Granted Patent B2

US 12,620,835 · App. 18/103,940 · Granted May 5, 2026

Inventors: Jung Ick Moon (Daejeon, KR); Gwangzeen Ko (Daejeon, KR); Sang-Won Kim (Daejeon, KR); Seong-Min Kim (Daejeon, KR); In Kui Cho (Daejeon, KR)

Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

H02J50/12H02J50/40

Abstract

Claims (35)

1 . A wireless power transmission device comprising:

a transmission coil configured to wirelessly transmit power to at least one of a plurality of receivers according to a transmission frequency; and

a processor configured to control at least one of the transmission frequency or resonant frequencies of the plurality of receivers,

wherein the processor is configured to:

set at least one of the resonant frequencies of the plurality of receivers to a frequency lower than the transmission frequency; and set at least one of the resonant frequencies of the plurality of receivers to a frequency higher than the transmission frequency based on the transmission frequency at which the wireless power transmission device wirelessly transmits power, thereby transmitting power to the plurality of receivers simultaneously;

determine a transmission amount of power to be wirelessly transmitted to each of the plurality of receivers; and

change at least one of the transmission frequency or the resonant frequencies of the plurality of receivers based on the transmission amount, and change the resonant frequency of a first receiver among the plurality of receivers so that the resonant frequency of the first receiver approaches the transmission frequency, when the transmission amount for the first receiver is greater than the transmission amounts for the other receivers.

2 . The wireless power transmission device of claim 1 , wherein each of the plurality of receivers is disposed on one side and another side of the transmission coil.

3 . The wireless power transmission device of claim 1 , wherein the processor is configured to change the transmission frequency so that the transmission frequency is close to one of the resonant frequencies of the plurality of receivers.

4 . The wireless power transmission device of claim 1 , wherein the processor is configured to determine the transmission amount based on a battery state and demanded power information received from each of the plurality of receivers.

5 . A wireless power transmission device comprising:

a transmission coil configured to wirelessly transmit power to at least one of a plurality of receivers according to a transmission frequency; and

a processor configured to control at least one of the transmission frequency or resonant frequencies of the plurality of receivers,

wherein the processor is configured to:

set at least one of the resonant frequencies of the plurality of receivers to a frequency lower than the transmission frequency; and set at least one of the resonant frequencies of the plurality of receivers to a frequency higher than the transmission frequency, thereby transmitting power to a plurality of receivers simultaneously;

identify the transmission frequency to wirelessly transmit power and the resonant frequencies of the plurality of receivers, the resonant frequencies being different from each other;

receive demanded power information from the plurality of receivers;

determine a transmission amount of power to be wirelessly transmitted to each of the plurality of receivers, based on the demanded power information;

determine a parameter related to the transmission frequency and the resonant frequencies of the plurality of receivers, based on the transmission amount;

wirelessly transmit power to the plurality of receivers based on the parameter; and

change the resonant frequency of a first receiver among the plurality of receivers so that the resonant frequency of the first receiver approaches the transmission frequency, when the transmission amount for the first receiver is greater than the transmission amounts for the other receivers.

6 . The wireless power transmission device of claim 5 , wherein the processor is configured to determine the parameter so that the transmission frequency is close to one of the resonant frequencies of the plurality of receivers.

7 . A method of wirelessly transmitting power, the method comprising:

setting resonant frequencies of a plurality of receivers differently based on a transmission frequency at which a wireless power transmission device wirelessly transmits power;

determining a transmission amount of power to be wirelessly transmitted to each of the plurality of receivers;

changing at least one of the transmission frequency or the resonant frequencies of the plurality of receivers based on the transmission amount,

wherein the setting of the resonant frequencies of the plurality of receivers differently comprises:

setting at least one of the resonant frequencies of the plurality of receivers to a frequency lower than the transmission frequency; and setting at least one of the resonant frequencies of the plurality of receivers to a frequency higher than the transmission frequency, thereby transmitting power to a plurality of receivers simultaneously; and

changing the resonant frequency of the first receiver so that the resonant frequency of the first receiver approaches the transmission frequency, when the transmission amount for a first receiver among the plurality of receivers is greater than the transmission amounts for the other receivers,

wherein the wireless power transmission device comprises:

a transmission coil configured to wirelessly transmit power to at least one of the plurality of receivers according to the transmission frequency; and

a processor configured to control at least one of the transmission frequency or the resonant frequencies of the plurality of receivers.

8 . The method of claim 7 , wherein the plurality of receivers is disposed in different directions based on the transmission coil.

9 . The method of claim 7 , wherein the changing of at least one of the transmission frequency or the resonant frequencies of the plurality of receivers comprises changing the transmission frequency so that the transmission frequency is close to one of the resonant frequencies of the plurality of receivers.

10 . The method of claim 7 , wherein the determining of the transmission amount comprises determining the transmission amount based on a battery state and demanded power information received from each of the plurality of receivers.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (21)