# US 11,444,489 B2 · Electronic apparatus, system and method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,444,489 B2 - Document ID: US11444489B2 - Status: Granted - Kind: B2 - Application number: 16/563,711 - Filed: 2019-09-06 - Published: 2020-04-30 - Granted: 2022-09-13 - Earliest claimed: 2018-10-29 - Assignees: Kabushiki Kaisha Toshiba - Applicants: Kabushiki Kaisha Toshiba - Inventors: Toshiya Mitomo; Kentaro Taniguchi - Web page: https://patentgrep.com/patent/US11444489B2 ## CPC - H04B 5/79: for data transfer in combination with power transfer - H02J 50/12: of the resonant type - H02J 50/20: using microwaves or radio frequency waves - H02J 50/402: {the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas} - H02J 50/60: responsive to the presence of foreign objects, e.g. detection of living beings - H02J 50/80: involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices - H02J 50/23: characterised by the type of transmitting antennas, e.g. directional array antennas or Yagi antennas - H04B: TRANSMISSION - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY ## Abstract According to one embodiment, an wireless power transmission apparatus includes a plurality of antennas, a power transmission circuit, a measuring circuit and a control circuit. The power transmission circuit is configured to transmit a beam of a first wireless signal from the plurality of antennas. The measuring circuit is configured to receive a second wireless signal with the plurality of antennas. The control circuit is configured to: detect an object in a direction of the beam based on the second wireless signal received at a plurality of timings; and change a shape of the beam by controlling at least either an amplitude or a phase of the first wireless signal provided to each antenna of the plurality of antennas. ## Claims ### Claim 1 An electronic apparatus, comprising: a plurality of antennas; a power transmission circuit configured to transmit a beam of a first wireless signal from the plurality of antennas; a measuring circuit configured to receive a second wireless signal including propagation path information transmitted by at least one power receiving apparatus; and a control circuit configured to: detect an object located between the plurality of antennas and the least one power receiving apparatus in a direction of the beam based on the second wireless signal received at a plurality of timings; and change a shape of the beam in relation to the detected object based on the propagation path information by controlling at least either an amplitude or a phase of the first wireless signal provided to each antenna in the plurality of antennas. ### Claim 2 (depends on 1) The electronic apparatus of claim 1, wherein the control circuit is configured to detect the object in the direction of the beam based on at least a time domain waveform or a frequency domain waveform of the second wireless signal received at the plurality of timings. ### Claim 3 (depends on 1) The electronic apparatus of claim 1, wherein the control circuit is configured to reduce a gain of the beam in a direction the object is detected. ### Claim 4 (depends on 1) The electronic apparatus of claim 1, wherein the control circuit is configured to increase a gain of the beam in a direction the object is not detected. ### Claim 5 (depends on 1) The electronic apparatus of claim 1, wherein the control circuit is configured to: receive the second wireless signal from a plurality of angles; determine that the object is moving in a certain direction based on the fact that the object is detected in angles which are adjacent with respect to a rotational direction at a plurality of timings; and reduce a gain of the beam in a direction the object is moving. ### Claim 6 (depends on 1) The electronic apparatus of claim 1, wherein the control circuit is configured to select the beam which is transmitted from a predetermined set of beams. ### Claim 7 (depends on 1) The electronic apparatus of claim 1, wherein the control circuit is configured to reduce at least a transmission power or a duty ratio of the first wireless signal when the object is detected in the direction of the beam. ### Claim 8 (depends on 1) The electronic apparatus of claim 1, wherein the control circuit is configured to execute a power transmission process and a measurement process alternately, wherein the power transmission circuit is configured to transmit the beam during the power transmission process, and the measuring circuit is configured to receive the second wireless signal to detect the object in the direction of the beam and the control circuit is configured to change the shape of the beam by controlling at least the amplitude or the phase of the first wireless signal provided to the plurality of antennas during the measurement process. ### Claim 9 (depends on 8) The electronic apparatus of claim 8, wherein the control circuit is configured to change a directivity of the transmitted beam at each of the power transmission processes using a first set of beams including a plurality of beams, each of the plurality of beams having different directivities. ### Claim 10 (depends on 9) The electronic apparatus of claim 9, wherein the control circuit is configured to detect the object in directions of at least either one of the beams included in the first set and change the directivity of the transmitted beam at each of the power transmission processes, using a second set which is part of the first set, the second set not including the beams with directivity in the direction of the detected object. ### Claim 11 (depends on 10) The electronic apparatus of claim 10, wherein the control circuit is configured to confirm that the object is no longer detected in the directions of at least either one of the beams included in the first set and change the directivity of the transmitted beam at each of the power transmission processes, using the first set. ### Claim 12 (depends on 1) The electronic apparatus of claim 1, wherein the control circuit is configured to detect the object and determine the direction of the object after at least either increasing the directivity of the plurality of antennas during reception or extending a reception period of the second wireless signal. ### Claim 13 (depends on 1) The electronic apparatus of claim 1, further comprising: a sensor circuit configured to detect the object, wherein the control circuit is configured to detect the object in the direction of the beam based on additionally a signal of the sensor circuit, and change the shape of the beam by controlling at least the amplitude or the phase of the first wireless signal provided to the plurality of antennas. ### Claim 14 A system comprising: an electronic apparatus configured to transmit a beam of a first wireless signal from a plurality of antennas; a power receiving apparatus configured to transmit a second wireless signal and receive power supplied by the beam of the first wireless signal; and said electronic apparatus further configured to receive the second wireless signal from the plurality of antennas, detect an object located between the electronic apparatus and the power receiving apparatus in a direction of the beam based the second wireless signal received at the plurality of timings, and change a shape of the beam in relation to the object based on the propagation path information by controlling at least either an amplitude or a phase of the first wireless signal provided to each antenna of the plurality of antennas. ### Claim 15 (depends on 14) The system of claim 14, further comprising: a wireless communication apparatus configured to transmit the second wireless signal. ### Claim 16 A method comprising: a power transmission apparatus transmitting a beam of a first wireless signal from a plurality of antennas; a power receiving apparatus receiving power supplied by the beam of the first wireless signal; the power receiving apparatus transmitting a second wireless signal; the power transmission apparatus receiving the second wireless signal with the plurality of antennas; the power transmission apparatus detecting an object located between the plurality of antennas and the power receiving apparatus in a direction of the beam based on the second wireless signal received at the plurality of timings; the power transmission apparatus changing a shape of the beam in relation to the detected object based on the propagation path information by controlling at least either an amplitude or a phase of the first wireless signal provided to each antenna of the plurality of antennas. ### Claim 17 (depends on 16) The method of claim 16, further comprising: a wireless communication apparatus transmitting the second wireless signal, the wireless communication apparatus being provided separately from the power transmission apparatus and the power receiving apparatus. ### Claim 18 (depends on 1) The electronic apparatus of claim 1, wherein, wherein the measuring circuit receives the second wireless signal transmitted from a wireless communication apparatus which does not receive power transmission by the first wireless signal from the power transmission circuit. ### Claim 19 (depends on 1) The electronic apparatus of claim 1, wherein the power transmission circuit is configured to transmit a third wireless signal for data communication with the plurality of antennas; and the power receiving apparatus receives the third wireless signal and is a target to receive power transmission by the beam of the first wireless signal. ### Claim 20 (depends on 14) The system of claim 14, wherein the electronic apparatus is configured to transmit a third wireless signal for data communication with the plurality of antennas; and the power receiving apparatus is configured to receive the third wireless signal and transmit the second wireless signal. ### Claim 21 (depends on 16) The method of claim 16, wherein the power transmission apparatus is configured to transmit a third wireless signal for data communication with the plurality of antennas; and the power receiving apparatus is configured to receive the third wireless signal and transmit the second wireless signal. ### Claim 22 (depends on 1) The electronic apparatus of claim 1, wherein the measuring circuit is configured to receive the second wireless signal with the plurality of antennas. ### Claim 23 (depends on 1) The electronic apparatus of claim 1, wherein the control circuit is configured to detect the object located between the plurality of antennas and the least one power receiving apparatus in the direction of the beam based on said propagation path information including at least one of time domain waveforms, amplitudes, phases, frequency domain waveforms, incoming directions and channel matrices of the second wireless signal received at the plurality of timings. ### Claim 24 (depends on 1) The system of claim 1, wherein the control circuit executes a process including at least either reduction of a transmission power of the first wireless signal or reduction of a duty ratio of the first wireless signal, when it is determined that the object is present. ### Claim 25 (depends on 16) The method of claim 16, wherein the power transmission apparatus executes a process including at least either reduction of a transmission power of the first wireless signal or reduction of a duty ratio of the first wireless signal, when it is determined that the object is present.