# US 2013/0278209 A1 · Adaptive power control for wireless charging of devices > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0278209 A1 - Document ID: US20130278209A1 - Status: Published application - Kind: A1 - Application number: 13/918,365 - Filed: 2013-06-14 - Published: 2013-10-24 - Earliest claimed: 2009-01-22 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: William H. Von Novak, III; Stanley Slavko Toncich; Stanton C. Braden; Ian J. Fevrier - Web page: https://patentgrep.com/patent/US20130278209A1 ## CPC - H02J 7/42: with electronic devices having internal batteries, e.g. mobile phones - H01F 38/14: Inductive couplings - H02J 50/10: using inductive coupling - 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 - H04B 5/79: for data transfer in combination with power transfer - H04W 52/04: Transmission power control [TPC] - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Exemplary embodiments are directed to wireless power transfer. A transmit antenna generates an electromagnetic field having a region for wirelessly transferring power from the transmit antenna to a plurality of receiver devices. A controller is operably coupled to the transmit antenna. The controller determines a power allocation for a particular one of the plurality of receiver devices disposed within the region, and adjusts the power allocation based at least in part on a power requirement received from the particular one of the plurality of receiver devices. ## Claims ### Claim 1 A wireless power transmitter, comprising: a transmit antenna configured to generate an electromagnetic field having a region for wirelessly transferring power from the transmit antenna to a plurality of receiver devices; and a controller operably coupled to the transmit antenna, the controller being configured to: determine a power allocation for a particular one of the plurality of receiver devices disposed within the region, and adjust the power allocation based at least in part on a power requirement received from the particular one of the plurality of receiver devices. ### Claim 2 (depends on 1) The wireless power transmitter of claim 1, wherein the controller is further configured to receive power requirements from the plurality of receiver devices and control the transmit antenna to sequentially charge the plurality of receiver devices based at least in part on the received power requirements. ### Claim 3 (depends on 1) The wireless power transmitter of claim 1, wherein the controller is further configured to determine a power level to share the transferred power between the plurality of receiver devices. ### Claim 4 (depends on 1) The wireless power transmitter of claim 1, wherein the controller is further configured to adjust the power level of the electromagnetic field responsive to a power level request received from one of the plurality of receiver devices. ### Claim 5 (depends on 1) The wireless power transmitter of claim 1, wherein the controller is further configured to determine the power allocation for the particular one of the plurality of receiver devices based at least in part on the distance between the particular receiver device and the transmit antenna. ### Claim 6 (depends on 5) The wireless power transmitter of claim 5, wherein the controller is further configured to allocate different powers for receiver devices that have different distances from the transmit antenna. ### Claim 7 (depends on 1) The wireless power transmitter of claim 1, wherein the controller is further configured to determine the amount of power needed to substantially fully charge the particular one of the plurality of receiver devices to determine the power allocation. ### Claim 8 (depends on 1) The wireless power transmitter of claim 1, wherein the power requirement comprises at least one of the following: a desired power level, the maximum power level, a desired current level, the maximum current level, a desired voltage level, and the maximum voltage level to substantially fully charge the particular one of the plurality of receiver devices. ### Claim 9 A method of wireless power transfer, comprising: generating, at a transmit antenna, an electromagnetic field having a region for wirelessly transferring power from the transmit antenna to a plurality of receiver devices; determining a power allocation for a particular one of the plurality of receiver devices disposed within the region; and adjusting the power allocation based at least in part on a power requirement received from the particular one of the plurality of receiver devices. ### Claim 10 (depends on 9) The method of claim 9, further comprising: monitoring power levels delivered to the plurality of receiver devices; and changing charging parameters in response to the monitored power levels. ### Claim 11 (depends on 10) The method of claim 10, wherein the charging parameters comprise current and voltage levels for delivery to the plurality of receiver devices. ### Claim 12 (depends on 9) The method of claim 9, further comprising: receiving power requirements from the plurality of receiver devices; and sequentially charging the plurality of receiver devices based at least in part on the received power requirements. ### Claim 13 (depends on 9) The method of claim 9, further comprising adjusting an amount of power that is delivered to each receiver device by adjusting the transferred power. ### Claim 14 (depends on 9) The method of claim 9, wherein the power allocation for the particular one of the plurality of receiver devices is determined based at least in part on the distance between the particular receiver device and the transmit antenna. ### Claim 15 (depends on 9) The method of claim 9, wherein the determining comprises allocating different powers for receiver devices that have different distances from the transmit antenna. ### Claim 16 (depends on 9) The method of claim 9, wherein the determining comprises determining the amount of power needed to substantially fully charge the particular one of the plurality of receiver devices. ### Claim 17 (depends on 9) The method of claim 9, wherein the power requirement comprises at least one of the following: a desired power level, the maximum power level, a desired current level, the maximum current level, a desired voltage level, and the maximum voltage level to substantially fully charge the particular one of the plurality of receiver devices. ### Claim 18 A power transfer system, comprising: means for generating an electromagnetic field having a region for wirelessly transferring power to a plurality of receiver devices; means for determining a power allocation for a particular one of the plurality of receiver devices disposed within the region; and means for adjusting the power allocation based at least in part on a power requirement received from the particular one of the plurality of receiver devices. ### Claim 19 (depends on 18) The power transfer system of claim 18, wherein the generating means comprises a transmit antenna, the determining means comprises a first controller, and the adjusting means comprises a second controller. ### Claim 20 (depends on 18) The power transfer system of claim 18, wherein the first controller is further configured to determine the power allocation for the particular one of the plurality of receiver devices based at least in part on the distance between the particular receiver device and the transmit antenna.