# US 2014/0197785 A1 · Wireless power transmitter, wireless power receiver, and control methods thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0197785 A1 - Document ID: US20140197785A1 - Status: Published application - Kind: A1 - Application number: 14/155,922 - Filed: 2014-01-15 - Published: 2014-07-17 - Earliest claimed: 2013-01-15 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Kyung-Woo LEE; Kang-Ho BYUN; Seho PARK - Web page: https://patentgrep.com/patent/US20140197785A1 ## CPC - H02J 50/12: of the resonant type - H02J 50/10: using inductive coupling - 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 - H04B 5/79: for data transfer in combination with power transfer - H02J 7/42: with electronic devices having internal batteries, e.g. mobile phones - H04B 5/26: using coils - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - H04B: TRANSMISSION ## Abstract A wireless power transmitter and method are provided for transmitting charging power to a wireless power receiver. The method includes transmitting, to the wireless power receiver, a control signal including first time information and load change information; detecting a load change of the wireless power receiver during a period of time corresponding to the first time information; and determining that the wireless power receiver is authorized for charging, if the detected load change of the wireless power receiver corresponds to the load change information included in the control signal. ## Claims ### Claim 1 A method for controlling a wireless power transmitter to transmit charging power to a wireless power receiver, the method comprising: transmitting, to the wireless power receiver, a control signal including first time information and load change information; detecting a load change of the wireless power receiver during a period of time corresponding to the first time information; and determining that the wireless power receiver is authorized for charging, if the detected load change of the wireless power receiver corresponds to the load change information included in the control signal. ### Claim 2 (depends on 1) The method of claim 1, further comprising determining that the wireless power receiver is cross-connected, if the detected load change of the wireless power receiver does not correspond to the load change information included in the control signal. ### Claim 3 (depends on 1) The method of claim 1, wherein the load change information includes information to instruct a change of a load switch of the wireless power receiver from an off state to an on state during the period of time corresponding to the first time information. ### Claim 4 (depends on 1) The method of claim 1, wherein the control signal further includes second time information, the method further comprising: after a lapse of the period of time corresponding to the first time information, detecting a load change of the wireless power receiver during a period of time corresponding to the second time information; and determining that the wireless power receiver is authorized for charging, if the detected load change of the wireless power receiver during the period of time corresponding to the second time information corresponds to load change information included in the control signal. ### Claim 5 (depends on 4) The method of claim 4, further comprising determining that the wireless power receiver is cross-connected, if the detected load change of the wireless power receiver during the period of time corresponding to the second time information does not correspond to the load change information included in the control signal. ### Claim 6 (depends on 4) The method of claim 4, wherein the load change information includes information to instruct a change of a load switch of the wireless power receiver from an on state to an off state during the period of time corresponding to the second time information. ### Claim 7 A wireless power transmitter for transmitting charging power to a wireless power receiver, the wireless power transmitter comprising: a communication unit configured to transmit a control signal including first time information and load change information to the wireless power receiver; a controller configured to detect a load change of the wireless power receiver during a period of time corresponding to the first time information, and to determine that the wireless power receiver is authorized for charging, if the detected load change of the wireless power receiver corresponds to the load change information included in the control signal; and a power transmitting unit configured to apply the charging power to the wireless power receiver authorized for charging. ### Claim 8 (depends on 7) The wireless power transmitter of claim 7, wherein the controller is configured to determine that the wireless power receiver is cross-connected, if the detected load change of the wireless power receiver does not correspond to the load change information included in the control signal. ### Claim 9 (depends on 7) The wireless power transmitter of claim 7, wherein the load change information comprises information to instruct a change of a load switch of the wireless power receiver from an off state to an on state during the period of time corresponding to the first time information. ### Claim 10 (depends on 7) The wireless power transmitter of claim 7, wherein the control signal further comprises second time information, and wherein the controller is configured to detect a load change of the wireless power receiver during a period of time corresponding to the second time information, after a lapse of the period of time corresponding to the first time information, and to determine that the wireless power receiver is authorized for charging, if the detected load change of the wireless power receiver during the period of time corresponding to the second time information corresponds to the load change information included in the control signal. ### Claim 11 (depends on 10) The wireless power transmitter of claim 10, wherein the controller is configured to determine that the wireless power receiver is cross-connected, if the detected load change of the wireless power receiver during the period of time corresponding to the second time information does not correspond to the load change information included in the control signal. ### Claim 12 (depends on 10) The wireless power transmitter of claim 10, wherein the load change information comprises information to instruct a change of a load switch of the wireless power receiver from an on state to an off state during the period of time corresponding to the second time information. ### Claim 13 A method for controlling a wireless power receiver to receive charging power from a wireless power transmitter, the method comprising: receiving, from the wireless power transmitter, a control signal including first time information and load change information; changing a load state according to the load change information, during a period of time corresponding to the first time information; and returning the load state back to a previous state before the changing, after a lapse of the period of time corresponding to the first time information. ### Claim 14 (depends on 13) The method of claim 13, wherein the load change information includes information to instruct a change of a load switch of the wireless power receiver from an off state to an on state during the period of time corresponding to the first time information. ### Claim 15 (depends on 13) The method of claim 13, wherein the control signal further includes second time information, the further comprising: after the lapse of the period of time corresponding to the first time information, changing the load state according to the load change information during a period of time corresponding to the second time information; and returning the load state back to a state before the changing, after a lapse of the period of time corresponding to the second time information. ### Claim 16 (depends on 15) The method of claim 15, wherein the load change information includes information to instruct a change of a load switch of the wireless power receiver from an on state to an off state during the period of time corresponding to the second time information. ### Claim 17 A wireless power receiver for receiving charging power from a wireless power receiver, the wireless power receiver comprising: a communication unit configured to receive a control signal including first time information and load change information from the wireless power transmitter; a charging unit configured to charge the wireless power receiver at the charging power received from the wireless power transmitter; a load switch configured to switch a connection state of the charging unit to be in an on or off state; and a controller configured to controlling the load switch to be changed into the on state during a period of time corresponding to the first time information, based on the load change information. ### Claim 18 (depends on 17) The wireless power receiver of claim 17, wherein the control signal further comprises second time information, and wherein the controller controls the load switch to be changed into the off state during a period of time corresponding to the second time information, after a lapse of the period of time corresponding to the first time information.