# US 12,184,089 B2 · Method for detecting foreign material, and apparatus and system therefor

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- Number: US 12,184,089 B2
- Document ID: US12184089B2
- Status: Granted
- Kind: B2
- Application number: 18/223,967
- Filed: 2023-07-19
- Published: 2023-11-09
- Granted: 2024-12-31
- Earliest claimed: 2016-08-23
- Assignees: LG Innotek Co., Ltd.
- Applicants: LG Innotek Co., Ltd.
- Inventors: Jae Hee Park
- Web page: https://patentgrep.com/patent/US12184089B2

## CPC

- H02J 50/60: responsive to the presence of foreign objects, e.g. detection of living beings
- H02J 7/02: for charging batteries from AC mains by converters
- H02J 50/10: using inductive coupling
- H02J 50/12: of the resonant type
- H02J 50/20: using microwaves or radio frequency waves
- 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 50/80: involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
- H02J 50/90: involving detection or optimisation of position, e.g. alignment
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
- Y02T 90/14: Plug-in electric vehicles
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A power transmission method for a wireless power transmitter, the power transmission method including receiving, from a wireless power receiver, a foreign object detection (FOD) status packet including information on a reference quality factor or a reference peak frequency; determining whether a foreign object is present in a charging area of the wireless power transmitter based on the FOD status packet; and generating a foreign object detection indicator indicating whether the foreign object is present in the charging area of the wireless power transmitter based on a result of the determination and transmitting the generated foreign object detection indicator to the wireless power receiver, wherein the FOD status packet has a length of two bytes, wherein one byte of the FOD status packet includes a six-bit reservation field and a two-bit mode field, and wherein all bits of the reservation field are recorded as zero.

## Claims

### Claim 1

A power transmission method for a wireless power transmitter, the power transmission method comprising:
receiving, from a wireless power receiver, a foreign object detection (FOD) status packet including information on a reference quality factor or a reference peak frequency;
determining whether a foreign object is present in a charging area of the wireless power transmitter based on the FOD status packet;
generating a foreign object detection indicator indicating whether the foreign object is present in the charging area of the wireless power transmitter based on a result of the determination and transmitting the generated foreign object detection indicator to the wireless power receiver,
wherein the FOD status packet has a length of two bytes,
wherein one byte of the FOD status packet includes a six-bit reservation field and a two-bit mode field, and
wherein all bits of the reservation field are recorded as zero; and
performing a wireless charging procedure with a first power when the foreign object detection indicator indicates that the foreign object is not present in the charging area.

### Claim 2 (depends on 1)

The power transmission method of claim 1,
wherein the FOD status packet includes information corresponding to one of the reference quality factor and the reference peak frequency based on the two-bit mode field.

### Claim 3 (depends on 1)

The power transmission method of claim 1, further comprising:
requesting termination of the wireless charging procedure or performing the wireless charging procedure with a second power lower than the first power when the foreign object detection indicator indicates that the foreign object is present in the charging area.

### Claim 4 (depends on 1)

The power transmission method of claim 1, wherein the FOD status packet includes a first FOD status packet including information on the reference quality factor and a second FOD status packet including information on the reference peak frequency.

### Claim 5 (depends on 4)

The power transmission method of claim 4, wherein a value of the two-bit mode field of the first FOD status packet is “00”, and a value of the two-bit mode field of the second FOD status packet is “01”.

### Claim 6 (depends on 4)

The power transmission method of claim 4, wherein the foreign object detection indicator includes a first foreign object detection indicator indicating whether the foreign object is present in the charging area of the wireless power transmitter in response to the first FOD status packet and a second foreign object detection indicator indicating whether the foreign object is present in the charging area of the wireless power transmitter in response to the second FOD status packet.

### Claim 7 (depends on 6)

The power transmission method of claim 6, further comprising:
performing or terminating the wireless charging procedure based on the first foreign object detection indicator and the second foreign object detection indicator.