TW202007046A - Wireless power supply device and wireless power supply system - Google Patents

Abstract

A wireless power supply device according to the present invention is provided with: a power supply signal generation means for generating a power supply signal; a propagation coefficient calculation means for calculating propagation coefficients between a plurality of antenna elements and an antenna of a power-receiving device; a weight calculation means for calculating, on the basis of the propagation coefficients, a weight for adjusting the phase and the amplitude of the power supply signal generated by the power supply signal generation means for each of the antenna elements; and a power supply signal distribution means for adjusting, on the basis of the weight calculated by the weight calculation means, the phase and the amplitude of the power supply signal generated by the power supply signal generation means for each of the antenna elements, and distributing the adjusted power supply signal to the antenna elements, wherein the antenna elements forming an array antenna convert the power supply signal into a power supply radio wave, and transmit the power supply radio wave to the power-receiving device.

Description

Wireless power supply device and wireless power supply system

The invention relates to a wireless power supply device and a wireless power supply system.

Radio frequency identification (Radio Frequency IDentifier, RFID) technology is used for wireless data communication between RFID tags and RFID readers, or wireless power supply of RFID tags from RFID readers. Furthermore, for wireless data communication or wireless power supply, for example, an array antenna in which a plurality of antenna elements are regularly arranged is provided in an RFID reader.

When radio waves are transmitted from the array antenna for wireless power supply, the power supply waves transmitted from the plurality of antenna elements forming the array antenna may interfere with each other, and the supply power received by the power supply target device may decrease. Therefore, a technique for adjusting the radio waves transmitted from each antenna element is disclosed (for example, Patent Literature 1-Patent Literature 2). [Prior Art Literature] [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open No. 2015-164318 Patent Document 2: Japanese Patent No. 2008-204061

[Problems to be solved by the invention] In Patent Document 1, the phase and amplitude of the radio wave transmitted from each antenna element of the array antenna are searched according to a predetermined search algorithm (algorithm). However, it takes time to perform the search by the search algorithm. Therefore, the throughput decreases, and it takes time to supply power. Moreover, for example, when the propagation environment between the array antenna and the antenna of the power supply target device changes, it is difficult to quickly adjust the radio waves transmitted from each antenna element in response to changes in the propagation environment using the search algorithm. Maintain the reliability of communication.

In Patent Document 2, instead of performing a search based on a search algorithm, a signal from a power supply target device is received, a path difference between the antenna of the power supply target device and each antenna element is detected, and the phase of the power supply signal is adjusted according to the path difference. However, the amplitude of the power supply signal is not controlled. That is, when power supply is performed using the technology disclosed in Patent Document 2, there is a possibility that the power supplied to the power supply target device cannot be maximized, and it is not efficient power supply.

That is, the present inventor found that in the conventional technology, it is impossible to quickly adjust the radio waves transmitted from each antenna element of the array antenna to make it an efficient power supply.

The present invention is completed on the one hand. In view of this fact, the object of the present invention is to provide a technique that can quickly adjust the radio waves transmitted from each antenna element of the array antenna to make it an efficient power supply. [Means to solve the problem]

In order to solve the problem, the present invention adopts the following structure.

That is, a wireless power supply device according to one aspect of the present invention includes an array antenna formed by a plurality of antenna elements. The wireless power supply device includes: a power supply signal generating unit that generates a power supply signal; and a propagation coefficient calculation unit that calculates the multiple antennas Propagation coefficients between the element and the antenna of the power supply target machine; a weight calculation section, based on the propagation coefficients calculated by the propagation coefficient calculation section, used to adjust Weights of the phase and amplitude of the power supply signal generated by each of the antenna elements; and a power supply signal distribution unit, based on the weights calculated by the weight calculation unit, adjusting the power supply signal generation unit for all The phase and amplitude of the power supply signal generated by each of the plurality of antenna elements, and the power supply signal adjusted for each of the plurality of antenna elements are distributed to the plurality of antenna elements to form the array The plurality of antenna elements of the antenna convert the distributed power supply signal into a power supply electric wave, and send the power supply electric wave to the power supply target device.

According to the above configuration, a weight is calculated based on the propagation coefficient between each antenna element of the wireless power supply device and the antenna of the power supply target device, the phase of the power supply signal is adjusted based on the weight, and the power supply signal whose phase is adjusted is assigned to each antenna element. Moreover, the adjustment of the phase is not performed uniformly, but for each of the plurality of antenna elements. In addition, in each antenna element, the power supply signal is converted into a power supply electric wave, and the power supply electric wave is transmitted to a power supply target device. That is, in the above configuration, by adjusting the phase of the power supply signal according to the propagation environment between each antenna element and the antenna of the power supply target device, the power supply waves received by the power supply target device from each antenna element can be set to the same phase. Therefore, this structure can improve the power supply efficiency to the power supply target device.

Moreover, according to the structure, the amplitude of the power supply signal is also adjusted based on the weight. That is, the power supplied from each antenna element to the power supply target device is adjusted. That is, the above configuration can maximize the power supply to the power supply target device according to the propagation environment between each antenna element and the antenna of the power supply target device.

Furthermore, according to the above configuration, the processing for adjusting the phase and amplitude of the power supply signal, such as the calculation of the propagation coefficient or the weight, is performed on the wireless power supply device side rather than the power supply target device side. Here, if it is different from the above-mentioned configuration and the process of adjusting the phase and amplitude of the power supply signal, such as the calculation of the propagation coefficient or the weight, is performed on the power supply target device side, the result calculated on the power supply target device side must be Send to the wireless power supply device side. In addition, in the case of performing such transmission, it is preferable to increase the signal-to-noise ratio (SNR) of the transmitted radio wave. Therefore, it is considered that the power supply target device side performs signal processing such as amplification of the transmission signal or removal of noise included in the transmission signal. Also, these signal processing require power. On the other hand, according to the structure, such signal processing is not required. Therefore, it is possible to reduce power consumption on the power supply target device side. Therefore, the above-mentioned structure is effective when the power supply target device is a device that does not include a battery.

In the wireless power supply device on the one side, a request signal requesting a response from the power supply target device may also be sent to the power supply target device via the plurality of antenna elements forming the array antenna, and passed through The plurality of antenna elements to receive a response signal from the power supply target device for the request signal, and the propagation coefficient calculation unit calculates the plurality of antenna elements and the power supply target based on the received response signal The propagation coefficients between the machine's antennas.

According to the above configuration, when transmitting and receiving radio waves between each antenna element forming the array antenna and the antenna of the power supply target device, the propagation coefficient can be calculated based on the information obtained by the transmission and reception of the radio waves. Therefore, no time or time is required to quickly calculate the propagation coefficient. Therefore, the reduction of the processing amount is suppressed, and the power supply time is reduced.

In the wireless power supply device on the one side, the power supply target device may also send the request signal to the power supply target device whenever the power is supplied to the power supply target device, and from the power supply target for the sent request signal The machine receives the response signal.

According to the above configuration, even when the propagation coefficient between the array antenna and the antenna of the power supply target device changes, it is possible to quickly adjust the power supply radio wave transmitted from each antenna element according to the change in the propagation coefficient. That is, the structure can quickly respond to changes in the propagation environment and suppress a decrease in communication reliability.

The wireless power supply device on the one side may further include: a memory component that sequentially stores the weights calculated by the weight calculation component, when the weight calculation component does not receive the response signal Next, weights are predicted based on a predetermined number of weights stored by the memory section, and the weights calculated based on the propagation coefficient are replaced with the predicted weights.

According to the above configuration, even in the case where the response signal cannot be received and the propagation coefficient cannot be calculated, the weight can be predicted based on the weight calculated in the past and stored by the memory means. In addition, the weights calculated based on the propagation coefficients are replaced with the predicted weights, whereby the phase and amplitude of the power supply signal can be adjusted even when the propagation coefficients cannot be calculated.

In the wireless power supply device on the one side, the prediction of the weight may also be obtained by multiplying the predetermined number of weights stored by the memory component by weight prediction coefficients corresponding to the predetermined number of weights, respectively In the meantime, when the weight calculation unit receives the response signal earlier than when the response signal is not received, in addition to calculating the weight based on the propagation coefficient, it also performs prediction of the weight based on The weight prediction coefficient is updated so that the difference between the calculated weight of the propagation coefficient and the predicted weight becomes the smallest.

According to the above configuration, the weight prediction coefficient is optimized so that the difference between the weight calculated based on the propagation coefficient and the predicted weight becomes the smallest. Therefore, even in the case where the weight cannot be calculated based on the propagation coefficient, the weight prediction coefficient can be used to predict the weight with high accuracy. Moreover, the weight prediction coefficient is updated even when the weight is calculated based on the propagation coefficient. That is, even when the propagation environment changes, the prediction accuracy of the weight can be ensured.

In the wireless power supply device on the one side, the power supply signal generating unit may also generate a power supply signal sent to a plurality of power supply target devices.

According to the above structure, it is possible to supply power to a plurality of power supply target devices at a time. That is, the wireless power supply device is a device with high convenience.

In addition, a wireless power supply system according to one aspect of the present invention may include: a power supply target device having an antenna and a modulation signal generating unit that receives a radio wave from a device outside the system via the antenna To generate a modulation signal that modulates the received radio wave; and a wireless power supply device that is the wireless power supply device on the one side, and the wireless power supply device further includes a demodulation component, the demodulation component When receiving the modulation signal from the power supply target device, the modulation signal is demodulated.

According to the above configuration, when receiving the request signal from the wireless power supply device, the power supply target device generates a modulation signal that modulates the request signal, and sends the modulation signal to the wireless power supply device. In other words, the power supply target device can send a signal to the wireless power supply device without using an oscillator. That is, according to the above-described configuration, the power supply target device does not require power for operating the oscillator, and energy saving can be achieved. In addition, even if the power supply target device does not have a power storage component that stores power for operating the oscillator, it can send a signal to the wireless power supply device, thereby reducing the cost of parts.

Further, according to the above configuration, the propagation coefficient calculation unit calculates the propagation coefficient based on the request signal sent to the power supply target device and the modulation signal received from the power supply target device, and the modulation signal does not adjust the frequency of the request signal In the case of a variable signal, since there is no difference between the frequency of the request signal and the frequency of the modulated signal, the propagation coefficient can be calculated without considering the difference. That is, the propagation coefficient calculation means can easily calculate the propagation coefficient.

In the wireless power supply system on the one side, the power supply target device may further include a power storage component.

According to the above configuration, regardless of the presence or absence of power supply from the wireless power supply device to the power supply target device, the power supply target device can perform processing that requires prescribed power. The processing that requires predetermined power is, for example, when the power supply target device includes an oscillator, processing such as operation of the oscillator, signal amplification, noise removal, and communication with the wireless power supply device.

In the wireless power supply system on the one side, the antenna included in the power supply target device may be formed by a plurality of antenna elements.

According to the above configuration, the propagation path (path) of the radio wave between the wireless power supply device and the power supply target device is increased, and the radio wave propagating through more paths can be concentrated on the power supply target device. Therefore, the power supply efficiency to the power supply target device is improved. [Effect of invention]

According to the present invention, it is possible to provide a technique that can quickly adjust the radio waves transmitted from each antenna element of the array antenna to make it an effective power supply.

Hereinafter, an embodiment of one aspect of the present invention will be described based on drawings (hereinafter also referred to as "this embodiment"). However, the present embodiment described below is merely an illustration of the present invention in all aspects. Of course, various improvements or modifications can be made without departing from the scope of the present invention. That is, in the implementation of the present invention, a specific structure corresponding to the embodiment can also be adopted as appropriate.

§1 Application example An example of a scenario to which the present invention is applied will be described using FIG. 1. FIG. 1 schematically illustrates an example of the outline of the wireless power supply system 1. As shown in FIG. 1, the wireless power supply system 1 includes a power supply device 2 and a power receiving device 51. The power supply device 2 includes an array antenna 3 formed of a plurality of antenna elements 3A. On the other hand, the power receiving device 51 includes an antenna 52.

Moreover, as shown in FIG. 1, the power supply device 2 includes a signal generator 4 that generates a power supply signal. Furthermore, the power supply device 2 includes a propagation coefficient estimation unit 8 that estimates the propagation coefficient H _i of the radio wave between the i-th antenna element 3A of the array antenna 3 and the antenna 52 of the power receiving device 51. Here, the propagation coefficient refers to a coefficient indicating the amount of attenuation and phase change of the radio wave when the radio wave propagates between the transmitting and receiving antennas.

Further, the power supply device 2 comprising a weight calculation unit 9 weight, the weight calculating unit 9 calculates a propagation coefficient H _i phase and the amplitude of the power signal generated in the signal generator 4 for adjusting the weighting W _i. The weight W _i corresponds to each antenna element 3A, and is set in a conjugate relationship with the propagation coefficient H _i .

Furthermore, the power supply device 2 includes a power supply signal distribution unit 11 that multiplies the power supply signal generated in the signal generator 4 by the weight calculated in the weight calculation unit 9 to adjust the phase and amplitude of the power supply signal, And the adjusted power supply signal is distributed to each antenna element 3A.

In addition, the power supply device 2 supplies power to the power receiving device 51 by the operation that each antenna element 3A receives the power supply signal distributed in the power supply signal distribution unit 11 and sends the distributed power supply signal to the power receiving device 51's antenna 52.

That is, the wireless power supply system 1 as described above can appropriately adjust the phase and amplitude of the power supply signal according to the propagation environment between each antenna element 3A included in the power supply device 2 and the antenna 52 of the power receiving device 51 to achieve power supply efficiency Increase or maximize power supply.

§2 Structure example Next, an example of the wireless power supply system of this embodiment will be described. As shown in FIG. 1, the wireless power supply system 1 includes a power supply device 2 and a power receiving device 51. Here, the wireless power supply system 1 is an example of the "wireless power supply system" of the present invention. Furthermore, the power supply device 2 is an example of the "wireless power supply device" of the present invention. In addition, the power receiving device 51 is an example of the "power supply target device" of the present invention. The power supply device 2 is, for example, an RFID reader, and the power receiving device 51 is, for example, an RFID tag. In addition, the power receiving device 51 may be provided with various sensor elements that detect a predetermined physical quantity.

Furthermore, the power supply device 2 includes an array antenna 3. The array antenna 3 is formed by a plurality of antenna elements arranged regularly. Moreover, the power supply device 2 includes a signal generator 4 that generates a power supply signal. Here, the signal generator 4 is an example of the "power supply signal generating means" of the present invention. Furthermore, the power supply device 2 includes a radio frequency (Radio Frequency, RF) transceiver circuit 5 that performs processing of signals transmitted and received via the array antenna 3. In addition, although not shown, the power supply device 2 includes a controller and a memory such as a read-only memory (Read Only Memory, ROM) or a random access memory (Random Access Memory, RAM).

Here, the RF transceiving circuit 5 can perform conversion between a radio frequency (Radio Frequency, RF) signal and a base band (Base Band, BB) signal transmitted and received via the array antenna 3, for example. Furthermore, the RF transceiver circuit 5 also performs analogue/digital (A/D) conversion processing, for example. By such mutual conversion processing, low-speed digital processing can be performed in the power supply device 2. Furthermore, the RF transceiver circuit 5 also performs a process of demodulating the modulated signal when receiving the modulated signal that modulates the carrier wave transmitted from the array antenna 3. Furthermore, the RF transceiver circuit 5 is an example of the "demodulation unit" of the present invention.

As shown in FIG. 1, the power supply device 2 includes a propagation coefficient estimation unit 8 that estimates the propagation coefficient of the radio wave between the antenna element 3A of the array antenna 3 and the antenna 52 of the power receiving device 51. The propagation coefficient estimation unit 8 is an example of the "propagation coefficient calculation means" of the present invention. Here, the propagation coefficient refers to a coefficient indicating the amount of attenuation and phase change of the radio wave when the radio wave propagates between the transmitting and receiving antennas. For example, the propagation coefficient H _i between the i-th antenna element 3A and the antenna 52 is expressed by the following formula (1).

Here, j represents an imaginary unit, γ _i represents the amount of rotation of the phase of the radio wave in the propagation path, and C _i represents the amount of attenuation of the amplitude of the radio wave in the propagation path.

In the present embodiment, the propagation coefficient H _i is estimated based on the following formula (2).

γ_i (k )：由第i個天線元件3A所接收的、來自受電裝置51的接收信號ŝ (k )：過去從受電裝置51收到的接收信號的複本n_i (k )：在連接於第i個天線元件的RF收發電路5中產生的雜訊 k：樣本指標 E[]：[]內的樣本平均計算[Number 1]

γ _i ( k ): received signal from the power receiving device 51 received by the i-th antenna element 3A ŝ ( k ): copy of the received signal received from the power receiving device 51 in the past n _i ( k ): connected to Noise generated in the RF transceiver circuit 5 of the i-th antenna element k: sample index E[]: average calculation of samples in []

In addition, the power supply device 2 includes a weight calculation unit 9 that calculates the phase and amplitude of the power supply signal generated in the signal generator 4 based on the propagation coefficient H _i of the radio wave calculated according to equation (2) The weight W _{i to} be adjusted. Here, the weight calculation unit 9 is an example of the “weight calculation means” of the present invention. The weight W _i is calculated according to the following formula (3).

[Number 2]

Here, m represents the number of times of power supply, and N represents the total number of antenna elements 3A. The weight W _i is set to be conjugated with the propagation coefficient H _i as shown in equation (3). Furthermore, the weight W _i is set to a value obtained by adding up the square of the weight W _i .

Moreover, the power supply device 2 includes a memory section 10 for storing the weight W _i calculated in the weight calculation section 9 to the memory. Here, the memory unit 10 is an example of the "memory component" of the present invention. Furthermore, the power supply device 2 includes a power supply signal distribution unit 11 that multiplies the power supply signal generated in the signal generator 4 by the weight W _i calculated in the weight calculation unit 9 to adjust the phase of the power supply signal and Amplitude and distribute the adjusted power supply signal to each antenna element 3A. Here, the power supply signal distribution unit 11 is an example of the "power supply signal distribution means" of the present invention. The power supply P _i distributed to the i-th antenna element 3A in the power supply signal distribution unit 11 and supplied to the power receiving device 51 is expressed as the following formula (4).

st_x …於信號產生器4中生成的供電信號[Number 3]

st _x … the power supply signal generated in the signal generator 4

The power supply device 2 executes the control program stored in the memory by the controller to realize the array antenna 3, the signal generator 4, the RF transceiver circuit 5, the propagation coefficient estimation unit 8, the weight calculation unit 9, the memory unit 10, Processing in the power supply signal distribution unit 11.

On the other hand, the power receiving device 51 includes an antenna 52. The power receiving device 51 receives the power supply signal transmitted from the power supply device 2 via the antenna 52, thereby receiving power supply. Furthermore, the power receiving device 51 includes an RF transceiver circuit 53.

Furthermore, the RF transceiver circuit 53 provided in the power receiving device 51 includes a receiving end circuit 55 having a switch 54, and performs processing of a power supply signal received from the power supply device 2 via the antenna 52 or processing of a signal transmitted to the power supply device 2. Here, the receiving circuit 55 is an example of the "modulated signal generating means" of the present invention. Furthermore, although not shown, the power receiving device 51 includes a controller and a memory. The controller of the power receiving device 51 does not use its own oscillator to generate the transmission signal. The controller in turn controls the switch of the receiving circuit 55 to open/short the receiving circuit 55, modulate the reception signal received from the power supply device 2, and send the modulated signal to the power supply device 2. In addition, the controller may control the switch of the receiving circuit 55, modulate the received radio wave based on the signal generated or detected in the power receiving device 51, and transmit the modulated signal. In addition, the power receiving device 51 is a batteryless device that does not include a battery.

§3 Action example Next, an operation example of the wireless power supply system 1 will be described. The wireless power supply system 1 executes the control programs stored in the memory of each device by the controller of the power supply device 2 and the controller of the power receiving device 51 to realize the following operations.

FIG. 2 schematically illustrates an example of a flowchart showing the outline of the operation of the wireless power supply system 1. In addition, the processing flow described below is only an example, and each processing can be changed as much as possible. In addition, with regard to the processing flow described below, the omission, replacement, and addition of steps can be appropriately performed according to the embodiment.

(Step S101) As shown in FIG. 2, in step S101, the m-th power supply signal is generated in the signal generator 4. The power supply signal is generated such that its power becomes the upper limit of the limit value prescribed by the radio wave method, for example.

(Step S102) In step S102, in the power supply signal distribution unit 11, the power supply signal generated in the signal generator 4 is multiplied by the weight W _i (m) expressed as Equation (3) to adjust the power supply signal, And the adjusted power supply signal is distributed to each antenna element 3A. For example, the power supply signal is multiplied by the weight W ₁ (m), and the power supply signal obtained by multiplying the weight W ₁ (m) is distributed to the first antenna element 3A. Next, the power supply signal is multiplied by the weight W ₂ (m), and the power supply signal obtained by multiplying the weight W ₂ (m) is distributed to the second antenna element 3A. This distribution of the power supply signal is performed corresponding to each antenna element 3A.

However, in the case of initial power supply (m=1), the wireless power supply system 1 calculates the weight W _i (1) as follows in step S102. FIG. 3 schematically illustrates an example of a detailed flowchart showing the flow of calculating the weight W _i (1) at the initial power supply. In addition, the processing flow described below is only an example, and each processing can be changed as much as possible. In addition, with regard to the processing flow described below, the omission, replacement, and addition of steps can be appropriately performed according to the embodiment.

(Step S102-1) As shown in FIG. 3, in the weight calculation unit 9, the initial value of the weight for assigning the power supply signal to the i-th antenna element 3A is selected from the weight candidate values. Here, the weight candidate value is prepared in advance. Moreover, the selection of the initial value of the weight may be selected randomly or according to a prescribed method.

(Step S102-2) In step S102-2, the power supply signal generated in the signal generator 4 is multiplied by the weight initial value, and the power supply signal obtained by multiplying the weight initial value is distributed to each antenna element 3A. This distribution of the power supply signal is performed corresponding to each antenna element 3A.

(Step S102-3) In step S102-3, the distributed power supply signal is converted to a high frequency in the RF transceiver circuit 5 before reaching the antenna element 3A. Then, in each antenna element 3A, a power supply radio wave is generated from a high frequency, and the power supply radio wave is transmitted to the power receiving device 51, thereby performing power supply.

(Step S102-4) In step S102-4, a signal request from the power supply device 2 to the power receiving device 51 is executed. The signal request is realized by transmitting a carrier wave from each antenna element 3A to the antenna 52 of the power receiving device 51.

On the power receiving device 51 side, the carrier wave transmitted from the power feeding device 2 is received. In the power receiving device 51, the opening and closing of the switch 54 of the receiving side circuit 55 is controlled to open/short the receiving side circuit 55, thereby generating a modulation signal obtained by modulating the received carrier, and adjusting the modulation Variable signal sent to the power supply device 2. FIG. 4 schematically illustrates an example of an outline of a power generation device 51 that generates a modulation signal that modulates a received carrier wave and transmits the modulation signal to the power supply device 2. However, the power receiving device 51 generates a modulation signal that modulates the phase or amplitude of the carrier wave, but does not generate a modulation signal that modulates the frequency of the carrier wave.

(Step S102-5) In step S102-5, the power supply device 2 determines whether or not a signal is received from the power receiving device 51 in response to the signal request to the power receiving device 51 executed in step S102-4.

(Step S102-6) In step S102-6, if it is determined in step S102-5 that the modulated signal of the carrier is received from the power receiving device 51, the propagation coefficient estimation unit 8 estimates each based on equation (2) The propagation coefficient H _i between the antenna element 3A and the antenna 52 of the power receiving device 51. Here, for the reception signal from the power receiving device 51 used in the estimation of the propagation coefficient H _i , the leading part of the reception signal is used. Furthermore, a replica of the received signal received in the past from the power receiving device 51 in equation (2) is generated in advance and stored in the memory. Then, the modulated signal received from the power receiving device 51 is subjected to A/D conversion processing or conversion into a BB signal in the RF transceiver circuit 5 to be demodulated. In addition, although not shown, the estimation of the propagation coefficient is performed in the digital circuit provided in the power supply device 2.

(Step S102-7) In step S102-7, the weight calculation unit 9 calculates the weight W _i (1) based on the propagation coefficient H _i estimated in step S102-6. The method for calculating the weight from the propagation coefficient is based on equation (3).

(Step S102-8) In step S102-8, the memory unit 10 stores the calculated weight W _i (1) in the memory.

(Step S102-9) In step S102-9, if it is determined in step S102-5 that the carrier modulation signal has not been received from the power receiving device 51, it is determined whether all the weight candidate values prepared in advance have been selected . Then, if it is determined that all the weight candidate values have been selected, the initial setting of the weight W _i (1) multiplied by the power supply signal is ended. On the other hand, if it is determined that all the weight candidate values have not been selected, the process returns to step S102-1.

The step S102-1 to the step S102-9 are performed in the step S102 when the power is first supplied.

(Step S103) In step S103, the distributed power supply signal is converted to a high frequency in the RF transceiver circuit 5 before reaching the antenna element 3A. Then, in each antenna element 3A, a power supply radio wave is generated from a high frequency, and the power supply radio wave is transmitted to the power receiving device 51, thereby performing power supply. The power P _i supplied from the i-th antenna element 3A to the power receiving device 51 is expressed as in equation (4).

(Step S104) In step S104, a signal request from the power supply device 2 to the power receiving device 51 is executed. The signal request is realized by transmitting the carrier wave from each antenna element 3A to the antenna 52 of the power receiving device 51.

On the power receiving device 51 side, the carrier wave transmitted from the power feeding device 2 is received. In the power receiving device 51, the opening and closing of the switch 54 of the receiving side circuit 55 is controlled to open/short the receiving side circuit 55, thereby generating a modulation signal obtained by modulating the received carrier, and adjusting the modulation Variable signal sent to the power supply device 2. However, the power receiving device 51 generates a modulation signal that modulates the phase or amplitude of the carrier wave, but does not generate a modulation signal that modulates the frequency of the carrier wave.

(Step S105) In step S105, the power supply device 2 determines whether or not a signal is received from the power receiving device 51 in response to the signal request to the power receiving device 51 executed in step S104.

(Step S106) In step S106, if it is determined in step S105 that the modulated signal of the carrier is received from the power receiving device 51, the propagation coefficient estimation unit 8 estimates each antenna element 3A and the power receiving device based on equation (2) The propagation coefficient H _i (m+1) between the antennas 52 of 51. Here, for the reception signal from the power receiving device 51 used in the estimation of the propagation coefficient H _i , the leading part of the reception signal is used. In addition, a copy of the received signal received in the past from the power receiving device 51 in equation (2) is generated in advance and stored in the memory. Then, the modulated signal received from the power receiving device 51 is subjected to A/D conversion processing or conversion into a BB signal in the RF transceiver circuit 5 to be demodulated. In addition, although not shown, the estimation of the propagation coefficient is performed in the digital circuit provided in the power supply device 2.

(Step S107) In step S107, the weight calculation unit 9 calculates the weight W _i (m+1) based on the propagation coefficient H _i (m+1) estimated in step S106. The method for calculating the weight from the propagation coefficient is based on equation (3).

Further, in step S107, the weight calculation unit 9 does not use the propagation coefficient H _i (m+1) estimated in step S106, but based on the weight W _i estimated in the past and stored in the memory, To calculate the prediction weight W _i '(m+1). The prediction weight W _i '(m+1) is calculated according to the following formula (5).

β_j ：權重預測係數，在每次供電時以預測誤差變得最少的方式進行調整M ：過去的權重的考慮期間[Number 4]

β _j : weight prediction coefficient, adjusted in such a way that the prediction error becomes the smallest every time power is supplied M : past weight consideration period

Here, the weight prediction coefficient β _{j used} in the equation (5) is a coefficient optimized so that the prediction error W _error calculated according to the following equation (6) becomes the smallest, each time power is supplied. [Number 5]

(Step S108) In step S108, if it is determined in step S105 that no signal has been received from the power receiving device 51, the weight W _i (m+1) based on the propagation coefficient H _i (m+1) is not calculated, but only The prediction weight W _i '(m+1) shown in equation (5) is calculated.

(Step S109) In step S109, the calculated weight W _i (m+1) and the predicted weight W _i ′(m+1) are stored in the memory in the memory unit 10. Then, returning to step S101, the m+1th power supply signal is generated in the signal generator 4. And, the steps are repeated. However, if it is determined in step S105 is not the power receiving device 51 receives the modulation signal, will be to the right of the signal generator 4 generates a power supply signal is multiplied replacing each weight prediction weights _{W i '(m + 1)} .

[Effect] In the wireless power supply system 1 as described above, the power supply signal is adjusted by multiplying the power supply signal generated in the signal generator 4 by the weight, and the adjusted power supply signal is distributed to each antenna element 3A. Furthermore, the weight used for the adjustment of the power supply signal is to calculate the propagation coefficient between each antenna element 3A of the power supply device 2 and the antenna 52 of the power receiving device 51 according to equation (2), and to calculate The propagation coefficient of is calculated according to equation (3) in a conjugate manner. Moreover, the adjustment is performed for each antenna element 3A. That is, the power supply device 2 multiplies the power supply signal generated in the signal generator 4 by the weight considering the propagation environment between each antenna element 3A and the power receiving device 51 to adjust the phase of the power supply signal, whereby the power receiving device 51 The power supply waves received by the antenna 52 from the antenna elements 3A of the power supply device 2 are in phase. That is, the wireless power supply system 1 can improve the power supply efficiency to the power receiving device 51.

Furthermore, according to the wireless power supply system 1 as described above, by multiplying the power supply signal by the weight considering the propagation environment, the amplitude of the power supply signal is also adjusted. Then, the adjusted power supply P _i distributed to the i-th antenna element 3A and supplied to the power receiving device 51 is as shown in equation (4), and is multiplied by the square of the amplitude of the power supply signal generated by the signal generator 4 The value obtained by the square of the weight. Here, if the sum of both sides of equation (4) is taken to obtain the sum of the power supplied from each antenna element 3A to the power receiving device 51, the sum of the squares of the weights W _i is 1 (according to equation (3)), so The sum of the supplied power will be equal to the square of the amplitude of the power supply signal generated in the signal generator 4. That is, the wireless power supply system 1 adjusts the amplitude of the power supply signal transmitted via each antenna element 3A so that the supply power generated by the signal generator 4 is directly supplied to the power receiving device 51 without increasing. In addition, the power supply generated by the signal generator 4 is the upper limit of the limit value prescribed by the radio wave method as shown in step S101. In other words, the wireless power supply system 1 generates the maximum power supply that satisfies the radio wave law in the signal generator 4 and supplies the maximum power supply to the power receiving device 51.

In the wireless power supply system 1 described above, a signal request is sent from the power supply device 2 to the power receiving device 51 once, and the propagation coefficient is calculated based on the signal received from the power receiving device 51. Therefore, the propagation coefficient can be quickly calculated. Therefore, the decrease in the processing amount in the power supply device 2 is suppressed, and the power supply time can be reduced.

Moreover, the wireless power supply system 1 as described above makes a signal request from the power supply device 2 to the power receiving device 51 every time power is supplied. Therefore, in the case of the wireless power supply system 1 as described above, even if the propagation environment between the antenna element 3A of the power supply device 2 and the antenna 52 of the power receiving device 51 changes, the change in the propagation environment can be quickly detected Thus, the power supply wave supplied from the antenna element 3A can be adjusted quickly. That is, it is possible to quickly cope with changes in the propagation environment between the power supply device 2 and the antenna 52 of the power receiving device 51, and to suppress a decrease in the communication reliability between the power supply device 2 and the power receiving device 51.

Furthermore, in the wireless power supply system 1 as described above, the processing for adjusting the phase and amplitude of the power supply signal, such as the calculation of the propagation coefficient and the weight, is performed not on the power receiving device 51 but on the power supply device 2 side. Here, if it is different from the wireless power supply system 1 described above, and the process for adjusting the phase and amplitude of the power supply signal, such as the calculation of the propagation coefficient or the weight, is performed on the power receiving device 51 side, the power receiving device 51 must be The result calculated by the side is sent to the power supply device 2 side. In addition, when such transmission is performed, it is preferable to increase the SNR of the transmitted radio wave. Therefore, it is necessary to perform signal processing such as amplification of the transmission signal or removal of noise included in the transmission signal on the power receiving device 51 side. Also, these signal processing require power. On the other hand, according to the wireless power supply system 1 as described above, such signal processing is not required. Therefore, power consumption on the power receiving device 51 side can be reduced. Therefore, the wireless power supply system 1 as described above is of course an effective system when the power receiving device 51 is a device without a battery.

Moreover, in the case of the wireless power supply system 1 as described above, even if the communication between the power supply device 2 and the power receiving device 51 is interrupted and the request signal from the power supply device 2 cannot receive the signal from the power receiving device 51, the propagation cannot be calculated. In the case of coefficients, the weights calculated in the past and stored in memory can still be used to predict the weights. Furthermore, the predicted weights can be used to adjust the phase and amplitude of the power supply signal.

Furthermore, in the case of the wireless power supply system 1 as described above, the weight prediction coefficient β _j is optimized so that the prediction error W _error is minimized every time power is supplied. Therefore, even when the signal from the power receiving device 51 cannot be received for the request signal from the power supply device 2 and the propagation coefficient cannot be calculated, the weight prediction coefficient β _j can be used to calculate the prediction weight W _i ′ with high accuracy (M+1). Moreover, even when the propagation environment changes, since the weight prediction coefficient β _j is optimized every time, the accuracy of the prediction weight W _i ′(m+1) can be ensured.

In addition, the power receiving device 51 modulates the carrier wave transmitted from the power supply device 2 by opening and closing the switch 54 of the receiving circuit 55 in response to the signal request from the power supply device 2 and sends the modulation signal to the power supply device 2 . This signal transmission method can transmit a signal to the power supply device 2 without using an oscillator, so energy saving can be achieved. Furthermore, even if the power receiving device 51 is a device without a battery or a device without an oscillator, this signal transmission method can transmit a modulation signal in response to a request signal to the power supply device 2. Therefore, the signal transmission method is a signal transmission method with high convenience.

Furthermore, in the signal transmission method described above, when the power receiving device 51 includes various sensor elements that detect a predetermined physical quantity, the power receiving device 51 can be controlled based on a signal corresponding to the predetermined physical quantity detected by the sensor element The switch 54 of the receiving circuit 55 is opened and closed to generate a modulation signal that modulates the carrier wave received from the power supply device 2. That is, when the power receiving device 51 responds to the power supply device 2, it may send the information detected by the sensor provided with it along with the response signal. That is, the wireless power supply system 1 as described above is a system that can save time and effort for transmitting the information detected by the sensor to the power supply device 2 when the power receiving device 51 includes a sensor element.

Furthermore, the power supply device 2 receives the modulation signal having the same frequency as the frequency of the carrier wave from the power receiving device 51. Therefore, when calculating the propagation coefficient, the power supply device 2 does not need to consider the difference between the frequency of the carrier wave and the frequency of the modulation signal. That is, the propagation coefficient can be easily estimated.

Furthermore, the wireless power supply system 1 as described above uses the preamble of the received signal from the power receiving device 51 when estimating the propagation coefficient. Therefore, the wireless power supply system 1 does not need to implement new processing on the existing communication protocol (protocol), but can easily estimate the propagation coefficient.

§4 Variation Although the embodiments of the present invention have been described in detail above, the descriptions up to the foregoing are merely examples of the present invention in all aspects. Of course, various improvements or modifications can be made without departing from the scope of the present invention. For example, the following changes can be made. In the following, the same reference numerals are used for the same constituent elements as in the above-mentioned embodiment, and the description of the same points as in the above-mentioned embodiment will be appropriately omitted. The following modifications can be combined as appropriate.

<4.1> In the wireless power supply system 1, the power receiving device 51 may include a battery. Here, the battery is an example of the "electric storage component" of the present invention. In addition, in step S102-4 or step S104, when the power receiving device 51 receives a signal request from the power supply device 2, the power receiving device 51 does not generate and transmit a modulation signal that modulates the carrier wave received from the power supply device 2, Instead, a signal is generated in an oscillator built in its own controller and sent to the power supply device 2. Here, if the oscillator of the signal generator 4 of the power supply device 2 and the oscillator of the power receiving device 51 generate signals of different frequencies, the frequency of the radio wave of the request signal sent from the power supply device 2 to the power receiving device 51 and the request signal On the other hand, the frequency of the radio wave transmitted from the power receiving device 51 to the power feeding device 2 will be different. In addition, if the frequency of the radio wave transmitted from the power feeding device 2 to the power receiving device 51 is different from the frequency of the radio wave transmitted from the power receiving device 51 to the power feeding device 2, the propagation coefficient estimation unit 8 may replace equation (2) based on To estimate the propagation coefficient H _i between the array antenna 3 and the antenna 52 of the power receiving device 51. FIG. 5 schematically illustrates an example of a flowchart showing a flow of estimating the propagation coefficient H _i . In addition, the guess flow described below is an example, and each process can be changed as much as possible. In addition, with regard to the estimation flow described below, the omission, replacement, and addition of steps can be appropriately performed according to the embodiment.

(Step S201) In step S201, the propagation coefficient estimation unit 8 extracts the leading portion of the signal input from the RF transceiver circuit 5 of the power supply device 2 to the i-th antenna element 3A. Then, the phase θ _i (k) and the amplitude A _i (k) of the leading part are obtained. FIG. 6 schematically illustrates an example of the phase θ _i (k) obtained from the preamble. Furthermore, FIG. 7 schematically illustrates an example of the amplitude A _i (k) obtained from the preamble. Here, i is the index of the antenna element 3A, and k is the sample index of the extracted leading part.

(Step S202) In step S202, the propagation coefficient estimation unit 8 calculates the phase γ _i of the propagation coefficient H _i expressed as Equation (1). Here, it is known that the relationship of the following formula (7) holds between the phase θ _i (k) and the phase γ _{i of the} propagation coefficient H _i .

Δf ：從供電裝置2發送至受電裝置51的電波的頻率、與從受電裝置51發送至供電裝置2的電波的頻率之差F_s ：前導部分的採樣頻率n'_i (k )：相位θ_i (k )的雜訊[Number 6]

Δ f : the difference between the frequency of the radio wave sent from the power supply device 2 to the power receiving device 51 and the frequency of the radio wave sent from the power receiving device 51 to the power supply device 2 F _s : sampling frequency of the leading part n′ _i ( k ): phase θ noise of _i ( k )

Therefore, the propagation coefficient estimation unit 8 can generate a regression line related to k of the phase θ _i (k) based on the data shown in FIG. 6 and use the regression line to calculate the phase γ _i .

(Step S203) In step S203, the propagation coefficient estimation unit 8 calculates the amplitude C _i of the propagation coefficient H _i expressed as Equation (1). Here, it is known that the relationship of the following formula (8) holds between the amplitude A _i (k) of the leading part and the amplitude C _{i of the} propagation coefficient H _i .

s (k )：從受電裝置51收到的接收信號

：第i個RF收發電路5中的雜訊[Number 7]

s ( k ): received signal received from the power receiving device 51

: Noise in the i-th RF transceiver circuit 5

In addition, if the noise is regarded as, for example, noise that is uniformly distributed around 0, the amplitude C _i can be easily calculated according to the following equation (9).

[Number 8]

Therefore, the propagation coefficient estimation unit 8 can calculate the amplitude C _i by substituting the data shown in FIG. 7 into equation (9).

[Effect] In such a wireless power supply system, even when power is not supplied from the power supply device 2 to the power receiving device 51, the power receiving device 51 can perform a process that requires predetermined power to operate an oscillator, amplify a signal, and remove noise. Furthermore, communication can be performed between the power supply device 2 and the power receiving device 51. Furthermore, the power supply device 2 will receive response signals at a different frequency from the request signal from the power receiving device 51, but the propagation coefficient can be estimated from Equations (7) and (9). That is, such a wireless power supply system is a highly convenient system in which, even for the power receiving device 51 that emits response signals of various frequencies, it is possible to estimate the propagation coefficient to adjust the power supply signal.

＜4.2＞ In addition, the antenna 52 of the power receiving device 51 of the wireless power supply system 1 may be an array antenna formed of a plurality of antenna elements 52A. FIG. 8 schematically illustrates an example of the outline of the wireless power supply system 1 including the power receiving device 51 including a plurality of antenna elements 52A. In the case of the power receiving device 51 shown in FIG. 8, the RF transceiver circuit 53 is provided so as to correspond to each of the plurality of antenna elements 52A. Furthermore, in the wireless power feeding system shown in FIG. 8, the propagation coefficient is estimated by the number of combinations of each antenna element 3A of the power feeding device 2 and each antenna element 52A of the power receiving device 51. Then, based on the propagation coefficient, the power supply signal transmitted from each antenna element 3A of the power feeding device 2 to each antenna element 52A of the power receiving device 51 is adjusted.

[Effect] In the wireless power supply system 1 described above, the propagation path (path) of the radio waves between the power supply device 2 and the power receiving device 51 is increased, and the radio waves propagating through more paths can be concentrated on the power receiving device 51. Therefore, the power supply efficiency to the power receiving device 51 is improved.

＜4.3＞ In addition, the power supply device 2 of the wireless power supply system 1 may supply power to a plurality of power receiving devices 51. FIG. 9 schematically illustrates an example of the outline of the wireless power supply system 1 that supplies power to the plurality of power receiving devices 51. Here, the antenna 52 included in each power receiving device 51 may be a single antenna, or may be an array antenna formed of a plurality of antenna elements as in the modification <4.2>. Furthermore, in the wireless power feeding system shown in FIG. 9, the propagation coefficient is estimated from the number of combinations of each antenna element 3A of the power feeding device 2 and each antenna element of each power receiving device 51. Then, a weight is calculated based on the propagation coefficient, and based on the weight, the power supply signal transmitted from each antenna element 3A of the power feeding device 2 to each antenna element 52A of each power receiving device 51 is adjusted.

[Effect] The wireless power supply system 1 described above is a highly convenient system that can supply power to a plurality of power receiving devices 51.

Furthermore, in the RF transceiver circuit 5 of the power supply device 2 or the RF transceiver circuit 53 of the power receiving device 51, the RF signal and the BB signal may not be converted to each other, but the RF may be converted by high-speed A/D conversion processing. The signal is directly A/D converted. In such a wireless power supply system 1, it is possible to reduce the number of circuits that perform the conversion processing between the RF signal and the BB signal, and to reduce the size of the RF transceiver circuit. Therefore, the power supply device 2 or the power receiving device 51 can be miniaturized. Moreover, the cost of parts can also be reduced.

Furthermore, in the power supply device 2 of the wireless power supply system 1, the estimation of the propagation coefficient is performed in a digital circuit, but the estimation of the propagation coefficient may also be performed in an analog circuit. In such a wireless power supply system 1, the propagation coefficient can be directly estimated without the A/D conversion process from the RF signal received at the antenna and used to estimate the propagation coefficient. Therefore, the estimation of the propagation coefficient can be performed more easily.

The embodiments or modifications disclosed above can be combined separately.

In addition, in the following, in order to compare the constitutional requirements of the present invention with the structures of the embodiments, the symbols of the drawings are attached to describe the constitutional requirements of the present invention. <Invention 1> A wireless power supply device (2) including an array antenna (3) formed of a plurality of antenna elements (3A), the wireless power supply device (2) including: a power supply signal generating part (4) that generates Power supply signal; Propagation coefficient calculation unit (8), which calculates each propagation coefficient between the plurality of antenna elements (3A) and the antenna (52) of the power supply target device (51); Weight calculation unit (9), based on The propagation coefficients calculated by the propagation coefficient calculation section (8) are used to adjust the power supply generated by the power supply signal generation section (4) for each of the plurality of antenna elements (3A) Weights of the phase and amplitude of the signal; and a power supply signal distribution unit (11), based on the weights calculated by the weight calculation unit (9), adjusting the power supply signal generation unit (4) for the plurality of The phase and amplitude of the power supply signal generated by each of the antenna elements (3A), and the power supply signal adjusted for each of the plurality of antenna elements (3A) is distributed to the plurality of antenna elements ( 3A), the plurality of antenna elements (3A) forming the array antenna (3) convert the distributed power supply signal into a power supply electric wave, and send the power supply electric wave to the power supply target device (51). <Invention 2> The wireless power supply device (2) according to Invention 1, wherein a request signal requesting a response from the power supply target device (51) is passed through the plurality of antenna elements forming the array antenna (3) ( 3A) sent to the power supply target device (51), and receives the response signal from the power supply target device (51) for the request signal via the plurality of antenna elements (3A), the propagation The coefficient calculation unit (8) calculates each propagation coefficient between the plurality of antenna elements (3A) and the antenna (52) of the power supply target device (51) based on the received response signal. <Invention 3> The wireless power supply device (2) according to Invention 2, wherein each time power is supplied to the power supply target device (51), the request signal is sent to the power supply target device (51), and The transmitted request signal receives the response signal from the power supply target device (51). <Invention 4> The wireless power supply device (2) according to Invention 2 or 3, further comprising: a memory section (10) that sequentially stores the weights calculated by the weight calculation section (9), the weights The calculation unit (9) predicts weights based on a predetermined number of weights stored by the memory unit (10) without receiving the response signal, and uses the predicted weights instead of based on the propagation Coefficients to calculate the weight. <Invention 5> The wireless power supply device (2) according to Invention 4, wherein the prediction of the weight is obtained by multiplying the predetermined number of weights stored by the memory unit (10) by the predetermined number of times A number of weights are performed corresponding to the weight prediction coefficients, and the weight calculation unit (9) receives the response signal earlier than when the response signal is not received, except for calculating the weight based on the propagation coefficient In addition, the weight prediction is performed, and the weight prediction coefficient is updated so that the difference between the calculated weight of the propagation coefficient and the predicted weight becomes the smallest. <Invention 6> The wireless power supply device (2) according to Invention 1, wherein the power supply signal generating section (4) generates a power supply signal transmitted to a plurality of power supply target devices (51). <Invention 7> A wireless power supply system (1), comprising: a power supply target device (51), having an antenna (52) and a modulation signal generating part (55), the modulation signal generating part (55) is passing through When the antenna (52) receives radio waves from a machine outside the system, it generates a modulation signal that modulates the received radio waves; and the wireless power supply device (2) is any one of inventions 1 to 6. The wireless power supply device (2) described above, and the wireless power supply device (2) further includes a demodulation unit (5), the demodulation unit (5) receives the modulation from the power supply target device (51) When changing the signal, demodulate the modulated signal. <Invention 8> The wireless power supply system (1) according to Invention 7, wherein the power supply target device (51) further includes a power storage component. <Invention 9> The wireless power supply system (1) according to Invention 7 or 8, wherein the antenna (52) included in the power supply target device (51) is formed of a plurality of antenna elements (52A).

1‧‧‧Wireless power supply system 2‧‧‧Power supply device 3‧‧‧Array antenna 3A‧‧‧Antenna element 4‧‧‧Signal generator 5‧‧‧RF transceiver circuit 8‧‧‧Propagation coefficient estimation unit 9‧‧ ‧Weight calculation part 10‧‧‧Memory part 11‧‧‧Power supply signal distribution part 51‧‧‧Power receiving device 52‧‧‧Antenna 52A‧‧‧Antenna element 53‧‧‧RF transceiver circuit 54‧‧‧Switch 55‧‧ ‧Receiving circuit

FIG. 1 schematically illustrates an example of the outline of a wireless power supply system. FIG. 2 schematically illustrates an example of a flowchart showing an outline of the operation of the wireless power supply system. FIG. 3 schematically illustrates an example of a detailed flowchart showing the flow when power is supplied for the first time and the power supply signal is distributed. FIG. 4 schematically illustrates an example of an outline of a power generation device that generates a modulation signal that modulates a received carrier and transmits the modulation signal to a power supply device. FIG. 5 schematically illustrates an example of a flowchart showing a flow of estimating a propagation coefficient. FIG. 6 schematically illustrates an example of the phase obtained from the preamble. FIG. 7 schematically illustrates an example of the amplitude obtained from the leading part. FIG. 8 schematically illustrates an example of the outline of a wireless power supply system including a power receiving device including a plurality of antenna elements. FIG. 9 schematically illustrates an example of the outline of a wireless power supply system that simultaneously supplies power to a plurality of power receiving devices.

1‧‧‧Wireless power supply system

2‧‧‧Power supply device

3‧‧‧Array antenna

3A‧‧‧Antenna element

4‧‧‧Signal generator

5‧‧‧RF transceiver circuit

8‧‧‧Propagation coefficient estimation department

9‧‧‧ Weight Calculation Department

10‧‧‧ Memory Department

11‧‧‧Power Supply Signal Distribution Department

51‧‧‧Power receiving device

52‧‧‧ Antenna

53‧‧‧RF transceiver circuit

54‧‧‧Switch

55‧‧‧Receiving circuit

Claims (9)

A wireless power supply device includes an array antenna formed by multiple antenna elements. The wireless power supply device includes: A power supply signal generating unit that generates a power supply signal; a propagation coefficient calculation unit that calculates each propagation coefficient between the plurality of antenna elements and the antenna of the power supply target machine; a weight calculation unit that is based on the calculation of the propagation coefficient calculation unit The propagation coefficients to calculate weights for adjusting the phase and amplitude of the power supply signal generated by the power supply signal generating means for each of the plurality of antenna elements; and the power supply signal distributing means based on The weight calculated by the weight calculation unit adjusts the phase and amplitude of the power supply signal generated by the power supply signal generation unit for each of the plurality of antenna elements, and adjusts the Each adjusted power supply signal is distributed to the plurality of antenna elements, and the plurality of antenna elements forming the array antenna converts the distributed power supply signal into a power supply wave and sends the power supply wave to the Describe the power supply target device. The wireless power supply device as described in item 1 of the patent application scope, in which A request signal requesting a response from the power supply target machine is transmitted to the power supply target machine via the plurality of antenna elements forming the array antenna, and the request signal for the request signal is received via the plurality of antenna elements 2. A response signal from the power supply target machine, and the propagation coefficient calculation unit calculates each propagation coefficient between the plurality of antenna elements and the antenna of the power supply target machine based on the received response signal. The wireless power supply device according to item 2 of the patent application scope, in which Whenever power is supplied to the power supply target device, the request signal is sent to the power supply target device, and the response signal is received from the power supply target device for the transmitted request signal. The wireless power supply device as described in item 2 or item 3 of the scope of patent application also includes: The memory component sequentially stores the weights calculated by the weight calculation component, and the weight calculation component is based on a predetermined number of weights stored by the memory component without receiving the response signal To predict the weight, use the predicted weight instead of the weight calculated based on the propagation coefficient. The wireless power supply device as described in item 4 of the patent application scope, in which The prediction of the weight is performed by multiplying the weight of the prescribed number of times stored by the memory unit by the weight prediction coefficient corresponding to the weight of the prescribed number of times, respectively. When the response signal is not received earlier, when the response signal is received earlier, in addition to calculating the weight based on the propagation coefficient, the prediction of the weight is also performed to determine the weight based on the calculated weight of the propagation coefficient, The weight prediction coefficient is updated so that the difference from the predicted weight becomes the smallest. The wireless power supply device as described in item 1 of the patent application scope, in which The power supply signal generating unit generates a power supply signal sent to a plurality of power supply target devices. A wireless power supply system, including: The power supply target device includes an antenna and a modulation signal generating unit that generates a modulation that modulates the received radio wave when receiving the radio wave from a device outside the system via the antenna Variable signal; and a wireless power supply device, which is the wireless power supply device according to any one of claims 1 to 6, and the wireless power supply device further includes a demodulation component When the power supply target device receives the modulation signal, it demodulates the modulation signal. The wireless power supply system as described in item 7 of the patent application scope, in which The power supply target device further includes a power storage component. The wireless power supply system as described in item 7 or item 8 of the patent application scope, in which The antenna included in the power supply target device is formed of a plurality of antenna elements.

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