# US 9,438,074 B2 · Apparatus and method for transmitting wireless power > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,438,074 B2 - Document ID: US9438074B2 - Status: Granted - Kind: B2 - Application number: 13/717,312 - Filed: 2012-12-17 - Published: 2013-06-20 - Granted: 2016-09-06 - Earliest claimed: 2011-12-15 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Kyung-Woo Lee; Kang-Ho Byun; Se-Ho Park - Web page: https://patentgrep.com/patent/US9438074B2 ## CPC - H02J 50/12: of the resonant type - H02J 7/42: with electronic devices having internal batteries, e.g. mobile phones - H02J 50/40: using two or more transmitting or receiving devices (H02J50/50 takes precedence) - 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 - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY ## Abstract A method and a wireless power transmitter are provided for transmitting wireless power to at least one wireless power receiver. The method includes setting, by the wireless power transmitter, a search channel to be used for communication with the at least one wireless power receiver; detecting at least one of an energy level and a Received Signal Strength Indication (RSSI) value of a signal received on the search channel; and determining whether to designate the search channel as a communication channel based on the detection results. ## Claims ### Claim 1 A method of a wireless power transmitter for transmitting wireless power to at least one wireless power receiver, the method comprising: setting, by the wireless power transmitter, a search channel to be used for communication with the at least one wireless power receiver, wherein the search channel is predetermined according to a first communication scheme; detecting at least one of an energy level of a signal received on the search channel and a Received Signal Strength Indication (RSSI) value of the signal received on the search channel, wherein the signal is generated by another electronic device using a second communication scheme; and determining whether to designate the search channel as a communication channel based on the detection results, wherein the another electronic device is separated from the wireless power transmitter or the wireless power receiver, and wherein the first communication scheme is different from the second communication scheme. ### Claim 2 (depends on 1) The method of claim 1, wherein determining whether to designate the search channel comprises: determining whether the at least one of the energy level and the RSSI value of the received signal is less than a predetermined threshold; and designating the search channel as the communication channel, when the at least one of the energy level and the RSSI value is less than the predetermined threshold. ### Claim 3 (depends on 2) The method of claim 2, further comprising changing the search channel to another channel, when the at least one of the energy level and the RSSI value of the received signal is greater than or equal to the predetermined threshold. ### Claim 4 (depends on 3) The method of claim 3, further comprising: determining whether there is a remaining another channel, when at least one of an energy level and an RSSI value of a signal received on the changed search channels is greater than or equal to the threshold; and increasing the threshold, when there is no remaining another channel. ### Claim 5 (depends on 4) The method of claim 4, further comprising: determining whether at least one of an energy level and an RSSI value of a signal received on a search channel is less than the increased threshold; and designating the search channel as the communication channel, if the at least one of the energy level and the RSSI value is less than the increased threshold. ### Claim 6 (depends on 1) The method of claim 1, wherein determining whether to designate the search channel comprises: detecting at least one of an energy level and an RSSI value of a received signal over each of a plurality of search channels; and designating, as the communication channel, a search channel from among the plurality of search channels having a smallest at least one of an energy level and an RSSI value. ### Claim 7 (depends on 1) The method of claim 1, further comprising generating a network Identifier (ID) of the wireless power transmitter based on a notice signal received from another wireless power transmitter. ### Claim 8 (depends on 7) The method of claim 7, wherein the network ID is different from a network ID of the another wireless power transmitter. ### Claim 9 (depends on 7) The method of claim 7, further comprising generating a notice signal including the generated network ID, and transmitting the generated notice signal. ### Claim 10 (depends on 9) The method of claim 9, wherein the notice signal further includes at least one of protocol version information, a sequence number, information about a wireless power receiver, and information about a number of wireless power receivers in management. ### Claim 11 (depends on 1) The method of claim 1, further comprising determining a number of other wireless power transmitters that use the search channel, based on the detection results. ### Claim 12 (depends on 11) The method of claim 11, further comprising designating the search channel as the communication channel, when the number of the other wireless power transmitters that use the search channel is less than a predetermined number. ### Claim 13 (depends on 11) The method of claim 11, further comprising designating the search channel as the communication channel, when the search channel energy level is less than a predetermined threshold, and the number of the other wireless power transmitters that use the search channel is greater than or equal to a predetermined number. ### Claim 14 A wireless power transmitter for transmitting wireless power to at least one wireless power receiver, the wireless power transmitter comprising: a controller that sets a search channel to be used for communication with the at least one wireless power receiver, wherein the search channel is predetermined according to a first communication scheme; and a communication unit that receives a signal on the search channel, wherein the signal is generated by another electronic device using a second communication scheme; wherein the controller detects at least one of an energy level of the received signal and a Received Signal Strength Indication (RSSI) value of the received signal, and determines whether to designate the search channel as a communication channel, based on the detection results, wherein the another electronic device is separated from the wireless power transmitter or the wireless power receiver, and wherein the first communication scheme is different from the second communication scheme. ### Claim 15 (depends on 14) The wireless power transmitter of claim 14, wherein the controller determines whether the at least one of the energy level and the RSSI value of the received signal is less than a predetermined threshold, and designates the search channel as the communication channel, when the at least one of the energy level and the RSSI value is less than the predetermined threshold. ### Claim 16 (depends on 15) The wireless power transmitter of claim 15, wherein the controller changes the search channel to another channel, if the at least one of the energy level and the RSSI value of the received signal is greater than or equal to the predetermined threshold. ### Claim 17 (depends on 16) The wireless power transmitter of claim 16, wherein the controller determines whether there is a remaining another channel, when at least one of an energy level and an RSSI value of a signal received on the changed search channels is greater than or equal to the threshold, and increases the threshold, when there is no remaining another channel. ### Claim 18 (depends on 17) The wireless power transmitter of claim 17, wherein the controller determines whether at least one of an energy level and an RSSI value of a signal received on a search channel is less than the increased threshold, and determines the search channel as the communication channel, if the at least one of the energy level and the RSSI value is less than the increased threshold. ### Claim 19 (depends on 14) The wireless power transmitter of claim 14, wherein the controller detects at least one of an energy level and an RSSI value of a received signal over each of a plurality of search channels, and designates, as the communication channel, a search channel from among the plurality of search channels having a smallest at least one of an energy level and an RSSI value. ### Claim 20 (depends on 14) The wireless power transmitter of claim 14, wherein the controller generates a network Identifier (ID) of the wireless power transmitter based on a notice signal received from another wireless power transmitter. ### Claim 21 (depends on 20) The wireless power transmitter of claim 20, wherein the network ID is different from a network ID of the another wireless power transmitter. ### Claim 22 (depends on 20) The wireless power transmitter of claim 20, wherein the communication unit generates a notice signal including the generated network ID, and transmits the generated notice signal. ### Claim 23 (depends on 22) The wireless power transmitter of claim 22, wherein the notice signal further includes at least one of protocol version information, a sequence number, information about a wireless power receiver, and information about a number of wireless power receivers in management. ### Claim 24 (depends on 14) The wireless power transmitter of claim 14, wherein the controller determines a number of other wireless power transmitters that use the search channel, based on the detection results. ### Claim 25 (depends on 24) The wireless power transmitter of claim 24, wherein the controller designates the search channel as the communication channel, if the number of the other wireless power transmitters that use the search channel is less than a predetermined number. ### Claim 26 (depends on 24) The wireless power transmitter of claim 24, wherein the controller designates the search channel as the communication channel, when the search channel energy level is less than a predetermined threshold, and the number of the other wireless power transmitters that use the search channel is greater than or equal to a predetermined number.