# US 12,119,671 B2 · Method and apparatus for controlling wireless power transmission > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,119,671 B2 - Document ID: US12119671B2 - Status: Granted - Kind: B2 - Application number: 18/355,897 - Filed: 2023-07-20 - Published: 2023-11-09 - Granted: 2024-10-15 - Earliest claimed: 2018-05-16 - Assignees: LG Innotek Co., Ltd. - Applicants: LG Innotek Co., Ltd. - Inventors: Yu Ri Park; Yong Il Kwon - Web page: https://patentgrep.com/patent/US12119671B2 ## 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 50/12: of the resonant type - H02J 50/20: using microwaves or radio frequency waves - 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 - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H02J 7/44: between battery management systems and power sources - 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} - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A method of transmitting power of a wireless power transmitter, including a receiving phase of receiving a signal including an FOD status packet from a wireless power receiver; a first determination phase of determining whether a foreign object is present in a charging area of the wireless power transmitter based on the FOD status packet; a power control phase of controlling power transmission in a first power transfer mode upon determining that the foreign object is present in the charging area in the first determination phase, or controlling power transmission in a second power transfer mode upon determining that the foreign object is not present in the charging area in the first determination phase; and a second determination phase of determining whether the foreign object is present in the charging area based on information other than information included in the FOD status packet, while controlling power transmission in one of the first power transfer mode and the second power transfer mode by the power control phase. ## Claims ### Claim 1 A method of transmitting power of a wireless power transmitter, comprising: a receiving phase of receiving a signal including an FOD status packet from a wireless power receiver; a first determination phase of determining whether a foreign object is present in a charging area of the wireless power transmitter based on the FOD status packet; a power control phase of controlling power transmission in a first power transfer mode upon determining that the foreign object is present in the charging area in the first determination phase, or controlling power transmission in a second power transfer mode upon determining that the foreign object is not present in the charging area in the first determination phase; and a second determination phase of determining whether the foreign object is present in the charging area based on information other than information included in the FOD status packet, while controlling power transmission in one of the first power transfer mode and the second power transfer mode by the power control phase, wherein the FOD status packet includes a first FOD status packet and a second FOD status packet; wherein the first FOD status packet includes one of a reference quality factor or a reference peak frequency; and wherein the second FOD status packet includes the other of the reference quality factor and the reference peak frequency that is different from the first FOD status packet. ### Claim 2 (depends on 1) The method of claim 1, further comprising: a phase of receiving a reception power packet including information on a reception power intensity from the wireless power receiver, prior to the second determination phase; a phase of determining reception power intensity of the wireless power receiver based on information on the reception power intensity; a phase of measuring or calculating a power loss based on a difference between the determined reception power intensity and the transmission power intensity of the wireless power transmitter; and a phase of correcting any one of a transmission power, a reception power, and a loss of power using the power loss. ### Claim 3 (depends on 1) The method of claim 1, further comprising: a phase of transmitting a detection signal to the wireless power receiver through a transmission coil to detect the existence of the wireless power receiver, prior to the receiving phase; a phase of identifying transmission coils through which a signal strength indicator transmitted from the wireless power receiver is received in response to the detection signal; and a phase of selecting a transmission coil that has received the signal strength indicator as a power transmission coil. ### Claim 4 (depends on 1) The method of claim 1, further comprising: a phase of sequentially transmitting a detection signal to the wireless power receiver a plurality of times through a plurality of transmission coils to detect the existence of the wireless power receiver, prior to the receiving phase; a phase of identifying a transmission coil that has received the signal strength indicator transmitted from the wireless power receiver in response to the detection signal transmitted a plurality of times; and a phase of selecting a transmission coil that has received the signal strength indicator having the most or largest value among the plurality of transmission coils that have received the signal strength indicator as a power transmission coil. ### Claim 5 (depends on 1) The method of claim 1, wherein the first power transfer mode is activated when a NAK response to at least one of the first FOD status packet and the second FOD status packet is transmitted to the wireless power receiver as a result of the determination of the first determination phase. ### Claim 6 (depends on 1) The method of claim 1, wherein the second power transfer mode is activated when an ACK response to the first FOD status packet and the second FOD status packet is transmitted to the wireless power receiver as a result of the determination of the first determination phase. ### Claim 7 (depends on 1) The method of claim 1, wherein the first power transfer mode is for transmitting a first power, and wherein the second power transfer mode is for transmitting a second power greater than the first power. ### Claim 8 (depends on 1) The method of claim 1, wherein the other information includes a power loss value.