Power density distribution testing device of remote microwave wireless energy transmission system

Abstract

The invention provides a power density distribution testing device of a remote microwave wireless energy transmission system, which comprises a motion structure, a controller and a testing unit, wherein the moving structure comprises a rotary table, a rotating structure arranged below the rotary table, four radial moving structures fixed on the rotary table and a moving structure consisting of a wave-absorbing material laid on the upper surface of the rotary table; the number of the testing units is at least five, and the testing units are fixed to the center of the rotary table and the four sliding blocks respectively. The rotating structure and the four radial motion structures are controlled by the controller to drive the test units on the four sliding blocks to move along the guide rails, and the rotary table rotates around the central axis of the rotary table. By coordinating rotation and linear movement, comprehensive measurement of microwave energy beams is realized, a complete power density distribution diagram is finally generated, and the defects that in the prior art, the position error of an RFID tag grid is large due to limited unmanned aerial vehicle precision control and the precision error of a flexible net structure is caused due to the influence of self weight are overcome.

Description

Technical Field

[0001] The present invention belongs to the technical field of power electronics and radio frequency technology of energy transmission, and relates to a power density distribution test device, and specifically to a microwave wireless power density distribution test device in a long-range microwave wireless energy transmission system. Background Art

[0002] With the advancement of science and technology and people's pursuit of convenient life, long-distance microwave wireless energy transmission technology has gradually emerged and become an important research direction of modern power transmission. The long-distance microwave wireless energy transmission system built based on this technology includes a transmitting antenna subsystem and a rectifying antenna subsystem. The transmitting antenna subsystem converts the external DC energy into radio frequency energy through the power amplifier and crystal oscillator circuit, and radiates it into free space through the transmitting antenna; the rectifying antenna receives the radio frequency energy and rectifies it into DC energy using a diode. This system overcomes the limitations of traditional wired transmission and is widely used in electric vehicle charging, consumer electronic equipment, medical equipment and other fields.

[0003] However, with the continuous development of microwave wireless energy transmission technology, the performance evaluation of microwave wireless energy transmission systems has become increasingly important. Among them, power density is particularly important as a key indicator for measuring the efficiency of wireless energy transmission systems. Power density refers to the energy transmitted per unit volume or unit area, usually expressed in watts per cubic meter (W / m 3 or Watt per square meter W / m 2 Indicates. Early microwave wireless energy transmission experiments all ignored the measurement of the power density of the microwave wireless energy transmission system, resulting in poor matching between the transmitting antenna and the receiving rectenna, that is, the input power corresponding to the maximum efficiency of the rectenna is mismatched with the microwave power density irradiated from the transmitting antenna to the receiving antenna. Therefore, accurate measurement of the power density distribution from the transmitting antenna to the receiving antenna in the microwave wireless energy transmission system is a necessary condition to ensure system performance. However, the existing power density distribution test technology has many challenges and shortcomings.

[0004] The existing power density distribution test device of the long-distance microwave wireless energy transmission system uses an RFID tag grid carried by a drone to achieve efficient and flexible measurement of power density distribution. However, the mesh structure of the RFID tag grid is subject to the limitations of the material's deadweight and the precision control of the drone, resulting in a certain position error, which affects the measurement accuracy and makes it difficult to accurately evaluate the microwave energy beam. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and propose a power density distribution test device for a microwave antenna in a long-distance microwave wireless energy transmission system, which is used to solve the technical problem of low test accuracy in the prior art.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention includes a motion structure, a controller and a test unit that moves linearly downward; the motion structure includes a rotating structure arranged below the turntable and four radial motion structures fixed on the upper surface of the turntable, which are distributed in a cross shape and do not contact each other; the upper surface of the turntable is paved with an absorbing material; the rotating structure includes a high-voltage motor; the radial motion structure includes a servo motor and a lead screw connected to its output shaft, a slider matched with the lead screw and a guide rail for the movement of the slider; there are at least 5 test units, which are respectively fixed at the center position of the turntable and on the four sliders; the rotating structure and the four radial motion structures are controlled by the controller to drive the test units on the four sliders to move along the guide rails, and the turntable rotates around its central axis.

[0007] As an optimization, the turntable adopts a circular plate structure and is fixed on the turntable base through a turntable support frame.

[0008] As an optimization, the rotating structure also includes two vertically meshing bevel gears, one of which is fixed on the turntable support and the other is fixed to the output shaft of the high-voltage motor.

[0009] As an optimization, the high voltage motor is fixed on the turntable base.

[0010] As an optimization, the turntable support frame has an upper end fixed to the turntable and a lower end that rotates relative to the turntable base.

[0011] As an optimization, the four radial motion structures fixed on the upper surface of the turntable are distributed in an orthogonal shape.

[0012] As an optimization, the radial motion structure further includes a support frame, and the slider is fixed at the bottom end of the support frame.

[0013] As an optimization, the test unit includes a test antenna and a power probe connected through an attenuator, and the test antenna is fixed on the top of the support frame.

[0014] As an optimization, the test antenna includes a dielectric substrate and a radiator consisting of four rectangular metal patches printed on the upper surface thereof.

[0015] As an optimization, the attenuator is connected to the radio frequency SMA ports fixed on the lower surface of the dielectric substrate and the upper end of the power probe respectively.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] (1) The rotating structure of the present invention drives a pair of vertically meshed bevel gears through a motor to control the turntable to rotate around its central axis, and the four radial motion mechanisms drive the lead screws through radial motors to rotate so that the test units on the four sliders move along the guide rails, thereby achieving high-precision scanning of the test units in radial and circumferential directions. This avoids the defect of the prior art RFID tag grid, which has a large position error due to the limited precision control of the drone.

[0018] (2) The present invention adopts a rigid structure and implements a lightweight design on this basis, so that the entire device has less influence on its own weight. This design ensures the accuracy of the test unit in the vertical direction, avoids the problem of being greatly affected by the own weight due to the use of a flexible mesh structure in the prior art, and thus significantly reduces the accuracy error caused by structural deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is an overall schematic diagram of an embodiment of the present invention;

[0020] Figure 2 for Figure 1 A top view of

[0021] Figure 3 A diagram showing the positional relationship between the high voltage motor, the support frame and the turntable base of the present invention;

[0022] Figure 4 A diagram showing the position relationship between the test unit and the support frame of the present invention;

[0023] Figure 5 It is a schematic diagram of the radial motion structure of the present invention. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] Reference Figure 1 and Figure 2 The present invention includes a motion structure and a test unit that moves linearly under the control of the motion structure under the control of a controller; the motion structure includes a rotating structure 2 arranged below the turntable 1 and four radial motion structures 3 fixed on the upper surface of the turntable 1 and distributed in a cross shape and not in contact with each other; there are at least five test units 4, which are respectively fixed at the center position of the turntable 1 and four sliders 33. The number of test units in this embodiment is 9, one of which is arranged at the center position of the upper surface of the turntable, and two are arranged on each guide rail; the rotating structure 2 and the four radial motion structures 3 are controlled by the controller to drive the test units 4 on the four sliders 33 to move along the guide rail 34, and the turntable 1 rotates around its central axis. The turntable 1 adopts a circular plate structure and is fixed to the turntable base 6 through a turntable support frame 7.

[0026] The four radial motion structures 3 fixed on the upper surface of the turntable 1 are orthogonally distributed to ensure that evenly distributed test units can be accurately tested simultaneously; the upper surface of the turntable 1 is paved with absorbing material 5 to effectively reduce the interference of external environmental noise on the test results during the test process;

[0027] The rotating structure 2 has a structure as follows: Figure 3 As shown, it includes a high-voltage motor 21; the high-voltage motor 21 is fixed on the turntable base 6; the rotating structure 2 also includes two vertically meshing bevel gears, one of which is fixed on the turntable support frame 7, and the other is fixed to the output shaft of the high-voltage motor 21, to ensure the stability and accuracy of the rotating structure; the turntable support frame 7, its upper end is fixed to the turntable 1, and the lower end rotates relative to the turntable base 6.

[0028] The test unit 4 has a structure as follows Figure 4 As shown, the test unit 4 includes a test antenna 41 and a power probe 43 connected by an attenuator 42, and the test antenna 41 is fixed to the top of the support frame 35. The test antenna 41 includes a dielectric substrate 411 and a radiator 412 composed of four rectangular metal patches printed on its upper surface. The attenuator 42 is connected to the RF SMA port fixed on the lower surface of the dielectric substrate 411 and the upper end of the power probe 43, respectively.

[0029] The radial motion structure 3 has a structure as follows: Figure 5 As shown, it includes a servo motor 31 and a screw 32 connected to its output shaft, a slider 33 cooperating with the screw 32, and a guide rail 34 for the slider to move; the radial motion structure 3 also includes a support frame 35, and the slider 33 is fixed at the bottom end of the support frame 35 to ensure that the slider moves smoothly on the guide rail, reducing positioning errors caused by factors such as friction.

[0030] The working principle of the present invention is that after the rotating mechanism receives the instruction through the controller, the high-voltage motor drives a pair of vertically meshed bevel gears to ensure that the turntable can rotate smoothly and accurately around its central axis. This design significantly improves the stability of the rotation, so that the test unit can achieve high-precision positioning and scanning in the circumferential direction. At the same time, the servo motor in the radial motion mechanism drives the lead screw to rotate through the output shaft under the instruction of the controller, driving the slider to move linearly on the guide rail. This precise mechanical transmission system ensures that the test unit can achieve high-precision positioning in the radial direction. The support frame of each radial motion mechanism connects the test antenna and the slider, further ensuring the stability and accuracy during the movement. Through the coordination of the rotating mechanism and the radial motion mechanism, the test unit can achieve a high degree of synchronization and accuracy during the entire operation. Specifically, the test unit receives the radio frequency energy and conducts it to the power probe through the attenuator to obtain the power density data of the current position. Then, through the precise control of the radial and circumferential motion mechanisms, the test unit moves to the next test point to obtain the power density data of the point. This process is repeated until the entire test plane is covered, and finally a complete power density distribution diagram is generated, ensuring the comprehensiveness and accuracy of the measurement. The overall system achieves accurate scanning and analysis of complex electromagnetic environments by coordinating rotation and radial motion, providing an efficient and reliable solution for the microwave testing field.

Claims

1. A power density distribution test device for a long-range microwave wireless energy transmission system, characterized in that: The invention comprises a motion structure, a controller and a linearly movable test unit; the motion structure comprises a rotating structure (2) arranged below a turntable (1) and four radial motion structures (3) fixed on the upper surface of the turntable (1) and distributed in a cross shape and not in contact with each other; the upper surface of the turntable (1) is paved with an absorbing material (5); the rotating structure (2) comprises a high-voltage motor (21); the radial motion structure (3) comprises a servo motor (31) and a lead screw (32) connected to its output shaft, a slider (33) matched with the lead screw (32) and a guide rail (34) for the slider to move; there are at least five test units (4), which are respectively fixed at the center position of the turntable (1) and on the four sliders (33); the rotating structure (2) and the four radial motion structures (3) are controlled by the controller to drive the test units (4) on the four sliders (33) to move along the guide rail (34), and the turntable (1) rotates around its central axis.

2. The testing device according to claim 1, characterized in that: The turntable (1) adopts a circular plate structure and is fixed on the turntable base (6) via a turntable support frame (7).

3. The testing device according to claim 2, characterized in that: The rotating structure (2) also includes two vertically meshing bevel gears, one of which is fixed on the turntable support frame (7) and the other is fixed to the output shaft of the high-voltage motor (21).

4. The testing device according to claim 2, characterized in that: The high-voltage motor (21) is fixed on the turntable base (6).

5. The testing device according to claim 1, characterized in that: The turntable support frame (7) has an upper end fixed to the turntable (1) and a lower end that rotates relative to the turntable base (6).

6. The testing device according to claim 1, characterized in that: The turntable (1) has four radial motion structures (3) fixed on its upper surface which are distributed in an orthogonal shape.

7. The testing device according to claim 1, characterized in that: The radial motion structure (3) further comprises a support frame (35), and the sliding block (33) is fixed at the bottom end of the support frame (35).

8. The testing device according to claim 6, characterized in that: The test unit (4) comprises a test antenna (41) and a power probe (43) connected via an attenuator (42); the test antenna (41) is fixed on the top of a support frame (35).

9. The testing device according to claim 7, characterized in that: The test antenna (41) comprises a dielectric substrate (411) and a radiator (412) composed of four rectangular metal patches printed on the upper surface thereof.

10. The testing device according to claim 8, characterized in that: The attenuator (42) is respectively connected to the radio frequency SMA ports fixed on the lower surface of the dielectric substrate (411) and the upper end of the power probe (43).

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