Electrostatic discharge test static gun return wire isolation device

Abstract

The utility model belongs to the technical field of electromagnetic compatibility tests, and discloses an electrostatic discharge test electrostatic gun return wire isolation device, which comprises a fixed base, the upper surface of the fixed base is vertically connected with a supporting part, and the periphery of the supporting part is sleeved with a rotatably fixed limiting frame; the limiting frame is provided with a notch used for placing a cable, and the electrostatic gun discharge loop cable is limited in the range surrounded by the frame. The limiting frame is rotationally and fixedly connected to the periphery of the supporting stand column in a sleeving mode and used for limiting the discharging loop cable of the electrostatic gun within the range surrounded by the frame and can move in a self-adaptive mode along with stress pulling, and the distance between the discharging loop cable, with the length being 2 m, of the electrostatic gun and other conductive parts of test configuration is kept not smaller than 0.2 m. And meanwhile, the discharge loop cable has a relatively large movable range to ensure that the electrostatic gun has a relatively large operable space in the test, so that the convenience of the electrostatic discharge immunity test and the accuracy of test data are further improved.

Description

Technical Field

[0001] The utility model relates to an electrostatic gun return line isolation device for electrostatic discharge tests, belonging to the technical field of electromagnetic compatibility tests. Background Art

[0002] Electromagnetic compatibility (EMC) refers to the ability of a device or system to operate normally in its electromagnetic environment and not generate intolerable electromagnetic interference to other devices. Electromagnetic compatibility tests include two categories: electromagnetic emission and electromagnetic susceptibility tests. Among them, the electrostatic discharge test is part of the electromagnetic immunity test. The electrostatic discharge test mainly simulates the electrostatic discharge phenomenon generated when a human body or other objects come into contact with an electronic device, and evaluates the anti-interference ability of the device in such an environment.

[0003] In the electrostatic discharge test, the return line of the electrostatic gun (also known as the discharge loop or discharge path) is the discharge loop cable connected to the electrostatic gun, which affects the effectiveness and accuracy of the test. The length of the discharge loop cable is usually specified as 2 meters. If this length exceeds the length required for the selected discharge point, the excess length should be placed away from the ground reference plane in a non-inductive manner. Except for the ground reference plane, the discharge loop cable should maintain a distance of not less than 0.2 m from other conductive parts of the test configuration. In addition, the discharge loop cable needs to have sufficient insulation performance to prevent the discharge current from flowing through the cable port to personnel or the conductors of the test system during the test.

[0004] Chinese Patent No. 202310127767.X discloses a fixing device for the return line of an electrostatic discharge test electrostatic gun, as Figure 1 shown. The fixing device for the return line of the electrostatic gun includes a fixing member 1, a connecting member 2, and several limiting members 3. The fixing member 1 is of a fan-shaped structure. One side of the bottom of the fixing member 1 is installed externally through the connecting member 2. Several limiting members 3 are evenly installed on the outer arc surface section of the fixing member 1. The limiting members 3 are used to limit the return line of the electrostatic gun. The connecting member 2 of the fixing device for the return line of the electrostatic gun is of a cylindrical stud structure, which easily causes the fan-shaped fixing member 1 to rotate accidentally. When the fixing member 1 rotates more than 90°, the discharge loop cable of the electrostatic gun will contact the electrostatic discharge test table, thus affecting the test results. Secondly, the fixing member 1 of the fixing device for the return line of the electrostatic gun is of a fan-shaped structure, which will make the routing distance of the return line of the electrostatic gun too long, thus reducing the operable space of the electrostatic gun in the test. Finally, the groove of the limiting member 3 limits and fixes the return line of the electrostatic gun, which will make the return line of the electrostatic gun have no movable space, further affecting the operable space of the electrostatic gun in the test, and thus affecting the test operation.

[0005] Currently, in the electrostatic discharge test, the treatment of the cable in the discharge loop of the electrostatic gun still mainly relies on the insulating layer on the surface of the discharge loop cable to isolate it from other conductors, which cannot meet the standard requirements for a distance of 0.2 m and may affect the waveform of the discharge current, including parameters such as the rise time, peak current, and duration. SUMMARY OF THE INVENTION

[0006] The technical problem to be solved by the present invention is: in the electrostatic discharge immunity test, to achieve a distance of not less than 0.2 m between the 2 m long discharge loop cable of the electrostatic gun and other conductive parts of the test configuration, and at the same time, the discharge loop cable has a large movable range to ensure that the electrostatic gun has a large operating space during the test, thereby further improving the convenience of the electrostatic discharge immunity test and the accuracy of the test data.

[0007] To achieve the above object, the technical solution of the present invention provides an isolation device for the return line of an electrostatic gun in an electrostatic discharge test, including a fixed base, on the upper surface of which a support part is vertically connected, and a limit frame that can be rotatably fixed is sleeved on the outer periphery of the support part; the limit frame has a notch for placing the cable, and the discharge loop cable of the electrostatic gun is limited within the range surrounded by the frame.

[0008] Preferably, a collar is sleeved on the outer periphery of the support part, and the limit frame is fixedly connected to the outer wall of the collar, and the collar drives the limit frame to rotate along the outer periphery of the support part.

[0009] Preferably, the corresponding position of the support column and the collar is a cavity structure, a spring is fixedly connected in the cavity, one end of the spring is fixedly connected with a limit protrusion, the limit protrusion penetrates through the outer wall of the support column, and a limit hole matching the limit protrusion is opened on the outer peripheral surface of the corresponding collar. The limit protrusion swings in the direction of the limit hole, so that the limit frame can rotate left and right relative to the axis of the support column.

[0010] Preferably, the fixed base is provided with a wire passing notch, and the discharge loop cable connected to the ground reference plane passes through the wire passing notch to the limit frame.

[0011] Preferably, the opening direction of the wire passing notch of the fixed base is opposite to the notch direction of the limit frame.

[0012] Preferably, there are 3 limit frames, which are distributed along the length direction of the support part.

[0013] Preferably, the rotatable angle of the collar relative to the axis of the support column is 30° on each of the left and right sides, which is convenient for the discharge loop cable to move adaptively when being pulled by stress during the test.

[0014] Preferably, universal wheels are provided on the bottom surface of the fixed base.

[0015] Preferably, the universal wheel has a locking function to lock the static gun return line isolation device after it is moved to a suitable position, preventing the device from accidentally moving under the pulling stress of the discharge loop cable.

[0016] The beneficial effects of the present utility model are as follows: Aiming at the problem that the discharge loop cable in the current electrostatic discharge test is prone to deviate from the standard requirement of a 0.2 m distance, three limiting frames are fixed on the support column with a fixed base. Among them, the limiting frame is connected to the support column through a ring sleeve and can rotate 30° to the left and right respectively. It is used to limit the static gun discharge loop cable within the range surrounded by the frame and can move adaptively with the stress pulling, so as to ensure that the 2 m long discharge loop cable of the static gun keeps a distance of not less than 0.2 m from other conductive parts of the test configuration. At the same time, the discharge loop cable has a large movable range to ensure that the static gun has a large operating space during the test, thereby further improving the convenience of the electrostatic discharge immunity test and the accuracy of the test data. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of an existing static gun return line fixing device for electrostatic discharge testing;

[0018] Figure 2 is a schematic structural diagram of an embodiment of the static gun return line isolation device for electrostatic discharge testing of the present utility model;

[0019] Figure 3 is a schematic structural diagram of the connecting ring sleeve in the static gun return line isolation device for electrostatic discharge testing of the present utility model;

[0020] Figure 4 is a schematic structural diagram of the limiting spring column in the static gun return line isolation device for electrostatic discharge testing of the present utility model.

[0021] In the figure, 1 - support column, 101 - spring, 102 - limiting protrusion, 2 - limiting frame, 3 - fixed base, 4 - universal wheel, 5 - collar, 501 - limiting hole. Detailed Embodiments

[0022] The following further elaborates the present utility model in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present utility model and not to limit the scope of the present utility model. In addition, it should be understood that after reading the content taught by the present utility model, those skilled in the art can make various changes or modifications to the present utility model, and these equivalent forms also fall within the scope defined by the appended claims of this application.

[0023] See Figure 2, an electrostatic discharge test electrostatic gun return line isolation device disclosed in an embodiment of the present application includes a fixed base 3, on the upper surface of which a support column 1 is vertically connected. A limit frame 2 is sleeved on the outer periphery of the support column 1. The limit frame 2 is a non-metallic insulating rigid frame with a notch, which is used to limit the electrostatic gun discharge loop cable within the range surrounded by the frame, so as to ensure that the discharge loop cable is at a distance of not less than 0.2 m from other conductive parts of the test configuration. Preferably, the support column 1 is a non-metallic insulating rigid pipe column, which is used to support each component of the electrostatic gun return line isolation device in the vertical direction; the diameter of the support column 1 is 5 cm, and the length is (1.0 - 1.2) m; there can be multiple limit frames 2, such as two, three or more, and an appropriate number of limit frames 2 is selected according to the usage scenario and distributed along the length direction of the support column 1. The limit frame 2 can be selected as a rectangular frame or an oval frame according to the processing technology. The length of the limit frame is (20 - 40) cm, and the width is (10 - 20) cm; the notch length of the limit frame is (5 - 15) cm.

[0024] In this embodiment, referring to Figures 2 - 4 , a collar 5 is sleeved on the outer periphery of the support column 1, and the limit frame 2 is fixedly connected to the outer wall of the collar 5. The vertical center line of the limit frame 2 coincides with the axis of the collar 5; the corresponding position of the support column 1 and the collar 5 is a cavity structure, and a spring 101 is fixedly connected in the cavity. One end of the spring 101 is fixedly connected with a limit protrusion 102. The limit protrusion 102 penetrates through the outer wall of the support column 1, and a limit hole 501 matching the limit protrusion 102 is opened on the outer peripheral surface of the corresponding collar 5. The limit hole 501 is elongated, and the limit protrusion 102 swings in the direction of the limit hole 501, so that the limit frame 2 can rotate 30° to the left and right relative to the axis of the support column 1, facilitating the adaptive movement of the discharge loop cable during the test when being pulled by stress.

[0025] In this embodiment, referring to Figure 2 , the fixed base 3 is a non-metallic insulating rigid base with a wire-passing notch, which is used to connect the support column 1 and stably fix it to maintain a vertical state; the width of the wire-passing notch of the fixed base 3 is (3 - 8) cm, and the depth extends from the edge towards the support column 1 and does not exceed the support column 1 to ensure the mechanical strength of the structure of the fixed base 3; the fixed base 3 has a wire-passing notch so that the discharge loop cable connected to the ground reference plate can pass through the wire-passing notch to the limit frame 2.

[0026] In this embodiment, the opening direction of the wire-passing notch of the fixed base 3 is opposite to the notch direction of the limit frame 2, so that the redundant discharge loop cable can fall on the fixed base 3.

[0027] In this embodiment, universal wheels 4 are arranged on the bottom surface of the fixed base 3; the universal wheels 4 are respectively fixed at the four corners of the fixed base 3 to facilitate the movement of the entire electrostatic gun return line isolation device; the universal wheels 4 have a locking function so as to lock the electrostatic gun return line isolation device after it is moved to a suitable position to prevent the device from accidentally moving under the pulling stress of the discharge loop cable.

Claims

1. An electrostatic discharge test electrostatic gun return line isolation device, characterized in that: It comprises a fixed base, the upper surface of which is vertically connected with a support part, and the outer periphery of the support part is sleeved with a rotatable and fixed limiting frame; the limiting frame has a notch for placing cables, and the discharge loop cable of the electrostatic gun is limited within the range surrounded by the frame.

2. The electrostatic discharge test electrostatic gun return line isolation device according to claim 1, characterized in that: A sleeve ring is sleeved on the outer periphery of the support part, and a limiting frame is fixedly connected to the outer wall of the sleeve ring. The sleeve ring drives the limiting frame to rotate along the outer periphery of the support part.

3. The electrostatic discharge test electrostatic gun return line isolation device according to claim 2, characterized in that: The corresponding positions of the support part and the ring are cavity structures, and a spring is fixedly connected in the cavity. One end of the spring is fixedly connected to a limiting protrusion, which passes through the outer wall of the support part. The corresponding outer peripheral surface of the ring is provided with a limiting hole matching the limiting protrusion. The limiting protrusion swings in the direction of the limiting hole so that the limiting frame can rotate left and right relative to the axis of the support part.

4. The electrostatic discharge test electrostatic gun return line isolation device according to claim 1, characterized in that: The fixed base is provided with a wire-passing notch, and the discharge loop cable connected to the ground reference plate passes through the wire-passing notch to the limiting frame.

5. The electrostatic discharge test electrostatic gun return line isolation device as claimed in claim 3, characterized in that: The opening direction of the wire-crossing notch of the fixed base is opposite to the notch direction of the limiting frame.

6. The electrostatic discharge test electrostatic gun return line isolation device according to claim 1, characterized in that: There are three limit frames distributed along the length direction of the support part.

7. The electrostatic discharge test electrostatic gun return line isolation device as claimed in claim 3, characterized in that: The rotatable angle of the collar relative to the axis of the supporting column is 30° on both sides, so that the discharge loop cable can move adaptively when pulled by stress during the test.

8. The electrostatic discharge test electrostatic gun return line isolation device according to any one of claims 1 to 7, characterized in that: The bottom surface of the fixed base is provided with universal wheels.

9. The electrostatic discharge test electrostatic gun return line isolation device according to claim 8, characterized in that: The universal wheel has a locking function.

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