# US 2026/0100608 A1 · Wireless power transfer system, and power control method and apparatus therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2026/0100608 A1 - Document ID: US20260100608A1 - Status: Published application - Kind: A1 - Application number: 19/348,921 - Filed: 2025-10-03 - Published: 2026-04-09 - Earliest claimed: 2024-10-08 - Assignees: Electronics and Telecommunications Research Institute - Applicants: Electronics and Telecommunications Research Institute - Inventors: Kye Seok YOON; Gwang Zeen KO; Sang Won KIM; Seong Min KIM; In Kui CHO - Web page: https://patentgrep.com/patent/US20260100608A1 ## CPC - H02J 50/40: using two or more transmitting or receiving devices (H02J50/50 takes precedence) - H02J 50/12: of the resonant type - H02J 50/80: involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY ## Abstract The present invention relates to a wireless power transfer system, which includes a first receiver configured to wirelessly receive power, a second receiver configured to wirelessly receive power, and a transmitter configured to modulate power transmitted to the first receiver and the second receiver according to power actually transmitted to the first receiver and the second receiver, thereby evenly distributing the power to two independent receivers, a first receiver and a second receiver, using bidirectional coils and increasing power efficiency. ## Claims ### Claim 1 A wireless power transfer system comprising: a first receiver configured to wirelessly receive power; a second receiver configured to wirelessly receive power; and a transmitter configured to modulate power transmitted to the first receiver and the second receiver according to power actually transmitted to the first receiver and the second receiver. ### Claim 2 (depends on 1) The wireless power transfer system of claim 1, wherein the first receiver and the second receiver are independently disposed to be spaced apart from each other. ### Claim 3 (depends on 1) The wireless power transfer system of claim 1, wherein the transmitter includes: a transmitting coil through which power is transmitted to the first receiver and the second receiver; an inverter that converts DC input power into AC power; and a processor that controls the inverter according to the power actually transmitted to the first receiver and the second receiver through the transmitting coil to modulate the power transmitted from the transmitting coil to the first receiver and the second receiver. ### Claim 4 (depends on 3) The wireless power transfer system of claim 3, wherein the processor controls a duty of the inverter to adjust a total amount of power of the first receiver and the second receiver. ### Claim 5 (depends on 4) The wireless power transfer system of claim 4, wherein the processor compares a sum of a first voltage applied on a first receiving coil of the first receiver and a second voltage applied on a second receiving coil of the second receiver with a preset target voltage and controls the duty of the inverter according to a result of the comparison. ### Claim 6 (depends on 3) The wireless power transfer system of claim 3, wherein the processor controls an operating frequency of the inverter to adjust a power balance between the first receiver and the second receiver. ### Claim 7 (depends on 6) The wireless power transfer system of claim 6, wherein, when a sum of a first voltage applied on a first receiving coil of the first receiver and a second voltage applied on a second receiving coil of the second receiver matches a preset target voltage, the processor compares the first voltage with the second voltage and controls the operating frequency of the inverter according to a result of the comparison. ### Claim 8 (depends on 1) The wireless power transfer system of claim 1, wherein a resonant frequency of the first receiver and a resonant frequency of the first receiver are different from each other. ### Claim 9 A power control apparatus for a wireless power transfer system, the power control apparatus comprising: a transmitting coil through which power is transmitted to a first receiver and a second receiver which wirelessly receive power; an inverter configured to convert DC input power into AC power; and a processor configured to modulate the power transmitted from the transmitting coil to the first receiver and the second receiver according to the power actually transmitted to the first receiver and the second receiver through the transmitting coil. ### Claim 10 (depends on 9) The power control apparatus of claim 9, wherein the processor controls a duty of the inverter to adjust a total amount of power of the first receiver and the second receiver. ### Claim 11 (depends on 10) The power control apparatus of claim 10, wherein the processor compares a sum of a first voltage applied on a first receiving coil of the first receiver and a second voltage applied on a second receiving coil of the second receiver with a preset target voltage and controls the duty of the inverter according to a result of the comparison. ### Claim 12 (depends on 9) The power control apparatus of claim 9, wherein the processor controls an operating frequency of the inverter to adjust a power balance between the first receiver and the second receiver. ### Claim 13 (depends on 12) The power control apparatus of claim 12, wherein, when a sum of a first voltage applied on a first receiving coil of the first receiver and a second voltage applied on a second receiving coil of the second receiver matches a preset target voltage, the processor compares the first voltage with the second voltage and controls the operating frequency of the inverter according to a result of the comparison. ### Claim 14 A power control method for a wireless power transfer system, the power control method comprising: controlling, by a processor, an inverter to wirelessly transmit power to a first receiver and a second receiver through a transmitting coil; and modulating, by the processor, the power transmitted from the transmitting coil to the first receiver and the second receiver according to the power actually transmitted to the first receiver and the second receiver through the transmitting coil. ### Claim 15 (depends on 14) The power control method of claim 14, wherein, in the modulating of the power, the processor controls a duty of the inverter to adjust a total amount of power of the first receiver and the second receiver. ### Claim 16 (depends on 15) The power control method of claim 15, wherein, in the modulating of the power, the processor compares a sum of a first voltage applied on a first receiving coil of the first receiver and a second voltage applied on a second receiving coil of the second receiver with a preset target voltage and controls the duty of the inverter according to a result of the comparison. ### Claim 17 (depends on 14) The power control method of claim 14, wherein, in the modulating of the power, the processor controls an operating frequency of the inverter to adjust a power balance between the first receiver and the second receiver. ### Claim 18 (depends on 17) The power control method of claim 17, wherein, in the modulating of the power, when a sum of a first voltage applied on a first receiving coil of the first receiver and a second voltage applied on a second receiving coil of the second receiver matches a preset target voltage, the processor compares the first voltage with the second voltage and controls the operating frequency of the inverter according to a result of the comparison.