point indicates a combination of voltage and current provided at the output end of the wireless power reception device when power transmission is executed.

[0433] More specifically, the wireless power reception device selects a desired control point - desired output current / voltage, temperature at a specific position of the mobile device, etc., and additionally determines the actual control point currently in operation. The wireless power reception device uses the desired control point and the actual control point to calculate a control error value, which can be transmitted to the wireless power transmission device as a control error packet.

[0434] Then, the wireless power transmission device can use the received control error packet to set / control a new operating point - amplitude, frequency, and duty cycle - to control power transmission. Therefore, the control error packet is transmitted / received at regular time intervals during the power transmission stage. As an example, when the wireless power reception device attempts to reduce the current of the wireless power transmission device, it can set the control error value to a negative number, and when attempting to increase the current, it can set the control error value to a positive number and transmit it. In this way, in the inductive mode, the wireless power reception device can control power transmission by transmitting a control error packet to the wireless power transmission device.

[0435] In the resonance mode, it may operate in a different manner from the inductive mode. In the resonance mode, one wireless power transmission device needs to serve multiple wireless power reception devices simultaneously. However, when controlling power transmission as in the inductive mode described above, since the transmitted power is controlled by communication with one wireless power reception device, it may be difficult to control power transmission to additional wireless power reception devices. Therefore, in the resonance mode of this specification, the wireless power transmission device attempts to use a method in which it commonly transmits basic power and the wireless power reception device controls the amount of received power by controlling its own resonance frequency. However, even in such an operation of the resonance mode, the method described in FIG. 17 is not completely excluded, and additional transmitted power control may be performed by the method of FIG. 17.

[0436] <Operation related to profile>

[0437] Wireless charging methods include a magnetic induction method that uses the magnetic induction phenomenon between a primary coil and a secondary coil, and a magnetic resonance method that transmits power by performing magnetic resonance using a frequency in the range of several tens of kHz to several MHz bands. Here, the wireless charging standard for the magnetic resonance method is led by an association called A4WP, and the magnetic induction method is led by the standard in the Wireless Power Consortium (WPC). Here, in the WPC, it is designed to be able to transmit and receive various state information and commands related to the wireless charging system in-band.

[0438] The standard in the WPC defines a baseline power profile (BPP) and an extended power profile (EPP). Hereinafter, the BPP and EPP will be described respectively.

[0439] A. BPP (baseline power profile)

[0440] BPP relates to the power transfer profile between a wireless power transmitter and a receiver that supports power transmission up to 5W. And in BPP, unidirectional communication from the wireless power receiver to the wireless power transmitter is supported. The communication method at this time can correspond to ASK (amplitude shift keying). In BPP, there are protocol phases of Ping, setting, and power transfer.

[0441] B.EPP (extended power profile)

[0442] EPP relates to the power transfer profile between a wireless power transmitter and a receiver that supports power transmission up to 15W. And in EPP, bidirectional communication between the wireless power receiver and the wireless power transmitter is supported. The communication method from the wireless power receiver to the wireless power transmitter can correspond to ASK (amplitude shift keying), and the communication method from the wireless power transmitter to the wireless power receiver can correspond to FSK (frequency shift keying). In EPP, there are protocol phases of Ping, setting, negotiation, and power transfer.

[0443] (a) Compatibility in EPP

[0444] EPP can correspond to the upper profile of BPP.

[0445] For example, if a BPP wireless power receiver is placed on an EPP wireless power transmitter, the EPP wireless power transmitter can operate as a BPP wireless power transmitter.

[0446] For example, if an EPP wireless power receiver is placed on a BPP wireless power transmitter, the EPP wireless power receiver can operate as a BPP wireless power receiver.

[0447] That is, EPP can maintain compatibility with BPP.

[0448] (b) EPP Instruction Method for EPP Wireless Power Receiver

[0449] The EPP wireless power receiver can indicate that it is an EPP wireless power receiver by setting the "neg" bit to 1 in the configuration packet (i.e., CFG). Specific examples for the configuration packet are as described above.

[0450] (c) EPP Instruction Method for EPP Wireless Power Transmitter

[0451] When the EPP wireless power transmitter receives a configuration packet with the "neg" bit set to 1 from the wireless power receiver, the EPP wireless power transmitter can respond to this with an ACK FSK bit pattern to the wireless power receiver.

[0452] For reference, as described above, since the BPP wireless power transmitter does not support the FSK communication method, the BPP wireless power transmitter cannot transmit an FSK bit pattern. Accordingly, the EPP wireless power receiver that transmits a configuration packet with the "neg" bit set to 1 to the BPP wireless power transmitter cannot receive the above ACK response, and thus can identify that the counterpart wireless power transmitter is a BPP wireless power transmitter.

[0453] On the other hand, in the wireless power transmission system, an attempt is made to provide a new power transmission profile, and among the proposed power transmission profiles, there is an MPP (magnetic power profile). MPP can be compatible with the proprietary extension of "Apple" based on Qiv1.3.0.

[0454] C. MPP (magnet power profile)

[0455] MPP relates to the power transfer profile between a wireless power transmitter and a receiver that supports power transmission up to 15W. And in MPP, bidirectional communication between the wireless power receiver and the wireless power transmitter is supported. The communication method from the wireless power receiver to the wireless power transmitter can correspond to ASK (amplitude shift keying), and the communication method from the wireless power transmitter to the wireless power receiver can correspond to FSK (frequency shift keying). At this time, fast FSK (NCYCLE = 128) can be used between the negotiation and power transfer phases.

[0456] In MPP, there are protocol phases of Ping, setting, MPP negotiation, and MPP power transfer.

[0457] (a) Compatibility in MPP

[0458] MPP can correspond to the upper profile of BPP.

[0459] For example, if a BPP wireless power receiver is placed on an MPP wireless power transmitter, the MPP wireless power transmitter can operate as a BPP wireless power transmitter.

[0460] For example, if an MPP wireless power receiver is placed on a BPP wireless power transmitter, the MPP wireless power receiver can operate as a BPP wireless power receiver.

[0461] That is, MPP can maintain compatibility with BPP.

[0462] (b) MPP operation of the MPP wireless power receiver (MPP indication method)

[0463] The MPP wireless power receiver can use a specific MPP indicator in the extended ID packet.

[0464] In order for the MPP wireless power receiver to notify the availability of MPP support via XID, the wireless power receiver needs to inform the wireless power transmitter that the XID is transmitted via the ID packet. The ID packet that the MPP wireless power receiver comes to transmit can be as follows.

[0465] Figure 18 schematically shows the structure of the MPP ID packet.

[0466] According to Figure 18, in the MPP ID packet, the value of the major version field from b4 - b7 of B0 can be set to 1.

[0467] In the MPP ID packet, the value of the minor version field from b0 - b3 of B0 can be a value to be determined later.

[0468] In the MPP ID packet, the values of the manufacture codes of B1 and B2 can be assigned to the PRMC code.

[0469] In the MPP ID packet, the value of the "ext" field of b7 of B3 can be set to 1 to indicate that an additional XID packet is transmitted.

[0470] In the MPP ID packet, the values of the random identifier fields from b0 to b6 of B3, B4, and from b3 to b7 of B5 can be set according to the random device identification policy.

[0471] Figure 19 schematically shows an example of the XID packet in MPP.

[0472] According to Figure 19, the XID packet in MPP can include a "XID Selector" field, a "Restricted" field, a "Freq Mask" field, etc.

[0473] Here, whether the MPP is supported can be determined according to whether the value of the "XID Selector" is 0xFE. That is, when the value of B_0 of the XID is 0xFE, the XID at this time can correspond to information indicating that the wireless power receiver supports MPP.

[0474] The "Restricted" field can correspond to information indicating whether the wireless power receiver operates in the MPP restricted mode or the MPP full mode. If the wireless power receiver selects to operate in the MPP restricted mode, the said field can be set to 1. On the other hand, in other cases (for example, when the wireless power receiver selects not to operate in the MPP restricted mode), the said field can be set to 0.

[0475] The "Preferred Frequency" field can mean the preferred frequency of MPP. Here, when the wireless power receiver tries to search for information from the wireless power transmitter before frequency switching (in the negotiation phase), this field can be set to 128 kHz. Otherwise, the wireless power receiver can set this field to 360 kHz.

[0476] The "Freq Mask" field can correspond to a field for determining whether the operating frequency of 360 kHz is supported. That is, when the "FreqMask" field is set to 0, 360 kHz is supported.

[0477] In summary, by determining whether the "ext" bit of the ID received by the wireless power transmitter from the wireless power receiver is set to 1 and whether B_0 of the XID is set to 0xFE, the wireless power transmitter can determine whether the wireless power receiver supports MPP.

[0478] (c) MPP operation of the MPP wireless power transmitter (MPP indication method)

[0479] After detecting the placement of the wireless power receiver on the charging surface, the MPP wireless power transmitter can use the information contained in the ID and XID packets to perform a digital Ping to identify the receiver.

[0480] Here, if all of the following conditions are met, the wireless power transmitter can determine that the wireless power receiver supports MPP.

[0481] - Qi version: The Qi protocol version in the ID packet is set to (Major = 1, Minor = TBD) or higher.

[0482] - Notification of MPP support: The lower header (byte 0) of the XID packet is set to the MPP selector.

[0483] If the above two conditions are not met, the wireless power transmitter can proceed with the subsequent steps according to the Qi v1.3 specification.

[0484] On the other hand, according to the MPP operating mode requested by the MPP wireless power receiver in the XID packet, the wireless power transmitter performs the following.

[0485] - Restricted profile activation (MPP restricted mode): When the "restricted" flag is set to 1.

[0486] - Full profile activation (MPP full mode): When the "restricted" flag is set to 0.

[0487] Specific examples for the above - mentioned restricted profile and full profile will be described later.

[0488] On the one hand, when the MPP wireless power transmitter receives a setting packet from the wireless power receiver with the "neg" bit set to 1, (in MPP full mode) the MPP wireless power transmitter can respond to this with an MPP ACK FSK bit pattern to the wireless power receiver (in MPP full mode).

[0489] For reference, since the MPP restricted mode wireless power transmitter does not support the FSK communication method, the MPP restricted mode wireless power transmitter cannot transmit an FSK bit pattern. However, since the MPP restricted mode wireless power transmitter uses an operating signal of 360 kHz for power transmission, for this, the MPP wireless power receiver that sets the "neg" bit to 1 and transmits the setting packet to the wireless power transmitter operating in MPP restricted mode can identify that the counterpart wireless power transmitter is the MPP restricted mode wireless power transmitter via the operating frequency.

[0490] (d) MPP mode

[0491] On the one hand, there are two modes in MPP. One of them is the MPP restricted mode (MPP Restricted mode) (or, MPP baseline profile), and the remaining one is the MPP full mode (MPP Full mode) (or, MPP full profile).

[0492] To briefly explain the difference between the two, in the MPP restricted mode, the "restricted" field in the XID is set to 1, while in the MPP full mode, the "restricted" field in the XID is set to 0.

[0493] Also, FSK communication is not supported in the MPP restricted mode, while FSK communication is supported in the MPP full mode.

[0494] Furthermore, in the MPP restricted mode, FSK communication is not supported, so an MPP ACK for CFG cannot be sent. As a result, MPP negotiation is not supported in the MPP restricted mode. In contrast, in the MPP full mode, FSK communication is supported, so an MPP ACK for CFG can be sent, and thus MPP negotiation is supported in the MPP full mode.

[0495] The MPP restricted mode and the MPP full mode will be described in more detail below. Here, the MPP restricted mode can be used in combination with the MPP baseline profile, and the MPP full mode can be used in combination with the MPP full profile.

[0496] In order to have a more comprehensive understanding of the MPP restricted mode and the MPP full mode, the protocols in each mode will be described in more detail below.

[0497] i) MPP Restricted mode

[0498] As described above, FSK communication is not supported in the MPP restricted mode. That is, there may be no data packets transmitted from the wireless power transmitter to the wireless power receiver in the MPP restricted mode. Against this background, the protocol in the MPP restricted mode will be described with reference to the drawings.

[0499] FIG. 20 schematically shows the protocol in the MPP restricted mode.

[0500] According to FIG. 20, the wireless power receiver can transmit a SIG to the wireless power transmitter on a first operating frequency (for example, 128 kHz). At this time, the first operating frequency can correspond to an operating frequency at which BPP and / or EPP can be executed. And the first operating frequency at this time can correspond to the frequency driven by the wireless power transmitter.

[0501] The wireless power receiver can transmit an ID packet to the wireless power transmitter at a first operating frequency. At this time, since XID is always transmitted in MPP, the "ext" bit of the ID can be set to 1 so that it can be indicated that XID is to be transmitted additionally.

[0502] The wireless power receiver can transmit an XID packet to the wireless power transmitter at a first operating frequency.

[0503] The value of B0 in the XID at this time is 0xFE. If the value of B0 in the XID is set to 0xFE, this can correspond to information indicating that the wireless power receiver supports MPP. Also, the "restricted" field in the XID at this time can be set to 1 so that it can indicate that the wireless power receiver operates in the MPP restricted mode.

[0504] Here, when the wireless power transmitter receives the above XID packet indicating the MPP restricted mode, the wireless power transmitter can remove the power signal and restart the Ping phase at a new operating frequency.

[0505] If the Ping phase is restarted, the wireless power receiver will start again from the transmission of SIG. However, the operating frequency at this time can be a second operating frequency (for example, 360 kHz).

[0506] Thereafter, the wireless power receiver transmits an ID packet, an XID packet, and a CFG packet to the wireless power transmitter at the second operating frequency respectively. Also, the wireless power receiver can receive wireless power based on the MPP baseline from the wireless power transmitter by transmitting CEP to the wireless power transmitter.

[0507] ii) MPP Full mode

[0508] As described above, FSK communication is supported in the MPP full mode. That is, there are data packets transmitted from the wireless power transmitter to the wireless power receiver in the MPP full mode. In other words, MPP negotiation and the like can be carried out between the wireless power transmitter and the wireless power receiver. Against such a background, the protocol in the MPP full mode will be described with reference to the drawings.

[0509] FIG. 21 and FIG. 22 schematically show the protocol in the MPP full mode.

[0510] First, according to FIG. 21, the wireless power receiver can transmit a SIG to the wireless power transmitter on a first operating frequency (for example, 128 kHz). At this time, the first operating frequency can correspond to an operating frequency at which BPP and / or EPP can be executed. And the first operating frequency at this time can correspond to the frequency at which the wireless power transmitter is driven.

[0511] The wireless power receiver can transmit an ID packet to the wireless power transmitter on the first operating frequency. At this time, since XID is always transmitted in MPP, the "ext" bit of the ID can be set to 1 so as to be able to indicate that XID is further transmitted.

[0512] The wireless power receiver can transmit an XID packet to the wireless power transmitter on the first operating frequency.

[0513] The value of B0 in the XID at this time is 0xFE. If the value of B0 in the XID is set to 0xFE, this can correspond to information indicating that the wireless power receiver supports MPP. Also, the "restricted" field in the XID at this time can be set to 0 so as to be able to indicate that the wireless power receiver operates in the MPP full mode.

[0514] On the one hand, in the MPP full mode, unlike the MPP restriction mode, even if the wireless power transmitter receives an XID packet from the wireless power receiver, it does not remove the power signal. At this time, since the power signal is still not removed, the wireless power receiver transmits a CFG packet to the wireless power transmitter after the XID packet.

[0515] Then, as a response to the above CFG packet, the wireless power receiver can receive an MPP ACK from the wireless power transmitter.

[0516] The wireless power receiver that has received the MPP ACK enters the negotiation phase with the wireless power transmitter, and both the wireless power receiver and the wireless power transmitter can proceed with the negotiation.

[0517] After proceeding with the negotiation, the wireless power receiver can enter the power transmission phase with the wireless power transmitter.

[0518] On the other hand, the wireless power receiver transmits an EPT packet to the wireless power transmitter. The wireless power transmitter that has received the EPT packet removes the power signal and can then restart the Ping phase at a new operating frequency.

[0519] According to FIG. 22, if the Ping phase is restarted, the wireless power receiver will start transmitting the SIG again. However, the operating frequency at this time can be the second operating frequency (for example, 360 kHz).

[0520] After that, the wireless power receiver transmits an ID packet, an XID packet, and a CFG packet to the wireless power transmitter at the second operating frequency respectively. Then, the wireless power receiver can receive an MPP ACK from the wireless power transmitter.

[0521] The wireless power receiver that has received the MPP ACK enters the negotiation phase with the wireless power transmitter at the second operating frequency, and both the wireless power receiver and the wireless power transmitter can proceed with the negotiation.

[0522] After proceeding with the negotiation, the wireless power receiver enters the power transfer phase with the wireless power transmitter at the second operating frequency. At the same time, the wireless power receiver can transmit XCE to the wireless power transmitter and receive a response thereto (e.g., receive an ACK) to receive wireless power based on the MPP full mode from the wireless power transmitter.

[0523] Hereinafter, a more specific description will be given with respect to this specification.

[0524] As described above, in the wireless power transmission system, the format of the data transport stream capable of transmitting and receiving the application level data stream between the wireless power transmitter and the wireless power receiver is defined.

[0525] At this time, the format of the data transport stream (in other words, the data stream) is defined in the following packets.

[0526] - Initial ADC data packet for opening the stream

[0527] Here, the ADC data packet can indicate the type of the message included in the stream.

[0528] And the ADC data packet can indicate the number of data bytes included in the stream.

[0529] - Sequence of ADT data packets including the actual message

[0530] - Final ADC / end data packet for closing the stream

[0531] Alternatively, in relation to the data transport stream transmission, the following packets are defined.

[0532] - Regarding the data stream: ADC and / or ADT (wireless power transmitter and wireless power receiver)

[0533] - Regarding the response to ADC and ADT: DSR (wireless power receiver), ACK / NAK / ND / ATN (wireless power transmitter)

[0534] Here, ADC is a packet sent by the wireless power transmitter, and ADC can also be a packet sent by the wireless power receiver. As an example, a more specific description of the ADC packet of the wireless power transmitter is as follows.

[0535] Figure 23 schematically shows an example of an ADC packet.

[0536] According to Figure 23, the ADC data packet can control the data transmission stream to the power receiver. At this time, the ADC packet can include a request field and a parameter field. And each of the fields at this time can be as follows.

[0537] [[ID=!20]]- Request field: Any one of the following values can be set.

[0538] 0 - ADC / end: Close the data transmission stream going out to the wireless power receiver.

[0539] 2 - ADC / auth: Open the authentication data transmission stream to the wireless power receiver.

[0540] 5 - ADC / rst: Reset all incoming and outgoing data transmission streams.

[0541] 0x10...0x1F - ADC / prop: Open the exclusive data transmission stream to the wireless power receiver.

[0542] And the parameter field can be as follows.

[0543] It should be noted that there may be an error in the original text where the line number "!20" seems incorrect. It should probably be "20". This has been translated as accurately as possible based on the existing text. - Parameter field: For the exclusive (ADC / prop) and authentication (ADC / auth) data transmission streams, it is the number of data bytes in the stream. It can be set to 0 for all other ADC data packets.

[0544] Subsequent DSR data packets can be as follows.

[0545] - DSR / ack: The radio power receiver has executed the request successfully.

[0546] - DSR / nak: The radio power receiver did not execute the request because the receive and / or transmit data transmission stream is already open or in use.

[0547] - DSR / nd (open data transmission stream): The radio power receiver does not support the requested data transmission stream type.

[0548] - DSR / nd (reserved Request value): The radio power receiver does not support the request.

[0549] - DSR / poll: The radio power receiver did not receive the last power transmitter data packet.

[0550] In other words, DSR / poll is a packet sent by the radio power receiver to the radio power transmitter. DSR / poll can mean allowing the radio power transmitter to send any packet (subsequent to an already sent packet or a packet about to be sent). That is, as described above, DSR / poll can invite the radio power transmitter to send any data packet.

[0551] On the other hand, ADT is also a packet sent by the radio power transmitter and can also be a packet sent by the radio power receiver. As an example, a more specific description of the ADT packet of the radio power transmitter is as follows.

[0552] FIG. 24 schematically shows an example of an ADT packet.

[0553] According to FIG. 24, the ADT data packet transmits the application data of the data transmission stream to the power receiver. Here, the ADT data packet sizes from 1 to 7 can be used.

[0554] At this time, the ADT data packet for each size can be used together with odd and even headers. For example, when assuming that the size of the ADT data packet is 7 bytes, there are a 7-byte ADT data packet with an odd header and a 7-byte ADT data packet with an even header respectively.

[0555] Here, the ADT packet can include a data field, and the data field can be as follows.

[0556] - Data field: Can be appropriately defined by the application layer.

[0557] The subsequent DSR data packet can be as follows.

[0558] - DSR / ack: The radio power receiver has appropriately processed the data of the packet.

[0559] - DSR / nak: The radio power receiver has received the last power transmitter data packet but cannot process the data of the packet. For example, the radio power receiver can use the response when it is busy or cannot buffer the data.

[0560] - DSR / nd: The radio power receiver cannot have an incoming data transport stream open.

[0561] - DSR / poll: The radio power receiver has not received the last power transmitter data packet.

[0562] In other words, DSR / poll is a packet that a wireless power receiver sends to a wireless power transmitter. DSR / poll can be meant to permit the wireless power transmitter to send any packet (subsequent to a packet already sent or a packet about to be sent). That is, as described above, DSR / poll can invite the wireless power transmitter to transmit any data packet.

[0563] On the other hand, a data transport stream (hereinafter, TPL) can be divided into an initiator and a responder regardless of the wireless power receiver / wireless power transmitter.

[0564] At this time, the data transfer stream and the packets related thereto will be described with reference to the drawings regarding the content exchanged between the initiator and the responder.

[0565] FIG. 25 schematically shows an example in which an application message is transmitted from a data stream initiator to a data stream responder.

[0566] According to FIG. 25, the initiator sends a data message to the responder.

[0567] More specifically, for a specific application (for example, authentication), the initiator sends an application request message.

[0568] Therefore, the data stream initiator can first create an application-related request message in the application layer and store it in a buffer. Then, the data stream initiator can transmit the request message in the buffer to the transport layer and store it in the local buffer. In the transport layer of the data stream initiator, after the application request message stored in the local buffer is sliced according to the ADT size, it can be transmitted to the data stream responder via the data stream.

[0569] Whenever the data stream responder receives the sliced application request message from the initiator via the ADT or the like, the data stream responder can execute a response (ACK / NAK / ND). Then, the data stream responder can store the received sliced message in its local buffer in an overlapping manner.

[0570] When the data stream initiator has sent all the application request messages and closes the data stream, it can give feedback to its own application layer. Then, after the data stream responder has completed the received application request message, it can transmit it to the application layer of the data stream responder.

[0571] If the application request message is transmitted to the application layer of the data stream responder through such a process, the data stream initiator can respond to the completion of the transmission of the application request message. And the data stream responder can respond to the completion of receiving the application request message.

[0572] Thereafter, the positions of the data stream initiator and the data stream responder are swapped. That is, the new data stream initiator can transmit an application response message (for the application request message) to the new data stream responder. And the transmission process of the application response message can just repeat the process described above (that is, the new data stream initiator slices the application response message and transmits it to the new data stream responder via a data stream (such as an ADT, etc.)).

[0573] Here, an example of the process as described above, that is, the existing data stream initiator is converted into a new data stream responder, and the existing data stream responder is converted into a new data stream initiator, can be described as follows from the application perspective with reference to the drawings.

[0574] Figure 26 schematically shows a sequence diagram for data transmission from the application perspective.

[0575] According to Figure 26, the data stream initiator can send an (application) request message to the data stream responder. At this time, the method by which the data stream initiator sends an (application) request message to the data stream responder is as described above. That is, as shown in Figure 25, the data stream initiator can slice the request message and send it to the data stream responder via a data stream (such as an ADT packet, etc.).

[0576] Thereafter, the data stream responder that has received the (application) request message is newly converted into a data stream initiator. That is, if the data stream responder receives the final ADC packet, which is a packet for closing the data stream related to the application request message from the data stream initiator, the data stream responder can be converted into a data stream initiator.

[0577] Thereafter, the new data stream initiator can send an application response message to the existing data stream initiator via a data stream (such as an ADT packet). At this time, the existing data stream initiator can become a new data stream responder.

[0578] On the other hand, since the wireless power transmission system is a system that focuses on the development of wireless power transmission, various problem situations can occur in the data communication between the wireless power transmitter and the wireless power receiver.

[0579] An example of the problem situations that can occur when data communication (i.e., TPL communication) between the wireless power transmitter and the wireless power receiver is executed is sorted out and explained as follows.

[0580] - During TPL communication, when the initiator (wireless power transmitter or wireless power receiver) and / or the responder (wireless power receiver or wireless power transmitter) cannot store the Data sent / received for the Data (for example, the memory stack is stuck).

[0581] - During TPL communication, when the communication synchronization between the two is not achieved and the initiator and / or the responder are waiting for the response from the other party.

[0582] -During TPL communication, when inband communication cannot be executed due to charging control-related operations and the inband communication is stuck.

[0583] -During TPL communication, when communication between the initiator and / or responder cannot proceed further due to an unknown error.

[0584] -During TPL communication, when a problem occurs in the transport layer buffer and TPL progress is impossible.

[0585] -Others.

[0586] Here, when the above-mentioned problems occur while the wireless power transmitter and / or wireless power receiver is performing data communication with the other party, it is preferable for the wireless power transmitter and / or wireless power receiver to reset or forcibly terminate (in other words, abort) this data communication.

[0587] For example, when the above-mentioned problems occur and it becomes difficult to transmit and receive data streams any further while at least one data stream is open, the wireless power transmitter and / or wireless power receiver can attempt to reset the data stream.

[0588] As one way to implement this, the wireless power transmitter and / or wireless power receiver can send information regarding the reset to the other party to close all data streams. However, such a method corresponds to a method that does not consider multi-data streams.

[0589] As an example, when a problem occurs in data storage / communication during the progress of various application data streams (for example, Stream 1: authentication; Stream 2: configuration; Stream 3: BMS) (or when a problem occurs in the transport layer), other streams excluding the corresponding stream where the problem occurred (assuming, for example, that a problem occurred in Stream 2) (Stream 1 and Stream 3) may be problem-free.

[0590] If the above-described implementation method is applied in this case to execute a reset, a reset can also be executed for other streams that are not problematic (for example, Stream 1 and Stream 3). In this case, the wireless power transmitter and / or the wireless power receiver must re-execute all data communications from the beginning up to the streams that are not problematic. This can be considered an inefficient method.

[0591] Also, for example, when at least one data stream is open and the above-described problem occurs, making it difficult to send and receive data from more data streams, the wireless power transmitter and / or the wireless power receiver can attempt to execute a forced termination rather than a reset of the data stream.

[0592] As an example, during the execution of data communication between the wireless power transmitter and / or the wireless power receiver, a problem as described above may occur, and a request for a reset of the data communication may be made to the other party, but a case where the reset of the data communication fails may occur. In such a case, since it corresponds to a situation where it is impossible to execute data communication with the other party any further, the wireless power transmitter and / or the wireless power receiver can attempt to execute a forced termination of the data communication rather than a reset of the data stream.

[0593] However, in the case of the current technology, since a configuration for forced termination of data communication is not provided, it is impossible for the wireless power transmitter and / or the wireless power receiver to forcibly terminate data communication as described above.

[0594] Therefore, this specification aims to provide a method for resetting a data stream and an apparatus using the same. Moreover, this specification aims to provide a method for forcibly terminating (aborting) a data stream and an apparatus using the same.

[0595] 1. Reset of Data Stream

[0596] The following drawings are created to illustrate a specific example of this specification. Since the names of specific apparatuses and the names of specific signals / messages / fields described in the drawings are presented by way of example, the technical features of this specification are not limited to the specific names used in the following drawings.

[0597] FIG. 27 is a flowchart of a method for a wireless power transmitter to transmit wireless power according to an embodiment of this specification.

[0598] According to FIG. 27, the wireless power transmitter can enter (S2710) a power transmission phase related to transmitting wireless power.

[0599] As described above, the wireless power transmitter that has entered the power transmission phase can transmit power to the wireless power receiver. And the wireless power receiver can perform power control by periodically transmitting CE packets to the wireless power transmitter. Also, the wireless power transmitter can perform FOD during power transmission by receiving RP packets from the wireless power receiver. Since specific descriptions of these are as described above, repeated descriptions are omitted.

[0600] Moreover, the wireless power transmitter and / or the wireless power receiver can transmit a data stream to the other party from the position of a data stream initiator.

[0601] That is, the wireless power transmitter can transmit a data stream to the wireless power receiver, or the wireless power transmitter can receive a data stream from the wireless power receiver (S2720). At this time, the data stream can include an initial ADC packet, at least one ADT packet, and a final ADC packet. And the initial ADC packet can correspond to a packet related to the opening of the data stream, and the final ADC packet can correspond to a packet related to the closing of the data stream.

[0602] On the other hand, while the data stream is being transmitted as described above, the wireless power transmitter and / or the wireless power receiver can transmit reset information to the other party (S2730). That is, the wireless power transmitter can transmit reset information to the wireless power receiver regardless of whether it is a data stream initiator or a responder. Moreover, the wireless power receiver can transmit reset information to the wireless power transmitter regardless of whether it is a data stream initiator or a responder.

[0603] Thereafter, the wireless power transmitter and / or the wireless power receiver can execute initialization of the data stream (S2740).

[0604] Here, even though the wireless power transmitter and / or the wireless power receiver initialize the data stream, the opening of the data stream can be maintained. That is, even if the data stream is reset and the data stream is transmitted again, the wireless power transmitter and / or the wireless power receiver can immediately transmit the first ADT packet to the other party without transmitting a separate initial ADC to the other party (that is, without a separate data stream opening).

[0605] However, when reset information is transmitted as described above, the opening of the data stream is not maintained. When reset information is transmitted, the data stream is tentatively closed and the data stream is retransmitted from the beginning (as long as they are not mutually incompatible), and the embodiments of this specification can be applied.

[0606] The following will describe this specification in more detail. For the convenience of understanding below, an example will be described based on the case where a wireless power transmitter transmits a data stream to a wireless power receiver and the wireless power transmitter transmits reset information to the wireless power receiver. However, the examples described below are examples for facilitating the understanding of the specification, and the following exemplifications are also applicable to the exemplification where a wireless power transmitter transmits a data stream to a wireless power transmitter. Also, the following exemplifications are also applicable to the exemplification where a wireless power receiver transmits reset information to a wireless power transmitter.

[0607] The following drawings are created to illustrate a specific example of this specification. Since the names of the specific devices described in the drawings and the names of the specific signals / messages / fields are presented by way of example, the technical features of this specification are not limited to the specific names used in the following drawings.

[0608] FIG. 28 is a flowchart of a method for a wireless power transmitter to transmit wireless power according to another embodiment of this specification.

[0609] According to FIG. 28, the wireless power transmitter can enter (enter) a power transmission phase related to transmitting the wireless power (S2810).

[0610] Thereafter, the wireless power transmitter can transmit a first data stream to the wireless power receiver during the power transfer phase (S2820). At this time, the first data stream can include an initial ADC (auxiliary data control) packet related to the opening of the first data stream, at least one ADT (auxiliary data transport) packet, or a final ADC packet related to the closing of the first data stream.

[0611] The wireless power transmitter can send reset information indicating a reset of the first data stream to the wireless power receiver (S2830). At this time, the reset information can correspond to a type of ADC packet. Or, the reset information can also correspond to a packet newly defined separately from ADC and ADT. Specific examples of the reset information will be described later.

[0612] The wireless power transmitter can receive a response to the reset information from the wireless power receiver (S2840). At this time, when the wireless power transmitter sends the reset information to the wireless power receiver via a type of ADC packet (or a newly defined packet), the response received by the wireless power transmitter from the wireless power receiver can correspond to a DSR / ack packet.

[0613] In contrast, different from this drawing, when the wireless power receiver sends the reset information to the wireless power transmitter via a type of ADC packet (or a newly defined packet), the response received by the wireless power receiver from the wireless power transmitter can correspond to an ACK response (for example, a type of bit pattern).

[0614] Thereafter, the wireless power transmitter can execute a reset of the first data stream based on receiving the response (S2850).

[0615] Here, before and after reset, the opening of the first data stream can be maintained. More specifically, after reset, the wireless power transmitter can transmit the first data stream to the wireless power receiver from the beginning. Here, since the opening of the first data stream is maintained, after reset, the wireless power transmitter can transmit at least one ADT packet to the wireless power receiver without transmitting the initial ADC packet.

[0616] Of course, on the contrary, as described above, after reset, the first data stream can be temporarily closed, and later, the first data stream can be opened again (i.e., the initial ADC packet is transmitted).

[0617] On the other hand, the embodiments herein can also be applied to multi-streams. That is, it can also be applied when the wireless power transmitter transmits the second data stream to the wireless power receiver while transmitting the first data stream. In this case, based on the wireless power transmitter receiving a response to the reset information from the wireless power receiver, the wireless power transmitter can execute the reset of the first data stream without executing the reset of the second data stream.

[0618] That is, the wireless power transmitter and / or the wireless power receiver can reset only the data stream targeted by the reset information. For this purpose, the reset information can include information for identifying the first data stream.

[0619] Here, executing a reset can mean that the wireless power transmitter discards the data stored below the transport layer based on executing the reset. Explaining this with reference to the drawings is as follows.

[0620] Figure 29 schematically shows the concept of reset of a data stream.

[0621] According to FIG. 29, when a data communication in - transit reset is executed, a wireless power transmitter and / or a wireless power receiver (or a data stream initiator and / or a data stream responder) can discard all the data in the transport layer / buffer including incoming / outgoing data. Here, even in this case, the application layer can be saved as it is.

[0622] As an example, during data communication for the #1, #2, and #3 application data streams, when the #2 data stream is reset based on ADC / reset_#2, the wireless power transmitter and / or the wireless power receiver can delete the data in the local buffer that communicated in the #2 - corresponding stream and / or the incoming and outgoing data to execute the reset. However, even in this case, the wireless power transmitter and / or the wireless power receiver can proceed with data communication with the stream still open.

[0623] (1) Example of the structure of reset information

[0624] On the other hand, the reset information is in the form of an ADC packet, and the reset information is a new packet form that did not exist conventionally as described above.

[0625] Here, when the reset information has, for example, the form of an ADC packet, it is as described in the following drawings.

[0626] FIG. 30 schematically shows an example of the reset information.

[0627] According to FIG. 30, the reset information can have the form of a kind of ADC packet. That is, the reset information can include a request field and a parameter field like other ADC packets. And in addition to this, the reset information can include an application stream number field.

[0628] Each field is illustrative and is as follows:

[0629] -Reqeust:5-ADC / rst

[0630] -Parameter: Describe the application stream information that desires reset

[0631] -Application stream number: With the addition of B2, separately describe the stream that desires reset

[0632] (2) Exemplary flowchart for transmitting reset information

[0633] To describe the above examples more specifically through a specific flowchart, it is as follows:

[0634] When data communication occurs between wireless charging devices, there may be cases where the wireless power receiver and / or the wireless power transmitter should reset the data communication due to unrecoverable communication errors and other communication errors.

[0635] In such cases, a configuration is provided that enables reset for each application stream, and through this configuration, a reset can be executed for a specific stream. At this time, the wireless power receiver and / or the wireless power transmitter can discard all the data stored in the local buffer that has been exchanged so far and / or the incoming and outgoing data.

[0636] In such cases, the corresponding application stream for which the reset is executed is initialized, but the stream can be maintained in an open state. That is, after the reset, data communication can be executed again from the beginning.

[0637] For example, in the case of a data stream from a wireless power receiver to a wireless power transmitter, after resetting the corresponding stream, the wireless power transmitter and / or the wireless power receiver can directly proceed with the data stream from the wireless power receiver to the wireless power transmitter as it is. In other words, the data stream is not terminated.

[0638] First, an example of the wireless power transmitter sending reset information to the wireless power receiver will be described.

[0639] FIG. 31 schematically shows an example of the wireless power transmitter sending reset information.

[0640] According to FIG. 31, during the process of the wireless power transmitter sending a data stream to the wireless power receiver, the wireless power transmitter can send reset information (for example, an ADC packet instructing to reset stream #3, that is, ADC / reset / steram#3) to the wireless power receiver. Here, although the example in FIG. 31 illustrates the case where the wireless power transmitter sends a data stream to the wireless power receiver, the example in FIG. 31 can also be applied when the wireless power receiver sends a data stream to the wireless power transmitter.

[0641] When the wireless power transmitter sends reset information to the wireless power receiver, after receiving the reset packet of the corresponding stream from the wireless power transmitter, the wireless power receiver can perform reset and local buffer clear of incoming and / or outgoing data. Thereafter, the wireless power receiver can send DSR / ack to the wireless power transmitter.

[0642] The wireless power transmitter sends a reset packet corresponding to the stream (for example, #3) for which reset is desired as described above. When the wireless power transmitter receives DSR / ack from the wireless power receiver, it can simultaneously perform reset and local buffer clear of incoming and / or outgoing data.

[0643] Explaining the example of FIG. 31 differently is as follows. When the wireless power transmitter executes a reset indication for a specific application stream to the wireless power receiver, at the moment when the wireless power transmitter receives a DSR / ack from the other party, the wireless power transmitter can perform the reset function.

[0644] When the wireless power receiver receives the reset indication from the wireless power transmitter, it can perform the reset function. The wireless power receiver that has completed the reset function can send a DSR / ack to the wireless power transmitter upon completion.

[0645] Based on the response of the wireless power receiver, the wireless power receiver and / or the wireless power transmitter will discard the data stored in the local buffer of the communication so far and / or the incoming & outgoing data.

[0646] However, in this case, the wireless power transmitter and / or the wireless power receiver can save the data of the application layer. However, the wireless power transmitter and / or the wireless power receiver can discard all the data stored in the transport layer and the local buffer of the communication so far and / or the incoming & outgoing data.

[0647] Even when the wireless power transmitter and / or the wireless power receiver have all completed the reset, the corresponding application stream can be maintained in an open state. Then, the wireless power transmitter can continue to perform data communication for the corresponding application stream for which the reset has been executed.

[0648] That is, if the initiator is the wireless power transmitter and the responder is the wireless power receiver before the reset, the wireless power transmitter can still be the initiator and the wireless power receiver can be the responder after the reset. Conversely, if the initiator is the wireless power receiver and the responder is the wireless power transmitter before the reset, the wireless power receiver can still be the initiator and the wireless power transmitter can be the responder after the reset.

[0649] The following describes an example in which a wireless power receiver transmits reset information to a wireless power transmitter.

[0650] FIG. 32 schematically shows an example in which a wireless power receiver transmits reset information.

[0651] According to FIG. 32, while the wireless power receiver is transmitting a data stream to the wireless power transmitter, the wireless power receiver can transmit reset information (for example, an ADC packet instructing to reset stream #3, that is, ADC / reset / steram#3) to the wireless power transmitter. Here, although the example of FIG. 32 illustrates a case where the wireless power receiver transmits a data stream to the wireless power transmitter, the example of FIG. 32 can also be applied to the case where the wireless power transmitter transmits a data stream to the wireless power receiver.

[0652] When the wireless power transmitter receives a reset packet corresponding to a stream (for example, #3) for which reset is desired, the wireless power transmitter can simultaneously execute reset of incoming and / or outgoing data and clear the local buffer. Then, the wireless power transmitter can transmit an ACK to the wireless power receiver.

[0653] After receiving the ACK from the wireless power transmitter, the wireless power receiver can execute reset of incoming and / or outgoing data and clear the local buffer, and execute the reset.

[0654] Thereafter, the wireless power transmitter and / or the wireless power receiver can re-execute data communication from the beginning while maintaining the open state of the data stream after the reset is completed.

[0655] Explaining the example of FIG. 32 differently, it is as follows. When the wireless power receiver executes an indication of intention to reset for a specific application stream to the wireless power transmitter and receives an ACK from the wireless power receiver, the wireless power receiver can perform the reset function.

[0656] When the wireless power receiver receives the reset indication from the wireless power transmitter, it can perform the reset function. The wireless power transmitter that has completed the reset function can send an ACK to the wireless power receiver upon completion.

[0657] Based on the response of the wireless power transmitter, the wireless power transmitter and / or the wireless power receiver will discard the data stored in the local buffer of the communication so far and / or the incoming & outgoing data.

[0658] However, in this case, the wireless power receiver and / or the wireless power transmitter can save the data at the application layer. However, the wireless power receiver and / or the wireless power transmitter can discard all the data stored in the transport layer and the local buffer of the communication so far and / or the incoming & outgoing data.

[0659] Even when all the wireless power receivers and / or the wireless power transmitters have completed the reset, the corresponding application stream can be maintained in an open state. Then, the wireless power receiver can continue to perform data communication for the corresponding application stream for which the reset has been executed.

[0660] That is, if the initiator is the wireless power receiver and the responder is the wireless power transmitter before the reset, the wireless power receiver can still be the initiator and the wireless power transmitter can be the responder after the reset. Conversely, if the initiator is the wireless power transmitter and the responder is the wireless power receiver before the reset, the wireless power transmitter can still be the initiator and the wireless power receiver can be the responder after the reset.

[0661] Hereinafter, a method of transmitting reset information will be described in other forms with reference to the drawings.

[0662] FIG. 33 shows an example of a method of transmitting reset information in other forms.

[0663] According to FIG. 33, until the data stream is closed, regardless of which entity sends the information regarding the reset (i.e., regardless of whether the sender is a wireless power receiver, a wireless power transmitter, an initiator, or a responder), the status of the initiator and the responder can remain unchanged and the data stream can proceed.

[0664] During data communication executed by the wireless power transmitter and / or the wireless power receiver while the data stream is open, if a problem occurs and the wireless power transmitter can send ADC / reset, the wireless power receiver can receive the reset information and perform the reset function. After completion of the reset function, the wireless power receiver can send DSR / ack to the wireless power transmitter. When the wireless power transmitter receives DSR / ack as a response from the wireless power receiver, the wireless power transmitter can perform the reset function. This is because if the wireless power transmitter performs a reset before receiving a response from the wireless power receiver, it will be difficult for the wireless power transmitter to analyze the response received from the wireless power receiver.

[0665] When both of the two devices, the wireless power receiver and / or the wireless power transmitter, perform a reset, the reset sequence stream remains maintained. Then, with the stream open, the wireless power transmitter and / or the wireless power receiver can perform data communication again.

[0666] On the other hand, as described above, even though the wireless power transmitter or the wireless power receiver has sent reset information to the other party, there may be a case where the wireless power transmitter or the wireless power receiver cannot receive a response from the other party. In such a case, a problem may occur where data communication should continue to proceed despite a problem occurring in the wireless power system.

[0667] Therefore, as described above, this specification describes a method for forcibly terminating (in other words, aborting) a data stream.

[0668] Here, the condition for entering the forced termination is separate from the condition for the reset. That is, the wireless power transmitter and / or the wireless power receiver can immediately execute a forced termination without resetting the data stream when the problem situation occurs.

[0669] On the other hand, the wireless power transmitter and / or the wireless power receiver attempts to reset as described above. If the wireless power transmitter and / or the wireless power receiver cannot receive a response to the reset information from the other party (or if it cannot receive a response during a specific period; or if it cannot receive a response to the reset information despite repeatedly transmitting the reset information a specific number of times), it can also proceed with the forced termination protocol.

[0670] Hereinafter, the illustration for the forced termination will be described more specifically.

[0671] 2. Forced Termination of Data Stream

[0672] The following drawings are created to explain a specific example of this specification. Since the names of the specific devices described in the drawings and the names of the specific signals / messages / fields are presented exemplarily, the technical features of this specification are not limited to the specific names used in the following drawings.

[0673] FIG. 34 is a flowchart of a method for a wireless power transmitter to transmit wireless power according to another embodiment of this specification.

[0674] According to FIG. 34, the wireless power transmitter can enter (enter) a power transmission phase related to transmitting wireless power (S3410).

[0675] As described above, a wireless power transmitter that has entered the power transmission phase can transmit power to a wireless power receiver. Then, the wireless power receiver can perform power control by periodically transmitting CE packets to the wireless power transmitter. Also, the wireless power transmitter can perform FOD during power transmission by receiving RP packets from the wireless power receiver. Since specific descriptions of these have been given above, repeated descriptions will be omitted.

[0676] In addition, the wireless power transmitter and / or the wireless power receiver can transmit a data stream to the other party from the position of a data stream initiator.

[0677] That is, the wireless power transmitter can transmit a data stream to the wireless power receiver, or the wireless power transmitter can receive a data stream from the wireless power receiver (S3420). At this time, the data stream can include an initial ADC packet, at least one ADT packet, and a final ADC packet. And the initial ADC packet can correspond to a packet related to the opening of the data stream, and the final ADC packet can correspond to a packet related to the closing of the data stream.

[0678] On the other hand, while the data stream is being transmitted as described above, the wireless power transmitter and / or the wireless power receiver can transmit abort information to the other party (S3430). That is, the wireless power transmitter can transmit abort information to the wireless power receiver regardless of whether it is a data stream initiator or a responder. In addition, the wireless power receiver can transmit abort information to the wireless power transmitter regardless of whether it is a data stream initiator or a responder.

[0679] Thereafter, the wireless power transmitter and / or the wireless power receiver can perform an abort (i.e., forced termination) of the data stream (S3440).

[0680] Here, the wireless power transmitter can abort the first data stream based on transmitting abort information. In contrast, the wireless power transmitter can abort the first data stream based on receiving a response to the abort information.

[0681] After abort, the wireless power transmitter can close the first data stream.

[0682] Here, the wireless power transmitter can discard the data stored below the transport layer based on executing an abort. This is described through the drawings as follows.

[0683] Figure 35 schematically shows the concept of abort of a data stream.

[0684] According to Figure 35, the wireless power transmitter and / or the wireless power receiver (or, the data stream initiator and / or the data stream responder) can discard all the data in the transport layer / buffer including the incoming / outgoing data when a data communication in - transit abort is executed. Here, also in this case, the application layer can be saved as it is.

[0685] As an example, in the case of an Abort during data communication of a specific application stream, either the receiver or the transmitter can send abort information regardless of the initiator / responder of the data exchange.

[0686] (1) Example of the structure of abort information

[0687] On the one hand, the abort information is in the form of a packet for a separate data communication (TPL), and the abort information is a deformed form of the existing packet as described above. That is, the method by which the wireless power receiver / wireless power transmitter expresses the intention of forced termination (Abort) to the counterpart device is either in the form where a separate TPL packet is provided or in the form where bits are added to the existing packet (DSR / ADC / other packets).

[0688] Here, when the abort information has, for example, the form of a packet for a separate data communication, it is as described in the following drawings.

[0689] Figure 36 schematically shows an example illustration of the abort information.

[0690] According to Figure 36, as an example of the abort information, a separate packet used in data communication can be defined.

[0691] The information at this time can include fields (information) for the type of TPL. By way of example, the following values can be provided.

[0692] 0x00 - TPL / Pause

[0693] 0x01 - TPL / Busy

[0694] 0x02 - TPL / Abort

[0695] 0x03~0xFF - TPL / Reserved

[0696] On the other hand, when the abort information has, for example, the form of an existing packet for data communication, it is as described in the following drawings. In the following example, an example of using the DSR packet for abort information is described and illustrated.

[0697] Figure 37 schematically shows another example illustration of the abort information.

[0698] According to FIG. 37, as an example for abort information, a DSR packet used in data communication can be used. For example, a separate field named TPL / type can be defined in the DSR packet.

[0699] The information at this time can include a field (information) for the type of TPL. By way of example, the following values can be provided.

[0700] 0x00 - TPL / Pause

[0701] 0x01 - TPL / Busy

[0702] 0x02 - TPL / Abort

[0703] 0x03~0xFF - TPL /

[0704] (2) Flowchart of an example for sending abort information

[0705] To explain the above example more specifically through a specific flowchart, it is as follows.

[0706] During data communication between wireless charging devices, there can be a situation where the currently ongoing data communication cannot proceed further. By way of example, when charging becomes impossible due to a specific abnormal state, or when charging is interrupted for a while, or when charging does not operate properly, or when charging is unstable, or when an abnormality occurs during data communication, etc.

[0707] In the above cases, the wireless power transmitter and / or the wireless power receiver can terminate the data communication by indicating to the counterpart device a forced termination (Abort).

[0708] Here, when the data communication ends, the wireless power transmitter and / or the wireless power receiver can discard all the data stored in the local buffer that they have exchanged so far and / or the incoming & outgoing data. However, even in this case, the wireless power transmitter and / or the wireless power receiver can save the data in the buffer of the application layer.

[0709] First, an example of the wireless power transmitter sending abort information to the wireless power receiver will be described.

[0710] Figures 38 and 39 are exemplary flowcharts of the wireless power transmitter sending abort information to the wireless power receiver.

[0711] According to Figures 38 and 39, at the moment when the wireless power transmitter indicates an emergency termination to the wireless power receiver or at the moment when it indicates an emergency termination and receives DSR / ack from the other party, the data communication can be forcibly terminated. In such a case, the wireless power transmitter and / or the wireless power receiver can discard all the data transmitted and received so far, the data stored in the local buffer, and / or the incoming & outgoing data.

[0712] However, the wireless power transmitter and / or the wireless power receiver can save the data of the application layer. And the wireless power transmitter and / or the wireless power receiver can discard all the data of the transport layer, the local buffer, and the incoming & outgoing data.

[0713] The method for the wireless power receiver and / or the wireless power transmitter to indicate an emergency termination to the other device can include adding bits to a separate Pause packet or an existing packet (DSR / ADC / other packets). The content regarding this is as described above.

[0714] Here, the differences between FIGS. 38 and 39 are as follows. In FIG. 38, at the moment when the wireless power transmitter indicates the intention of forced data termination to the other party, the data stream can be forcibly terminated. In FIG. 39, when the wireless power transmitter indicates the intention of forced data termination to the other party and the wireless power transmitter receives DSR / ack from the wireless power receiver, the data stream can be forcibly terminated.

[0715] Hereinafter, an example in which the wireless power receiver transmits abort information to the wireless power transmitter will be described.

[0716] FIGS. 40 and 41 are flowcharts illustrating an example in which the wireless power transmitter transmits abort information to the wireless power receiver.

[0717] According to FIGS. 40 and 41, at the moment when the wireless power receiver indicates the intention of forced termination to the wireless power transmitter or at the moment when the wireless power receiver indicates the intention of forced termination and receives ACK from the other party, the data communication can be forcibly terminated. The wireless power transmitter and / or the wireless power receiver can discard all the data transmitted and received so far, the data stored in the local buffer, and / or the incoming & outgoing data. However, even in this case, the wireless power transmitter and / or the wireless power receiver can save the data at the application layer. On the other hand, the wireless power transmitter and / or the wireless power receiver can discard all the data at the transport layer, the data in the local buffer, and the incoming & outgoing data.

[0718] Here, as a method for the wireless power receiver and / or the wireless power transmitter to indicate the intention of forced termination to the other device, there can be a method of adding bits to a separate abort packet or an existing packet (DSR / ADC / other packets). Specific examples thereof are as described above.

[0719] Here, the differences between FIGS. 40 and 41 are as follows. In FIG. 40, at the moment when the wireless power receiver indicates the intention of forced data termination to the other party, the data stream can be forced to terminate. In FIG. 41, when the wireless power receiver indicates the intention of forced data termination to the other party and the wireless power receiver receives an ACK from the wireless power transmitter, the data stream can be forced to terminate.

[0720] FIG. 42 shows an example of a method for transmitting abort information in another form.

[0721] According to FIG. 42, when an Abort occurs during data communication of a specific application stream, the abort information can be sent to the other party regardless of whether the initiator and / or responder for data exchange is (and whether the wireless power transmitter and / or wireless power receiver is).

[0722] In the example shown in FIG. 42, the wireless power transmitter can send abort information to the wireless power receiver from the position of the initiator. And based on the transmission of the abort information, the data stream between the wireless power transmitter and the wireless power receiver can be forced to terminate.

[0723] 3. Combination of Reset and Forced Termination of Data Stream

[0724] As described above, the embodiments of this specification have been described once from the perspective of reset of the data stream and once from the perspective of forced termination of the data stream.

[0725] Here, as described above, the above embodiments can operate separately as described above, and at the same time, the above embodiments can also operate in combination.

[0726] Moreover, the above examples can also be applied when the wireless power transmitter and / or wireless power receiver supports multi-streams.

[0727] An example in which the above examples are combined will be described with reference to the drawings as follows.

[0728] FIG. 43 is a flowchart of a method by which a wireless power transmitter transmits wireless power according to another embodiment of the present specification.

[0729] According to FIG. 43, a wireless power transmitter and / or a wireless power receiver can open a first data stream (S4310). That is, the wireless power transmitter can transmit an initial ADC packet for the first data stream (i.e., a channel of the first data stream is marked) to the wireless power receiver. Or, the wireless power receiver can transmit an initial ADC packet for the first data stream (i.e., a channel of the first data stream is marked) to the wireless power transmitter.

[0730] On the other hand, as described above, the present specification can support the opening of multiple streams. That is, in the present specification, while the wireless power transmitter and the wireless power receiver exchange the first data stream, they can also exchange the second data stream.

[0731] In other words, a wireless power transmitter and / or a wireless power receiver can open a second data stream (S4320). That is, the wireless power transmitter can transmit an initial ADC packet for the second data stream (i.e., a channel of the second data stream is marked) to the wireless power receiver. Or, the wireless power receiver can transmit an initial ADC packet for the second data stream (i.e., a channel of the second data stream is marked) to the wireless power transmitter.

[0732] i) In summary, according to the present specification, a multi-stream exchange between a wireless power transmitter and a wireless power receiver can be provided.

[0733] Also, for example, the wireless power transmitter can transmit first reset information for a first data stream to the wireless power receiver (S4330). The first reset information at this time can have the form of a kind of ADC packet as described above, or can have the form of a separate data packet. And the first reset information can also be marked that this information is for the first data stream.

[0734] The wireless power transmitter can receive a response to the first reset information from the wireless power receiver (S4340). Here, when the wireless power transmitter receives a response from the wireless power receiver, the response at this time is, for example, DSR / ack. If the wireless power receiver receives a response from the wireless power transmitter, the response at this time is ACK.

[0735] Thereafter, the wireless power transmitter and / or the wireless power receiver can initialize the first data stream (S4350).

[0736] However, since the reset on the wireless corresponds to the reset for the first data stream, the wireless power transmitter and / or the wireless power receiver can transmit or receive a second data stream. That is, the second data stream is not initialized.

[0737] ii) In summary, according to this specification, a reset for a specific data stream can be provided.

[0738] However, even if a reset for a specific data stream is provided, this specification does not exclude from the scope of rights the execution of a reset for all open data streams. Thereby, an example of executing a reset for all data streams and an example of executing an abort (for a specific stream or all streams) can also be combined with each other.

[0739] On the one hand, the wireless power transmitter can transmit second reset information for a second data stream to the wireless power receiver (S4360).

[0740] Here, the wireless power transmitter cannot receive a response for the second data stream from the wireless power receiver.

[0741] If a specific condition is satisfied, the wireless power transmitter can transmit abort information for the second data stream to the wireless power receiver (S4370).

[0742] The conditions at this time can include the case where the wireless power transmitter cannot receive a response to the second reset information within a specific time (exchanged in advance between the wireless power transmitter and the wireless power receiver or can be defined in advance) after transmitting the second reset information.

[0743] Or, the conditions at this time can include the case where the wireless power transmitter cannot receive a response to the second reset information until the second reset information is repeatedly transmitted a preset number of times (exchanged in advance between the wireless power transmitter and the wireless power receiver or can be defined in advance).

[0744] Thereafter, the wireless power transmitter and the wireless power receiver can abort the second data stream (S4380).

[0745] iii) In summary, according to this specification, an abort for a specific data stream can be provided.

[0746] However, even if an abort for a specific data stream is provided, this specification does not exclude from the scope of rights the execution of an abort for all open data streams. Thereby, an example of executing an abort for all data streams and an example of executing a reset (for a specific stream or all streams) can also be combined with each other.

[0747] iv) If sorted out, according to this specification, the transmission of reset information and the transmission of abort information can be combined.

[0748] Of course, as described above, the example in which reset information is transmitted and the example in which abort information is transmitted can also operate separately.

[0749] Hereinafter, the embodiments of this specification will be described again from various subjective perspectives.

[0750] The following drawings are created to illustrate a specific example of this specification. Since the names of specific devices and the names of specific signals / messages / fields described in the drawings are presented exemplarily, the technical features of this specification are not limited to the specific names used in the following drawings.

[0751] FIG. 44 is a flowchart of a method for transmitting wireless power from the perspective of a wireless power transmitter according to an embodiment of this specification.

[0752] According to FIG. 44, the wireless power transmitter can enter (enter) a power transmission phase related to transmitting the wireless power (S4410).

[0753] The wireless power transmitter can transmit a first data stream to the wireless power receiver during the power transmission phase (S4420).

[0754] Here, the wireless power transmitter transmits reset information notifying a reset of the first data stream to the wireless power receiver, the wireless power transmitter receives a response to the reset information from the wireless power receiver, and the wireless power transmitter can execute a reset of the first data stream based on receiving the response.

[0755] Here, before and after the reset, the opening of the first data stream can be maintained. And after the reset, the wireless power transmitter can transmit the first data stream to the wireless power receiver from the beginning. And the first data stream includes an initial ADC (auxiliary data control) packet related to the opening of the first data stream, at least one ADT (auxiliary data transport) packet, or a final ADC packet related to the closing of the first data stream. After the reset, the wireless power transmitter can transmit the at least one ADT packet to the wireless power receiver without transmitting the initial ADC packet.

[0756] Here, the wireless power transmitter can transmit a second data stream to the wireless power receiver while transmitting the first data stream. And based on the wireless power transmitter receiving the response to the reset information from the wireless power receiver, the wireless power transmitter can execute the reset of the first data stream without executing the reset of the second data stream.

[0757] Here, the reset information can include information for identifying the first data stream.

[0758] Here, the wireless power transmitter can discard the data stored below the transport layer based on executing the reset.

[0759] Here, the wireless power transmitter can transmit abort information to the wireless power receiver to notify an abort of the first data stream based on the inability to receive the response. Then, the wireless power transmitter can execute the abort of the first data stream based on transmitting the abort information. Alternatively, after the abort, the wireless power transmitter can close the first data stream. And the wireless power transmitter can execute the abort of the first data stream based on receiving a response to the abort information. And the wireless power transmitter can discard data stored below the transport layer based on executing the abort.

[0760] Although not shown separately, a wireless power transmitter can be provided. The wireless power transmitter can include a converter related to transmitting wireless power to a wireless power receiver and a communication / controller related to controlling the transmission of the wireless power. The wireless power transmitter can enter a power transmission phase related to transmitting the wireless power and transmit a first data stream to the wireless power receiver during the power transmission phase. The wireless power transmitter transmits reset information to the wireless power receiver to notify a reset of the first data stream, the wireless power transmitter receives a response to the reset information from the wireless power receiver, and the wireless power transmitter can execute the reset of the first data stream based on receiving the response.

[0761] FIG. 45 is a flowchart of a method of receiving wireless power from the perspective of a wireless power receiver according to an embodiment of the present specification.

[0762] According to FIG. 45, the wireless power receiver can enter a power transmission phase related to receiving the wireless power (S4510).

[0763] The wireless power receiver can receive a first data stream from the wireless power transmitter during the power transfer phase (S4520).

[0764] Here, the wireless power receiver receives reset information from the wireless power transmitter that indicates a reset of the first data stream, the wireless power receiver executes the reset of the first data stream based on receiving the reset information, and the wireless power receiver can transmit a response to the reset information to the wireless power transmitter based on executing the reset.

[0765] Although not shown separately, a wireless power receiver can be provided. The wireless power receiver can include a power pickup related to receiving wireless power from a wireless power transmitter and a communication / controller related to controlling the reception of the wireless power. The wireless power receiver enters a power transfer phase related to receiving the wireless power and can receive a first data stream from the wireless power transmitter during the power transfer phase. The wireless power receiver receives reset information from the wireless power transmitter that indicates a reset of the first data stream, the wireless power receiver executes the reset of the first data stream based on receiving the reset information, and the wireless power receiver can transmit a response to the reset information to the wireless power transmitter based on executing the reset.

[0766] Hereinafter, the effects of this specification will be described.

[0767] To explain the effects, the above-described problem will be described again.

[0768] Basically, according to the present specification, a configuration is provided in which all of the transport layer buffers and incoming and / or outgoing data are discarded via reset or abort, so that an effect can be provided that can solve the problem even when the memory for data storage is stuck and no further recovery is possible. Not only that, in the case of reset, a configuration is provided to maintain the corresponding application stream in an open state, so that data communication can be immediately executed. That is, the data transmission time can be optimized.

[0769] On the other hand, when a problem occurs in storing / communicating data for a specific stream during the progress of various application data streams (or when a problem occurs in the transport layer), other streams (stream 1 and stream 3) excluding the corresponding stream in which the problem has occurred (assuming, for example, that a problem has occurred in stream 2) may be free of problems.

[0770] Even in this case, if all streams are reset or force-terminated, reset or force-termination can also be executed on other streams that are not problematic (for example, stream 1 and stream 3). In this case, the radio power transmitter and / or radio power receiver have to execute data communication again from the beginning up to the streams that are not problematic. This can be regarded as an inefficient method.

[0771] According to the present specification, when a problem occurs with a specific stream, by resetting or force-terminating only the specific stream, the inefficiency of unnecessarily resetting or force-terminating streams that are not problematic can be prevented. Thereby, data streams that are not problematic can continue to be transmitted, so that the data transmission time can be shortened.

[0772] Additionally, if the wireless power transmitter and / or the wireless power receiver perform a reset immediately after transmitting reset information to the other party, a communication error may occur where the response cannot be received from the other party, or even if the response is received, it cannot be analyzed. In this specification, in order to prevent the above problem, in the case of resetting the data stream, instead of performing the reset immediately after the wireless power transmitter and / or the wireless power receiver transmit the reset information to the other party, a configuration is provided in which the reset is performed after receiving a response from the other party. Thereby, an effect of preventing a communication error can be achieved.

[0773] The effects obtained through a specific example of this specification are not limited to the effects listed above. For example, there may be various technical effects that a person having ordinary skill in the related art can understand or derive from this specification. Accordingly, the specific effects of this specification are not limited to those explicitly described in this specification, and can include various effects that can be understood or derived from the technical features of this specification.

[0774] The claims described in this specification may be combined in various ways. For example, the technical features of the method claims in this specification may be combined and implemented in an apparatus, or the technical features of the apparatus claims in this specification may be combined and implemented in a method. Also, the technical features of the method claims in this specification and the technical features of the apparatus claims may be combined and implemented in an apparatus, or the technical features of the method claims in this specification and the technical features of the apparatus claims may be combined and implemented in a method.

Claims

1. In a method for transmitting wireless power in a wireless power transmission system, the method comprises: being executed by a wireless power transmitter, transmitting an initial ADC (auxiliary data control) packet for opening a first data stream to a wireless power receiver; transmitting at least one ADT (auxiliary data transport) packet for the first data stream to the wireless power receiver; transmitting a reset ADC packet to the wireless power receiver to notify a reset of the first data stream, the reset ADC packet including information for identifying the first data stream; receiving a response to the reset ADC packet from the wireless power receiver, wherein the wireless power transmitter executes the reset of the first data stream based on receiving the response.

2. The method according to claim 1, wherein the first data stream is maintained open before and after the reset.

3. The method according to claim 2, wherein after the reset, the wireless power transmitter transmits the first data stream to the wireless power receiver from the beginning.

4. The first data stream includes the initial ADC packet, the at least one ADT packet, or a final ADC packet for closing the first data stream. The method according to claim 2, wherein after the reset, the wireless power transmitter transmits the at least one ADT packet to the wireless power receiver without transmitting the initial ADC packet.

5. The method according to claim 1, wherein the wireless power transmitter transmits a second data stream to the wireless power receiver while transmitting the first data stream.

6. Based on the wireless power transmitter receiving the response to the reset ADC packet from the wireless power receiver, the wireless power transmitter executes the reset of the first data stream without executing a reset of the second data stream.

7. The method according to claim 1, wherein the wireless power transmitter discards data stored under the transport layer based on executing the reset.

8. The method according to claim 1, wherein the wireless power transmitter transmits abort information notifying of the abort of the first data stream to the wireless power receiver based on not receiving the response.

9. The method according to claim 8, wherein the wireless power transmitter executes the abort of the first data stream based on transmitting the abort information.

10. The method according to claim 9, wherein after the abort, the wireless power transmitter closes the first data stream.

11. The method according to claim 8, wherein the wireless power transmitter executes the abort of the first data stream based on receiving a response to the abort information.

12. The method according to claim 8, wherein the wireless power transmitter discards data stored under the transport layer based on executing the abort.

13. In a wireless power transmitter, a converter related to transmitting wireless power to a wireless power receiver, a communication / controller related to controlling the transmission of the wireless power, and the wireless power transmitter transmits an initial ADC (auxiliary data control) packet for opening a first data stream to the wireless power receiver, transmits at least one ADT (auxiliary data transport) packet for the first data stream to the wireless power receiver, transmits a reset ADC packet notifying of the reset of the first data stream to the wireless power receiver, the reset ADC packet including information identifying the first data stream, receives a response to the reset ADC packet from the wireless power receiver, The wireless power transmitter executes the reset of the first data stream based on receiving the response.

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