METHOD AND APPARATUS FOR PROVIDING MPP COMPATIBILITY IN A WIRELESS POWER TRANSMISSION SYSTEM - Patent application

Abstract

A method for receiving wireless power and a device for utilizing the same are provided. [Solution] A method for receiving wireless power performed by a wireless power receiving device that supports MPP (magnetic power profile) in a wireless power transmission system includes transmitting a first ID (identification) 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 XID (extended ID) packet, transmitting the first XID packet to the wireless power transmitting device at the first operating frequency, the first XID packet including information indicating that the first XID packet is a packet related to the MPP, and after transmitting the first XID packet, detecting whether the wireless power transmitting device is operating at the first operating frequency or a second operating frequency.

Description

[Technical Field]

[0001] This specification relates to wireless power transmission. [Background technology]

[0002] Wireless power transmission technology is a technology that wirelessly transmits power between a power source and an electronic device. For example, wireless power transmission technology allows a wireless device, such as a smartphone or tablet, to be charged simply by placing the device on a wireless charging pad, thereby providing greater mobility, convenience, and safety than existing wired charging environments that use wired charging connectors. In addition to wireless charging of wireless devices, wireless power transmission technology is gaining attention as a potential alternative to existing wired power transmission environments in a variety of fields, including electric vehicles, various wearable devices such as Bluetooth earphones and 3D glasses, home appliances, furniture, underground facilities, buildings, medical devices, robots, and leisure activities.

[0003] The wireless power transmission method is also called a contactless power transmission method, a no-point-of-contact power transmission method, or a wireless charging method. A wireless power transmission system may include a wireless power transmitter that supplies electric energy to the wireless power transmission method, and a wireless power receiver that receives the electric energy wirelessly from the wireless power transmitter and supplies power to a power receiver such as a battery cell.

[0004] There are various wireless power transmission technologies, including those that transmit power through magnetic coupling, radio frequency (RF), microwave, and ultrasonic waves. Furthermore, magnetic coupling-based methods are classified into magnetic induction and magnetic resonance. Magnetic induction transmits energy by using a current induced in a receiving coil by a magnetic field generated in a battery cell in the transmitting coil through electromagnetic coupling between the transmitting and receiving coils. Magnetic resonance is similar to magnetic induction in that it uses a magnetic field. However, magnetic resonance differs from magnetic induction in that it transmits energy by generating resonance when a specific resonant frequency is applied to the transmitting and receiving coils, resulting in the concentration of magnetic fields at both ends of the transmitting and receiving coils.

[0005] Meanwhile, the present invention provides a method for identifying profiles between a BPP / EPP wireless power transmitter / receiver and an MPP wireless power transmitter / receiver in wireless charging, and a device using the same. Summary of the Invention [Problem to be solved by the invention]

[0006] According to one embodiment of the present specification, a method and apparatus can be provided for transmitting a first XID packet to the wireless power transmission 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 detecting whether the wireless power transmission device is operating at the first operating frequency or a second operating frequency after transmitting the first XID packet. [Effects of the Invention]

[0007] According to the present specification, the compatibility problem between PTx / PRx of MPP / BPP / EPP can be solved, and a stable protocol progress can be provided through clear trigger confirmation of MPP / BPP / EPP.

[0008] The effects obtained by the specific examples of the present 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 the present specification. Therefore, the specific effects of the present specification are not limited to those explicitly described in the present specification, but may include various effects that can be understood or derive from the technical features of the present specification. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a block diagram of a wireless power system 10 according to an embodiment. [Figure 2] FIG. 1 is a block diagram of a wireless power system 10 according to another embodiment. [Figure 3] 1 illustrates various examples of electronic devices in which a wireless power transmission system may be implemented. [Figure 4] 1 is a block diagram of a wireless power transmission system according to an embodiment; [Figure 5] 1 is a diagram illustrating an example of a Bluetooth communication architecture to which an embodiment of the present specification can be applied. [Figure 6] FIG. 1 is a block diagram illustrating a wireless power transmission system using BLE communication according to an example. [Figure 7] FIG. 10 is a block diagram illustrating a wireless power transmission system using BLE communication according to another example. [Figure 8] FIG. 2 is a state transition diagram illustrating a wireless power transmission process. [Figure 9]An example of a protocol for the PIN phase 810 is shown in outline. [Figure 10] An example of a protocol for the configuration phase 820 is shown in outline. [Figure 11] 10 is a diagram illustrating a message field of a configuration packet (CFG) of a wireless power receiving apparatus according to an embodiment. [Figure 12] 1 is a flow diagram illustrating a protocol for a negotiation or renegotiation phase according to one embodiment. [Figure 13] 10 is a diagram illustrating a message field of a performance packet (CAP) of a wireless power transmitter according to an embodiment. [Figure 14] 8. A schematic diagram of the data flow for the power transmission phase 840 in the baseline protocol is shown. [Figure 15] 8. A schematic diagram of the data flow for the power transmission phase 840 in the extended protocol is shown. [Figure 16] 1 illustrates an application-level data stream between the wireless power transmitting apparatus 100 and the wireless power receiving apparatus 200 according to an example. [Figure 17] 1 illustrates a power control method according to an embodiment. [Figure 18] This shows conceptually the structure of the power profile at the protocol level. [Figure 19] This outlines the protocol at BPP. [Figure 20] This is a rough outline of the protocol in EPP. [Figure 21] This is a rough example of an XID packet in MPP. [Figure 22] This is a rough example of a CFG package in MPP. [Figure 23] This is a rough example of the operation in the MPP baseline profile. [Figure 24] This is a rough example of how it works in MPP full profile. [Figure 25] 1 is a flow diagram of a method for identifying a profile of a power transmission device according to an embodiment of the present disclosure. [Figure 26] This is a schematic diagram of a protocol when a wireless power receiving device is to operate in MPP limited mode. [Figure 27] This is a schematic diagram of a protocol when a wireless power receiving device is to operate in MPP full mode. [Figure 28] This is a schematic diagram of a protocol when a wireless power receiving device is to operate in MPP limited mode. [Figure 29] This is a schematic diagram of a protocol when a wireless power receiving device is to operate in MPP full mode. [Figure 30] 10 is a flowchart illustrating an example in which the wireless power receiving device fails to detect that the operating frequency has been changed. [Figure 31] 10 is a flowchart illustrating an example in which a wireless power receiving device detects that an operating frequency has been changed. [Figure 32] 1 is a flowchart of a method for receiving wireless power performed by a wireless power receiving device according to an embodiment of the present specification. [Figure 33] 1 is a flow chart of a method for transmitting wireless power performed by a wireless power transmitting device according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0010] As used herein, "A or B" can mean "A only," "B only," or "both A and B." Alternatively, as used herein, "A or B" can be interpreted as "A and / or B." For example, as used herein, "A, B, or C" can mean "A only," "B only," "C only," 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." Therefore, "A / B" can mean "A only," "B only," 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 "A only," "B only," or "both A and B." Furthermore, as used herein, the expressions "at least one of A or B" and "at least one of A and / or B" can be interpreted as "at least one of A and B."

[0013] Furthermore, in this specification, "at least one of A, B and C" can mean "A only," "B only," "C only," or "any combination of A, B and C." Furthermore, "at least one of A, B or C" or "at least one of A, B and / or C" can mean "at least one of A, B and C."

[0014] Furthermore, parentheses used herein may mean "for example." Specifically, when "control information (PDCCH)" is used, "PDCCH" is proposed as an example of "control information." In other words, "control information" in this specification is not limited to "PDCCH," and "PDDCH" is proposed as an example of "control information." Furthermore, when "control information (i.e., PDCCH)" is used, "PDCCH" is proposed as an example of "control information."

[0015] In this specification, technical features individually described in one drawing may be implemented individually or simultaneously. Hereinafter, the term "wireless power" refers to any form of energy associated with an electric field, magnetic field, electromagnetic field, etc., transmitted from a wireless power transmitter to a wireless power receiver without the use of a physical electromagnetic conductor. Wireless power, also referred to as a wireless power signal, may refer to an oscillating magnetic flux enclosed by a primary coil and a secondary coil. For example, power conversion in a system for wirelessly charging devices including mobile phones, cordless phones, iPods, MP3 players, headsets, etc. is described herein. Generally, basic principles of wireless power transmission include, for example, transmitting power via magnetic coupling, transmitting power via radio frequency (RF), transmitting power via microwave, and transmitting power via ultrasound.

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

[0017] Referring to FIG. 1, a wireless power system 10 includes a wireless power transmitting device 100 and a wireless power receiving device 200.

[0018] The wireless power transmitting apparatus 100 receives power from an external power source S to generate a magnetic field, and the wireless power receiving apparatus 200 receives power wirelessly by generating a current using the generated magnetic field.

[0019] In addition, in the wireless power system 10, the wireless power transmitter 100 and the wireless power receiver 200 can transmit and receive various information required for wireless power transmission. Herein, communication between the wireless power transmitter 100 and the wireless power receiver 200 can be performed by either in-band communication using a magnetic field used for wireless power transmission or out-band communication using a separate communication carrier. Out-band communication is also called out-of-band communication. Hereinafter, the term out-band communication will be used interchangeably. Examples of out-band communication include NFC, Bluetooth (registered trademark), and Bluetooth Low Energy (BLE).

[0020] Here, the wireless power transmission apparatus 100 can be provided as a fixed type or a mobile type. Examples of the fixed type include a type embedded in a ceiling, wall, or furniture such as a table indoors, a type implanted in an outdoor parking lot, bus stop, or subway station, or a type installed in a transportation means such as a vehicle or train. The mobile type wireless power transmission apparatus 100 can be embodied as a part of another device, such as a mobile device having a movable weight and size, or a notebook computer cover.

[0021] Furthermore, the wireless power receiving apparatus 200 should be construed as a comprehensive concept including various electronic devices equipped with a battery and various home appliances that are powered by wireless power supply instead of a power cable. Representative examples of the wireless power receiving apparatus 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 electric vehicle (EV), etc.

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

[0023] 2, the wireless power system 10 includes one or more wireless power receiving devices 200. While Fig. 1 illustrates that the wireless power transmitting device 100 and the wireless power receiving device 200 exchange power one-to-one, it is also possible for one wireless power transmitting device 100 to transmit power to multiple wireless power receiving devices 200-1, 200-2, ..., 200-M as shown in Fig. 2. In particular, when wireless power transmission is performed using a magnetic resonance method, one wireless power transmitting device 100 can simultaneously transmit power to multiple wireless power receiving devices 200-1, 200-2, ..., 200-M by applying a simultaneous transmission method or a time division transmission method.

[0024] 1 illustrates a method in which the wireless power transmitting apparatus 100 directly transmits power to the wireless power receiving apparatus 200, a separate wireless power transceiver such as a relay or repeater may be provided between the wireless power transmitting apparatus 100 and the wireless power receiving apparatus 200 to increase the wireless power transmission distance. In this case, power may be transmitted from the wireless power transmitting apparatus 100 to the wireless power transceiver, and the wireless power transceiver may transmit power again to the wireless power receiving apparatus 200.

[0025] Hereinafter, the terms "wireless power receiver," "power receiver," and "receiver" referred to in this specification refer to the wireless power receiving apparatus 200. Also, the terms "wireless power transmitter," "power transmitter," and "transmitter" referred to in this specification refer to the wireless power receiving and transmitting apparatus 100.

[0026] FIG. 3 shows various examples of electronic devices in which the wireless power transmission system can be implemented.

[0027] Figure 3 shows electronic devices classified according to the amount of power transmitted and received in a wireless power transmission system. Referring to Figure 3, a low-power (approximately 5W or less or approximately 20W or less) wireless charging method can be applied to wearable devices such as smart watches, smart glasses, head-mounted displays (HMDs), and smart rings, as well as mobile (or portable) electronic devices such as earphones, remote controls, smartphones, PDAs, and tablet PCs.

[0028] A medium-power (approximately 50W or less or approximately 200W or less) wireless charging method can be applied to small and medium-sized home appliances such as notebooks, robot vacuum cleaners, TVs, audio equipment, vacuum cleaners, and monitors. A high-power (approximately 2kW or less or approximately 22kW or less) wireless charging method can be applied to kitchen appliances such as blenders, microwave ovens, and electric rice cookers, and personal transportation devices (or electronic devices / transportation means) such as wheelchairs, electric scooters, electric bicycles, and electric cars.

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

[0030] Although the following description focuses on a mobile device to which a wireless power charging method is applied, this is merely an example, and the wireless charging method according to the present specification can be applied to the various electronic devices described above.

[0031] Standards for wireless power transmission include the wireless power consortium (WPC), the air fuel alliance (AFA), and the power matters alliance (PMA).

[0032] The WPC standard defines a baseline power profile (BPP) and an extended power profile (EPP), where BPP is for wireless power transmitters and receivers that support 5W power transmission, and EPP is for wireless power transmitters and receivers that support power transmission in the range greater than 5W and less than 30W.

[0033] Each standard covers a variety of wireless power transmitters and receivers using different power levels, and these may be classified into different power classes or categories.

[0034] For example, the WPC classifies wireless power transmitters and receivers into power classes (PC)-1, PC0, PC1, and PC2, and provides standard documents for each PC. The PC-1 standard relates to wireless power transmitters and receivers that provide guaranteed power of less than 5W. PC-1 applications include wearable devices such as smart watches.

[0035] The PC0 standard relates to wireless power transmitters and receivers that provide 5W of guaranteed power. The PC0 standard includes EPP, which provides guaranteed power up to 30W. In-band (IB) communication is the mandatory communication protocol for PC0, and out-band (OB) communication, which is used as an optional backup channel, can also be used. A wireless power receiver can identify whether it supports OB by setting the OB flag in a configuration packet. A wireless power transmitter that supports OB can enter the OB handover phase by transmitting a bit pattern for OB handover in response to the configuration packet. The response to the configuration packet is NAK, ND, or a newly defined 8-bit pattern. PC0 applications include smartphones.

[0036] The PC1 standard relates to wireless power transmitters and receivers that provide guaranteed power of 30W to 150W. OB is the required communication channel for PC1, and IB is used for initialization and link establishment to OB. A wireless power transmitter can enter the OB handover phase using a bit pattern for OB handover in response to a configuration packet. PC1 applications include laptops and power tools.

[0037] The PC2 standard relates to wireless power transmitters and receivers that provide guaranteed power between 200W and 2kW, and its applications include kitchen appliances.

[0038] In this way, PCs can be distinguished by power levels, and whether or not to support same-PC compatibility is optional or mandatory. Here, same-PC compatibility means that power can be transmitted and received between the same PCs. For example, if a wireless power transmitting apparatus that is PCx can charge a wireless power receiving apparatus having the same PCx, it can be determined that same-PC compatibility is maintained. Similarly, different-PC compatibility can also be supported. Here, different-PC compatibility means that power can be transmitted and received between different PCs. For example, if a wireless power transmitting apparatus that is PCx can charge a wireless power receiving apparatus having PCy, it can be determined that different-PC compatibility is maintained.

[0039] Supporting inter-PC compatibility is a very important issue in terms of user experience and infrastructure construction. However, maintaining inter-PC compatibility poses a number of technical challenges, including the following:

[0040] In the case of compatibility between the same PCs, for example, a laptop-charging type wireless power receiving device that can be stably charged only when power is continuously transmitted has a problem when receiving a stable supply of power from a power tool-type wireless power transmitting device that transmits power discontinuously, even though it is a wireless power transmitting device for the same PC. Also, in the case of compatibility between different PCs, for example, a wireless power transmitting device with a minimum guaranteed power of 200 W may be damaged by overvoltage when transmitting power to a wireless power receiving device with a maximum guaranteed power of 5 W. As a result, it is difficult to determine PCs as an index / standard representing / indicating compatibility.

[0041] The wireless power transmitting and receiving device can provide a highly 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 that includes the wireless power transmitting device. For such applications, the interface between the smartphone's processor and the wireless charging receiving device allows for "drop and play" bidirectional communication between the wireless power transmitting device and the receiving device.

[0042] As an example, a user may experience a smart wireless charging service at a hotel. When the user enters a hotel room and places their smartphone on the room's wireless charger, the wireless charger transmits wireless power to the smartphone, which then 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, detects the reception of wireless power, or receives information about the smart wireless charging service from the wireless charger, the smartphone enters a state in which it asks the user for consent (opt-in) to additional features. To this end, the smartphone may display a message on the screen, with or without an alarm. An example of the message may 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 step 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 perform the smart charging function together.

[0043] The smart wireless charging service may also include receiving auto-filled WiFi credentials. For example, the wireless charger sends WiFi credentials to a smartphone, and the smartphone automatically fills in the WiFi credentials received from the wireless charger by running an appropriate APP.

[0044] The smart wireless charging service may also include running a hotel application that offers hotel promotions or obtains remote check-in / check-out and contact information.

[0045] As another example, a user can experience a smart wireless charging service in a vehicle. When a user gets into a vehicle and places a smartphone on a 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, detects the reception of wireless power, or receives information about the smart wireless charging service from the wireless charger, the smartphone enters a state in which it queries the user for identity verification.

[0046] In this state, the smartphone automatically connects to the vehicle via Wi-Fi and / or Bluetooth. The smartphone can display a message on the screen, with or without an alarm. An example of a message could include text such as "Welcome to your car. Select 'Yes' to synchronize device with in-car controls: Yes | No Thanks." The smartphone receives user input selecting Yes or No Thanks and executes the next step selected by the user. If Yes is selected, the smartphone sends the corresponding information to the wireless charger. The smartphone and wireless charger can then run the in-vehicle application / display software to perform smart in-vehicle control functions together. The user can enjoy desired music and view the correct map location. The in-vehicle application / display software can include the ability to provide synchronized access for passersby.

[0047] As another example, a user can experience smart wireless charging within their home. When a user enters a room and places their smartphone on a proposed wireless charger, the wireless charger transmits wireless power to the smartphone, which then 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, detects the reception of wireless power, or receives information about the smart wireless charging service from the wireless charger, the smartphone enters a state in which it asks the user for consent (opt-in) to additional features. To do this, the smartphone can display a message on the screen with or without an alarm. An example of the message could 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, selecting Yes or No Thanks, and then performs the next step selected by the user. If Yes is selected, the smartphone transmits the corresponding information to the wireless charger. The smartphone and wireless charger can at least recognize the user's patterns and prompt the user to close doors and windows, turn off the power, or set an alarm.

[0048] Hereinafter, a new term "profile" is defined as an index / criteria representing / indicating compatibility. That is, it can be interpreted that compatibility is maintained between wireless power transceivers having the same "profile" and stable power transmission / reception is possible, while power transmission / reception is not possible between wireless power transceivers having different "profiles." A profile can be defined according to compatibility and / or application, regardless of (or independently of) the power class.

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

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

[0051] In the case of the 'Mobile' profile, the PC can be defined as PC0 and / or PC1, the communication protocol / method can be IB and OB, and the operating frequency can be defined as 87 to 205 kHz. Examples of applications include smartphones and laptops.

[0052] In the case of the 'power tool' profile, the PC can be defined as PC1, the communication protocol / method as IB, and the operating frequency as 87 to 145 kHz, and an example of an application can be a power tool.

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

[0054] For the power tool and kitchen profiles, NFC communication can be used between the wireless power transmitter and receiver. The wireless power transmitter and receiver can mutually identify themselves as NFC devices by exchanging WPC NDEF (NFC Data Exchange Profile Format).

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

[0056] Referring to FIG. 4, the wireless power transmission system 10 includes a mobile device 450 that wirelessly receives power and a base station 400 that wirelessly transmits power.

[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 and control the inductive power or resonant power. 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 primary coil(s), and a communications & control circuit 120 that communicates with the wireless power receiver 200 and controls power transfer to transfer power at an appropriate level. The system circuit 405 can perform input power provisioning, control of multiple wireless power transmitters, and other operational control of the base station 400, such as user interface control.

[0058] The primary coil can generate an electromagnetic field using AC power (or voltage or current). The primary coil can generate a magnetic field of a specific frequency by receiving AC power (or voltage or current) of a specific frequency output from the power conversion circuit 110. The magnetic field can be generated in a non-radiative or radiative manner, and the wireless power receiving device 200 receives the magnetic field and generates a current. That is, the primary coil transmits power wirelessly.

[0059] In magnetic induction, the primary and secondary coils can have any suitable form, such as copper wire wound around a highly permeable material such as ferrite or amorphous metal. The primary coil is also called the transmitting coil, primary core, primary winding, or primary loop antenna. The secondary coil is also called the receiving coil, secondary core, secondary winding, secondary loop antenna, or pickup antenna.

[0060] When using the magnetic resonance method, the primary coil and the secondary coil may be provided in the form of a primary resonant antenna and a secondary resonant antenna, respectively. The resonant antenna may have a resonant structure including a coil and a capacitor. In this case, the resonant frequency of the resonant antenna is determined by the inductance of the coil and the capacitance of the capacitor. Here, the coil may be in the form of a loop. Also, a core may be disposed inside the loop. The core may include a physical core such as a ferrite core or an air core.

[0061] Energy transmission between the primary and secondary resonant antennas can occur through magnetic field resonance. The resonance phenomenon refers to a phenomenon in which, when a near field corresponding to a resonant frequency is generated in one resonant antenna and another resonant antenna is located nearby, the two resonant antennas are coupled to each other, resulting in highly efficient energy transfer between the resonant antennas. When a magnetic field corresponding to the resonant frequency is generated between the primary and secondary resonant antennas, the primary and secondary resonant antennas resonate with each other. As a result, the magnetic field generated by the primary resonant antenna is directed toward the secondary resonant antenna with higher efficiency than when the magnetic field is generally emitted into free space. Therefore, energy can be transferred from the primary resonant antenna to the secondary resonant antenna with high efficiency. The magnetic induction method can be implemented in a manner similar to the magnetic resonance method, but the frequency of the magnetic field does not need to be the resonant frequency. Instead, the magnetic induction method requires matching between the loops constituting the primary and secondary coils, and the distance between the loops must be fairly close.

[0062] Although not shown in the drawings, the wireless power transmission apparatus 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 of Wi-Fi, Bluetooth, Bluetooth LE, ZigBee (registered trademark), NFC, etc.

[0063] The communication / control circuit 120 can transmit and receive information to and from the wireless power receiving apparatus 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 using magnetic waves centered on a specific frequency. For example, the communication / control circuit 120 can perform in-band communication by transmitting or receiving the information-containing operating frequency via the primary coil after incorporating communication information into the operating frequency of wireless power transmission. The IB communication module can incorporate or interpret information-containing magnetic waves using 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. Using IB communication, the communication / control circuit 120 can transmit and receive information over distances of several meters at a data rate of several kbps.

[0065] The OB communication module can also perform out-of-band communication via a communication antenna. For example, the communication / control circuit 120 can be provided in a short-range communication module. Examples of short-range communication modules include Wi-Fi, Bluetooth, Bluetooth LE, ZigBee, and NFC communication modules.

[0066] The communication / control circuit 120 can control the overall operation of the wireless power transmission apparatus 100. The communication / control circuit 120 can perform calculations and processes of various information and control each component of the wireless power transmission apparatus 100.

[0067] The communication / control circuit 120 can be implemented as a computer or similar device using hardware, software, or a combination thereof. In terms of hardware, the communication / control circuit 120 can be implemented in the form of an electronic circuit that processes electrical signals and performs control functions, and in terms of software, it can be implemented 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 an operating point. The controlled operating point may correspond to a combination of a frequency (or phase), a duty cycle, a duty ratio, and a voltage amplitude. The communication / control circuit 120 can control the transmission power by adjusting at least one of the frequency (or phase), the duty cycle, the duty ratio, and the voltage amplitude. Alternatively, the wireless power transmitter 100 can supply a constant power, and the wireless power receiver 200 can control the reception power by controlling the resonant frequency.

[0069] Meanwhile, in the WPC system, wireless power transmitters 100 may be classified, for example, in terms of the amount of transmitted power. At this time, a wireless power transmitter 100 supporting a maximum wireless power transmission amount of 5 W (i.e., a wireless power transmitter 100 supporting the BPP protocol) may be classified, for example, into a type A wireless power transmitter 100 and a type B wireless power transmitter 100, and a wireless power transmitter 100 supporting a maximum wireless power transmission amount of 15 W (i.e., a wireless power transmitter 100 supporting the EPP protocol) may be classified, for example, into a type MP-A wireless power transmitter 100 and a type MP-B wireless power transmitter 100.

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

[0071] The Type A and Type MP A wireless power transmission apparatus 100 may have one or more primary coils. Since the Type A and Type MP A wireless power transmission apparatus 100 activates a single primary coil at a time, a single primary cell corresponding to the activated primary coil may be used.

[0072] Type B and Type MP B wireless power transmission device 100

[0073] The Type B and Type MP B power transmitters may have a primary coil array, and may allow for free positioning. To this end, the Type B and Type MP B power transmitters may 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 through a secondary coil, and a load 455 that receives the power received by the wireless power receiver 200, stores the power, and supplies it to the device.

[0075] The wireless power receiving device 200 may include a power pickup circuit 210 and a communications & control circuit 220. The power pickup circuit 210 receives wireless power via a secondary coil and converts it into electrical energy. The power pickup circuit 210 rectifies an AC signal obtained via the secondary coil and converts it into a DC signal. The communications & control circuit 220 controls the transmission and reception of wireless power (power transmission and reception).

[0076] The secondary coil can receive wireless power transmitted from the wireless power transmitting apparatus 100. The secondary coil can receive power using a magnetic field generated in the primary coil. Here, if a specific frequency is a resonant frequency, a magnetic resonance phenomenon occurs between the primary coil and the secondary coil, allowing for more efficient power transmission.

[0077] 4, the communication / control circuit 220 may further include a communication antenna. The communication antenna may transmit and receive communication signals using a communication carrier other than magnetic field communication. For example, the communication antenna may 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 to and from the wireless power transmitting apparatus 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 using magnetic waves centered on a specific frequency. For example, the communication / control circuit 220 can perform IB communication by transmitting magnetic waves containing information through a secondary coil or receiving magnetic waves containing information through a secondary coil. Information can be included in or interpreted from magnetic waves using 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. Using this IB communication, the communication / control circuit 220 can transmit and receive information over distances of several meters at a data transmission rate of several kbps.

[0080] The OB communication module can also perform out-of-band communication via a communication antenna. For example, the communication / control circuit 220 can be provided in a near-field 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 may control the overall operation of the wireless power receiving apparatus 200. The communication / control circuit 220 may perform calculations and processes of various information and control each component of the wireless power receiving apparatus 200.

[0083] The communication / control circuit 220 can be implemented as a computer or similar device using hardware, software, or a combination thereof. In terms of hardware, the communication / control circuit 220 can be implemented in the form of an electronic circuit that processes electrical signals and performs control functions, and in terms of software, it can be implemented 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 OB communication modules or short-range communication modules, such as Bluetooth or Bluetooth LE, the communication / control circuit 120 and the communication / control circuit 220 can be implemented and operated in a communication architecture such as that shown in FIG. 5.

[0085] FIG. 5 is a diagram illustrating an example of a Bluetooth communication architecture to which an embodiment of the present specification can be applied.

[0086] Referring to Figure 5, (a) of Figure 5 shows an example of a Bluetooth BR (Basic Rate) / EDR (Enhanced Data Rate) protocol stack that supports GATT, and (b) of Figure 5 shows an example of a Bluetooth LE (Low Energy) protocol stack.

[0087] Specifically, as shown in FIG. 5(a), 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 hardware for transmitting or receiving Bluetooth packets, and the controller stack 460 is connected to the Bluetooth module to control the Bluetooth module and perform 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 radio signals, and can transmit data by hopping among 79 RF channels when using Gaussian Frequency Shift Keying (GFSK) modulation.

[0091] The BR / EDR Baseband layer 14 transmits digital signals, selects a channel sequence that hops 1400 times per second, and transmits a 625 us time slot for each channel.

[0092] The link manager layer 16 controls the overall operation (link setup, control, security) of the Bluetooth connection using the Link Manager Protocol (LMP).

[0093] The Link Manager Layer 16 can perform the following functions:

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

[0095] Detach: Aborts the connection and notifies the other device of the reason for the abort.

[0096] -Power control and role switch.

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

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

[0099] The host stack (or host module) 20 includes a Logical Link Control and Adaptation Protocol (L2CAP) 21, an Attribute Protocol 22, a Generic Attribute Profile (GATT) 23, a Generic Access Profile (GAP) 24, and a BR / EDR Profile 25.

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

[0101] The L2CAP21 can multiplex various protocols and profiles provided above Bluetooth.

[0102] Bluetooth BR / EDR L2CAP uses dynamic channels, supports protocol service multiplexer, retransmission, and streaming mode, and provides segmentation and reassembly, per-channel flow control, and error control.

[0103] The Generic Attribute Profile (GATT) 23 may operate as a protocol that describes how the attribute protocol 22 is used when configuring a service. For example, the Generic Attribute Profile 23 may operate to define how ATT attributes are grouped together as services and may operate to describe features associated with services.

[0104] Thus, the General Attribute Profile 23 and the Attribute Protocol (ATT) 22 can use features to describe the state and services of a device, how features relate to each other, and how they are used.

[0105] The attribute protocol 22 and the BR / EDR profile 25 define the service profile that uses Bluetooth BR / EDR and the application protocol for exchanging this 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 handle the timing-critical radio device interface, and a Host stack 490 operable to handle high level data.

[0107] First, the controller stack 480 can be implemented using a communications module that can include a Bluetooth radio, and a processor module that can include a processing device such as a microprocessor.

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

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

[0110] The controller stack 480 includes a physical layer (PHY) 32, a link layer (Link Layer) 34, and a host controller interface (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 a frequency hopping technique consisting of GFSK (Gaussian Frequency Shift Keying) modulation and 40 RF channels.

[0112] The link layer 34, which functions to send or receive Bluetooth packets, performs advertising and scanning functions using three advertising channels, creates connections between devices, and provides the ability to exchange data packets of up to 257 bytes through 37 data channels.

[0113] The host stack 490 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 uses L2CAP to multiplex various protocols and profiles provided above Bluetooth.

[0115] First, the Logical Link Control and Adaptation Protocol (L2CAP) 41 can provide a bidirectional channel for transmitting data in 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 transmissions.

[0117] Bluetooth LE basically uses three fixed channels (one for signaling CH, one for Security Manager, and one for Attribute protocol), and may use dynamic channels as needed.

[0118] On the other hand, BR / EDR (Basic Rate / Enhanced Data Rate) basically uses dynamic channels and supports protocol service multiplexer, retransmission, streaming mode, etc.

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

[0120] ATT (Attribute Protocol) 43 defines rules for accessing data of a remote device in a server-client structure. ATT has the following six message types: Request, Response, Command, Notification, Indication, and Confirmation.

[0121] (1) Request and Response Messages: A Request message is a message for requesting and transmitting specific information from a client device to a server device, and a Response message is a response message to a Request message and can be used to be sent from a server device to a client device.

[0122] (2) Command message: A message sent from a client device to a server device mainly to instruct a specific operation, 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 a server device to a client device to notify the server of an event or the like, and the client device does not send a confirmation message for the Notification message to the server device.

[0124] (4) Indication and Confirm Message: A message sent from a server device to a client device to notify the server of an event, etc. Unlike a Notification message, the client device sends a Confirm message to the server device in response to the Indication message.

[0125] In this specification, when a GATT profile using the attribute protocol (ATT) 43 requests long data, a value for the data length is sent so that the client can clearly understand the data length, and a characteristic value can be received from the server using a UUID.

[0126] The Generic Access Profile (GAP) 45 is a new layer implemented for Bluetooth LE technology and is used to control how role selection and multi-profile operation for communication between Bluetooth LE devices occurs.

[0127] The general access profile 45 is mainly used in device discovery, connection creation, and security procedures, defines a method for providing information to the user, and defines the following attribute types:

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

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

[0130] (3) Characteristics: Data values ​​used in the service

[0131] (4) Behavior: A machine-readable format defined by the 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 may be, for example, Battery, Time, FindMe, Proximity, Time, etc., and the specific contents of the GATT-based profiles are as follows:

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

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

[0135] (3) FindMe: Provides distance-based alarm services

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

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

[0138] The Generic Attribute Profile (GATT) 44 may be operable as a protocol that describes how the attribute protocol 43 is utilized when configuring a service. For example, the Generic Attribute Profile 44 may be operable to define how ATT attributes are grouped together as a service and may be operable to describe characteristics associated with a service.

[0139] Thus, the General Attribute Profile 44 and the Attribute Protocol (ATT) 43 can use features to describe the state and services of a device, how the features relate to each other and how they are used.

[0140] The procedure for Bluetooth Low Energy (BLE) technology will be briefly described below.

[0141] BLE procedures can be divided into a device filtering procedure, an advertising procedure, a scanning procedure, a discovering procedure, a connecting procedure, etc.

[0142] Device Filtering Procedure

[0143] The device filtering procedure is a method for reducing the number of devices that respond to requests, instructions, notifications, etc. in the controller stack.

[0144] Because not all devices need to respond to a request when it is received, the controller stack can reduce the number of requests sent, thereby reducing power consumption in the BLE controller stack.

[0145] The advertising device or scanning device can perform the device filtering procedure to restrict devices that receive advertising packets, scan requests, or connection requests.

[0146] Here, the advertising device refers to a device that transmits an advertising event, i.e., executes an advertisement, and is also referred to as an advertiser.

[0147] A scanning device refers to a device that performs scanning and 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 sending a scan request is unnecessary, the scanning device can ignore the advertisement packets sent from the advertising device.

[0150] A device filtering procedure may also be used in the connection request process. If device filtering is used in the connection request process, the connection request may be ignored, thereby eliminating the need to send a response to the connection request.

[0151] Advertising Procedure

[0152] The advertising device performs an advertising procedure to perform omnidirectional broadcasting to devices within the area.

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

[0154] In contrast, directed advertising allows only devices designated as receiving devices to scan for advertising and request additional information or connection.

[0155] The advertisement 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 over the advertising physical channel.

[0158] The advertising device may receive a scan request from a listening device that is listening to obtain additional user data from the advertising device, and the advertising device may transmit a response to the scan request to the device that transmitted 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 the advertising packet is dynamic data, whereas the scan response data is generally static data.

[0160] The advertising device can receive a connection request from the initiating device on the advertising (broadcast) physical channel. If the advertising device uses a connectable advertising event and the initiating device is not filtered by the device filtering procedure, the advertising device stops advertising and enters connected mode. The advertising device can start advertising again after entering connected mode.

[0161] Scanning Procedure

[0162] A device performing scanning, i.e., a scanning device, performs a scanning procedure to listen for omnidirectional broadcast of user data from advertising devices using advertising physical channels.

[0163] The scanning device transmits a scan request to the advertising device via an advertising physical channel to request additional data from the advertising device, and 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 connecting with other BLE devices in a BLE piconet.

[0165] If the scanning device is in an initiator mode where it can receive a broadcasted advertising event and initiate 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] If the scanning device sends a connection request to the advertising device, the scanning device ceases initiator mode scanning for additional broadcasts and proceeds to connection mode.

[0167] Discovering Procedure

[0168] A Bluetooth-enabled device (hereinafter referred to as a "Bluetooth device") performs an advertisement 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 performed asymmetrically. A Bluetooth device that tries to find other devices in its vicinity is called a discovering device, and it listens to find devices advertising scannable advertising events. A Bluetooth device that is discovered and available to other devices is called a discoverable device, and it actively broadcasts advertising events via a broadcast physical channel so that other devices can scan them.

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

[0171] Connecting Procedure

[0172] The connection procedure is asymmetrical; it requires that a particular Bluetooth device performs an advertising procedure while other Bluetooth devices perform a scanning procedure.

[0173] That is, the advertisement procedure can be objective, so that only one device should respond to the advertisement. After receiving a connectable advertisement event from the advertising device, a connection can be initiated by sending a connection request to the advertising device via the advertising (broadcast) physical channel.

[0174] Next, we will briefly explain the operating states in BLE technology, namely, the advertising state, scanning state, initiating state, and connection state.

[0175] Advertising State

[0176] The link layer (LL) enters the advertising state upon instruction from the host (stack). When the link layer is in the advertising state, it sends advertising PDUs (Packet Data Circuits) from advertising events, etc.

[0177] Each advertising event consists of at least one advertising PDU, and the advertising PDU is transmitted via the advertising channel index used. The advertising event can be terminated or terminated earlier if the advertising device needs to make space for performing other functions when the advertising PDU is transmitted via the advertising channel index used.

[0178] Scanning State

[0179] The Link Layer enters the scanning state at the direction of the host (stack). In the scanning state, the Link Layer listens for advertising channel indexes.

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

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

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

[0183] The Link Hierarchy shall listen for all complete scan intervals of the Scan Window as directed by the Host, unless there is a scheduling conflict. In each Scan Window, the Link Hierarchy shall scan for other advertising channel indexes. The Link Hierarchy shall use all available advertising channel indexes.

[0184] When passively scanning, the link layer can only receive packets and cannot send any packets.

[0185] When actively scanning, the link layer listens to the advertising device to request an advertising PDU and additional information related to the advertising device, depending on the advertising PDU type.

[0186] Initiating State

[0187] The link layer enters the starting state at the command of the host (stack).

[0188] When the link hierarchy is in the starting state, it listens for an advertising channel index.

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

[0190] (Connection state)

[0191] The link layer enters a connected state when a device making a connection request, i.e., an initiating device, sends a CONNECT_REQ PDU to an advertising device or when the advertising device receives a CONNECT_REQ PDU from the initiating device.

[0192] A connection is considered to be created after entering the Connected state, but it is not necessarily considered to be established at the time the connection enters the Connected state. The only difference between a newly created connection and a pre-established connection is the link layer connection supervision timeout value.

[0193] When both devices are connected, they 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 a connection event refers to a synchronized point between the master and the slave.

[0195] Below is a brief description of the packets defined in the Bluetooth interface. BLE devices use 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 made up of four fields: a preamble, an access address, a packet data unit (PDU), and a CRC.

[0199] When a packet is transmitted from an advertising physical channel, the PDU will be an advertising channel PDU, and when a packet is transmitted from a data physical channel, the PDU will be a data channel PDU.

[0200] Advertising Channel PDU

[0201] An 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 for specific events:

[0206] ADV_IND: Connectable omnidirectional advertising event

[0207] ADV_DIRECT_IND: Connectable directional advertising event

[0208] ADV_NONCONN_IND: Non-connectable non-directional advertising event

[0209] ADV_SCAN_IND: Scannable omnidirectional advertising event

[0210] The PDU is transmitted from the link layer in the advertising state and is 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 situations described below.

[0213] SCAN_REQ: Sent by the Link Layer in the Scanning state and received by the Link Layer in the Advertising state.

[0214] SCAN_RSP: Sent 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 Start PDUs:

[0217] CONNECT_REQ: Sent by the Link Layer in the Initiation state and received by the Link Layer in the Advertisement state.

[0218] Data Channel PDU

[0219] The data channel PDU has a 16-bit header, a variable size payload, and can include a Message Integrity Check (MIC) field.

[0220] As mentioned above, the procedures, states, packet formats, etc. in BLE technology can be applied to perform the methods proposed herein.

[0221] 4 again, the load 455 is a battery. The battery can store energy by using the power output from the power pickup circuit 210. However, the mobile device 450 does not necessarily include a battery. For example, the battery can be provided as an external detachable battery. As another example, the wireless power receiving apparatus 200 can include a driving means for driving various operations of the electronic device instead of a battery.

[0222] Although the mobile device 450 is illustrated as including a wireless power receiving device 200 and the base station 400 is illustrated as including a wireless power transmitting device 100, in a broad sense, the wireless power receiving device 200 can be considered the same as the mobile device 450, and the wireless power transmitting device 100 can be considered the same as the base station 400.

[0223] When the communication / control circuit 120 and the communication / control circuit 220 include an OB communication module or a short-range communication module such as Bluetooth or Bluetooth LE in addition to an 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 illustrating a wireless power transmission system using BLE communication according to an example.

[0225] 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] Meanwhile, the wireless power receiving 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] In one aspect, the BLE communication modules 122, 222 implement the architecture and operation according to Fig. 5. For example, the BLE communication modules 122, 222 may be used to establish a connection between the wireless power transmitting apparatus 100 and the wireless power receiving apparatus 200 and exchange control information and packets required for wireless power transmission.

[0228] In another aspect, communication / control circuit 120 may be configured to operate a profile for wireless charging, where the profile for wireless charging may be GATT using BLE transmission.

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

[0230] Referring to FIG. 7, the communication / control circuits 120 and 220 may include only in-band communication modules 121 and 221, respectively, and the BLE communication modules 122 and 222 may be provided separately from the communication / control circuits 120 and 220.

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

[0232] Meanwhile, when a user places a wireless power receiving apparatus 200 within the operating space of the wireless power transmitting apparatus 100, both the wireless power transmitting apparatus 100 and the wireless power receiving apparatus 200 start communication for the purpose of configuring and controlling power transmission. At this time, a power signal can provide a carrier for all communications, and a protocol for communication can be configured in multiple stages. The communication protocol will be described below.

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

[0234] WPC can define two communication protocols.

[0235] Baseline Protocol (or BPP): This can refer to an 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): Supports two-way communication and improved FOD (foreign object detection) functions, and can also support data transmission stream functions and authentication options.

[0237] Referring to FIG. 8, the power transfer operation between the wireless power transmitting apparatus 100 and the wireless power receiving apparatus 200 according to one embodiment of the present specification can be broadly divided into a Ping Phase 810, a Configuration Phase 820, a Negotiation Phase 830, and a power transfer phase (power transmission phase).

[0238] -Pin Phase 810

[0239] In the PIN phase 810, the wireless power transmitting apparatus 100 may attempt to establish communication with the wireless power receiving apparatus 200. Before attempting to establish communication, a measurement may be performed to check whether there are any objects, such as a bank card, coins, or other metal objects, that may be damaged or heated during power transmission. Here, such a measurement may be performed without waking up the wireless power receiving apparatus 200.

[0240] Here, after obtaining design information from the wireless power receiving device 200, the wireless power transmitting device 100 can postpone the decision on 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 receiving apparatus 200 may transmit basic identification and configuration data to the wireless power receiving apparatus 200. Then, both the wireless power transmitting apparatus 100 and the wireless power receiving apparatus 200 may use this information to create a baseline power transmission contract.

[0243] In addition, the wireless power transmitting apparatus 100 and the wireless power receiving apparatus 200 can determine whether to continue using the Baseline Protocol or the Extended Protocol in the configuration phase 820 .

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

[0245] -Negotiation Phase 830

[0246] In the negotiation phase 830, the wireless power transmitting apparatus 100 and the wireless power receiving apparatus 200 can establish an extended power transfer contract including additional settings and restrictions. The wireless power receiving apparatus 200 can also provide design information to the wireless power transmitting apparatus 100. The design information can later be used to complete FOD before switching to the power transmission phase 840.

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

[0248] -Power Transmission Phase 840

[0249] The power transmission phase 840 may be a stage in which power is transmitted to the load of the wireless power receiving apparatus 200 .

[0250] In the extended protocol, the wireless power transmitting apparatus 100 and the wireless power receiving apparatus 200 may perform system calibration when this stage begins. This stage may be interrupted occasionally to renegotiate elements of the power transfer agreement, but power transfer may continue during such renegotiation.

[0251] The protocols for the Ping Phase 810, Configuration Phase 820, Negotiation Phase 830, and Power Transfer Phase 840 will now be described in more detail.

[0252] 1. Pin Phase 810

[0253] When the ping phase 810 starts, the wireless power transmitting apparatus 100 does not yet know whether the wireless power receiving apparatus 200 is within the operating volume or not, and the wireless power transmitting apparatus 100 cannot recognize the wireless power receiving apparatus 200 because the system is generally deactivated due to lack of a power signal.

[0254] In this situation, before the wireless power transmitting apparatus 100 initiates a digital ping to request a response from the wireless power receiving apparatus 200, the wireless power transmitting apparatus 100 may undergo the following steps.

[0255] FIG. 9 shows an example of a PIN phase 810 protocol.

[0256] 9, the wireless power transmission apparatus 100 may execute an analog pin (S910). That is, the wireless power transmission apparatus 100 may transmit the analog pin to check whether an object exists within the operating volume. For example, the wireless power transmission apparatus may detect whether an object exists within the operating volume based on a change in current of a transmission coil or a primary coil.

[0257] The wireless power transmitting apparatus 100 may apply NFC tag protection (S920). Here, the NFC tag protection may be performed according to the following procedure.

[0258] a) First, it can be determined whether one or more of the sensed objects includes an NFC tag.

[0259] b) Then, if an object contains an NFC tag, it can be checked whether it can withstand the power signal without being damaged.

[0260] c) If the wireless power transmission apparatus 100 determines that the NFC tag cannot withstand the power signal, it will not start the digital PIN and will hold the PIN stage, and the wireless power transmission apparatus 100 can inform the user of the reason for not continuing.

[0261] The wireless power transmitting apparatus 100 may detect a foreign object (S930). That is, the wireless power transmitting apparatus 100 may collect information useful for determining whether or not there is a foreign object other than the wireless power receiving apparatus 200. To this end, the wireless power transmitting apparatus 100 may use various methods such as a free-power FOD method.

[0262] Meanwhile, the wireless power receiving device may not operate in the above three steps (S910, S920, S930).

[0263] If the wireless power transmitting apparatus 100 executes the above steps and determines that there is a potential wireless power receiving apparatus 200 in the operating space, the wireless power transmitting apparatus 100 may initiate a digital ping (S940). Here, the digital ping may request a response such as a signal strength (SIG) data packet or an end power transfer (EPT) data packet from the wireless power receiving apparatus 200.

[0264] Thereafter, the wireless power transmitting apparatus 100 may receive a SIG or EPT from the wireless power receiving apparatus 200 (S950). Here, the SIG data packet may provide a coupling measurement and may include information on a signal strength value. Also, the EPT data packet may provide a request to stop power transmission and the reason for the request.

[0265] If the wireless power transmitting apparatus 100 does not receive the above response from the wireless power receiving apparatus 200, the wireless power transmitting apparatus 100 may remain in the ping phase 810 and repeat the above steps.

[0266] 2. Configuration Phase 820

[0267] The configuration phase 820 is part of the protocol as follows:

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

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

[0270] The wireless power receiving apparatus 200 and the wireless power transmitting apparatus 100 can determine the protocol variant to be used 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 the digital pin parameters, which may 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 to a position within the operating space.

[0272] The protocol in the configuration phase 820 will now be described in more detail.

[0273] FIG. 10 shows an example of a configuration phase 820 protocol.

[0274] 10, the wireless power transmitting apparatus 100 may receive an ID (identification) from the wireless power receiving apparatus 200 (S1010). Alternatively, the wireless power transmitting apparatus 100 may also receive an XID (extended identification) from the wireless power receiving apparatus 200 (S1020). That is, the wireless power receiving apparatus 200 may identify itself using an ID data packet and, optionally, an XID data packet.

[0275] The wireless power transmitting apparatus 100 may selectively receive a power control hold-off (PCH) data packet from the wireless power receiving apparatus 200 (S1030), and may also receive a CFG data packet from the wireless power receiving apparatus 200 (S1040). That is, the wireless power receiving apparatus 200 may provide data for use in a power transfer contract using the PCH and / or CFG data packet.

[0276] Finally, the wireless power transmitting apparatus 100 can check the extended protocol if possible (S1050).

[0277] The above-mentioned data packets can be summarized as follows:

[0278] ID: The ID data packet may be information for identifying the wireless power receiving apparatus 200. Here, the ID may include a manufacturer code, a basic device identifier, etc. The ID may also include information for identifying the presence or absence of an XID data packet in the configuration phase.

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

[0280] PCH: The PCH data packet can configure a delay between receiving the CE data packet and the wireless power transmitting apparatus 100 starting to adjust the coil current.

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

[0282] For example, the CFG data packet may provide all parameters recommended for power transmission in the baseline protocol, all FSK communication parameters used in the extended protocol, and additional functions of the wireless power receiving device 200.

[0283] FIG. 11 illustrates a message field of a configuration packet (CFG) of a wireless power receiving apparatus according to an embodiment.

[0284] According to FIG. 11, a configuration packet (CFG) according to one 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 out-of-band (OB) flag.

[0285] The authentication flag (AI) indicates whether the wireless power receiving apparatus supports an authentication function. For example, if the authentication flag (AI) value is “1”, it indicates that the wireless power receiving apparatus supports the authentication function or can operate as an authentication initiator, and if the authentication flag (AI) value is “0”, it indicates that the wireless power receiving apparatus does not support the authentication function or cannot operate as an authentication initiator.

[0286] The outband (OB) flag indicates whether the wireless power receiving apparatus supports outband communication. For example, if the value of the outband (OB) flag is '1', the wireless power receiving apparatus indicates outband communication, and if the value of the outband (OB) flag is '0', the wireless power receiving apparatus indicates that the wireless power receiving apparatus does not support outband communication.

[0287] The provision of the ID and / or XID is for identification purposes, and the provision of the PCH and / or CFG is for building a power transfer contract.

[0288] 3. Negotiation Phase 830

[0289] The negotiation phase 830 is a part of an extended protocol that allows the wireless power transmitting apparatus 100 and the wireless power receiving apparatus 200 to change the power transmission agreement. There are two types of this phase.

[0290] Negotiation Phase 830: The negotiation phase 830 directly follows the configuration phase 820 and serves to generate an initial extended power transmission agreement. 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 limited.

[0291] Renegotiation Phase: The renegotiation phase can interrupt the power transmission phase 840 multiple times and typically serves to adjust a single element of the power transfer agreement. Also, FOD / qf, FOD / rf, and SRQ / rpr data packets may not be utilized during the renegotiation phase. Restrictions on CE data packets during the power transmission phase 840 limit the length of the renegotiation phase.

[0292] During the negotiation or renegotiation phase, a Power Transfer Contract associated with the reception / transmission of wireless power between the wireless power receiving device and the wireless power transmitting device may be extended or modified, or an update to the Power Transfer Contract may be made to adjust at least some of the elements of the Power Transfer Contract, or information may be exchanged to establish out-of-band communication.

[0293] FIG. 12 is a flow diagram that outlines a protocol for the negotiation or renegotiation phase according to one embodiment.

[0294] 12, the wireless power transmitting apparatus 100 may receive an FOD status data packet (e.g., FOD) from the wireless power receiving apparatus 200 (S1210). Here, the wireless power receiving apparatus 200 may use the FOD status data packet to inform the wireless power transmitting apparatus 100 of the effect that its presence will have on selected attributes of the reference wireless power transmitting apparatus 100. The wireless power transmitting apparatus 100 may then use this information to configure the FOD function.

[0295] The wireless power transmitting apparatus 100 may transmit an ACK / NAK for the FOD status data packet to the wireless power receiving apparatus 200 (S1215).

[0296] Meanwhile, the wireless power receiving apparatus 200 can receive an ID (Identification data packet), a CAP (Capabilities data packet), and an XCAP (extended CAP) from the wireless power transmitting apparatus 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, which may include a header value of a data packet that the wireless power receiving apparatus 200 requests from the wireless power transmitting apparatus 100 using the GRQ packet.

[0298] For example, in the negotiation phase or the renegotiation phase, the wireless power receiving apparatus 200 may transmit a GRQ packet (GRQ / id) requesting an ID packet of the wireless power transmitting apparatus 100 to the wireless power transmitting apparatus 100 (S1220).

[0299] The wireless power transmitting apparatus 100 that has received the GRQ / id can transmit an ID packet to the wireless power receiving apparatus 200 (S1225). The ID packet of the wireless power transmitting apparatus 100 includes information on the "Manufacturer Code." The ID packet including the information on the "Manufacturer Code" enables the manufacturer of the wireless power transmitting apparatus 100 to be identified.

[0300] Alternatively, in the negotiation phase or renegotiation phase, the wireless power receiving apparatus 200 may transmit a GRQ packet (GRQ / cap) requesting a performance packet (CAP) of the wireless power transmitting apparatus 100 to the wireless power transmitting apparatus 100 (S1230). The message field of the GRQ / cap may include a header value (0x31) of the performance packet (CAP).

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

[0302] Alternatively, in the negotiation phase or renegotiation phase, the wireless power receiving apparatus 200 may transmit a GRQ packet (GRQ / xcap) requesting a performance packet (CAP) of the wireless power transmitting apparatus 100 to the wireless power transmitting apparatus 100 (S1240). The message field of the GRQ / xcap may include the header value (0x32) of the performance packet (XCAP).

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

[0304] FIG. 13 illustrates a message field of a capability packet (CAP) of a wireless power transmitter according to an embodiment.

[0305] A Capability Packet (CAP) according to one embodiment may have a header value of 0x31 and may include a 3-byte message field, as shown in FIG.

[0306] Referring to FIG. 13, the message field of the Capability Packet (CAP) may include a 1-bit Authentication (AR) flag and a 1-bit Out-of-Band (OB) flag.

[0307] The authentication flag (AR) indicates whether the wireless power transmission apparatus 100 supports an authentication function. For example, if the value of the authentication flag (AR) is “1”, it indicates that the wireless power transmission apparatus 100 supports the authentication function or can operate as an authentication responder, and if the value of the authentication flag (AR) is “0”, it indicates that the wireless power transmission apparatus 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", the wireless power transmission device 100 can be instructed not to support outband communication.

[0309] In the negotiation stage, 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, in the negotiation stage or the re-negotiation stage, the wireless power receiving device 200 can update the elements of the power transfer contract regarding the power provided in the power transmission phase by using at least one specific request packet (specific request data packet, SRQ, Specific Request data packet) (S1250), and can receive an ACK / NAK therefor (S1255).

[0311] On the other hand, to confirm the extended power transfer contract and end the negotiation stage, 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 apparatus 200 can control the power level by transmitting control error (CE) data, which measures the deviation between the target and actual operating point of the wireless power receiving apparatus 200, to the wireless power transmitting apparatus 100. The wireless power transmitting apparatus 100 and the wireless power receiving apparatus 200 aim to make the control error data zero, at which 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 transmitter 100 and the wireless power receiver 200 can exchange information to facilitate FOD. The wireless power receiver 200 periodically reports the amount of power it receives (received power level) to the wireless power transmitter 100, and the wireless power transmitter 100 can inform the wireless power receiver 200 whether it has detected a foreign object. A method usable for FOD in the power transmission phase may correspond to, for example, power loss calculation. In this approach, the wireless power transmitter 100 compares the received power level reported by the wireless power receiver 200 with the amount of transmitted power (transmitted power level), and when the difference exceeds a threshold, it can transmit a signal to the wireless power receiver 200 (indicating whether it has detected a foreign object).

[0318] <Renegotiation Phase>

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

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

[0321] When it is detected that the wireless power transmitting apparatus 100 is operating at a low efficiency.

[0322] - When the wireless power transmitting device 100 can no longer maintain the current power level due to the increased operating temperature (or the opposite case, i.e., when the wireless power receiving device 200 can operate at a higher power level after being cooled down sufficiently).

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

[0324] <Data transmission stream>

[0325] The wireless power transmitting apparatus 100 and the wireless power receiving apparatus 200 can exchange application level data throughout the power transmission phase 840, initiating a data transmission stream.

[0326] An important common application here is authentication, where both sides can verify the credentials of the other in an anti-modulation manner. For example, the wireless power receiving device 200 can attempt to verify the credentials of the wireless power transmitting device 100 to ensure that the wireless power transmitting device 100 can be trusted to operate safely at high power levels. Proper credentials can mean that regulatory compliance tests have been passed.

[0327] Thus, a scheme can be provided herein that begins the transfer of power at a low power level and controls the power to a higher level only after successfully completing an authentication protocol.

[0328] <Protocol for power transmission phase 840>

[0329] The above has outlined the operations between the wireless power transmitting apparatus 100 and the wireless power receiving apparatus 200 in the power transmission phase 840. Hereinafter, to facilitate understanding of the operations in the power transmission phase 840, the protocols in the power transmission phase 840 will be described by distinguishing between the baseline protocol and the extended protocol.

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

[0331] 14, the wireless power receiving apparatus 200 can transmit a CE to the wireless power transmitting apparatus 100 (S1410). Here, the wireless power receiving apparatus 200 can transmit a normal CE data packet several times per second.

[0332] The wireless power receiving apparatus 200 may transmit a received power (RP) data packet (RP8 in the baseline protocol) to the wireless power transmitting apparatus 100, typically once every 1.5 seconds (S1420).

[0333] Alternatively, the wireless power receiving apparatus 200 may transmit a CHS (charge status) data packet to the wireless power transmitting apparatus 100 (S1430).

[0334] The above-mentioned data packets can be summarized as follows.

[0335] CE: The CE data packet may provide feedback on a desired power level. The CE data packet may include a control error value, which 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 apparatus 200. If the control error value is a positive value, it indicates that the actual operating point is below the target operating point, and the wireless power transmitting apparatus 100 may be requested to increase the power signal. If the control error value is a negative value, it indicates that the actual operating point is above the target operating point, and the wireless power transmitting apparatus 100 may be requested to decrease the power signal.

[0336] RP8: The RP8 data packet may report the received power level, where the RP8 data packet may only be included in the Baseline Protocol.

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

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

[0339] 15, the wireless power receiving apparatus 200 can transmit a CE to the wireless power transmitting apparatus 100 (S1510). Here, the wireless power receiving apparatus 200 can generally transmit a CE data packet several times per second.

[0340] The wireless power receiving apparatus 200 may transmit a received power (RP) data packet (RP in the extended protocol) to the wireless power transmitting apparatus 100, typically 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 must be repeatedly transmitted / received according to the required timing constraints for controlling the radio power.

[0342] The wireless power transmitting apparatus 100 can control the level of wireless power to be transmitted based on the control error packet (CE) and received power packet (RP) received from the wireless power receiving apparatus 200.

[0343] On the other hand, in the extended protocol, the wireless power transmitting apparatus 100 can respond to the received power packet (RP) with a bit pattern such as ACK, NAK, or ATN (S1520).

[0344] When the wireless power transmitting apparatus 100 responds with an ACK to a received power packet (RP / 0) with a mode value of 0, this means that power transmission can continue at the current level.

[0345] When the wireless power transmitting apparatus 100 responds with a NAK to a received power packet (RP / 0) with a mode value of 0, this means that the wireless power receiving apparatus 200 should reduce power consumption.

[0346] When the wireless power transmitting apparatus 100 responds with an ACK to a received power packet (RP / 1 or RP / 2) whose mode value is 1 or 2, this means that the wireless power receiving apparatus 200 has accepted the power correction value included in the received power packet (RP / 1 or RP / 2).

[0347] When the wireless power transmitting apparatus 100 responds with a NAK to a received power packet (RP / 1 or RP / 2) whose mode value is 1 or 2, it means that the wireless power receiving apparatus 200 did not accept the power correction value included in the received power packet (RP / 1 or RP / 2).

[0348] The received power packet (RP / 1) having the mode value 1 may mean a first calibration data point, and the received power packet (RP / 2) having the mode value 2 may mean an additional calibration data point. Here, the wireless power receiving device may transmit the received power packet (RP / 2) having the mode value 2 to the wireless power transmitting device several times to transmit multiple additional power correction values, and the wireless power transmitting device may perform a correction process based on the received RP / 1 and multiple RP / 2s.

[0349] The wireless power transmitting apparatus 100 responding with an ATN to a received power packet (RP) means that the wireless power transmitting apparatus 100 requests permission for communication. That is, the wireless power transmitting apparatus 100 can transmit an attention (ATN) response pattern in response to the RP data packet to request permission to transmit a data packet. In other words, the wireless power transmitting apparatus 100 can transmit an ATN to the wireless power receiving apparatus 200 in response to the RP data packet to request permission to transmit a data packet from the wireless power receiving apparatus 200.

[0350] Alternatively, the wireless power receiving apparatus 200 may transmit a CHS (charge status) data packet to the wireless power transmitting apparatus 100 (S1525).

[0351] Meanwhile, 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 of elements in the power transmission contract (generally, guaranteed load power).

[0352] For example, the wireless power receiving apparatus 200 may transmit a DSR data packet to the wireless power transmitting apparatus 100 (S1530), and the wireless power transmitting apparatus 100 may transmit a CAP to the wireless power receiving apparatus 200 (S1535).

[0353] In addition, the wireless power receiving apparatus 200 transmits a NEGO data packet to the wireless power transmitting apparatus 100 (S1540), and the wireless power transmitting apparatus 100 can transmit an ACK to the wireless power receiving apparatus 200 in response to the NEGO data packet (S1545).

[0354] Here, the data packets related to the start of the renegotiation phase are summarized as follows:

[0355] -DSR: The DSR data packet may be set to one of the following values:

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

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

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

[0359] iv) 0xFF-DSR / ack: Confirms that the last received data packet of the wireless power transmitting apparatus 100 has been correctly processed.

[0360] CAP: The CAP data packet provides information about the function of the wireless power transmitting apparatus 100. The specific contents are as described above.

[0361] NEGO: The NEGO data packet may request the wireless power transmitting apparatus 100 to perform a renegotiation phase.

[0362] The wireless power transmitting apparatus 100 and the wireless power receiving apparatus 200 can use auxiliary data transport (ADC), auxiliary data transport (ADT), and DSR data packets for exchanging application level data.

[0363] That is, in terms of transmission and reception of a data transmission stream for exchanging application level data, the wireless power receiving apparatus 200 can transmit an ADC / ADT to the wireless power transmitting apparatus 100 (S1550), and the wireless power transmitting apparatus 100 can transmit an ACK / NAK to the wireless power receiving apparatus 200 in response thereto (S1555). Also, the wireless power receiving apparatus 200 can transmit a DSR to the wireless power transmitting apparatus 100 (S1560), and the wireless power transmitting apparatus can transmit an ADC / ADT to the wireless power receiving apparatus (S1565).

[0364] Here, the data transmission stream serves to transmit application-level data from the data stream initiator to the data stream responder, and application-level data can be broadly divided into i) authentication applications and ii) proprietary (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 an authentication initiator, and the authentication response is sent by an authentication responder. The wireless power transmitting device and the receiving device can be either an authentication initiator or an authentication responder. For example, if the wireless power transmitting device is the authentication initiator, the wireless power receiving device becomes the authentication responder, and if the wireless power receiving device is the authentication initiator, the wireless power transmitting device becomes the authentication responder.

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

[0368] GET_DIGESTS: This request can be used to retrieve certificate chain digests. The wireless power receiving apparatus 200 can request as many digests as desired at one time.

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

[0370] CHALLENGE: This challenge can be used to initiate product device certification of the power transmission device.

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

[0372] DIGESTS: The wireless power transmitting apparatus 100 can send a certificate chain digest using a DIGESTS response and report slots that contain valid certificate chain digests.

[0373] CERTIFICATE: This response can be used by the wireless power transmitting apparatus 100 to transmit the requested segment of the certificate chain.

[0374] CHALLENGE_AUTH: The wireless power transmitting apparatus 100 can respond to a CHALLENGE request using CHALLENGE_AUTH.

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

[0376] An authentication message may also be called an authentication packet, authentication data, or authentication control information. Messages such as GET_DIGEST and DIGESTS may also be called GET_DIGEST packets and DIGEST packets.

[0377] Meanwhile, as described above, the wireless power receiving apparatus 200 and the wireless power transmitting apparatus 100 can transmit application level data through a data transmission stream. The application level data transmitted through the data transmission stream can be configured as a data packet sequence having the following structure.

[0378] -Initial ADC data packet that opens the stream.

[0379] i) The message types contained in the stream.

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

[0381] - A series of ADT data packets containing the actual message.

[0382] - Final ADC / end data packet that closes the stream.

[0383] Hereinafter, a data transmission stream for an example in which the above-mentioned ADC, ADT, and ADC / end data packets are used will be described with reference to the drawings.

[0384] FIG. 16 illustrates an application-level data stream between a wireless power transmitting apparatus 100 and a wireless power receiving apparatus 200 according to an example.

[0385] Referring to FIG. 16, the data stream may include auxiliary data control (ADC) data packets and / or auxiliary data transport (ADT) data packets.

[0386] The ADC data packet is used to open a data stream. The ADC data packet can indicate the type of message and the number of data bytes contained in the stream. Meanwhile, the ADT data packet is a sequence of data that actually contains the message. The ADC / end data packet is used to signal the end of the stream. For example, the maximum number of data bytes in a data transmission stream may be limited to 2047.

[0387] ACK or NAC (NACK) is used to indicate whether the ADC data packet and the ADT data packet have been received correctly. Control information required for wireless charging, such as a control error packet (CE) or DSR, may be transmitted between the transmission timings of the ADC data packet and the ADT data packet.

[0388] Using such a data stream structure, authentication-related information or other application-level information may be transmitted and received between the wireless power transmitting device and the receiving device.

[0389] An example for understanding the operation between the wireless power transmitting apparatus 100 and the wireless power receiving apparatus 200 in the power transmission phase 840 will be described below.

[0390] FIG. 17 illustrates a power control method according to one embodiment.

[0391] 17, in the power transmission phase, the wireless power transmitter 100 and the wireless power receiver 200 can control the amount of power transmitted by transmitting and receiving power in parallel. The wireless power transmitter and the wireless power receiver operate at a specific control point. The control point indicates the combination of voltage and current provided at the output of the wireless power receiver when power transmission is performed.

[0392] More specifically, the wireless power receiving device selects a desired control point (e.g., a desired output current / voltage, a temperature at a specific location of the mobile device, etc.), and then determines a currently operating actual control point. The wireless power receiving device can calculate a control error value using the desired control point and the actual control point, and transmit the control error value to the wireless power transmitting device as a control error packet.

[0393] The wireless power transmitter can then control power transfer by setting / controlling a new operating point (amplitude, frequency, and duty cycle) using the received control error packet. Thus, the control error packet is transmitted / received at regular time intervals during the power transfer phase. For example, the wireless power receiver can transmit a control error value by setting a negative value when trying to reduce the current of the wireless power transmitter and a positive value when trying to increase the current. In this way, in the induction mode, the wireless power receiver can control power transfer by transmitting a control error packet to the wireless power transmitter.

[0394] The resonant mode may operate in a different manner than the inductive mode. In the resonant mode, one wireless power transmitter must simultaneously serve multiple wireless power receivers. However, when controlling power transmission as in the inductive mode, the transmitted power is controlled through communication with one wireless power receiver, making it difficult to control power transmission to additional wireless power receivers. Therefore, in the resonant mode of this specification, the wireless power transmitters commonly transmit a basic power, and the wireless power receivers control the amount of received power by controlling their own resonant frequencies. However, even in this resonant mode operation, the method described in FIG. 17 is not completely excluded, and additional transmission power control may be performed using the method of FIG. 17.

[0395] The present specification will be explained in more detail below.

[0396] There are two types of wireless charging methods: the magnetic induction method, which uses the magnetic induction phenomenon between a primary coil and a secondary coil, and the magnetic resonance method, which transmits power by creating magnetic resonance using frequencies in the tens of kHz to several MHz band.The wireless charging standard for the magnetic resonance method is led by a council called A4WP, while the standard for the magnetic induction method is led by the Wireless Power Consortium (WPC).The WPC is designed to enable the in-band exchange of various status information and commands related to the wireless charging system.

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

[0398] 18, as mentioned 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 the range of more than 5W and less than 30W.

[0399] In addition, wireless power transfer systems are attempting to provide new power transfer profiles, including the MPP (magnetic power profile), which may support Apple's proprietary extensions based on Qi v1.3.0.

[0400] As can be seen in the drawing, the wireless power transmitter and the wireless power receiver basically support BPP, and additionally, the wireless power transmitter and the wireless power receiver can simultaneously support BPP and MPP. On the same level line, the wireless power transmitter and the wireless power receiver can simultaneously support BPP and EPP. In some cases, the wireless power transmitter and the wireless power receiver can support all of BPP, EPP, and MPP.

[0401] Below, the protocol in BPP, the protocol in EPP, and the protocol in MPP will be explained.

[0402] A. Protocols at BPP

[0403] Figure 19 shows a schematic diagram of the protocol used in BPP.

[0404] According to FIG. 19, the wireless power receiving apparatus can transmit a signal strength (SS) (in other words, SIG) to the wireless power transmitting apparatus (in the ping phase). Then, the wireless power receiving apparatus can transmit an ID packet to the wireless power transmitting apparatus (in the configuration phase), and optionally, can also transmit an XID packet. Then, the wireless power receiving apparatus can transmit a CFG packet to the wireless power transmitting apparatus (in the configuration phase). At this time, specific examples of 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, a wireless power receiving device and / or a wireless power transmitting device basically uses a protocol based on the BPP structure, and if the wireless power receiving device and / or the wireless power transmitting device wants to increase the amount of power transmitted, it will use a protocol extended by EPP.

[0407] B. Protocols in EPP

[0408] Figure 20 shows a schematic diagram of the protocol in EPP.

[0409] 20, the wireless power receiving device can transmit a signal strength (SS) (in other words, a SIG) to the wireless power transmitting device (in the ping phase). Then, the wireless power receiving device can transmit an ID packet to the wireless power transmitting device (in the configuration phase), and optionally, can also transmit an XID packet. Then, the wireless power receiving device can transmit a CFG packet to the wireless power transmitting device (in the configuration phase).

[0410] Meanwhile, unlike BPP, when EPP is performed, the 'Neg' field in the CFG packet can be set to 1. Then, the wireless power receiving apparatus can receive an ACK for the CFG from the wireless power transmitting apparatus.

[0411] That is, EPP is an extended concept of BPP, and if a wireless power receiving apparatus supporting EPP wants to perform EPP while a wireless power receiving apparatus and a wireless power transmitting apparatus are performing a protocol based on BPP, it can set the “Neg” bit of the CFG packet to 1. If the wireless power transmitting apparatus supports EPP, it responds to the CFG with an ACK, and the wireless power transmitting apparatus and the wireless power receiving apparatus can switch to EPP. If the “Neg” bit of the CFG is 1 but the wireless power transmitting apparatus is a BPP wireless power transmitting apparatus, the BPP wireless power transmitting apparatus does not respond to the CFG. In other words, if there is no response to the CFG, both can perform wireless power transmission and reception based on BPP.

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

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

[0414] Thereafter, wireless power transmission and reception based on EPP is performed between the wireless power transmitting device and / or the wireless power receiving device based on the power transfer contract negotiated in the negotiation phase. 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] C. Protocols in MPP

[0416] In MPP, a wireless power receiving device and a wireless power transmitting device start a protocol in BPP and then enter MPP. The startup behavior of MPP will be described as follows.

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

[0418] Here, the SIG / ID may have the same structure as that in BPP / EPP described above, with one difference being that the "ext" bit in the ID packet is set to 1 in MPP, since an XID packet must be sent in MPP.

[0419] The XID packet in MPP will be explained in more detail below.

[0420] FIG. 21 shows a schematic example of an XID packet in MPP.

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

[0422] Here, whether MPP is supported can be determined based on whether the value of 'XID selector' is 0xFE. That is, if the value of B_0 of XID is 0xFE, the XID may correspond to information indicating that the wireless power receiving apparatus supports MPP.

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

[0424] The "Preferred Frequency" field may indicate the MPP preferred frequency. Here, if the wireless power receiving device intends to retrieve information from the wireless power transmitting device before frequency switching (in the negotiation phase), it may set this field to 128 kHz. Otherwise, the wireless power receiving device may set this field to 360 kHz.

[0425] The 'Freq Mask' field corresponds to a field for determining whether an operating frequency of 360 kHz is supported, i.e., if the 'Freq Mask' field is set to 0, 360 kHz is supported.

[0426] In summary, the wireless power transmitting device can determine whether the wireless power receiving device supports MPP by determining whether the “Ext” bit of the ID received from the wireless power receiving device is set to 1 and whether B_0 of the XID is set to 0xFE.

[0427] The CFG packet in MPP will be described in more detail below.

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

[0429] 22, the MPP setting packet may be basically the same as the BPP / EPP setting packet, 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, there are two possible profiles: one is MPP Restricted mode (i.e., MPP Baseline profile) and the other is MPP Full mode (i.e., MPP Full profile).

[0431] The difference between the two is that in MPP restricted mode, the "restricted" field in the XID is set to 1, while in MPP full mode, the "restricted" field in the XID is set to 0.

[0432] In the MPP limited mode, the wireless power receiving device transmits a CFG at the first operating frequency (e.g., 128 kHz) but does not receive an ACK for the same, whereas in the MPP full mode, the wireless power receiving device transmits a CFG and receives an MPP ACK pattern for the same.

[0433] Also, in the MPP restricted mode, the wireless power receiving device and the wireless power transmitting device do not negotiate, but in the MPP full mode, the wireless power receiving device and the wireless power transmitting device negotiate MPP.

[0434] The MPP restricted mode and MPP full mode will be described in more detail below. Here, the MPP restricted mode may be used in conjunction with the MPP baseline profile, and the MPP full mode may be used in conjunction with the MPP full profile.

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

[0436] When the wireless power receiving device enters the MPP restricted mode, it runs the MPP baseline profile. In the MPP restricted mode, FSK communication is not performed and the operating frequency can only support 360 kHz. In addition, in the case of 128 kHz, the Qi BPP protocol runs.

[0437] FIG. 23 is a schematic illustration of an example of operation in the MPP baseline profile.

[0438] 23, the wireless power receiving apparatus operates preferentially at a first operating frequency (e.g., 128 kHz). After all operations at the first operating frequency are completed, the wireless power receiving apparatus changes the operating frequency to a second operating frequency (e.g., 360 kHz) and operates at the second operating frequency. This will be described in more detail as follows.

[0439] A wireless power receiving device that intends to operate in the MPP baseline profile transmits a SIG to a wireless power transmitting device on a first operating frequency.

[0440] The wireless power receiving device transmits an ID packet to the wireless power transmitting device on the first operating frequency, and the “Ext” bit in the ID is set to 1 because the wireless power receiving device must transmit an XID packet to the wireless power transmitting device when the wireless power receiving device intends to operate in the MPP baseline profile.

[0441] Then, the wireless power receiving apparatus transmits an XID packet to the wireless power transmitting apparatus on the first operating frequency. At this time, to indicate that the wireless power receiving apparatus supports MPP operation, B0 in the XID packet may be set to 0xFE, and 'Restricted' in the XID packet may be set to 1. Also, 'Preferred Freq.' in the XID packet may be set to, for example, the second operating frequency (e.g., 360 kHz).

[0442] After determining that the wireless power receiving device operates in the MPP limited mode, the wireless power receiving device suspends operation at the first operating frequency, i.e., suspends 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 (eg, 360 kHz).

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

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

[0446] FIG. 24 shows a schematic example of operation in the MPP full profile.

[0447] 24, the wireless power receiving apparatus operates preferentially on a first operating frequency (e.g., 128 kHz). After all operations at the first operating frequency are completed, the wireless power receiving apparatus changes the operating frequency to a second operating frequency (e.g., 360 kHz) and operates at the second operating frequency. This will be described in more detail as follows.

[0448] A wireless power receiving device that intends to operate in the MPP full profile transmits a SIG to a wireless power transmitting device on a first operating frequency.

[0449] The wireless power receiving device transmits an ID packet to the wireless power transmitting device on the first operating frequency, and when the wireless power receiving device intends to operate in the MPP full profile, the wireless power receiving device must transmit an XID packet to the wireless power transmitting device, so the “Ext” bit in the ID is set to 1.

[0450] The wireless power receiving apparatus transmits an XID packet to the wireless power transmitting apparatus on the first operating frequency. At this time, B0 in the XID packet may be set to 0xFE to indicate that the wireless power receiving apparatus supports MPP operation. Also, 'Restricted' in the XID packet may be set to 0 to indicate that the wireless power receiving apparatus intends to operate in MPP full mode. Also, 'Preferred Freq.' in the XID packet may be set to, for example, the second operating frequency (e.g., 360 kHz).

[0451] The wireless power receiving device may transmit a CFG packet to the wireless power transmitting device, and the wireless power receiving device may receive an MPP ACK as a response to the CFG packet. Here, the MPP ACK may have a bit pattern different from the ACK bit pattern used in the EPP, and at this point, the wireless power receiving device may check whether the wireless power transmitting device supports MPP.

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

[0453] After negotiation, the wireless power receiving device can transmit EPT / rep to the wireless power transmitting device (e.g., by entering the power transmission phase), which can result in the power signal being removed on the wireless power transmitting device and / or the wireless power receiving device, i.e., the wireless power receiving device suspends charging, enters MPP full mode, and resumes the ping phase.

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

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

[0456] The wireless power receiving device may enter a negotiation phase on the second operating frequency, and may further perform negotiation for the full MPP mode during the negotiation phase.

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

[0458] The BPP, EPP, and MPP protocols have been explained above. As mentioned above, there are similarities between the BPP, EPP, and MPP protocols, but there are also clear differences.

[0459] In the above situation, BPP / EPP was developed with some consideration given to the compatibility between BPP wireless power transmitters / receivers and EPP wireless power transmitters / receivers, so no major compatibility issues have arisen.

[0460] However, in the case of MPP, which is different from BPP / EPP, since it does not use all the protocols of BPP / EPP, there is a possibility that compatibility issues may arise between MPP and BPP / EPP. In particular, since wireless power transmitters and / or wireless power receivers using the MPP standard have a significant market dominance, there is a possibility that compatibility issues between BPP / EPP and MPP may be maximized.

[0461] To solve this problem, clear triggering for profiles between BPP / EPP and MPP (e.g., a configuration for identifying a BPP / EPP / MPP wireless power transmitter and / or a wireless power receiver) needs to be provided; however, currently, no configuration for identifying profiles between a BPP / EPP wireless power transmitter / wireless power receiver and an MPP wireless power transmitter / wireless power receiver is provided.

[0462] Therefore, in this specification, a specific configuration for identifying 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, this specification aims to provide a configuration in which an MPP wireless power receiving device can identify whether a wireless power transmitting device is a BPP / EPP wireless power transmitting device or an MPP wireless power transmitting device by checking only the operating frequency of the wireless power transmitting device.

[0464] The following drawings are created to explain a specific example of the present specification. The names of specific devices and names of specific signals / messages / fields shown in the drawings are provided for illustrative purposes only, and the technical features of the present specification are not limited to the specific names used in the following drawings.

[0465] FIG. 25 is a flow diagram of a method for identifying a profile of a power transmitting device according to one embodiment of the present disclosure.

[0466] 25, the wireless power receiving apparatus may transmit a first ID packet to the wireless power transmitting apparatus (S2510). Here, the frequency at which the first ID packet is transmitted may be the first operating frequency, which may be between 100 kHz and 145 kHz (for example, 128 kHz).

[0467] 25 may be, for example, a wireless power receiving apparatus that supports MPP (or is intended to operate in MPP). In this case, the wireless power receiving apparatus may be a wireless power receiving apparatus that supports MPP limited mode (or is intended to operate in MPP limited mode) as described above, or may be a wireless power receiving apparatus that supports MPP full mode (or is intended to operate in MPP full mode) as described above.

[0468] Here, as described above, if the wireless power receiving apparatus is an MPP wireless power receiving apparatus, it transmits an XID packet to the wireless power transmitting apparatus. Therefore, the wireless power receiving apparatus can set information indicating the presence or absence of an XID packet (e.g., an “Ext” bit) included in the ID packet to a value indicating the presence of an XID, and then the wireless power receiving apparatus can transmit the ID packet according to the set information to the wireless power transmitting apparatus.

[0469] The wireless power receiving apparatus may transmit a first XID packet to the wireless power transmitting apparatus (S2510). Here, the frequency at which the first XID packet is transmitted may be a 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, the wireless power receiving apparatus sets B0 of the XID packet to 0xFE, so that the XID can inform the wireless power transmitting apparatus that the wireless power receiving apparatus is an MPP wireless power receiving apparatus.

[0470] At this time, as described above, the MPP wireless power receiving apparatus first operates at the first operating frequency, and then changes the operating frequency to the second operating frequency (e.g., 360 kHz) to perform the MPP power transfer operation.

[0471] Meanwhile, regarding subsequent operations, the operating frequency differs between a wireless power transmitter that performs (supports) BPP / EPP operations and a wireless power transmitter that performs (supports) MPP operations.

[0472] For example, even in operations after the BPP / EPP operation is performed (supported), at least one transmission operation of SIG, ID, XID, CFG, etc. is performed at the first operating frequency.

[0473] However, a wireless power transmitter that performs (supports) an MPP operation initially operates at a first operating frequency and then changes the operating frequency to a second operating frequency, and then performs a transmission operation of at least one of SIG, ID, XID, CFG, etc. on the second operating frequency.

[0474] In consideration of this, after transmitting the first XID packet, the wireless power receiving apparatus may detect whether the wireless power transmitting apparatus is operating at the first operating frequency or the second operating frequency (S2530). In this case, the first operating frequency may be different from the second operating frequency. The first operating frequency may have a value between 100 kHz and 145 kHz, for example, and the second operating frequency may have a value of 360 kHz, for example.

[0475] Although the second operating frequency is 360 kHz as proposed above, the second operating frequency is not limited to this frequency. In particular, the wireless power receiving apparatus may provide information about the second operating frequency to the wireless power transmitting apparatus (or vice versa). In this case, the information about the second operating frequency may be transmitted via a packet such as the ID / XID / CFG / Prop packet described above.

[0476] Meanwhile, based on detecting that the wireless power transmitting apparatus is operating at the first operating frequency, the wireless power receiving apparatus can detect that the wireless power transmitting apparatus is a wireless power transmitting apparatus that performs operation based on a baseline power profile (BPP) or an extended power profile (EPP). After detecting, the wireless power receiving apparatus can transmit a second ID packet, etc. on the first operating frequency.

[0477] Alternatively, the wireless power receiving device may detect that the wireless power transmitting device is operating at the second operating frequency, and may transmit a second ID packet and a second XID packet on the second operating frequency.

[0478] Here, the wireless power receiving device may receive the wireless power from the wireless power transmitting device based on MPP at the second operating frequency, and the MPP operation performed by the wireless power transmitting device at the second operating frequency may be, for example, MPP operation based on MPP limited mode or MPP full mode.

[0479] The above describes the operation from the perspective of an MPP wireless power receiving device. In the following, for a clearer understanding of the specification, the operation of an MPP wireless power receiving device will be described from the perspective of a BPP wireless power transmitting device, an EPP wireless power transmitting device, and an MPP wireless power transmitting device.

[0480] 1.BPP Wireless Power Transmitter

[0481] The profile of a wireless power receiving device that can perform the operations of a BPP wireless power transmitting device is described below using a table.

[0482] [Table 2]

[0483] (1) Case 1

[0484] In the case of BPP PTx and BPP PRx, the same power profile is used between the PTx and PRx, so profile switching is not required, i.e., BPP operation is performed between the wireless power transmitting device and the wireless power receiving device.

[0485] (2) Case 2

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

[0487] (3) Case 3

[0488] This specification provides a specific protocol for the case of BPP PTx and MPP PRx because, as described above, a protocol for supporting mutual identification between BPP and EPP is provided, but currently there is no protocol for supporting mutual identification between BPP and MPP, or the protocol is insufficient, which may cause problems in wireless power transmission between a wireless power transmitting device and a wireless power receiving device.

[0489] Here, since PRx is an 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 an XID whose B0 has 0xFE to the wireless power transmitter. At this time, the 'Preferred frequency' included in the XID can be set to the second operating frequency (e.g., 360 kHz) as described above.

[0490] The MPP wireless power receiving apparatus selects whether to operate in MPP baseline (MPP limited mode) or MPP full (MPP full mode). As described above, there is a significant difference between the MPP baseline operation and the MPP full operation. Therefore, the configuration proposed in this specification will be described below separately for the MPP baseline operation and the MPP full operation.

[0491] -Case 3-1 (MPP baseline)

[0492] FIG. 26 shows a schematic diagram of a protocol when a wireless power receiving device is to operate in the MPP limited mode.

[0493] 26, in the MPP restricted mode, i.e., MPP-Baseline, the wireless power receiving apparatus transmits SIG, ID, and XID packets to the wireless power transmitting apparatus at the first operating frequency, as described above. At this time, the wireless power receiving apparatus sets “Restricted mode” in the XID packet to 1, as described above.

[0494] After transmitting the XID packet, the wireless power receiving device immediately terminates charging, which may mean that the wireless power receiving device that is about to enter the MPP limited mode does not transmit a CFG packet to the wireless power transmitting device.

[0495] Then, the PRx switches to MPP Restricted mode and switches to the MPP baseline profile (driving frequency is 360 kHz).

[0496] In this case, even if the wireless charging is terminated and the power transfer protocol is resumed, the BPP wireless power transmitter cannot change the operating frequency because the BPP wireless power transmitter can only communicate at the first operating frequency. In other words, the BPP PTx resumes the power transfer protocol at the BPP (at the first operating frequency).

[0497] On the other hand, unlike the BPP wireless power transmitter, the MPP wireless power transmitter can switch to the MPP baseline profile based on confirming that the wireless power receiving device 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 a second operating frequency (e.g., 360 kHz).

[0498] Considering this background, the following describes the proposed configuration in which a wireless power receiving device checks the operating frequency of a wireless power transmitting device and, based on this, identifies whether the wireless power transmitting device is a BPP wireless power transmitting device or an MPP wireless power transmitting device. The protocol between the wireless power receiving device and the wireless power transmitting device based on the identification result will also be described in detail.

[0499] 1) The PRx checks the driving frequency of the PTx and determines whether the PTx is MPP or BPP based on this. 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 a BPP ( / EPP) PTx.

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

[0501] 1-1) At this time, the wireless power receiving apparatus can transmit SS(SIG), ID, XID, and CFG to the wireless power transmitting apparatus. Then, the wireless power receiving apparatus can receive wireless power from the wireless power transmitting apparatus based on BPP when it cannot receive a response (e.g., ACK) to the CFG it transmitted from the wireless power transmitting apparatus.

[0502] 1-2) In the example of 1-1, the wireless power receiving apparatus transmits an XID packet to the wireless power transmitting apparatus. In this case, the reason why the MPP wireless power receiving apparatus transmits the XID packet is to inform the wireless power transmitting apparatus that it is an MPP wireless power receiving apparatus (and / or whether or not to use the MPP restricted mode).

[0503] However, by checking the driving frequency, the wireless power receiving apparatus already knows that the wireless power transmitting apparatus does not support MPP operation. In this situation, the wireless power receiving apparatus transmitting an XID packet to the wireless power transmitting apparatus may result in a waste of resources. Therefore, as shown in 1-2, the wireless power receiving apparatus does not need to transmit an XID packet to the wireless power transmitting apparatus.

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

[0505] 2) The PRx checks the driving frequency of the PTx and determines whether the PTx is MPP / BPP based on the driving frequency. That is, the wireless power receiving device determines whether the driving 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, the wireless power receiving device informs the wireless power transmitting device that it is in the MPP restricted mode, so the wireless power receiving device runs the MPP-baseline profile on the second driving frequency. To run the MPP baseline profile, the wireless power receiving device can transmit SIG, ID, XID, CFG packets, etc. to the wireless power transmitting device on the second driving frequency, and then the wireless power receiving device can receive wireless power from the wireless power transmitting device based on the MPP baseline. A specific example of a protocol based on the MPP baseline has been described above.

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

[0508] FIG. 27 shows a schematic diagram of a protocol when a wireless power receiving device is to operate in MPP full mode.

[0509] 27, when the MPP wireless power receiving apparatus intends to perform MPP full operation, it can transmit SIG, ID, XID, and CFG packets to the wireless power transmitting apparatus as described above. The XID at this time includes information (B0) indicating that the wireless power receiving apparatus intends to perform MPP operation, and "restricted" in the XID is set to 0, thereby indicating that the wireless power receiving apparatus intends to perform MPP full operation.

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

[0511] 1) At this time, if PTx is a BPP wireless power transmission apparatus as in this case, the wireless power transmission apparatus performs a BPP operation and does not respond to the CFG packet it has received.

[0512] At this point, when the PTx does not respond to the CFG, the wireless power receiving device can detect that the wireless power transmitting device is a BPP wireless power receiving device. In other words, the wireless power receiving device can determine that the wireless power transmitting device is a BPP PTx based on not receiving a response to the CFG from the wireless power transmitting device until a timeout occurs. If 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 the EPT to the wireless power transmitting device, and after the resumption, the wireless power transmitting device and the wireless power receiving device can perform operations based on the WPC Qi BPP.

[0514] Meanwhile, in addition to the configuration in which the wireless power receiving apparatus identifies the BPP wireless power transmitting apparatus by the above-mentioned CFG, the wireless power receiving apparatus intending to perform the MPP full operation can identify whether the wireless power transmitting apparatus is BPP by identifying the operating frequency of the wireless power transmitting apparatus as described above.

[0515] 2. EPP Wireless Power Transmitter Perspective

[0516] The profiles of the EPP wireless power transmitter and the wireless power receiver that can perform the operation are described below with reference to a table.

[0517] [Table 3]

[0518] (4) Case 4

[0519] In the case of an EPP PTx and a BPP PRx, since the PRx is a BPP, the wireless power receiving device informs the PTx that it is a BPP PRx using a CFG packet, so that the PTx can switch (or operate) in the BPP Profile.

[0520] (5) Case 5

[0521] In the case of EPP PTx and EPP PRx, the same power profile is used between the PTx and PRx, so profile switching is not required, i.e., EPP operation is performed between the wireless power transmitting device and the wireless power receiving device.

[0522] (6) Case 6

[0523] This specification provides a specific protocol for the case of EPP P Tx and MPP P Rx because, as described above, a protocol for supporting mutual identification between a BPP and an EPP is provided, but currently, a protocol for supporting mutual identification between an EPP and an MPP is absent or insufficient, causing problems in wireless power transmission between a wireless power transmitting device and a wireless power receiving device.

[0524] Here, since PRx is an 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 an XID whose B0 has 0xFE to the wireless power transmitter. At this time, the 'Preferred frequency' included in the XID can be set to the second operating frequency (e.g., 360 kHz) as described above.

[0525] The MPP wireless power receiving device selects whether to operate in MPP baseline (MPP limited mode) or MPP full (MPP full mode). As described above, there is a significant difference between the MPP baseline operation and the MPP full operation. Therefore, the configuration proposed in this specification will be described below separately for the MPP baseline operation and the MPP full operation.

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

[0527] Before describing Case 6-1 in detail, a wireless power transmission apparatus supporting EPP may perform a BPP operation in some cases. In this case, when the wireless power transmission apparatus supporting EPP performs a BPP operation, the operation in Case 3-1 may be applied. The details of this are as described above.

[0528] FIG. 28 shows a schematic diagram of a protocol when a wireless power receiving device is to operate in the MPP limited mode.

[0529] 28, in the MPP restricted mode, i.e., MPP-Baseline, the wireless power receiving apparatus transmits SIG, ID, and XID packets to the wireless power transmitting apparatus at the first operating frequency as described above. At this time, the wireless power receiving apparatus sets “Restricted mode” in the XID packet to 1 as described above.

[0530] After transmitting the XID packet, the wireless power receiving device immediately terminates charging, which may mean that the wireless power receiving device that is about to enter the MPP limited mode does not transmit a CFG packet to the wireless power transmitting device.

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

[0532] In this case, even if the EPP wireless power transmission device resumes the power transfer protocol after wireless charging is terminated, the operating frequency cannot be changed because the EPP wireless power transmission device can only communicate at the first operating frequency. In other words, the EPP PTx resumes the power transfer protocol at EPP (from the first operating frequency).

[0533] On the other hand, unlike the EPP 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 a second operating frequency (e.g., 360 kHz).

[0534] Considering this background, the following describes the proposed configuration in which a wireless power receiving device checks the operating frequency of a 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. The protocol between the wireless power receiving device and the wireless power transmitting device based on the identification result will also be described in detail.

[0535] 1) The PRx checks the driving frequency of the PTx and, based on this, checks whether the 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, if the operating frequency of the wireless power transmitter is not 360 kHz, the PRx can operate as an EPP / BPP PRx rather than an MPP PRx (SS-ID-XID / Optional-CFG-..., i.e., proceed according to the existing WPC standard). Here, since the wireless power receiver operates as an EPP / BPP PRx rather than an MPP PRx, it does not need to use the MPP ID / XID format. When the wireless power receiver operates as an EPP PRx, if the wireless power transmitter is an EPP wireless power transmitter, it can receive a response to the CFG, and in this case, the wireless power receiver performs an EPP operation. On the other hand, if the wireless power receiver operates as a BPP wireless power receiver, it cannot receive a response to the CFG even if the wireless power transmitter is an EPP wireless power transmitter. Therefore, the wireless power receiver automatically operates as a BPP PRx.

[0537] 1-1) At this time, the wireless power receiving device can transmit an SS(SIG), ID, XID, and CFG (at this time, the 'neg' bit can be set to 1 to indicate that negotiation should be performed) to the wireless power transmitting device. Then, the wireless power receiving device can perform negotiation with the wireless power transmitting device using EPP based on receiving a response (e.g., ACK) to the CFG sent by the wireless power receiving device from the wireless power transmitting device. Thereafter, the wireless power receiving device can receive wireless power from the wireless power transmitting device using EPP.

[0538] 1-2) In the example of 1-1, a wireless power receiving apparatus transmits an XID packet to a wireless power transmitting apparatus. In this case, the reason why the MPP wireless power receiving apparatus transmits the XID packet is to inform the wireless power transmitting apparatus that it is an MPP wireless power receiving apparatus (and / or whether or not the MPP restricted mode is used).

[0539] However, by checking the driving frequency, the wireless power receiving device already knows that the wireless power transmitting device does not support MPP operation. In this situation, the wireless power receiving device may transmit an XID packet to the wireless power transmitting device, which may result in a waste of resources. Therefore, as shown 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 apparatus can transmit an SS(SIG), an ID, and a CFG (at this time, the 'neg' bit can be set to 1 to indicate that negotiation should be performed) to the wireless power transmitting apparatus. Then, the wireless power receiving apparatus can perform negotiation with the wireless power transmitting apparatus using EPP based on receiving a response (e.g., ACK) to the CFG sent by the wireless power receiving apparatus from the wireless power transmitting apparatus. Thereafter, the wireless power receiving apparatus can receive wireless power from the wireless power transmitting apparatus based on the EPP.

[0541] 2) The PRx checks the driving frequency of the PTx and, based on this, checks whether the PTx is MPP / 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 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, the wireless power receiving device informs the wireless power transmitting device that it is in the MPP restricted mode, so the wireless power receiving device performs the MPP-baseline profile on the second driving 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 on the second driving frequency, and then the wireless power receiving device can receive wireless power from the wireless power transmitting device based on the MPP baseline. A specific example of a protocol based on the MPP baseline has been described above.

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

[0544] Before describing Case 6-2 in detail, a wireless power transmission apparatus supporting EPP may perform a BPP operation in some cases. In this case, when the wireless power transmission apparatus supporting EPP performs a BPP operation, the operation in Case 3-2 may be applied. The details of this are as described above.

[0545] FIG. 29 shows a schematic diagram of a protocol when a wireless power receiving device is to operate in MPP full mode.

[0546] 29, when the MPP wireless power receiving apparatus intends to perform MPP full operation, it can transmit SIG, ID, XID, and CFG packets to the wireless power transmitting apparatus as described above. The XID at this time includes information (B0) indicating that the wireless power receiving apparatus intends to perform MPP operation, and "restricted" in the XID is set to 0, thereby indicating that the wireless power receiving apparatus intends to perform MPP full operation.

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

[0548] 1) In this case, if PTx is an EPP wireless power transmission device, as in this case, the wireless power transmission device performs EPP operation, and can therefore perform an ACK response to the CFG packet it received. The ACK in this case corresponds to EPPACK.

[0549] At this point, when PTx transmits EPPACK, the wireless power receiving device can detect that the wireless power transmitting device is an EPP wireless power receiving device. If the wireless power transmitting device is EPPPTx (supporting not only MPP but also EPP), the wireless power receiving device and / or the wireless power transmitting device can perform WPC Qi EPP operations. That is, after EPP-based negotiation is performed in the negotiation phase, the power transmitting phase can be entered 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 the EPT to the wireless power transmitting device, and after the resumption, the wireless power transmitting device and the wireless power receiving device can perform operations based on the WPC Qi EPP.

[0551] Meanwhile, in addition to the configuration in which the wireless power receiving apparatus identifies the EPP wireless power transmitting apparatus according to the EPPACK response to the CFG, the wireless power receiving apparatus intending to perform the MPP full operation can identify whether the wireless power transmitting apparatus is EPP ( / BPP) capable by identifying the operating frequency of the wireless power transmitting apparatus, as described above.

[0552] 3. MPP Wireless Power Transmitter

[0553] The profile of a wireless power receiving device that can perform the MPP wireless power transmitting device and the MPP wireless power transmitting device is described below with reference to a table.

[0554] [Table 4]

[0555] (1) Case 7

[0556] In the case of MPP PTx and BPP PRx, the PRx does not send an XID indicating whether or not it supports MPP, and the PTx knows that the wireless power receiving device is a BPP (because the wireless power receiving device sets the 'neg' field in the CFG to 0 to indicate that the wireless power receiving device performs a BPP operation). Therefore, both the wireless power transmitting device and the wireless power receiving device can perform a BPP operation.

[0557] (2) Case 8

[0558] In the case of MPP PTx and EPPPRx, PRx does not send an XID indicating whether or not it supports MPP, but instead sets the 'Neg' bit in the CFG packet to 1 to indicate that the wireless power receiving device will perform EPP operation. Therefore, PTx knows that the wireless power receiving device is EPP. Therefore, (if the wireless power transmitting device supports only BPP / MPP), both PRx and PTx can perform BPP operation.

[0559] (3) Case 9

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

[0561] The above is a detailed description of the embodiments of the present specification. The above content can be summarized as follows.

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

[0563] In this situation, it is impossible for the PRx to confirm whether the PTx supports the BPP / EPP / MPP.

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

[0565] In the case of BPP PTx (no problem in the case of BPP / EPP PRx), MPP PRx assumes MPP PTx operation (checks B0 in the XID packet, presence of 0xFE and presence of 360kHz operation), checks whether MPP is supported, and assumes whether EPP PTx is supported. If not operating, it operates in BPP.

[0566] In the case of BPP PTx (no problem in the case of BPP / EPP PRx), MPP PRx assumes MPP PTx operation, then checks whether MPP is supported, and if not, operates in BPP.

[0567] In the case of EPP PTx (no problem in the case of BPP / EPP PRx), MPP PRx assumes MPP PTx operation, then checks whether MPP is supported, and if not, operates in EPP. EPP also operates in BPP if not supported.

[0568] In the case of EPP PTx (no problem in the case of BPP / EPP PRx), MPP PRx assumes MPP PTx operation, then checks whether MPP is supported, and if not, operates in BPP.

[0569] Hereinafter, the above-mentioned embodiments of the present specification will be described with reference to flow charts for an example in which the wireless power receiving device does not detect a change in the operating frequency and an example in which the wireless power receiving device detects a change in the operating frequency.

[0570] FIG. 30 is a flowchart illustrating an example in which the wireless power receiving device fails to detect that the operating frequency has been changed.

[0571] 30, a wireless power receiving apparatus that intends to perform an MPP operation can transmit a first ID packet to a wireless power transmitting apparatus (on a first operating frequency) (S3010). Here, the first ID packet may include information indicating the presence or absence of a first XID (extended ID) packet.

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

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

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

[0575] A specific example of this example is as described above.

[0576] FIG. 31 is a flowchart illustrating an example of a case where the wireless power receiving device detects that the operating frequency is changed.

[0577] 31, a wireless power receiving apparatus that intends to perform MPP operation can transmit a first ID packet to a wireless power transmitting apparatus (on a 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 apparatus may transmit a first XID packet to the wireless power transmitting apparatus (on a first operating frequency) (S3120), where the first XID packet may include information indicating that the first XID packet is a packet related to a magnetic power profile (MPP).

[0579] The wireless power receiving device may detect 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 apparatus can perform a wireless power transfer operation based on the MPP (S3150).

[0582] A specific example of this example is as described above.

[0583] The following further describes the embodiments of the present disclosure from various perspectives.

[0584] The following drawings are created to explain a specific example of the present specification. The names of specific devices and names of specific signals / messages / fields shown in the drawings are provided for illustrative purposes only, and the technical features of the present 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 performed by a wireless power receiving device according to an embodiment of the present specification.

[0586] 32, the wireless power receiving apparatus may transmit a first ID (identification) packet to the wireless power transmitting apparatus at a first operating frequency (S3210). Here, the first ID packet may include information indicating whether a first XID (extended ID) packet exists.

[0587] The wireless power receiving apparatus may transmit the first XID packet to the wireless power transmitting apparatus at the first operating frequency (S3220), where 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 may detect whether the wireless power transmitting device is operating at the first operating frequency or the second operating frequency (S3230).

[0589] For example, based on detecting that the wireless power transmitting apparatus is operating at the first operating frequency, the wireless power receiving apparatus may detect that the wireless power transmitting apparatus is a wireless power transmitting apparatus that performs operation based on a baseline power profile (BPP) or an extended power profile (EPP), and after the detection, the wireless power receiving apparatus may transmit a second ID packet on the first operating frequency.

[0590] Alternatively, for example, the wireless power receiving device may detect that the wireless power transmitting device is a wireless power transmitting device that operates based on the MPP based on the second operating frequency based on the detection that the wireless power transmitting device is operating at the second operating frequency. Here, the wireless power receiving device may receive the wireless power from the wireless power transmitting device based on the MPP based on the second operating frequency. After the detection, the wireless power receiving device may 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 apparatus may 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] Meanwhile, the wireless power receiving apparatus may transmit information informing the wireless power transmitting apparatus of the second operating frequency, where the information informing the wireless power transmitting apparatus 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 apparatus operates in a restricted MPP mode.

[0594] Although not separately illustrated, the present specification may provide a wireless power receiving apparatus that supports a magnetic power profile (MPP). The wireless power receiving apparatus may include a power pickup device associated with receiving wireless power from a wireless power transmitting apparatus and a communication / controller associated with communicating with the wireless power transmitting apparatus and controlling the reception of the wireless power. The wireless power receiving apparatus may be configured to transmit a first identification (ID) packet to the wireless power transmitting apparatus at a first operating frequency, the first ID packet including information indicating the presence or absence of a first extended ID (XID) packet, transmit the first XID packet to the wireless power transmitting apparatus at the first operating frequency, the first XID packet including information indicating that the first XID packet is a packet related to the MPP, and sense whether the wireless power transmitting apparatus is operating at the first operating frequency or a second operating frequency after transmitting the first XID packet.

[0595] FIG. 33 is a flowchart of a method for transmitting wireless power performed by a wireless power transmitting device according to one embodiment of the present specification.

[0596] 33, the wireless power transmitting apparatus may receive a first ID (identification) packet from the wireless power receiving apparatus at a first operating frequency (S3310). The first ID packet may include information indicating whether a first XID (extended ID) packet exists.

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

[0598] After receiving the first XID packet, the wireless power transmitting apparatus may change the operating frequency from the first operating frequency to the second operating frequency (S3330).

[0599] Although not separately illustrated, this specification may provide a wireless power transmission apparatus supporting a magnetic power profile (MPP). The wireless power transmission apparatus may include a power converter associated with transmitting wireless power to a wireless power receiving apparatus and a communicator / controller associated with communicating with the wireless power receiving apparatus and controlling the transmission of the wireless power. The wireless power transmission apparatus may receive a first identification (ID) packet from the wireless power receiving apparatus at a first operating frequency, the first ID packet including information indicating whether a first extended ID (XID) packet is present, receive the first XID packet from the wireless power receiving apparatus at the first operating frequency, the first XID packet including information indicating that the first XID packet is a packet related to a magnetic power profile (MPP), and perform an operating frequency change from the first operating frequency to a second operating frequency after receiving the first XID packet.

[0600] The effects of this specification will be explained below.

[0601] To explain the effect of the specification, the above-mentioned problems will be explained again as follows: BPP / EPP was developed with some consideration given to the compatibility between BPP wireless power transmitters / receivers and EPP wireless power transmitters / receivers, so no major compatibility issues occurred.

[0602] However, in the case of MPP, which is different from BPP / EPP, since MPP does not use all of the protocols of BPP / EPP, compatibility issues may arise between MPP and BPP / EPP. In particular, since wireless power transmitters and / or wireless power receivers using the MPP standard have a significant market dominance, compatibility issues between BPP / EPP and MPP may be maximized.

[0603] For example, in the conventional case, when a wireless power receiving device attempts to operate in MPP limited mode, the wireless power receiving device sends an XID packet at a first operating frequency (e.g., one that the wireless power transmitting device cannot identify), and then immediately removes the power signal without sending a CFG packet.

[0604] In this situation, the wireless power transmitting device (which cannot identify the XID packet related to MPP) cannot interpret the received XID packet and therefore does not know that the wireless power receiving device is performing an MPP-related operation. Furthermore, during this process, the wireless power transmitting device does not receive a CFG packet from the wireless power receiving device, and therefore resumes the ping phase at the first operating frequency (for example, based on a timeout, etc.).

[0605] On the other hand, a wireless power receiving device that intends to operate in the MPP limited mode will perform frequency conversion to the second operating frequency for the MPP limited mode, and then execute the wireless power protocol on the second operating frequency.

[0606] However, as described above, the wireless power transmitter still operates at the first operating frequency, which causes a problem that power transmission is not possible between the wireless power transmitter operating at the first operating frequency and the wireless power receiver operating at the second operating frequency.

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

[0608] That is, according to the present specification, a wireless power receiving apparatus that intends to perform an MPP operation can check the operating frequency of a wireless power transmitting apparatus without immediately executing a wireless power transmission related protocol on the second operating frequency. Thus, if the wireless power transmitting apparatus intends to perform an MPP operation, the wireless power receiving apparatus does not perform a frequency transition to the second operating frequency when the wireless power transmitting apparatus performs a BPP / EPP operation, but performs a BPP or EPP operation on the first operating frequency.

[0609] This prevents the aforementioned problem of a power transmission protocol not being able to be executed between a wireless power transmitter and a wireless power receiver due to differences in the operating frequency between the wireless power transmitter and the wireless power receiver, which may occur due to a lack of communication between the two. This provides an advantage of enabling stable power transmission between a wireless power transmitter and a wireless power receiver that use different protocols.

[0610] The effects obtained through the specific examples of the present 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 the present specification. Therefore, the specific effects of the present specification are not limited to those explicitly described in the present specification, but may include various effects that can be understood or derive from the technical features of the present specification.

[0611] The claims described herein may be combined in various ways. For example, technical features of method claims herein may be combined and embodied in an apparatus, and technical features of apparatus claims herein may be combined and embodied in a method. Furthermore, technical features of method claims herein and technical features of apparatus claims herein may be combined and embodied in an apparatus, and technical features of method claims herein and technical features of apparatus claims herein 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 signal strength (SIG) packet to a wireless power transmitting device at a first operating frequency; transmitting a first identification (ID) packet to the wireless power transmission device at the first operating frequency; the first ID packet includes first information relating to the presence or absence of a first XID (extended ID) packet; The first XID packet includes second information related to whether the wireless power receiving device operates in a restricted mode of the MPP; and transmitting the first XID packet to the wireless power transmission device at the first operating frequency; The method, 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 first operating frequency has a value of 128 kHz; The method of claim 1 , wherein the second operating frequency has a value of 360 kHz.

3. 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.

4. A wireless power receiving device that supports MPP (magnetic power profile), a power pickup associated with receiving wireless power from a wireless power transmitter; a communications / 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 signal strength (SIG) packet to a wireless power transmitting device at a first operating frequency; transmitting a first identification (ID) packet to the wireless power transmission device at the first operating frequency; the first ID packet includes first information relating to the presence or absence of a first XID (extended ID) packet; the first XID packet includes second information relating to whether the wireless power receiving device operates in a restricted mode of the MPP; transmitting the first XID packet to the wireless power transmission device at the first operating frequency; The wireless power receiving device, 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.

5. the first operating frequency has a value of 128 kHz; The wireless power receiving device according to claim 4 , wherein the second operating frequency has a value of 360 kHz.

6. The wireless power receiving device of claim 4 , 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.

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