CN104038174A - Intelligent anti-electromagnetic-pulse and anti-surge filter for shielding shelters - Google Patents
Intelligent anti-electromagnetic-pulse and anti-surge filter for shielding shelters Download PDFInfo
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- CN104038174A CN104038174A CN201310069068.0A CN201310069068A CN104038174A CN 104038174 A CN104038174 A CN 104038174A CN 201310069068 A CN201310069068 A CN 201310069068A CN 104038174 A CN104038174 A CN 104038174A
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Abstract
The invention relates to an intelligent anti-electromagnetic-pulse and anti-surge filter for shielding shelters. The intelligent anti-electromagnetic-pulse and anti-surge filter comprises a shielding box which is internally equipped with a shielding chamber filter, an EMP generator and a digital oscilloscope. The input end of the shielding chamber filter is connected with the EMP generator, and the output end of the shielding chamber filter is connected with the digital oscilloscope. The shielding box is further provided with an EMI filter, and the EMI filter is internally provided with a differential-mode inductor and a common-mode inductor. The clamping characteristics and the insertion loss of the electromagnetic pulse filter provided by the invention are analyzed by using PSpice simulation. The filter provided by the invention can attenuate EMP to a safe level without the need for TVS or MOV auxiliary components, and is reliable in use.
Description
Technical field
The present invention relates to a kind of filter, relate in particular to a kind of filter and method thereof that prevents electromagnetic pulse.
Background technology
The energy of the electromagnetic pulses such as high-altitude nuclear electromagnetic pulse (HEMP), Lightning Electromagnetic Pulse (LEMP) is huge, rising edge is extremely short, spectrum distribution is extremely wide, and they are propagated by conduction and two kinds of modes of radiation, and filter is a kind of technical measures that suppress conducted interference.But, common filter can not play inhibitory action to them, even can be broken, thereby makes a lot of electronic equipment cisco unity malfunctions, especially as the shelter of Field Operational command centre, design that to have the filter of tempest ability very necessary.
A large amount of actual measurements and theoretical research prove, nuclear explosion occurs, and while particularly there is nuclear explosion in high altitude, follow and occur short time (at the us order of magnitude) strong electromagnetic radiation, and we call electromagnetic pulse (EMP) this special electromagnet phenomenon.
Through measuring and calculating, the nuclear explosion in high altitude of 100,000 tons of equivalents, the whole energy that produce are about 4.2*10+15 joule, wherein, what radiate with electromagnetic energy is about 10+11 joule, this is very huge energy, it can make to be subject to backwoodsman electronic equipment that EMP affects to afford the impact of the above EMP energy of erg-ten, just be enough to make a lot of electronic components to completely lose ability to work much smaller than the EMP energy of erg-ten, for example, only need the EMP energy impact of 2*10-5 joule, just can make integrated circuit MC71S lose efficacy; Only need 2*10-7 joule just can make microwave diode IN238 burn, harassing and wrecking electronic circuit and make it can not steady operation EMP energy lower, for example, only need the EMP energy of 4*10-10 joule, just can make the J – K trigger of SF – 50 dap; Only need the EMP energy of 2 × 10-9 joule just can make FC2001 memory in computer get to deposit and make mistakes, therefore, research EMP is to the damage of electronic devices and components and equipment and their protection, and meaning is very great.
For preventing the breaking-up of EMP to electronic equipment and system, they power line and holding wire on filter will be set, we are called EMP filter this filter.
By multiple electromagnetic interface filter being loaded to the experiment of EMP signal, the control abilities of auxiliary element to EMP such as transition inhibition or piezo-resistance are checked, Preliminary Results shows, well-designed electromagnetic interface filter, the auxiliary element that suppresses (TVS) or piezo-resistance (MOV) and so on without transition, still has good inhibition ability to EMP.
By traditional way, conventional electromagnetic interface filter adds the electronic component that transition suppresses (TVS) or piezo-resistance (MOV), just can make EMP filter, such filter can protect EMP to electronic equipment and system, also can protect the destruction that under certain condition, thunder and lightning causes, as induction lightening signal, but, so the EMP energy that such filter bears is very limited, to the filter made from TVS, because the impact energy that TVS can bear is limited, run into the harassing and wrecking that energy is large, can cause that clamp current sharply increases, power consumption increases severely, TVS will damage, cause the inefficacy of EMP filter, thereby can not protect the destruction of EMP to equipment and system.For MOV element, the impact energy that it can bear can be larger than TVS,, often stands the impact of EMP or thunder and lightning, and its performance can decline.The impact that stands 10 left and right was just likely lost efficacy, and lost the protective capacities to EMP and thunder and lightning.
Summary of the invention
Main purpose of the present invention is, overcome the defect that existing filter exists, and provide a kind of intelligent tempest, antisurge filter for Novel shielding shelter, technical problem to be solved is the reliability of raising equipment, strong shock resistance, thereby be more suitable for practicality, and there is the value in industry.
The object of the invention to solve the technical problems realizes by the following technical solutions.The one shielding proposing according to the present invention is intelligent tempest, antisurge filter for shelter, comprise shielding box, in described shielding box, be provided with shielded enclosure filter, EMP generator and digital oscilloscope, the input of described shielded enclosure filter is connected with EMP generator, the output of described shielded enclosure filter is connected with digital oscilloscope, described shielded enclosure box is also provided with electromagnetic interface filter, comprises differential mode inductance and common mode inductance in described electromagnetic interface filter.
Aforesaid intelligent tempest, antisurge filter for shielding shelter, the input of described shielding box filter is connected by shielded type cable with EMP generator.
Aforesaid intelligent tempest, antisurge filter for shielding shelter, described shielding box outer setting has ground network.
Aforesaid intelligent tempest, antisurge filter for shielding shelter, in described shielding box, being connected with electromagnetic interface filter to hold is provided with attenuator.
Aforesaid intelligent tempest, antisurge filter for shielding shelter, be provided with resistance in described shielding box.
Aforesaid intelligent tempest, antisurge filter for shielding shelter, the resistance arranging in described shielding box has two at least.
By technique scheme, the present invention shields intelligent tempest for shelter, antisurge filter at least has following advantages:
Electromagnetic pulse filter of the present invention, clamp characteristic and the insertion loss of electromagnetic pulse filter that utilized PSpice simulation analysis, this filter does not need, with TVS and MOV auxiliary element, but EMP to be decayed to safe level, uses reliable.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to better understand technological means of the present invention, and can be implemented according to the content of specification, below is described in detail as follows with preferred embodiment of the present invention.
Brief description of the drawings
Fig. 1 is structural representation of the present invention.
embodiment
Technological means and effect of taking for reaching predetermined goal of the invention for further setting forth the present invention, to intelligent tempest, its embodiment of antisurge filter, feature and effect thereof for shielding shelter of proposing according to the present invention, be described in detail as follows.
The intelligent tempest of shielding shelter of the present invention, antisurge filter, comprise shielding box 2, in shielding box 2, be provided with shielded enclosure filter 7, EMP generator 3 and digital oscilloscope 10, the input of shielded enclosure filter 7 is connected by shielded type cable 12 with EMP generator 3, the output of shielded enclosure filter 7 is connected by shielded type cable 12 with digital oscilloscope 10, digital oscilloscope 10 is arranged in shielded enclosure 1, in shielding box 2, be also provided with electromagnetic interface filter 5, in electromagnetic interface filter 5, comprise differential mode inductance 13 and common mode inductance 14, shielding box 2 outer setting have ground network 8, the end that is connected with electromagnetic interface filter 5 in shielding box 2 is provided with the first attenuator 6, the end that is connected with EMP filter 3 in shielding box 2 is provided with the second attenuator 11, in shielding box 2, be also provided with the first resistance 4 and the second resistance 9.
Comparative example
First, electromagnetic interface filter 5 is placed in the electromagnetic interface filter 5 insertion loss test shielding boxs 2 that standard specifies, with shielded enclosure 1, shielding box 2, EMP generator 3, the first resistance 4, electromagnetic interface filter 5, the first attenuator 6, shielded enclosure filter 7, ground network 8, the second resistance 9, digital oscilloscope 10, the second attenuator 11, the input and output of tested filter are connected with digital oscilloscope 10 with EMP generator 3 respectively with shielded type cable 12, arranging is like this that the electromagnetic radiation producing for fear of EMP generator 3 generates induced voltage on input and output cable, have influence on test result.
Secondly, that output amplitude can reach the Shuangzi of 250,000 volts and counts waveform EMP generator 4 as the source of experiment, the height of output EMP amplitude can be controlled by input voltage, in order to obtain the input voltage of applicable EMP amplitude as electromagnetic interface filter 5, also, at the output of EMP generator 3, the method for employing water receiving electric resistance partial pressure further regulates and controls the input voltage of filter.
The 3rd, in order to ensure the accurate recording of input and output side voltage magnitude of tested electromagnetic interface filter 5, digital oscilloscope 10 is placed in EM shielded room 1, the impact that the radiation that release EMP generator 3 produces causes measurement result, sampled signal from filter input end and output also will be passed through suitable attenuator, after wave guide through walls, receive the input port of digital oscilloscope, the waveform that guarantee is recorded to is in oscillographic range ability, also with computer, input and output side voltage magnitude is processed, then, input and output side waveform visual pattern be illustrated in a width figure.
On common single-phase 250V/50Hz 60A electromagnetic interface filter 5 installing filter positions, this filter is by common mode (CM) inductance, common mode inhibition electric capacity (Cy) and differential mode suppress electric capacity (Cx) composition, when experiment, EMP is added between the phase line (L) or center line (N) terminal and ground (being shell) of input, accurate in order to ensure to test, connector on the cable being connected with EMP source and electromagnetic interface filter 5 shielding cases all should adopt and can bear high-tension product, before experiment, check with 10,000 volts of direct voltages, occur without puncturing with corona phenomenon.
Digital oscilloscope 10 is recorded to the waveform of common electromagnetic interface filter 5 input and output sides, the EMP amplitude of its input is 1670V, the amplitude of output waveform is 632V, there are obvious delay now in input waveform and going out of output waveform, from data above, this electromagnetic interface filter 5 is undesirable to the inhibition ability of EMP, because add after EMP between L and ground or N and ground, there is very large electric current to flow through one group of coil of common mode inductance, common mode inductance is saturated very soon, equilibrium condition is destroyed, inductance value sharply declines, common mode (CM) insertion loss of electromagnetic interface filter reduces greatly, the control ability of EMP is become to very poor.
In addition, between its input and output terminal, have electromagnetic coupled, its frequency is higher, and this coupling can be stronger.Because the rising front of the EMP signals of several kilovolts is only 10ns left and right, be directly coupled to its output from the input of filter with regard to having energy.This is also that it is controlled the ability of EMP and becomes one of very poor reason, and obviously, it can not realize the task of controlling EMI and EMP simultaneously.
Embodiment 1
After the result of analyzing by common electromagnetic interface filter loading EMP testing, we improve design, have developed the electromagnetic interface filter 5 of a kind of single-phase 250V/50Hz, 60A.
This is a kind of multistage electromagnetic interface filter 5 that contains differential mode inductance 13 and common mode inductance 14, Cy capacitor adopts feedthrough capacitor, test by the method for the installation of above-mentioned electromagnetic interface filter 5 and loading EMP, and the waveform of input and output is delivered to computer and process, enable in same width figure, their waveform to be compared.
In the time that input EMP amplitude is 3500V, the amplitude of filter output is 320V, apparent, the ability that it controls EMP is better than common electromagnetic interface filter 5, this is that inductance core is difficult for saturated, and the insertion loss of filter low side is obviously improved because the differential mode inductance overload capability of special development is strong.Without adding under the condition of TVS and MOV element, just can realize the good control to EMP signal.This is the desired EMP filter of user just.
When experiment, between its input and output terminal, have electromagnetic coupled, reduce the decay to EMP, can in the time using installation, manage to improve, for example, utilize the existing shielding of equipment or system, the input and output terminal of filter is kept apart, make the electromagnetic coupled between them be controlled to minimum, easily row effective method of one that Here it is.
Make thus us expect, there is feed-through capacitor miscellaneous to be widely used in the electronic equipments such as communication, navigation, radar, Aero-Space, naval vessel, tank, shelter and system, evident characteristic in application is that the shell of feed-through capacitor organically combines together with the shielding of equipment or system, make the electromagnetic isolation between the input and output terminal of filter good, so, the ability that they control EMP how
In order to understand fully this problem, we have selected two kinds of structure punching filters identical and that parameter is different to control the test of EMP, this installation method has reflected practical situations faithfully, although electromagnetic interface filter 5 can require EMP signal controlling level to user, whether can better control in addition their distributed constant of filter of EMP signal, be that distributed inductance and distributed capacitance are roughly the same, main difference between them is the capacity difference of two ends lumped parameter capacitor, when A group parameter, is 2 × 1uF, when B group parameter, be 2 × 4.7uF, the insertion loss of the insertion loss characteristic B group parameter filter low frequency end of the two is good more a lot of than A group parameter, experimental result above obviously illustrates, the capacitance of its feed-through capacitor is larger, its ability of controlling EMP is just stronger, this is because after the signal of the such fast transient of EMP is added on the capacitor of filter input end, voltage on capacitor is not follow at once variation, the variation of its voltage will be followed rule below, be △ V=△ Q/C, △ V is the rate of change of condenser voltage, △ Q is the rate of change of electric charge on capacitor, △ Q is a constant, when the reference record of test B group is 7440V, the output amplitude recording is 100V, be not difficult to find out from above formula, 74.4 times are reduced than input range, therefore, capacity is larger, the variation of voltage, be that △ V will be less, Here it is, and why B group parameter filter is organized the good reason of parameter to the control ability of EMP than A.
Press traditional concept, any test that exceedes filter puncture voltage is all strictly forbidden, because it can cause the punch through damage of filter, we are studying the structure and parameter of this filter, analyze after the characteristic of EMP signal, after repeated loading except the diameter of center conductor is slightly different, the parameter of filter is not observed significant change, when the amplitude of EMP is 6912V, its output amplitude is 300V, output waveform obviously postpones, and it is a lot of that Duration Ratio has been inputted pulse width, if only investigate the variation of amplitude, 23 times of above decay are reached, it is visible that it is fine to the inhibition ability of EMP.
1. the present invention is not using under the condition of MOV and TVS element, and the electromagnetic interface filter 5 that designs well can be controlled EMI equally, the interference magnitude of EMP can be controlled to very low level again, meets the requirement of relevant devices and system.
2. in punching filter being carried out to EMP test and analyzing, confirm, can load than the high a lot of EMP amplitude of its puncture voltage and can not damage any parameter, this is our discovery in practice, thereby rewrite the traditional concept that can not load the EMP signal that exceedes test voltage amplitude, in the time that application conditions allows with jumbo punching filter, EMP can be controlled to quite low level.
3. in practicality, note the laying and ground connection of installation, cable of filter.
The above, it is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, although the present invention discloses as above with preferred embodiment, but not in order to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, when can utilizing the technology contents of above-mentioned announcement to make a little change or being modified to the equivalent embodiment of equivalent variations, in every case be the content that does not depart from technical solution of the present invention, any simple modification of above embodiment being done according to technical spirit of the present invention, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (6)
1. one kind shields intelligent tempest, antisurge filter for shelter, comprise shielding box, in described shielding box, be provided with shielded enclosure filter, EMP generator and digital oscilloscope, the input of described shielded enclosure filter is connected with EMP generator, the output of described shielded enclosure filter is connected with digital oscilloscope, it is characterized in that: described shielded enclosure box is also provided with electromagnetic interface filter, comprises differential mode inductance and common mode inductance in described electromagnetic interface filter.
2. intelligent tempest, antisurge filter for shielding shelter according to claim 1, is characterized in that: the input of described shielding box filter is connected by shielded type cable with EMP generator.
3. intelligent tempest, antisurge filter for shielding shelter according to claim 1, is characterized in that: described shielding box outer setting has ground network.
4. intelligent tempest, antisurge filter for shielding shelter according to claim 1, is characterized in that: in described shielding box, being connected with electromagnetic interface filter to hold is provided with attenuator.
5. intelligent tempest, antisurge filter for shielding shelter according to claim 1, is characterized in that: in described shielding box, be provided with resistance.
6. intelligent tempest, antisurge filter for shielding shelter according to claim 5, is characterized in that: the resistance arranging in described shielding box has two at least.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310069068.0A CN104038174A (en) | 2013-03-05 | 2013-03-05 | Intelligent anti-electromagnetic-pulse and anti-surge filter for shielding shelters |
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| CN201310069068.0A CN104038174A (en) | 2013-03-05 | 2013-03-05 | Intelligent anti-electromagnetic-pulse and anti-surge filter for shielding shelters |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110417252A (en) * | 2019-07-17 | 2019-11-05 | 陕西千山航空电子有限责任公司 | A kind of power filter box |
| CN113514702A (en) * | 2021-03-24 | 2021-10-19 | 上海克开电器有限公司 | Test box for insertion loss test |
-
2013
- 2013-03-05 CN CN201310069068.0A patent/CN104038174A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110417252A (en) * | 2019-07-17 | 2019-11-05 | 陕西千山航空电子有限责任公司 | A kind of power filter box |
| CN113514702A (en) * | 2021-03-24 | 2021-10-19 | 上海克开电器有限公司 | Test box for insertion loss test |
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Application publication date: 20140910 |