Wireless power supply system

Abstract

To solve the problem in which interference of communication radio waves cannot be suppressed when communication is performed between a transmitter and a plurality of receivers.SOLUTION: In a wireless power supply system consisting of at least one transmitter and a plurality of receivers, the transmitter can wirelessly supply power to the plurality of receivers, and the plurality of receivers can wirelessly communicate with the transmitter so as to suppress interference of each receiver by using different time-series radio wave strengths from each other.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a wireless power supply system. [Background technology]

[0002] 2. Description of the Related Art Techniques for wirelessly transmitting power are known. Patent Document 1 discloses a technique for preventing divergence or oscillation from occurring in the rectified voltage of a receiver even if the feedback delay becomes long in a wireless power transmission system. Patent Document 2 discloses a technology that provides a system and method for optimally delivering pulsed wireless power using a transmitter assembly that is useful for optimizing the delivery of wireless power to multiple receivers. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-196290 A [Patent Document 2] JP 2019-170154 A Summary of the Invention [Problem to be solved by the invention]

[0004] When communication is performed between a transmitter and a plurality of receivers, there is a problem that interference between communication waves cannot be suppressed. Therefore, the present disclosure has been made to solve the above problem, and its purpose is to provide a technology for suppressing interference of communication radio waves when communication is performed between a transmitter and multiple receivers. [Means for solving the problem]

[0005] A wireless power supply system comprising at least one transmitter and multiple receivers, in which the transmitter is capable of wirelessly supplying power to the multiple receivers, and the multiple receivers are capable of wirelessly communicating with the transmitter so as to suppress interference between each of the receivers by using different time-series radio wave strengths. Effect of the Invention

[0006] According to the present disclosure, it is possible to suppress interference of communication radio waves when communication is performed between a transmitter and multiple receivers. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a diagram showing the overall configuration of a WPT system 1 according to an embodiment of the present invention. [Diagram 2] 1 is a block diagram showing an example configuration of a transmitter 100 and a receiver 200. FIG. [Diagram 3] FIG. 2 is a block diagram showing the basic hardware configuration of a computer 90. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. In all the drawings explaining the embodiment, the same reference numerals are given to common components, and repeated explanations are omitted. Note that the following embodiment does not unduly limit the contents of the present disclosure described in the claims. In addition, not all of the components shown in the embodiment are essential components of the present disclosure. In addition, each figure is a schematic diagram and is not necessarily illustrated strictly.

[0009] <Summary> <1 Overall system configuration> FIG. 1 is a diagram showing the overall configuration of a WPT system 1 according to this embodiment.

[0010] The WPT system 1 shown in Fig. 1 includes, for example, a transmitter 100, a receiver 200, a first information processing device 300, and a second information processing device 400. The WPT system 1 shown in Fig. 1 is used, for example, in a building or a factory. Note that the connection between the transmitter 100 and the first information processing device 300, and the connection between the first information processing device 300 and the second information processing device 400 may be wired or wireless.

[0011] The WPT system 1 in the present disclosure is applicable to fields such as FA (Factory Automation) equipment and robot equipment. Specifically, by applying the WPT system 1 to FA equipment, robot equipment, etc., it is possible to reduce wiring costs and maintenance costs associated with wiring. In addition, it is possible to suppress failures due to disconnection.

[0012] The WPT system 1 can be applied to automated guided vehicle (AGV) and autonomous mobile robot (AMR). Automatic guided vehicle and autonomous mobile robot are used to transport parts and products within a factory. By using a wireless power supply system, the robot can be powered even when stopped, which allows for longer operating hours and reduced waiting time at charging stations.

[0013] The WPT system 1 can be applied to industrial robot arms. Industrial robot arms are used for tasks such as assembly, inspection, and welding. By introducing a wireless power supply system, power cables are eliminated, allowing the robot to move more freely. This improves work efficiency and alleviates restrictions on installation locations. It also reduces maintenance costs associated with wiring and failures due to broken wires.

[0014] The WPT system 1 can be applied to sensors and surveillance cameras. Applying a wireless power supply system to sensors and surveillance cameras that monitor temperature, humidity, vibration, etc. in a factory eliminates the need for battery replacement and wiring work. This reduces maintenance costs and makes it easier to install more sensors.

[0015] The WPT system 1 can be applied to smart factories. In smart factories, the WPT system 1 facilitates connections between equipment and devices, enabling real-time information exchange and remote control. This can improve the production efficiency of smart factories and reduce downtime.

[0016] 1 shows an example in which the WPT system 1 includes three transmitters 100, but the number of transmitters 100 included in the WPT system 1 is not limited to three. The number of transmitters 100 included in the WPT system 1 may be two or less, or may be four or more.

[0017] 1 shows an example in which the WPT system 1 includes seven receivers 200, but the number of receivers 200 included in the WPT system 1 is not limited to seven. The number of receivers 200 included in the WPT system 1 may be six or less, or eight or more.

[0018] 1 shows an example in which the WPT system 1 includes two first information processing devices 300, but the number of first information processing devices 300 included in the WPT system 1 is not limited to two. The number of first information processing devices 300 included in the WPT system 1 may be one, or three or more.

[0019] The transmitter 100 is capable of supplying power to a plurality of receivers 200 wirelessly. Specifically, the transmitter 100 transmits, for example, a power supply signal or a data signal (hereinafter collectively referred to as a wireless signal) to the receiver 200. The transmitter 100 transmits a power supply signal (supplies wireless power) to the receiver 200 by radio waves in the 920 MHz band, for example. The transmitter 100 transmits a data signal to the receiver 200 by radio waves in the 2.4 GHz band, for example. The transmitter 100 may transmit a data signal by radio waves in the 920 MHz band.

[0020] The transmitter 100 may transmit a power supply signal to one receiver 200, for example, or may transmit a power supply signal to multiple receivers 200. The transmitter 100 may transmit a data signal to one receiver 200, for example, or may transmit a data signal to multiple receivers 200. The transmitter 100 may transmit the same data signal as another transmitter 100, for example, or may transmit a data signal different from that of the other transmitters 100. The transmitter 100 may transmit a predetermined command signal as a data signal to the receiver 200, for example, or may transmit a preset signal as a data signal to the receiver 200.

[0021] The transmitter 100 receives, for example, a data signal transmitted from the receiver 200. The transmitter 100 may receive, for example, a data signal transmitted from one receiver 200, or may receive data signals transmitted from a plurality of receivers 200. The transmitter 100 transmits the data signal transmitted from the receiver 200 to the first information processing device 300. The transmitter 100 transmits information related to the state of the transmitter 100 to the first information processing device 300.

[0022] The receiver 200 receives, for example, a power supply signal or a data signal transmitted from the transmitter 100. For example, if the receiver 200 has a battery, the receiver 200 converts the power supply signal transmitted from the transmitter 100 into electric power and stores the converted electric power in the battery. For example, if the receiver 200 has a predetermined sensor, the receiver 200 converts the power supply signal transmitted from the transmitter 100 into electric power and drives the sensor with the converted electric power.

[0023] The receiver 200 transmits, for example, information about the state of the receiver 200 or information about a measurement result by a sensor as a data signal to the transmitter 100. In other words, the multiple receivers 200 can transmit sensing data acquired by a sensing device included in the receiver 200 to the transmitter 100 via wireless communication.

[0024] The first information processing device 300 is an information processing device that monitors the operation of the transmitter 100 and the receiver 200 housed in the WPT system 1. For example, the first information processing device 300 determines whether the transmitter 100 or the receiver 200 is in a preset state based on information about the state of the transmitter 100 and the receiver 200 transmitted from the transmitter 100. If it is determined that the transmitter 100 or the receiver 200 is in a preset state, the first information processing device 300 transmits predetermined information to the second information processing device 400.

[0025] In addition, the first information processing device 300 accumulates information about the transmitter 100 and the receiver 200 accommodated in the WPT system 1. For example, the first information processing device 300 stores information about the states of the transmitter 100 and the receiver 200 transmitted from the transmitter 100 in a storage unit provided in the first information processing device 300.

[0026] In addition, the first information processing device 300 controls the operation of the transmitter 100 accommodated in the WPT system 1.

[0027] Moreover, the first information processing device 300 controls the operation of the transmitter 100 accommodated in the WPT system 1. For example, the first information processing device 300 transmits a predetermined instruction or information to the transmitter 100.

[0028] In addition, the first information processing device 300 controls the operation of the second information processing device 400 .

[0029] The second information processing device 400 is, for example, an information processing device operated by an administrator of the WPT system 1. When the second information processing device 400 receives a notification from the first information processing device 300 that the transmitter 100, the receiver 200, or both of them housed in the WPT system 1 are in a predetermined state, the second information processing device 400 presents to the user that the transmitter 100, the receiver 200, or both of them are in the predetermined state.

[0030] Moreover, the second information processing device 400 analyzes information on the status of the transmitter 100 and the receiver 200 stored in the first information processing device 300, and presents predetermined information to the user. The predetermined information is, for example, the following. Information regarding placement of transmitter 100 Information regarding the placement of the receiver 200 Power consumption information Power intensity information

[0031] <1.1 Transmitter and receiver configuration> FIG. 2 is a block diagram showing an example of the configuration of the transmitter 100 and the receiver 200 shown in FIG. 1. As shown in FIG. 2, the transmitter 100 and the receiver 200 are, for example, spaced apart from each other at a predetermined interval. For example, the transmitter 100 and the receiver 200 are installed at a distance of about several meters apart. Specifically, for example, the transmitter 100 is fixedly installed at a predetermined high position provided in a high place indoors, for example, on a ceiling or a wall. The receiver 200 is installed in a predetermined device indoors, or placed near a device that requires power supply. The receiver 200 may also be carried by a user. The transmitter 100 transmits a power supply signal to the receiver 200 by radio waves of a predetermined frequency, for example, 920 MHz band. The receiver 200 converts the power supply signal transmitted from the transmitter 100 into power, and charges the device with the converted power, or supplies the converted power to the predetermined device.

[0032] The transmitter 100 includes, for example, an oscillator 101, a transmitting antenna 102, a microcomputer (controller) 103, a data transceiver 104, and a data transmitting / receiving antenna 105. The oscillator 101, the microcomputer 103, the data transceiver 104, and the data transmitting / receiving antenna 105, or at least any combination of these, may be mounted on, for example, a PCB (printed circuit board).

[0033] The oscillator 101 oscillates a signal in a predetermined frequency band, for example, the 920 MHz band. The oscillated signal may be amplified and unnecessary frequency components may be removed, if necessary.

[0034] The transmitting antenna 102 is formed so as to be capable of efficiently transmitting radio waves in the 920 MHz band, for example. The transmitting antenna 102 radiates a signal oscillated by an oscillator 101 as a power supply signal.

[0035] The microcomputer 103 controls the operation of the transmitter 100. The microcomputer 103 is realized by, for example, a single board computer equipped with an ARM processor. The microcomputer 103 controls, for example, the transmission of radio waves by the transmission antenna 102.

[0036] The data transceiver 104 performs processes such as converting digital data to analog data, modulating analog data, etc. The data transceiver 104 also performs processes such as demodulating a data signal received by the data transceiver antenna 105, and digitizing the demodulated data. For example, the data transceiver 104 extracts a predetermined signal from the data signal received by the data transceiver antenna 105, converts it into digital data, and transmits it to the microcomputer 103.

[0037] The data transmission / reception antenna 105 is formed to be capable of efficiently transmitting and receiving radio waves in the 2.4 GHz band, for example. The data transmission / reception antenna 105 radiates a data signal supplied from the data transceiver 104. In addition, the data transmission / reception antenna 105 receives a data signal transmitted from the receiver 200.

[0038] The receiver 200 includes, for example, a receiving antenna 201, a rectifier 202, a power management unit 203, a battery 204, a microcomputer 205, a data transceiver 206, and a data transmitting / receiving antenna 207. The receiving antenna 201, the rectifier 202, the power management unit 203, the battery 204, the microcomputer 205, the data transceiver 206, and the data transmitting / receiving antenna 207, or at least any combination of these, may be mounted on, for example, a PCB or an FPC (flexible printed circuit board).

[0039] The receiving antenna 201 is formed so as to be able to efficiently receive radio waves in the 920 MHz band, for example. The receiving antenna 201 receives the power supply signal radiated from the transmitting antenna 102.

[0040] The rectifier 202 rectifies the radio waves received as a power supply signal and converts them into a DC voltage.

[0041] The power management unit 203 manages the DC voltage. For example, the power management unit 203 controls a charging voltage based on the DC voltage. The power management unit 203 charges the battery 204 by controlling the charging voltage. In addition, for example, when the battery 204 stores power equal to or greater than a predetermined capacity, the power management unit 203 supplies the DC voltage to a connected member.

[0042] Furthermore, the power management unit 203 releases the power stored in the battery 204 under the control of the microcomputer 205 .

[0043] The battery 204 stores power in response to an instruction from the power management unit 203. The battery 204 also discharges the stored power in response to an instruction from the power management unit 203.

[0044] The microcomputer 205 controls the operation of the receiver 200. The microcomputer 205 is driven by a DC voltage supplied from the power management unit 203 or by power stored in the battery 204. The microcomputer 205 controls the power management unit 203 to cause the battery 204 to release the power stored therein.

[0045] For example, various sensors can be connected to the receiver 200. For example, a heat sensor, a temperature sensor, a light sensor, a humidity sensor, a vibration sensor, and the like are connected to the receiver 200. The sensors connected to the receiver 200 are driven by, for example, a direct current voltage supplied from the power management unit 203 or power discharged from the battery 204. The microcomputer 205 continuously or intermittently monitors the voltage value at a predetermined portion of the receiver 200, the status of the sensor connected to the receiver 200, information detected by the sensor, and the like. The microcomputer 205 transmits the voltage value at a predetermined portion of the receiver 200, the status of the sensor connected to the receiver 200, information detected by the sensor, and the like as digital data to the data transceiver 206. The sensor may be built into the receiver 200.

[0046] The data transceiver 206 performs processes such as analog conversion of digital data supplied from the microcomputer 205 and modulation of analog data. Further, the data transceiver 206 performs processes such as demodulation of a data signal received by the data transmission / reception antenna 207 and digitization of the demodulated data. The data transceiver 206 is driven by, for example, a DC voltage supplied from the power management unit 203 or the power discharged from the battery 204.

[0047] The data transmission / reception antenna 207 is formed, for example, so as to be able to efficiently transmit and receive radio waves in the 2.4 GHz band. The data transmission / reception antenna 207 radiates a data signal supplied from the data transceiver 206. Further, the data transmission / reception antenna 207 receives a data signal transmitted from the transmitter 100. For example, the data transmission / reception antenna 207 is driven by, for example, a DC voltage supplied from the power management unit 203 or the power discharged from the battery 204.

[0048] Also, in each of the above-described embodiments, the application to the so-called WPT system 1 in which transmission power composed of an AC signal is wirelessly transmitted from the transmitter 100 to the receiver 200 has been described. However, it is naturally possible to apply it to a system that provides power to the receiver 200 by other methods. Since such a system is known, detailed description is omitted. As an example, a system that sends power generated by solar power generation to the receiver 200 regardless of whether it is wired or wireless, and further, a system that sends power to the receiver 200 by laser light regardless of whether it is wired or wireless, etc. can be mentioned. In addition, a configuration in which vibration or sound is applied to the receiver 200 and the receiver 200 converts power such as vibration into electric power is also applicable. In addition, it is naturally applicable to a known non-contact power supply technology other than wirelessly receiving transmission power composed of an AC signal, for example, a system using a non-contact power supply technology based on a magnetic field coupling method.

[0049] <Operation of the WPT System 1> Hereinafter, each process of the WPT system 1 will be described.

[0050] The microcomputer 205 of the receiver 200 is capable of controlling radio waves of wireless communication according to the following first to third embodiments. The details of the wireless control will be described below. In this disclosure, a wireless signal (data signal) transmitted by the receiver 200 is disclosed as an example. Note that the present disclosure may be applied to a wireless signal (at least one of a power supply signal and a data signal) transmitted by the transmitter 100.

[0051] First Embodiment The multiple receivers 200 can perform wireless communication with the transmitter 100 by using different time-series radio wave intensities to suppress interference between the receivers 200 . Specifically, when transmitting a wireless signal, the receiver 200 can select one of five radio wave strength levels, Lv1, Lv2, Lv3, Lv4, and Lv5, and transmit the signal. For example, the radio wave strength levels Lv1, Lv2, Lv3, Lv4, and Lv5 correspond to radio wave strength levels of -10 dBm, -5 dBm, 0 dBm, +3 dBm, and +5 dBm, respectively. Note that the radio wave strength levels do not need to be limited to the above five levels, and may be divided into less than five levels or more than five levels.

[0052] The multiple receivers 200 are capable of performing wireless communication using time-series radio wave intensity patterns in which the strength of the transmitted radio waves for wireless communication differs from one another. Specifically, when transmitting a wireless signal, the receiver 200 transmits the wireless signal while changing the signal strength in a time series manner, for example, every predetermined period (1 ms). In this case, the sequence of radio wave strength levels arranged in time series, consisting of Lv1, Lv3, Lv5, Lv2, LV4, is called a radio wave strength pattern. The radio wave strength pattern may be a repeat of a sequence of a predetermined number of radio wave strength levels (a sequence of a finite length). It may also be a combination of a sequence of a predetermined number of radio wave strength levels. The radio wave intensity pattern may also be a sequence (an infinitely long sequence) of non-repeated radio wave intensity levels. In the present disclosure, each of the multiple receivers 200 transmits a wireless signal based on a different radio wave intensity pattern. Note that a different radio wave intensity pattern refers to a case where the radio wave intensity pattern is not common as a whole, and includes a case where the radio wave intensity pattern in a part of the period is common and the radio wave intensity pattern in another period is not common. As a result, even when wireless signals are transmitted from multiple receivers 200 using adjacent frequency bands, it is possible to ensure that communication between the transmitter 100 and a wireless signal transmitted from one receiver 200 with a high radio wave intensity level is successful. In addition, since wireless signals transmitted from other receivers 200 at different times may have a higher radio wave intensity level than a wireless signal transmitted from one receiver 200, it is possible to ensure that communication between the other receivers 200 and the transmitter 100 is successful. In other words, it is possible to avoid a situation in which all of the multiple receivers 200 are unable to communicate with the transmitter 100. This makes it possible to suppress interference between communication waves when communication is performed between a transmitter and a plurality of receivers.

[0053] Each of the multiple receivers 200 is capable of wireless communication using a radio wave intensity pattern that is a combination of consecutive radio wave intensity levels in a time series among three or more different radio wave intensity levels. Specifically, it is preferable that receiver 200 is configured to be able to select a predetermined radio wave intensity level from three or more levels of radio wave intensity, which can further suppress interference of communication radio waves when communication is performed between a transmitter and multiple receivers.

[0054] The multiple receivers 200 are capable of performing wireless communication with different time-series radio wave intensity patterns for each transmission slot of data communication in wireless communication. Specifically, when communicating with the transmitter 100, the receiver 200 performs wireless communication in communication slot units, which are time frames for transmitting and receiving data at regular intervals. Communication slots vary depending on the communication method and standard, and for example, in Bluetooth (registered trademark), they are often set in multiples of 1.25 ms, while in Wi-Fi, they are often set in multiples of 10 ms. In the present disclosure, receiver 200 assigns a communication slot to each element of the array of radio wave strength levels and transmits a radio signal. Receiver 200 transmits radio signals at radio wave strength levels of Lv1 in the first slot, Lv3 in the second slot, Lv5 in the third slot, Lv2 in the fourth slot, and Lv4 in the fifth slot. Note that receiver 200 may control the radio wave intensity level on a per-packet or per-frame basis, rather than on a per-slot basis, thereby making it possible to suppress interference with communication radio waves on a per-slot, per-packet, or per-frame basis.

[0055] The multiple receivers 200 are capable of wireless communication so as to suppress interference between the respective receivers by using different time-series radio wave intensity patterns according to the individual identification information assigned to each receiver 200. Specifically, receiver 200 selects a predetermined radio wave intensity pattern from among a plurality of radio wave intensity patterns according to the individual identification number assigned to itself, and transmits a wireless signal based on the time-series radio wave intensity according to the selected radio wave intensity pattern. For example, receiver 200 is assigned a predetermined individual identification number from 16 independent individual identification numbers from 0 to 15. For example, receiver 200 with individual identification number 0 transmits wireless signals with a radio wave intensity according to radio wave intensity pattern A. Receiver 200 with individual identification number 1 transmits wireless signals with a radio wave intensity according to radio wave intensity pattern B. Receiver 200 with individual identification number 1 transmits wireless signals with a radio wave intensity according to radio wave intensity pattern C. It is assumed that radio wave intensity patterns A, B, and C are each a different time-series radio wave intensity pattern. This makes it possible to suppress interference between communication waves when communication is performed between a transmitter and a plurality of receivers.

[0056] The individual identification numbers of the multiple receivers 200 are assigned by the transmitter 100 at the timing when the transmitter 100 and the multiple receivers 200 are connected for communication. Specifically, the individual identification number of the receiver 200 may be assigned by the transmitter 100 when wireless communication with the transmitter 100 is established (at the time of handshake). For example, the transmitter 100 assigns a unique individual identification number to each of the multiple receivers 200. In wireless communication, a handshake when establishing communication refers to signals exchanged between the transmitter 100 and receiver 200 before starting communication. This signal exchange carries out a procedure to enable both parties to communicate. Specifically, the transmitter 100 sends a signal to the receiver 200 saying that it "wants to start communication," and when the receiver 200 receives this signal, it returns a response signal. Upon receiving this response signal, the transmitter 100 determines that communication has been established and begins transmitting data. This handshake enables both parties to communicate, and data transmission and reception begins.

[0057] Second Embodiment The multiple receivers 200 perform wireless communication at radio wave strengths determined in accordance with independent probabilities for each receiver in a time series. The multiple receivers 200 may perform wireless communication at radio wave strengths that are random in a time series. Specifically, when transmitting a wireless signal, the receiver 200 probabilistically selects a predetermined radio wave intensity level from Lv1, Lv3, Lv5, Lv2, LV4, etc., for example, every predetermined period (1 ms), and transmits the wireless signal at the selected radio wave intensity level. For example, the probability of selection may be uniform (random) for all radio wave intensity levels, or there may be a bias in the probability of selection for each radio wave intensity level. For example, Lv1 may be selected less often. Note that, even in the second embodiment, the radio wave intensity level may be selected as a predetermined radio wave intensity level from three or more levels of radio wave intensity levels. The receiver 200 probabilistically selects a radio wave intensity level for each transmission slot of data communication in wireless communication, and transmits a wireless signal at the selected radio wave intensity level. The receiver 200 may control the radio wave intensity level not on a slot-by-slot basis, but on a packet-by-packet or frame-by-frame basis. Each of the multiple receivers 200 independently selects a radio wave intensity level for each receiver. This makes it possible to prevent the intensity levels of wireless signals selected by the multiple receivers 200 from overlapping. As a result, even when wireless signals are transmitted from multiple receivers 200 using adjacent frequency bands, it is possible to ensure that communication between the transmitter 100 and a wireless signal transmitted from one receiver 200 with a high radio wave intensity level is successful. In addition, since wireless signals transmitted from other receivers 200 at different times may have a higher radio wave intensity level than a wireless signal transmitted from one receiver 200, it is possible to ensure that communication between the other receivers 200 and the transmitter 100 is successful. In other words, it is possible to avoid a situation in which all of the multiple receivers 200 are unable to communicate with the transmitter 100. This makes it possible to suppress interference between communication waves when communication is performed between a transmitter and a plurality of receivers.

[0058] In the first embodiment, wireless communication may be performed using a single receiver 200 instead of a plurality of receivers 200, with radio wave strengths and radio wave strength patterns that differ over time. In the second embodiment, wireless communication may be performed at a radio wave strength determined according to an independent probability in a single receiver 200, instead of in multiple receivers 200. The single receiver 200 may perform wireless communication at a radio wave strength that is random in time series. As a result, even in the case of a single receiver 200, interference of communication radio waves with other wireless devices other than the WPT system 1 can be suppressed.

[0059] <Third embodiment> When communication with the transmitter 100 fails, the multiple receivers 200 execute control to transmit wireless signals to the transmitter with different radio wave intensities so as to suppress interference between the receivers 200. Specifically, the receiver 200 determines that communication with the transmitter 100 has failed when no appropriate response is received from the transmitter 100 in response to a wireless signal transmitted to the transmitter 100. Alternatively, the receiver 200 may determine that communication has failed when a predetermined condition is met, such as no response being received within a certain period of time after transmitting a wireless signal to the transmitter 100. Any condition can be set as the condition for communication failure. When it is determined that communication with the transmitter 100 has failed, the receiver 200 executes radio wave control for the wireless communication according to the first and second embodiments for a predetermined period. For example, the receiver 200 may execute radio wave control (interference suppression control) for the wireless communication according to the first and second embodiments for a predetermined period (interference suppression control implementation period). For receivers used in FA equipment, robot equipment, etc., which require high responsiveness, the interference suppression control period is preferably 1 millisecond to 50 milliseconds, and particularly 5 milliseconds to 50 milliseconds. For receivers used in monitoring sensors, the interference suppression control period may be several tens of milliseconds to about 1 second. In addition, when the first information processing device performs the interference suppression control over the interference suppression control period and the communication failure is not resolved, the first information processing device notifies a predetermined administrator of a message. For example, when the communication failure is not resolved over the interference suppression control period, the first information processing device notifies a message to an operator, worker, etc. of the production line on which the FA device and the robot device are installed. The notification may also be made by turning on a predetermined warning light, etc. This allows the production line operator to confirm that the receiver 200 is not communicating properly. Specifically, the production line operator can change the installation environment so that the receiver 200 can communicate properly. As a result, even if communication between the transmitter and the multiple receivers fails, re-interference during retry can be suppressed, and communication between the transmitter and the multiple receivers can be performed without delay. For example, if the multiple receivers 200 repeatedly retry with the same radio wave strength, their radio waves will interfere with each other, and all of the multiple receivers 200 will be unable to communicate with the transmitter 100.

[0060] When the multiple receivers 200 fail to communicate with the transmitter 100, they execute control to perform wireless communication with the transmitter at different radio wave strengths according to the number of failures. Specifically, when it is determined that communication with the transmitter 100 has failed, the receiver 200 counts the number of failures. When the number of failures reaches or exceeds a predetermined number, the receiver 200 executes radio wave control for wireless communication according to the first and second embodiments. Specifically, the receiver 200 selects a radio wave intensity pattern according to the number of failures by referring to a table or the like in which different radio wave intensity patterns are stored according to the number of failures. For example, the table stores pattern A, pattern B, and pattern C for the number of failures of 1, 2, and 3, respectively. Note that it is not necessarily necessary to use a table, and a configuration may be adopted in which a radio wave intensity pattern is selected according to the number of failures according to a predetermined rule. The receiver 200 may also be configured to select a radio wave intensity pattern with a higher priority than other receivers 200 as the number of failures increases. For example, the receiver 200 may be configured to select a radio wave intensity pattern with a higher average radio wave intensity level as the number of failures increases. The receiver 200 may also be configured to transmit a wireless signal at a random radio wave intensity with a high average radio wave intensity level. This allows a receiver 200 with a higher number of failures to be in a state where it is easier to communicate with the transmitter 100, and to be treated more favorably than other receivers 200. This is because it is often the case that a receiver 200 with a higher number of failures should be treated more favorably in wireless communication with the transmitter 100.

[0061] For example, the receiver 200 may execute radio wave control for wireless communication using different time-series radio wave intensity patterns depending on the number of failures. Specifically, the receiver 200 may select a predetermined radio wave intensity pattern from among a plurality of time-series radio wave intensity patterns depending on the number of failures, and execute radio wave control for wireless communication using the predetermined radio wave intensity pattern. For example, receiver 200 may execute radio wave control for wireless communication with radio wave strength determined according to different probability distributions depending on the number of failures. Specifically, receiver 200 may select a predetermined probability distribution from among a plurality of probability distributions depending on the number of failures, and execute radio wave control for wireless communication with radio wave strength determined according to the predetermined probability distribution. For example, the receiver 200 may execute radio wave control for wireless communication using different time-series radio wave intensity patterns according to individual identification information and the number of failures assigned to each receiver 200.

[0062] <Basic computer hardware configuration> 3 is a block diagram showing the basic hardware configuration of a computer 90. The computer 90 includes at least a processor 901, a main storage device 902, an auxiliary storage device 903, and a communication IF 991 (interface). These are electrically connected to each other by a communication bus 921.

[0063] The processor 901 is hardware for executing an instruction set described in a program, and is composed of an arithmetic unit, a register, a peripheral circuit, and the like.

[0064] The main memory device 902 is for temporarily storing programs, data to be processed by the programs, etc. For example, it is a volatile memory such as a DRAM (Dynamic Random Access Memory).

[0065] The auxiliary storage device 903 is a storage device for saving data and programs, such as a flash memory, a hard disk drive (HDD), a magneto-optical disk, a CD-ROM, a DVD-ROM, or a semiconductor memory.

[0066] The communication IF 991 is an interface for inputting and outputting signals for communicating with other computers via a network using a wired or wireless communication standard. The network is composed of the Internet, a LAN, various mobile communication systems constructed by wireless base stations, etc. For example, the network includes 3G, 4G, 5G mobile communication systems, LTE (Long Term Evolution), wireless networks that can connect to the Internet via a specified access point (e.g., Wi-Fi (registered trademark)), etc. In the case of wireless connection, communication protocols include, for example, Z-Wave (registered trademark), ZigBee (registered trademark), Bluetooth (registered trademark), etc. In the case of wired connection, the network also includes a network that is directly connected by a USB (Universal Serial Bus) cable or the like.

[0067] It should be noted that the computer 90 can be virtually realized by distributing all or part of each hardware configuration among multiple computers 90 and connecting them together via a network. In this way, the computer 90 is a concept that includes not only a computer 90 housed in a single housing or case, but also a virtualized computer system.

[0068] <Basic functional configuration of computer 90> A description will now be given of the functional configuration of a computer realized by the basic hardware configuration (FIG. 3) of computer 90. The computer comprises at least the functional units of a control unit, a storage unit, and a communication unit.

[0069] The functional units of the computer 90 can also be realized by distributing all or part of the functional units among multiple computers 90 connected to each other via a network. The computer 90 is a concept that includes not only a single computer 90 but also a virtualized computer system.

[0070] The control unit is realized by the processor 901 reading out various programs stored in the auxiliary storage device 903, expanding the programs in the main storage device 902, and executing processes according to the programs. The control unit can realize functional units that perform various information processing depending on the type of program. In this way, the computer is realized as an information processing device that performs information processing.

[0071] The storage unit is realized by a main storage device 902 and an auxiliary storage device 903. The storage unit stores data, various programs, and various databases. Furthermore, the processor 901 can secure a storage area corresponding to the storage unit in the main storage device 902 or the auxiliary storage device 903 in accordance with a program. Furthermore, the control unit can cause the processor 901 to execute processes of adding, updating, and deleting data stored in the storage unit in accordance with the various programs.

[0072] The term database refers to a relational database, which is used to manage sets of data called masters and tables in a tabular format structurally defined by rows and columns, by associating them with each other. In a database, a table is called a table or master, a column in a table is called a column, and a row in a table is called a record. In a relational database, relationships between tables and masters can be set and associated. Usually, a column that serves as a primary key for uniquely identifying a record is set in each table and each master, but setting a primary key in a column is not essential. The control unit can cause the processor 901 to add, delete, or update records in a specific table or master stored in the storage unit according to various programs. Furthermore, by storing data, various programs, and various databases in the storage unit, it can be considered that the information processing device and information processing system according to the present disclosure have been manufactured.

[0073] In addition, the database and master in this disclosure may include any data structure (such as a list, a dictionary, an associative array, or an object) in which information is structurally defined. The data structure also includes data that can be considered as a data structure by combining data with a function, class, method, or the like written in any programming language.

[0074] The communication unit is realized by the communication IF 991. The communication unit realizes a function of communicating with other computers 90 via a network. The communication unit can receive information transmitted from other computers 90 and input the information to the control unit. The control unit can cause the processor 901 to execute information processing on the received information in accordance with various programs. In addition, the communication unit can transmit information output from the control unit to other computers 90.

[0075] <Additional Notes> The matters described in the above embodiments will be supplemented below.

[0076] (Appendix 1) A wireless power supply system comprising at least one transmitter and multiple receivers, wherein the transmitter (100) is capable of wirelessly supplying power to the multiple receivers, and the multiple receivers (200) are capable of wirelessly communicating with the transmitter so as to suppress interference between the respective receivers by using different time-series radio wave strengths. This makes it possible to suppress interference between communication waves when communication is performed between a transmitter and a plurality of receivers.

[0077] (Appendix 2) 2. The wireless power supply system according to claim 1, wherein the plurality of receivers (200) are capable of transmitting sensing data acquired by sensing devices included in the receivers to the transmitter via wireless communication. This enables the transmitter to obtain data sensed by a sensing device such as a sensor equipped in the receiver with low latency by suppressing interference from communication radio waves.

[0078] (Appendix 3) 3. The wireless power supply system according to claim 1, wherein the plurality of receivers (200) are capable of wireless communication using different time-series radio wave intensity patterns. This makes it possible to more reliably suppress interference between communication waves when communication is performed between a transmitter and a plurality of receivers.

[0079] (Appendix 4) A wireless power supply system according to any one of appendices 1 to 3, wherein the multiple receivers (200) are capable of wireless communication using a radio wave intensity pattern consisting of a time-series consecutive combination of predetermined radio wave intensity levels among three or more different radio wave intensity levels. This makes it possible to more reliably suppress interference between communication waves when communication is performed between a transmitter and a plurality of receivers.

[0080] (Appendix 5) 5. The wireless power supply system according to claim 1, wherein the plurality of receivers (200) are capable of performing wireless communication with different time-series radio wave intensity patterns for each transmission slot of data communication in the wireless communication. This makes it possible to suppress interference between communication radio waves on a communication slot-by-communication-slot basis when communication is performed between a transmitter and a plurality of receivers.

[0081] (Appendix 6) A wireless power supply system according to any one of appendices 1 to 5, wherein a plurality of receivers (200) are capable of wireless communication so as to suppress interference between the receivers by using different time-series radio wave intensity patterns corresponding to individual identification information assigned to each receiver. This makes it possible to suppress interference between communication waves when communication is performed between a transmitter and a plurality of receivers.

[0082] (Appendix 7) 7. The wireless power transfer system according to claim 6, wherein individual identification numbers of the multiple receivers are assigned by the transmitter at the time when a communication connection is established between the transmitter and the multiple receivers. This allows wireless communication to be performed according to the individual identification number assigned to the receiver when a communication connection is established between the transmitter and the receiver. When communication is performed between a transmitter and multiple receivers, interference of communication waves can be suppressed.

[0083] (Appendix 8) 3. The wireless power supply system according to claim 1, wherein the plurality of receivers (200) are capable of wireless communication at radio wave strengths determined in accordance with independent probabilities for each receiver in a time series manner. This makes it possible to suppress interference between communication waves when communication is performed between a transmitter and a plurality of receivers.

[0084] (Appendix 9) 9. The wireless power supply system according to claim 8, wherein the plurality of receivers (200) are capable of wireless communication with each other at a time-series random radio wave intensity. This makes it possible to suppress interference between communication waves when communication is performed between a transmitter and a plurality of receivers.

[0085] (Appendix 10) A wireless power supply system according to any one of appendices 1 to 9, wherein, when communication with the transmitter fails, the multiple receivers (200) execute control to perform wireless communication with the transmitter at different radio wave intensities so as to suppress interference between each receiver. As a result, even if communication between a transmitter and multiple receivers fails, re-interference during a retry can be suppressed, and communication between the transmitter and multiple receivers can be performed without delay.

[0086] (Appendix 11) The wireless power supply system according to claim 10, wherein, when communication with the transmitter fails, the receivers (200) execute control to wirelessly communicate with the transmitter at different radio wave intensities according to the number of failures. As a result, even if communication between a transmitter and multiple receivers fails, re-interference during a retry can be suppressed, and communication between the transmitter and multiple receivers can be performed without delay.

[0087] (Appendix 12) The wireless power supply system according to claim 11, wherein, when communication with the transmitter fails, the receivers (200) execute control to perform wireless communication at a higher average radio wave strength as the number of failures increases. As a result, the receiver 200 with a larger number of failures is more likely to communicate with the transmitter 100, and can be given preferential treatment compared to other receivers 200.

[0088] (Appendix 13) A wireless power supply system as described in Appendix 10, wherein, when communication with the transmitter fails, the multiple receivers (200) execute control for a predetermined period of time to wirelessly communicate with the transmitter at different radio wave strengths so as to suppress interference between each receiver, and when the communication failure with the transmitter is not resolved within the predetermined period of time, a notification is given to a predetermined administrator. This allows the production line operator to confirm that receiver 200 is not communicating properly.

[0089] (Appendix 14) 14. A wireless power supply system according to any one of claims 1 to 13, which is used for transmitting and receiving wireless power to an FA or robotic device. It is possible to establish low-latency wireless communication while suppressing interference between the transmitter and receiver. This makes it possible to control factory automation (FA) and robotic devices with low latency in technical fields that require real-time performance, such as the control of FA and robotic devices. [Explanation of symbols]

[0090] 1 WPT system, 300 first information processing device, 3001 storage unit, 3004 control unit, 3006 input device, 3008 output device, 400 second information processing device, 4001 storage unit, 4004 control unit, 4006 input device, 4008 output device, 100 transmitter, 200 receiver

Claims

[Claim 1] In a wireless power supply system consisting of at least one transmitter and multiple receivers, The transmitter is capable of wirelessly supplying power to the plurality of receivers. The plurality of receivers can communicate wirelessly to the transmitter in such a way that interference between each receiver is suppressed by using different time-series radio wave strengths. Wireless power supply system.

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