Power transmission device, power reception device, power transmission control method, power transmission control program, power reception control method, and power reception control program

Abstract

A control section controls a power transmission section that performs wireless power transmission. The control section includes a unit that causes the power transmission section to radiate a first power transmission beam having a first power set therein; a unit that acquires feedback information regarding a reception result of the first power transmission beam in a power receiving device; a unit that determines a power receiving capability in the power receiving device; and a unit that refers to the power receiving capability and the reception result to determine a second power that is greater than the first power and can be used in wireless power supply to the power receiving device, wherein the power receiving capability includes a maximum value of an input power range of the power receiving device, and the wireless power transmission uses electromagnetic waves having a frequency of microwaves or higher.

Description

Technical Field

[0001] This disclosure relates to a power transmission device, a power receiving device, a power transmission control method, a power transmission control program, a power receiving control method, and a power receiving control program. Background Technology

[0002] In the field of wireless power supply, high-efficiency power transmission is required.

[0003] Patent Document 1 describes a method of using the backscattered signal of a mobile device to change the phase of each transmission element of an RF transmitter array in order to maximize the RF signal supplied for charging the mobile device.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: U.S. Patent Application Publication No. 2019 / 0214855 Summary of the Invention

[0007] The problem the invention aims to solve

[0008] In theory, increasing the power transmitted to the receiving device should allow it to be charged sooner. However, real-world receiving devices have limitations in their power receiving capacity. For example, if the power received exceeds the receiving device's capacity, it may experience various adverse effects such as performance degradation, deterioration, or damage.

[0009] The purpose of this disclosure is to control and achieve high-efficiency power transmission in a manner that the power of the power transmission beam is set to not exceed the power receiving capacity of the power receiving device.

[0010] Solution for solving the problem

[0011] One aspect of the power transmission device disclosed herein includes a control unit for controlling a power transmission unit that performs wireless power transmission. The control unit includes: a unit for causing the power transmission unit to radiate a first power transmission beam with a first power set; a unit for acquiring feedback information related to the reception result of the first power transmission beam in a power receiving device; a unit for determining the power receiving capability in the power receiving device; and a unit for determining a second power that is greater than the first power and can be used in wireless power supply targeting the power receiving device, based on the power receiving capability and the reception result. The power receiving capability includes the maximum value of the input power range of the power receiving device, and the wireless power transmission uses electromagnetic waves with frequencies higher than microwave.

[0012] The effects of the invention

[0013] According to this disclosure, it is possible to control and achieve high-efficiency power transmission in such a way that the power of the power transmission beam is set to not exceed the power receiving capacity of the power receiving device. Attached Figure Description

[0014] Figure 1 This is a block diagram illustrating the structure of the wireless power supply system according to this embodiment.

[0015] Figure 2 This is a block diagram illustrating the structure of a power transmission device.

[0016] Figure 3 This is an example and Figure 2 The diagram shows the power transmission surface corresponding to the power transmission section.

[0017] Figure 4 This is a block diagram illustrating the structure of a power receiving device.

[0018] Figure 5 This is an example and Figure 4 A diagram of the receiving surface corresponding to the receiving part.

[0019] Figure 6 This is an example Figure 4 A diagram showing the circuit structure of the power receiving module in the power receiving section.

[0020] Figure 7 This is an example Figure 6 A graph showing the relationship between the received power of the receiving module and the reference voltage detected by the receiving module.

[0021] Figure 8 This is a diagram illustrating the data structure of the power receiving level database in this embodiment.

[0022] Figure 9 This is a diagram illustrating the overall flow of the wireless power supply process in this embodiment.

[0023] Figure 10 This is an explanatory diagram related to determining the power supply capacity.

[0024] Figure 11 This is an explanatory diagram related to determining the power supply capacity.

[0025] Figure 12 This is an explanatory diagram related to determining the power supply capacity.

[0026] Figure 13 This is a diagram showing the overall flow of the wireless power supply process in Modification 1.

[0027] Figure 14 This is a diagram showing the overall flow of the wireless power supply process in Modification Example 2.

[0028] Figure 15This is a diagram illustrating the circuit structure of a power receiving module that does not have a detection function.

[0029] Figure 16 It is a graph obtained by plotting the efficiency with respect to input power.

[0030] Figure 17 This is a summary illustration of variation 4.

[0031] Figure 18 This is a flowchart illustrating the power supply control process of variation example 4.

[0032] Figure 19 This is an example Figure 18 The flowchart details step S210.

[0033] Figure 20 This is a diagram illustrating the structure of information received by the power transmitting device from the power receiving device.

[0034] Figure 21 This is an example Figure 18 The flowchart details step S220.

[0035] Figure 22 This is a diagram illustrating an ideal beam shape.

[0036] Figure 23 This is a diagram illustrating an ideal beam shape.

[0037] Figure 24 This is a flowchart illustrating the power supply control process of variation 5.

[0038] Figure 25 This diagram illustrates the control of the power transmission beam when the orientation of the receiving surface changes.

[0039] Figure 26 This is a diagram illustrating the data structure of the power receiving section database in Example 6.

[0040] Figure 27 This is an illustration of distance measurement technology using a single-lens reflex camera.

[0041] Figure 28 This is an illustration of distance measurement technology using a single-lens reflex camera.

[0042] Figure 29 This is an explanatory diagram illustrating the method for determining the power ratio when the power receiving section has multiple power receiving modules.

[0043] Figure 30 This is an explanatory diagram illustrating the method for determining the power ratio when the power receiving section has multiple power receiving modules. Detailed Implementation

[0044] Hereinafter, an embodiment of the present invention will be described in detail based on the accompanying drawings. Furthermore, in the drawings used to illustrate the embodiment, the same reference numerals are used to label the same structural elements, and repeated descriptions are omitted.

[0045] (1) Structure of wireless power supply system

[0046] Describe the structure of the wireless power supply system. Figure 1 This is a block diagram illustrating the structure of the wireless power supply system according to this embodiment.

[0047] like Figure 1 As shown, the wireless power supply system 1 includes a power supply device 10 and a power receiving device 30.

[0048] The power transmitting device 10 and the power receiving device 30 are capable of wireless communication with each other. The method of wireless communication is arbitrary, but may include, for example, Bluetooth (registered trademark), ZigBee (registered trademark), certain low-power wireless communication, or wireless LAN (Local Area Network).

[0049] In response to a power supply request from the power receiving device 30, the power transmitting device 10 wirelessly supplies power to the power receiving device 30.

[0050] Specifically, before the power transmission beam (an example of a second power transmission beam) with a power supply setting ("second power") begins to radiate (that is, before formal wireless power supply begins), the power transmission device 10 and the power receiving device 30 operate as follows.

[0051] The power transmission device 10 radiates a power transmission beam (hereinafter also referred to as a "test beam") (an example of a "first power transmission beam") with a power level ("first power") lower than the power supply power (i.e., a low power level) toward the power receiving device 30.

[0052] The receiving device 30 sends feedback information related to its own power receiving capability and the reception results of the test beam to the power transmitting device 10.

[0053] The power supply device 10 determines the power supply capacity (that is, the power that can be used for wireless power supply to the receiving device 30) by referring to the feedback information.

[0054] The receiving device 30 has a battery (not shown). The receiving device 30 sends a power request to the transmitting device 10 and uses the energy of the transmission beam radiated from the transmitting device 10 to charge the battery.

[0055] The powered device 30 is any battery-powered electronic device. As an example, the powered device 30 is a mobile computer (such as a smartphone, tablet, or laptop), a display for picking operations in a warehouse, or a drone.

[0056] In addition, Figure 1 In this device, the number of power transmission device 10 and power receiving device 30 is one, but the number of power transmission device 10 and power receiving device 30 is not limited to one.

[0057] In the presence of multiple powered devices 30, each powered device 30 may include information for self-identification in its power supply request. Thus, the power supply device 10 is able to identify the powered device 30 (target powered device) that is the object of wireless power supply.

[0058] In the presence of multiple power supply devices 10, multiple power supply devices 10 may cooperate to provide wireless power, or only one of these power supply devices 10 may provide wireless power. The power supply device 10 providing wireless power may be designated by the target power receiving device, or it may be determined by one or more power supply devices 10 that receive a power supply request from the target power receiving device.

[0059] (1-1) Structure of the power transmission device

[0060] Explain the structure of the power transmission device 10. Figure 2 This is a block diagram illustrating the structure of a power transmission device. Figure 3 This is an example and Figure 2 The diagram shows the power transmission surface corresponding to the power transmission section.

[0061] like Figure 2 As shown, the power supply device 10 includes a storage device 11, a processor 12, an input / output interface 13, a communication interface 14, and a power supply unit 15. The power supply device 10 can be connected to at least one of the input device 16 and the output device 17.

[0062] Storage device 11 is configured to store programs and data. Storage device 11 is, for example, a combination of ROM (Read Only Memory), RAM (Random Access Memory), and storage devices (such as flash memory or hard disk).

[0063] The program may include, for example, the following programs.

[0064] OS (Operating System) programs

[0065] • Programs used for applications that perform information processing (such as power transmission control processing)

[0066] The data may include, for example, the following.

[0067] Databases referenced in information processing

[0068] • Data obtained through information processing (i.e., the results of information processing).

[0069] The processor 12 is configured to perform the functions of the power supply device 10 (especially the functions of controlling the power supply unit 15) by activating the program stored in the storage device 11. The processor 12 is an example of a computer or control unit.

[0070] The input / output interface 13 is configured to acquire signals (e.g., user instructions, sensing data, or a combination thereof) from the input device 16 connected to the power supply device 10, and output signals to the output device 17 connected to the power supply device 10.

[0071] Input device 16 is, for example, a keyboard, an indicator device, a touch screen, a sensor (e.g., an optical sensor), or a combination thereof.

[0072] Optical sensors can include, for example, at least one of the following.

[0073] Camera

[0074] Lidar (Light Detection and Ranging)

[0075] • ToF (Time of Flight) camera

[0076] Output device 17 is, for example, a display, a speaker, an alarm device, or a combination thereof. When the alarm device receives an alarm output instruction from the power supply device 10, it outputs an alarm perceptible to people in the vicinity. As an example, the alarm is not limited to human vision or hearing; it stimulates the senses of touch, smell, or taste to make the operator aware of at least one of the presence of the alarm itself and the content of the alarm. Alarm devices include, for example, light sources, lamps, displays, projectors, electrically controllable machinery (e.g., electric gates for obstructing passage), smoke devices, speakers, vibration devices, fog generating devices, odor generating devices, taste stimulating devices (e.g., devices with an interface tube capable of supplying taste stimulating liquid to the wearer's tongue), or combinations thereof.

[0077] The communication interface 14 is configured to control communication between the power supply device 10 and an external device (e.g., the power receiving device 30).

[0078] As an example, communication interface 14 is a wireless communication module that supports at least one of Bluetooth, ZigBee, certain low-power wireless communication and wireless LAN.

[0079] The power transmission unit 15 is configured to radiate power supply electromagnetic waves as a power transmission beam (i.e., to wirelessly transmit power) according to control signals from the processor 12. The power supply electromagnetic waves are, for example, microwaves or light waves (laser or LED light). In the following description, the power supply electromagnetic waves are assumed to be microwaves.

[0080] Specifically, the power transmission unit 15 includes a signal source, signal processing circuitry, and an antenna (an example of a "beam radiating element").

[0081] The signal source is, for example, an oscillator used to generate electromagnetic waves for power supply.

[0082] The signal processing circuit processes the electromagnetic waves generated by the signal source, including, for example, at least one of phase adjustment, amplitude adjustment, and filtering. The signal processing circuit may include an amplifier for amplitude adjustment (power amplification).

[0083] The antenna radiates electromagnetic waves, powered by the signal processing circuitry, into space as a transmission beam. Lights, serving as alarm devices, can also be installed around the antenna. For example, turning on the lights can alert those nearby that wireless power transmission is in progress.

[0084] like Figure 3 As shown, the power transmission unit 15 includes multiple antennas 151. The antennas 151 can be... Figure 3 Such a planar antenna can also be a linear antenna. Furthermore, antenna 151 can be configured as follows: Figure 3 Such an array can also be configured in different ways.

[0085] Multiple antennas 151 form a power transmission surface. The power transmission surface corresponds to the portion of the power transmission unit 15 that radiates the power transmission beam. The power transmission surface depends on the structure of the power transmission unit 15 (e.g., the size, shape, arrangement, and number of antennas 151). As an example, it can be determined as follows: Figure 3 That includes the rectangular power transmission surface TS of all the antennas 151 of the power transmission unit 15.

[0086] (1-2) Structure of the power receiving device

[0087] Explain the structure of the power receiving device 30. Figure 4 This is a block diagram illustrating the structure of a power receiving device. Figure 5 This is an example and Figure 4 A diagram of the receiving surface corresponding to the receiving part. Figure 6 This is an example Figure 4 A diagram showing the circuit structure of the power receiving module in the power receiving section. Figure 7 This is an example Figure 6 A graph showing the relationship between the received power of the receiving module and the reference voltage detected by the receiving module.

[0088] like Figure 4 As shown, the powered device 30 includes a storage device 31, a processor 32, an input / output interface 33, a communication interface 34, and a powered receiving unit 35. The powered device 30 can be connected to at least one of the input device 36 and the output device 37.

[0089] Storage device 31 is configured to store programs and data. Storage device 31 is, for example, a combination of ROM, RAM, and storage devices (such as flash memory or hard disk).

[0090] The program may include, for example, the following programs.

[0091] OS programs

[0092] Programs used for performing information processing applications

[0093] The data may include, for example, the following.

[0094] Databases referenced in information processing

[0095] ·Execution results of information processing

[0096] The processor 32 is configured to perform the functions of the powered device 30 (particularly the function of controlling the powered unit 35) by activating the program stored in the storage device 31. The processor 32 is an example of a computer or control unit.

[0097] The input / output interface 33 is configured to acquire signals (such as user instructions, sensed data, or a combination thereof) from the input device 36 connected to the powered device 30. Additionally, the input / output interface 33 is configured to output signals to the output device connected to the powered device 30.

[0098] Input device 36 is, for example, a keyboard, an indicator device, a touch screen, a sensor (e.g., a gesture sensor), or a combination thereof.

[0099] An attitude sensor may include, for example, at least one of the following.

[0100] • Accelerometer

[0101] Angular velocity sensor

[0102] Magnetic sensor

[0103] Output device 37 is, for example, a display.

[0104] The communication interface 34 is configured to control communication between the powered device 30 and an external device (e.g., the power supply device 10). As an example, the communication interface 34 sends sensing data to the external device.

[0105] As an example, communication interface 34 is a wireless communication module that supports at least one of Bluetooth, ZigBee, certain low-power wireless communication and wireless LAN.

[0106] The receiving unit 35 is configured to receive the power beam radiated into space by the power transmitting unit 15 to obtain power.

[0107] Specifically, the power receiving unit 35 includes an antenna and a power converter.

[0108] The antenna receives electromagnetic waves (power transmission beams) propagating in space for power supply.

[0109] The power converter converts the electromagnetic waves received by the antenna into (DC) power.

[0110] When the electromagnetic wave used for power supply is microwave, the antenna and power converter can also be a rectifier antenna (an example of a "power receiving module"). When the electromagnetic wave used for power supply is light, the antenna and power converter can also be a photoelectric converter (an example of a "power receiving module").

[0111] like Figure 5 As shown, the power receiving unit 35 includes multiple antennas 351. The antennas 351 can be... Figure 5 Such a planar antenna can also be a linear antenna. Furthermore, antenna 351 can be configured as follows: Figure 5 Such an array can also be configured in different ways.

[0112] Multiple antennas 351 form a receiving surface (also called an opening). The receiving surface corresponds to the portion of the receiving section 35 that receives the transmitted power beam. The receiving surface depends on the structure of the receiving section 35 (e.g., the size, shape, arrangement, and number of antennas 351). As an example, it can be determined as follows: Figure 5 That includes the rectangular receiving surface RS of all the antennas 351 provided by the receiving unit 35. The receiving surface can also be an effective opening surface based on the electrical wave characteristics of the receiving unit 35.

[0113] like Figure 6 As shown, the power receiving module included in the power receiving section 35 includes an antenna 351, a diode D, a capacitor C, a switch SW, and a resistor R.

[0114] The anode of diode D is grounded, and the cathode of diode D is connected to antenna 351, the first terminal of capacitor 351, and the input terminal of switch SW. The first terminal of capacitor C is connected to antenna 351, the cathode of diode D, and the input terminal of switch SW, and the second terminal of capacitor C is grounded. Diode D and capacitor C convert (i.e., rectify) the alternating current output from antenna 351 receiving the transmitted beam into direct current.

[0115] The switch SW has one input terminal and two output terminals. The input terminal of the switch SW is connected to the antenna 351, the cathode of the diode D, and the first terminal of the capacitor C. The first output terminal of the switch SW is connected to node N0. The second output terminal of the switch SW is connected to node N1 and one end of the resistor R.

[0116] In response to a control signal (not shown), switch SW short-circuits the input terminal with either the first output terminal or the second output terminal.

[0117] Specifically, during wireless power supply (i.e., when the power beam with the set power supply is being radiated), switch SW short-circuits the input terminal and the first output terminal (first switch state). As a result, the DC current obtained by diode D and capacitor C is directed to a battery (not shown) via node N0. Any circuit structure may exist between node N0 and the battery, or no circuit structure may be present.

[0118] Additionally, during detection, switch SW short-circuits the input terminal and the second output terminal (second switch state). Consequently, the DC current obtained from diode D and capacitor C is directed to resistor R.

[0119] One end of resistor R is connected to node N1 and the second output terminal of switch SW, and the other end of resistor R is connected to node N2 (ground). When switch SW is in the second switching state, DC current flows through switch SW to resistor R. This generates a reference voltage Vref between the two ends of resistor R (i.e., nodes N1 and N2). Figure 7 As shown, the reference voltage Vref depends on the received power Prf of the powered module. Therefore, an estimated value of the received power Prf can be derived by determining the received power Prf corresponding to the detected reference voltage Vref.

[0120] The power receiving device 30 includes a battery (not shown). The battery supplies power to various parts of the power receiving device 30. The power obtained by the power receiving unit 35 charges the battery.

[0121] (2) Database

[0122] The database of this embodiment is described below. The following database is stored in at least one of storage device 11 and storage device 31.

[0123] (2-1) Power Receiving Level Database

[0124] This describes the power receiving level database for this implementation method. Figure 8 This diagram illustrates the data structure of the power receiving level database according to this embodiment. The power receiving level database is stored in at least one of storage device 11 and storage device 31.

[0125] like Figure 8 As shown, the power rating database includes fields for "Rating", "Input Power Range", "Output Power Range", "Frequency", and "Antenna Structure". These fields are interconnected.

[0126] The power receiving level database stores power receiving level information (an example of "information related to power receiving capability"). Power receiving level information is information related to power receiving level. Power receiving level is a concept derived by categorizing the power receiving capabilities that the power receiving parts of various power receiving devices can possess.

[0127] The power receiving capability includes, for example, at least one of the following.

[0128] • Dimensions of the receiving surface

[0129] • Shape of the receiving surface

[0130] • The power range that the receiving part 35 can receive

[0131] • The frequency that the power receiving unit 35 can receive

[0132] Types of polarized waves that can be received by the power receiving unit 35

[0133] The "Level" field stores level information. Level information is used to identify the level.

[0134] The power receiving device 30 stores level information in its storage device 31, which indicates the power receiving level of the power receiving section 35 of the power receiving device 30.

[0135] The "Input Power Range" field stores input power range information. This information defines the input power range (e.g., minimum and maximum values). For example, the input power range might be the recommended input power range for the power receiving module included in the power receiving unit 35. The input power range can be determined by referring to the efficiency characteristics of the power receiving module (e.g., the relationship between input power and efficiency). In this case, the input power range refers to the range of received power that allows the power receiving module to operate safely and efficiently.

[0136] The "Output Power Range" field stores the output power range information. This information defines the output power range (e.g., minimum and maximum values). The output power range is the range of output power when the powered module is supplied with a receive voltage within the input power range.

[0137] The frequency information is stored in the "Frequency" field. The frequency information is related to the frequency of the electromagnetic waves used for power supply that the power receiving unit 35 can receive.

[0138] The antenna structure information is stored in the "Antenna Structure" field. The antenna structure information is related to the structure of the antenna 351 provided by the power receiving unit 35.

[0139] As an example, the "Antenna Structure" field includes a "Spacing" field, a "Number of Components" field, and a "Configuration" field.

[0140] The antenna spacing information is stored in the "Spacing" field. The antenna spacing information is related to the spacing between adjacent antennas 351 of the receiving unit 35.

[0141] The "Number of Components" field stores information about the number of antenna components. This information relates to the number of antennas 351 present in the power receiving unit 35.

[0142] The antenna configuration information is stored in the "Configuration" field. The antenna configuration information is related to the overall configuration of the multiple antennas 351 provided by the power receiving unit 35.

[0143] (2-2) Received power database

[0144] The received power database of this embodiment is described. The received power database is stored in at least one of storage device 11 and storage device 31.

[0145] As described above, in the power receiving module of the power receiving device 30, there is a correspondence between the reference voltage Vref and the received power Prf. A received power database (not shown) describing this correspondence can be used to determine the received power Prf corresponding to the reference voltage Vref. The value of the corresponding received power Prf can be determined by searching the received power database using the value of the reference voltage Vref as a keyword.

[0146] (3) Wireless power supply processing

[0147] This describes the wireless power supply process in this embodiment. Figure 9 This is a diagram illustrating the overall flow of the wireless power supply process in this embodiment. Figure 10 This is an explanatory diagram related to determining the power supply capacity. Figure 11 This is an explanatory diagram related to determining the power supply capacity. Figure 12 This is an explanatory diagram related to determining the power supply capacity.

[0148] like Figure 9 As shown, the power supply device 10 executes the radiation test beam (S110).

[0149] Specifically, the processor 12 causes the power supply unit 15 to radiate a test beam toward the power receiving device 30.

[0150] As described above, the power set for the test beam is weaker than the power supplied. This suppresses the received power of the test beam in the power receiving device 30, thus avoiding adverse situations caused by the received power exceeding the power receiving capacity of the power receiving device 30 (e.g., the maximum value of the input power range).

[0151] As an example, the processor 12 may also set the minimum value of a settable power range (e.g., the power when the gain of a power amplifier (not shown) is set to 0 [dB]) to the test beam. Furthermore, the processor 12 may also set the power of the test beam to be variable based on power supply conditions (e.g., the position or orientation of the powered device 30, or the presence or absence of obstacles).

[0152] After step S110, the power receiving device 30 performs a detection reference voltage (S130).

[0153] Specifically, the power receiving module ( ) of the power receiving unit 35 Figure 6 The processor 32 receives the test beam radiated in step S110. While receiving the test beam, the switch SW of the power receiving module is set to the second switching state. Therefore, a reference voltage Vref is generated between nodes N1 and N2 of the power receiving module. The processor 32 reads the value of the generated reference voltage Vref.

[0154] After step S130, the powered device 30 performs the sending of feedback information (S131).

[0155] Specifically, the processor 32 sends feedback information related to the reception results of the test beam in the power receiving unit 35 and the power receiving capability of the power receiving unit 35 to the power transmitting device 10 via the communication interface 34.

[0156] As an example, the processor 32 sends feedback information to the power supply device 10, which includes information representing the reference voltage Vref detected in step S130 (an example of "information related to the reception result").

[0157] When the power receiving device 30 has multiple power receiving modules, the reference voltage is detected for each power receiving module. The processor 32 can send feedback information containing information representing all the detected values ​​of the multiple power receiving modules to the power transmitting device 10, or it can send feedback information containing information representing a portion of the detected values ​​(e.g., only the maximum value or only the minimum and maximum values) to the power transmitting device 10.

[0158] In step S131, the processor 32 may also send feedback information containing information related to the power receiving capability of the power receiving device 30 (such as level information or input power range information) to the power transmitting device 10.

[0159] Furthermore, the receiving device 30 can also transmit information related to its power receiving capability to the power transmitting device 10 at a different time than in step S131. For example, the receiving device 30 can also start at... Figure 9 Before wireless power supply processing, information related to power receiving capability is sent to the power transmitting device 10. In this case, the information related to power receiving capability can be included in the power supply request.

[0160] After step S131, the power supply device 10 performs the process of deriving the estimated received power (S111).

[0161] Specifically, processor 12 determines the value of the reference voltage detected in step S130 by referring to the feedback information sent in step S131. Processor 12 then refers to a received power database to determine the value of the received power corresponding to the reference voltage. Thus, processor 12 derives the estimated received power (i.e., the estimated value of Prf) corresponding to the reference voltage.

[0162] Furthermore, if the feedback information sent in step S131 includes information representing the reference voltages in multiple power receiving modules, the processor 12 can derive the estimated received power individually for all reference voltages, or it can derive the estimated received power individually for a portion of the reference voltages (e.g., only the maximum value or only the minimum and maximum values).

[0163] After step S111, the power supply device 10 performs the determination of the power supply (S112).

[0164] Specifically, the processor 12 determines the power supply by referring to the estimated received power derived in step S111 and information related to the power receiving capability of the powered device 30.

[0165] As an example, the processor 12 determines the maximum value Pmax and minimum value Pmin of the input power range of the powered device 30 by referring to information related to the power receiving capability. The processor 12 calculates the power ratios (Pmax / Pest and Pmin / Pest) of the maximum value Pmax and the minimum value Pmin relative to the estimated received power (Pest).

[0166] The processor 12 compares the power ratio range (Pmax / Pest to Pmin / Pest) with the settable gain range (Gmax to Gmin). Here, gain represents the power ratio of the power supplied to the test beam relative to the power set for the test beam. That is, if the gain of the power amplifier when radiating the test beam is set to 0 [dB], the gain range corresponds to the dynamic range of the power amplifier. Gmax represents the maximum gain. Gmin represents the minimum gain. In other words, if the power set for the test beam is Pt, the minimum power supplied is Gmin × Pt, and the maximum power supplied is Gmax × Pt.

[0167] like Figure 10 As shown, when there is an overlap between the power ratio range (Pmax / Pest ~ Pmin / Pest) and the gain range (Gmax ~ Gmin) (hereinafter referred to as the "recommended power supply range"), i.e., when Pmax / Pest ≥ Gmax ≥ Pmin / Pest or Pmax / Pest ≥ Gmin ≥ Pmin / Pest is true, the processor 12 determines a gain (Gopt) from the recommended power supply range. Thus, the power supply power is determined to be Gopt × Pt. When the power transmission unit 15 radiates a power transmission beam with such a power supply power, the received power in the receiving device 30 is expected to converge within the input power range of the receiving device 30, thereby enabling efficient power transmission. In particular, the received power in the receiving device 30 is expected not to exceed the maximum value of the input power range of the receiving device 30, thus enabling the receiving device 30 to operate safely.

[0168] As an example, GOPt can be determined as the maximum gain within the recommended power supply range, or it can be determined as the gain obtained by multiplying that gain by a specified ratio (e.g., 0.9).

[0169] After step S112, the processor 12 may also perform at least one of the following processes.

[0170] • Report to the power receiving device 30 or the user that it is able to supply power to the power receiving device 30.

[0171] • Waiting for a power supply start request from the power receiving device 30.

[0172] • The power supply beam, which is set with the power supply power determined in step S112, is radiated toward the power receiving device 30 (that is, power supply is started).

[0173] • It is highly efficient to notify the user or the powered device 30 to supply power to the powered device 30.

[0174] On the other hand, due to the distance between the power supply device 10 and the power receiving device 30 or other main reasons, it is possible that a recommended power supply range does not exist. In this case, the power supply device 10 can perform the error handling illustrated below.

[0175] like Figure 11 As shown, when Gmin>Pmax / Pest holds true, it is difficult to safely and efficiently supply power to the receiving device 30 since even minimizing the power supply exceeds the maximum value Pmax of the input power range.

[0176] Therefore, processor 12 can also perform at least one of the following processes.

[0177] • Notify the user, the power receiving device 30, or the movable mechanism of the power receiving device 30 to move the power receiving device 30 away from the power supply device 10.

[0178] • Report to the power receiving device 30 or the user that power cannot be supplied to the power receiving device 30.

[0179] • Notify the user, the power receiving device 30, or a movable mechanism of the power receiving device 30 (e.g., a robotic arm) that the power receiving surface of the power receiving device 30 is not parallel to the power supply surface of the power supply device 10.

[0180] • Shape the power transmission beam to spread over a wider range.

[0181] like Figure 12 As shown, when Pmin / Pest>Gmax holds true, it is difficult to efficiently supply power to the receiving device 30 because even if the power supply is maximized, it is still less than the minimum value of the input power range, Pmin.

[0182] Therefore, processor 12 can also perform any of the following processes.

[0183] • Notification that prompts the user, the power receiving device 30, or the movable mechanism of the power receiving device 30 to bring the power receiving device 30 close to the power supply device 10.

[0184] • Display information related to the area that can be powered, such as a map image, on the display of the power receiving device 30.

[0185] • Report to the power receiving device 30 or the user that power cannot be supplied to the power receiving device 30.

[0186] • Notify the user, the power receiving device 30, or the movable mechanism of the power receiving device 30 to make the power receiving surface of the power receiving device 30 parallel to the power supply surface of the power supply device 10.

[0187] • Notify the user or the powered device 30 that the efficiency of supplying power to the powered device 30 is low.

[0188] As explained above, the power transmission device according to this embodiment radiates a test beam with a power set slightly weaker than the power supply power, and receives feedback information related to the reception result of the test beam in the power receiving device and the power receiving capability of the power receiving device. Then, the power transmission device determines the power supply power with reference to the feedback information. Therefore, according to this power transmission device, it is possible to control the power transmission beam so that the power set after the start of wireless power supply does not exceed the power receiving capability of the power receiving device, and to achieve highly efficient power transmission.

[0189] (4) Variations

[0190] A variation of this embodiment is described.

[0191] (4-1) Variation Example 1

[0192] Explanation of Modification 1. Modification 1 is an example in which the power receiving device 30 derives the estimated received power of the power receiving unit 35 and sends feedback information containing information related to the estimated received power.

[0193] Explain the wireless power supply processing of Modified Example 1. Figure 13 This is a diagram showing the overall flow of the wireless power supply process in Modification 1.

[0194] like Figure 13 As shown, power transmission device 10 and Figure 9 The same radiation test beam (S110) is performed.

[0195] After step S110, the power receiving device 30 and Figure 9 Similarly, the reference voltage is detected (S130).

[0196] After step S130, the powered device 30 performs the process of deriving the estimated received power (S132).

[0197] Specifically, processor 32 refers to a received power database and a reference voltage detected in step S130 to determine the received power value corresponding to the value of the reference voltage detected in step S130. Thus, processor 32 derives an estimated received power corresponding to the reference voltage.

[0198] Furthermore, when the power receiving device 30 has multiple power receiving modules, the reference voltage is detected for each power receiving module. The processor 32 can derive the estimated received power individually for all reference voltages, or it can derive the estimated received power individually for a portion of the reference voltages (e.g., only the maximum value or only the minimum and maximum values).

[0199] After step S132, the powered device 30 performs the sending of feedback information (S131a).

[0200] Specifically, the processor 32 sends feedback information related to the reception results of the test beam in the power receiving unit 35 and the power receiving capability of the power receiving unit 35 to the power transmitting device 10 via the communication interface 34.

[0201] As an example, processor 32 sends feedback information to power transmission device 10 containing information representing the estimated received power derived in step S132 (an example of "information related to the reception result").

[0202] In step S132, when the estimated received power is derived individually for multiple power receiving modules, the processor 32 may send feedback information containing information representing the total estimated received power of these power receiving modules to the power transmitting device 10, or it may send feedback information containing information representing a portion of the estimated received power of these power receiving modules (e.g., only the maximum value or only the minimum and maximum values) to the power transmitting device 10.

[0203] In step S131a, the processor 32 may also send feedback information containing information related to the power receiving capability of the power receiving device 30 (such as level information or input power range information) to the power transmitting device 10.

[0204] Furthermore, the receiving device 30 can also transmit information related to its power receiving capability to the power transmitting device 10 at a time different from step S131a. For example, the receiving device 30 can also start at... Figure 13 Before wireless power supply processing, information related to power receiving capability is sent to the power transmitting device 10. In this case, the information related to power receiving capability can be included in the power supply request.

[0205] After step S131a, the power supply device 10 performs the determination of the power supply (S112a).

[0206] Specifically, the processor 12 determines the estimated received power value derived in step S132 by referring to the feedback information sent in step S131a. Then, the processor 12 determines the power supply power by referring to the estimated received power and information related to the power receiving capability of the powered device 30. Other details related to step S112a have been described in this embodiment regarding step S112 (see [reference]). Figures 9-12 ).

[0207] As explained above, the power transmission device involved in Modification 1 radiates a test beam with a power set slightly weaker than the power required for supplying power, and receives feedback information related to the reception result of the test beam in the receiving device and the receiving capability of the receiving device. Then, the power transmission device determines the power required for supplying power based on the feedback information. Therefore, according to this power transmission device, it is possible to control the power of the transmission beam after the start of wireless power supply so that it does not exceed the receiving capability of the receiving device, and to achieve highly efficient power transmission.

[0208] (4-2) Variation Example 2

[0209] Explanation of Modification Example 2. Modification Example 2 is an example in which the power receiving device 30 calculates the range of the power ratio (Pmax / Pest to Pmin / Pest) mentioned above and sends feedback information containing information related to the power ratio.

[0210] Explain the wireless power supply processing in Modified Example 2. Figure 14 This is a diagram showing the overall flow of the wireless power supply process in Modification Example 2.

[0211] like Figure 14 As shown, power transmission device 10 and Figure 9 The same radiation test beam (S110) is performed.

[0212] After step S110, the power receiving device 30 and Figure 9 Similarly, the reference voltage is detected (S130).

[0213] After step S130, the power receiving device 30 and Figure 13 Similarly, derive the estimated received power (S132).

[0214] After step S132, the powered device 30 performs a power ratio calculation (S133).

[0215] Specifically, the processor 32 determines the maximum value Pmax and minimum value Pmin of the input power range of the powered device 30 by referring to information related to the power receiving capability. The processor 32 calculates the power ratios (Pmax / Pest and Pmin / Pest) of the maximum value Pmax and the minimum value Pmin relative to the estimated received power (Pest) derived in step S132.

[0216] In step S132, when the processor 32 derives the estimated received power individually for multiple powered modules, the processor 32 can derive the power ratio individually for all of these estimated received powers.

[0217] In step S132, when the estimated received power is derived individually for multiple powered modules, the processor 32 can calculate the power ratio for all the estimated received power of these powered modules, or it can calculate the power ratio for a portion of the estimated received power of these powered modules (e.g., only the maximum value or only the minimum and maximum values).

[0218] After step S133, the powered device 30 performs the sending of feedback information (S131b).

[0219] Specifically, the processor 32 sends feedback information related to the reception results of the test beam in the power receiving unit 35 and the power receiving capability of the power receiving unit 35 to the power transmitting device 10 via the communication interface 34.

[0220] As an example, processor 32 sends feedback information containing information representing the power ratio derived in step S133 to power transmission device 10.

[0221] In step S133, when the power ratio is calculated individually for multiple power receiving modules, the processor 32 may send feedback information containing information representing the total power ratio of these power receiving modules to the power transmitting device 10, or it may send feedback information containing information representing a portion of the power ratio of these power receiving modules (e.g., only the maximum value or only the minimum and maximum values) to the power transmitting device 10.

[0222] After step S131b, the power supply device 10 performs the determination of the power supply (S112b).

[0223] Specifically, processor 12 determines the value of the power ratio derived in step S133 by referring to the feedback information sent in step S131b. Then, processor 12 determines the power required for supplying power based on the power ratio. Other details related to step S112b have been described in this embodiment regarding step S112 (see [reference]). Figures 9-12 ).

[0224] As explained above, the power transmission device involved in Modification 2 radiates a test beam with a power set slightly weaker than the power supply power, and receives feedback information related to the reception result of the test beam in the receiving device and the receiving capability of the receiving device. Then, the power transmission device determines the power supply power with reference to the feedback information. Therefore, according to this power transmission device, it is possible to control the power transmission beam so that its power does not exceed the receiving capability of the receiving device after wireless power supply begins, and to achieve highly efficient power transmission.

[0225] (4-3) Variation Example 3

[0226] Modification 3 is an example in which, when the power receiving section 35 includes multiple power receiving modules, some power receiving modules do not have a circuit structure for implementing the detection function (that is, a circuit structure for detecting the reference voltage). Figure 15 This is a diagram illustrating the circuit structure of a power receiving module that does not have a detection function.

[0227] like Figure 15 As shown, the power receiving module included in the power receiving section 35 includes an antenna 351, a diode D, and a capacitor C.

[0228] The anode of diode D is grounded, and the cathode of diode D is connected to antenna 351, the first terminal of capacitor C, and node N0. The first terminal of capacitor C is connected to antenna 351, the cathode of diode D, and node N0, and the second terminal of capacitor C is grounded. Diode D and capacitor C convert (i.e., rectify) the alternating current output from antenna 351 receiving the transmitted beam into direct current. The direct current obtained by diode D and capacitor C is guided to a battery (not shown) via node N0. Any circuit structure may exist between node N0 and the battery, or no circuit structure may be present.

[0229] Any part of the multiple power receiving modules provided in the power receiving unit 35 can be replaced with Figure 15 Such a power receiving module. However, as explained below, in order to monitor the received power at a specific location, preferably, the power receiving module disposed near that specific location has a circuit structure for implementing the detection function.

[0230] For example, the power beam can be shaped to have the highest power level near the center of the receiving surface. In this case, the receiving module, including the antenna 351 positioned near the center of the receiving surface, is more likely to receive power exceeding its receiving capacity than other receiving modules. Therefore, preferably, such a receiving module has a circuit structure for implementing a detection function.

[0231] Furthermore, the power transmission beam can be shaped to fit the edge (i.e., edge or vertex) of the receiving surface at the location of the power receiving device 30. In this case, the received power in the power receiving module, including the antenna 351 disposed near the edge of the receiving surface, can be used to detect if the power transmission beam is not shaped into an ideal shape (e.g., rotational offset or too small). Therefore, preferably, such a power receiving module has a circuit structure for implementing the detection function.

[0232] As explained above, according to the power receiving device involved in Modification 3, the structure of some power receiving modules can be simplified compared to the structure of the power receiving device in this embodiment or Modifications 1 to 2, and the same effect as these power receiving devices can be obtained.

[0233] (4-4) Variation Example 4

[0234] Modification 4 is an example in which the power transmission device 10 shapes the power transmission beam by referring to the static and dynamic information of the power receiving unit before radiating the test beam (S110). That is, according to Modification 4, the power transmission device 10 radiates the shaped test beam.

[0235] (4-4-1) Overview of the implementation method

[0236] A summary of variation example 4 is provided. Figure 17 This is a summary illustration of variation 4.

[0237] In Modification 4, the power transmitting device 10 determines not only the position and orientation of the receiving surface corresponding to the receiving part 35 of the power receiving device 30, but also the size and shape of the receiving surface. Then, the power transmitting device 10 shapes the power transmitting beam to converge at the position of the receiving surface to a point suitable for the orientation, size, and shape of the receiving surface before radiating it. As an example, the power transmitting device 10 radiates RF beams with different phases and amplitudes than the plurality of antennas 151.

[0238] In short, such as Figure 17 As shown, the power transmission device 10 prevents electromagnetic waves from leaking to areas outside the receiving surface RS by concentrating the power transmission beam PTB on the receiving surface RS. Therefore, adverse effects on living organisms and equipment caused by electromagnetic wave leakage into the vicinity of the power receiving device 30 can be suppressed. Furthermore, since the power transmission beam PTB reaches, for example, the entire area of ​​the receiving surface RS, the overall power receiving performance of the multiple antennas 351 provided in the power receiving section 35 can be brought out. That is, the amount of power that can be received per unit time can be increased, achieving high-efficiency power transmission.

[0239] (4-4-2) Power supply control processing

[0240] Explain the power supply control process of variation example 4. Figure 18 This is a flowchart illustrating the power supply control process of variation example 4. Figure 19 This is an example Figure 18 The flowchart details step S210. Figure 20 This is a diagram illustrating the structure of information received by the power transmitting device from the power receiving device. Figure 21 This is an example Figure 18 The flowchart details step S220. Figure 22 This is a diagram illustrating an ideal beam shape. Figure 23 This is a diagram illustrating an ideal beam shape.

[0241] Figure 18 The power supply control process begins, for example, in response to the processor 12 receiving a power supply request from the powered device 30 via the communication interface 14.

[0242] like Figure 18 As shown, the power transmission device 10 performs the determination of static information related to the power receiving surface (S210).

[0243] Specifically, the processor 12 determines static information related to the power receiving surface.

[0244] Static information related to the receiving surface refers to properties or states of the receiving surface that are assumed to be unlikely to change during the period from the start to the end of wireless power supply. For example, static information includes the size and shape of the receiving surface.

[0245] The dimensions of the receiving surface represent its actual size. For example, the dimensions of the receiving surface can include at least one of the following.

[0246] • Used to specify a portion or all of the length of the outline of the receiving surface (e.g., the length of the edge of the receiving surface or the total length of the receiving surface).

[0247] • Used to specify the length between two points on the outline of the receiving surface (e.g., the length of the diagonal of the receiving surface, the radius of the receiving surface, the length of the major axis of the receiving surface, or the length of the minor axis of the receiving surface).

[0248] • The area enclosed by the outline used to define the receiving surface

[0249] The shape of the receiving surface represents its geometry. The shape of the receiving surface can be, for example, an arbitrary combination of curves (e.g., a circle or an ellipse), an arbitrary combination of straight lines (e.g., a polygon), or an arbitrary combination of curves and straight lines (e.g., a sector).

[0250] As an example, the determination of static information related to the power receiving surface (S210) is carried out according to... Figure 19 conduct.

[0251] like Figure 19 As shown, the power supply device 10 performs the determination of dimensions (S211).

[0252] Specifically, the processor 12 determines the size of the receiving surface by referring to the information received from the receiving device 30.

[0253] As an example, the communication interface 14 of the power transmitting device 10 receives power from the power receiving device 30. Figure 20 The information shown is part or all of the information. This information may also be included, for example, in a power supply request sent by the receiving device 30 to the transmitting device 10.

[0254] like Figure 20 As shown, the information received from the power receiving device 30 can include not only the power receiving part ID, but also size information, shape information, and posture information.

[0255] The power receiver ID is information used to identify the power receiver 35 of the power receiver 30 that serves as the transmitting source. The power receiver ID is stored, for example, in the storage device 31 of the power receiver 30.

[0256] The size information relates to the size of the receiving surface, which corresponds to the receiving part 35 identified by the receiving part ID. The size information is stored, for example, in the storage device 31 of the receiving device 30.

[0257] The shape information is information related to the shape of the receiving surface, which corresponds to the receiving part 35 identified by the receiving part ID. The shape information is stored, for example, in the storage device 31 of the receiving device 30.

[0258] The attitude information is information related to the attitude of the receiving surface, which corresponds to the receiving part 35 identified by the receiving part ID. As an example, the attitude information is generated by the processor 32 of the receiving device 30 based on the sensing results of the attitude sensor (an example of the input device 36). As another example, the attitude information can also be generated using the received phase difference between the receiving antenna elements in response to the incoming signal.

[0259] The processor 12 extracts information related to the size of the receiving surface from the information received from the receiving device 30. The processor 12 determines the size of the receiving surface by referring to the extracted information.

[0260] like Figure 19 As shown, the power supply device 10 performs the defined shape (S212).

[0261] Specifically, the processor 12 determines the shape of the receiving surface by referring to the information received from the receiving device 30.

[0262] As an example, the information received by the processor 12 from the self-powered device 30 ( Figure 20 The processor 12 extracts information related to the shape of the receiving surface. The processor 12 determines the shape of the receiving surface by referring to the extracted information.

[0263] Step S212 can be as follows Figure 19 It can be executed after step S211, or it can be executed before step S211, or it can be executed simultaneously with step S211.

[0264] like Figure 18 As shown, the power transmission device 10 performs the determination of dynamic information related to the power receiving surface (S220).

[0265] Specifically, the processor 12 determines dynamic information related to the power receiving surface.

[0266] Step S220 can be as follows Figure 18It can be executed after step S210, or it can be executed before step S210, or it can be executed simultaneously with step S210.

[0267] Dynamic information related to the receiving surface refers to the properties or state of the receiving surface that are conceivable to change during the period from the start to the end of wireless power supply. For example, dynamic information includes the position and orientation of the receiving surface. If the receiving device 30 moves or rotates during the period from the start to the end of wireless power supply, at least one of the position and orientation of the receiving surface will change.

[0268] The location of the receiving surface refers to its relative position to the transmitting surface. For example, the location of the receiving surface can include at least one of the following.

[0269] • Used to define the coordinates of one or more reference points (e.g., vertices) on the outline of the power receiving surface.

[0270] • Coordinates of one or more reference points (e.g., at least one of the center point and the centroid) located inside the power receiving surface

[0271] The attitude of the receiving surface refers to its relative orientation with respect to a reference plane (such as a horizontal plane or a power supply surface). As an example, the attitude of the receiving surface is the tilt of the receiving surface with respect to the reference plane (such as at least one of the roll angle, pitch angle, and yaw angle of the receiving surface).

[0272] As an example, the determination of dynamic information related to the power receiving surface (S220) is carried out according to... Figure 21 To proceed.

[0273] like Figure 21 As shown, the power supply device 10 performs the position determination (S221).

[0274] Specifically, the processor 12 determines the location of the receiving surface. The location of the receiving surface can be determined using various techniques. Preferably, the processor 12 determines the location of the receiving surface without wireless power transmission. Thus, since it is not necessary to radiate a power transmission beam to determine the location of the receiving surface, no adverse effects on surrounding organisms or equipment are generated when determining the location of the receiving surface.

[0275] In Modification 4, the processor 12 determines the position of the receiving surface by referring to the sensing results of the optical sensor (an example of the input device 16).

[0276] As an example, processor 12 measures the distance from the camera to the object location by referring to an image of the power receiving device 30 captured by the camera. Then, processor 12 can determine the position of the power receiving surface based on the measured distance and known parameters (e.g., the positional relationship between the camera and the power receiving surface, the camera's imaging conditions (e.g., viewing angle and angle), and the positional relationship between the object location and the power receiving surface (e.g., the center point of the power receiving surface). Alternatively, processor 12 can also determine the position of the power receiving surface by referring to the measurement results of a ranging sensor (e.g., an ultrasonic sensor, LiDAR, etc.).

[0277] The object portion is a feature that can be viewed from the outside of the power receiving device 30. The object portion may include, for example, at least one of the following.

[0278] • A portion of the power receiving device 30 or the housing used to cover the power receiving device 30 that has been marked (e.g., a two-dimensional barcode, specific embossing, a specific pattern, a specific color, or a specific shape).

[0279] At least one vertex, corner, side, or integral part of antenna 351

[0280] • The vertex, corner, edge, or entirety of the power receiving part 35

[0281] like Figure 21 As shown, the power supply device 10 performs a determined posture (S222).

[0282] Specifically, the processor 12 determines the orientation of the power receiving surface by referring to the information received from the power receiving device 30.

[0283] As an example, the information received by the processor 12 from the self-powered device 30 ( Figure 20 The processor 12 extracts information related to the orientation of the receiving surface. The processor 12 determines the orientation of the receiving surface by referring to the extracted information.

[0284] Step S222 can be as follows Figure 21 It can be executed after step S221, before step S221, or simultaneously with step S221.

[0285] After steps S210 and S220, the power supply device 10 generates control parameters (S230).

[0286] Specifically, the processor 12 generates control parameters (e.g., beam excitation conditions) related to beamforming by referring to the static information of the receiving surface determined in step S210 and the dynamic information of the receiving surface determined in step S220.

[0287] As an example, the processor 12 generates control parameters in such a way that the power beam radiated from the power transmission unit 15 is focused at the position of the power receiving surface into a point suitable for the size, shape, and orientation of the power receiving surface.

[0288] As a result, the power transmission beam is concentrated in a manner that covers almost the entire area of ​​the receiving surface, thus enabling the extraction of most of the power receiving performance of the antenna 351 provided by the receiving unit 35 (that is, enabling high-efficiency wireless power transmission), while suppressing electromagnetic wave leakage to the surrounding area of ​​the receiving unit 35.

[0289] In the first example, the control parameters are determined such that... Figure 22 As shown, the intensity of the transmitted beam is half of its maximum value (i.e., half-value) in at least a portion of the edge (i.e., the vertex) of the receiving surface. This allows for the suppression of power deviation between antennas 351 and efficient power transmission.

[0290] In the second example, the control parameters are determined such that... Figure 23 As shown, the intensity of the power transmission beam is null (i.e., zero) in at least a portion of the edge of the receiving surface. This allows for further improvement in power transmission efficiency.

[0291] After step S230, the power supply device 10 performs wireless power supply (S240).

[0292] Specifically, the processor 12 causes the power transmission unit 15 to radiate a power transmission beam according to the control parameters generated in step S230.

[0293] In step S240, the power supply device 10 and the power receiving device 30 perform... Figure 9 , Figure 13 or Figure 14 Wireless power supply processing.

[0294] After step S240, the power supply device 10 performs a power supply termination determination (S250).

[0295] Specifically, the processor 12 determines whether power supply has ended. The processor 12 may determine that power supply has ended if at least one of the following conditions is met.

[0296] • The battery capacity of the power receiving device 30 has reached a threshold (e.g., fully charged) (e.g., referring to information received from the power receiving device 30).

[0297] • The powered device 30 becomes undetectable (e.g., the wireless connection to the powered device 30 is severed).

[0298] • Received a power supply termination request from the power receiving device 30

[0299] • Vibration of the receiving device 30 is detected (when the vibration of the receiving device 30 is detected by the vibration sensor provided with the receiving device 30, the receiving device 30 can send a vibration detection signal).

[0300] • The human body sensor connected to the power supply device 10 detected a person

[0301] • (For example, a remote control not shown) receives a power-off end signal.

[0302] • A specified time has elapsed since the start of wireless power transmission.

[0303] If it is determined in step S250 that the power supply has ended, the power supply device 10 ends the power supply control process.

[0304] If it is determined in step S250 that the power supply has not ended, the power supply device 10 performs wireless power supply again (S240) and power supply end determination (S250).

[0305] As explained above, in Modification 4, the power transmitting device determines not only the position and orientation of the receiving surface corresponding to the receiving part of the power receiving device, but also the size and shape of the receiving surface. Then, the power transmitting device shapes the power transmitting beam and radiates it in a manner that converges the power transmitting beam at the position of the receiving surface to a point suitable for the orientation, size, and shape of the receiving surface. Thus, the power transmitting device concentrates the power transmitting beam onto the receiving surface, thereby preventing electromagnetic waves from leaking to areas outside the receiving surface. Therefore, it is possible to suppress adverse effects on living organisms and equipment caused by electromagnetic waves leaking into the vicinity of the power receiving device. Furthermore, since the power transmitting beam reaches, for example, the entire area of ​​the receiving surface, it is possible to extract the combined power receiving performance of the multiple antennas provided by the receiving part. That is, it is possible to increase the amount of power that can be received per unit time, thereby achieving high-efficiency power transmission.

[0306] (4-5-1) Variation 5

[0307] Explanation of Modification 5. Modification 5 is an example of updating control parameters in response to changes in dynamic information related to the receiving surface, as described in Modification 4.

[0308] Explain the power supply control process of variation example 5. Figure 24 This is a flowchart illustrating the power supply control process of variation 5. Figure 25 This diagram illustrates the control of the power transmission beam when the orientation of the receiving surface changes.

[0309] like Figure 24 As shown, power transmission device 10 and Figure 18Similarly, the following steps are performed: determining static information related to the receiving surface (S210), determining dynamic information related to the receiving surface (S220), generating control parameters (S230), wireless power transmission (S240), and determining the end of power transmission (S250).

[0310] If it is determined in step S250 that the power supply has ended, the power supply device 10 and Figure 18 Similarly, the power supply control process ends.

[0311] If it is determined in step S250 that the power supply has not ended, and Figure 18 In contrast, the power transmission device 10 again performs the following steps: determining dynamic information related to the power receiving surface (S220), generating control parameters (S230), wireless power transmission (S240), and determining the end of power transmission (S250).

[0312] Therefore, control parameters can be updated in response to changes in dynamic information related to the receiving surface. For example, when the orientation of the receiving surface changes due to rotation, such as... Figure 25 As shown, the change in the orientation of the receiving surface can be tracked by changing the rotation angle of the power transmission beam PTB.

[0313] As explained above, the power transmission device according to Modification 5 can adaptively shape the power transmission beam even if at least one of the position or orientation of the receiving surface changes. That is, it can robustly suppress electromagnetic wave leakage and achieve high-efficiency wireless power transmission in response to the movement (movement or rotation) of the receiving device.

[0314] (4-2) Variation 6

[0315] Explanation of Modification 6. Modification 6 is an example in which static information related to the receiving surface is pre-stored in the storage device 11 of the power transmission device 10, as in Modification 4 or Modification 5.

[0316] In variation 6, processor 12 in Figure 18 or Figure 24 In step S210, the static information related to the receiving surface is determined by referring to the power receiving part database stored in the storage device 11.

[0317] Figure 26 This is a diagram illustrating the data structure of the power receiving unit database in Modified Example 6. The power receiving unit database is stored in storage device 11.

[0318] like Figure 26 As shown, the power receiving part database contains a "Power Receiving Part ID" field, a "Shape" field, and a "Size" field. These fields are related to each other.

[0319] Static information related to the receiving surface corresponding to each power receiving unit 35 is registered in the power receiving unit database.

[0320] Store the aforementioned power receiving part ID in the "Power Receiving Part ID" field.

[0321] Store the shape information described above in the "Shape" field.

[0322] Store the above dimension information in the "Dimensions" field.

[0323] For example, when the power transmitting device 10 wirelessly transmits power to the power receiving unit 35 for the first time, or when the power receiving unit 35 is registered as one of the power supply objects to the power transmitting device 10, the processor 12 may refer to the information received from the power receiving device 30 to register the static information related to the power receiving surface corresponding to the power receiving unit 35 into the power receiving unit database, or a person may manually register the static information related to the power receiving surface corresponding to the power receiving unit 35 into the power receiving unit database.

[0324] Furthermore, at least one of the shape information and size information can also be associated with the model information in place of the power receiving part ID. The model information is information related to the model of at least one of the power receiving device 30 and the power receiving part 35.

[0325] As explained above, in the power transmission device according to Modification 6, static information related to the receiving surface is pre-stored in the storage device 11 of the power transmission device 10. Therefore, whenever wireless power transmission is performed, even if static information related to the receiving surface is not received from the receiving device 30, the static information related to the receiving surface can be determined to shape the power transmission beam. That is, even in situations where it is difficult or impossible to receive information from the receiving device 30, electromagnetic wave leakage can be suppressed and high-efficiency wireless power transmission can be achieved.

[0326] (5) Other variations

[0327] Storage device 11 can be connected to power supply device 10 via network NW. Storage device 31 can be connected to power receiving device 30 via network NW.

[0328] In this implementation, an example is shown where the receiving device sends a power request to the transmitting device. However, even without receiving a power request, the wireless transmitting device can still wirelessly supply power to a receiving device. For example, the wireless transmitting device can supply power wirelessly according to a predetermined schedule, or it can collect battery capacity information from the receiving device to determine whether wireless power supply is needed.

[0329] In this implementation, power receiving level information is used as information related to power receiving capability. However, the information related to power receiving capability can be arbitrarily determined. As an example, the information related to power receiving capability could also be information related to the efficiency of the power receiving unit 35 with respect to input power. Figure 16 It is a graph obtained by plotting the efficiency with respect to input power. For example, it can also be that the minimum value of the input power range obtained by setting the decrease relative to the maximum value related to efficiency within a specified value or a specified ratio is determined as Pmin, and the maximum value is determined as Pmax.

[0330] In the implementation, examples are shown of calculating the power ratios (Pmax / Pest) of the maximum value Pmax and the minimum value Pmin relative to the estimated received power (Pest). However, when the power receiving unit 35 has multiple power receiving modules, a deviation in power density occurs between the power receiving modules.

[0331] Therefore, as Figure 29 As shown, processor 12 can also calculate the ratio of the maximum value Pmax to the first estimated received power (Pest1) (Pmax / Pest1), and the ratio of the minimum value Pmin to the second estimated received power (Pmin / Pest2) (Pmin / Pest2). The first estimated received power is the maximum value of the estimated received power across multiple powered modules. The second estimated received power is the minimum value of the estimated received power across multiple powered modules. Figure 29 In this context, the ratio (Pmax / Pest1) represents the upper limit of the power ratio that enables all modules to operate safely, and the ratio (Pmin / Pest2) represents the lower limit of the power ratio that enables all modules to operate efficiently.

[0332] However, as Figure 30 As shown, even if Pmax / Pest1 > Pmin / Pest2 does not hold true, the processor 12 can still change the second estimated received power to a larger value. Specifically, the processor 12 sets the minimum value among the estimated received powers of multiple powered modules that makes Pmax / Pest1 > Pmin / Pest2 true as Pest2. Figure 30 In the example, the estimated received power Pe1 of module 1 is the minimum, but if module 1 is to operate efficiently, it is unsafe to operate module 2. Therefore, the estimated received power Pe1 of module 1 is removed from the candidates for the second estimated received power. Then, the processor 12 selects the estimated received power Pe3 of module 3, which has the minimum estimated received power among the remaining modules, as the second estimated received power. In this case, Pmax / Pest1 > Pmin / Pest2 holds true. Figure 30In this equation, the ratio (Pmax / Pest1) represents the upper limit of the power ratio that enables all modules to operate safely, and the ratio (Pmin / Pest2) represents the lower limit of the power ratio that enables modules 2 and 3 to operate efficiently. Thus, even if Pmax / Pest1 > Pmin / Pest2 is not true, by changing the second estimated received power, the safe operation of all modules can be guaranteed, and a power range that enables more modules to operate efficiently can be found.

[0333] The power receiving device 30 can also detect whether an output voltage has been generated in each of the multiple power receiving modules included in the power receiving unit 35 when receiving a test beam or a power transmission beam with a set power supply. Furthermore, if the power receiving device 30 detects a module that has not generated an output voltage, it can send a power supply termination request to stop power supply. Additionally, it can notify the user of the power supply termination before or after power supply is stopped. This prevents adverse situations caused by irradiating the power receiving device 30 with a faulty power receiving module.

[0334] In the implementation, it is explained that when there is an overlap between the power ratio range (Pmax / Pest to Pmin / Pest) and the gain range (Gmax to Gmin) (hereinafter referred to as the "power supply recommended range"), the processor 12 determines a gain (Gopt) from the power supply recommended range. However, the processor 12 may also disregard the power ratio Pmin / Pest.

[0335] Specifically, when Pmax / Pest ≥ Gmax ≥ Gmin, the processor 12 determines a gain (Gopt) from the gain range (Gmax ~ Gmin). Furthermore, when Gmax ≥ Pmax / Pest ≥ Gmin, the processor 12 determines a gain (Gopt) from the gain range (Pmax / Pest ~ Gmin).

[0336] When the power transmission unit 15 radiates a power transmission beam with such power supply, the received power in the power receiving device 30 is expected not to exceed the maximum value of the input power range of the power receiving device 30, thus enabling the power receiving device 30 to operate safely.

[0337] In this embodiment, an example of a power transmission device having a single power transmission unit is described. However, a power transmission device may also have multiple power transmission units that can be controlled independently. Furthermore, the power transmission unit and other structural elements (e.g., a control unit) in the power transmission device may be configured as separate devices capable of communicating with each other. That is, the power transmission device may also not have a power transmission unit. In this case, the power transmission unit can be embedded in a device having a communication interface for receiving control parameters from the power transmission device and a processor (e.g., a microcomputer) for driving the power transmission unit according to the control parameters from the power transmission device.

[0338] Similarly, the power receiving part and other structural elements (such as the control part) in the power receiving device can also be configured as different devices that can communicate with each other. That is, the power receiving device may not have a power receiving part.

[0339] In the implementation, an antenna is given as an example of a beam radiating element. However, when light waves are used as electromagnetic waves for power supply, the beam radiating element may also be a light-emitting element such as a laser element or an LED chip.

[0340] In this embodiment, an example is shown where the receiving device 30 sends information related to its power receiving capability (e.g., rating information or input power range information) to the transmitting device 10. However, even if the receiving device 30 does not send information related to its power receiving capability, the transmitting device 10 can still determine such information. For example, the processor 12 can also read the power receiving capability-related information stored in a code assigned to the receiving device 30 or the housing covering the receiving device 30.

[0341] Regarding variations 4 to 6, the static information of the receiving surface (e.g., at least one of its size and shape) can also be determined using techniques different from those described previously.

[0342] For example, the processor 12 can also read the information about the size of the receiving surface stored in the code that is assigned to the power receiving device 30 or the housing used to cover the power receiving device 30.

[0343] In Modifications 4 to 6, examples are shown of measuring the distance from the camera to the target location by referring to an image of the power receiving device 30 captured by the camera. The camera can be a stereo camera or a monocular camera. Compared to using a stereo camera, using a monocular camera allows for a smaller and lower-cost implementation of the power supply device 10. Hereinafter, an example of a technique for measuring the distance from the monocular camera to the target location by referring to an image of the power receiving device 30 captured by the monocular camera will be described.

[0344] like Figure 27 As shown, a single-lens reflex camera captures a subject including the object's OP (operational part). For example... Figure 28 As shown, the processor 12 extracts the region corresponding to the object part OP by performing image processing on the image captured by the monocular camera. The processor 12 counts the number of pixels in the region corresponding to the object part OP. Here, the number of pixels in the region corresponding to the object part OP depends on the distance from the monocular camera to the object part OP. Assuming that when the number of pixels when the distance = L is set as S1 and the number of pixels when the distance = X is set as S2, X = L × √(S1 / S2) holds. The reference distance L and the reference number of pixels S1 are calculated in advance as constants, so that the processor 12 can derive X as a function of S2. As an example, when L = 100 [cm] and S1 = 600 × 400 [pixels], and the count is S2 = 300 × 200 [pixels], according to the above formula, X = 200 [cm].

[0345] The reference distance L and the reference pixel count S1 can be included in the static information of the receiving surface. That is, the reference distance L and the reference pixel count S1 can be determined by reading information stored in a code (e.g., a two-dimensional barcode) that is applied to the receiving device 30 or the housing used to cover the receiving device 30, or the receiving device 30 can send such information to the power transmitting device 10.

[0346] The location of the receiving surface can also be determined using a technique different from the one described above.

[0347] As a first example, the receiving device 30 can determine the position of the power-transmitting surface relative to the receiving surface by referring to the sensing results of, for example, an optical sensor (an example of the input device 36), and send information related to the determined position to the power-transmitting device 10. The power-transmitting device 10 converts the position determined by the receiving device 30 by setting the position of the power-transmitting surface as the origin, thereby determining the relative position of the receiving surface relative to the power-transmitting surface.

[0348] As a second example, the receiving device 30 can also be fixed by a support body configured to hold the receiving surface at a predetermined position relative to the transmitting surface. Thus, the processor 12 can determine the position of the receiving surface to the predetermined value without measuring the relative position of the receiving surface to the transmitting surface. This predetermined value can be stored in the storage device 11 before wireless power supply begins.

[0349] As a third example, the power transmitting device 10 uses GPS (Global Positioning System) to measure the absolute coordinates (e.g., latitude, longitude, and altitude) of the power transmitting surface. Similarly, the power receiving device 30 uses GPS to measure the absolute coordinates of the power receiving surface and transmits information related to the measured absolute coordinates to the power transmitting device 10. The power transmitting device 10 subtracts the absolute coordinates of the power transmitting surface from the absolute coordinates of the power receiving surface, thereby determining the relative position of the power receiving surface with respect to the power transmitting surface.

[0350] The orientation of the receiving surface can also be determined using a technique different from the one described previously.

[0351] Specifically, the processor 12 can determine the pose of the receiving surface by referring to the sensing results of the optical sensor. As an example, the processor 12 can determine the pose of the receiving surface by performing image processing on the image of the receiving device 30 captured by the camera (e.g., extracting the vertices of the receiving surface and matching the extracted vertices with the shape of the receiving surface).

[0352] As a second example, the receiving device 30 can also be fixed by a support body configured to hold the receiving surface relative to the transmitting surface at a predetermined value. Thus, the processor 12 can determine the orientation of the receiving surface to the predetermined value without measuring the orientation of the receiving surface relative to the transmitting surface. This predetermined value can be stored in the storage device 11 before wireless power supply begins.

[0353] In variations 4 to 6, examples are shown of generating control parameters by referring to the position, size, shape, and orientation of the receiving surface. However, control parameters may also be generated without referring to at least one of the shape and orientation.

[0354] As a first example, the processor 12 can generate control parameters in such a way that the power beam radiated from the power transmission unit 15 is focused at the position of the power receiving surface into a point suitable for the size of the power receiving surface.

[0355] As a second example, the processor 12 may also generate the above-mentioned control parameters by converging the power beam radiated from the power transmission unit 15 at the position of the power receiving surface into a point suitable for the size and shape of the power receiving surface.

[0356] As a third example, the processor 12 may also generate the above-mentioned control parameters in such a way that the power transmission beam radiated from the power transmission unit 15 is focused at the position of the power receiving surface into a point suitable for the size and orientation of the power receiving surface.

[0357] In variations 4 to 6, an example is shown where power-on termination determination (S250) is performed after step S240. However, step S250 can be performed at other times. For example, when a specified interrupt event occurs, processor 12 may immediately execute step S250 and determine that power-on has ended. The interrupt event may include at least one of the following.

[0358] • The battery capacity of the power receiving device 30 has reached the threshold.

[0359] • The powered device becomes undetectable 30

[0360] • Received a power supply termination request from the power receiving device 30

[0361] • Vibration of the receiving device 30 is detected (when the vibration of the receiving device 30 is detected by the vibration sensor provided with the receiving device 30, the receiving device 30 can send a vibration detection signal).

[0362] • The human body sensor connected to the power supply device 10 detected a person

[0363] • Received power supply end signal

[0364] • A specified time has elapsed since the start of wireless power transmission.

[0365] The embodiments of the present invention have been described in detail above, but the scope of the present invention is not limited to the embodiments described above. Furthermore, various modifications or alterations can be made to the above embodiments without departing from the spirit of the present invention. Additionally, the above embodiments and variations can be combined.

[0366] Explanation of reference numerals in the attached figures

[0367] 1: Wireless power supply system; 10: Power transmission device; 11: Storage device; 12: Processor; 13: Input / output interface; 14: Communication interface; 15: Power transmission unit; 16: Input device; 17: Output device; 30: Power receiving device; 31: Storage device; 32: Processor; 33: Input / output interface; 34: Communication interface; 35: Power receiving unit; 36: Input device; 37: Output device; 151: Antenna; 351: Antenna.

Claims

1. A power transmission device comprising a control unit for controlling a power transmission unit that performs wireless power transmission, the control unit comprising: A unit that causes the power transmission unit to radiate a first power transmission beam with a first power set; A unit for acquiring feedback information related to the reception result of the first power transmission beam in the power receiving device; A unit for determining the power receiving capability of a power receiving device; and Based on the power receiving capability and the reception result, a second power unit with a higher power than the first power is determined that can be used in wireless power supply targeting the power receiving device. in, The power receiving capability includes the minimum and maximum values ​​of the input power range of the power receiving device. The unit that determines the second power determines the second power in such a way that the received power in the receiving device converges within the input power range when the power transmitting unit radiates a second power transmission beam with the second power set. The wireless power transmission uses electromagnetic waves with frequencies above microwave. The feedback information includes any one of the following: information related to the reference voltage detected in the power receiving device, information related to the received power of the first power transmission beam in the power receiving device, and information related to the power ratio calculated with reference to the reception result and the power receiving capability.

2. The power transmission device according to claim 1, characterized in that, The feedback information includes information related to the receiving result and information related to the power receiving capability. The unit that determines the power receiving capability refers to information related to the power receiving capability to determine the power receiving capability.

3. The power transmission device according to claim 1, characterized in that, The feedback information includes information related to the reference voltage detected in the powered device. The unit that determines the second power refers to information related to the reference voltage to determine the second power in such a way that the received power in the receiving device converges within the range of the input power when the power transmitting unit radiates a second power transmission beam with the second power set.

4. The power transmission device according to claim 1, characterized in that, The feedback information includes information related to the received power of the first power transmission beam in the power receiving device. The unit that determines the second power refers to information related to the received power and determines the second power in such a way that the received power in the receiving device converges to the range of the input power when the power transmitting unit radiates a second power transmission beam with the second power set.

5. The power transmission device according to claim 1, characterized in that, The feedback information includes information related to the power ratio calculated with reference to the received result and the power receiving capability. The unit that determines the second power refers to information related to the power ratio and determines the second power in such a way that the received power in the receiving device converges to the input power range when the power transmitting unit radiates a second power transmission beam with the second power set.

6. The power transmission device according to any one of claims 1 to 5, characterized in that, The input power range is the range of received power corresponding to the efficiency that decreases to within a specified value or a specified ratio relative to the maximum efficiency for received power in the powered device.

7. A power transmission control method for controlling a power transmission unit that performs wireless power transmission, wherein a computer performs the following processing: The power transmission unit radiates a first power transmission beam with a first power setting. Obtain feedback information related to the reception result of the first power transmission beam in the power receiving device; Determine the power receiving capability of the power receiving device; as well as A second power, greater than the first power, is determined based on the power receiving capability and the reception result, which can be used in wireless power supply targeting the power receiving device. The power receiving capability includes the minimum and maximum values ​​of the input power range of the power receiving device. When determining the second power, the second power is determined in such a way that the received power in the receiving device converges within the input power range when the power transmitting unit radiates a second power transmission beam with the second power set. The wireless power transmission uses electromagnetic waves with frequencies above microwave. The feedback information includes any one of the following: information related to the reference voltage detected in the power receiving device, information related to the received power of the first power transmission beam in the power receiving device, and information related to the power ratio calculated with reference to the reception result and the power receiving capability.

8. A non-transitory computer-readable medium having recorded a power transmission control program, the power transmission control program being used to control a power transmission unit performing wireless power transmission, wherein, The power supply control program causes the computer to perform the following processes: The power transmission unit radiates a first power transmission beam with a first power setting. Obtain feedback information related to the reception result of the first power transmission beam in the power receiving device; Determine the power receiving capability of the power receiving device; as well as A second power, greater than the first power, is determined based on the power receiving capability and the reception result, which can be used in wireless power supply targeting the power receiving device. The power receiving capability includes the minimum and maximum values ​​of the input power range of the power receiving device. When determining the second power, the second power is determined in such a way that the received power in the receiving device converges within the input power range when the power transmitting unit radiates a second power transmission beam with the second power set. The wireless power transmission uses electromagnetic waves with frequencies above microwave. The feedback information includes any one of the following: information related to the reference voltage detected in the power receiving device, information related to the received power of the first power transmission beam in the power receiving device, and information related to the power ratio calculated with reference to the reception result and the power receiving capability.

9. A computer program product comprising a power transmission control program, the power transmission control program being used to control a power transmission unit performing wireless power transmission, wherein, The power supply control program causes the computer to perform the following processes: The power transmission unit radiates a first power transmission beam with a first power setting. Obtain feedback information related to the reception result of the first power transmission beam in the power receiving device; Determine the power receiving capability of the power receiving device; as well as A second power, greater than the first power, is determined based on the power receiving capability and the reception result, which can be used in wireless power supply targeting the power receiving device. The power receiving capability includes the minimum and maximum values ​​of the input power range of the power receiving device. When determining the second power, the second power is determined in such a way that the received power in the receiving device converges within the input power range when the power transmitting unit radiates a second power transmission beam with the second power set. The wireless power transmission uses electromagnetic waves with frequencies above microwave. The feedback information includes any one of the following: information related to the reference voltage detected in the power receiving device, information related to the received power of the first power transmission beam in the power receiving device, and information related to the power ratio calculated with reference to the reception result and the power receiving capability.

10. A power receiving device comprising a control unit for controlling a power receiving unit that receives a power transmission beam radiated from a power transmitting device. The control unit includes a unit that sends feedback information to the power transmission device related to the reception result of the first power transmission beam radiated from the power transmission device in the power receiving unit and the power receiving capability of the power receiving unit. After sending the feedback information, the receiving unit receives a second power beam from the power transmitting device, the power level of which is higher than that of the first power beam. The power receiving capability includes the minimum and maximum values ​​of the input power range of the power receiving unit. The power of the second power transmission beam is determined in such a way that the received power in the receiving section of the second power transmission beam converges within the input power range. The wireless power transmission performed by the power transmission device uses electromagnetic waves with frequencies above microwave.

11. A power receiving control method for controlling a power receiving unit that receives a power transmission beam radiated from a power transmission device. In this power receiving control method, the computer performs the following processing: sending feedback information to the power transmitting device related to the reception result of the first power transmission beam radiated from the power transmitting device in the power receiving unit and the power receiving capability of the power receiving unit. After sending the feedback information, the receiving unit receives a second power beam from the power transmitting device, the power level of which is higher than that of the first power beam. The power receiving capability includes the minimum and maximum values ​​of the input power range of the power receiving unit. The power of the second power transmission beam is determined in such a way that the received power in the receiving section of the second power transmission beam converges within the input power range. The wireless power transmission performed by the power transmission device uses electromagnetic waves with frequencies above microwave.

12. A non-transitory computer-readable medium having recorded a power receiving control program for controlling a power receiving unit that receives a power beam radiated from a power transmitting device, wherein, The power receiving control program causes the computer to perform the following processing: sending feedback information to the power transmitting device related to the reception result of the first power transmission beam radiated from the power transmitting device in the power receiving unit and the power receiving capability of the power receiving unit. After sending the feedback information, the receiving unit receives a second power beam from the power transmitting device, the power level of which is higher than that of the first power beam. The power receiving capability includes the minimum and maximum values ​​of the input power range of the power receiving unit. The power of the second power transmission beam is determined in such a way that the received power in the receiving section of the second power transmission beam converges within the input power range. The wireless power transmission performed by the power transmission device uses electromagnetic waves with frequencies above microwave.

13. A computer program product comprising a power receiving control program for controlling a power receiving unit that receives a power beam radiated from a power transmitting device, wherein, The power receiving control program causes the computer to perform the following processing: sending feedback information to the power transmitting device related to the reception result of the first power transmission beam radiated from the power transmitting device in the power receiving unit and the power receiving capability of the power receiving unit. After sending the feedback information, the receiving unit receives a second power beam from the power transmitting device, the power level of which is higher than that of the first power beam. The power receiving capability includes the minimum and maximum values ​​of the input power range of the power receiving unit. The power of the second power transmission beam is determined in such a way that the received power in the receiving section of the second power transmission beam converges within the input power range. The wireless power transmission performed by the power transmission device uses electromagnetic waves with frequencies above microwave.

Images