Faraday cage device for calibrating electrostatic discharge simulator

Abstract

The invention provides a Faraday cage device for calibration of an electrostatic discharge simulator, which is used for solving the problem of electromagnetic interference during calibration of the electrostatic discharge simulator and has the advantages of better shielding performance, heat dissipation performance and the like. The device comprises a box body and a box door, the box door is connected with the box body through a hinge, a lock catch structure is arranged at the opening and closing position of the box body and the box door, and a door handle is installed on the left side of the box door; an electrostatic discharge target and a grounding pole are installed on the left side of the outer surface of the box body, and the grounding pole is located under the target center of the electrostatic discharge target. A partition plate is arranged in the box body and is lower than the electrostatic discharge target; a coaxial flange connected to the outside of the box body is arranged on the rear side of the inner surface of the box body and is higher than the partition plate; and the power supply filter is arranged on the rear side of the inner surface of the box body and is lower than the partition plate.

Description

Technical Field

[0001] The present application relates to the technical field of electrostatic discharge testing, and in particular to a Faraday cage device used for calibrating an electrostatic discharge simulator. Background Art

[0002] The electrostatic discharge sensitivity test is a key electromagnetic compatibility test project, and the key test equipment used in this project is the electrostatic discharge simulator. The calibration accuracy of the electrostatic pulse parameters directly affects the accuracy of the measurement results. The defense science and technology industry has always attached great importance to the calibration of the electrostatic discharge simulator. The electrostatic discharge test is generally completed in accordance with the IEC61000-4-2 standard method internationally. In order to avoid unnecessary triggering of the calibration system during calibration and improve the anti-interference of the calibration system, it is preferred to use a Faraday cage to complete the calibration of the electrostatic discharge simulator.

[0003] The traditional Faraday cage is a closed cage-like structure made of metal or other good conductors, and its working principle is based on electrostatic balance and electromagnetic shielding. When external electromagnetic waves (including electrostatic discharge) enter the Faraday cage, the charges are distributed on the surface of the metal grid to achieve electrostatic balance. Due to the high conductivity of metal, induced currents are generated in the metal grid and absorb electromagnetic waves, thereby preventing them from propagating inside.

[0004] However, although the traditional Faraday cage performs well in electromagnetic shielding and electrostatic protection, it is limited by its structure and cannot be directly used in electrostatic calibration. If the Faraday cage is directly modified, it is necessary to be careful not to destroy the shielding effectiveness, because the shielding effect of the Faraday cage depends on the continuity and conductivity of the metal grid. Usually, holes, doors and windows are weak points in shielding effectiveness. The main standard for electrostatic discharge calibration is a high-sampling oscilloscope. When working for a long time, because the Faraday cage is a closed box, a lot of heat will be generated inside. It is necessary to solve the heat dissipation problem of the system without affecting the shielding effectiveness as much as possible.

[0005] Therefore, how to design a Faraday cage device to solve the electromagnetic interference problem during the calibration of the electrostatic discharge simulator and have advantages such as better shielding performance and heat dissipation performance is a problem that needs to be solved at present. Summary of the invention

[0006] An embodiment of the present application provides a Faraday cage device used for calibrating an electrostatic discharge simulator, which solves the electromagnetic interference problem during the calibration of the electrostatic discharge simulator and has the advantages of better shielding performance, heat dissipation performance, etc.

[0007] In order to achieve the above objectives, this application adopts the following technical solutions:

[0008] In a first aspect, the present application provides a Faraday cage device for use in calibrating an electrostatic discharge simulator, which is used to solve the electromagnetic interference problem during the calibration of the electrostatic discharge simulator. The device includes a box body and a box door, the box door is connected to the box body through a hinge, a lock structure is provided at the opening and closing of the box body and the box door, and a door handle is installed on the left side of the box door;

[0009] An electrostatic discharge target and a grounding column are installed on the left side of the outer surface of the box, and the grounding column is directly below the center of the electrostatic discharge target;

[0010] A partition is installed in the box at a position lower than the electrostatic discharge target;

[0011] A coaxial flange connected to the outside of the box is provided on the rear side of the inner surface of the box and at a position higher than the partition;

[0012] A power filter is arranged on the rear side of the inner surface of the box and at a position lower than the partition plate.

[0013] In a possible design solution, the device of the first aspect further includes that the material of the box body and the box door is metal material.

[0014] A possible design scheme, the device of the first aspect also includes that the door and the door frame of the box body are equipped with shielding metal springs in a circle, and when the door is closed, the shielding metal springs on the door and the box body are inserted into each other to ensure the shielding effectiveness between the door and the box body.

[0015] In a possible design, the device of the first aspect further includes that the left side width of the outer surface of the box body is greater than 1.2 meters, and the distance between the center of the electrostatic discharge target and the left side edge of the outer surface of the box body is greater than 0.6 meters.

[0016] In a possible design scheme, the device of the first aspect further includes that the left side length of the outer surface of the box body is greater than 0.5 meters, and the grounding column is 0.5 meters directly below the electrostatic discharge target.

[0017] In a possible design solution, the device of the first aspect further includes that the electrostatic discharge target is an electrostatic discharge target that complies with the IEC61000-4-2 standard.

[0018] A possible design scheme, the device of the first aspect also includes that a shielding glass is installed on the box door through a metal fixing frame and metal screws, the shielding glass is surrounded by conductive material, and the shielding glass is transparent, and is used to observe the internal state of the box when the box door is closed.

[0019] A possible design scheme, the device of the first aspect also includes a ventilation waveguide window on the rear side of the inner surface of the box and above the partition, which is used to solve the heat dissipation problem when an oscilloscope is placed on the partition for electrostatic discharge simulator calibration.

[0020] In a possible design scheme, the device of the first aspect also includes that four universal wheels are arranged below the bottom of the box body, and are respectively installed on each corner below the bottom of the box body for adjusting the position of the device.

[0021] In a possible design scheme, the device of the first aspect also includes that there are two locking structures, one of which is installed at the upper part and the other is installed at the lower part.

[0022] In the embodiment of the present application, the Faraday cage device solves the grounding problem during the calibration of the electrostatic discharge simulator by setting a grounding column just below the center of the target of the electrostatic discharge target; by setting a coaxial flange connected to the outside of the box, the photoelectric program control of the oscilloscope can be realized when the oscilloscope is placed inside for subsequent operation, and the shielding effectiveness of the device will not be destroyed; and by setting the box door and the door frame of the box to be installed with shielding metal reeds in a circle, the shielding effectiveness between the box door and the box is ensured; by setting shielding glass, when the box door is closed, the internal state of the box is observed, the number of times the box door is opened and closed is reduced as much as possible, and the service life of the shielding metal reed is extended; by setting a ventilation waveguide window, the heat dissipation problem when the oscilloscope is placed on the partition for electrostatic discharge simulator calibration is solved. In short, the electromagnetic interference problem during the calibration of the electrostatic discharge simulator is solved, and it has the advantages of better shielding performance and heat dissipation performance.

[0023] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A front schematic diagram of a Faraday cage device used for calibrating an electrostatic discharge simulator provided in an embodiment of the present application;

[0026] Figure 2 A schematic diagram of the left side of a Faraday cage device used for calibrating an electrostatic discharge simulator provided in an embodiment of the present application;

[0027] Figure 3 A schematic diagram of the right side of a Faraday cage device used for calibrating an electrostatic discharge simulator provided in an embodiment of the present application;

[0028] Figure 4 A schematic diagram of a Faraday cage device after opening the door for use in calibrating an electrostatic discharge simulator provided in an embodiment of the present application;

[0029] Figure 5 A schematic diagram of the interior of a box door of a Faraday cage device used for calibrating an electrostatic discharge simulator provided in an embodiment of the present application;

[0030] Explanation of the accompanying drawings: 1. Box body, 2. Box door, 3. Door handle, 4. Lock structure one, 5. Lock structure two, 6. Electrostatic discharge target, 7. Grounding column, 8. Partition, 9. Coaxial flange, 10. Power supply filter, 11. Shielding metal reed, 12. Shielding glass, 13. Metal fixing frame, 14. Metal screws, 15. Ventilation waveguide window, 16. Universal wheel, 17. Power supply, 18. Half-bracket. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of this specification more clear, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are part of the embodiments of this specification, not all of the embodiments. The components of the embodiments of this specification described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present specification provided in the accompanying drawings is not intended to limit the scope of the present specification to be protected, but merely represents selected embodiments of the present specification. Based on the embodiments in the present specification, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present specification.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0034] In the description of the embodiments of this specification, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the application is usually placed when in use. It is only for the convenience of describing this specification and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on this specification. In addition, if the terms "first", "second", "third", etc. appear, they are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0035] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0036] In the description of the embodiments of this specification, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this specification can be understood according to specific circumstances.

[0037] The following will specifically introduce a Faraday cage device used for electrostatic discharge simulator calibration in this application, which is used to solve the electromagnetic interference problem during the calibration of electrostatic discharge simulator, and has better shielding performance, heat dissipation performance, etc., and can be specifically applied to electromagnetic compatibility measurement units and test institutions in domestic military, automotive, electronics and other industries. The structure of this Faraday cage device can be referred to Figures 1 to 5 Understand, detailed introduction below.

[0038] The Faraday cage device comprises a box body 1 and a box door 2; the box door 2 is connected to the box body 1 through a hinge, a lock structure is provided at the opening and closing parts of the box body 1 and the box door 2, and a door handle 3 is installed on the left side of the box door 2; an electrostatic discharge target 6 and a grounding column 7 are installed on the left side of the outer surface of the box body 1, and the grounding column 7 is directly below the center of the electrostatic discharge target 6; a partition 8 is installed in the box body 1 at a position lower than the electrostatic discharge target 6; a coaxial flange 9 connected to the outside of the box body 1 is provided at a rear side of the inner surface of the box body 1 and at a position higher than the partition 8; a power filter 10 is provided at a rear side of the inner surface of the box body 1 and at a position lower than the partition 8.

[0039] Among them, the door 2 is connected to the box body 1 through a hinge. Specifically, at least one hinge (or hinge) is set at the connection between the box body 1 and the door 2. One part of the hinge is fixed on the box body 1, and the other part is fixed on the door 2, thereby forming a rotatable connection point, so that the door of the Faraday cage can be easily opened and closed while maintaining a good electromagnetic shielding effect.

[0040] Optionally, there are two lock structures, lock structure 1 and lock structure 2 (the two are substantially the same), one of which is installed at the upper part and the other is installed at the lower part. One part of the lock structure is fixed on the box body 1, and the other part is fixed on the box door 2. When the box door 2 needs to be closed, the lock rod or pin on the box door 2 is moved to dock with the lock structure on the box body 1, thereby fixing the box door 2 and ensuring the safe closure of the box door. In addition, one lock structure can also be set, or more than two, which is not limited here.

[0041] The box body 1 and the door 2 are made of metal, that is, the top, bottom, left side, right side, rear side of the box body 1 and the door 2 are all made of metal. The box body 1 and the door 2 of the Faraday cage are made of metal because metal has good electrical conductivity and can effectively shield external electromagnetic waves from entering the cage.

[0042] Optionally, a circle of the door frame of the box door 2 and the box body 1 are installed with shielding metal reeds 11. When the box door 2 is closed, the shielding metal reeds on the box door 2 and the box body 1 are inserted into each other. It can be understood that the shielding metal reed is a component that suppresses electromagnetic interference (EMI) and electrostatic discharge (ESD) through its metal elasticity and conductivity properties. It ensures the stability and reliability of electronic equipment by providing elastic sealing, reducing electromagnetic wave leakage, and preventing external interference from entering the interior of the device. In addition, the metal reed also has good durability and fatigue resistance, and can maintain an effective electromagnetic shielding effect during long-term use. In this application, the shielding effectiveness between the box door 2 and the box body 1 is ensured by installing a shielding metal reed.

[0043] It should also be noted that, in the example of the present application, the left width of the outer surface of the box 1 is greater than 1.2 meters, and the distance between the target-center of the electrostatic discharge target 6 and the left edge of the outer surface of the box 1 is greater than 0.6 meters; and the left length of the outer surface of the box 1 is greater than 0.5 meters, and the grounding post 7 is 0.5 meters directly below the electrostatic discharge target 6. The electrostatic discharge target is used to connect to the electrostatic discharge simulator during the subsequent electrostatic discharge simulator calibration, and the grounding post solves the grounding problem during the electrostatic discharge simulator calibration.

[0044] In addition, the width and height of the left side of the box body are only an example, and other sizes can be selected and made according to specific needs, which are not limited here.

[0045] Optionally, the ESD target 6 is an ESD target that complies with the IEC61000-4-2 standard, and an ESD target that complies with the IEC61000-4-2 standard can ensure standardization of the test process and test results, ensure comparability between different devices, and effectively evaluate the anti-static discharge capability of the device.

[0046] It should also be noted that a partition 8 is installed in the box 1 at a position lower than the electrostatic discharge target 6. The partition 8 is fixed using a half-bracket 18. The partition 8 is used to place devices such as an oscilloscope when calibrating the electrostatic discharge simulator.

[0047] In addition, a coaxial flange 9 connected to the outside of the box 1 is provided on the rear side of the inner surface of the box 1 and at a position higher than the partition 8. Through the coaxial flange 9, the data collected by the oscilloscope can be connected to the outside of the box through the network cable to the optical fiber, thereby realizing the program control of the oscilloscope and avoiding directly passing the network cable through the box opening to destroy the shielding effectiveness of the Faraday cage device.

[0048] A power filter 10 is provided at the rear side of the inner surface of the box 1 and below the partition 8. The Faraday cage device needs to be powered by a 220V power filter to reduce the interference of the external environment on the oscilloscope power injection. The power filter 10 is directly installed on the housing, and the power supply 17 is placed outside the box during installation, which also avoids directly passing the power cord through the box opening, thereby destroying the shielding effectiveness of the Faraday cage device.

[0049] Optionally, a shielding glass 12 is installed on the box door 2 through a metal fixing frame 13 and metal screws 14. The shielding glass 12 is surrounded by conductive material and is transparent. It is used to observe the state of an oscilloscope placed inside the box body 1 when the box door 2 is closed. It can minimize the number of times the shielding door is opened and closed, and extend the service life of the above-mentioned shielding metal reed 11.

[0050] It should also be noted that the shielding glass 12 is installed on the door 2 by means of a metal fixing frame 13 and metal screws 14. The specific installation steps can be understood as first, carefully placing the glass into the glass placement groove of the metal box 1, ensuring that the glass is fully aligned and firmly placed in the groove. Next, align the metal frame with the edge of the glass, and use metal screws 14 or other fixing devices such as metal screws to fix the metal frame to the metal box 1, ensuring that the frame firmly presses the glass. In addition, during the installation process, be careful to avoid impact or uneven pressure on the glass to prevent it from breaking. If necessary, metal conductive strips or gaskets can also be used to enhance sealing and reduce vibration.

[0051] Optionally, a ventilation waveguide window 15 is provided on the rear side of the inner surface of the box body 1 and at a position higher than the partition 8 to solve the heat dissipation problem when an oscilloscope is placed on the partition for electrostatic discharge simulator calibration.

[0052] Optionally, four universal wheels 16 are provided below the bottom of the box 1 and are installed at each corner below the bottom of the box 1 respectively, for adjusting the position of the device, that is, achieving smooth movement of the Faraday cage device forward, backward, left and right.

[0053] In summary, the Faraday cage device solves the grounding problem during the calibration of the electrostatic discharge simulator by setting a grounding column just below the center of the target of the electrostatic discharge target; by setting a coaxial flange connected to the outside of the box, the photoelectric control of the oscilloscope can be realized when the oscilloscope is placed inside for subsequent operation, and the shielding effectiveness of the device will not be destroyed; and by setting the box door and the door frame of the box to be installed with shielding metal reeds around the box, the shielding effectiveness between the box door and the box is ensured; by setting shielding glass, when the box door is closed, the internal state of the box is observed, the number of times the box door is opened and closed is reduced as much as possible, and the service life of the shielding metal reed is extended; by setting a ventilation waveguide window, the heat dissipation problem when the oscilloscope is placed on the partition for electrostatic discharge simulator calibration is solved. In short, the electromagnetic interference problem during the calibration of the electrostatic discharge simulator is solved, and it has the advantages of better shielding performance and heat dissipation performance.

[0054] Combination of the above Figure 1-Figure 5 The Faraday cage device used for calibrating the electrostatic discharge simulator provided in the embodiment of the present application is described in detail. The specific application scenarios of the Faraday cage device used for calibrating the electrostatic discharge simulator are introduced below.

[0055] When calibrating the electrostatic discharge simulator, the oscilloscope is placed on the partition 8 inside the box 1 .

[0056] The outside of the electrostatic discharge target 6 is connected to the gun head of the electrostatic discharge simulator, and the output end of the electrostatic discharge target 6 is connected to an attenuator, a coaxial cable, and finally connected to an oscilloscope.

[0057] The oscilloscope power line is connected to the power filtered by the power filter 10 in the box 1 .

[0058] The programmable network cable of the oscilloscope is converted into optical fiber through the network-to-fiber module, and then passes through the coaxial flange 9 on the rear side of the box 1 to the outside of the box, connected to an optical fiber-to-network module and then to a programmable computer. The oscilloscope can be controlled by the computer subsequently, such as setting the trigger position parameters of the oscilloscope and waveform image acquisition according to the calibration specifications.

[0059] Then move the lock rod or pin on the door 2 to make it dock with the lock structure on the box body 1, and close the door 2.

[0060] The electrostatic discharge simulator can then be calibrated according to the calibration specification requirements.

[0061] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present disclosure (including the claims) is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present application as above, which are not provided in detail for the sake of simplicity.

[0062] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A Faraday cage device used for electrostatic discharge simulator calibration, used to solve the electromagnetic interference problem during electrostatic discharge simulator calibration, the device comprises a box body and a box door, characterized in that: The box door is connected to the box body through a hinge, a lock structure is provided at the opening and closing of the box body and the box door, and a door handle is installed on the left side of the box door; An electrostatic discharge target and a grounding column are installed on the left side of the outer surface of the box, and the grounding column is directly below the center of the electrostatic discharge target; A partition is installed in the box at a position lower than the electrostatic discharge target; A coaxial flange connected to the outside of the box is provided at a rear side of the inner surface of the box and at a position higher than the partition; A power filter is arranged at the rear side of the inner surface of the box and at a position lower than the partition.

2. The Faraday cage device for calibrating an electrostatic discharge simulator according to claim 1, characterized in that: The box body and the box door are made of metal.

3. The Faraday cage device for calibrating an electrostatic discharge simulator according to claim 1, characterized in that: The door and the door frame of the box body are both equipped with shielding metal springs. When the door is closed, the shielding metal springs on the door and the box body are inserted into each other to ensure the shielding effectiveness between the door and the box body.

4. The Faraday cage device for calibrating an electrostatic discharge simulator according to claim 1, characterized in that: The left side width of the outer surface of the box body is greater than 1.2 meters, and the distance between the center of the electrostatic discharge target and the left side edge of the outer surface of the box body is greater than 0.6 meters.

5. The Faraday cage device used for calibrating an electrostatic discharge simulator according to claim 4, characterized in that: The left side length of the outer surface of the box body is greater than 0.5 meters, and the grounding column is 0.5 meters directly below the electrostatic discharge target.

6. The Faraday cage device used for calibrating an electrostatic discharge simulator according to claim 1, characterized in that: The electrostatic discharge target is an electrostatic discharge target that complies with the IEC61000-4-2 standard.

7. The Faraday cage device for calibrating an electrostatic discharge simulator according to claim 1, characterized in that: A shielding glass is installed on the box door through a metal fixing frame and metal screws. The shielding glass is surrounded by conductive materials and is transparent. It is used to observe the internal state of the box when the box door is closed.

8. The Faraday cage device used for calibrating an electrostatic discharge simulator according to claim 1, characterized in that: A ventilation waveguide window is provided on the rear side of the inner surface of the box and at a position higher than the partition, so as to solve the heat dissipation problem when an oscilloscope is placed on the partition for calibrating an electrostatic discharge simulator.

9. The Faraday cage device used for calibrating an electrostatic discharge simulator according to claim 1, characterized in that: Four universal wheels are arranged below the bottom of the box body, and are respectively installed on each corner below the bottom of the box body, so as to adjust the position of the device.

10. The Faraday cage device used for calibrating an electrostatic discharge simulator according to claim 1, characterized in that: There are two locking structures, one of which is installed at the upper part and the other is installed at the lower part.

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