Method and device for providing compatibility with MPP in wireless power transmitting system

Abstract

To provide a method for receiving wireless power and a device for utilizing the same.SOLUTION: A method for receiving wireless power performed by a wireless power receiving device supporting a magnetic power profile (MPP) in a wireless power transmitting system includes: transmitting a first identification (ID) packet to a wireless power transmitting device at a first operating frequency, where the first ID packet includes information indicating whether a first extended ID (XID) packet is present; transmitting the first XID packet to the wireless power transmitting device at the first operating frequency, where the first XID packet includes information indicating that the first XID packet is a packet related to the MPP; and sensing whether the wireless power transmitting device is operating at the first operating frequency or a second operating frequency after transmitting the first XID packet.SELECTED DRAWING: Figure 25

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 superior mobility, convenience, and safety compared to the existing wired charging environment that uses a 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 (registered trademark) 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, a no point of 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 using 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, in wireless charging, a method for identifying the profile between a BPP / EPP wireless power transmitting device / wireless power receiving device and an MPP wireless power transmitting device / wireless power receiving device, and a device using the same are to be provided.

Summary of the Invention

Problems to be Solved by the Invention

[0006] According to an embodiment of the present specification, a method and a device are provided for transmitting a first XID packet to the wireless power transmitting device at a first operating frequency, the first XID packet including information indicating that the first XID packet is a packet related to MPP, and sensing whether the wireless power transmitting device is operating at the first operating frequency or the second operating frequency after transmitting the first XID packet.

Effects of the Invention

[0007] According to this specification, compatibility issues between the PTx / PRx of MPP / BPP / EPP can be resolved. In addition, it is possible to achieve the effect of providing a stable protocol progression through clear trigger confirmation of MPP / BPP / EPP.

[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 Drawings

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DETAILED DESCRIPTION OF THE INVENTION

[0010] In the present specification, "A or B" can mean "only A", "only B", or "both A and B". As another expression, in the present specification, "A or B" can be interpreted as "A and / or B". For example, in the present specification, "A, B or C" can mean "only A", "only B", "only C", or "any combination of A, B and C".

[0011] As used herein, a slash ( / ) or a comma can mean “and / or”. For example, “A / B” can mean “A and / or B”. Thus, “A / B” can mean “only A”, “only B”, or “both A and B”. For example, “A, B, C” can mean “A, B, or C”.

[0012] As used herein, “at least one of A and B” can mean “only A”, “only B”, or “both A and B”. Also, as used herein, expressions such as “at least one of A or B” and “at least one of A and / or B” can be interpreted in the same way as “at least one of A and B”.

[0013] Also, as used herein, “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”.

[0014] 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".

[0015] In this specification, the technical features individually described within one drawing can be implemented individually or simultaneously. The term "wireless power" used hereinafter is used to mean any form of energy related to an electric field, a magnetic field, an electromagnetic field, etc. transmitted from a wireless power transmitter to a wireless power receiver without the use of a physical electromagnetic conductor. Wireless power is also called 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, iPod (registered trademark), MP3 players, headsets, etc. Generally, the basic principles of wireless power transmission include, for example, all methods of transmitting power via magnetic coupling, methods of transmitting power via radio frequency (RF), methods of transmitting power via microwave, and methods of transmitting power via ultrasonic waves.

[0016] FIG. 1 is a block diagram of a wireless power system 10 according to an embodiment.

[0017] Referring to FIG. 1, the wireless power system 10 includes a wireless power transmitter 100 and a wireless power receiver 200.

[0018] The wireless power transmitter 100 receives power from an external power source (S) and generates a magnetic field. The wireless power receiver 200 wirelessly receives power by generating a current using the generated magnetic field.

[0019] 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 performed by either in-band communication that uses the magnetic field used 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 (registered trademark), BLE (Bluetooth low energy), and the like.

[0020] Here, the wireless power transmitter 100 can be provided in a fixed or mobile form. Examples of the fixed form include a form embedded in indoor ceilings, walls, or furniture such as tables, a form implanted in outdoor parking lots, bus stops, subway stations, etc., and a form installed in transportation means such as vehicles and trains. The wireless power transmitter 100 that is mobile can be implemented as a part of another device, such as a mobile device with a movable weight and size or a cover of a notebook computer.

[0021] In addition, the wireless power receiving device 200 must 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.

[0022] FIG. 2 is a block diagram of a wireless power system 10 according to another embodiment.

[0023] Referring to FIG. 2, in the wireless power system 10, the wireless power receiving device 200 may be 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 one-to-one. 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.

[0024] 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.

[0025] 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.

[0026] FIG. 3 shows an example of various electronic devices to which a wireless power transmission system is introduced.

[0027] In FIG. 3, the electronic devices are classified and shown according to the amount of power transmitted and received by 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, smartphones, PDAs, and tablet PCs.

[0028] For medium / small home appliances such as notebooks, robot vacuum cleaners, TVs, audio devices, vacuum cleaners, and monitors, a wireless charging method with medium power (about 50W or less or about 200W or less) can be applied. For kitchen 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.

[0029] The above-described (or shown in FIG. 1) electronic device / moving means can each include a wireless power receiver described later. Therefore, the above-described electronic device / moving means can be wirelessly charged by receiving power from a wireless power transmitter.

[0030] Hereinafter, 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.

[0031] Standards for wireless power transmission include WPC (Wireless Power Consortium), AFA (Air Fuel Alliance), and PMA (Power Matters Alliance).

[0032] The WPC standard defines a Baseline Power Profile (BPP) and an Extended Power Profile (EPP). The BPP relates to wireless power transmission and reception devices that support power transmission of 5W, and the EPP relates to wireless power transmission and reception devices that support power transmission in a range greater than 5W and less than 30W.

[0033] 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.

[0034] 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.

[0035] The PC0 standard relates to wireless power transmission and reception devices that provide 5W of guaranteed power. 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.

[0036] The PC1 standard relates to wireless power transmission and reception devices that provide 30W - 150W of guaranteed power. 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.

[0037] The PC2 standard relates to wireless power transmission and reception devices that provide 200W - 2kW of guaranteed power, and its applications include kitchen appliances.

[0038] 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 necessity. Here, compatibility between the same PCs means that power can be transmitted and received between the same PCs. For example, if a wireless power transmission device that is PCx can charge a wireless power reception device having 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 transmission device that is PCx can charge a wireless power reception device having PCy, it can be determined that compatibility between different PCs is maintained.

[0039] Support for compatibility between PCs is a quite important issue in terms of user experience and infrastructure construction. However, there are a number of technical problems as follows for maintaining compatibility between PCs.

[0040] In the case of compatibility between the same PCs, for example, a wireless power reception 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 transmission device of the same PC, there is a problem when stably receiving power from a wireless power transmission 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 transmission device with a minimum guaranteed power of 200W transmits power to a wireless power reception device with a maximum guaranteed power of 5W, there is a risk that the wireless power reception device will be damaged due to overvoltage. As a result, it is difficult for a PC to define an indicator / criterion representing / indicating compatibility.

[0041] 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.

[0042] 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 jointly execute the smart charging function.

[0043] Also, the smart wireless charging service can include those that receive automatic input of WiFi credentials (WiFi credentials, wifi credentials). For example, the wireless charger sends the WiFi credentials to the smartphone, and the smartphone automatically inputs the WiFi credentials received from the wireless charger by running an appropriate APP.

[0044] 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.

[0045] 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 the smartphone receives information about the smart wireless charging service from the wireless charger, the smartphone enters a state of asking the user for ID (identity) confirmation.

[0046] 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 manner with or without 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 of selecting 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 in the vehicle by driving the application / display software in the vehicle. The user can enjoy the desired music and check the regular map position. The application / display software in the vehicle can include the performance of providing a synchronization approach for passengers.

[0047] As another example, the user can experience smart wireless charging at home. When the user enters the room and places the smartphone on the wireless charger, 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 may or may 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.

[0048] Hereinafter, a 'profile' is newly defined as an indicator / criterion representing / indicating compatibility. That is, compatibility is maintained between wireless power transmission and reception devices having the same 'profile', and it can be interpreted that power transmission and reception are not possible between wireless power transmission and reception devices having different 'profiles'. The profile can be defined by compatibility and / or applications regardless of (or independently of) the power class.

[0049] The profile can be broadly classified into three categories: i) mobile and computer, ii) power tools, and iii) kitchen.

[0050] Alternatively, the profiles can be broadly classified into four categories: i) mobile, ii) power tools, iii) kitchen, and iv) wearable.

[0051] 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.

[0052] In the case of the 'power tools' profile, the PC is PC1, the communication protocol / method is IB, the operating frequency can be defined as 87 - 145 kHz, and examples of applications can include power tools, etc.

[0053] In the case of the 'kitchen' profile, the PC is PC2, the communication protocol / method is NFC - based, the operating frequency can be defined as less than 100 kHz, and examples of applications can include kitchen / home appliances, etc.

[0054] 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 with each other by exchanging WPC NDEF (NFC Data Exchange Profile Format).

[0055] Figure 4 is a block diagram of a wireless power system according to an embodiment.

[0056] 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.

[0057] 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 transfer with the wireless power receiver 200 to transfer 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 multiple wireless power transmitters, and user interface control.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] Energy transmission between the primary resonance antenna and the secondary resonance antenna can be carried out 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 there are other resonance antennas 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 with the case where the magnetic field generated by the primary resonance antenna is radiated into free space, the magnetic field is focused toward the secondary resonance antenna with high efficiency. Therefore, energy can be transmitted 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.

[0062] 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 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 (registered trademark), and NFC.

[0063] 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.

[0064] 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 execute 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 (binary phase shift keying, BPSK), frequency shift (frequency shift keying, FSK), or amplitude shift (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.

[0065] The OB communication module can also execute 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.

[0066] The communication / control circuit 120 can control the overall operation of the wireless power transmission device 100. The communication / control circuit 120 can execute operations and processing of various information and control each component of the wireless power transmission device 100.

[0067] The communication / control circuit 120 can be implemented by a computer or a similar device using hardware, software, or a combination thereof. Hardware-wise, the communication / control circuit 120 can be provided in the form of an electronic circuit that processes electrical signals to perform control functions, and software-wise, it can be provided in the form of a program that drives the hardware communication / control circuit 120.

[0068] 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.

[0069] 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, and 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.

[0070] - Type A and type MP-A wireless power transmission devices 100

[0071] 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.

[0072] - The wireless power transmission devices 100 of Type B and Type MP B

[0073] 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.

[0074] 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 and supplies the power to the device.

[0075] 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).

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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 via the secondary coil, or by receiving magnetic waves containing information via 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 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.

[0080] The OB communication module can also execute out-of-band communication via a communication antenna. For example, the communication / control circuit 220 can be provided by a short-range communication module.

[0081] Examples of short-range communication modules include communication modules such as Wi-Fi, Bluetooth, Bluetooth LE, ZigBee, and NFC.

[0082] The communication / control circuit 220 can control the overall operation of the wireless power receiving device 200. The communication / control circuit 220 can execute calculations and processing of various information and control each component of the wireless power receiving device 200.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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).

[0087] 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).

[0088] 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.

[0089] The host stack 470 may include a BR / EDR PHY layer 12, a BR / EDR Baseband layer 14, and a Link Manager layer 16.

[0090] 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 through 79 RF channels.

[0091] 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.

[0092] The Link Manager layer 16 utilizes the LMP (Link Manager Protocol) to control the overall operations of the Bluetooth Connection (link setup, control, security).

[0093] The Link Manager layer 16 can perform the following functions.

[0094] - Perform ACL / SCO logical transport, logical link setup, and control.

[0095] -Detach: Disconnect the connection and notify the other device of the disconnection reason.

[0096] -Perform power control and role switch.

[0097] -Execute security (authentication, pairing, encryption) functions.

[0098] The host controller interface layer 18 provides an interface between the host module and the controller module, enabling the host to provide commands and data to the controller and the controller to provide events and data to the host.

[0099] 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.

[0100] The Logical Link Control and Adaptation Protocol (L2CAP) 21 can provide a single bidirectional channel for transmitting data to a specific protocol or profile.

[0101] The L2CAP 21 can multiplex various protocols, profiles, etc. provided above Bluetooth.

[0102] In the L2CAP of Bluetooth BR / EDR, dynamic channels are used, supporting protocol service multiplexer, retransmission, and streaming mode, and providing segmentation and reassembly, per-channel flow control, and error control.

[0103] The General Attribute Profile (GATT) 23 can operate as a protocol that describes 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 describe features associated with the services.

[0104] Therefore, the General Attribute Profile 23 and the Attribute Protocol (ATT) 22 can use features to describe the device state and services, how the features are related to each other, and how they are utilized.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] The host stack 490 can be a part of an OS operating on a processor module or can be implemented by instantiation of a package on the OS.

[0109] In some cases, the controller stack and the host stack can operate or execute on the same processing device within the processor module.

[0110] The controller stack 480 includes a physical layer (Physical Layer, PHY) 32, a link layer (Link Layer) 34, and a host controller interface 36.

[0111] The physical layer (PHY, wireless transceiver module) 32 is a layer that transmits and receives 2.4 GHz wireless signals and uses Gaussian Frequency Shift Keying (GFSK) modulation and a frequency hopping technique composed of 40 RF channels.

[0112] 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.

[0113] 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.

[0114] The host stack multiplexes various protocols, profiles, etc. provided above Bluetooth using L2CAP.

[0115] 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.

[0116] The L2CAP 41 may be operable to multiplex data between upper layer protocols, segment and reassemble packages, and manage multicast data transmission.

[0117] 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 needed.

[0118] On one hand, in BR / EDR (Basic Rate / Enhanced Data Rate), dynamic channels are basically used to support protocol service multiplexer, retransmission, streaming mode, etc.

[0119] SM (Security Manager) 42 is a protocol for authenticating devices and providing key distribution.

[0120] ATT (Attribute Protocol) 43 defines rules for accessing 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).

[0121] (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, and the Response message is a response message to the Request message, which means a message that can be used for transmission from the server device to the client device.

[0122] (2) Command message: 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.

[0123] (3) Notification message: 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 to the server device for the Notification message.

[0124] (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.

[0125] This specification uses the Attribute Protocol (ATT) 43 in the GATT profile to send a value for the data length when requesting long data, so that the client can clearly know the data length, and use the UUID to receive the characteristic value from the server.

[0126] 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.

[0127] Also, the General Access Profile 45 is mainly used in the device discovery, connection generation, and security procedure parts, defines a solution to provide information to the user, and defines the following types of attributes.

[0128] (1) Service: A combination of behaviors related to data that defines the basic operations of a device

[0129] (2) Include: Defines the relationship between services

[0130] (3) Characteristics: The data values used in a service

[0131] (4) Behavior: A format readable by a computer defined by UUID (Universal Unique Identifier, value type)

[0132] 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.

[0133] (1) Battery: Battery information exchange method

[0134] (2) Time: Time information exchange method

[0135] (3) FindMe: Provide an alarm service according to distance

[0136] (4) Proximity: Battery information exchange method

[0137] (5) Time: Time information exchange method

[0138] The general attribute profile (GATT) 44 can operate as a protocol that explains how the attribute protocol 43 is used 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.

[0139] Therefore, the general attribute profile 44 and the attribute protocol (ATT) 43 can use characteristics to describe the device state and services and to explain how the characteristics are related to each other and how they are used.

[0140] Hereinafter, the procedure of Bluetooth Low Energy (BLE) technology will be briefly described.

[0141] The BLE procedure can be divided into a device filtering procedure (Device Filtering Procedure), an advertising procedure (Advertising Procedure), a scanning procedure (Scanning Procedure), a discovering procedure (Discovering Procedure), a connecting procedure (Connecting Procedure), etc.

[0142] Device Filtering Procedure

[0143] 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.

[0144] 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.

[0145] An advertising device or a scanning device can execute the device filtering procedure to limit the devices that receive advertising packets, scan requests, or connection requests.

[0146] Here, an advertising device refers to a device that transmits an advertising event, that is, a device that executes advertising, and is also expressed as an advertiser (Advertiser).

[0147] A scanning device refers to a device that executes scanning and a device that sends a scan request.

[0148] 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.

[0149] 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.

[0150] 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.

[0151] Advertising Procedure

[0152] The advertising device executes an advertising procedure to perform an undirected broadcast to devices within the area.

[0153] Here, undirected advertising is advertising directed at all devices (not a broadcast directed at a specific device), and all devices can scan the advertising to request additional information or a connection request.

[0154] In contrast, directed advertising allows only the specified receiving device to scan the advertising to request additional information or a connection request.

[0155] The advertising procedure is used to establish a Bluetooth connection with a nearby initiating device.

[0156] Alternatively, the advertising procedure can be used to provide periodic broadcasts of user data to scanning devices listening on the advertising channel.

[0157] In the advertising procedure, all advertisements (or advertising events) are broadcast via an advertising physical channel.

[0158] 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.

[0159] The broadcast user data sent as part of an advertisement packet is dynamic data, while the scan response data is generally static data.

[0160] An advertising device can receive a connection request from a starting device on an advertising (broadcast) physical channel. If the advertising device uses an advertisement event that can be connected and the starting 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.

[0161] Scanning Procedure

[0162] 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.

[0163] 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, including the additional data requested by the scanning device via the advertising physical channel.

[0164] The scanning procedure can be used while connected to other BLE devices in a BLE piconet.

[0165] 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.

[0166] 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.

[0167] Discovering Procedure

[0168] 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.

[0169] The discovering procedure is executed asymmetrically. A Bluetooth device trying to discover other surrounding devices is called a discovering device and listens to discover devices advertising 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.

[0170] Both the discovering device and the discoverable device can already be connected to other Bluetooth devices in a piconet.

[0171] Connecting Procedure

[0172] 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.

[0173] 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.

[0174] Next, the operating states in BLE technology, namely, the Advertising State, Scanning State, Initiating State, and Connection State, will be briefly described.

[0175] Advertising State

[0176] 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 Circuit) from advertising events and the like.

[0177] 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.

[0178] Scanning State

[0179] The link layer enters the scanning state according to the instructions of the host (stack). In the scanning state, the link layer listens for the advertisement channel index.

[0180] There are two types of scanning states: passive scanning and active scanning. Each scanning type is determined by the host.

[0181] No separate time or advertisement channel index is defined for scanning.

[0182] During the scanning state, the link layer listens for the advertisement channel index during the scan window interval. The scan interval is defined as the interval between the start points of two consecutive scan windows.

[0183] If there is no scheduling conflict, the link layer must listen for all scan intervals of the scan window as instructed by the host. In each scan window, the link layer must scan other advertisement channel indexes. The link layer uses all available advertisement channel indexes.

[0184] When it is passive scanning, the link layer only receives packets and cannot send any packets.

[0185] When it is active scanning, the link layer listens because it depends on the advertisement PDU type that can request the advertisement PDU and additional information related to the advertisement device from the advertisement device.

[0186] Initiating State

[0187] The link layer enters the initiating state upon the instruction of the host (stack).

[0188] When the link layer is in the initiating state, the link layer listens for the advertising channel index.

[0189] During the initiating state, the link layer listens for the advertising channel index during the scan window interval.

[0190] (connection state)

[0191] The link layer enters the connection state when the device that makes a 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.

[0192] 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 (supervision timeout) value.

[0193] When both devices are connected, both devices play different roles.

[0194] The link layer that plays the master role is called the master, and the link layer that plays the slave role is called the slave. The master adjusts the timing of connection events, and the connection event refers to the time when synchronization occurs between the master and the slave.

[0195] Below, the packets defined in the Bluetooth interface will be briefly described. The BLE device uses the packets defined below.

[0196] Packet Format

[0197] The Link Layer has only one packet format that is used for both advertising channel packets and data channel packets.

[0198] Each packet is composed of four fields: a preamble, a connection address (access address), a PDU (Packet Data Unit), and a CRC.

[0199] 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.

[0200] Advertising Channel PDU

[0201] The Advertising Channel PDU (Packet Data Circuit) has a 16-bit header and a payload of various sizes.

[0202] The PDU type field of the advertising channel PDU included in the header indicates the PDU type as defined in Table 1 below.

[0203]

Table 1

[0204] Advertising PDU

[0205] The following advertising channel PDU types are called advertising PDUs and are used in specific events.

[0206] ADV_IND: Connectable undirected advertisement event

[0207] ADV_DIRECT_IND: Connectable directed advertisement event

[0208] ADV_NONCONN_IND: Non - connectable undirected advertisement event

[0209] ADV_SCAN_IND: Scan - able undirected advertisement event

[0210] The PDU is transmitted from the Link Layer in the advertising state and received by the Link Layer in the scanning state or Initiating State.

[0211] Scanning PDU

[0212] The following advertising channel PDU types are called Scanning PDUs and are used in the states described below.

[0213] SCAN_REQ: Transmitted by the Link Layer in the scanning state and received by the Link Layer in the advertising state.

[0214] SCAN_RSP: Transmitted by the Link Layer in the advertising state and received by the Link Layer in the scanning state.

[0215] Initiating PDUs

[0216] The following advertising channel PDU types are called Initiating PDUs.

[0217] CONNECT_REQ: Transmitted by the Link Layer in the initiating state and received by the Link Layer in the advertising state.

[0218] Data Channel PDU

[0219] The data channel PDU can have a 16-bit header, a payload of various sizes, and can include a message integrity check (MIC) field.

[0220] As described above, procedures, states, packet formats, etc. in BLE technology can be applied to implement the method proposed in this specification.

[0221] 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.

[0222] 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.

[0223] 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.

[0224] FIG. 6 is a block diagram showing a wireless power transmission system using BLE communication as an example.

[0225] 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.

[0226] 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.

[0227] On one aspect, 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.

[0228] On another aspect, 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.

[0229] FIG. 7 is a block diagram showing a wireless power transmission system that utilizes BLE communication according to another example.

[0230] 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.

[0231] Hereinafter, the coil or the coil part may be referred to as a coil assembly, a coil cell, or a cell, including the coil and at least one element adjacent to the coil.

[0232] When the 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.

[0233] FIG. 8 is a state transition diagram for explaining the wireless power transmission procedure.

[0234] WPC can define two communication protocols.

[0235] - 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.

[0236] - 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.

[0237] Referring to FIG. 8, the power transfer 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 roughly divided into a Ping Phase 810, a Configuration Phase 820, a Negotiation Phase 830, and a Power Transfer Phase.

[0238] - Ping Phase 810

[0239] 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.

[0240] Here, after obtaining the 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.

[0241] - Configuration phase 820

[0242] 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 transmission contract (power transfer contract).

[0243] 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.

[0244] Here, the wireless power receiver 200 can utilize functions such as improved FOD, data transmission stream, and authentication only when implementing the extended protocol.

[0245] - Negotiation phase 830

[0246] In negotiation phase 830, the wireless power transmitter 100 and the wireless power receiver 200 can set an extended power transfer contract including 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 FOD before switching to power transmission phase 840.

[0247] Here, negotiation phase 830 can correspond to a stage that does not exist in the baseline protocol.

[0248] - Power Transmission Phase 840

[0249] Power transmission phase 840 can be a stage where power is transmitted to the load of the wireless power receiver 200.

[0250] In the extended protocol, the wireless power transmitter 100 and the wireless power receiver 200 can perform system calibration (system calibration) when this stage starts. This stage may be interrupted occasionally to renegotiate the elements of the power transfer contract, but power transmission may continue during such renegotiation.

[0251] Hereinafter, the protocols for the aforementioned Ping Phase 810, Configuration Phase 820, Negotiation Phase 830, and Power Transfer Phase 840 will be described more specifically respectively.

[0252] 1. Ping Phase 810

[0253] When the pin phase 810 starts, the wireless power transmitter 100 still doesn't know whether the wireless power receiver 200 is within the operating volume. Also, the wireless power transmitter 100 can't recognize the wireless power receiver 200. The reason is that this system is generally deactivated due to insufficient power signals.

[0254] In such a situation, before the wireless power transmitter 100 starts the digital pin to request a response from the wireless power receiver 200, the wireless power transmitter 100 may go through the following steps.

[0255] Figure 9 schematically shows an example for the protocol of the pin phase 810.

[0256] According to Figure 9, the wireless power transmitter 100 can execute an analog pin (S910). That is, the wireless power transmitter 100 can send an analog pin to check whether there is an object within the operating volume. For example, the wireless power transmitter can sense whether there is an object within the operating volume based on the current change of the transmitting coil or the primary coil.

[0257] The wireless power transmitter 100 can apply NFC tag protection (S920). Here, the protection of the NFC tag can be executed according to the following procedure.

[0258] a) First, it can be confirmed whether one or more of the sensed individuals contain an NFC tag.

[0259] b) Subsequently, for an object containing an NFC tag, it can be confirmed whether it can withstand the power signal without being damaged.

[0260] c) If the wireless power transmission device 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 transmission device 100 can notify the user of the reason for not continuing the execution.

[0261] The wireless power transmission device 100 can perform foreign object sensing (S930). That is, the wireless power transmission device 100 can collect information useful for determining whether there is a foreign object other than the wireless power reception device 200. For this purpose, the wireless power transmission device 100 can use various methods such as the free-power FOD method.

[0262] On the other hand, in the three stages (S910, S920, S930) described above, the wireless power reception device does not have to operate.

[0263] When the wireless power transmission device 100 executes the above stage and determines that the wireless power reception device 200 is potentially present in the operating space, the wireless power transmission device 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 reception device 200.

[0264] Thereafter, the wireless power transmission device 100 can receive SIG or EPT from the wireless power reception device 200 (S950). Here, the SIG data packet can provide a measurement of the 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.

[0265] If the wireless power transmission device 100 cannot receive the above response from the wireless power reception device 200, the wireless power transmission device 100 can repeat the above stage while staying at the pin phase 810.

[0266] 2. Configuration phase 820

[0267] The configuration phase 820 is part of the following protocol.

[0268] - The wireless power receiving device 200 can cause the wireless power transmitting device 100 to identify itself.

[0269] - The wireless power receiving device 200 and the wireless power transmitting device 100 can establish a baseline power transfer contract.

[0270] - The wireless power receiving device 200 and the wireless power transmitting device 100 can determine a protocol variation for power transmission.

[0271] 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.

[0272] Hereinafter, the protocol in the configuration phase 820 will be described more specifically.

[0273] FIG. 10 schematically shows an example of the protocol for the configuration phase 820.

[0274] 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.

[0275] The wireless power transmission device 100 can selectively receive PCH (power control hold-off) data packets from the wireless power reception device 200 (S1030), and the wireless power transmission device 100 can receive CFG data packets from the wireless power reception device 200 (S1040). That is, the wireless power reception device 200 can use the PCH and / or CFG data packets to provide data for use in the power transmission contract.

[0276] Finally, the wireless power transmission device 100 can preferably check the extended protocol (S1050).

[0277] Summarizing and organizing each of the above-described data packets, it is as follows.

[0278] - 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. Also, the ID may include information for identifying the presence or absence of the XID data packet in the setting phase.

[0279] - XID: The XID data packet may include additional identification data.

[0280] - 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.

[0281] - CFG: The CFG data packet can provide basic configuration data.

[0282] For example, the CFG data packet can provide all parameters that recommend 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. Also, the CFG data packet can provide additional functions of the wireless power reception device 200.

[0283] FIG. 11 is a drawing showing a message field of a configuration packet (CFG) of a wireless power receiving device according to an embodiment.

[0284] According to FIG. 11, the 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.

[0285] 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.

[0286] 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.

[0287] The provision of the foregoing ID and / or XID is for identification. And the provision of the PCH and / or CFG is for building a power transmission contract.

[0288] 3. Negotiation Phase 830

[0289] The negotiation phase 830 is part of an extended protocol in which the wireless power transmitting device 100 and the wireless power receiving device 200 can change a power transmission contract. There are two types at this stage.

[0290] - Negotiation Phase 830: The negotiation phase 830 directly follows the configuration phase 820 and serves to generate an initial extended power transmission contract. At the same time, the negotiation phase 830 also serves to complete the pre-power FOD function. Here, the length of the negotiation phase is not restricted.

[0291] - Re-negotiation Phase: The re-negotiation phase can interrupt the power transmission phase 840 multiple times and generally serves to adjust a single element of the power transmission contract. Also, the FOD / qf, FOD / rf, and SRQ / rpr data packets may not be utilized during 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.

[0292] During the negotiation phase or the re-negotiation phase, an update of the power transmission contract may be performed to extend or modify the power transmission contract related to the reception / transmission of wireless power between the wireless power receiving device and the wireless power transmitting device, or to adjust at least a part of the elements of the power transmission contract, or an exchange of information for establishing out-of-band communication may be carried out.

[0293] FIG. 12 is a flowchart schematically showing a protocol of the negotiation phase or the re-negotiation phase according to an embodiment.

[0294] 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.

[0295] 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).

[0296] On the other 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).

[0297] 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 that the wireless power receiving device 200 requests from the wireless power transmitting device 100 by using the GRQ packet.

[0298] For example, at the negotiation stage or the renegotiation stage, the wireless power receiving device 200 can transmit a GRQ packet (GRQ / id) that requests the ID packet of the wireless power transmitting device 100 to the wireless power transmitting device 100 (S1220).

[0299] 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 includes information about the "Manufacturer Code". The ID packet including information about the "Manufacturer Code" enables the identification of the manufacturer of the wireless power transmitting device 100.

[0300] Alternatively, at the negotiation stage or the renegotiation stage, the wireless power receiving device 200 can transmit a GRQ packet (GRQ / cap) that requests 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).

[0301] Upon receiving GRQ / cap, the wireless power transmission device 100 can transmit a performance packet (CAP) to the wireless power reception device 200 (S1235).

[0302] 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).

[0303] Upon receiving GRQ / xcap, the wireless power transmission device 100 can transmit a performance packet (XCAP) to the wireless power reception device 200 (S1245).

[0304] FIG. 13 is a drawing showing the message field of the performance packet (CAP) of the wireless power transmission device according to an embodiment.

[0305] 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.

[0306] With reference 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.

[0307] 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 (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.

[0308] 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 is instructed to perform outband communication, and when the value of the outband (OB) flag is "0", it can be instructed that the wireless power transmission device 100 does not support outband communication.

[0309] During the negotiation phase, the wireless power receiving device 200 can receive the performance packet (CAP) of the wireless power transmission device 100 to confirm whether the authentication function support and outband communication support of the wireless power transmission device 100 are available.

[0310] 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 (specific request data packet, SRQ, Specific Request data packet) during the negotiation phase or the renegotiation phase (S1250), and can receive an ACK / NAK for this (S1255).

[0311] 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).

[0312] 4. Power Transmission Phase 840

[0313] 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.

[0314] <Power Control Based on CE>

[0315] The wireless power receiving device 200 can control the power level by transmitting 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. 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.

[0316] <In-power transfer FOD method>

[0317] 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 when the difference exceeds a threshold, it can send a signal to the wireless power receiving device 200 (regarding whether a foreign object has been monitored).

[0318] <Renegotiation phase>

[0319] Depending on the situation, if necessary, the wireless power transmitting device 100 or the wireless power receiving device 200 can request renegotiation of the power transmission contract during the power transmission phase. Examples of changed situations in which renegotiation of the power transmission contract can occur are as follows.

[0320] - When the wireless power receiving device 200 requires (substantially) more power than previously negotiated.

[0321] - When it is detected that the wireless power transmission device 100 is operating with low efficiency.

[0322] - 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 receiving device 200 can operate at a higher power level after being sufficiently cooled).

[0323] Here, an example of a specific protocol for the renegotiation phase is as described above.

[0324] <Data transmission stream>

[0325] The wireless power transmission device 100 and the wireless power receiving device 200 can start a data transmission stream and exchange application-level data throughout the entire power transmission phase 840.

[0326] Here, an important common application is authentication, where both sides can verify each other's credentials in an anti-modulation manner. For example, the wireless power receiving device 200 can attempt to verify the credentials of the wireless power transmission device 100 to confirm whether it can be trusted to operate safely at a high power level. With appropriate credentials, it can be meant that the regulatory compliance test has been passed.

[0327] Therefore, in this specification, a method can be provided to start power transmission at a low power level and control the power to a higher level only after successfully completing the authentication protocol.

[0328] <Protocol in the power transmission phase 840>

[0329] The operation between the wireless power transmission device 100 and the wireless power reception device 200 in the power transmission phase 840 has been schematically described 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 separately described.

[0330] FIG. 14 schematically shows a flowchart of the data flow for the power transmission phase 840 in the baseline protocol.

[0331] 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.

[0332] 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).

[0333] Optionally, the wireless power reception device 200 can transmit a CHS (charge status) data packet to the wireless power transmission device 100 (S1430).

[0334] If the above-described data packets are sorted and described, it is as follows.

[0335] -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.

[0336] -RP8: The RP8 data packet can report the received power level. Here, the RP8 data packet may be included only in the baseline protocol.

[0337] -CHS: The CHS data packet can provide the charging level of the battery under load.

[0338] FIG. 15 schematically shows a flowchart of the data flow for the power transmission phase 840 in the extended protocol.

[0339] According to FIG. 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.

[0340] 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).

[0341] 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.

[0342] 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.

[0343] 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).

[0344] 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.

[0345] 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.

[0346] 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).

[0347] 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).

[0348] The received power packet (RP / 1) with the aforementioned mode value of 1 can mean the first correction data point (the first calibration data point, first calibration data point), and the received power packet (RP / 2) with the mode value of 2 can mean an additional correction data point (an additional calibration data point, 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.

[0349] For the received power packet (RP), the wireless power transmitting device 100 responding with an 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 an 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.

[0350] Optionally, the wireless power receiving device 200 can transmit a CHS (charge status) data packet to the wireless power transmitting device 100 (S1525).

[0351] 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).

[0352] 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).

[0353] 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).

[0354] Here, if the data packets related to the start of the renegotiation phase are sorted out, it is as follows.

[0355] - DSR: Any one of the following values may be set in the DSR data packet.

[0356] i) 0x00 - DSR / nak: Indicates that the last data packet received from the wireless power transmitting device 100 was rejected.

[0357] ii) 0x33 - DSR / poll: Invites the wireless power transmitting device 100 to send a data packet.

[0358] iii) 0x55 - DSR / nd: Indicates that the last data packet received from the wireless power transmitting device 100 was not expected.

[0359] iv) 0xFF - DSR / ack: Confirms that the last data packet received from the wireless power transmitting device 100 was correctly processed.

[0360] - CAP: The CAP data packet provides information about the functions of the wireless power transmitting device 100. The specific content is as described above.

[0361] - NEGO: The NEGO data packet can request the wireless power transmitting device 100 to perform in the renegotiation phase.

[0362] The wireless power transmission device 100 and the wireless power reception device 200 can utilize ADC (auxiliary data transport), ADT (auxiliary data transport), and DSR data packets for the exchange of application-level data.

[0363] That is, from the perspective of transmitting and receiving a data transmission stream for the exchange of application-level data, the wireless power reception device 200 can transmit ADC / ADT to the wireless power transmission device 100 (S1550), and the wireless power transmission device 100 can transmit ACK / NAK to the wireless power reception device 200 as a response thereto (S1555). Also, the wireless power reception device 200 can transmit DSR to the wireless power transmission device 100 (S1560), and the wireless power transmission device can transmit ADC / ADT to the wireless power reception device (S1565).

[0364] 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.

[0365] Among the application-level data, messages / information related to the authentication application can be organized as follows.

[0366] A message used in the authentication procedure is called an authentication message. The authentication message is used to carry information related to authentication. There are two types of authentication messages. One is an authentication request, and the other is an authentication response. The authentication request is sent by the authentication initiator, and the authentication response is sent by the authentication responder. The wireless power transmission device and the receiving device can act as the authentication initiator or the authentication responder. For example, when the wireless power transmission device is the authentication initiator, the wireless power receiving device acts as the authentication responder, and when the wireless power receiving device is the authentication initiator, the wireless power transmission device acts as the authentication responder.

[0367] The authentication request message includes GET_DIGESTS, GET_CERTIFICATE, and CHALLENGE.

[0368] -GET_DIGESTS: This request can be used to search for the certificate chain digest. The wireless power receiving device 200 can request a desired number of digests at a time.

[0369] -GET_CERTIFICATE: This request is used to read a segment of the target certificate chain.

[0370] -CHALLENGE: This request can be used to start the authentication of the product device of the power transmission device.

[0371] The authentication response message includes DIGESTS, CERTIFICATE, CHALLENGE_AUTH, and ERROR.

[0372] -DIGESTS: The wireless power transmission device 100 can send the certificate chain summary using the DIGESTS response and report the slots containing the valid certificate chain summary.

[0373] -CERTIFICATE: This response can be used for the wireless power transmitter 100 to send the requested segment of the certificate chain.

[0374] -CHALLENGE_AUTH: The wireless power transmitter 100 can use CHALLENGE_AUTH to respond to the CHALLENGE request.

[0375] -ERROR: This response can be used for the power transmitter to send error information.

[0376] 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.

[0377] 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.

[0378] -Initial ADC data packet for opening the stream.

[0379] i) Message types included in the stream.

[0380] ii) Number of data bytes in the stream.

[0381] -Series of ADT data packets including the actual message.

[0382] -Final ADC / end data packet for closing the stream.

[0383] 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.

[0384] 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.

[0385] 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.

[0386] The ADC data packet is used to start 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.

[0387] 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.

[0388] 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.

[0389] An illustration for understanding the operation between the wireless power transmission device 100 and the wireless power reception device 200 in the power transmission phase 840 described above is as follows.

[0390] FIG. 17 shows a power control method according to an embodiment.

[0391] 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.

[0392] More specifically, the wireless power reception device selects a desired control point - a desired output current / voltage, the temperature at a specific location 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.

[0393] 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.

[0394] In the resonance mode, it may operate in a different manner from the inductive mode. In the resonance mode, a single wireless power transmitter needs to serve multiple wireless power receivers simultaneously. However, when controlling power transfer as in the above-described inductive mode, since the transmitted power is controlled by communication with a single wireless power receiver, it may be difficult to control power transfer to additional wireless power receivers. Therefore, in the resonance mode of this specification, the wireless power transmitter attempts to use a method in which it commonly transmits basic power and the wireless power receiver controls the amount of received power by controlling its own resonance frequency. However, even in such resonance mode operation, the method described with reference to FIG. 17 is not completely excluded, and additional transmitted power control may be performed by the method of FIG. 17.

[0395] Hereinafter, this specification will be described more specifically.

[0396] Wireless charging methods include a magnetic induction method that utilizes the magnetic induction phenomenon between a primary coil and a secondary coil, and a magnetic resonance method that transmits power by achieving magnetic resonance using frequencies in the range of several tens of kHz to several MHz. 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 WPC (Wireless Power Consortium) in terms of standards. Here, the WPC is designed to be able to exchange various status information and command words regarding the wireless charging system in-band.

[0397] FIG. 18 conceptually shows the structure of a power profile at the protocol level.

[0398] According to FIG. 18, as described above, the WPC standard defines a baseline power profile (BPP) and an extended power profile (EPP). The BPP relates to wireless power transmitting and receiving devices that support 5W power transmission, and the EPP relates to wireless power transmitting and receiving devices that support power transmission in a range greater than 5W and less than 30W.

[0399] In addition to this, in a wireless power transmission system, there is an attempt to provide a new power transmission profile, and among the power transmission profiles proposed at this time, there is an MPP (magnetic power profile). The MPP can be compatible with the dedicated extension of Apple (registered trademark) based on Qi v1.3.0.

[0400] Here, as can be seen from the drawings, the wireless power transmitting device and the wireless power receiving device basically support the BPP, and additionally, the wireless power transmitting device and the wireless power receiving device can support the BPP and the MPP simultaneously. On the same level line, the wireless power transmitting device and the wireless power receiving device can also support the BPP and the EPP simultaneously. In some cases, the wireless power transmitting device and the wireless power receiving device can also support all of the BPP, the EPP, and the MPP.

[0401] Hereinafter, the protocols for the BPP, the EPP, and the MPP will be described respectively.

[0402] A. Protocol for the BPP

[0403] FIG. 19 schematically shows the protocol for the BPP.

[0404] According to FIG. 19, the wireless power receiving device can transmit SS (signal strength) (in other expressions, SIG) to the wireless power transmitting device (in pin phase). Thereafter, the wireless power receiving device can transmit an ID packet to the wireless power transmitting device (in setup phase), and optionally, an XID packet can also be transmitted. And in the setup phase, the wireless power receiving device can transmit a CFG packet to the wireless power transmitting device. At this time, specific examples for each packet are as described above.

[0405] On the other hand, in the case of BPP, the wireless power receiving device may enter the power transmission phase without entering the negotiation phase, and the wireless power receiving device can receive wireless power from the wireless power transmitting device in the power transmission phase.

[0406] To summarize, in WPC Qi v1.3, the wireless power receiving device and / or the wireless power transmitting device basically perform the protocol based on the BPP structure, and when the wireless power receiving device and / or the wireless power transmitting device attempts to increase the power transmission amount, a protocol extended by EPP will be used.

[0407] B. Protocol in EPP

[0408] FIG. 20 schematically shows the protocol in EPP.

[0409] According to FIG. 20, the wireless power receiving device can transmit SS (signal strength) (in other expressions, SIG) to the wireless power transmitting device (in pin phase). Thereafter, the wireless power receiving device can transmit an ID packet to the wireless power transmitting device (in setup phase), and optionally, an XID packet can also be transmitted. And in the setup phase, the wireless power receiving device can transmit a CFG packet to the wireless power transmitting device.

[0410] On the other hand, when EPP is performed so as to be different from BPP, the "Neg" field in the CFG packet can be set to 1. Then, the wireless power receiving device can receive an ACK for the CFG from the wireless power transmitting device.

[0411] That is, EPP is an extended concept of BPP. When a wireless power receiving device that wants to perform EPP while the wireless power receiving device and the wireless power transmitting device are performing a protocol based on BPP, the "Neg" bit of the CFG packet can be set to 1. When the wireless power transmitting device supports EPP, it responds with an ACK to the CFG, and the wireless power transmitting device and the wireless power receiving device can switch to EPP. If the "Neg" bit of the CFG is 1 but the wireless power transmitting device is a BPP wireless power transmitting device, the BPP wireless power transmitting device does not execute the response to the above CFG. That is, when the response to the CFG is no response, both can perform wireless power transmission and reception based on BPP.

[0412] At this time, a more specific example of the CFG can be confirmed in FIG. 11 described above.

[0413] When the wireless power receiving device receives an ACK for the CFG from the wireless power transmitting device, the wireless power receiving device and the wireless power transmitting device can enter the negotiation phase. That is, the negotiation phase may correspond to a phase that does not exist in BPP. Here, "Nego" in the drawing may indicate a packet transmitted in the negotiation phase. At this time, a specific example of the packet transmitted in the negotiation phase is as described above.

[0414] Thereafter, based on the power transmission contract negotiated in the negotiation phase, wireless power transmission and reception based on EPP are performed between the wireless power transmitting device and / or the wireless power receiving device. If the negotiation fails in the negotiation phase, the wireless power transmitting device and / or the wireless power receiving device switches to BPP and performs wireless power transmission and reception based on BPP.

[0415] Protocol in C.MPP

[0416] In MPP, the wireless power receiving device and the wireless power transmitting device have a structure in which they start the protocol in BPP and then enter MPP. Therefore, the startup behavior of MPP is as follows.

[0417] Basically, the wireless power receiving device executes the initial operation by transmitting in the order of SIG (Signal Strength) → ID (Identification) → XID (Extended Identification) → PCH (Power Control Hold-Off; optional) → CFG (Configuration packet).

[0418] Here, SIG / ID may have the same configuration as that in the aforementioned BPP / EPP. If there is one difference, it is that in MPP, the XID packet must be transmitted, so in MPP, the "ext" bit in the ID packet is set to 1.

[0419] Hereinafter, the XID packet in MPP will be described more specifically.

[0420] FIG. 21 schematically shows an example of the XID packet in MPP.

[0421] According to FIG. 21, the XID packet in MPP may include a "XID Selector" field, a "Restricted" field, a "Freq Mask" field, etc.

[0422] Here, whether MPP is supported can be determined by whether the value of the "XID selector" is 0xFE. That is, when the value of B_0 of XID is 0xFE, the XID at this time may correspond to information indicating that the wireless power receiving device supports MPP.

[0423] The "Restricted" field may correspond to information indicating whether the wireless power receiving device operates in the MPP restricted mode or in the MPP full mode. If the wireless power receiving device selects to operate in the MPP restricted mode, the above field can be set to 1. On the other hand, in other cases (for example, when the wireless power receiving device selects not to operate in the MPP restricted mode), the above field can be set to 0.

[0424] The "Preferred Frequency" field can mean the frequency preferred by the MPP. Here, when the wireless power receiving device attempts to retrieve information from the wireless power transmitting device (in the negotiation phase) before frequency switching, this field can be set to 128 kHz. In other cases, the wireless power receiving device can set this field to 360 kHz.

[0425] The "Freq Mask" field corresponds to a field for determining whether the operating frequency of 360 kHz is supported. That is, when the "Freq Mask" field is set to 0, 360 kHz is supported.

[0426] To summarize, by determining whether the "Ext" bit of the ID received by the wireless power transmitting device from the wireless power receiving device is set to 1 and whether B_0 of the XID is set to 0xFE, the wireless power transmitting device can determine whether to support the MPP of the wireless power receiving device.

[0427] The following will describe the CFG packet in MPP in more detail.

[0428] FIG. 22 schematically shows an example of a CFG packet in MPP.

[0429] According to FIG. 22, the setting packet in MPP may basically be the same as the setting packet in BPP / EPP. And fields not used in MPP (AI, OB, Count, Neg, Pol, Depth, Buffer Size, Dup, etc.) may be set to 0, for example.

[0430] On the other hand, in MPP, two profiles may exist. One is the MPP Restricted mode (in other words, the MPP baseline profile), and the other is the MPP Full mode (in other words, the MPP full profile).

[0431] To briefly explain the difference between the two, in the MPP Restricted mode, the "restricted" field in XID is set to 1, while in the MPP Full mode, the "restricted" field in XID is set to 0.

[0432] And in the MPP Restricted mode, the wireless power receiving device does not transmit CFG at the first operating frequency (e.g., 128 kHz) or does not receive an ACK for this, while in the MPP Full mode, the wireless power receiving device transmits CFG and receives an MPP ACK pattern for this.

[0433] Also, in the MPP Restricted mode, the wireless power receiving device and the wireless power transmitting device do not perform negotiation, while in the MPP Full mode, the wireless power receiving device performs MPP negotiation.

[0434] Hereinafter, the MPP Restricted mode and the MPP Full mode will be described more specifically. Here, the MPP Restricted mode may be mixed with the MPP baseline profile, and the MPP Full mode may be mixed with the MPP full profile.

[0435] -MPP Baseline Profile (MPP Restricted Mode + Frequency Change)

[0436] When the wireless power receiving device enters the MPP limit mode, it starts to proceed with the MPP baseline profile. Here, in the MPP limit mode, FSK communication is not executed, and the operating frequency can only support 360 kHz. Also, in the case of 128 kHz, the Qi BPP protocol starts to proceed.

[0437] FIG. 23 schematically shows an example of the operation in the MPP baseline profile.

[0438] According to FIG. 23, the wireless power receiving device preferentially operates on the first operating frequency (e.g., 128 kHz). Then, when the operation on the first operating frequency is completely finished, the wireless power receiving device changes the operating frequency to the second operating frequency (e.g., 360 kHz) and executes the operation on the second operating frequency. More specifically, it is as follows.

[0439] The wireless power receiving device that attempts to execute the operation in the MPP baseline profile transmits a SIG to the wireless power transmitting device on the first operating frequency.

[0440] The wireless power receiving device transmits an ID packet to the wireless power transmitting device on the first operating frequency. At this time, when the wireless power receiving device attempts to execute the operation in the MPP baseline profile, since the wireless power receiving device must always transmit an XID packet to the wireless power transmitting device, the "Ext" bit in the ID is set to 1.

[0441] After that, the wireless power receiving device transmits an XID packet to the wireless power transmitting device on the first operating frequency. At this time, in order to notify that the wireless power receiving device supports the MPP operation, B0 in the XID packet can be set to 0xFE. And "Restricted" in the XID packet can be set to 1. Also, "Preferred Freq." in the XID packet can be set to, for example, the second operating frequency (e.g., 360 kHz).

[0442] After confirming that the wireless power receiving device itself operates in the MPP limit mode, the operation at the first operating frequency is interrupted. That is, the wireless power receiving device interrupts charging and resumes the pin phase.

[0443] The frequency at which the wireless power receiving device operates after restarting may be the second operating frequency (e.g., 360 kHz).

[0444] The wireless power receiving device can transmit SIG, ID, XID, and CFG packets to the wireless power transmitting device at the second operating frequency. And the wireless power receiving device can execute a wireless power transmission phase based on the wireless power transmitting device and the MPP baseline profile.

[0445] -MPP full profile (MPP full mode + frequency change)

[0446] FIG. 24 schematically shows an example of the operation in the MPP full profile.

[0447] According to FIG. 24, the wireless power receiving device preferentially operates on the first operating frequency (e.g., 128 kHz). And when the operation at the first operating frequency is completely finished, the wireless power receiving device changes the operating frequency to the second operating frequency (e.g., 360 kHz) and executes the operation at the second operating frequency. More specifically, it is as follows.

[0448] The wireless power receiving device that attempts to execute the operation in the MPP full profile transmits SIG to the wireless power transmitting device on the first operating frequency.

[0449] The wireless power receiving device transmits an ID packet to the wireless power transmitting device on the first operating frequency. At this time, when the wireless power receiving device attempts to execute the operation in the MPP full profile, since the wireless power receiving device must transmit an XID packet to the wireless power transmitting device, the "Ext" bit in the ID is set to 1.

[0450] The wireless power receiving device transmits an XID packet to the wireless power transmitting device at the first operating frequency. At this time, in order to notify that the wireless power receiving device supports the MPP operation, B0 in the XID packet can be set to 0xFE. And, by setting "Restricted" in the XID packet to 0, it can be notified that the wireless power receiving device attempts to operate in the MPP full mode. Also, "Preferred Freq." in the XID packet can be set to, for example, the second operating frequency (e.g., 360 kHz).

[0451] The wireless power receiving device can transmit a CFG packet to the wireless power transmitting device, and the wireless power receiving device can receive an MPP ACK as a response to the CFG packet. Here, the MPP ACK may have a pattern different from the bit pattern of the ACK used in the EPP. At this point, the wireless power receiving device can confirm whether the wireless power transmitting device supports the MPP or not.

[0452] The wireless power receiving device can enter the negotiation phase at the first operating frequency and proceed with the negotiation for the full MPP mode on the negotiation phase.

[0453] After the negotiation, the wireless power receiving device can transmit an EPT / rep to the wireless power transmitting device (e.g., enter the power transmission phase), and as a result, the power signal can be removed on the wireless power transmitting device and / or the wireless power receiving device. That is, the wireless power receiving device interrupts the charging, enters the MPP full mode, and resumes the pin phase.

[0454] The frequency at which the wireless power receiving device operates after restarting may be the second operating frequency (e.g., 360 kHz).

[0455] The wireless power receiving device can transmit SIG, ID, XID, and CFG packets to the wireless power transmitting device at the second operating frequency. And the wireless power receiving device can receive an MPP ACK as a response to the CFG packet transmitted at the second operating frequency.

[0456] The wireless power receiving device can enter the negotiation phase at the second operating frequency and further execute the negotiation for the full MPP mode on the negotiation phase.

[0457] After that, the wireless power receiving device can enter the power transmission phase, and the power transfer at this time can be executed based on full MPP.

[0458] Above, the BPP, EPP, and MPP protocols have been described. As mentioned above, there are similarities in the protocols among BPP, EPP, and MPP, but there are also obvious differences.

[0459] In the above situation, conventionally, BPP / EPP was developed with some consideration for the compatibility between the BPP wireless power transmitting device / wireless power receiving device and the EPP wireless power transmitting device / wireless power receiving device, so the compatibility problem did not occur significantly.

[0460] However, in the case of MPP, which is different from the above BPP / EPP, since not all of the protocols with BPP / EPP are used, there may be a compatibility problem between MPP and BPP / EPP. In particular, since the market dominance of the wireless power transmitting device and / or wireless power receiving device using the MPP standard is not low, conventionally, the problem regarding the compatibility between BPP / EPP and MPP may be maximized.

[0461] To solve such problems, it is necessary to provide a clear triggering for the profiles between BPP / EPP and MPP (for example, a configuration for identifying a BPP / EPP / MPP wireless power transmitter and / or a wireless power receiver, etc.). However, currently, there is no configuration provided for identifying the profiles between a BPP / EPP wireless power transmitter / wireless power receiver and an MPP wireless power transmitter / wireless power receiver.

[0462] Therefore, in this specification, a specific configuration for identifying the profiles between a BPP / EPP wireless power transmitter / wireless power receiver and an MPP wireless power transmitter / wireless power receiver will be described.

[0463] In particular, in this specification, a configuration will be provided that enables an MPP wireless power receiver to identify whether a wireless power transmitter is a BPP / EPP wireless power transmitter or an MPP wireless power transmitter by only checking the operating frequency of the wireless power transmitter.

[0464] 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.

[0465] FIG. 25 is a flowchart of a method for identifying the profile of a power transmitter according to an embodiment of this specification.

[0466] According to FIG. 25, a wireless power receiver can transmit a first ID packet to a wireless power transmitter (S2510). Here, the frequency at which the first ID packet is transmitted may be the first operating frequency, and at this time, the first operating frequency may be located between 100 kHz and 145 kHz (for example, 128 kHz).

[0467] The wireless power receiving device in FIG. 25 may be, for example, a wireless power receiving device that supports (or attempts to operate in) MPP. At this time, the wireless power receiving device may be, as described above, a wireless power receiving device that supports (or attempts to operate in) the MPP limit mode, or may be, as described above, a wireless power receiving device that supports (or attempts to operate in) the MPP full mode.

[0468] Here, as described above, when the wireless power receiving device is an MPP wireless power receiving device, it will transmit an XID packet to the wireless power transmitting device. Therefore, the wireless power receiving device can set information (e.g., "Ext" bit) indicating the presence or absence of the XID packet included in the ID packet to a value representing the presence of XID, and then the wireless power receiving device can transmit the resulting ID packet to the wireless power transmitting device.

[0469] The wireless power receiving device can transmit a first XID packet to the wireless power transmitting device (S2510). Here, the frequency at which the first XID packet is transmitted may be the first operating frequency. At this time, the first XID packet may include information indicating that the first XID packet is a packet related to MPP (magnetic power profile). Specifically, as described above, by setting B0 of the XID packet to 0xFE in the wireless power receiving device, the XID can notify the wireless power transmitting device that the wireless power receiving device is an MPP wireless power receiving device.

[0470] At this time, as described above, after initially operating at the first operating frequency, the MPP wireless power receiving device changes the operating frequency to a second operating frequency (e.g., 360 kHz) in order to execute the MPP power transfer operation.

[0471] On the other hand, for subsequent operations, there is a difference in the operating frequency between the wireless power transmitting device that executes (supports) the BPP / EPP operation and the wireless power transmitting device that executes (supports) the operating frequency and the MPP operation.

[0472] For example, even in the operations after executing (assisting) the BPP / EPP operation, at least one transmission operation of SIG, ID, XID, CFG, etc. will be executed at the first operating frequency.

[0473] However, the wireless power transmission device that executes (assists) the MPP operation first operates at the first operating frequency and then changes the operating frequency to the second operating frequency. And the wireless power transmission device that executes (assists) the MPP operation will execute at least one transmission operation of SIG, ID, XID, CFG, etc. on the second operating frequency.

[0474] Considering such a point, the wireless power receiving device can sense whether the wireless power transmission device is operating at the first operating frequency or the second operating frequency after the transmission of the first XID packet (S2530). The first operating frequency at this time may be different from the second operating frequency. And the first operating frequency may have a value between, for example, 100 kHz and 145 kHz, and the second operating frequency may have a value of, for example, 360 kHz.

[0475] Although the second operating frequency was exemplified as 360 kHz above, in the proposal of this specification, the second operating frequency is not limited to the above frequency. In particular, in the proposal of this specification, the wireless power receiving device may provide information about the second operating frequency to the wireless power transmission device (or the wireless power transmission device may provide information about the second operating frequency to the wireless power receiving device). At this time, the information notifying the second operating frequency can be transmitted, for example, via packets such as ID / XID / CFG / Prop described above.

[0476] Based on sensing that the wireless power transmission device is operating at the first operating frequency, the wireless power reception device can sense that the wireless power transmission device is a wireless power transmission device that performs operations based on BPP (baseline power profile) or EPP (extended power profile). After sensing, the wireless power reception device can transmit a second ID packet or the like on the first operating frequency.

[0477] Alternatively, based on sensing that the wireless power transmission device is operating at the second operating frequency, the wireless power reception device can sense that the wireless power transmission device is a wireless power transmission device that performs operations based on MPP. After sensing, the wireless power reception device can transmit a second ID packet and a second XID packet on the second operating frequency.

[0478] Here, the wireless power reception device can receive the wireless power from the wireless power transmission device based on MPP on the second operating frequency. The MPP operation executed by the wireless power transmission device at the second operating frequency may be, for example, an MPP operation based on the MPP limit mode or the MPP full mode.

[0479] The operation from the perspective of the MPP wireless power reception device has been described above. Below, for a more thorough understanding of the specification, the operations with the MPP wireless power reception device from the perspectives of the BPP wireless power transmission device, the EPP wireless power transmission device, and the MPP wireless power transmission device will be described respectively.

[0480] 1. Perspective of the BPP wireless power transmission device

[0481] If the profiles of the BPP wireless power transmission device and the wireless power reception device that can perform operations are described through a table, it is as follows.

[0482]

Table 2

[0483] (1) Case 1

[0484] In the case of BPP PTx and BPP PRx, since the same power profile exists between the PTx and the PRx, there is no need to switch the profile. That is, the BPP operation is executed between the wireless power transmission device and the wireless power reception device.

[0485] (2) Case 2

[0486] In the case of BPP PTx and EPP PRx, the PRx selects BPP / EPP first (by setting the "neg" field in the CFG to 0 or 1) between the PTx and the PRx, and the wireless power reception device determines whether an ACK is received from the PTX or not. Here, since the BPP wireless power transmission device does not transmit an ACK for the CFG marked with the "neg" field as 1, the EPP wireless power reception device can determine that the wireless power transmission device is a BPP wireless power transmission device based on the fact that an ACK for the CFG is not received from the wireless power transmission device. Thereafter, the wireless power transmission device and the wireless power reception device can perform a profile based on BPP.

[0487] (3) Case 3

[0488] This specification attempts to provide a specific protocol for the case of BPP PTx and MPP PRx. The reason is that, as described above, a protocol for assisting in mutual identification is provided between BPP and EPP, but currently there is no or an incomplete protocol for assisting in mutual identification between BPP and MPP, so there may be problems in wireless power transmission between the wireless power transmission device and the wireless power reception device.

[0489] Here, since PRx is MPP PRx, as described above, PRx can set the "Ext" bit of the ID to 1 and transmit the ID to the wireless power transmitter. After that, the wireless power receiver can transmit the XID with B0 having 0xFE to the wireless power transmitter. The "Preferred frequency" included in the XID at this time can be set to the second operating frequency (e.g., 360 kHz) as described above.

[0490] The MPP wireless power receiver selects whether to operate in the MPP baseline (MPP limit mode) or in MPP full (MPP full mode). At this time, as described above, since there is a large difference in operation between the MPP baseline operation and the MPP full operation, hereinafter, the configuration proposed in this specification will be described separately for the case of MPP baseline operation and the case of MPP full operation.

[0491] - Case 3-1 (In the case of MPP baseline)

[0492] FIG. 26 schematically shows the protocol when the wireless power receiver attempts to operate in the MPP limit mode.

[0493] According to FIG. 26, in the MPP limit mode, that is, in the case of MPP-Baseline, as described above, the wireless power receiver transmits the SIG, ID, and XID packets to the wireless power transmitter at the first operating frequency. At this time, as described above, the wireless power receiver sets the "Restricted mode" in the XID packet to 1.

[0494] After transmitting the XID packet, the wireless power receiver immediately ends charging. This can mean that the wireless power receiver attempting to enter the MPP limit mode does not transmit the CFG packet to the wireless power transmitter.

[0495] After that, PRx switches to the MPP restricted mode and switches to the MPP baseline profile (drive frequency is 360 kHz).

[0496] At this time, even if the BPP wireless power transmitter resumes the power transfer protocol after the wireless charging is completed, it cannot change the operating frequency. This is because the BPP wireless power transmitter can communicate only at the first operating frequency. In other words, the BPP PTx performs the power transfer protocol again with BPP (at the first operating frequency).

[0497] On the other hand, different from the BPP wireless power transmitter, the MPP wireless power transmitter can switch to the MPP baseline profile based on confirming that the wireless power receiver operates in the MPP restricted mode via the XID packet as described above. That is, the MPP wireless power transmitter can switch the operating frequency to the second operating frequency (for example, 360 kHz).

[0498] Considering such a background, the following will describe the configuration proposed above in which the wireless power receiver confirms the operating frequency of the wireless power transmitter and based on this, identifies whether the wireless power transmitter is a BPP wireless power transmitter or an MPP wireless power transmitter. And at this time, the protocol between the wireless power receiver and the wireless power transmitter according to the identification result will also be specifically described.

[0499] 1) PRx confirms the drive frequency of the PTx and based on this, confirms whether the PTx is MPP or BPP. That is, the wireless power receiver determines whether the drive frequency is the second operating frequency (360 kHz). If the operating frequency is not the second operating frequency (360 kHz), the wireless power receiver can regard the wireless power transmitter as a BPP ( / EPP) PTx.

[0500] In other words, if the driving frequency of the wireless power transmitter is not 360 kHz, the PRx can operate in BPP / EPP PRx which is not MPP PRx (SS-ID-XID / Optional-CFG-..., i.e., proceed as per the existing WPC standard). Here, since the wireless power receiver executes BPP / EPP PRx operation which is not MPP PRx, it may not use the MPP's ID / XID format. When the wireless power receiver supporting MPP operates in BPP / EPP PRx, since the wireless power transmitter is a BPP wireless power transmitter, it cannot receive a response to CFG. Therefore, the wireless power receiver supporting MPP will automatically operate in BPP PRx.

[0501] 1-1) At this time, the wireless power receiver can send SS (SIG), ID, XID, and CFG to the wireless power transmitter. And based on the fact that the wireless power receiver cannot receive a response (e.g., ACK) to the CFG it sent from the wireless power transmitter, the wireless power receiver can receive wireless power based on BPP from the wireless power transmitter.

[0502] 1-2) On the other hand, in 1-1, an example where the wireless power receiver sends an XID packet to the wireless power transmitter was described. The reason for the MPP wireless power receiver to send an XID packet at this time is to inform the wireless power transmitter that it is an MPP wireless power receiver (and / or whether to use the MPP restricted mode).

[0503] However, through the confirmation of the driving frequency, the wireless power receiver already knows that the wireless power transmitter does not support MPP operation. In such a situation, for the wireless power receiver to send an XID packet to the wireless power transmitter may be a waste of resources. Therefore, as in 1-2, the wireless power receiver may not need to send an XID packet to the wireless power transmitter.

[0504] That is, the wireless power receiving device can transmit SS (SIG), ID, and CFG to the wireless power transmitting device. Then, based on the fact that the wireless power receiving device cannot receive a response (e.g., ACK) to the CFG it sent from the wireless power transmitting device, the wireless power receiving device can receive wireless power from the wireless power transmitting device based on BPP.

[0505] 2) PRx checks the drive frequency of PTx and, based on this, checks whether PTx is MPP or BPP. That is, the wireless power receiving device determines whether the drive frequency is the second operating frequency (360 kHz). If the operating frequency is the second operating frequency (360 kHz), the wireless power receiving device can regard the wireless power transmitting device as an MPP PTx.

[0506] At this time, as described above, since the wireless power receiving device notifies the wireless power transmitting device that it is in the MPP restriction mode, the wireless power receiving device progresses the MPP - baseline profile at the second drive frequency. To progress the MPP baseline profile, the wireless power receiving device can transmit SIG, ID, XID, CFG packets, etc. to the wireless power transmitting device at the second drive frequency. Then, based on the MPP baseline, the wireless power receiving device can receive wireless power from the wireless power transmitting device. A specific example of the protocol based on the MPP baseline is as described above.

[0507] - Case 3 - 2 (when MPP is full)

[0508] Figure 27 schematically shows the protocol when the wireless power receiving device attempts to operate in the MPP full mode.

[0509] According to FIG. 27, when the MPP wireless power receiving device attempts to execute the MPP full operation, as described above, it can transmit SIG, ID, XID, and CFG packets to the wireless power transmitting device. At this time, the XID includes information (B0) indicating that the wireless power receiving device attempts to execute the MPP operation, and by setting "restricted" in the XID to 0, the wireless power receiving device can be instructed to attempt to execute the MPP full operation.

[0510] On the other hand, unlike the MPP restricted mode, the MPP wireless power receiving device attempting to execute the MPP full operation transmits a CFG packet to the wireless power transmitting device.

[0511] 1) At this time, in this case where the PTx is a BPP wireless power transmitting device, since the wireless power transmitting device executes the BPP operation, it does not respond to the CFG packet it received.

[0512] At this point, at the point where the PTx did not respond to the CFG, the wireless power receiving device can sense that the wireless power transmitting device is a BPP wireless power receiving device. In other words, based on the fact that the wireless power receiving device cannot receive a response to the CFG from the wireless power transmitting device until a timeout occurs, the wireless power receiving device can consider the wireless power transmitting device to be a BPP PTx. When the wireless power transmitting device is a BPP PTx, based on the non-response of the CFG, the wireless power receiving device and / or the wireless power transmitting device can enter the power transmission phase and perform charging.

[0513] 2) Alternatively, the wireless power receiving device can resume the protocol for wireless power transmission between the wireless power receiving device and / or the wireless power transmitting device by transmitting an EPT to the wireless power transmitting device. At this time, after resuming, the wireless power transmitting device and the wireless power receiving device can execute operations based on WPC Qi BPP.

[0514] On the one hand, not only does the wireless power receiving device identify the BPP wireless power transmitting device based on the above CFG or the like, but as described above, the wireless power receiving device attempting to execute the MPP full operation can identify whether the BPP of the wireless power transmitting device is available by identifying the operating frequency of the wireless power transmitting device. The specific details thereof are as described above.

[0515] 2. Perspective of the EPP wireless power transmitting device

[0516] If the profiles of the EPP wireless power transmitting device and the wireless power receiving device capable of executing the operation are described through a table, it is as follows.

[0517] [Table 3]

[0518] (4) Case 4

[0519] In the case of EPP PTx and BPP PRx, since the PRx is BPP, the wireless power receiving device notifies the PTx in the CFG Packet that it is a BPP PRx. Thereby, the PTx can switch (or operate) to the BPP Profile.

[0520] (5) Case 5

[0521] In the case of EPP PTx and EPP PRx, since the PTx and the PRx have the same power profile, there is no need to switch the profile. That is, between the wireless power transmitting device and the wireless power receiving device, the EPP operation will be executed.

[0522] (6) Case 6

[0523] This specification aims to provide specific protocols for the cases of EPPPTx and MPP PRx. The reason is that, as described above, a protocol for assisting in mutual identification is provided between BPP and EPP, but currently there is no or an incomplete protocol for assisting in mutual identification between EPP and MPP, which causes problems in wireless power transmission between the wireless power transmitter and the wireless power receiver.

[0524] Here, since PRx is MPP PRx, as described above, PRx can set the "Ext" bit of the ID to 1 and transmit the ID to the wireless power transmitter. Then, the wireless power receiver can transmit the XID with B0 being 0xFE to the wireless power transmitter. The "Preferred frequency" included in the XID at this time can be set to the second operating frequency (e.g., 360 kHz) as described above.

[0525] The MPP wireless power receiver selects whether to operate in the MPP baseline (MPP limit mode) or in MPP full (MPP full mode). At this time, as described above, since there is a large difference in operation between the MPP baseline operation and the MPP full operation, below, the configurations proposed in this specification will be described separately for the cases of MPP baseline operation and MPP full operation.

[0526] - Case 6-1 (for MPP baseline)

[0527] Prior to the specific description of Case 6-1, the wireless power transmitter that supports EPP may, in some cases, execute the BPP operation. At this time, when the wireless power transmitter that supports EPP executes the BPP operation, the operation in Case 3-1 above may be applied. The specific content regarding this is as described above.

[0528] Figure 28 schematically shows the protocol when the wireless power receiver attempts to operate in the MPP limit mode.

[0529] According to FIG. 28, in the MPP limit mode, that is, in the case of MPP-Baseline, as described above, the wireless power receiving device transmits SIG, ID, and XID packets to the wireless power transmitting device at the first operating frequency. At this time, as described above, the wireless power receiving device sets "Restricted mode" in the XID packet to 1.

[0530] Then, after transmitting the XID packet, the wireless power receiving device immediately terminates charging. This can mean that the wireless power receiving device attempting to enter the MPP limit mode does not transmit a CFG packet to the wireless power transmitting device.

[0531] After that, PRx switches to the MPP limit (Restricted) mode and switches to the MPP baseline profile (driving frequency is 360 kHz).

[0532] At this time, the EPP wireless power transmitting device cannot change the operating frequency even if wireless charging is terminated and the power transfer protocol is restarted. This is because the EPP wireless power transmitting device can communicate only at the first operating frequency. In other words, the EPP PTx restarts the power transfer protocol with EPP (from the first operating frequency).

[0533] On the other hand, different from the EPP wireless power transmitting device, the MPP wireless power transmitting device can switch to the MPP baseline profile based on confirming that the wireless power receiving device operates in the MPP limit mode via the XID packet as described above. That is, the MPP wireless power transmitting device can switch the operating frequency to the second operating frequency (for example, 360 kHz).

[0534] Considering such a background, the following will describe the configuration in which the wireless power receiving device proposed above checks the operating frequency of the wireless power transmitting device and, based on this, identifies whether the wireless power transmitting device is an EPP wireless power transmitting device or an MPP wireless power transmitting device. And at this time, the protocol between the wireless power receiving device and the wireless power transmitting device according to the identification result will also be specifically described.

[0535] 1) PRx checks the driving frequency of PTx and, based on this, checks whether PTx is MPP or EPP. That is, the wireless power receiving device determines whether the driving frequency is the second operating frequency (360 kHz). If the operating frequency is not the second operating frequency (360 kHz), the wireless power receiving device can regard the wireless power transmitting device as an EPP ( / BPP) PTx.

[0536] In other words, when the driving frequency of the wireless power transmitting device is not 360 kHz, PRx can operate in an EPP / BPP PRx that is not an MPP PRx (SS-ID-XID / Optional-CFG-..., that is, proceed according to the existing WPC standard). Here, since the wireless power receiving device operates in an EPP / BPP PRx that is not an MPP PRx, it is not necessary to use the MPP's ID / XID format. When the wireless power receiving device operates as an EPPPRx, if the wireless power transmitting device is an EPP wireless power transmitting device, it can receive a response to the CFG, and at this time, the wireless power receiving device executes the EPP operation. On the other hand, when the wireless power receiving device operates as a BPP wireless power receiving device, it cannot receive a response to the CFG even if the wireless power transmitting device is an EPP wireless power transmitting device. Therefore, the wireless power receiving device automatically operates as a BPP PRx.

[0537] 1-1) At this time, the wireless power receiving device can transmit SS (SIG), ID, XID, CFG (by setting the "neg" bit to 1 at this time, it can be instructed to execute negotiation) to the wireless power transmitting device. Then, based on receiving a response (e.g., ACK) to the CFG it sent from the wireless power transmitting device, the wireless power receiving device can execute negotiation with the wireless power transmitting device by EPP. After that, the wireless power receiving device can receive wireless power from the wireless power transmitting device based on EPP.

[0538] 1-2) On the other hand, in 1-1, an example where the wireless power receiving device transmits an XID packet to the wireless power transmitting device was described. At this time, the reason the MPP wireless power receiving device transmits the XID packet is to notify the wireless power transmitting device that it is an MPP wireless power receiving device (and / or whether it uses the MPP restriction mode).

[0539] However, by checking the drive frequency, the wireless power receiving device already knows that the wireless power transmitting device does not support MPP operation. In such a situation, for the wireless power receiving device to transmit an XID packet to the wireless power transmitting device may be a waste of resources. Therefore, as in 1-2, the wireless power receiving device may not transmit an XID packet to the wireless power transmitting device.

[0540] That is, the wireless power receiving device can transmit SS (SIG), ID, CFG (by setting the "neg" bit to 1 at this time, it can be instructed to execute negotiation) to the wireless power transmitting device. Then, based on receiving a response (e.g., ACK) to the CFG it sent from the wireless power transmitting device, the wireless power receiving device can execute negotiation with the wireless power transmitting device by EPP. After that, the wireless power receiving device can receive wireless power from the wireless power transmitting device based on EPP.

[0541] 2) The PRx checks the drive frequency of the PTx and, based on this, checks whether the PTx is in MPP or EPP. That is, the wireless power receiving device determines whether the drive frequency is the second operating frequency (360 kHz). When the operating frequency is the second operating frequency (360 kHz), the wireless power receiving device can regard the wireless power transmitting device as an MPP PTx.

[0542] At this time, as described above, since the wireless power receiving device notifies the wireless power transmitting device that it is in the MPP limit mode, the wireless power receiving device performs an MPP-based baseline profile at the second drive frequency. To perform the MPP baseline profile, the wireless power receiving device can transmit SIG, ID, XID, CFG packets, etc. to the wireless power transmitting device at the second drive frequency. Then, based on the MPP baseline, the wireless power receiving device can receive wireless power from the wireless power transmitting device. A specific example of the protocol based on the MPP baseline is as described above.

[0543] - Case 6-2 (when MPP is full)

[0544] Prior to the specific description of Case 6-2, the wireless power transmitting device that supports EPP can, in some cases, perform a BPP operation. At this time, when the wireless power transmitting device that supports EPP performs a BPP operation, the operation in the above Case 3-2 may be applied. The specific content regarding this is as described above.

[0545] Figure 29 schematically shows the protocol when the wireless power receiving device attempts to operate in the MPP full mode.

[0546] According to FIG. 29, when the MPP wireless power receiving device attempts to execute the MPP full operation, as described above, it can transmit SIG, ID, XID, and CFG packets to the wireless power transmitting device. At this time, the XID includes information (B0) indicating that the wireless power receiving device attempts to execute the MPP operation, and by setting "restricted" in the XID to 0, it can be indicated that the wireless power receiving device attempts to execute the MPP full operation.

[0547] On the other hand, unlike the MPP restricted mode, the MPP wireless power receiving device attempting to execute the MPP full operation transmits a CFG packet to the wireless power transmitting device.

[0548] 1) At this time, in this case, when the PTx is an EPP wireless power transmitting device, since the wireless power transmitting device executes the EPP operation, it can execute an ACK response to the received CFG packet. And the ACK at this time corresponds to EPPACK.

[0549] At this point, at the point where the PTx transmitted the EPPACK, the wireless power receiving device can sense that the wireless power transmitting device is an EPP wireless power receiving device. When the wireless power transmitting device is an EPPPTx, the wireless power receiving device and / or the wireless power transmitting device (supporting not only MPP but also EPP) can execute the WPC Qi EPP operation. That is, in the negotiation phase, after the negotiation based on EPP progresses, it enters the power transmission phase and charging can be performed.

[0550] 2) Alternatively, the wireless power receiving device can resume the protocol for wireless power transmission between the wireless power receiving device and / or the wireless power transmitting device by transmitting an EPT to the wireless power transmitting device. At this time, after resuming, the wireless power transmitting device and the wireless power receiving device can execute an operation based on WPC Qi EPP.

[0551] On the one hand, not only is the configuration such that the wireless power receiving device identifies the EPP wireless power transmitting device in response to the EPPACK response to the upper CFG, but as described above, the wireless power receiving device attempting to execute the MPP full operation can identify the EPP ( / BPP) availability of the wireless power transmitting device by identifying the operating frequency of the wireless power transmitting device. The specific details regarding this are as described above.

[0552] 3. Perspective of the MPP wireless power transmitting device

[0553] If the profiles of the MPP wireless power transmitting device and the wireless power receiving device capable of executing the operation are explained through a table, it is as follows.

[0554]

Table 4

[0555] (1) Case 7

[0556] In the case of MPP PTx and BPP PRx, PRx does not send the XID which indicates the presence or absence of MPP support. (Since the wireless power receiving device sets the "neg" field in the CFG to 0, indicating that the wireless power receiving device executes the BPP operation), PTx can know that the wireless power receiving device is BPP. Therefore, both the wireless power transmitting device and the wireless power receiving device can execute the BPP operation.

[0557] (2) Case 8

[0558] In the case of MPP PTx and EPP PRx, PRx does not send the XID which indicates the presence or absence of MPP support, and can set the "Neg" bit to 1 in the CFG packet to notify that the wireless power receiving device executes the EPP operation. Therefore, PTx can know that the wireless power receiving device is EPP. Thus, (if the wireless power transmitting device only supports BPP / MPP), both PRx and PTx can execute the BPP operation.

[0559] (3) Case 9

[0560] In the case of MPP PTx and MPP PRx, since the PTx and PRx have the same power profile, there is no need to switch the profile.

[0561] The above specifically described the embodiments of this specification. If the above-described content is organized again, it can be organized as follows.

[0562] In this specification, PRx can inform PTx whether it has BPP / EPP / MPP support. Here, PTx can confirm whether the wireless power receiving device needs BPP through the neg bit of the CFG sent by PRx. The wireless power transmitting device can confirm whether the wireless power receiving device needs EPP through the Neg bit of the CFG sent by PRx. The wireless power transmitting device can confirm whether the wireless power receiving device needs MPP by checking the ID / XID, and can confirm whether the wireless power receiving device is an MPP wireless power receiving device and / or whether it is an MPP-Baseline / Full wireless power receiving device.

[0563] In such a situation, it is impossible for PRx to confirm whether PTx has BPP / EPP / MPP support.

[0564] Therefore, in this specification, based on the highest protocol level supported by the PRx device, the highest protocol level supported by PTx is confirmed, and the wireless power transmitting device and the wireless power receiving device are configured to operate at the highest protocol level that they commonly support each other. Here, PRx does not need to increase the operating protocol level before confirming the highest protocol level supported by PTx.

[0565] In the case of BPP PTx, (in the case of BPP / EPP PRx, no problem) after assuming MPP PTx operation (checking for B0 in the XID packet, presence / absence of 0xFE, and presence / absence of 360 kHz operation), the MPP PRx checks for the presence / absence of MPP support. Then, after assuming the presence / absence of subsequent EPP PTx support, when not operating and not supported, it operates in BPP.

[0566] In the case of BPP PTx, (in the case of BPP / EPP PRx, no problem) after assuming MPP PTx operation, the MPP PRx checks for the presence / absence of MPP support. When not operating and not supported, it operates in BPP.

[0567] In the case of EPP PTx, (in the case of BPP / EPP PRx, no problem) after assuming MPP PTx operation, the MPP PRx checks for the presence / absence of MPP support. When not supported, it operates in EPP. Also, when not supported, EPP operates in BPP.

[0568] In the case of EPP PTx, (in the case of BPP / EPP PRx, no problem) after assuming MPP PTx operation, the MPP PRx checks for the presence / absence of MPP support. When not supported, it operates in BPP.

[0569] Hereinafter, the embodiments of the present specification described above will be described through flowcharts for the case where the wireless power receiving device fails to detect a change in the operating frequency and for the case where the wireless power receiving device detects a change in the operating frequency, respectively.

[0570] FIG. 30 is a flowchart for an example where the wireless power receiving device fails to detect a change in the operating frequency.

[0571] According to FIG. 30, a wireless power receiving device attempting to execute MPP operation can transmit a first ID packet to the wireless power transmitting device (on the first operating frequency) (S3010). Here, the first ID packet may include information indicating the presence / absence of a first XID (extended ID) packet.

[0572] The wireless power receiving device can transmit a first XID packet to the wireless power transmitting device (on the first operating frequency) (S3020). Here, the first XID packet may include information indicating that the first XID packet is a packet related to the MPP (magnetic power profile).

[0573] The wireless power receiving device can sense that the wireless power transmitting device is operating at the first operating frequency (S3030).

[0574] Thereafter, the wireless power receiving device can transmit a second ID packet to the wireless power transmitting device (on the first operating frequency) (S3040).

[0575] The specific example for this illustration is as described above.

[0576] FIG. 31 is a flowchart for an example when the wireless power receiving device senses that the operating frequency has changed.

[0577] According to FIG. 31, the wireless power receiving device attempting to execute the MPP operation can transmit a first ID packet to the wireless power transmitting device (on the first operating frequency) (S3110). Here, the first ID packet may include information indicating the presence or absence of a first XID (extended ID) packet.

[0578] The wireless power receiving device can transmit a first XID packet to the wireless power transmitting device (on the first operating frequency) (S3120). Here, the first XID packet may include information indicating that the first XID packet is a packet related to the MPP (magnetic power profile).

[0579] The wireless power receiving device can sense that the wireless power transmitting device is operating at the second operating frequency (S3130).

[0580] After that, the wireless power receiving device can transmit a second ID packet to the wireless power transmitting device (on the second operating frequency) (S3140).

[0581] Then, the wireless power receiving device can execute a wireless power transmission operation based on MPP (S3150).

[0582] Specific examples for this illustration are as described above.

[0583] Hereinafter, the embodiments of this specification will be further described from various subjective perspectives.

[0584] 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 by way of example, the technical features of this specification are not limited to the specific names used in the following drawings.

[0585] FIG. 32 is a flowchart of a method for receiving wireless power executed by a wireless power receiving device according to an embodiment of this specification.

[0586] According to FIG. 32, the wireless power receiving device can transmit a first ID (identification) packet to the wireless power transmitting device at a first operating frequency (S3210). Here, the first ID packet may include information indicating the presence or absence of a first XID (extended ID) packet.

[0587] The wireless power receiving device can transmit the first XID packet to the wireless power transmitting device at the first operating frequency (S3220). Here, the first XID packet may include information indicating that the first XID packet is a packet related to the MPP.

[0588] After transmitting the first XID packet, the wireless power receiving device can sense whether the wireless power transmitting device is operating at the first operating frequency or the second operating frequency (S3230).

[0589] For example, based on sensing that the wireless power transmitting device is operating at the first operating frequency, the wireless power receiving device can sense that the wireless power transmitting device is a wireless power transmitting device that performs operations based on BPP (baseline power profile) or EPP (extended power profile). Also, after the sensing, the wireless power receiving device can transmit a second ID packet on the first operating frequency.

[0590] Alternatively, for example, based on sensing that the wireless power transmitting device is operating at the second operating frequency, the wireless power receiving device can sense that the wireless power transmitting device is a wireless power transmitting device that performs operations based on the MPP. Here, the wireless power receiving device can receive the wireless power from the wireless power transmitting device based on the MPP on the second operating frequency. Also, after the sensing, the wireless power receiving device can transmit a second ID packet and a second XID packet on the second operating frequency.

[0591] After transmitting the first XID packet, the wireless power receiving device can change the operating frequency from the first operating frequency to the second operating frequency. The first operating frequency may be different from the second operating frequency. For example, the first operating frequency may have a value between 100 kHz and 145 kHz, and the second operating frequency may have a value of 360 kHz.

[0592] On the other hand, the wireless power receiving device can transmit information for informing the wireless power transmitting device of the second operating frequency. Here, the information for informing of the second operating frequency may be included in the first XID packet.

[0593] The first XID packet may include information indicating that the wireless power receiving device executes an operation in a limited MPP mode.

[0594] Although not shown separately, this specification can provide a wireless power receiving device that supports MPP (magnetic power profile). The wireless power receiving device may include a power pickup device related to receiving wireless power from a wireless power transmitting device, and a communication / controller related to communicating with the wireless power transmitting device and controlling the reception of the wireless power. The wireless power receiving device transmits a first ID (identification) packet to the wireless power transmitting device at a first operating frequency, and the first ID packet includes information indicating the presence or absence of a first XID (extended ID) packet. The first XID packet is transmitted to the wireless power transmitting device at the first operating frequency, and the first XID packet includes information indicating that the first XID packet is a packet related to the MPP. After transmitting the first XID packet, the wireless power receiving device may sense whether the wireless power transmitting device is operating at the first operating frequency or at a second operating frequency.

[0595] FIG. 33 is a flowchart of a method for transmitting wireless power executed by a wireless power transmitting device according to an embodiment of this specification.

[0596] According to FIG. 33, the wireless power transmitting device can receive a first ID (identification) packet from the wireless power receiving device at a first operating frequency (S3310). The first ID packet may include information indicating the presence or absence of a first XID (extended ID) packet.

[0597] The wireless power transmitter can receive the first XID packet from the wireless power receiver at the first operating frequency (S3320). The first XID packet may include information indicating that the first XID packet is a packet related to the MPP (magnetic power profile).

[0598] After receiving the first XID packet, the wireless power transmitter can execute a change in the operating frequency from the first operating frequency to a second operating frequency (S3330).

[0599] Although not shown separately, this specification can provide a wireless power transmitter that supports an MPP (magnetic power profile). The wireless power transmitter may include a power converter related to transmitting wireless power to a wireless power receiver, and a communicator / controller related to communicating with the wireless power receiver and controlling the transmission of the wireless power. The wireless power transmitter receives a first ID (identification) packet from the wireless power receiver at a first operating frequency, the first ID packet includes information indicating the presence or absence of a first XID (extended ID) packet, receives the first XID packet from the wireless power receiver at the first operating frequency, the first XID packet includes information indicating that the first XID packet is a packet related to the MPP (magnetic power profile), and after receiving the first XID packet, executes a change in the operating frequency from the first operating frequency to a second operating frequency. It may be a wireless power transmitter characterized by this.

[0600] Hereinafter, the effects of this specification will be described.

[0601] To explain the effects of the specification, if we explain the above-mentioned problems again, it is as follows. Since BPP / EPP was developed with some consideration for the compatibility between the BPP wireless power transmitter / wireless power receiver and the EPP wireless power transmitter / wireless power receiver, compatibility problems did not occur significantly.

[0602] However, in the case of MPP, which is different from the above BPP / EPP, since it does not use all the protocols of BPP / EPP, MPP may have compatibility problems with BPP / EPP. In particular, since the market dominance of wireless power transmitters and / or wireless power receivers using the MPP standard is not low, conventionally, the problem of compatibility between BPP / EPP and MPP may be maximized.

[0603] As an example, conventionally, when a wireless power receiver attempts to operate in the MPP restricted mode, after the wireless power receiver sends an XID packet at the first operating frequency (e.g., which cannot be recognized by the wireless power transmitter), it does not send a CFG packet and immediately removes the power signal.

[0604] In such a situation, the wireless power transmitter (which cannot recognize the XID packet related to MPP) cannot interpret the XID packet it received, so it does not understand that the wireless power receiver is performing an MPP-related operation. Furthermore, in this process, since the wireless power transmitter also does not receive a CFG packet from the wireless power receiver, it resumes the pin phase at the first operating frequency (e.g., based on a timeout, etc.).

[0605] On the other hand, a wireless power receiver attempting to operate in the MPP restricted mode will perform a frequency conversion to the second operating frequency due to the MPP restricted mode, and then execute the wireless power protocol on the second operating frequency.

[0606] However, as described above, since the wireless power transmission device still operates at the first operating frequency, there is a problem that power transmission becomes impossible between the wireless power transmission device operating at the first operating frequency and the wireless power reception device operating at the second operating frequency.

[0607] In order to solve the above problems, in this specification, a configuration is provided in which the MPP wireless power reception device can identify whether the wireless power transmission device is a BPP / EPP wireless power transmission device or an MPP wireless power transmission device by only checking the operating frequency of the wireless power transmission device.

[0608] That is, according to this specification, the wireless power reception device attempting to execute the MPP operation can check the operating frequency of the wireless power transmission device without immediately executing the wireless power transmission related protocol on the second operating frequency. As a result, when the wireless power transmission device executes the BPP / EPP operation, the wireless power reception device attempting to execute the MPP operation does not execute a frequency transition to the second operating frequency and executes the BPP or EPP operation on the first operating frequency.

[0609] This prevents the above-described problem that the operating frequency at which the wireless power transmission device operates and the operating frequency at which the wireless power reception device operates are different and the power transmission protocol cannot be executed between them due to a communication dropout between them. As a result, there is an effect that stable power transmission can be executed even between a wireless power transmission device and a wireless power reception device that use other protocols between them.

[0610] The effects obtained through a specific example in 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.

[0611] 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 embodied in an apparatus, or the technical features of the apparatus claims in this specification may be combined and embodied 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 embodied 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 embodied in a method.

Claims

1. 1. A method for receiving wireless power in a wireless power transmission system, the method comprising: This is performed by a wireless power receiving device that supports MPP (magnetic power profile), Transmitting a first identification (ID) packet to a wireless power transmitting device at a first operating frequency, the first ID packet including information indicating the presence or absence of a first extended ID (XID) packet; transmitting the first XID packet to the wireless power transmission device at the first operating frequency; the first XID packet includes information indicating that the first XID packet is a packet related to the MPP; A method according to claim 1, wherein an operating frequency between the wireless power receiving device and the wireless power transmitting device is configured from the first operating frequency to a second operating frequency after transmitting the first XID packet.

2. The method of claim 1 , wherein the wireless power receiving device receives the wireless power from the wireless power transmitting device based on the MPP on the second operating frequency.

3. The method of claim 1 , wherein the wireless power receiving device transmits a second ID packet and a second XID packet on the second operating frequency.

4. The method of claim 1 , wherein the wireless power receiving device transmits information informing the wireless power transmitting device of the second operating frequency.

5. The method of claim 1 , wherein the first XID packet includes information indicating that the wireless power receiving device operates in a limited MPP mode.

6. The method of claim 1 , wherein the first operating frequency is different from the second operating frequency.

7. the first operating frequency has a value between 100 kHz and 145 kHz; The method of claim 6 , wherein the second operating frequency has a value of 360 kHz.

8. A wireless power receiving device that supports a magnetic power profile (MPP), a power pick-up associated with receiving wireless power from a wireless power transmitting device; a communicator / controller associated with communicating with the wireless power transmitting device and controlling the reception of the wireless power; The wireless power receiving device includes: Transmitting a first identification (ID) packet to the wireless power transmitting device at a first operating frequency, the first ID packet including information indicating the presence or absence of a first extended ID (XID) packet; Transmitting the first XID packet to the wireless power transmission device at the first operating frequency; the first XID packet includes information indicating that the first XID packet is a packet related to the MPP; An operating frequency between the wireless power receiving device and the wireless power transmitting device is configured from the first operating frequency to a second operating frequency after transmitting the first XID packet.

9. 1. A method for transmitting wireless power in a wireless power transmission system, the method comprising: This is performed by a wireless power transmission device that supports MPP (magnetic power profile), receiving a first identification (ID) packet from a wireless power receiving apparatus at a first operating frequency, the first ID packet including information indicating the presence or absence of a first extended ID (XID) packet; receiving the first XID packet from the wireless power receiving device at the first operating frequency; the first XID packet includes information indicating that the first XID packet is a packet related to MPP; A method, wherein an operating frequency between the wireless power transmitting device and the wireless power receiving device is configured from the first operating frequency to a second operating frequency after receiving the first XID packet.

10. A wireless power transmission device that supports a magnetic power profile (MPP), a power converter associated with transmitting wireless power to a wireless power receiving device; a communicator / controller associated with communicating with the wireless power receiving device and controlling the transmission of the wireless power; The wireless power transmission device includes: receiving a first identification (ID) packet from the wireless power receiving apparatus at a first operating frequency, the first ID packet including information indicating the presence or absence of a first extended ID (XID) packet; receiving the first XID packet from the wireless power receiving device at the first operating frequency; the first XID packet includes information indicating that the first XID packet is a packet related to MPP; An operating frequency between the wireless power transmitting device and the wireless power receiving device is configured from the first operating frequency to a second operating frequency after receiving the first XID packet.

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