# US 12,603,529 B2 · Apparatus and method for performing wireless power transmission on basis of foreign material detection

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- Number: US 12,603,529 B2
- Document ID: US12603529B2
- Status: Granted
- Kind: B2
- Application number: 18/910,940
- Filed: 2024-10-09
- Published: 2025-01-30
- Granted: 2026-04-14
- Earliest claimed: 2018-08-01
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Yongcheol Park; Kyunghwan Kim
- Web page: https://patentgrep.com/patent/US12603529B2

## CPC

- H02J 50/60: responsive to the presence of foreign objects, e.g. detection of living beings
- H02J 7/42: with electronic devices having internal batteries, e.g. mobile phones
- H02J 50/10: using inductive coupling
- H02J 50/80: involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
- H02J 50/40: using two or more transmitting or receiving devices (H02J50/50 takes precedence)
- H02J 50/402: {the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas}
- H02J 2105/44: Portable electronic devices
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY

## Abstract

The present specification provides a wireless power reception apparatus comprising: a power pick-up unit configured to receive wireless power from a wireless power transmission apparatus by magnetic coupling with the wireless power transmission apparatus and convert an AC signal generated by the wireless power into a DC signal; a communication/control unit configured to receive the DC signal from the power pick-up unit and control the wireless power; and a load configured to receive the DC signal from the power pick-up unit. When foreign material is detected before power transmission, wireless power transmission is sustained on the basis of a safe basic power profile of 5 W or less, without interrupting power transmission, and thus, a charging delay can be prevented and the accuracy and reliability of detection of foreign material can be increased despite individual characteristics of the wireless power reception apparatus.

## Claims

### Claim 1

A method in a wireless power transmitting system, the method performed by a wireless power receiver and comprising:
receiving a digital ping from a wireless power transmitter;
transmitting a signal strength packet in response to the digital ping to the wireless power transmitter;
transmitting, to the wireless power transmitter, a foreign object detection (FOD) status packet,
wherein the FOD status packet includes a type field having a length of 2 bits,
wherein the FOD status packet includes a quality factor value based on the type field having a first value, and the quality factor value is equal to or greater than 25,
wherein the FOD status packet includes a resonance frequency value based on the type field having a second value; and
receiving, from the wireless power transmitter, ACK/NAK response information as a response to the FOD status packet,
wherein, based on the ACK/NAK response information informing NAK, the wireless power receiver switches to a power transfer phase of a baseline protocol.

### Claim 2 (depends on 1)

The method of claim 1, wherein the FOD status packet is transmitted during a negotiation phase.

### Claim 3 (depends on 1)

The method of claim 1, wherein the ACK/NACK response information is received during a negotiation phase.

### Claim 4 (depends on 1)

The method of claim 1, wherein wireless power received by the wireless power receiver from the wireless power transmitter is limited to 5 W or less in the baseline protocol.

### Claim 5

A wireless power receiver comprising:
a power pickup configured to receive wireless power from a wireless power transmitter; and
a communicator/controller configured to communicate with the wireless power transmitter and control reception of the wireless power,
wherein the wireless power receiver is configured to:
receive a digital ping from the wireless power transmitter;
transmit a signal strength packet in response to the digital ping to the wireless power transmitter;
transmit, to the wireless power transmitter, a foreign object detection (FOD) status packet,
wherein the FOD status packet includes a type field having a length of 2 bits,
wherein the FOD status packet includes a quality factor value based on the type field having a first value, and the quality factor value is equal to or greater than 25,
wherein the FOD status packet includes a resonance frequency value based on the type field having a second value; and
receive, from the wireless power transmitter, ACK/NAK response information as a response to the FOD status packet,
wherein, based on the ACK/NAK response information informing NAK, the wireless power receiver switches to a power transfer phase of a baseline protocol.