Automatic discharge device of electrostatic discharge generator
By designing an automatic discharge device for electrostatic discharge generator, the problem of the charge at the electrostatic discharge gun head cannot be effectively discharged, the stability of the test voltage amplitude and the accuracy of the test results are achieved, and damage to the test equipment is avoided.
Patent Information
- Application Number
- CN202421884926.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-05
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-08-05
AI Technical Summary
In electrostatic discharge test, the charge accumulated by the electrostatic discharge gun head cannot be effectively discharged, resulting in unstable test voltage amplitude during non-conductive surface test, affecting the accuracy of the test, and direct contact with the grounding plate may cause undesirable electrostatic discharge to the test equipment.
An automatic discharge device for electrostatic discharge generator is designed, including a fixed base, front support frame, rear support frame, discharge carbon brush and conductive connection structure. The discharge carbon brush contacts the electrostatic discharge gun head and is grounded through the conductive connection structure to achieve automatic discharge of charge.
The test voltage amplitude of the electrostatic discharge pulse is ensured to be stable, the accuracy of the test results is improved, and damage to the test equipment is avoided.
Smart Images
Figure CN223051396U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an automatic discharge device for an electrostatic discharge generator, belonging to the technical field of electromagnetic compatibility testing. Background Art
[0002] Electrostatic discharge (ESD) is a natural phenomenon that usually occurs when a human body comes into contact with an electronic device. Due to reasons such as friction, the human body will accumulate charges. When the human body comes into contact with the device, the charges will be quickly released, forming an electrostatic discharge. This kind of discharge may cause damage to the electronic device and affect its normal operation. In order to evaluate the anti-interference ability of the device in such an environment, the electrostatic discharge test is introduced into the electromagnetic compatibility test.
[0003] An electrostatic discharge generator is used to simulate the electrostatic discharge phenomenon generated when a human body or other object comes into contact with an electronic device, and can evaluate the anti-interference ability of the device when it is subjected to electrostatic discharge. In the electrostatic discharge test, the tip of the electrostatic discharge generator accumulates charges, simulating the charge accumulation process when a human body or other object comes into contact with the device, and realizes the electrostatic discharge to the device by contacting the equipment under test (EUT). The amount of charge accumulated by the tip of the electrostatic discharge generator and the discharge method (contact discharge or air discharge) will affect the test results.
[0004] At present, the following problems exist in the electrostatic discharge test: First, when testing the EUT with a non-conductive surface, the charges accumulated by the tip cannot be effectively discharged, and the test voltage amplitude of consecutive multiple electrostatic discharge pulses will be affected, thus affecting the accuracy of the test; Second, if the tip is directly contacted with the grounding plate on the test table to discharge the abnormally accumulated charges, it will cause an unexpected electrostatic discharge to the EUT placed on the test table, thus affecting the test results. Summary of the Invention
[0005] The technical problem to be solved by the utility model is: during the electrostatic discharge pulse interval, the electrostatic discharge gun can be conveniently placed and the charges accumulated by the tip can be automatically discharged, ensuring the stability and accuracy of the test voltage amplitude of the electrostatic discharge pulse, thereby further improving the accuracy of the electrostatic discharge test results.
[0006] In order to achieve the above purpose, the technical solution of the utility model is to provide an automatic discharge device for an electrostatic discharge generator,
[0007] A fixed base;
[0008] A front support frame, fixed to the fixed base; having a first placement slot for accommodating the head of the electrostatic discharge gun;
[0009] A rear support frame, fixed to the fixed base; having a second placement slot for accommodating the tail of the electrostatic discharge gun;
[0010] A discharging carbon brush is arranged on one side of the front support frame, corresponding to the gun head of the electrostatic discharge gun, for discharging the charge accumulated on the gun head; and
[0011] A conductive connection structure, which has conductivity, with one end connected to the discharging carbon brush and the other end connected to the ground reference plane, for releasing the discharged charge.
[0012] Preferably, the conductive connection structure is a metal conductive connector connected to the discharging carbon brush, and the metal conductive connector is connected with a ground cable connected to the ground reference plane.
[0013] Preferably, the ground cable is provided with a discharging resistor connected in series, for limiting the current to discharge the charge accumulated on the gun head of the electrostatic discharge gun.
[0014] Preferably, the first placement notch matches the size of the head of the electrostatic discharge gun, and the second placement notch matches the size of the tail of the electrostatic discharge gun, to achieve stable support for the gun head of the electrostatic discharge gun.
[0015] Preferably, the front support frame and the rear support frame are made of non-metal hard insulating materials, and the first placement notch and the second placement notch respectively provided thereon are covered with soft buffer insulating materials, so that the electrostatic discharge gun and the corresponding placement notch are in soft contact.
[0016] Preferably, both the first placement notch and the second placement notch are "U"-shaped notches, and the openings penetrate through the upper surfaces of the corresponding support frames, facilitating the placement of the electrostatic discharge gun.
[0017] Preferably, it further includes a non-metal hard insulating cushion block, placed at the bottom of the metal conductive connector, for adjusting the height of the discharging carbon brush to fit with the gun head of the discharging electrostatic discharge gun.
[0018] Preferably, the height of the front support frame is less than the height of the rear support frame, facilitating the inclined placement of the electrostatic discharge gun, and the position of the gun head of the electrostatic discharge gun is more likely to be closely attached to the discharging carbon brush.
[0019] Preferably, the discharging resistor is a high-voltage resistant resistor, withstanding at least a transient voltage of 20 kV.
[0020] Preferably, the DC impedance of the entire discharging circuit path of the automatic discharging device is 930 - 1000 kΩ.
[0021] The beneficial effects of the present utility model are as follows: When performing an electrostatic discharge test on an EUT with a non-conductive surface currently, the charge accumulated on the gun head cannot be effectively discharged, which affects the accuracy of the test results. The front support frame is used to stably support the head of the electrostatic discharge gun, and the rear support frame is used to stably support the tail of the electrostatic discharge gun. The discharge carbon brush contacts the gun head of the electrostatic discharge gun and is grounded to the reference plane through a conductive connection structure, realizing the convenient placement of the electrostatic discharge gun and automatically discharging the charge accumulated on the gun head, ensuring the stability and accuracy of the test voltage amplitude of the electrostatic discharge pulse, thereby further improving the accuracy of the electrostatic discharge test results. Brief Description of the Drawings
[0022] Figure 1 It is a schematic structural diagram of an embodiment of the automatic discharge device of the electrostatic discharge generator of the present utility model.
[0023] In the figure, 1 - rear support frame, 11 - second placement notch, 2 - front support frame, 21 - first placement notch, 3 - discharge carbon brush, 4 - metal conductive connector, 5 - fixed base, 6 - discharge resistor. Specific Embodiments
[0024] The present utility model will be further described below 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.
[0025] See Figure 1, an automatic discharge device for an electrostatic discharge generator disclosed in this embodiment includes a fixed base 5, which is made of a non-metallic hard insulating material. The upper surface is provided with a front support frame 2 and a rear support frame 1 that are parallel to each other and have different heights. The front support frame 2 and the rear support frame 1 are respectively used to support the head and the tail of the electrostatic discharge gun. On one side of the front support frame 2, there is a discharge carbon brush 3 for discharging the accumulated charge at the head of the discharge gun. The discharge carbon brush 3 is a good conductive material made of carbon-based soft material, and it is located on the side pointed by the head of the electrostatic discharge gun. The gun head of the electrostatic discharge gun is in tight contact with the discharge carbon brush 3 to ensure the effective discharge of the charge accumulated at the head of the electrostatic discharge gun. The thickness of the fixed base 5 is 2 cm to 5 cm, and its peripheral contour can be triangular, circular or other irregular shapes. Preferably, it is rectangular, with a regular shape, easy to process, reducing the processing and production difficulty, and also facilitating the reservation of a placement space during use. Among them, the front support frame 2 and the rear support frame 1 are respectively provided with a first placement notch 21 and a second placement notch 11. Among them, the second placement notch 11 matches the size of the tail of the electrostatic discharge gun, and the first placement notch 21 matches the size of the head of the electrostatic discharge gun, both for stable support. Preferably, both the first placement notch 21 and the second placement notch 11 are "U"-shaped notches, and the openings penetrate the upper surfaces of the corresponding support frames, facilitating the placement of the electrostatic discharge gun.
[0026] The front support frame 2 and the rear support frame 1 are made of non-metallic hard insulating materials, which can not only support the electrostatic discharge gun well but also play an insulating role. The first placement notch 21 and the second placement notch 11 are covered with soft buffer insulating materials, making the electrostatic discharge gun and the support frame in soft contact to protect the contact surface between the electrostatic discharge gun and the support frame from being scratched.
[0027] In order to improve the discharge efficiency of the discharge carbon brush 3, the height of the front support frame 2 is less than the height of the rear support frame 1, so that the electrostatic discharge gun is placed obliquely, and the gun head position of the electrostatic discharge gun is closer to the discharge carbon brush 3, improving the discharge efficiency. Preferably, the height of the rear support frame 1 is 10 cm to 20 cm; the height of the front support frame 2 is 5 cm to 15 cm. Optimally, the height difference between the front support frame 2 and the rear support frame 1 is 5 cm, which can not only make the gun head of the electrostatic discharge gun close to the discharge carbon brush 3 but also maintain the stability of the electrostatic discharge gun, avoiding the problem of the electrostatic discharge gun slipping due to too large a difference. To match the height of the front support frame 2, the height of the discharge carbon brush 3 is shorter than the height of the front support frame 2, preferably 3 cm to 10 cm.
[0028] In this embodiment, it further includes a metal conductive connector 4 for connecting and fixing the discharge carbon brush 3; the metal conductive connector is made of a metal with good electrical conductivity, and the metal conductive connector 4 is of an existing structure, which will not be elaborated here; after the discharge carbon brush 3 and the metal conductive connector 4 are fixedly connected, a non-metallic hard insulating spacer with a certain height can be provided at the bottom of the metal conductive connector 4 to adjust the height of the discharge carbon brush 3 and improve its applicability. A non-metallic hard insulating spacer with a suitable height can be selected according to the distance between the discharge carbon brush 3 and the tip of the electrostatic discharge gun to make them closely fit and ensure the discharge effect.
[0029] In this embodiment, the horizontal dimension of the fixed base 5 should be at least 5 cm larger than the area formed by the rear support frame 1, the front support frame 2, the discharge carbon brush 3 and the metal conductive connector 4 to increase the support stability and prevent the device from accidentally tipping over after placing the electrostatic discharge gun.
[0030] In this embodiment, the ground reference plane is connected with a ground cable, and the ground cable also includes two series-connected discharge resistors 6. The other end of the ground cable is connected to the metal conductive connector 4 for limiting the current and discharging the charges accumulated at the tip of the electrostatic discharge gun; preferably, the discharge resistor 6 is a high-voltage-resistant resistor with a resistance value of 470 kΩ and should be able to withstand at least 20 kV of transient voltage. The surfaces of the two discharge resistors 6 and the ground cable connected thereto are covered with insulating materials to ensure good insulation when contacting other conductive objects. The appropriate number of discharge resistors 6 is selected according to the current-limiting requirements.
[0031] Among them, the discharge carbon brush 3, the metal conductive connector 4, the two discharge resistors 6, the ground cable and the ground reference plane form an electrostatic discharge circuit path for the charges accumulated at the tip of the electrostatic discharge gun, and the DC impedance of the entire path should preferably be (930 - 1000) kΩ.
Claims
1. An automatic discharge device for an electrostatic discharge generator, characterized in that: A fixed base; A front support frame, fixed to the fixed base, having a first placement slot for accommodating the head of the electrostatic discharge gun; A rear support frame fixed to the fixed base; having a second placement slot for accommodating the tail of the electrostatic discharge gun; A discharge carbon brush is arranged on one side of the front support frame, corresponding to the gun head of the electrostatic discharge gun, and discharges the charge accumulated in the gun head; and The conductive connection structure is conductive, one end of which is connected to the discharge carbon brush and the other end is connected to the ground reference plane to release the discharged charge.
2. The automatic discharge device for electrostatic discharge generator according to claim 1, characterized in that: The conductive connection structure is connected to a metal conductive connector connected to the discharge carbon brush, and the metal conductive connector is connected to a grounding cable connected to a ground reference plane.
3. The automatic discharge device for electrostatic discharge generator according to claim 2, characterized in that: The grounding cable is provided with a discharge resistor connected in series, which is used for current limiting and discharging the charge accumulated in the electrostatic discharge gun tip.
4. The automatic discharge device for electrostatic discharge generator according to claim 1, characterized in that: The first placement notch matches the size of the electrostatic discharge gun head, and the second placement notch matches the size of the electrostatic discharge gun tail, thereby achieving stable support for the electrostatic discharge gun head.
5. The automatic discharge device for electrostatic discharge generator according to claim 4, characterized in that: The front support frame and the rear support frame are made of non-metallic hard insulating material, and the first placement slot and the second placement slot respectively arranged correspondingly are covered with soft buffer insulating material, so that the electrostatic discharge gun is in soft contact with the corresponding placement slot.
6. The automatic discharge device for electrostatic discharge generator according to claim 4 or 5, characterized in that: The first placement slot and the second placement slot are both "U"-shaped slots, and the openings penetrate the upper surface of the corresponding bracket, so as to facilitate the placement of the electrostatic discharge gun.
7. The automatic discharge device for electrostatic discharge generator according to claim 2, characterized in that: It also includes a non-metallic hard insulating pad, which is placed at the bottom of the metal conductive connector, and the height of the discharge carbon brush is adjusted to fit the gun head of the static discharge gun.
8. The automatic discharge device for electrostatic discharge generator according to claim 1, characterized in that: The height of the front support frame is smaller than that of the rear support frame, so that the electrostatic discharge gun can be placed tiltedly, and the gun head of the electrostatic discharge gun can be more easily positioned close to the discharge carbon brush.
9. The automatic discharge device for electrostatic discharge generator according to claim 3, characterized in that: The discharge resistor is a high voltage resistor, which can withstand a transient voltage of at least 20 kV.
10. The automatic discharge device for electrostatic discharge generator according to claim 1, characterized in that: The DC impedance of the entire discharge path of the automatic discharge device is 930-1000 kΩ.