Wireless power transmission system
The wireless power transmission system uses multiple antennas to detect human and device positions based on electric field strengths, simplifying the configuration by eliminating the need for sensors and ensuring efficient power transmission to devices while avoiding human bodies.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- DENSO CORP
- Filing Date
- 2022-12-16
- Publication Date
- 2026-06-23
AI Technical Summary
The configuration of wireless power transmission systems is complicated by the use of human presence sensors or cameras to detect human bodies.
A wireless power transmission system utilizing three or more power transmission antennas that communicate wirelessly with each other and with electronic devices, detecting human body and device presence areas based on electric field strengths to select a designated antenna that avoids human bodies, thereby simplifying the system configuration.
The system simplifies the configuration by eliminating the need for sensors to detect human bodies and devices, allowing efficient power transmission while avoiding human bodies and ensuring power is directed to the intended devices.
Smart Images
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Abstract
Description
Technical Field
[0001] This disclosure relates to a wireless power transmission system that wirelessly transmits power.
Background Art
[0002] Patent Document 1 describes controlling power transmission output based on the detection result of a human presence sensor using infrared rays or ultrasonic waves in a power transmission device of a wireless power transmission system.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] As a result of the inventors' detailed examination, a problem has been found that using a human presence sensor or a camera, etc. to detect a human body complicates the configuration of the wireless power transmission system. This disclosure aims to simplify the configuration of the wireless power transmission system.
Means for Solving the Problems
[0005] One aspect of this disclosure is a wireless power transmission system (1) including three or more power transmission antennas (31, 41, 51, 61, 71), a human body detection unit (S60, S80), a device detection unit (S70, S90), and an antenna selection unit (S100).
[0006] Three or more power transmitting antennas are installed at different locations within a room and are configured to communicate wirelessly with each other, and to communicate with at least one electronic device (8) located in the room, and to transmit power to at least one electronic device by transmitting radio waves to it.
[0007] The human body detection unit is configured to detect a human body presence area within a room based on the electric field strength of data communication between any two of three or more power transmitting antennas, using the electric field strength of two or more antennas as the antenna electric field strength.
[0008] The device detection unit is configured to detect the device presence area within a room where the target electronic device exists, based on the three or more device electric field strengths, using the electric field strength during data communication between each of the three or more power transmission antennas and the target electronic device as the device electric field strength.
[0009] The antenna selection unit is configured to select a designated antenna from among three or more power transmission antennas that can transmit power to the target electronic device while avoiding the human body, based on the human body presence area detected by the human body detection unit and the device presence area detected by the device detection unit.
[0010] The wireless power transmission system of this disclosure, configured in this manner, detects the positions of human bodies and electronic devices in a room using three or more power transmission antennas, and selects a power transmission antenna that can transmit power to the target electronic device while avoiding the human body. Therefore, the wireless power transmission system of this disclosure does not require sensors to detect the positions of human bodies and electronic devices in a room, and the configuration of the wireless power transmission system can be simplified. [Brief explanation of the drawing]
[0011] [Figure 1] This is a block diagram showing the configuration of a wireless power transmission system. [Figure 2] This diagram shows the arrangement of the power transmission antennas. [Figure 3] This is a flowchart showing the power transmission control process. [Figure 4] This is a diagram showing the first part of the designated antenna selection map. [Figure 5] This is a diagram showing the second part of the designated antenna selection map. [Figure 6] This is a diagram showing the third part of the designated antenna selection map. [Figure 7] This is a diagram showing the fourth part of the designated antenna selection map. [Figure 8] This is a diagram showing the fifth part of the designated antenna selection map. [Figure 9] This diagram illustrates how to select a designated antenna. [Modes for carrying out the invention]
[0012] Embodiments of the present disclosure will be described below with reference to the drawings. The wireless power transmission system 1 of this embodiment is mounted on a vehicle and, as shown in Figure 1, comprises a control device 2, power transmission devices 3, 4, 5, 6, 7, and one or more power receiving devices 8.
[0013] The control unit 2 is an electronic control unit centered around a microcomputer equipped with a CPU 11, ROM 12, RAM 13, etc. The various functions of the microcomputer are realized by the CPU 11 executing a program stored in a non-transitional physical recording medium. In this example, ROM 12 corresponds to the non-transitional physical recording medium that stores the program. Furthermore, the execution of this program executes the method corresponding to the program. Note that some or all of the functions executed by the CPU 11 may be configured hardware-wise by one or more ICs, etc. Also, the number of microcomputers that make up the control unit 2 may be one or more.
[0014] Power transmission devices 3, 4, 5, 6, and 7 each include a power transmission antenna 31, 41, 51, 61, 71, a power transmission unit 32, 42, 52, 62, 72, and a communication unit 33, 43, 53, 63, 73.
[0015] The power transmission antennas 31 to 71 are configured to transmit power transmission radio waves to the power receiving device 8 and to transmit and receive data communication radio waves with the power receiving device 8. The power transmission antennas 31 to 71 are configured to transmit and receive data communication radio waves with each other.
[0016] The power transmission units 32, 42, 52, 62, 72 are each connected to the power transmission antennas 31, 41, 51, 61, 71. The power transmission units 32 to 72 have a function of generating a high-frequency signal in a first power transmission frequency band (2.4 GHz band in this embodiment) as a transmission signal and a function of generating a high-frequency signal in a second power transmission frequency band (920 MHz band in this embodiment) lower than the first power transmission frequency band as a transmission signal. The power transmission units 32 to 72 generate a transmission signal in either the first power transmission frequency band or the second power transmission frequency band based on a command from the control device 2 and output the generated transmission signal to the power transmission antennas 31, 41, 51, 61, 71. The power transmission antennas 31 to 71 transmit power transmission radio waves when transmission signals are supplied from the power transmission units 32 to 72.
[0017] The communication units 33, 43, 53, 63, 73 each perform data communication by transmitting and receiving data communication radio waves via the power transmission antennas 31, 41, 51, 61, 71. In this embodiment, the power receiving device 8 is a portable terminal held by a vehicle occupant and includes a rechargeable battery. The power receiving device 8 has a function of performing data communication by transmitting and receiving data communication radio waves. Note that the power receiving device 8 may be an in-vehicle device including a rechargeable battery.
[0018] As shown in Fig. 2, the power transmission antennas 31 to 71 are installed in the passenger compartment VI of the vehicle VH equipped with the wireless power transmission system 1. In the passenger compartment VI, seats ST1, ST2, ST3, and ST4 are installed at four locations, namely, the front, rear, left, and right of the vehicle VH. In Fig. 2, the power transmission antennas 31, 41, 51, 61, and 71 are respectively denoted as "A", "B", "C", "D", and "E".
[0019] The power transmission antenna 31 is installed between the seat ST1 on the front right side and the seat ST2 on the front left side at the central part of the passenger compartment VI. The power transmission antenna 41 is installed in front of the seat ST1 on the front right side. The power transmission antenna 51 is installed in front of the seat ST2 on the front left side. The power transmission antenna 61 is installed behind the seat ST3 on the rear right side. The power transmission antenna 71 is installed behind the seat ST4 on the rear left side.
[0020] As a result, the seat ST1 on the front right side is located between the power transmission antenna 31 and the power transmission antenna 41. The seat ST2 on the front left side is located between the power transmission antenna 31 and the power transmission antenna 51. The seat ST3 on the rear right side is located between the power transmission antenna 31 and the power transmission antenna 61. The seat ST4 on the rear left side is located between the power transmission antenna 31 and the power transmission antenna 71.
[0021] The procedure of the power transmission control process executed by the control device 2 will be described. The power transmission control process is a process that starts when the accessory power supply or ignition power supply of the vehicle is switched from off to on.
[0022] When the power transmission control process is executed, the CPU 11 of the control device 2 first determines, as shown in Fig. 3, whether all the doors of the vehicle equipped with the wireless power transmission system 1 are closed in S10. Here, if there is an open door, the CPU 11 waits until all the doors of the vehicle are closed by repeating the process of S10.
[0023] Then, when all the vehicle doors are closed, the CPU 11 determines in S20 whether or not the vehicle has started moving. Specifically, the CPU 11 obtains a vehicle speed detection signal from the vehicle speed sensor installed in the vehicle, and based on the vehicle speed detection signal, determines that the vehicle has started moving if the vehicle speed is equal to or greater than a preset starting value (for example, 3 km / h).
[0024] If the vehicle has not yet started moving, the CPU 11 proceeds to S10. On the other hand, if the vehicle has started moving, in S30, the CPU 11 communicates data with one or more power receiving devices 8 inside the vehicle via the power transmission antennas 31-71 to obtain battery level information indicating the remaining battery level of the power receiving devices 8 from one or more power receiving devices 8.
[0025] In S40, the CPU 11 determines one power-transmitting device from among one or more power-receiving devices 8 in the vehicle cabin. Specifically, the CPU 11 first extracts power-receiving devices 8 whose battery level is less than or equal to a preset target device determination value, based on one or more battery level information obtained in S30. Then, from among the extracted one or more power-receiving devices 8, the CPU 11 determines that the power-transmitting device is the power-receiving device with the lowest battery level. If there are no power-receiving devices 8 whose battery level is less than or equal to the preset target device determination value, the CPU 11 determines that there is no power-transmitting device.
[0026] In S50, CPU 11 determines whether or not one power transmission target device was determined in S40. If no power transmission target device was determined, CPU 11 proceeds to S130. On the other hand, if one power transmission target device was determined, CPU 11 measures the field strength by inter-antenna communication in S60. Specifically, CPU 11 measures the field strengths of the 1st, 2nd, 3rd, and 4th antennas by performing data communication between the transmitting antenna 31 and transmitting antennas 41, 51, 61, and 71. The 1st antenna field strength is the field strength of the data communication radio waves transmitted between transmitting antennas 31 and 41. The 2nd antenna field strength is the field strength of the data communication radio waves transmitted between transmitting antennas 31 and 51. The 3rd antenna field strength is the field strength of the data communication radio waves transmitted between transmitting antennas 31 and 61. The 4th antenna field strength is the field strength of the data communication radio waves transmitted between transmitting antennas 31 and 71.
[0027] In S70, CPU11 measures the field strength by communication between the antenna and the receiving equipment. Specifically, CPU11 measures the field strengths of the 1st, 2nd, 3rd, 4th, and 5th receiving equipment by performing data communication between the power-transmitting equipment determined in S40 and the power-transmitting antennas 31, 41, 51, 61, and 71. The field strength of the 1st receiving equipment is the field strength of the data communication radio waves transmitted between the power-transmitting equipment and the power-transmitting antenna 31. The field strength of the 2nd receiving equipment is the field strength of the data communication radio waves transmitted between the power-transmitting equipment and the power-transmitting antenna 41. The field strength of the 3rd receiving equipment is the field strength of the data communication radio waves transmitted between the power-transmitting equipment and the power-transmitting antenna 51. The field strength of the 4th receiving equipment is the field strength of the data communication radio waves transmitted between the power-transmitting equipment and the power-transmitting antenna 61. The field strength of the 5th receiving equipment is the field strength of the data communication radio waves transmitted between the power-transmitting equipment and the power-transmitting antenna 71.
[0028] In S80, CPU 11 determines the human body presence region by comparing the electric field strengths of the first, second, third, and fourth antennas measured in S60 with a preset human body detection threshold. Specifically, if the electric field strength of the first antenna is less than or equal to the human body detection threshold, CPU 11 determines the region between the transmitting antenna 31 and the transmitting antenna 41 as the human body presence region. Similarly, if the electric field strength of the second antenna is less than or equal to the human body detection threshold, CPU 11 determines the region between the transmitting antenna 31 and the transmitting antenna 51 as the human body presence region. If the electric field strength of the third antenna is less than or equal to the human body detection threshold, CPU 11 determines the region between the transmitting antenna 31 and the transmitting antenna 61 as the human body presence region. If the electric field strength of the fourth antenna is less than or equal to the human body detection threshold, CPU 11 determines the region between the transmitting antenna 31 and the transmitting antenna 71 as the human body presence region.
[0029] CPU11, in S90, determines the ranking of the electric field strengths of the 1st, 2nd, 3rd, 4th, and 5th powered devices in descending order of electric field strength (hereinafter referred to as the electric field strength ranking). In S100, the CPU 11 selects a designated antenna by referring to the designated antenna selection map MP stored in the ROM 12, based on the human body presence area determined in S80 and the electric field strength ranking determined in S90.
[0030] The designated antenna selection map MP, as shown in Figures 4, 5, 6, 7, and 8, is a map for selecting one designated antenna from among the transmitting antennas 31 to 71 based on the ranking of electric field strengths between the transmitting antennas 31 to 71 and the equipment to be powered, and the area where a human body is present. In Figures 4 to 8, the transmitting antennas 31, 41, 51, 61, and 71 are labeled "A," "B," "C," "D," and "E," respectively.
[0031] Figures 4, 5, 6, 7, and 8 show the designated antenna selection map MP when the electric field strength ranking of the 1st, 2nd, 3rd, 4th, and 5th receiving equipment is 1st (i.e., the electric field strength of the receiving equipment of transmitting antennas 31, 41, 51, 61, and 71 is the maximum).
[0032] In the designated antenna selection map MP in Figures 4 to 8, "AB" indicates that a human body was detected between transmitting antenna 31 and transmitting antenna 41. "AC" indicates that a human body was detected between transmitting antenna 31 and transmitting antenna 51. "AD" indicates that a human body was detected between transmitting antenna 31 and transmitting antenna 61. "AE" indicates that a human body was detected between transmitting antenna 31 and transmitting antenna 71.
[0033] The dashed rectangle RC1 in Figure 4 indicates that the designated antenna is the transmitting antenna 51 when the area where the human body is located is "AB" and the 1st, 2nd, and 3rd ranked electric field strengths are the transmitting antennas 31, 41, and 51, respectively.
[0034] As shown in Figure 9, assume that occupant PS is sitting in the front right seat ST1 inside the passenger compartment VI of vehicle VH. In this case, as indicated by the dashed arrow L1, the electric field strength between the power transmission antenna 31 and the power transmission antenna 41 (i.e., the first antenna electric field strength) is less than or equal to the human body detection threshold. On the other hand, as indicated by the solid arrows L2, L3, and L4, the electric field strength between the power transmission antenna 31 and the power transmission antennas 51, 61, and 71 (i.e., the second, third, and fourth antenna electric field strengths) is greater than the human body detection threshold. Therefore, the region R1 between the power transmission antenna 31 and the power transmission antenna 41 is determined to be the human body presence region.
[0035] Furthermore, with crew member PS seated in the front right seat ST1 holding the power receiving device 8, the ranking of the power receiving device electric field strengths for transmitting antennas 31, 41, 51, 61, and 71 is 1st, 2nd, 3rd, 4th, and 5th, respectively, as indicated by the solid arrows L11, L12, L13, L14, and L15. Arrows L11, L12, L13, L14, and L15 indicate the 1st, 2nd, 3rd, 4th, and 5th power receiving device electric field strengths, respectively. Note that the shorter the length of arrows L11 to L15, the greater the power receiving device electric field strength.
[0036] Therefore, since the first, second, and third highest electric field strengths of the receiving equipment are those of the transmitting antenna 31, transmitting antenna 41, and transmitting antenna 51, respectively, the region where the receiving equipment 8 exists (hereinafter referred to as the equipment presence region) is identified. Region R11 in Figure 9 is the equipment presence region. In other words, in S90, the CPU 11 determines the equipment presence region based on the ranking of the electric field strengths of the receiving equipment.
[0037] The area including the front right seat ST1 is the human body area, and the area to the left of the occupant PS sitting in the front right seat ST1 is the equipment area. Therefore, the power transmission antenna 51 is selected as the designated antenna to supply power to the power receiving equipment 8 while avoiding the occupant PS.
[0038] The dashed rectangle RC2 in Figure 4 indicates that the designated antenna is either the transmitting antenna 61 or the transmitting antenna 71 when the human body region is "AB" and "AC", and the 1st, 2nd, and 3rd ranked electric field strengths are the transmitting antennas 31, 41, and 71, respectively.
[0039] The dashed rectangle RC3 indicates that when the human body is located in the "AB", "AC", "AD", and "AE" regions, and the 1st, 2nd, and 3rd ranked electric field strengths are corresponding to the transmitting antennas 31, 41, and 51, power is transmitted in the second transmission frequency band (920 MHz band in this embodiment). Note that when the human body is located in the "AB", "AC", "AD", and "AE" regions, power is transmitted in the second transmission frequency band regardless of the electric field strength ranking. In other words, no designated antenna is selected.
[0040] The dashed rectangle RC4 in Figure 5 indicates that the designated antenna is the transmitting antenna 41 when the area where the human body is located is "AD" and the 1st, 2nd, and 3rd ranked electric field strengths are the transmitting antennas 41, 51, and 61, respectively.
[0041] The dashed rectangle RC5 in Figure 6 indicates that the designated antenna is the transmitting antenna 51 when the area where the human body is present is "AE" and the 1st, 2nd, and 3rd ranked electric field strengths are the transmitting antennas 51, 31, and 41, respectively.
[0042] The dashed rectangle RC6 in Figure 7 indicates that the designated antenna is the transmitting antenna 61 when the area where the human body is located is "AB" and the 1st, 2nd, and 3rd ranked electric field strengths are the transmitting antennas 61, 31, and 41, respectively.
[0043] The dashed rectangle RC7 in Figure 8 indicates that the designated antenna is the transmitting antenna 71 when the area where the human body is located is "AB" and the 1st, 2nd, and 3rd ranked electric field strengths are the transmitting antennas 71, 31, and 41, respectively.
[0044] When the processing in S100 is completed, the CPU 11 determines in S110 whether or not the designated antenna was selected in S100, as shown in Figure 3. If the designated antenna is not selected, the CPU 11 proceeds to S130. On the other hand, if the designated antenna is selected, the CPU 11 transmits a power transmission radio wave in the first transmission frequency band from the designated antenna selected in S100 in S120, and proceeds to S30 when the transmission of the power transmission radio wave is completed.
[0045] When the process transitions to S130, the CPU 11 transmits a radio wave for power transmission from the power transmission antenna 31 in the second power transmission frequency band, and when the transmission of the radio wave for power transmission is complete, the process transitions to S30. The wireless power transmission system 1 configured in this way includes power transmission antennas 31, 41, 51, 61, and 71, and a control device 2.
[0046] The power transmission antennas 31 to 71 are installed at different locations within the vehicle compartment VI and are configured to communicate wirelessly with each other, and are configured to communicate with at least one power receiving device 8 located within the vehicle compartment VI, and are configured to transmit power to at least one power receiving device 8 by transmitting radio waves to the power receiving device 8.
[0047] The control device 2 is configured to detect the area where a human body is present within the vehicle compartment VI based on the electric field strength in data communication between the power transmission antenna 31 and the power transmission antennas 41, 51, 61, and 71 (i.e., the electric field strengths of antennas 1, 2, 3, and 4).
[0048] The control device 2 is configured to detect the equipment presence area within the vehicle compartment VI where the power receiving equipment 8 is located, based on the electric field strength in data communication between each of the power transmitting antennas 31, 41, 51, 61, and 71 and the power receiving equipment 8 (i.e., the electric field strengths of the 1st, 2nd, 3rd, 4th, and 5th power receiving equipment).
[0049] The control device 2 is configured to select a designated antenna from among the power transmission antennas 31 to 71 that can transmit power to the power receiving device 8 while avoiding the human body, based on the detected human body presence area and the detected equipment presence area.
[0050] This wireless power transmission system 1 detects the position of a person and the position of the power receiving device 8 within the vehicle compartment VI using power transmission antennas 31 to 71, and selects power transmission antennas 31 to 71 that can transmit power to the power receiving device 8 while avoiding the person. Therefore, the wireless power transmission system 1 does not require sensors to detect the position of a person and the position of the power receiving device 8 within the vehicle compartment VI, and the configuration of the wireless power transmission system 1 can be simplified.
[0051] The control device 2 detects the presence of a human body by setting a human body presence region between the two transmitting antennas 31 to 71 corresponding to the first to fourth antenna electric field strengths that are below the human body detection threshold, when the electric field strengths of the first to fourth antennas are below the human body detection threshold.
[0052] The control device 2 detects the area where the equipment is located based on the order of the magnitudes of the electric field strengths of the first to fifth power-receiving equipment. The control device 2 is configured to set the frequency band of the transmitted radio waves transmitted from the designated antenna to a preset first power transmission frequency band (2.4 GHz band in this embodiment) if a designated antenna can be selected, and to set the frequency band of the transmitted radio waves to a preset second power transmission frequency band (920 MHz band in this embodiment) that is lower than the first power transmission frequency band if a designated antenna cannot be selected. Such a wireless power transmission system 1 can switch to a frequency band that does not affect the human body (i.e., the second power transmission frequency band) and transmit power even if it is not possible to transmit power in a frequency band that may affect the human body (i.e., the first power transmission frequency band), thereby suppressing the occurrence of a situation in which the power receiving device 8 becomes unusable due to a low battery level.
[0053] The control device 2 is configured to acquire multiple battery level information indicating the remaining battery capacity of each of the multiple power receiving devices 8 by performing data communication with each of the multiple power receiving devices 8 using the power transmission antennas 31 to 71. Based on the multiple battery level information, the control device 2 is configured to set the power receiving device 8 with the lowest battery level and whose battery level is below a preset target device determination value as the power transmission target device. After setting the transmission frequency band of the radio waves to the first power transmission frequency band, if there are no power receiving devices 8 with a battery level below the target device determination value, the control device 2 sets the transmission frequency band of the radio waves to the second power transmission frequency band.
[0054] Such a wireless power transmission system 1 can concentrate power supply to a powered device 8 with a low battery level using the first transmission frequency band, and when it is sufficiently charged, it can switch to the second transmission frequency band to supply power to multiple powered devices 8 simultaneously.
[0055] In the embodiment described above, the vehicle compartment VI corresponds to a room, the power receiving equipment 8 corresponds to electronic equipment, S60 and S80 correspond to processing as a human body detection unit, S70 and S90 correspond to processing as an equipment detection unit, and S100 corresponds to processing as an antenna selection unit.
[0056] Furthermore, the fact that the electric field strengths of the 1st, 2nd, 3rd, and 4th antennas are below the human body detection threshold corresponds to the human body detection condition, S110 to S130 correspond to processing as a frequency setting unit, S30 corresponds to processing as a remaining information acquisition unit, and S40 corresponds to processing as a target setting unit.
[0057] Although one embodiment of the present disclosure has been described above, the present disclosure is not limited to the above embodiment and can be implemented in various modified forms. [Example 1] For example, in the above embodiment, the power transmission antennas 31 to 71 are shown to be installed inside the vehicle compartment VI, but the power transmission antennas 31 to 71 may also be installed inside a room in a building.
[0058] The control device 2 and its method described in this disclosure may be implemented by a dedicated computer provided by configuring a processor and memory programmed to perform one or more functions embodied by a computer program. Alternatively, the control device 2 and its method described in this disclosure may be implemented by a dedicated computer provided by configuring a processor by one or more dedicated hardware logic circuits. Alternatively, the control device 2 and its method described in this disclosure may be implemented by one or more dedicated computers configured by a combination of a processor and memory programmed to perform one or more functions and a processor configured by one or more hardware logic circuits. Furthermore, the computer program may be stored as instructions executed by the computer on a computer-readable non-transitional tangible recording medium. The method for implementing the functions of each part included in the control device 2 does not necessarily have to include software, and all of its functions may be implemented using one or more hardware components.
[0059] Multiple functions of one component in the above embodiment may be realized by multiple components, or one function of one component may be realized by multiple components. Furthermore, multiple functions of multiple components may be realized by one component, or one function realized by multiple components may be realized by one component. Also, some parts of the configuration of the above embodiment may be omitted. Furthermore, at least some parts of the configuration of the above embodiment may be added to or replaced with the configuration of other above embodiments.
[0060] In addition to the control device 2 described above, this disclosure can also be realized in various forms, such as a system comprising the control device 2, a program for causing the computer to function as the control device 2, a non-transitional physical recording medium such as a semiconductor memory on which this program is recorded, and a wireless power transmission method. [Technical concepts disclosed in this specification] [Item 1] Three or more power transmitting antennas (31, 41, 51, 61, 71) are installed in different locations within a room, configured to enable wireless data communication with each other, and configured to enable data communication with at least one electronic device (8) located in the room, and configured to transmit power to the at least one electronic device by transmitting radio waves to the electronic device, A human body detection unit (S60, S80) is configured to detect a human body presence area in the room based on two or more of the following antenna electric field strengths, using the electric field strength during data communication between any two of the three or more power transmitting antennas as the antenna electric field strength. A device detection unit (S70, S90) is configured to detect a device presence area in the room where the target electronic device is located, using the electric field strength in the data communication between each of the three or more power transmitting antennas and the target electronic device as the device electric field strength, and based on the three or more device electric field strengths, the device detection unit (S70, S90) is configured to detect the device presence area where the target electronic device is located in the room. An antenna selection unit (S100) is configured to select a designated antenna from among the three or more power transmission antennas that is capable of transmitting power to the target electronic device while avoiding the human body, based on the human body presence area detected by the human body detection unit and the device presence area detected by the device detection unit. A wireless power transmission system (1) comprising the following:
[0061] [Item 2] A wireless power transmission system as described in item 1, The aforementioned human body detection unit is a wireless power transmission system that detects a human body presence area by setting a human body presence area between the two power transmission antennas corresponding to the antenna electric field strength at which a preset human body detection condition indicating a low antenna electric field strength is met.
[0062] [Item 3] A wireless power transmission system as described in item 1 or item 2, The aforementioned device detection unit is a wireless power transmission system that detects the device presence area based on the order of magnitudes of three or more of the device electric field strengths.
[0063] [Item 4] A wireless power transmission system as described in items 1 to 3, A wireless power transmission system further comprising a frequency setting unit (S110~S130) configured to set the frequency band of the transmitted radio waves transmitted from the designated antenna to a preset first power transmission frequency band when the antenna selection unit can select the designated antenna, and to set the frequency band of the transmitted radio waves to a preset second power transmission frequency band that is lower than the first power transmission frequency band when the antenna selection unit cannot select the designated antenna.
[0064] [Item 5] A wireless power transmission system as described in item 4, The aforementioned at least one electronic device is a plurality of electronic devices, A remaining charge information acquisition unit (S30) is configured to acquire multiple battery remaining charge information indicating the remaining battery capacity of each of the multiple electronic devices by performing data communication with each of the multiple electronic devices using the three or more power transmitting antennas, A target setting unit (S40) is configured to set the electronic device with the lowest remaining battery charge, based on the aforementioned plurality of battery charge information, and whose remaining charge is less than or equal to a preset target device determination value. Furthermore, A wireless power transmission system in which, after setting the frequency band of the transmitted radio waves to the first power transmission frequency band, if there are no electronic devices whose remaining amount is less than or equal to the target device determination value, the frequency band of the transmitted radio waves is set to the second power transmission frequency band. [Explanation of Symbols]
[0065] 1... Wireless power transmission system, 2... Control device, 8... Power receiving equipment, 31... Power transmission antenna, 31, 41, 51, 61, 71... Power transmission antenna
Claims
1. Three or more power transmitting antennas (31, 41, 51, 61, 71) are installed in different locations within a room, configured to enable wireless data communication between them, and configured to enable data communication with at least one electronic device (8) located within the room, and configured to transmit power to the at least one electronic device by transmitting radio waves to the electronic device. A human body detection unit (S60, S80) is configured to detect a human body presence area in the room based on two or more of the following antenna electric field strengths, using the electric field strength during data communication between any two of the three or more power transmitting antennas as the antenna electric field strength. A device detection unit (S70, S90) is configured to detect a device presence area in the room where the target electronic device is located, based on the three or more device electric field strengths, with the electric field strength in the data communication between each of the three or more power transmitting antennas and the target electronic device being defined as the device electric field strength, among the at least one of the aforementioned electronic devices, which is the target electronic device, and the electric field strength in the data communication between each of the three or more device electric field strengths and the target electronic device, An antenna selection unit (S100) is configured to select a designated antenna from among the three or more power transmission antennas that is capable of transmitting power to the target electronic device while avoiding the human body, based on the human body presence area detected by the human body detection unit and the device presence area detected by the device detection unit. A wireless power transmission system (1) equipped with the following:
2. A wireless power transmission system according to claim 1, The aforementioned human body detection unit is a wireless power transmission system that detects a human body presence area by setting a human body presence area between the two power transmission antennas corresponding to the antenna electric field strength at which a preset human body detection condition indicating that the antenna electric field strength is low is met.
3. A wireless power transmission system according to claim 1 or claim 2, The aforementioned device detection unit is a wireless power transmission system that detects the device presence area based on the order of magnitudes of three or more of the device electric field strengths.
4. A wireless power transmission system according to claim 1 or claim 2, A wireless power transmission system further comprising a frequency setting unit (S110 to S130) configured to set the frequency band of the transmitted radio waves to be transmitted from the designated antenna to a preset first power transmission frequency band when the antenna selection unit can select the designated antenna, and to set the frequency band of the transmitted radio waves to a preset second power transmission frequency band that is lower than the first power transmission frequency band when the antenna selection unit cannot select the designated antenna.
5. A wireless power transmission system according to claim 4, The aforementioned at least one electronic device is a plurality of electronic devices, A remaining charge information acquisition unit (S30) is configured to acquire multiple battery remaining charge information indicating the remaining battery capacity of each of the multiple electronic devices by performing data communication with each of the multiple electronic devices using the three or more power transmitting antennas, A target setting unit (S40) is configured to set the electronic device with the lowest remaining battery charge, based on the aforementioned plurality of battery charge information, and whose remaining charge is less than or equal to a preset target device determination value. Furthermore, A wireless power transmission system in which, after setting the frequency band of the transmitted radio waves to the first power transmission frequency band, if there are no electronic devices whose remaining amount is less than or equal to the target device determination value, the frequency band of the transmitted radio waves is set to the second power transmission frequency band.