Apparatus and method for performing power calibration in wireless power transmission system

Patent metadata

Field	Value
Publication number	US-2026039155-A1
Application number	US-202519352635-A
Country	US
Kind code	A1
Filing date	Oct 8, 2025
Priority date	Jan 10, 2018
Publication date	Feb 5, 2026
Grant date	—

Abstract

The present invention relates to an apparatus and a method for performing power calibration in a wireless power transmission system. The present specification provides a wireless power transmission apparatus comprising: a power conversion unit configured to transmit, in a power transfer phase, wireless power generated on the basis of magnetic coupling to a wireless power receiving device; and a communication/control unit configured to perform an initial calibration for a power parameter prior to the power transfer phase, receive a first received power packet from the wireless power receiving device indicating the power received by the wireless power receiving device during the power transfer phase, and detect foreign matter by using the received power and a first power loss determined on the basis of the initial calibration. It is possible to adaptively respond to a newly changed wireless charging environment to calibrate transmission power and reception power, and it is possible to detect foreign matter more precisely by detecting a power loss on the basis of the calibrated transmission and reception power.

First claim

What is claimed is:

1 . A wireless power transmitter, comprising:
a power conversion unit configured to transmit wireless power generated based on magnetic coupling to a wireless power receiver in a power transfer phase; and a communication/control unit configured to: initiate a digital ping to solicit a response from the wireless power receiver, receive, from the wireless power receiver, a configuration packet, receive, from the wireless power receiver, a first received power packet informing a first received power value for power calibration, receive, from the wireless power receiver, a second received power packet informing a second received power value for power calibration, receive, from the wireless power receiver, a subsequent second received power packet informing a third received power value for power calibration, perform calibration for a power parameter using at least one of the first received power packet, the second received power packet, or the subsequent second received power packet, and perform a detection of a foreign object using a power loss determined using the power parameter.

2 . A method for detecting a foreign object by a wireless power transmitter, comprising:
initiating a digital ping to solicit a response from a wireless power receiver, receiving, from the wireless power receiver, a configuration packet, receiving, from the wireless power receiver, a first received power packet informing a first received power value for power calibration, receiving, from the wireless power receiver, a second received power packet informing a second received power value for power calibration, receiving, from the wireless power receiver, a subsequent second received power packet informing a third received power value for power calibration, performing calibration for a power parameter using at least one of the first received power packet, the second received power packet, or the subsequent second received power packet, and performing the detection of the foreign object using a power loss determined using the power parameter.

Assignees

• Lg Electronics Inc

Inventors

• Park Yongcheol
• Park Joonho
• Yook Gyunghwan

Classifications

• H02J50/40

  using two or more transmitting or receiving devices (H02J50/50 takes precedence) · CPC title

• H02J50/12

  of the resonant type · CPC title

• H02J50/80 Primary

  involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices · CPC title

• H02J50/60 Primary

  responsive to the presence of foreign objects, e.g. detection of living beings · CPC title

• H04B1/04

  Circuits · CPC title