Apparatus and method enabling out-band communication in wireless charging apparatus, method and system

Patent metadata

Field	Value
Publication number	US-12512704-B2
Application number	US-202017794872-A
Country	US
Kind code	B2
Filing date	Jan 29, 2020
Priority date	Jan 29, 2020
Publication date	Dec 30, 2025
Grant date	Dec 30, 2025

Abstract

The present specification relates to an apparatus and method enabling different types of communication between a wireless power transmission apparatus and a wireless power reception apparatus. The present specification provides a wireless power transmission apparatus, a wireless power transmission method, a wireless power reception apparatus, a wireless power reception method, and a wireless charging system capable of quickly providing a user with information according to a change in a charging status.

First claim

What is claimed is:

1 . A wireless power transmitter comprising:
a power conversion unit configured to transmit a wireless power to a wireless power receiver by magnetic coupling with the wireless power receiver at an operating frequency; and a communication/control unit configured to communicate with the wireless power receiver using at least one of in-band communication using the operating frequency and out-band communication using a frequency other than the operating frequency, wherein the wireless power transmitter is configured to: exchange, with the wireless power receiver through the in-band communication, a reference quality factor, a quality factor threshold, a reference peak frequency and peak frequency threshold; establish the out-band communication with the wireless power receiver; detect that the wireless power receiver moved based on a received signal strength indicator (RSSI) of the out-band communication; based on detecting that the wireless power receiver moved, determine whether a difference between the reference quality factor and a measured quality factor exceeds the quality factor threshold; based on the difference being equal to or less than the quality factor threshold, determine whether a difference between the reference peak frequency and a measured peak frequency exceeds the peak frequency threshold; based on the difference exceeding the peak frequency threshold, stop transmitting the wireless power; and transmit, through the out-band communication, information for that the wireless power receiver is misaligned.

2 . The wireless power transmitter of claim 1 , wherein the wireless power transmitter is configured to transmit the information through the out-band communication in a state of which the in-band communication with the wireless power receiver is impossible.

3 . The wireless power transmitter of claim 1 , wherein the information includes information for a change in a charging environment that occurs after a transfer of the wireless power to the wireless power receiver is started.

4 . The wireless power transmitter of claim 1 , wherein the wireless power transmitter is configured to communicate with a device other than the wireless power receiver through the out-band communication, and transmits the information to the device through the out-band communication.

5 . The wireless power transmitter of claim 1 , wherein the wireless power transmitter is configured to confirm distance information between the wireless power transmitter and the wireless power receiver using the out-band communication.

Assignees

• Lg Electronics Inc

Inventors

• Lee Minsoo
• Choi Jingu
• Lim Jinkwon
• Kim Jaehyu

Classifications

• H02J50/60

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

• H02J50/10 Primary

  using inductive coupling · CPC title

• H02J50/90

  involving detection or optimisation of position, e.g. alignment · CPC title

• G01R22/06

  by electronic methods · CPC title

• G01R23/005

  Circuits for comparing several input signals and for indicating the result of this comparison, e.g. equal, different, greater, smaller (comparing phase or frequency of 2 mutually independent oscillations in demodulators) · CPC title