Control device for microwave anechoic chamber test system

Abstract

The utility model relates to a control device for a microwave anechoic chamber test system. Comprising a shielding box which is a sealed cavity provided with a cover plate, and the shielding box is provided with a power supply socket, a data socket and an optical fiber coupler; a control circuit board, an AC-DC power supply module, a data optical fiber transceiver and other modules are installed in the shielding box. A plurality of motor control units, a power supply interface and a communication interface are integrated on the control circuit board, and a first output end of the AC-DC power supply module is connected with the control board and is used for supplying power to the control board; one end of the data optical fiber transceiver is electrically connected with the optical fiber coupler, and the other end is electrically connected with the communication interface for converting the signal into an optical signal and outputting the optical signal. The control circuit board is placed in the shielding box, so that the size of the rotary table or antenna tower equipment is reduced, and the electromagnetic interference risk of a motor and a darkroom environment is reduced; the control circuit board integrates the servo motor control unit and the stepping motor control unit for modular design, serves as an independent unit of the darkroom test system, and is high in universality.

Description

Technical Field

[0001] This utility model relates to the field of control technology for microwave anechoic chamber testing systems, and specifically to a control device for microwave anechoic chamber testing systems. Background Technology

[0002] Microwave anechoic chambers, as crucial testing sites for antenna products and electromagnetic compatibility (EMC) of electronic products, typically include auxiliary equipment such as turntables and antenna test towers. To ensure high automation and precision, these systems rely on stepper motors or servo motors as their primary power units. Currently, however, the entire servo drive system (including motors, drivers, and control modules) is generally integrated into the main unit. This approach results in excessively large turntables or antenna towers, making electromagnetic shielding design and implementation difficult, especially since the motor is a critical component affecting the overall electromagnetic environment. Furthermore, different drive units need to be developed for different turntable or antenna tower models, leading to a lack of versatility and compatibility across the product series.

[0003] Therefore, it is necessary to improve one or more of the problems existing in the above-mentioned related technical solutions.

[0004] It should be noted that this section is intended to provide background or context for the technical solutions of this utility model as set forth in the claims. The description herein does not constitute an admission that it is prior art simply because it is included in this section. Utility Model Content

[0005] The purpose of this utility model embodiment is to provide a control device for a microwave anechoic chamber testing system, thereby overcoming at least to some extent one or more problems caused by the limitations and defects of related technologies.

[0006] This utility model embodiment provides a control device for a microwave anechoic chamber testing system, including:

[0007] A shielded box, wherein the shielded box is a sealed cavity with a cover plate, and one side of the shielded box is provided with a power socket, a data socket and an optical fiber coupler;

[0008] A control circuit board is installed inside the shielded box. The control circuit board integrates a servo motor control unit, a stepper motor control unit, a power supply interface, and a communication interface.

[0009] The input end of the data socket is electrically connected to the interface of the servo motor control unit or to the interface of the stepper motor control unit.

[0010] An AC-DC power module is installed inside the shielded box. The input terminal of the AC-DC power module is electrically connected to the output terminal of the power socket, and the first output terminal of the AC-DC power module is connected to the power supply interface.

[0011] A data fiber optic transceiver, one end of which is electrically connected to the fiber optic coupler and the other end of which is electrically connected to the communication interface.

[0012] In one embodiment of this utility model, a conductive sponge strip is provided in the gap between the cover plate and the box body.

[0013] In one embodiment of this utility model, the shielding box is formed by bending sheet metal parts made of stainless steel or other metal materials, and all splicing gaps are continuously and fully welded, and an L-shaped mounting plate is welded to the outside of the shielding box.

[0014] In one embodiment of this utility model, the control circuit board also integrates one or more of a solenoid valve control unit, a stroke control unit, and a DC motor control unit. The control interface of the stroke control unit is connected to a DC power filter and a DB9 filter connector in sequence via cables, and then connected to the limit switch of the turntable or antenna tower via an external shielded cable.

[0015] In one embodiment of this utility model, the input end of the power socket is connected to the mains power, and the output end of the power socket is connected to the input end of the AC-DC power module in sequence through a fuse and an AC power filter.

[0016] In one embodiment of this utility model, the shielding box is provided with a movable partition to divide the cavity into two layers. The AC-DC power module, the AC power filter and the DC power filter are installed at the bottom of the box, and the control circuit board and the data fiber optic transceiver are installed on the movable partition.

[0017] In one embodiment of this utility model, a small metal shielding box is provided inside the shielding box for the location of the power supply socket, and a pair of feedthrough filters are installed on the small metal shielding box.

[0018] In one embodiment of this utility model, the data socket is connected to the motor drive module of the turntable or antenna tower via a shielded cable, and the fiber optic coupler is connected to the host computer terminal via an optical fiber.

[0019] In one embodiment of this utility model, a fan is installed on the side of the shielding box, and a shielding ventilation window is installed at the air inlet and air outlet of the fan.

[0020] In one embodiment of this utility model, the second output terminal of the AC-DC power module is electrically connected to the data fiber optic transceiver, the first output terminal outputs DC5V to power the control circuit board, and the second output terminal outputs DC12V to power the data fiber optic transceiver.

[0021] The technical solution provided by one embodiment of this utility model may include the following beneficial effects:

[0022] This utility model provides a control device for a microwave anechoic chamber testing system. On the one hand, by placing the control circuit board in a shielded box, the volume of the turntable or antenna tower equipment is reduced, thereby reducing the risk of electromagnetic interference between the motor and the anechoic chamber environment. On the other hand, by integrating a servo motor control unit and a stepper motor control unit into the control circuit board for modular design, it can serve as an independent unit of the anechoic chamber testing system, with strong versatility. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments conforming to the present invention and, together with the description, serve to explain the principles of the present invention. It is obvious that the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0024] Figure 1 This diagram shows the upper interior layer of the shielding box in an exemplary embodiment of the present invention.

[0025] Figure 2 This diagram shows the bottom layer of the shielding box in an exemplary embodiment of the present invention.

[0026] Figure 3 This diagram shows an external view of the shielding box in an exemplary embodiment of the present invention.

[0027] Figure 4 This diagram shows a partial view of the position of the power socket inside the shielding box in an exemplary embodiment of the present invention.

[0028] Figure 5 This diagram shows the wiring schematic of the control device for a microwave anechoic chamber testing system in an exemplary embodiment of the present invention.

[0029] Reference numerals: 100, Shielding box; 101, Cover plate; 102, Conductive sponge strip; 103, Movable partition; 104, Shielding box; 105, Feedthrough filter; 200, Control circuit board; 201, Data socket; 300, Data fiber optic transceiver; 301, Fiber optic coupler; 302, DB9 filter connector; 400, AC-DC power module; 401, AC power filter; 402, DC power filter; 403, Power socket; 404, Fuse; 301, Fiber optic coupler; 302, DB9 filter connector; 500, Fan; 501, Shielding ventilation window. Detailed Implementation

[0030] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0031] Furthermore, the accompanying drawings are merely illustrative diagrams of embodiments of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0032] This example embodiment provides a control device for a microwave anechoic chamber testing system, referencing... Figure 1 As shown, the control device for the microwave anechoic chamber testing system may include: a shielded box 100, a control circuit board 200, a data fiber optic transceiver 300, and an AC-DC power module 400.

[0033] The shielding box 100 is a sealed cavity with a cover plate 101. One side of the shielding box 100 is provided with a power socket 403, a data socket 201 and an optical fiber coupler 301.

[0034] The control circuit board 200 is installed inside the shielding box 100. The control circuit board 200 integrates a servo motor control unit, a stepper motor control unit, a power supply interface, and a communication interface.

[0035] The input terminal of the data socket 201 is electrically connected to the interface of the servo motor control unit or to the interface of the stepper motor control unit.

[0036] The AC-DC power module 400 is installed inside the shielding box 100. The input terminal of the AC-DC power module 400 is electrically connected to the output terminal of the power socket 403, and the first output terminal of the AC-DC power module 400 is connected to the power supply interface.

[0037] One end of the data fiber optic transceiver 300 is electrically connected to the fiber optic coupler 301, and the other end is electrically connected to the communication interface.

[0038] The control device for a microwave anechoic chamber testing system described above reduces the size of the turntable or antenna tower by placing the control circuit board 200 in the shielded box 100, thereby reducing the risk of electromagnetic interference between the motor and the anechoic chamber environment. On the other hand, the control circuit board 200 integrates a servo motor control unit and a stepper motor control unit for modular design, making it an independent unit of the anechoic chamber testing system with strong versatility.

[0039] The following will refer to Figures 1 to 5 The various parts of the control device for the microwave anechoic chamber test system described above in this example embodiment will be described in more detail.

[0040] The control circuit board 200 integrates multiple key control units and interfaces, enabling crucial control of different motors and communication with external devices. The shielded enclosure 100 provides an electromagnetic shielding environment for internal components, ensuring stable operation of the device in the complex electromagnetic environment of a microwave anechoic chamber. The data fiber optic transceiver 300 converts optical signals to electrical signals, enabling reliable communication between the control device and the host computer terminal. The AC-DC power module 400 converts AC power to DC power, supplying power to the control circuit board 200 and the data fiber optic transceiver 300. The power socket 403 is used for connecting to mains power, while the data socket 201 and fiber optic coupler 301 are used for transmitting control signals and data signals, respectively. These are mounted on the shielded enclosure 100 for easy connection to external devices.

[0041] In one embodiment, a conductive sponge strip 102 is provided in the gap between the cover plate 101 and the shielding box 100. It should be understood that the cover plate 101 and the shielding box 100 form a complete shielding structure to prevent electromagnetic leakage. Filling the gap between the cover plate 101 and the box with the conductive sponge strip 102 further enhances the shielding effect. The conductive sponge strip 102 has good conductivity and elasticity; after filling the gap, it allows the cover plate 101 to fit tightly against the shielding box 100, reducing electromagnetic leakage paths and ensuring that the electromagnetic environment inside the shielding box 100 is not disturbed by external interference, while also preventing electromagnetic signals inside the box from affecting the outside world.

[0042] In one embodiment, the shielding box 100 is formed by bending sheet metal parts of stainless steel or other metals, with all joints fully welded continuously. An L-shaped mounting plate is welded to the outside of the shielding box 100. It should be understood that the material and manufacturing process of the shielding box 100 affect its electromagnetic shielding performance. Using stainless steel or other metals inherently provides excellent electromagnetic shielding characteristics. Fully welded joints ensure that the box forms a complete shielding space, minimizing electromagnetic leakage and effectively isolating the box from external electromagnetic interference. The L-shaped mounting plate welded to the outside of the shielding box 100 facilitates the installation of the control device on the ground, wall, or other equipment, enhancing the flexibility and stability of the device installation and meeting the needs of different test sites and equipment layouts.

[0043] In one embodiment, the control circuit board 200 also integrates one or more of a solenoid valve control unit, a stroke control unit, and a DC motor control unit. The control interface of the stroke control unit is connected sequentially to the DC power filter 402 and the DB9 filter connector 302 via cables, and then connected to the limit switch of the turntable or antenna tower via an external shielded cable. It should be understood that this expands the functionality of the control circuit board 200. The solenoid valve control interface can be used to control solenoid valves related to the test system, controlling valves used to switch the test environment or adjust the state of the test equipment. The DC motor control unit enables the control device to control multiple motors. This improves the compatibility of the test system, allowing it to adapt to equipment driven by different types of motors. Whether it's the integration of new equipment or the upgrading of old equipment, it can easily work in conjunction with the control device, enhancing the versatility and flexibility of the test system and reducing system upgrade and maintenance costs. The travel limit switch control interface is used to connect to the travel limit switches of the turntable or antenna tower. When the equipment reaches the set position, the limit switch activates, and a signal is fed back to the control circuit board through this interface, controlling the motor to stop running and preventing the equipment from exceeding the safe operating range. This protects the equipment and personnel, while ensuring the accuracy and reliability of the testing process. The DC power filter 402 and DB9 filter connector 302 further enhance the functionality of the control device. Both the DC power filter 402 and DB9 filter connector 302 are used to filter out noise in the DC power supply, preventing power noise from interfering with the limit switch signal transmission. The DB9 filter connector 302 also acts as a converter, connecting to the limit switch of the turntable or antenna tower via an external shielded cable, enhancing the stability and anti-interference capability of signal transmission, ensuring that the limit switch signal is accurately fed back to the control circuit board 200, and achieving precise control and safety protection of the equipment's operating position.

[0044] In one embodiment, the input terminal of the power socket 403 is connected to the mains power, and the output terminal of the power socket 403 is connected to the AC-DC power module 400 via a fuse 404 and an AC power filter 401. It should be understood that the power socket 403 is directly connected to the mains power in the dark room, providing power to the device. The fuse 404 can quickly cut off the circuit when the external power supply voltage is abnormal, protecting the modules and devices within the device from damage due to excessive voltage. The AC power filter 401 further filters out noise in the power line, improving the purity of the power supply.

[0045] In one embodiment, the shielded enclosure 100 is provided with a movable partition 103, dividing the cavity into two layers. The AC-DC power module 400, the AC power filter 401, and the DC power filter 402 are installed at the bottom of the enclosure, while the control circuit board 200 and the data fiber optic transceiver 300 are installed on the movable partition 103. It should be understood that the movable partition 103 divides the shielded enclosure 100 into two layers, and this layered layout design optimizes the utilization of internal space. The AC-DC power module 400, AC power filter 401, and DC power filter 402 are installed at the bottom of the enclosure, close to the power socket 403, reducing the length of the power supply line and lowering line loss and electromagnetic interference risks. The control circuit board 200 and the data fiber optic transceiver 300 are installed on the movable partition 103, facilitating wiring and signal transmission, while also being appropriately separated from the power module to reduce the impact of electromagnetic interference generated by the power module on control and communication functions, thereby improving the overall performance of the device.

[0046] In one embodiment, a small metal shielding box 104 is provided inside the shielding box 100 at the location of the power socket 403, and a pair of feedthrough filters 105 are installed on the small metal shielding box 104. It should be understood that providing the small metal shielding box 104 and feedthrough filters 105 at the location of the power socket 403 further isolates external electromagnetic interference, providing double protection for the stability and reliability of the power supply, ensuring the device operates normally in complex electromagnetic environments. It should also be understood that the cable between the feedthrough filter 105 and the AC power filter 401 is wound around a magnetic ring four times, and all power cables are twisted in pairs. When alternating current flows through the cable, it generates an outward-radiating electromagnetic field. The magnetic ring can confine these magnetic fields inside the ring, reducing outward-radiating electromagnetic interference and preventing interference with other sensitive equipment in the microwave anechoic chamber. Simultaneously, it also prevents external electromagnetic interference from entering the control device through the cable and affecting the normal operation of the electronic components within the device. The multiple windings of the magnetic ring are equivalent to increasing the number of turns of the ring, which enhances the ring's ability to suppress electromagnetic interference. With each rotation, the magnetic ring's attenuation effect on electromagnetic interference within a specific frequency range is improved. During operation, rotating it four times can more effectively filter out high-frequency and low-frequency noise in the cable, making the current entering the AC power filter 401 purer, further improving the stability of the power supply, and providing a better power supply for the control device.

[0047] In one embodiment, the data socket 201 is connected to the motor drive module of the turntable or antenna tower via a shielded cable, and the fiber optic coupler 301 is connected to the host computer terminal via an optical fiber. It is important to understand that the data socket 201 and the fiber optic coupler 301 are crucial interfaces for data interaction between the control device and external equipment. The data socket 201 connects to the motor drive module of the turntable or antenna tower via a shielded cable. The shielded cable effectively prevents external electromagnetic interference from affecting the control signal, ensuring that the control device accurately sends pulse signals to the motor driver, achieving precise control of the motor. The fiber optic coupler 301 connects to the host computer terminal via an optical fiber. Optical fiber has advantages such as strong anti-electromagnetic interference capability and high transmission speed, ensuring stable and high-speed data communication between the control device and the host computer terminal, facilitating remote operation and monitoring by users through host computer software.

[0048] In one embodiment, a fan 500 is mounted on the side of the shielded enclosure 100, and a shielded ventilation window 501 is installed at both the air inlet and outlet of the fan 500. It should be understood that during device operation, internal components generate heat; if this heat cannot be dissipated in time, it may lead to performance degradation or even damage to the components. The fan 500 mounted on the shielded enclosure 100 effectively dissipates heat inside the enclosure, ensuring that each module and device operates in a suitable temperature environment. The shielded ventilation windows 501 installed at the air inlet and outlet of the fan 500 not only meet ventilation and heat dissipation requirements but also prevent the introduction of external electromagnetic interference due to the air vent openings, maintaining a good electromagnetic environment within the shielded enclosure 100 and ensuring normal device operation. A power supply is drawn from the output of the AC power filter 401 to the fan 500, ensuring that the fan 500 receives stable power during operation, achieving effective heat dissipation within the shielded enclosure 100 and maintaining the device's optimal operating condition.

[0049] In one embodiment, the second output terminal of the AC-DC power module 400 is electrically connected to the data fiber optic transceiver 300, the first output terminal outputs DC5V to power the control circuit board 200, and the second output terminal outputs DC12V to power the data fiber optic transceiver 300.

[0050] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" in the above description indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0052] In the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0053] In this embodiment of the invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0054] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0055] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the appended claims.

Claims

1. A control device for a microwave anechoic chamber test system, characterized in that, The utility model relates to a shielded box, the shielded box is sealed cavity with cover, one side of the shielded box is equipped with power socket, data socket and fiber coupler, control circuit board is installed in the shielded box, the control circuit board integrates servo motor control unit, step motor control unit, power supply interface and communication interface, wherein the input end of the data socket is electrically connected with the interface of the servo motor control unit or the interface of the step motor control unit, AC-DC power module is installed in the shielded box, the input end of the AC-DC power module is electrically connected with the output end of the power socket, the first output end of the AC-DC power module is connected with the power supply interface, data fiber transceiver is electrically connected with the fiber coupler at one end and is electrically connected with the communication interface at the other end. The cover and the box gap are provided with conductive sponge strips. The shielded box is made of stainless steel or other metal material sheet metal part bending, all spliced gaps are continuous full welding, the outer side of the shielded box is welded with L-shaped mounting plate. The control circuit board further integrates one or more of electromagnetic valve control unit, stroke control unit and DC motor control unit, the control interface of the stroke control unit is connected with DC power filter and DB9 filter connector in sequence through cable, and then is connected with the limit switch of turntable or antenna tower through external shielded cable. The input end of the power socket is connected with the commercial power, and the output end of the power socket is connected with the input end of the AC-DC power module through fuse and AC power filter in sequence. The shielded box is provided with a movable partition plate, dividing the cavity into two layers, the AC-DC power module, the AC power filter and the DC power filter are installed at the bottom of the box, and the control circuit board and the data fiber transceiver are installed on the movable partition plate.

2. The control device for a microwave anechoic chamber test system according to claim 1, characterized in that A small metal shielding box is arranged at the position of the power socket in the shielded box, and a pair of feedthrough filters are installed on the small metal shielding box.

3. The control device for a microwave anechoic chamber test system of claim 1, wherein, The data socket is connected with the motor drive module of the turntable or antenna tower through shielded cable, and the fiber coupler is connected with the host terminal through optical fiber.

4. The control device for a microwave anechoic chamber test system of claim 1, wherein, A fan is installed on the side of the shielded box, and a shielding ventilation window is installed on the air inlet and air outlet of the fan.

5. The control device for a microwave anechoic chamber test system according to claim 4, characterized in that The second output end of the AC-DC power module is electrically connected with the data fiber transceiver, the first output end outputs DC5V to supply power to the control circuit board, and the second output end outputs DC12V to supply power to the data fiber transceiver.

6. The control device for a microwave anechoic chamber test system according to claim 5, wherein, ​ 7. The control device for a microwave anechoic chamber test system according to claim 6, characterized in that ​ 8. The control device for a microwave anechoic chamber test system of claim 1, wherein, ​ 9. The control device for a microwave anechoic chamber test system of claim 1, wherein, ​ 10. The control device for a microwave anechoic chamber test system of claim 1, wherein, ​

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