EP-4742491-A2 - APPARATUS AND METHOD FOR PERFORMING POWER CONTROL IN WIRELESS POWER TRANSFER SYSTEM

EP4742491A2EP 4742491 A2EP4742491 A2EP 4742491A2EP-4742491-A2

Abstract

Provided are a device and method for performing authentication in a wireless power transfer system. Provided is an authentication method in a wireless power transfer system including receiving a first packet including indication information on whether a target device supports an authentication function from the target device; transmitting, when the target device supports an authentication function, an authentication request message to the target device; receiving an authentication response message including a certificate on wireless charging from the target device in response to the authentication request message; and confirming authentication of the target device based on the authentication response message.

Inventors

PARK, YONGCHEOL

Assignees

LG Electronics Inc.

Dates

Publication Date: 20260513
Application Date: 20190416

Claims (4)

A wireless power transmitter (100) comprising: a power conversion unit configured to transfer wireless power to a wireless power receiver (200); and a communication/control unit configured to control transmission of the wireless power, wherein the communication/control unit is configured to: initiate a digital ping to solicit a response from the wireless power receiver (200) in a ping phase; and receive, from the wireless power receiver (200), a configuration packet in a configuration phase, characterized in that , in a power transfer phase, the communication/control unit is configured to: receive, from the wireless power receiver (200), a received power packet, RPP, which indicates a value of the wireless power received by the wireless power receiver (200); transmit, to the wireless power receiver (200), a bit pattern which requests communication in response to the RPP; receive, from the wireless power receiver (200), a packet for polling in response to the bit pattern; and transmit, to the wireless power receiver (200), a data stream based on the packet for polling, wherein the data stream includes a specific data control packet which identifies a start of the data stream, wherein the data stream includes a plurality of auxiliary data transports, ADTs, after the specific data control packet, wherein the wireless power transmitter (100) transmits a first ADT data packet among the plurality of ADT packets to the wireless power receiver (200), wherein the wireless power transmitter (100) receives a response packet for the first ADT data packet from the wireless power receiver (200), wherein, based on the response packet being a packet representing an acknowledge, ACK, the wireless power transmitter (100) transmits a second ADT data packet among the plurality of ADT packets to the wireless power receiver (200), based on the response packet being a packet not representing the ACK, the wireless power transmitter (100) transmits the first ADT data packet to the wireless power receiver (200), again, and wherein an ADT header is toggled from a type A header to a type B header or from a type B header to a type A header for a synchronization of the data stream and the toggled ADT header is transmitted with the second ADT data packet.
A method for transferring wireless power, the method performed by a wireless power transmitter (100) and comprising: initiating a digital ping to solicit a response from a wireless power receiver (200) in a ping phase; and receiving, from the wireless power receiver (200), a configuration packet in a configuration phase, characterized in that , in a power transfer phase, the method further comprises: receiving, from the wireless power receiver (200), a received power packet, RPP, which indicates a value of the wireless power received by the wireless power receiver (200); transmitting, to the wireless power receiver (200), a bit pattern which requests communication in response to the RPP; receiving, from the wireless power receiver (200), a packet for polling in response to the bit pattern; and transmitting, to the wireless power receiver (200), a data stream based on the packet for polling, wherein the data stream includes a specific data control packet which identifies a start of the data stream, wherein the data stream includes a plurality of auxiliary data transports, ADTs, after the specific data control packet, wherein the wireless power transmitter (100) transmits a first ADT data packet among the plurality of ADT packets to the wireless power receiver (200), wherein the wireless power transmitter (100) receives a response packet for the first ADT data packet from the wireless power receiver (200), wherein, based on the response packet being a packet representing an acknowledge, ACK, the wireless power transmitter (100) transmits a second ADT data packet among the plurality of ADT packets to the wireless power receiver (200), based on the response packet being a packet not representing the ACK, the wireless power transmitter (100) transmits the first ADT data packet to the wireless power receiver (200), again, and wherein an ADT header is toggled from a type A header to a type B header or from a type B header to a type A header for a synchronization of the data stream and the toggled ADT header is transmitted with the second ADT data packet.
A wireless power receiver (200) comprising: a power pickup unit configured to receive wireless power from a wireless power transmitter (100); and a communication/control unit configured to control reception of the wireless power, wherein the communication/control unit is configured to: receive, from the wireless power transmitter (100), a digital ping in a ping phase; and transmit, to the wireless power transmitter (100), a configuration packet in a configuration phase, characterized in that , in a power transfer phase, the communication/control unit is configured to: transmit, to the wireless power transmitter (100), a received power packet, RPP, which indicates a value of the wireless power received by the wireless power receiver (200); receive, from the wireless power transmitter (100), a bit pattern which requests communication in response to the RPP; transmit, to the wireless power transmitter (100), a packet for polling in response to the bit pattern; and receive, from the wireless power transmitter (100), a data stream based on the packet for polling, wherein the data stream includes a specific data control packet which identifies a start of the data stream, wherein the data stream includes a plurality of auxiliary data transports, ADTs, after the specific data control packet, wherein the wireless power receiver (200) receives a first ADT data packet among the plurality of ADT packets from the wireless power transmitter (100), wherein the wireless power receiver (200) transmits a response packet for the first ADT data packet to the wireless power transmitter (100), wherein, based on the response packet being a packet representing an acknowledge, ACK, the wireless power receiver (200) receives a second ADT data packet among the plurality of ADT packets from the wireless power transmitter (100), based on the response packet being a packet not representing the ACK, the wireless power receiver (200) receives the first ADT data packet from the wireless power transmitter (100), again, and wherein an ADT header is toggled from a type A header to a type B header or from a type B header to a type A header for a synchronization of the data stream and the toggled ADT header is received with the second ADT data packet.
A method for receiving wireless power, the method performed by a wireless power receiver (200) and comprising: receiving, from a wireless power transmitter (100), a digital ping in a ping phase; and transmitting, to the wireless power transmitter (100), a configuration packet in a configuration phase, characterized in that , in a power transfer phase, the method further comprises: transmitting, to the wireless power transmitter (100), a received power packet, RPP, which indicates a value of the wireless power received by the wireless power receiver (200); receiving, from the wireless power transmitter (100), a bit pattern which requests communication in response to the RPP; transmitting, to the wireless power transmitter (100), a packet for polling in response to the bit pattern; and receiving, from the wireless power transmitter (100), a data stream based on the packet for polling, wherein the data stream includes a specific data control packet which identifies a start of the data stream, wherein the data stream includes a plurality of auxiliary data transports, ADTs, after the specific data control packet, wherein the wireless power receiver (200) receives a first ADT data packet among the plurality of ADT packets from the wireless power transmitter (100), wherein the wireless power receiver (200) transmits a response packet for the first ADT data packet to the wireless power transmitter (100), wherein, based on the response packet being a packet representing an acknowledge, ACK, the wireless power receiver (200) receives a second ADT data packet among the plurality of ADT packets from the wireless power transmitter (100), based on the response packet being a packet not representing the ACK, the wireless power receiver (200) receives the first ADT data packet from the wireless power transmitter (100), again, and wherein an ADT header is toggled from a type A header to a type B header or from a type B header to a type A header for a synchronization of the data stream and the toggled ADT header is received with the second ADT data packet.

Description

BACKGROUND OF THE INVENTION Field of the invention The present invention relates to wireless power transfer, and more particularly, to an apparatus and method for performing power control in a wireless power transfer system. Related Art The wireless power transfer (or transmission) technology corresponds to a technology that can wirelessly transfer (or transmit) power between a power source and an electronic device. For example, by allowing the battery of a wireless device, such as a smartphone or a tablet PC, and so on, to be recharged by simply loading the wireless device on a wireless charging pad, the wireless power transfer technique may provide more outstanding mobility, convenience, and safety as compared to the conventional wired charging environment, which uses a wired charging connector. Apart from the wireless charging of wireless devices, the wireless power transfer technique is raising attention as a replacement for the conventional wired power transfer environment in diverse fields, such as electric vehicles, Bluetooth earphones, 3D glasses, diverse wearable devices, household (or home) electric appliances, furniture, underground facilities, buildings, medical equipment, robots, leisure, and so on. The wireless power transfer (or transmission) method is also referred to as a contactless power transfer method, or a no point of contact power transfer method, or a wireless charging method. A wireless power transmission system may be configured of a wireless power transmitter supplying electric energy by using a wireless power transfer method, and a wireless power receiver receiving the electric energy being supplied by the wireless power transmitter and supplying the receiving electric energy to a receiver, such as a battery cell, and so on. The wireless power transfer technique includes diverse methods, such as a method of transferring power by using magnetic coupling, a method of transferring power by using radio frequency (RF), a method of transferring power by using microwaves, and a method of transferring power by using ultrasound (or ultrasonic waves). The method that is based on magnetic coupling is categorized as a magnetic induction method and a magnetic resonance method. The magnetic induction method corresponds to a method transmitting power by using electric currents that are induced to the coil of the receiver by a magnetic field, which is generated from a coil battery cell of the transmitter, in accordance with an electromagnetic coupling between a transmitting coil and a receiving coil. The magnetic resonance method is similar to the magnetic induction method in that is uses a magnetic field. However, the magnetic resonance method is different from the magnetic induction method in that energy is transmitted due to a concentration of magnetic fields on both a transmitting end and a receiving end, which is caused by the generated resonance. Wireless power systems implemented to follow specific standard technology may solve a safety problem when being overheated due to foreign objects. However, non-authenticated products that do not receive product authentication on technical standards or specifications have been distributed in the market, whereby users may be exposed at risk. Therefore, in a process before and after wireless charging, by enabling a wireless power transmitting device and a wireless power receiving device to perform mutual authentication on genuine products, it is necessary to secure stability and reliability. SUMMARY OF THE INVENTION The present invention provides a device and method for performing authentication in a wireless power transfer system. The invention is defined by the independent claims. Features of exemplary embodiments are defined in the dependent claims. In an aspect, there is provided a wireless power transmitter. The wireless power transmitter includes a power conversion unit configured to transfer wireless power to a wireless power receiver by forming magnetic coupling with the wireless power receiver, and a communication/control unit configured to communicate with the wireless power receiver to control transmission of the wireless power and to perform transmission or reception of data. In an aspect, the communication/control unit is configured to: receive, from the wireless power receiver, a received power packet (RPP) which indicates a value of the wireless power received by the wireless power receiver; transmit, to the wireless power receiver, a bit pattern which requests communication initiated by the wireless power transmitter in response to the RPP when the communication/control unit has data to be sent to the wireless power receiver; and receive a packet for polling the data to be sent from the wireless power receiver in response to the bit pattern. In another aspect, the data to be sent comprises power related information for increasing or decreasing a level of the wireless power. In another aspect, the RPP indicates that the wireless power