JP5310659B2 - Wireless power transmission system, rectenna base station, and power transmission apparatus - Google Patents

Description

  The present invention relates to a wireless power transmission system that receives sunlight and performs photoelectric conversion, transmits microwaves generated based on the obtained power from a plurality of transmitting devices, and receives the received power by receiving devices to generate power. The present invention relates to a rectenna base station and a power transmission device.

  For example, Patent Document 1 describes a conventional wireless power transmission system in which microwaves are transmitted from a plurality of power transmission apparatuses to a rectenna base station and received by the rectenna base station to generate power. In this conventional wireless power transmission system, the rectenna base station has a rectenna that receives microwaves, a pilot signal transmission antenna that transmits a pilot signal to the power transmission device, and a power value received by the rectenna so that the power value received by the rectenna increases. The phase monitoring control unit generates a command signal for changing the phase of the power transmission device by designating the identification code of the transmission device. Further, the power transmission device detects a plurality of transmission antenna elements that transmit microwaves to the rectenna base station, a pilot signal reception antenna that receives a pilot signal, and an arrival direction of a pilot signal received by the pilot signal reception antenna. From a tracking receiver, a beam drive control unit that adjusts the phase so that the directions of microwaves transmitted from a plurality of transmission antenna elements are directed in the direction of arrival of pilot signals detected by the tracking receiver, and a phase monitoring control unit And a phase controller that changes the phase of the microwave when the identification code matches the stored identification code.

JP 2010-004324 A

  The conventional wireless power transmission system described in Patent Document 1 discloses a procedure for resetting the phase of the power transmission device when the power of the microwave received by the rectenna base station is lower than the threshold. The method is to sequentially change the phase of all the power transmission devices and repeat until the best amount of power is obtained, and phase adjustment takes time, resulting in degradation of transmission efficiency. There is also a problem that it is not possible to cope with a phase fluctuation element having a high frequency or a phase having a high frequency. In addition, in the phase adjustment of each power transmission device, not all the power transmission devices are treated as equivalent, but by providing a certain reference, the stability of the phase adjustment is increased and the convergence of the microwave beam is increased. It has been a problem to devise a phase adjustment method that can be used. In addition, there is a problem in that the phase adjustment accuracy changes due to a change in solar energy received on the power transmission device side.

  The present invention has been made to solve the above-described problems and problems, and by performing phase adjustment in the power transmission device in a short time, the power transmission efficiency is good, and it also supports relatively high-frequency fluctuation elements. It is another object of the present invention to provide a wireless power transmission system, a rectenna base station, and a power transmission apparatus that can perform the microwave beam convergence.

A wireless power transmission system according to the present invention is a wireless power transmission system in which a microwave is transmitted from a power transmission device to a rectenna base station, and is received by the rectenna base station to generate power. The power transmission device transmits A reference power transmission panel serving as a reference for the phase of the microwave, and a plurality of power transmission panels other than the reference transmission panel, wherein the rectenna base station transmits the microwaves transmitted from the reference power transmission panel and the plurality of power transmission panels. And a phase control unit that generates a phase control signal for changing the phase of the plurality of power transmission panels. The phase control unit includes: About 1 of the power transmission panel, the phase of the transmission microwave is changed one stage, the reference transmission panel and the transmission phases of microwaves is changed one stage The phase of the transmission panel is changed one stage the phase of the transmitted microwaves in the case of power transmission efficiency of the microwave transmitted from the plurality of power transmission panel is improved and remains fully including power panel, the reference When the power transmission efficiency of the microwaves transmitted from the plurality of power transmission panels including the power transmission panel and the power transmission panel in which the phase of the transmission microwave is changed by one stage is not improved, phase adjustment is performed to return to the phase before the change. Then, the phase adjustment is sequentially performed on the plurality of power transmission panels by performing the phase adjustment on two power transmission panels among the plurality of power transmission panels. In addition, the phase control unit can be provided on the power transmission device side.

According to the present invention, the phase control unit changes the phase of the transmission microwave by one stage and changes the phase of the reference power transmission panel and the transmission microwave by one stage with respect to one of the plurality of power transmission panels. If the transmission efficiency of microwaves transmitted from a plurality of transmission panels including the transmitted transmission panel is improved, leave the phase as it is, and if the transmission efficiency is not improved, adjust the phase to return to the phase before the change, After that, by performing phase adjustment on two of the plurality of power transmission panels, the phase adjustment is sequentially performed on the plurality of power transmission panels, so that the phase adjustment can be performed in a short time. Therefore, it is effective for correcting a phase shift of a higher frequency of the power transmission panel.

It is a block diagram showing the whole structure of the wireless power transmission system which concerns on Embodiment 1 of this invention. It is a process flowchart showing the phase control process in the wireless power transmission system concerning Embodiment 1 of this invention. It is a schematic diagram which shows one model of the power transmission panel, and its beam pattern. It is a schematic diagram which shows the random phase error to provide and power transmission intensity improvement by phase adjustment. It is a block diagram showing the whole structure of the wireless power transmission system which concerns on Embodiment 2 of this invention. It is a process flowchart showing the phase control process in the wireless power transmission system concerning Embodiment 2 of this invention. It is a block diagram showing the whole structure of the wireless power transmission system which concerns on Embodiment 3 of this invention. It is a block diagram showing the structure of the phase control part provided in the wireless power transmission system which concerns on Embodiment 4 of this invention.

  Embodiment 1

  A wireless power transmission system, a rectenna base station, and a power transmission apparatus according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 is a block diagram showing the overall configuration of a wireless power transmission system according to Embodiment 1 of the present invention. FIG. 1A shows a configuration in which power transmission apparatuses are combined and FIG. 1B shows a configuration in which power transmission apparatuses are discretely arranged. In FIG. 1 (a), 1 is a power transmission device and 2 is a rectenna base station. In the power transmission apparatus 1, 3 is a reference power transmission panel, 4 is a power transmission panel other than the reference power transmission panel 3, 5 is a structure to which the reference power transmission panel 3 and the power transmission panel 4 are coupled, and 6 is a rectenna base station 2. A communication unit 7 is a control unit. The control unit 7 includes a reference signal source, supplies a reference signal to each reference power transmission panel 3 and the power transmission panel 4, and includes a signal processing circuit for a control signal transmitted and received via the communication unit 6. The power transmission device 1 is mounted on a flying object such as an artificial satellite or an airship, and inputs position and orientation information from the position and orientation control circuit 8 of the flying object to the control unit 7. In FIG. 1A, the power transmission panel includes four reference power transmission panels and other power transmission panels, but this number is not limited to four. In the discrete arrangement type of FIG. 1B, the reference power transmission panel 3 and the power transmission panel 4 are mounted on a plurality of power generation satellites arranged in outer space, respectively, and the communication unit 6 and the control unit 7 are mounted on the control satellite. The power transmission device is configured to supply a reference signal and a control signal from the control satellite to each power generation satellite. Hereinafter, each embodiment will be described mainly based on the configuration of FIG. 1A, but the same applies to the configuration of FIG.

  In the rectenna base station 2, 9 is a rectenna that receives microwaves from the reference power transmission panel 3 and the power transmission panel 4 of the power transmission device 1 and generates power by rectifying and synthesizing. 10 is a microwave received by the rectenna 9. It is a phase control part which produces | generates the control signal for controlling the phase of the reference | standard power transmission panel 3 and the power transmission panel 4 based on received power information, such as an amplitude and phase of RF signal of this, and received power value. Reference numeral 11 denotes a communication unit that transmits and receives control signals to and from the power transmission device 1.

  Next, the operation will be described. In the reference power transmission panel 3 and each power transmission panel 4, the phase of the high-frequency reference signal is adjusted by a phase shifter provided for each panel based on the control signal from the control unit 7. The phase-adjusted high-frequency signal is distributed by a distribution circuit in each panel, then amplified by an amplifier, and radiated into the space from antenna elements arranged in an array on the front surface of the panel. Electric power for driving the amplifier is obtained by converting solar energy into electric power by a photoelectric conversion unit (not shown). By aligning the phases of the microwaves transmitted from the reference power transmission panel 3 and each power transmission panel 4 to the rectenna base station 2, the energy of the transmitted electromagnetic waves converges to form a microwave beam, which is effective for the rectenna base station 2. Can be transmitted.

  The phase control of each power transmission panel is performed based on the received power information output from the rectenna 9 to the phase control unit 10, and the phase control signal output from the phase control unit 10 is transmitted from the communication unit 11, and the power transmission device Received by the communication unit 6 on the first side. The received power information output from the rectenna 9 is multiplied by a fluctuation component of the generated power from sunlight in the power transmission device 1. When the fluctuation component of the generated power is large, the generated power information in the power transmission device 1 is transmitted to the power transmission device 1 side by the communication unit 6 so that the received power becomes dominant due to the phase setting of each power transmission panel. To the rectenna base station 2 side. The phase control unit 10 subtracts the received power information from the generated power information to calculate a loss amount related to power transmission, and sets the phase of each power transmission panel so that power transmission efficiency = rectenna received power / power generation amount is maximized. adjust. When the fluctuation component of the generated power is small, the power transmission efficiency may be changed using the received power.

  Next, a phase control method performed by the phase control unit 10 will be described. First, each power transmission panel of the power transmission device 1 is classified into the reference power transmission panel 3 and the other power transmission panels 4 to perform phase control. Considering the motion of an artificial satellite or other flying object on which the power transmission device 1 is mounted, the attitude of the flying object changes as a whole to cause rotational displacement, and the position of each power transmission panel changes with this rotational displacement. It is conceivable that the phases of the microwaves transmitted from each power transmission panel are shifted. Therefore, a power transmission panel that is located near the center of gravity of the flying object on which the power transmission device 1 is mounted and that can be structurally and more firmly supported than other panels is referred to as a reference power transmission panel 3. By using this reference power transmission panel 3 as a reference for the phase of the microwaves and adjusting the phase of the other power transmission panel 4 with respect to the reference power transmission panel 3, stable phase control can be performed. However, when all the power transmission panels are mounted on independent flying bodies, any panel may be defined as the reference power transmission panel.

  The reference power transmission panel 3 as a phase reference does not need to be changed in phase for phase adjustment, but the position and orientation information from the position and orientation control circuit 8 included in the flying object is longer than the phase update period of all the power transmission panels. The phase control unit 10 calculates a relative position change amount of the reference power transmission panel 3 that fluctuates in a short cycle with the rectenna 9 so that the transmission power microwaves from the reference power transmission panel 3 do not fluctuate in phase. Perform phase adjustment. By adjusting the phase of the reference power transmission panel 3, errors in phase adjustment of other power transmission panels 4 can be suppressed and the phase adjustment accuracy can be improved. Here, in order to convert the position change amount of the reference power transmission panel 3 into the phase of the power transmission microwave, the position change amount may be divided by the wavelength of the microwave. The position and orientation information is transmitted from the communication unit 6 of the power transmission device 1, received by the communication unit 11 of the rectenna base station 2, and input to the phase control unit 10. Similarly, in the power transmission panels 4 other than the reference power transmission panel 3, by compensating for short cycle fluctuations, it is possible to suppress phase adjustment errors and improve phase adjustment accuracy. When the information of the position / orientation control circuit 8 cannot be obtained, or when the variation of the position and orientation is small, the compensation control may not be performed without using the position / orientation information.

  FIG. 2 is a process flowchart showing a phase control process in the wireless power transmission system according to the first embodiment. Here, the number of power transmission panels 4 other than the reference power transmission panel 3 is n, and each power transmission panel has an identification code. The phase adjustment of each power transmission panel 4 is performed by a phase shifter that shifts the phase of the high-frequency reference signal. For example, when a 5-bit phase shifter is used, 32 stages of phase setting are possible, and one stage of such a multistage settable phase shifter is changed to a designated polarity direction (+ or-direction). A control signal is generated by the phase controller 10. This polarity direction is assumed to be stored for each power transmission panel 4 in the phase control unit 10 and is appropriately set and changed in the phase control process. However, in a completely initial state, a preset default polarity direction (for example, It is assumed that + direction is uniformly stored.

  First, in step S1 of FIG. 2, the loop value k corresponding to the power transmission panel 4 is set to 1, and in step S2, the k-th identification code (k) and the polarity direction (k) are read by the phase controller 10. Next, in step S <b> 3, the phase control unit 10 generates a phase control signal describing the identification code (k) and the polarity direction (k), and transmits it from the communication unit 11. In step S4, on the power transmission device 1 side, the communication unit 6 receives the phase control signal to reproduce the identification code (k) and the polarity direction (k), and the control unit 7 transmits the identification code (k) power transmission panel. The phase is changed by one stage in the polarity direction (k) reproduced for 4.

  Next, in step S5, the power received by the rectenna 9 is measured (measured before and after the phase change), and the phase control unit 10 determines whether or not the power transmission efficiency has been improved. If the power transmission efficiency is not improved, the process proceeds to step S6 to reverse the polarity direction (k), and then in step S7, the phase control unit 10 identifies the identification code (k) and the polarity direction (k). Is generated and transmitted from the communication unit 11. Further, in step S8, on the power transmission device 1 side, the communication unit 6 receives the phase control signal, reproduces the identification code (k) and the polarity direction (k), and the control unit 7 sets the identification code (k). The phase is changed by one stage in the polarity direction (k) regenerated for the power transmission panel 4. By these processes, when the power transmission efficiency is not improved, the phase of the power transmission panel 4 of the identification code (k) is restored. Thereafter, the process proceeds to step S9 to advance the loop value k by one.

  In addition, when it is determined in step S5 that the power transmission efficiency is improved, the process proceeds to step S9 and the loop value k is advanced by 1. After step S9, the process proceeds to step S10, and the loop value k is equal to that of the power transmission panel 4. If it exceeds the number n, the loop value k is reset to 1 in step S11. After step S10 and step S11, the phase control of the power transmission panel 4 is sequentially repeated by returning to step S2. Note that the processing flowchart of FIG. 2 loops infinitely, but can be interrupted with appropriate interrupt processing.

  As described above, after adjusting the phase of the power transmission panel 4 by one stage, the phase control is immediately shifted to the next power transmission panel, so that the amount of phase adjustment per phase control of the power transmission panel 4 is small. 4 Phase control of all numbers is completed in a short time. This is effective for correcting a phase shift of a higher frequency of the power transmission panel, and improves the phase correction accuracy. In addition, since the phase operation amount is suppressed to one stage, even if phase adjustment is performed, there is little effect on the transmission beam, and even if phase adjustment is performed simultaneously with power transmission, power transmission efficiency is not significantly impaired. . Moreover, the interference intensity other than the target power receiving equipment can be suppressed at the same time. Furthermore, according to this phase control process, since the phase control direction with a high possibility that a phase will improve from the result of the last phase control is memorize | stored with respect to each power transmission panel 4, a phase is changed at random. Phase adjustment can be performed more reliably than in the case.

  In addition, the plurality of power transmission panels 4 may be set as one group, and the entire power transmission panel 4 may be divided into a plurality of groups, and phase adjustment may be performed by simultaneously changing the phase of the power transmission panel 4 by one stage for each group. it can.

  FIG. 3 is a schematic diagram showing one model of the power transmission panel and its beam pattern. The power transmission panel 4 shown in FIG. 3A is composed of a total of 64 power transmission panels having a square arrangement of 8 panels × 8 panels. FIG. 3B is a schematic diagram showing a beam pattern of the power transmission panel 4, and DATA 0 indicated by a solid line is a beam in a state where the phases of the radiated microwaves from the 64 power transmission panels are completely matched. The pattern is shown. Further, DATA1 indicated by a solid thin line in FIG. 3B indicates a beam pattern in a state where only four power transmission panels in the lower left corner are shifted in phase. In this model, the beam pattern in a state where the phase of an arbitrary power transmission panel is shifted can be obtained.

  Next, a random phase error is given to the power transmission panel model shown in FIG. 3, and phase adjustment according to the present invention is performed. FIG. 4 is a schematic diagram showing transmission phase improvement by random phase error to be applied and phase adjustment. FIG. 4A shows an average value of phase errors (absolute values) in 5 cases in which phase errors are randomly given to 64 panels. In these 5 cases, if each panel is phase-adjusted using a 5-bit phase shifter (32 stages of phase setting), as shown in FIG. 4B, the power transmission intensity may be improved for each number of phase adjustments. Recognize. Here, one of the 64 panels is used as a reference power transmission panel, and phase adjustment is not performed, but phase adjustment is performed on the other 63 power transmission panels according to the phase adjustment flow shown in FIG. The number of phase adjustments shown in FIG. 4B is counted as one when the loop value k makes a round from 1 to 63. According to FIG. 4B, it can be seen that the phase adjustment is almost completed at the 15th phase adjustment. Note that the transmission intensity index used in FIG. 4B is the beam intensity (maximum of the beam intensity when the phase error occurs in the transmission panel with respect to the center maximum value of the beam intensity when the phases of the transmission panel are aligned. Value) is expressed in dB, and when the transmission intensity index becomes 0 dB, it indicates that the phase of the power transmission panel is restored.

  Embodiment 2

  A wireless power transmission system, a rectenna base station, and a power transmission apparatus according to Embodiment 2 of the present invention will be described with reference to FIGS. 5 is a block diagram showing the overall configuration of a wireless power transmission system according to Embodiment 2 of the present invention. In FIG. 5, 12 is a phase control unit provided on the power transmission apparatus 1 side, and 13 is a signal processing unit that performs signal processing on received power information of the rectenna 9 on the rectenna base station 2 side and outputs it to the communication unit 11. . 2, circuits and portions having the same reference numerals as those in FIG. 1 are the same or corresponding circuits and portions as those circuits and portions in FIG.

  A phase control process in the wireless power transmission system according to the second embodiment of the present invention will be described with reference to FIG. FIG. 6 is a process flowchart showing a phase control process in the wireless power transmission system according to the second embodiment.

  First, in step S12 of FIG. 6, the loop value k corresponding to the power transmission panel 4 is set to 1, and in step S13, the phase control unit 12 reads the kth identification code (k) and the polarity direction (k). In step S14, the phase control unit 12 generates a phase control command describing the identification code (k) and the polarity direction (k), and outputs the phase control command to the control unit 7. The control unit 7 generates the identification code (k). The phase of the power transmission panel 4 is changed by one step in the polarity direction (k).

  Next, received power information in the rectenna 9 is received by the communication unit 6 in step S15. Here, it is assumed that the received power information is transmitted from the communication unit 11 of the rectenna base station 2 at regular time intervals. Based on the received power information, the phase control unit 12 determines whether the power receiving efficiency has been improved in step S16. If the power transmission efficiency is not improved, the process proceeds to step S17 to reverse the polarity direction (k), and then in step S18, the phase control unit 12 identifies the identification code (k) and the polarity direction (k). Is output to the control unit 7, and the control unit 7 changes the phase of the power transmission panel 4 with the identification code (k) by one stage in the polarity direction (k). By these processes, when the power transmission efficiency is not improved, the phase of the power transmission panel 4 of the identification code (k) is restored. Thereafter, the process proceeds to step S19 to advance the loop value k by one.

  In addition, when it is determined in step S16 that the power transmission efficiency is improved, the process proceeds to step S19 to advance the loop value k by 1, and after step S19, the process proceeds to step S20. If the number n is exceeded, the loop value k is reset to 1 in step S21. By returning to step S13 after step S20 and step S21, the phase control of the power transmission panel 4 is sequentially repeated. Note that the processing flowchart of FIG. 6 loops infinitely, but can be interrupted with appropriate interrupt processing.

  Since the phase control processing of the wireless power transmission system is described by a simple processing flowchart and does not require complicated calculation, it can be realized by a small signal processing circuit system. In the second embodiment, the phase control unit 12 composed of such a small processing circuit system is arranged on the power transmission device 1 side, and it is sufficient to construct the device within the mounting limit range of the flying object. Is possible. Since the phase control unit 12 is on the power transmission device 1 side, the communication between the rectenna base station 2 side and the power transmission device 1 side may be only the received power information as far as the phase control of the present invention is concerned. The amount can be reduced, and the communication unit 6 and the communication unit 11 can also be configured with simpler devices.

  Embodiment 3

  In the first and second embodiments of the present invention, the reference power transmission panel 3 and the other power transmission panels 4 are described in FIGS. 1 and 5 in such a configuration that they are structurally separated from each other. 7, the reference power transmission panel 3 and other power transmission panels 4 may be configured as a partial region of one power transmission panel structure 14. Even in the power transmission panel structure 14 having the reference power transmission panel 3 and other power transmission panels 4 as regions, the reference power transmission panel 3 and the other power transmission panel 4 portions have a phase shift function. The phase control processing of the wireless power transmission system described in Embodiments 1 and 2 can be performed. In this case, the division pattern of the power transmission panel does not need to be fixed and can be changed by the controller during operation.

  Embodiment 4

  A wireless power transmission system, a rectenna base station, and a power transmission apparatus according to Embodiment 4 of the present invention will be described with reference to FIG. FIG. 8 is a block diagram showing the configuration of the phase control unit provided in the wireless power transmission system according to Embodiment 4 of the present invention. In FIG. 8, reference numeral 15 denotes a phase control unit, which is substituted for the phase control unit 10 and the phase control unit 12 shown in FIGS. 1 and 5 in the first and second embodiments. In the phase control unit 15, 16 generates a control signal (command) for changing the phase of the power transmission panel 4 and outputs it to the communication unit 11 in the case of FIG. 1 and to the control unit 7 in the case of FIG. 9 is a phase control circuit unit that performs phase control based on received power information from 9 so that power transmission efficiency is good. 17 is a phase control sequence control unit that controls the order of the power transmission panels 4 that perform phase control, 18 is a phase control time / control amount control unit that controls the time interval and phase control amount of phase control, and 19 is a phase adjustment time control unit. A transmission power control unit 20 that controls transmission power from the power transmission panel 4, and 20 is a phase control unit control unit that groups the power transmission panels and shortens the time for improving transmission efficiency. The phase control order control unit 17, the phase control time / control amount control unit 18, the transmission power control unit 19, and the phase control unit control unit 20 perform control for improving the accuracy and convergence of the phase control. These functions can be individually turned ON / OFF.

  The phase control sequence control unit 17 stores the amount of change in power transmission efficiency with respect to the phase control amount of each power transmission panel 4 in the phase control of the power transmission panel 4 until the previous time, and in the next phase control, the power efficiency up to the previous time is stored. The order of the identification code (k) is changed so that phase control can be performed from the power transmission panel 4 having a high improvement effect. In addition, the power transmission panel 4 in which the change in the amount of power before and after the phase change is equal to or less than the set threshold and cannot be expected to improve the power efficiency, or the power transmission panel 4 in which the power transmission efficiency is not improved even if the phase is controlled in either positive or negative direction. , The phase control circuit unit 16 is instructed not to perform the phase control for the set number of times. In this way, by controlling the phase control sequence of the power transmission panel 4, faster power transmission efficiency can be improved.

  The phase control time / control amount control unit 18 stores the measurement noise component at the measurement frequency at the time of power efficiency measurement on the power receiving side in the phase control of the power transmission panel 4 until the previous time. In the next phase control, the amount of power change is adjusted so that the amount of phase change relative to the phase control amount of each panel is greater than the noise component, and the amount of change in power efficiency can be determined, and the measured values are averaged. This reduces the noise component. In addition, when the amount of change in power efficiency with respect to the previous phase change is stored, and it takes a long time longer than the specified threshold to reduce the noise component of the power efficiency measurement value, the phase control amount is increased by the specified amount. To enlarge. Alternatively, if the time is shorter than the specified threshold, the specified amount phase control amount is reduced. Even if the power efficiency is measured for a specified time or more and the change amount of the power efficiency is less than the noise component and improvement cannot be determined, it is determined that there is no power change with respect to the phase control. Note that a value obtained in advance may be used for the measurement noise component on the power receiving side. The specified amount used for control determines the optimum value in the power transmission system. When the power transmission efficiency is lower than the specified value, the phase control amount is increased to shorten the time for improving the power transmission efficiency.

  The transmission power control unit 19 performs the power transmission output 100 in a situation where the phase adjustment of each power transmission panel 4 is not yet performed at the start of power transmission device operation or maintenance, and the phase of each power transmission panel 4 is almost not aligned. When it is difficult to adjust the phase by% (because a problem such as electric power interferes with a point other than the target power receiving apparatus), other than the reference power transmission panel 3 and the power transmission panel 4 being phase-adjusted, or the reference power transmission panel 3 The phase of the power transmission panel 4 can be initially adjusted by reducing or turning off power transmission other than the power transmission panel 4 whose phase has been adjusted and the power transmission panel 4 whose phase is being adjusted. In addition, in order to further suppress the amount of interference outside the power receiving rectenna, it is also possible to reduce the power amount of all panels including the reference power transmission panel 3 and the power transmission panel 4 that outputs power during phase adjustment. . Further, the transmission power control unit 19 may adjust the power of surrounding panels in order to reveal the influence on the power of the power transmission panel 4 during phase adjustment.

  The phase control unit control unit 20 controls a phase control unit related to the number of phase control by phase-controlling a plurality of power transmission panels 4 as a group as a set of power transmission panels. By widening the phase control unit, an increase in the number of phase control operations is suppressed, and phase adjustment can be performed in a shorter time. Control units can be grouped by grouping multiple power transmission panels in sections with little phase fluctuation, such as close to the reference panel based on previous phase control results or a proactive survey, and multiple power transmission panels with common phase changes. Can be spread. Further, when the power transmission efficiency is lower than the specified value, the power transmission efficiency can be improved in a short time by grouping the power transmission panels and suppressing the number of phase control. Conversely, when the power transmission efficiency is good, the grouping of the power transmission panels is reduced, and the power transmission efficiency is further improved by performing more detailed phase control in each power transmission panel.

DESCRIPTION OF SYMBOLS 1 Electric power transmission apparatus 2 Rectenna base station 3 Reference | standard power transmission panel 4 Power transmission panel 9 Rectenna 10, 12, 15 Phase control part

Claims (14)

In a wireless power transmission system in which a microwave is transmitted from a power transmission device to a rectenna base station and received by the rectenna base station to generate power, the power transmission device is a reference power transmission that serves as a reference for the phase of the microwave to be transmitted. And a plurality of power transmission panels other than the reference transmission panel, wherein the rectenna base station receives and rectifies microwaves transmitted from the reference power transmission panel and the plurality of power transmission panels to generate power. And a phase control unit that generates a phase control signal for changing the phases of the plurality of power transmission panels, wherein the phase control unit is configured to transmit a transmission microwave for one power transmission panel of the plurality of power transmission panels. the phase is changed one stage, the plurality of power transmitting panels comprising the reference power panel and transmission panel was changed one stage phase of the transmitted microwave The phase of the transmission panel is changed one stage the phase of the transmitted microwave and remains fully if the power transmission efficiency et transmitted microwaves is improved, the reference transmission panel and the transmission phases of microwaves If the transmission efficiency of the microwaves transmitted from the plurality of power transmission panels including the power transmission panel that has been changed by one stage is not improved, phase adjustment is performed to return to the phase before the change, and then the phase adjustment is performed for the plurality of phases. A wireless power transmission system, wherein the phase adjustment is sequentially performed on the plurality of power transmission panels by performing the processing on two of the power transmission panels . In the rectenna base station that generates power by receiving and rectifying microwaves transmitted from the power transmission device, it generates power by receiving and rectifying the microwaves transmitted from the reference power transmission panel and the plurality of power transmission panels of the power transmission device. And a phase control unit that generates a phase control signal for changing the phase of the plurality of power transmission panels. The phase control unit transmits a transmission micro of one power transmission panel of the plurality of power transmission panels. The phase of the wave is changed by one stage, and the power transmission efficiency of the microwaves transmitted from the plurality of power transmission panels including the reference power transmission panel and the power transmission panel in which the phase of the transmission microwave is changed by one stage is improved. the phase of the transmission panel was changed one stage phase of the transmitted microwave and remains fully in the case, the reference power panel and the transmission phases of microwaves When the power transmission efficiency of the microwave transmitted from the plurality of power transmission panel comprising a power panel is changed one stage does not improve performs phase adjustment to return to its pre-change phase, then the phase adjustment of the plurality A rectenna base station characterized in that the phase adjustment is sequentially performed on the plurality of power transmission panels by performing the processing on two of the power transmission panels .   The rectenna base station according to claim 2, wherein the phase control unit obtains power generation information in the power transmission device and calculates power transmission efficiency.   The rectenna base station according to claim 2, wherein the phase control unit stores a change amount of the power transmission efficiency due to the phase adjustment, and performs the next phase adjustment in the order of the power transmission panels having a high effect of improving the power transmission efficiency.   The rectenna base station according to claim 2, wherein the phase control unit increases a next phase adjustment amount based on an improvement amount of power transmission efficiency by phase adjustment.   The rectenna base station according to claim 2, wherein the phase control unit performs control to change transmission power of microwaves output from the reference power transmission panel and the plurality of power transmission panels.   The rectenna base station according to claim 2, wherein the phase control unit performs phase adjustment by grouping two or more power transmission panels among the plurality of power transmission panels. In a wireless power transmission system in which a microwave is transmitted from a power transmission device to a rectenna base station and received by the rectenna base station to generate power, the power transmission device is a reference power transmission that serves as a reference for the phase of the microwave to be transmitted. A panel, a plurality of power transmission panels other than the reference transmission panel, and a phase control unit that changes the phase of the plurality of power transmission panels, and the rectenna base station includes the reference power transmission panel and the plurality of power transmission panels. A rectenna that generates power by receiving and rectifying the transmitted microwave is provided, and the phase control unit changes the phase of the transmission microwave by one stage for one of the plurality of power transmission panels. , microwaves transmitted from the plurality of power transmission panel comprising a power panel was changed one stage phase of the reference power transmitting panel and the transmission microwave When the power transmission efficiency is improved and remains fully the phase of the transmitted microwave power panel was changed one stage phase was the reference transmission panel and the transmission phases of microwaves is changed one stage When the power transmission efficiency of the microwaves transmitted from the plurality of power transmission panels including the power transmission panel is not improved, the phase adjustment is performed to return to the phase before the change, and then the phase adjustment is performed on two of the plurality of power transmission panels. A wireless power transmission system, wherein the phase adjustment is sequentially performed on the plurality of power transmission panels by performing the power transmission panel . In a power transmission device that transmits microwaves to generate power by receiving and rectifying with a rectenna of a rectenna base station, a reference power transmission panel serving as a reference for the phase of the microwave to be transmitted, and a plurality of power transmissions other than the reference transmission panel A phase control unit that changes the phase of the plurality of power transmission panels, and the phase control unit is configured to set the phase of the transmission microwave to one stage for one power transmission panel of the plurality of power transmission panels. When transmission efficiency of the microwaves transmitted from the plurality of power transmission panels including the power transmission panel that is changed and the phase of the reference power transmission panel and the transmission microwave is changed by one stage is improved, the transmission microwave transmitting panels phase power transmission panel is changed one stage phase and remains fully and the reference power panel and the transmission phases of microwaves is changed one stage of Above for the power transmission efficiency of the plurality of microwaves transmitted from the power transmission panel has not improved performs phase adjustment to return to its pre-change phase, then second power transmission panels of the plurality of power transmitting panels the phase adjustment comprising By performing the above, the phase adjustment is sequentially performed on the plurality of power transmission panels.   The power transmission device according to claim 9, wherein the phase control unit calculates transmission efficiency based on generated power information.   The said phase control part memorize | stores the variation | change_quantity of the power transmission efficiency by phase adjustment, and performs the next phase adjustment in order of the power transmission panel with a high effect of a power transmission efficiency improvement, The power transmission device of Claim 9 characterized by the above-mentioned.   The power transmission device according to claim 9, wherein the phase control unit increases a next phase adjustment amount based on an improvement amount of power transmission efficiency by phase adjustment.   The power transmission device according to claim 9, wherein the phase control unit performs control to change microwave transmission power output from the reference power transmission panel and the plurality of power transmission panels.   The power transmission device according to claim 9, wherein the phase control unit performs phase adjustment by grouping two or more power transmission panels among the plurality of power transmission panels.

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