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EP-4742499-A2 - WIRELESS POWER RECEPTION APPARATUS, WIRELESS POWER TRANSMISSION APPARATUS, AND POWER CALIBRATION METHOD USING SAME

EP4742499A2EP 4742499 A2EP4742499 A2EP 4742499A2EP-4742499-A2

Abstract

A wireless power transmission apparatus according to an embodiment of the present specification corresponds to a wireless power transmission apparatus for wireless power transmission to a wireless power reception apparatus. After a negotiation phase, the wireless power transmission apparatus: receives, from the wireless power reception apparatus, a first reception power packet including an estimated received power value indicating a first calibration data point; transmits ACK with respect to the first reception power packet; receives, from the wireless power reception apparatus, a second reception power packet including an estimated received power value indicating a second calibration data point; transmits ACK with respect to the second reception power packet; receives, from the wireless power reception apparatus, a new second reception power packet including an estimated received power value indicating a third calibration data point; transmits ACK with respect to the new second reception power packet; and configures a power calibration curve by using the first reception power packet, the second reception power packet, and the new second reception power packet.

Inventors

  • PARK, YONGCHEOL

Assignees

  • LG Electronics Inc.

Dates

Publication Date
20260513
Application Date
20201005

Claims (6)

  1. A wireless power transmitter (100) for transferring wireless power to a wireless power receiver (200), the wireless power transmitter (100) configured to: transmit a digital ping to the wireless power receiver (200); receive (S1302) a first received power packet including an estimated received power value for a first calibration data point from the wireless power receiver (200) related to a first operating mode after a negotiation phase; transmit (S1303) ACK in response to the first received power packet; receive (S1305) a second received power packet including an estimated received power value for a second calibration data point from the wireless power receiver (200) related to the first operating mode; transmit (S1306) ACK in response to the second received power packet; construct a first power calibration curve based on the first received power packet and the second received power packet; perform (S1307) a foreign object detection based on the first power calibration curve and transfer power (S1308) in the first operating mode if no foreign object is present; characterized in that the wireless power transmitter is further configured to: receive (S1311) a new first received power packet including an estimated received power value for a new first calibration data point from the wireless power receiver (200) related to a second operating mode; transmit (S1312) ACK in response to the new first received power packet; receive (S1314) a new second received power packet including an estimated received power value for a new second calibration data point from the wireless power receiver (200) related to the second operating mode; transmit (S1315) ACK in response to the new second received power packet; construct a second power calibration curve based on the new first received power packet, and the new second received power packet; and perform a foreign object detection based on the second power calibration curve, wherein an operating mode is changed from the first operating mode to the second operating mode, and wherein the ACK in response to the first received power packet, the second received power packet, the new first received power packet, or the new second received power packet is transmitted when a power level is stabilized based on a control error packet including a control error value related to a deviation between an actual operating point and a target operating point of the wireless power receiver (200) received from the wireless power receiver (200).
  2. The wireless power transmitter (100) of claim 1, wherein, based on the operating mode being changed, an operating voltage is switched from a first voltage to a second voltage.
  3. The wireless power transmitter (100) of claim 1, wherein the first received power packet, the second received power packet, the new first received power packet, and the new second received power packet have the same packet structure including a mode field, and wherein the mode field of the first received power packet or the new first received power packet has a value different from a mode field of the second received power packet or the new second received power packet.
  4. A wireless power receiver (200) for receiving wireless power from a wireless power transmitter (100), the wireless power receiver (200) configured to: receive a digital ping from the wireless power transmitter (100); transmit (S1302) a first received power packet including an estimated received power value for a first calibration data point to the wireless power transmitter (100) related to a first operating mode after a negotiation phase; receive (S1303) ACK in response to the first received power packet from the wireless power transmitter (100); transmit (S1305) a second received power packet including an estimated received power value for a second calibration data point to the wireless power transmitter (100) related to the first operating mode; receive (S1306) ACK in response to the second received power packet from the wireless power transmitter (100); receive power (S1308) in the first operating mode if no foreign object is present; characterized in that the wireless power receiver is further configured to: transmit (S1311) a new first received power packet including an estimated received power value for a new first calibration data point from the wireless power receiver (200) related to a second operating mode; receive (S1312) ACK in response to the new first received power packet; transmit (S 1314) a new second received power packet including an estimated received power value for a new second calibration data point to the wireless power transmitter (100) related to the second operating mode; and receive (S1315) ACK in response to the new second received power packet from the wireless power transmitter (100), wherein an operating mode is changed from the first operating mode to the second operating mode, and wherein the ACK in response to the first received power packet, the second received power packet, the new first received power packet, or the new second received power packet is received when a power level is stabilized based on a control error packet including a control error value transmitted by the wireless power receiver (200).
  5. The wireless power receiver (200) of claim 4, wherein, based on the operating mode being changed, an operating voltage is switched from a first voltage to a second voltage.
  6. The wireless power receiver (200) of claim 4, wherein the first received power packet, the second received power packet, the new first received power packet, and the new second received power packet have the same packet structure including a mode field, and wherein the mode field of the first received power packet and the new first received power packet have a value different from those of the mode fields of the second received power packet and the new second received power packet.

Description

BACKGROUND OF THE DISCLOSURE Field of the disclosure The present disclosure relates to a wireless power transmitting device, a wireless power receiving device receiving wireless power from the wireless power transmitting device, and a method for calibrating power. Related Art The wireless power transfer (or transmission) technology corresponds to a technology that may 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 transfer 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. SUMMARY A technical object of the present disclosure is to provide a wireless power transmitting device capable of detecting a foreign object more accurately between the wireless power transmitting device and a wireless power receiving device, the wireless power receiving device, and a method for calibrating power using the devices. Technical objects to be achieved by the present disclosure are not limited to the aforementioned technical objects, and other technical objects not described above may be evidently understood by a person having ordinary skill in the art to which the present disclosure pertains from the following description. To solve the problem above, a wireless power transmitting device according to one embodiment of the present disclosure is a wireless power transmitting device transmitting wireless power to a wireless power receiving device; and receives a first received power packet including an estimated received power value fora first calibration data point from the wireless power receiving device after a negotiation phase, transmits ACK in response to the first received power packet, receives a second received power packet including an estimated received power value fora second calibration data point from the wireless power receiving device, transmits ACK in response to the second received power packet, receives a new second received power packet including an estimated received power value fora third calibration data point from the wireless power receiving device, transmits ACK in response to the new second received power packet, and constructs a power calibration curve based on the first received power packet, the second received power packet, and the new second received power packet. To solve the problem above, a wireless power receiving device according to one embodiment of the present disclosure is a wireless power receiving device receiving wireless power from a wireless power transmitting device; and transmits a first received power packet including an estimated received power value for