Signal type strong electromagnetic pulse protection device

Abstract

The utility model relates to a signal type strong electromagnetic pulse protection device, belongs to the technical field of electromagnetic pulse protection, and solves the problem that the protection performance and the signal quality as well as the size and the weight of a product cannot be balanced in the prior art. The device comprises a shell, a primary protection device, an intermediate decoupling assembly and a secondary protection device, and two ends of the shell are respectively provided with an input end used for being connected with an equipment port and an output end used for being connected with an equipment rear-end circuit. The primary protection device, the intermediate decoupling assembly and the secondary protection device are sequentially connected between the input end and the output end; the shell is internally provided with a first isolation cavity, a second isolation cavity and a third isolation cavity which are mutually independent, the primary protection device is arranged in the first isolation cavity, the intermediate decoupling assembly is arranged in the second isolation cavity, and the secondary protection device is arranged in the third isolation cavity. The technical effects of improving the protection performance of the device and preventing the signal quality from being greatly attenuated are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electromagnetic pulse protection, especially relates to a signal type strong electromagnetic pulse protection device. BACKGROUND

[0002] With the rapid development of electronic information technology, the survival ability of electronic equipment under complex electromagnetic environment needs high standard requirement, especially for the attack of strong electromagnetic pulse, the peak field intensity is extremely high, the rising edge is extremely fast, can pass through space radiation coupling and cable conduction coupling and establish big voltage, big current at electronic equipment port rapidly, and then cause serious interference and damage to electronic equipment.

[0003] The key factors affecting the protection performance index of strong electromagnetic pulse protection device mainly have two points, one is circuit design, two is the design of product structure.

[0004] The existing electromagnetic protection product, in the product structure design aspect, usually only considers the satisfaction of the circuit device in space, in the circuit design aspect, usually through increasing the number of decoupling components to improve the protection performance, but increasing the number of stages will not only cause the increase of product volume and weight, but also cause the loss of signal quality, cause the great attenuation of signal quality, the protection performance and signal quality and product volume and weight often cannot be balanced. UTILITY MODEL CONTENTS

[0005] In view of the above analysis, the utility model aims at providing a signal type strong electromagnetic pulse protection device, to solve the problem that the protection performance and signal quality and product volume and weight of the existing electromagnetic pulse protection device cannot be balanced.

[0006] The utility model provides a signal type strong electromagnetic pulse protection device, the device includes: casing, primary protection device, intermediate decoupling component and secondary protection device, the both ends of casing are provided with input end for connecting with equipment port and output end for connecting with equipment rear end circuit respectively, primary protection device, intermediate decoupling component and secondary protection device are connected between input end and output end in proper order;

[0007] The inside of the shell is provided with a first isolated chamber, a second isolated chamber and a third isolated chamber which are independent of each other, the primary protection device is arranged in the first isolated chamber, the intermediate decoupling component is arranged in the second isolated chamber, and the secondary protection device is arranged in the third isolated chamber.

[0008] Based on the further improvement of the above device, the shell is made of metal material.

[0009] Based on the further improvement of the above device, the first isolated chamber extends along the height direction of the shell, the second isolated chamber and the third isolated chamber are located on the same side of the first isolated chamber, and the second isolated chamber and the third isolated chamber are arranged along the height direction of the shell.

[0010] Based on the further improvement of the above device, the shell comprises a front end panel and a rear end box, one end of the rear end box is open along the length direction, and the other end is closed;

[0011] The inside of the rear end box is provided with a first partition plate and a second partition plate, the first partition plate separates the inside space of the rear end box into an open part and a closed part along the length direction, and the second partition plate separates the closed part into the second isolated chamber and the third isolated chamber along the height direction;

[0012] The first side of the front end panel is detachably sealedly connected with the open end of the rear end box, and the front end panel closes the open part to form the first isolated chamber.

[0013] Based on the further improvement of the above device, the first side of the front end panel is provided with an annular protrusion which is embeddedly connected in the open end of the rear end box.

[0014] Based on the further improvement of the above device, the outer periphery of the annular protrusion is provided with a groove for accommodating a sealing ring, and the open end of the rear end box and the first side of the front end panel are sealedly connected through the sealing ring.

[0015] Based on the further improvement of the above device, the intermediate decoupling component is an LC filter component.

[0016] Based on the further improvement of the above device, the LC filter component comprises a common mode inductor and two series-connected capacitors, two coils of the common mode inductor are respectively connected with two ends of the primary protection device, and the two capacitors are connected between the second ends of the two coils.

[0017] Based on the further improvement of the above device, the primary protection device is a gas discharge tube.

[0018] Based on the further improvement of the above device, the secondary protection device comprises: two transient diodes connected in series, and the two transient diodes are connected at both ends of the intermediate decoupling component.

[0019] Compared with the prior art, the utility model at least can realize following beneficial effect one:

[0020] 1、 the utility model discloses, through the setting of primary protection device, intermediate decoupling component and secondary protection device, form a multilevel protection mechanism, can gradually absorb and disperse electromagnetic pulse, thereby can effectively prevent the damage of external strong electromagnetic pulse to equipment port. Meanwhile, the protection device of each level is arranged in the independent isolation chamber respectively, is helpful to prevent the mutual coupling between different components and the coupling to the rear-end equipment device, effectively improves the protection performance of the device.

[0021] 2、 the utility model discloses, the layout of cavity is optimized and designs, and the layout of three isolation chambers in shell is compact and reasonable, is favorable to reduce the size and weight of whole device, is convenient for installation and maintenance.

[0022] 3、 the utility model discloses, the protection circuit of device is improved, adopts gas discharge tube as primary protection device, adopts LC filter component as intermediate decoupling device, adopts two transient suppression diodes as secondary protection device, not only can better optimization protection performance index, and still can not be greatly attenuated to signal quality, can satisfy the protection demand of low sensitive threshold communication electronic equipment.

[0023] Specifically, the gas discharge tube and the transient suppression diode are both nonlinear devices, which are in a high resistance state in normal state and do not affect the normal operation of the system. When a transient peak electromagnetic pulse is coupled and induced into the equipment port, the nonlinear device is short-circuited to the ground in a very short time, most of the energy is discharged to the ground, and the residual voltage is limited within a certain range. An LC filter component with wide frequency response is used to decouple and isolate the two-stage nonlinear protective devices, which can provide common-mode and differential-mode protection for the line. The LC filter component is composed of a common-mode inductor and two capacitors. The common-mode inductor has high common-mode loss and low differential-mode loss, which can effectively reduce the protection residual voltage and improve the transmission performance of the product, avoiding the attenuation of signal quality caused by increasing the intermediate decoupling stages.

[0024] 4、 the utility model discloses, the shell structure of device is improved, and the shell is divided into front end panel and rear end box, and the front end panel is detachably installed on the rear end box through embedded mode, and the electromagnetic sealing between the two is ensured through the sealing ring, which is convenient for installation and maintenance.

[0025] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages will become apparent from the description or be learned by practicing this invention. The objectives and other advantages of this invention can be realized and obtained through the details specifically pointed out in the text and accompanying drawings. Attached Figure Description

[0026] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0027] Figure 1 This is a schematic diagram of the signal-type strong electromagnetic pulse protection device in this embodiment;

[0028] Figure 2 This is a schematic diagram of the front panel of the signal-type strong electromagnetic pulse protection device in this embodiment;

[0029] Figure 3 This is a schematic diagram of the rear casing of the signal-type strong electromagnetic pulse protection device in this embodiment;

[0030] Figure 4 This is a schematic diagram of the housing structure and cavity layout of the signal-type strong electromagnetic pulse protection device in this embodiment;

[0031] Figure 5 This is a schematic diagram of the circuit structure of the signal-type strong electromagnetic pulse protection device in this embodiment.

[0032] Figure label:

[0033] 1-Primary protection device; 2-Intermediate decoupling component; 3-Secondary protection device;

[0034] 4-Front end panel; 41-Annular protrusion; 5-Rear end housing;

[0035] 6-First isolation chamber; 7-Second isolation chamber; 8-Third isolation chamber; 9-Sealing ring. Detailed Implementation

[0036] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0037] A specific embodiment of this utility model discloses a signal-type strong electromagnetic pulse protection device, such as... Figures 1-5The device comprises a housing, a primary protection device 1, an intermediate decoupling component 2 and a secondary protection device 3, two ends of the housing are respectively provided with an input end for connecting with a device port and an output end for connecting with a device rear-end circuit, the primary protection device 1, the intermediate decoupling component 2 and the secondary protection device 3 are sequentially connected between the input end and the output end.

[0038] The inside of the housing is provided with a first isolation chamber 6, a second isolation chamber 7 and a third isolation chamber 8 which are independent of each other, the primary protection device 1 is arranged in the first isolation chamber 6, the intermediate decoupling component 2 is arranged in the second isolation chamber 7, and the secondary protection device 3 is arranged in the third isolation chamber 8.

[0039] In implementation, the primary protection device 1, the intermediate decoupling component 2 and the secondary protection device 3 are all grounded to discharge energy to the ground. The housing is used to arrange the isolation chambers to respectively electromagnetically isolate the protection devices of each level of the device, therefore, the housing can be made of electromagnetic isolation material, or the electromagnetic isolation effect can be realized by coating electromagnetic isolation material on the inner walls of the three isolation chambers.

[0040] Compared with the prior art, in the embodiment, a multi-level protection mechanism is formed by the arrangement of the primary protection device 1, the intermediate decoupling component 2 and the secondary protection device 3, which can gradually absorb and disperse electromagnetic pulses, thereby effectively preventing damage of external strong electromagnetic pulses to the device port. Meanwhile, the protection devices of each level are arranged in independent isolation chambers, which helps to prevent mutual coupling between different components and coupling to the rear-end device components, and effectively improves the protection performance of the device.

[0041] Specifically, the housing is made of metal material, for example, copper. The metal material is a commonly used electromagnetic isolation material, and the housing made of metal material can well realize electromagnetic isolation, and the primary protection device 1, the intermediate decoupling component 2 and the secondary protection device 3 can be respectively grounded through the housing to discharge energy to the ground.

[0042] Preferably, the first isolation chamber extends along the height direction of the housing, the second isolation chamber and the third isolation chamber are both located on the same side of the first isolation chamber, and the second isolation chamber and the third isolation chamber are arranged along the height direction of the housing.

[0043] Compared with the prior art, in the embodiment, the cavity layout is optimized and designed, and the layout of the three isolation chambers in the housing is compact and reasonable, which is conducive to reducing the volume and weight of the entire device and facilitating installation and maintenance.

[0044] In one embodiment, as shown in Figures 1-4As shown, the housing includes a front panel 4 and a rear box 5. The rear box 5 is open at one end along its length and closed at the other end. The rear box 5 has a first partition and a second partition inside. The first partition divides the internal space of the rear box 5 into an open portion and a closed portion along its length, and the second partition divides the closed portion into a second isolation cavity 7 and a third isolation cavity 8 along its height. The first side of the front panel 4 is detachably and sealingly connected to the open end of the rear box 5, and the front panel 4 closes the open portion to form the first isolation cavity 6.

[0045] Specifically, the rear housing 5, the first partition, and the second partition are integrally formed, which helps to ensure the electromagnetic sealing of each of the three isolation chambers.

[0046] Specifically, a first through hole is provided on the cavity wall (i.e., the lower half of the first partition) between the first isolation cavity and the second isolation cavity. The connecting wire of the primary protection device 1 and the intermediate decoupling component 2 passes through the first through hole, and a sealing ring 9, such as a rubber ring, is provided in the first through hole to seal the gap between the hole wall of the first through hole and the connecting wire.

[0047] Similarly, a second through hole is provided on the cavity wall (i.e., the second partition) between the second isolation cavity and the third isolation cavity. The connecting wire of the intermediate decoupling component 2 and the secondary protection device 3 passes through the second through hole, and a sealing ring 9, such as a rubber ring, is provided in the second through hole to seal the gap between the hole wall of the second through hole and the connecting wire.

[0048] Specifically, such as Figure 2 As shown, the front panel 4 has an annular protrusion 41 on its first side, and the annular protrusion 41 is embedded in the opening of the rear housing 5.

[0049] More specifically, the outer periphery of the annular protrusion 41 is provided with a groove for accommodating the sealing ring 9, and the opening end of the rear end housing 5 is sealed to the first side of the front end panel 4 through the sealing ring 9.

[0050] In this embodiment, the housing structure of the device has been improved, and the housing is divided into a front panel 4 and a rear box 5. The front panel 4 is installed on the rear box 5 by means of embedding or other detachable means, and the electromagnetic sealing between the two is ensured by the sealing ring 9, which facilitates installation and maintenance.

[0051] Specifically, the sealing ring 9 is a rubber ring.

[0052] Preferably, the front panel 4 is grounded, the primary protection device 1 is provided with a grounding pin, the primary protection device 1 is arranged on the front panel 4, and the grounding pin of the primary protection device 1 is connected with the front panel 4.

[0053] In one embodiment, as shown in Figure 5 The primary protection device 1 is a gas discharge tube, the intermediate decoupling component 2 is an LC filter component, and the secondary protection device 3 comprises two transient diodes connected in series and connected between two ends of the intermediate decoupling component 2.

[0054] Compared with the prior art, in the embodiment, the protection circuit of the device is improved, the gas discharge tube is used as the primary protection device 1, the LC filter component is used as the intermediate decoupling device, and the two transient suppression diodes are used as the secondary protection device 3, so that the protection performance index can be better optimized, the signal quality is not greatly attenuated, and the protection requirement of the low-sensitivity-threshold communication electronic equipment can be met.

[0055] Specifically, the gas discharge tube and the transient suppression diode are both nonlinear devices, which are in a high-resistance state in a normal state and do not affect the normal work of the system, when the transient peak electromagnetic pulse is coupled and inducted into the device port, the nonlinear device is short-circuited to the ground in a very short time, most of the energy is discharged to the ground, and the residual voltage is limited in a certain range, the LC filter component with a wide frequency response is used to decouple and isolate the two-stage nonlinear protective devices, and the line can be protected from common mode and differential mode.

[0056] Further specifically, the LC filter component comprises a common-mode inductor and two series-connected capacitors, two coil first ends of the common-mode inductor are connected with two ends of the primary protection device 1, and two capacitors are connected between two coil second ends.

[0057] The LC filter component is composed of the common-mode inductor and the two capacitors, the common-mode inductor has high common-mode loss and small differential-mode loss, and can effectively reduce the protection residual voltage and improve the transmission performance of the product.

[0058] It should be noted that the gas discharge tube is directly grounded, the connection point between the two capacitors of the LC filter component is grounded, and the connection point between the two transient diodes is grounded.

[0059] It is worth noting that the LC filter component in the utility model is a first-stage LC filter component, that is, a single filter unit composed of a group of inductors and capacitors, so that the volume and weight of the LC filter component are small, meanwhile, the common-mode inductor is used in the LC filter component, and the common-mode inductor can suppress common-mode noise and other characteristics, so that the signal quality is ensured from being greatly attenuated while the protection performance is improved.

[0060] Specifically, a magnetic core material with high magnetic permeability and strong electromagnetic pulse resistance is selected to make a magnetic ring, and a twisted pair is wound on the magnetic ring to form a common mode inductor.

[0061] In implementation, the gas discharge tube is arranged in the first isolation cavity 6, and the first isolation cavity 6 is used to shield and isolate the radiation interference from the outside and the wideband interference generated by the gas discharge tube under the transient pulse, thereby reducing the influence on the rear-end circuit; in order to ensure that the discharge current of the gas discharge tube is coupled to the rear-end shell as small as possible, the ground pin of the gas discharge tube is usually designed on the front-end mounting panel, and the discharge current is discharged to the large-area ground shell as much as possible. The LC filter assembly is arranged in the second isolation cavity 7, and the second isolation cavity 7 can simultaneously isolate the interference generated by the front-end and rear-end nonlinear devices. The two transient diodes are arranged in the third isolation cavity 8, and the third isolation cavity 8 can isolate the nonlinear interference generated by the transient suppression diode.

[0062] The utility model provides a kind of signal class strong electromagnetic pulse protection device, when using, the key device of protection device is connected in parallel in system working loop, normal state, it is high resistance state, in communication loop only play equipment cable switching function;When there is transient pulse attack, it can respond quickly, high resistance is converted into low pass, and the large voltage, large current coupled by equipment front end is discharged and suppressed in lower range, effectively protect rear-end equipment.

[0063] The signal class strong electromagnetic pulse protection device of the utility model, by to circuit design aspect, adopt the LC wideband filter assembly of common mode rejection ratio as intermediate decoupling component 2, in product structure design aspect, the cavity structure of shell is optimized design, so not only can improve the protection performance and communication performance index of electromagnetic pulse protection device, but also can optimize volume and weight, satisfy the characteristics of modernization protection device " miniaturization, light weight, index optimization ".

[0064] The above is only the preferred specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. A signal class high power electromagnetic pulse protection device, characterized in that, The device comprises a housing, a primary protection device, an intermediate decoupling component and a secondary protection device, two ends of the housing are respectively provided with an input end for connecting with a device port and an output end for connecting with a device rear-end circuit, the primary protection device, the intermediate decoupling component and the secondary protection device are connected in sequence between the input end and the output end. The inside of the housing is provided with a first isolation chamber, a second isolation chamber and a third isolation chamber which are independent of each other, the primary protection device is arranged in the first isolation chamber, the intermediate decoupling component is arranged in the second isolation chamber, and the secondary protection device is arranged in the third isolation chamber.

2. The apparatus of claim 1, wherein, The housing is made of metal material.

3. The apparatus of claim 1 or 2, wherein, The first isolation chamber extends along the height direction of the housing, the second isolation chamber and the third isolation chamber are located on the same side of the first isolation chamber, and the second isolation chamber and the third isolation chamber are arranged along the height direction of the housing.

4. The apparatus of claim 3, wherein, The housing comprises a front end panel and a rear end box body, one end of the rear end box body is open along the length direction, and the other end is closed. The inside of the rear end box body is provided with a first partition plate and a second partition plate, the first partition plate divides the inside space of the rear end box body into an open part and a closed part along the length direction, and the second partition plate divides the closed part into the second isolation chamber and the third isolation chamber along the height direction. The first side of the front end panel is detachably and sealingly connected with the open end of the rear end box body, and the front end panel closes the open part to form the first isolation chamber.

5. The apparatus of claim 4, wherein, The first side of the front end panel is provided with a ring-shaped protrusion which is embeddedly connected in the open end of the rear end box body.

6. The apparatus of claim 5, wherein, The outer periphery of the ring-shaped protrusion is provided with a groove for accommodating a sealing ring, and the open end of the rear end box body and the first side of the front end panel are sealingly connected through the sealing ring.

7. The apparatus of claim 1 or 2, wherein, The intermediate decoupling component is an LC filter component.

8. The apparatus of claim 7, wherein, The LC filter component comprises a common-mode inductor and two series-connected capacitors, two coil first ends of the common-mode inductor are respectively connected with two ends of the primary protection device, and two capacitors are connected between two second ends of the coils.

9. The apparatus of claim 1 or 2, wherein, The primary protection device is a gas discharge tube.

10. The apparatus of claim 1 or 2, wherein, The secondary protection device comprises two series-connected transient diodes, and the two transient diodes are connected at two ends of the intermediate decoupling component.

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