CN113438034B - Filtering type strong transient electromagnetic pulse protection structure - Google Patents
Filtering type strong transient electromagnetic pulse protection structure Download PDFInfo
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- CN113438034B CN113438034B CN202110663354.4A CN202110663354A CN113438034B CN 113438034 B CN113438034 B CN 113438034B CN 202110663354 A CN202110663354 A CN 202110663354A CN 113438034 B CN113438034 B CN 113438034B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B15/00—Suppression or limitation of noise or interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
- H05K9/0015—Gaskets or seals
Abstract
The invention discloses a filtering type strong transient electromagnetic pulse protection structure, and relates to the technical field of strong electromagnetic pulse protection. The technical key points comprise that: the device comprises a metal shielding box body, a radio frequency filter circuit assembly, a primary high pulse energy absorption module, a secondary high pulse energy absorption module and a fine pulse energy absorption module; a metal inner cavity is arranged in the metal shielding box body, and the metal shielding box body is provided with a radio frequency input end and a radio frequency output end which are communicated with the metal inner cavity; the radio frequency filter circuit assembly is arranged in the metal inner cavity and is electrically connected between the radio frequency input end and the radio frequency output end; the primary high pulse energy absorption module, the secondary high pulse energy absorption module and the fine pulse energy absorption module are electrically connected between the radio frequency filter circuit assembly and the inner wall of the metal shielding box body along the radio frequency input end to the radio frequency output end in sequence.
Description
Technical Field
The invention relates to the technical field of strong electromagnetic pulse protection, in particular to a filtering type strong transient electromagnetic pulse protection structure.
Background
With the popularization and application of the 5G communication technology and the rapid development of the radio frequency microwave technology to higher frequencies, users of wireless equipment are increasing day by day, various wireless equipment and facilities are widely applied to the engineering application fields of industrial and agricultural production, scientific research, foreign air detection, national defense construction, national and local security defense and the like, and the transceiving systems of various wireless equipment and facilities are placed in a complex electromagnetic environment.
The wireless transceiving system equipment, particularly the antenna and the coaxial feeder line are exposed outside the equipment, so that the equipment is very easy to be invaded by various strong transient electromagnetic pulses, and the various transient strong electromagnetic pulses are introduced into the transceiving system through the antenna and the feeder line to cause the damage of key sensitive radio frequency front-end equipment, thereby influencing the normal work of the wireless transceiving system.
In the strong transient electromagnetic pulse protection, microsecond-level (us) slow leading edge (hereinafter referred to as "slow edge") strong electromagnetic pulse (such as lightning electromagnetic pulse) narrow-band radio frequency link protection technology is relatively mature, and for other types of nanosecond-level (ns) and below fast leading edge (hereinafter referred to as "fast edge") strong electromagnetic pulse protection technology is still in a starting stage, the fast edge and slow edge protection are usually independent functional modules to cause inconvenience in application, the fast edge protection module cannot bear the energy of the slow edge strong pulse, and the slow edge module has very low response speed and cannot timely inhibit the fast edge strong electromagnetic pulse; meanwhile, the special protection module is additionally arranged at the radio frequency front end, so that the performance index of the system is sacrificed to a certain extent, and the complexity of the radio frequency front end is increased. How to implant an effective strong electromagnetic pulse protection structure to the prefilter of the radio frequency front end, not only save the cost of the apparatus effectively but also promote the electromagnetic pulse protection performance of the apparatus itself, it is a technical problem that needs to be solved urgently and the actual engineering application demand that needs to be satisfied urgently when the strong transient electromagnetic pulse protection of the radio frequency front end.
Disclosure of Invention
This application provides a strong transient state electromagnetic pulse protective structure of filtering type in order to save the cost of equipment and promote the electromagnetic pulse protective properties of equipment self again.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a strong transient state electromagnetic pulse protective structure of filtering type which characterized in that: the method comprises the following steps: the device comprises a metal shielding box body, a radio frequency filter circuit assembly, a primary high pulse energy absorption module, a secondary high pulse energy absorption module and a fine pulse energy absorption module;
a metal inner cavity is formed in the metal shielding box body, and the metal shielding box body is provided with a radio frequency input end and a radio frequency output end which are communicated with the metal inner cavity;
the radio frequency filter circuit assembly is arranged in the metal inner cavity and is electrically connected between the radio frequency input end and the radio frequency output end, and the radio frequency filter circuit assembly at least comprises 5 sections of LC resonance filter circuits;
the primary high pulse energy absorption module, the secondary high pulse energy absorption module and the fine pulse energy absorption module are electrically connected between the radio frequency filter circuit assembly and the inner wall of the metal shielding box body in sequence from the radio frequency input end to the radio frequency output end;
the LC resonance filter circuit of the radio frequency filter circuit component between the primary high pulse energy absorption module and the secondary high pulse energy absorption module forms a primary filter network, the LC resonance filter circuit of the radio frequency filter circuit component between the secondary high pulse energy absorption module and the fine pulse energy absorption module forms a secondary filter network, and the LC resonance filter circuit of the radio frequency filter circuit component between the fine pulse energy absorption module and the radio frequency output end forms a final filter network.
By adopting the technical scheme, the radio frequency filter circuit assembly, the primary high pulse energy absorption module, the secondary high pulse energy absorption module and the fine pulse energy absorption module are adopted in the application. Although the response speed of the primary high-pulse energy absorption module is lower than that of the other two high-pulse energy absorption modules, the primary high-pulse energy absorption module can absorb about 60% of energy in strong transient pulses. The secondary primary high-pulse energy absorption module has a medium response speed and can absorb about 25% of energy in a strong transient pulse. The fine-level pulse energy absorption module has the fastest response speed and can absorb about 10% of energy in strong transient pulses.
The LC resonance filter circuit in the radio frequency filter circuit component is divided into three stages of filter networks for carrying out three stages of high-frequency filtering. The LC resonance filter circuit connected in series in the radio frequency filter circuit component has a time delay effect on the front edge of the fast edge pulse, so that the steepness elongation time parameter of the front edge of the fast edge pulse can be reduced, the fast edge pulse is changed into the slow edge pulse, and strong electromagnetic pulse energy release and absorption can be realized by using a slow edge device such as a transient voltage suppressor diode in the fine-level pulse energy absorption module. And finally, a large amount of energy in strong transient pulses can be absorbed through the step-by-step absorption of the three-stage high-pulse energy absorption module, meanwhile, due to the step-by-step increase of the response speed, the residual energy is in the range which can be borne by back-end equipment, the residual voltage is restrained to the minimum level, and the response speed of the whole structure is in a nanosecond level. The problem of import dependence of a fast-edge strong electromagnetic pulse protection device is solved.
The invention is further configured to: the primary high pulse energy absorption module, the secondary high pulse energy absorption module and the fine pulse energy absorption module are one of a gas discharge tube, a transient voltage suppression diode or a semiconductor PIN diode.
By adopting the technical scheme, the primary high pulse energy absorption module, the secondary high pulse energy absorption module and the fine pulse energy are detachably arranged between the metal shielding shell by adopting the gas discharge tube, the transient voltage suppression diode or the semiconductor PIN diode, so that the integral primary high pulse energy absorption module, the secondary high pulse energy absorption module and the fine pulse energy can be quickly reconstructed according to actual requirements, and a good adaptive effect is achieved.
The invention is further configured to: the primary high pulse energy absorption module is a transient voltage suppression diode, and the secondary high pulse energy absorption module and the fine pulse energy absorption module are semiconductor PIN diodes.
By adopting the technical scheme, the transient voltage suppression diode can have higher response speed to the slow edge, and the semiconductor PIN diode has higher response speed to the fast edge, so that three-level fast and slow edge comprehensive protection with fast response is formed by setting.
The invention is further configured to: the primary high-pulse energy absorption module is a gas discharge tube or a transient voltage suppression diode, the secondary high-pulse energy absorption module is a transient voltage suppression diode, and the fine-pulse energy absorption module is a semiconductor PIN diode.
By adopting the technical scheme, compared with a transient voltage suppression diode, the gas discharge tube has a slow response speed and can absorb more energy; therefore, three-level fast and slow edge comprehensive protection with high energy absorption is formed by arrangement.
The invention is further configured to: the radio frequency filter circuit assembly comprises a substrate, and an LC parallel resonance circuit and an LC series resonance circuit which are arranged on the substrate, wherein the middle part of the radio frequency filter circuit assembly is the LC parallel resonance circuit, and the radio frequency filter circuit assembly is a filter network symmetrically arranged by the middle LC parallel resonance circuit.
By adopting the technical scheme, the center frequency and the basic bandwidth of the radio frequency filter circuit component are determined by the L and the C which are connected in parallel at the center, the out-of-band rejection is improved by the network formed by connecting the L and the C in series and parallel, and the left-right symmetrical LC series-parallel T-shaped network is used for improving the out-of-band rejection ratio.
The invention is further configured to: the number of LC resonance filter circuits in the radio frequency filter circuit component is 7, 9 or 11 sections, and the number of LC parallel resonance circuits is at least 3 sections.
By adopting the technical scheme, the more the number of the sections of the LC resonance filter circuit in the radio frequency filter circuit component is, the better the filter delay effect is, but the higher the cost is, so that the cost and the filter delay effect can be kept by 7, 9 or 11 sections. Wherein, at least 3 sections of LC parallel resonance circuits can play a better filtering time-delay effect.
The invention is further configured to: the first-stage filter network, the second-stage filter network and the final-stage filter network at least comprise one section of LC parallel resonance circuit.
By adopting the technical scheme, the first-stage filter network, the second-stage filter network and the final-stage filter network comprise the LC parallel resonance circuit, so that a good filtering delay effect can be kept.
The invention is further configured to: the radio frequency filter circuit assembly comprises 7 sections of LC resonance filter circuits, namely a first-stage LC series resonance circuit, a second-stage LC series resonance circuit, a third-stage LC series resonance circuit, a fourth-stage LC series resonance circuit, a first-stage LC parallel resonance circuit, a second-stage LC parallel resonance circuit and a third-stage LC parallel resonance circuit, wherein the first-stage LC series resonance circuit, the second-stage LC series resonance circuit, the third-stage LC series resonance circuit and the fourth-stage LC series resonance circuit are connected in series between a radio frequency input end and a radio frequency output end, the first-stage LC parallel resonance circuit is connected between the first-stage LC series resonance circuit and the second-stage LC series resonance circuit, the second-stage LC parallel resonance circuit is connected between the second-stage LC series resonance circuit and the third-stage LC parallel resonance circuit, and the third-stage LC parallel resonance circuit is connected between the third-stage LC series resonance circuit and the fourth-stage LC series resonance circuit.
The invention is further configured to: the secondary high-pulse energy absorption module is connected between the primary LC parallel resonance circuit and the secondary LC series resonance circuit, and the fine-pulse energy absorption module is connected between the tertiary LC series resonance circuit and the tertiary LC parallel resonance circuit.
Compared with the prior art, the invention has the beneficial effects that:
(1) the integrated design of the metal shielding box body ensures that the device has compact structure, good sealing performance and good shielding performance, is simple and convenient, and can be flexibly and reliably installed and grounded in various radio frequency devices;
(2) the nodes of the LC parallel resonance circuit in the radio frequency filter circuit component are connected in parallel and are pulled down to the metal shielding box body of the ground, so that the connection is convenient, and radio frequency performance parameters are not influenced;
(3) the strong electromagnetic pulse energy can be released and absorbed by using a slow-edge device such as a transient voltage suppressor diode, so that the fast-edge strong electromagnetic pulse can be suppressed by using the slow-edge strong electromagnetic pulse suppressor device, and the problem of import dependence of a fast-edge strong electromagnetic pulse protection device is solved.
Drawings
FIG. 1 is a schematic sectional view of the structure of the present embodiment;
FIG. 2 is a block diagram of the present embodiment;
fig. 3 is a schematic circuit diagram of the present embodiment.
Reference numerals: 1. a metal shielding case; 11. a metal inner cavity; 12. a radio frequency input; 13. a radio frequency output terminal; 14. a metal body; 15. a metal cover plate; 16. a waterproof conductive rubber ring; 2. a radio frequency filter circuit assembly; 20. a substrate; 21. a first-stage filter network; 22. a secondary filter network; 23. a final filter network; 24. an LC parallel resonance circuit; 25. an LC series resonant circuit; 31. a primary high pulse energy absorption module; 32. a secondary high pulse energy absorption module; 33. a fine-scale pulse energy absorption module.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
In the strong transient electromagnetic pulse protection, microsecond-level (us) slow leading edge (hereinafter referred to as "slow edge") strong electromagnetic pulse (such as lightning electromagnetic pulse) narrow-band radio frequency link protection technology is relatively mature, and for other types of nanosecond-level (ns) and below fast leading edge (hereinafter referred to as "fast edge") strong electromagnetic pulse protection technology is still in a starting stage, the fast edge and slow edge protection are usually independent functional modules to cause inconvenience in application, the fast edge protection module cannot bear the energy of the slow edge strong pulse, and the slow edge module has very low response speed and cannot timely inhibit the fast edge strong electromagnetic pulse; meanwhile, the special protection module is additionally arranged at the radio frequency front end, so that the performance index of the system is sacrificed to a certain extent, and the complexity of the radio frequency front end is increased. How to implant an effective strong electromagnetic pulse protection structure to the prefilter of the radio frequency front end, not only save the cost of the apparatus effectively but also promote the electromagnetic pulse protection performance of the apparatus itself, it is a technical problem that needs to be solved urgently and the actual engineering application demand that needs to be satisfied urgently when the strong transient electromagnetic pulse protection of the radio frequency front end.
The rf front end strong electromagnetic pulse protection device needs to ensure effective transmission of useful rf signals without any influence on system functions, in addition to effectively suppressing strong electromagnetic pulses. Such devices require unique strong electromagnetic pulse protection techniques and radio frequency signal transmission techniques. The strong electromagnetic pulse suppression device has good radio frequency characteristic parameters while having pulse suppression performance, and various strong electromagnetic pulse protection function modules also need to have compatibility and reconfigurability. The fast edge pulse protection device and module for protecting the strong radio frequency electromagnetic pulse basically depend on import, and particularly the high-power fast edge pulse protection device used on some special wireless equipment has high requirement on the reliability, and the fast edge protection device is the key.
The application discloses strong transient state electromagnetic pulse protective structure of filtering type, as shown in fig. 1, include: the device comprises a metal shielding box body 1, a radio frequency filter circuit component 2, a primary high pulse energy absorption module 31, a secondary high pulse energy absorption module 32 and a fine pulse energy absorption module 33.
As shown in fig. 1 and 2, a metal inner cavity 11 is arranged in the metal shielding box body 1, and the metal shielding box body 1 is provided with a radio frequency input end 12 and a radio frequency output end 13 communicated to the inside of the metal inner cavity 11; the radio frequency filter circuit assembly 2 is arranged in the metal inner cavity 11 and is electrically connected between a radio frequency input end 12 and a radio frequency output end 13, and the radio frequency filter circuit assembly 2 comprises a plurality of sections of LC resonance filter circuits; the primary high pulse energy absorption module 31, the secondary high pulse energy absorption module 32 and the fine pulse energy absorption module 33 are electrically connected between the radio frequency filter circuit assembly 2 and the inner wall of the metal shielding box body 1 along the radio frequency input end 12 to the radio frequency output end 13 in sequence; the LC resonance filter circuit of the rf filter circuit assembly 2 between the primary high pulse energy absorption module 31 and the secondary high pulse energy absorption module 32 forms a primary filter network 21, the LC resonance filter circuit of the rf filter circuit assembly 2 between the secondary high pulse energy absorption module 32 and the fine pulse energy absorption module 33 forms a secondary filter network 22, and the LC resonance filter circuit of the rf filter circuit assembly 2 between the fine pulse energy absorption module 33 and the rf output terminal 13 forms a final filter network 23.
The primary high pulse energy absorbing module 31 is slower in response speed than the other two high pulse energy absorbing modules but can absorb about 60% of the energy in the strong transient pulse. The secondary primary high pulse energy absorption module 31 has a medium response speed and can absorb about 25% of the energy in a strong transient pulse. The fine-level pulse energy absorption module 33 has the fastest response speed and can absorb about 10% of energy in strong transient pulses.
The LC resonant filter circuit in the rf filter circuit module 2 is divided into three stages of filter networks for three-stage high frequency filtering. The LC resonant filter circuit connected in series in the rf filter circuit assembly 2 delays the leading edge of the fast edge pulse, so as to reduce the steepness extension time parameter of the leading edge of the fast edge pulse, and change the fast edge pulse into a slow edge pulse, so that the fine-level pulse energy absorption module 33 can discharge and absorb the strong electromagnetic pulse energy using a slow edge device such as a transient voltage suppressor. And finally, a large amount of energy in strong transient pulses can be absorbed through the step-by-step absorption of the three-stage high-pulse energy absorption module, and meanwhile, because the response speed is increased step by step, the residual energy is in the range which can be borne by back-end equipment and the residual voltage is suppressed to the minimum level, and the response speed of the whole structure is in a nanosecond level.
The invention starts from a filter network and devices, takes a process of manufacturing radio frequency distribution parameters as a breakthrough, fully utilizes a radio frequency distribution parameter equivalent circuit, implants a strong electromagnetic pulse device on a filter radio frequency circuit board assembly module, realizes the function of strong electromagnetic pulse protection on the premise of not influencing the radio frequency performance of a filter, and simultaneously fully utilizes the time delay characteristic of the filter device to change the waveform characteristic of strong electromagnetic pulse so as to realize the suppression of fast-edge strong electromagnetic pulse by using a device with slow response speed, solve the problem of insufficient response speed and energy tolerance of domestic fast-edge strong electromagnetic pulse, solve the problem of comprehensive protection of fast edge and slow edge at the front end of radio frequency by using an electromagnetic pulse suppression device with good radio frequency parameters according to the matching of the magnitude of absorption energy and the response speed, and have reconfigurability and convenient use; the method can solve the practical problem of the engineering application that the strong electromagnetic pulse protection of the radio frequency pre-filter is insufficient, thereby comprehensively solving the technical short board problem which restricts the industry development.
Specifically, as shown in fig. 1, the metal shielding box 1 is of a fully sealed metal structure. The fully-sealed metal structure can improve the electromagnetic shielding performance and the grounding performance of the protection device. The metal shielding box body 1 and the metal inner cavity 11 inside the metal shielding box body are both square on the whole. The metal shielding box 1 includes a metal body 14 having an opening on one side end face and a metal cover plate 15 detachably covering the opening of the metal body 14. The bandwidth is adjusted by detaching the metal cover plate 15 and adjusting the parameters in the radio frequency filter circuit assembly 2 in the metal inner cavity 11.
The metal body 14 is an integrally formed structure, and an annular waterproof groove is formed in the outer wall of the end face of one side, facing the metal cover plate 15, of the metal body 14. A waterproof conductive rubber ring 16 is arranged in the waterproof groove. Because the waterproof conductive rubber ring 16 has elasticity, when the metal cover plate 15 covers the opening of the metal body 14, the waterproof conductive rubber ring 16 can deform, and the gap between the metal cover plate 15 and the metal body 14 is sealed.
The radio frequency input end 12 and the radio frequency output end 13 are internally provided with 50 ohm signal transmission lines which can be connected with a 50 ohm radio frequency link outside the metal body 14. The rf input end 12 and the rf output end 13 are fixed on two opposite side walls of the metal body 14, so that the signal transmission lines in the rf input end 12 and the rf output end 13 are coaxial. The radio frequency input end 12 and the radio frequency output end 13 and the metal body 14 can be fixed integrally, fixed by a flange plate, fixed by tight-fit compression joint or fixed by threads.
As shown in fig. 1, the rf filter circuit assembly 2 further includes a substrate 20, and the plurality of LC resonant filter circuits are disposed on the substrate 20. Wherein the number of LC resonance filter circuits is at least five. Preferably, the number of LC resonant filter circuits in the rf filter circuit assembly 2 is 7, 9 or 11 sections. .
As shown in fig. 1, the LC resonance filter circuit includes an LC parallel resonance circuit 24 and an LC series resonance circuit 25 in type. The LC series resonant circuit 25 includes a series resonant inductor L and a series resonant capacitor C connected in series between the rf input terminal 12 and the rf output terminal 13. And the LC parallel resonant circuit 24 includes a parallel resonant inductor L and a parallel resonant capacitor C, one end of which is electrically connected to a node of the series path between the radio frequency input terminal 12 and the radio frequency output terminal 13 and the other end of which is grounded. The parallel resonance inductor L and the parallel resonance capacitor C are grounded through the metal shielding box body 1 connected to the ground in a pull-down mode, the whole connection is convenient, and radio frequency performance parameters are not affected.
Further, as shown in fig. 1 and fig. 3, in the present embodiment, the middle portion of the rf filter circuit assembly 2 is an LC parallel resonant circuit 24, and the rf filter circuit assembly 2 is a filter network whose middle portion is symmetrically arranged with the LC parallel resonant circuit 24. The center frequency and the basic bandwidth of the radio frequency filter circuit component 2 are determined by a parallel resonance inductor L and a parallel resonance capacitor C which are connected in parallel at the center, the out-of-band rejection is improved by a network formed by connecting the inductor L and the capacitor C in series and parallel, and the out-of-band rejection ratio is improved by a bilaterally symmetrical LC series-parallel T-shaped network. The number of LC parallel resonant circuits 24 in the radio frequency filter circuit assembly 2 is at least 3 sections.
In the present embodiment, as shown in fig. 1 and 3, the rf filter circuit assembly 2 includes 7 LC resonant filter circuits, which are a primary LC series resonant circuit, a secondary LC series resonant circuit, a tertiary LC series resonant circuit, and a quaternary LC series resonant circuit connected in series between the rf input terminal 12 and the rf output terminal 13, a primary LC parallel resonant circuit connected between the primary LC series resonant circuit and the secondary LC series resonant circuit, a secondary LC parallel resonant circuit connected between the secondary LC series resonant circuit and the tertiary LC series resonant circuit, and a tertiary LC parallel resonant circuit connected between the tertiary LC series resonant circuit and the quaternary LC series resonant circuit, respectively.
As shown in fig. 1 and 3, the secondary high pulse energy absorbing module 32 is connected between the primary LC parallel resonant circuit and the secondary LC series resonant circuit, and the fine pulse energy absorbing module 33 is connected between the tertiary LC series resonant circuit and the tertiary LC parallel resonant circuit.
Therefore, the primary LC series resonant circuit and the primary LC parallel resonant circuit form a primary filter network 21, the secondary LC series resonant circuit, the secondary LC parallel resonant circuit and the tertiary LC series resonant circuit form a secondary filter network 22, and the tertiary LC parallel resonant circuit and the quaternary LC series resonant circuit form a final filter network 23. The first-stage filter network 21, the second-stage filter network 22 and the final-stage filter network 23 each include a section of LC parallel resonant circuit 24. To maintain a good filtering delay effect.
Specifically, as shown in fig. 3, the primary high pulse energy absorption module 31, the secondary high pulse energy absorption module 32 and the fine pulse energy absorption module 33 are one of a gas discharge tube, a transient voltage suppression diode or a semiconductor PIN diode, which can be detachably mounted between the substrate 20 and the metal shielding case. The integral primary high pulse energy absorption module 31, the secondary high pulse energy absorption module 32 and the fine pulse energy can be quickly reconstructed according to actual requirements, so that a good adaptive effect is achieved.
In one embodiment, the primary high pulse energy absorption module 31 is a transient voltage suppressor diode, and the secondary high pulse energy absorption module 32 and the fine pulse energy absorption module 33 are semiconductor PIN diodes.
In another embodiment, the primary high pulse energy absorbing module 31 is a gas discharge tube, the secondary high pulse energy absorbing module 32 is a tvs diode, and the fine pulse energy absorbing module 33 is a semiconductor PIN diode.
In another embodiment, the primary high pulse energy absorbing module 31 is a tvs diode, the secondary high pulse energy absorbing module 32 is a tvs diode, and the fine pulse energy absorbing module 33 is a semiconductor PIN diode.
The device can provide filtering type strong electromagnetic pulse protection for the radio frequency front-end equipment in extremely complex and severe electromagnetic environments; a strong electromagnetic pulse protection suppression device is implanted into the radio frequency filter, so that the circuit is simplified, the cost is saved, and the requirements of engineering application practice are met. The invention utilizes the radio frequency filtering component to complete the signal filtering function, utilizes the implanted strong transient electromagnetic pulse suppression devices such as a gas discharge tube, a transient suppression diode and a semiconductor PIN diode (including a tube stack) to realize the strong electromagnetic pulse integrated protection, has the reconfigurable function and is convenient for field application. The device has engineering practical conditions, and samples meet related technical conditions after being tested and obtain good protection effect.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (7)
1. A strong transient electromagnetic pulse protective structure of filtering type, characterized by that includes: the device comprises a metal shielding box body (1), a radio frequency filter circuit component (2), a primary high pulse energy absorption module (31), a secondary high pulse energy absorption module (32) and a fine pulse energy absorption module (33);
a metal inner cavity (11) is formed in the metal shielding box body (1), and a radio frequency input end (12) and a radio frequency output end (13) which are communicated with the metal inner cavity (11) are arranged on the metal shielding box body (1); the metal shielding box body (1) and the metal inner cavity (11) in the metal shielding box body are both square integrally; the metal shielding box body (1) comprises a metal body (14) with an opening on one side end face and a metal cover plate (15) detachably covered at the opening of the metal body (14); adjusting parameters in the radio frequency filter circuit assembly (2) in the metal inner cavity (11) by detaching the metal cover plate (15) to adjust the bandwidth;
the radio frequency filter circuit assembly (2) comprises a substrate (20), a plurality of sections of LC parallel resonance circuits (24) arranged below the substrate (20) and a plurality of sections of LC series resonance circuits (25) arranged on the substrate (20), wherein the middle part of the radio frequency filter circuit assembly (2) is provided with one section of LC parallel resonance circuit (24), and the radio frequency filter circuit assembly (2) is a filter network symmetrically arranged by the one section of LC parallel resonance circuit (24);
the radio frequency filter circuit component (2) is electrically connected between the radio frequency input end (12) and the radio frequency output end (13), and the radio frequency filter circuit component (2) at least comprises 5 sections of LC resonance filter circuits; the LC resonance filter circuit comprises an LC parallel resonance circuit (24) and an LC series resonance circuit (25);
the primary high-pulse energy absorption module (31), the secondary high-pulse energy absorption module (32) and the fine-pulse energy absorption module (33) are detachably arranged between the lower part of the substrate (20) and the inner bottom wall of the metal body (14) of the metal shielding box body (1) and connected with the radio frequency output end (13) along the radio frequency input end (12);
the LC resonance filter circuit of the radio frequency filter circuit component (2) between the primary high pulse energy absorption module (31) and the secondary high pulse energy absorption module (32) forms a primary filter network (21), the LC resonance filter circuit of the radio frequency filter circuit component (2) between the secondary high pulse energy absorption module (32) and the fine pulse energy absorption module (33) forms a secondary filter network (22), and the LC resonance filter circuit of the radio frequency filter circuit component (2) between the fine pulse energy absorption module (33) and the radio frequency output end (13) forms a final filter network (23);
the primary filter network (21), the secondary filter network (22) and the final filter network (23) comprise a section of LC parallel resonance circuit (24), and the LC parallel resonance circuit (24) is positioned between the lower part of the substrate (20) and the inner bottom wall of the metal body (14) of the metal shielding box body (1); the LC parallel resonance circuit (24) comprises a parallel resonance inductor and a parallel resonance capacitor, one end of the parallel resonance inductor is electrically connected to a node of a series path between the radio frequency input end (12) and the radio frequency output end (13), and the other end of the parallel resonance inductor is grounded.
2. The filtered strong transient electromagnetic pulse protection architecture of claim 1, wherein: the primary high pulse energy absorption module (31), the secondary high pulse energy absorption module (32) and the fine pulse energy absorption module (33) are one of a gas discharge tube, a transient voltage suppression diode or a semiconductor PIN diode.
3. The filtered strong transient electromagnetic pulse protection architecture of claim 2, wherein: the primary high pulse energy absorption module (31) is a transient voltage suppression diode, and the secondary high pulse energy absorption module (32) and the fine pulse energy absorption module (33) are semiconductor PIN diodes.
4. The filtered strong transient electromagnetic pulse protection architecture of claim 2, wherein: the primary high-pulse energy absorption module (31) is a gas discharge tube or a transient voltage suppression diode, the secondary high-pulse energy absorption module (32) is a transient voltage suppression diode, and the fine-pulse energy absorption module (33) is a semiconductor PIN diode.
5. The filtered strong transient electromagnetic pulse protection architecture of claim 1, wherein: the number of LC resonance filter circuits in the radio frequency filter circuit component (2) is 7, 9 or 11 sections, and the number of LC parallel resonance circuits (24) is at least 3 sections.
6. The filtered strong transient electromagnetic pulse protection architecture of claim 5, wherein: radio frequency filter circuit subassembly (2) include 7 sections LC resonance filter circuit, respectively be the series connection in radio frequency input end (12) with one-level LC series resonance circuit, second grade LC series resonance circuit, tertiary LC series resonance circuit and fourth level LC series resonance circuit between radio frequency output end (13) and connect in one-level LC series resonance circuit with one-level LC parallel resonance circuit between the second grade LC series resonance circuit, connect in second grade LC series resonance circuit with second grade LC parallel resonance circuit between the third grade LC series resonance circuit and connect in tertiary LC series resonance circuit with third grade LC parallel resonance circuit between the fourth level LC series resonance circuit.
7. The filtered strong transient electromagnetic pulse protection architecture of claim 6, wherein: the secondary high-pulse energy absorption module (32) is connected between the primary LC parallel resonance circuit and the secondary LC series resonance circuit, and the fine-pulse energy absorption module (33) is connected between the tertiary LC series resonance circuit and the tertiary LC parallel resonance circuit.
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| CN202110663354.4A CN113438034B (en) | 2021-06-15 | 2021-06-15 | Filtering type strong transient electromagnetic pulse protection structure |
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| CN202110663354.4A CN113438034B (en) | 2021-06-15 | 2021-06-15 | Filtering type strong transient electromagnetic pulse protection structure |
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| CN113438034B true CN113438034B (en) | 2022-03-08 |
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