# US 12,184,092 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 12,184,092 B2 - Document ID: US12184092B2 - Status: Granted - Kind: B2 - Application number: 18/355,870 - Filed: 2023-07-20 - Published: 2023-11-09 - Granted: 2024-12-31 - 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/US12184092B2 ## 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 wireless power transmitter for transmitting power to a wireless power receiver, including a controller configured to determine whether a foreign object is present; and a transmission part configured to transmit wireless power according to whether the foreign object is present, wherein the controller receives a foreign object detection status packet including at least one of a reference quality factor and a reference peak frequency from the wireless power receiver, and detects whether the foreign object is present based on the foreign object detection status packet, wherein the controller transmits a NAK response indicating that the foreign object is present or an ACK response indicating that the foreign object is not present to the wireless power receiver, and wherein the transmission part transmits a first power to the wireless power receiver according to the transmitted NAK response or transmits a second power greater than the first power to the wireless power receiver according to the transmitted ACK response. ## Claims ### Claim 1 A wireless power transmitter for transmitting power to a wireless power receiver, comprising: a controller configured to determine whether a foreign object is present; and a transmission part configured to transmit wireless power according to whether the foreign object is present, wherein the controller receives a foreign object detection status packet including at least one of a reference quality factor and a reference peak frequency from the wireless power receiver, and detects whether the foreign object is present based on the foreign object detection status packet, wherein the controller transmits a NAK response indicating that the foreign object is present or an ACK response indicating that the foreign object is not present to the wireless power receiver, and wherein the transmission part transmits a first power to the wireless power receiver according to the transmitted NAK response or transmits a second power greater than the first power to the wireless power receiver according to the transmitted ACK response. ### Claim 2 (depends on 1) The wireless power transmitter of claim 1, wherein the transmission part transmits third power between the first power and the second power based on a change in a power transmission environment. ### Claim 3 (depends on 1) The wireless power transmitter of claim 1, wherein the first power is 5 W. ### Claim 4 (depends on 3) The wireless power transmitter of claim 3, wherein the second power is 15 W. ### Claim 5 (depends on 1) The wireless power transmitter of claim 1, wherein the foreign object detection status packet is received from the wireless power receiver to detect whether the foreign object is present, prior to transmitting power to the wireless power receiver. ### Claim 6 (depends on 1) The wireless power transmitter of claim 1, wherein the controller further detects whether the foreign object is present based on a loss of transmission power or a change in temperature during transmission of the second power to the wireless power receiver. ### Claim 7 (depends on 6) The wireless power transmitter of claim 6, wherein the controller measures intensity of transmission power transmitted to the power receiver, receives information on intensity of reception power corresponding to the measured intensity of the transmission power from the wireless power receiver, estimates power loss based on a difference value between the intensity of the transmission power and the intensity of the reception power, and compares the estimated power loss with a preset power loss reference value in order to determine whether the foreign object is present during a predetermined period. ### Claim 8 (depends on 1) The wireless power transmitter of claim 1, wherein the transmission part transmits the first power to the wireless power receiver in response to the transmitted NAK response in order to prevent power transmission to the wireless power receiver from being stopped. ### Claim 9 (depends on 1) The wireless power transmitter of claim 1, wherein the transmission part stops power transmission when detecting again that the foreign object is present while transmitting the first power. ### Claim 10 (depends on 1) The wireless power transmitter of claim 1, wherein the controller renegotiates a size of the power transmission when a state change of the wireless power transmitter occurs while transmitting the second power.