CN204461250U - The high-effect electrostatic defending assembly of a kind of bridge-wire electric detonator wafer-type piezo-resistance - Google Patents
The high-effect electrostatic defending assembly of a kind of bridge-wire electric detonator wafer-type piezo-resistance Download PDFInfo
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- CN204461250U CN204461250U CN201420693377.5U CN201420693377U CN204461250U CN 204461250 U CN204461250 U CN 204461250U CN 201420693377 U CN201420693377 U CN 201420693377U CN 204461250 U CN204461250 U CN 204461250U
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Abstract
The utility model relates to the high-effect electrostatic defending assembly of a kind of bridge-wire electric detonator wafer-type piezo-resistance, comprises a disc PCB and two piezo-resistance electrostatic defending electronic devices.Wherein piezo-resistance by circuit board and pin-human hair combing waste fire loop in parallel, it is in parallel that another piezo-resistance gets angry loop by circuit board and pin-shell.The reverse side of PCB arranges two zigzag discharge electrodes, and Can inwall forms air-gap electrostatic leakage passage between pin-shell, the double insurance effect that form pin-shell electrostatic defending in parallel with electrostatic protection device of zigzag discharge electrode.Electrostatic defending assembly of the present utility model reaches human body more than electrostatic 50kV to pin-shell protection effect, and pin-foot protection effect reaches human body more than electrostatic 30kV, and can stand the repeat impact of static discharge and any performance change can not occur.
Description
Art
Patent of the present invention belongs to electric spark workpiece electrostatic defending electronic device, is particularly applicable to the high-effect electrostatic defending electronic device of responsive type bridge-wire electric detonator.
Background technology
Existing bridge wire form commercial electric detonator is in use easily subject to electrostatic, the impact of stray electrical current produces performance change or accidental ignition.In the process such as production, assembling, storage, transport, operation and maintenance of priming system and armament systems, the harm ubiquity of static discharge, electrostatic has the feature of high voltage, low-yield, high transient state, the coupling of electrostatic discharge energies may impact the ignition quality of electric spark workpiece (sensitivity, the time of ignition etc.) and security performance (safe current etc.), even cause misfire or accidental ignition, system task cannot be completed or cause casualties.
The existing electrostatic defending technological approaches of electric cap is, adopt between pin-shell and insulating materials is set to improve its dielectric strength, thus raising electrostatic breakdown voltage, or air-gap be set between pin-shell, be coated with conducting resinl, the electrostatic leakage such as electric capacity, semiconductor discharge tube passage of releasing to be to improve the antistatic capacity of pin-shell; And the raising of the antistatic effect of pin-pin only has technical measures such as increasing bridge filament diameter, increase bridging plug contact area, raising ignition medicine bursting point at present.By one of above electrostatic defending technological approaches or combination, thus electric cap is made to reach the security requirement of the human body electrostatic 25kV that the standard such as GJB 5309.14-2004 " priming system test method the 14th part: ESD test ", MIL-DTL-23659F-2010 " electric initiator universal design specification ", GBT8031-2005 " commercial electric detonator " specifies.But along with industrial and the electrostatic environment in battlefield, the enhancing day by day of electromagnetic environment interference, along with people improve the understanding of electrostatic interaction mechanism, it is found that the safety indexes of the maximum static electricity on human body's voltage (military electric spark workpiece 25kV, civilian electric cap 10kV) formulated in traditional industrial standard and army's mark standard can not cover, meet the environment for use requirement of modern priming system completely, static electricity on human body's environment the harshest can not be represented.As Ordnance Engineering College Liu Shang closes the extreme body voltages Data-Statistics result of academician and U.S. Sang Diya laboratory, IEEE-USA's report, wherein " Britain's antistatic general specification " is 50kV, " U.S.'s protection test handbook " is 40kV, " the international electrostatic meeting in Beijing " is 35kV ~ 50kV, and Ordnance Engineering College's result of study is 60kV.And the analysis of electric spark workpiece safety testing and theory analysis rarely have report under these stationary electrode end value effects.In addition, electric spark workpiece is in use, repeatedly electrostatic impact is inevitably subject in the middle of the processes such as transport, be reported at present between pin-shell and be coated with conducting resinl, to release electric capacity, the mode of semiconductor discharge tube comes that the electrostatic potential of protection base-shell electrostatic hazard is the highest can reach antistatic 25kV, but when the protection effect of electrostatic potential higher than electrostatic defending technology above-mentioned during 25kV can reduce greatly, to release electric capacity, semiconductor discharge tube can not ensure that electric spark workpiece performance sustains damage or accidental ignition, after high-pressure electrostatic effect 3 times, the protection effect of conducting resinl can reduce greatly, multiple discharge even can cause conducting resinl to lose antistatic capacity, and above-mentioned all electrostatic defending technology all can not be protected sensitive electrical priming system pin-pin loop.Therefore this just requires to find and a kind ofly can protect higher electrostatic potential, is subject to the technical scheme that repeatedly electrostatic impact rear protecting effect is constant, particularly can realize the microminiaturized protective device protected to sensitive electrical priming system pin-pin loop.
Electrostatic prevention structure disclosed in Chinese patent CN201210540239.9 is at detonator rear end extrapolation transverse discharge metal connecting piece, and size is comparatively large, inapplicable long payment to a porter or small size detonator.Adopt crimping mode to be connected between metal connecting piece with detonator payment to a porter, easily cause electrode delamination and protection circuit open circuit, electrostatic discharge protective circuit was lost efficacy.Outside plug type discharge metal connector promotes the manufacturing process difficulty of detonator, if easily cause accidental ignition in the shaping rear extrapolation of detonator and cause danger, and in the shaping front extrapolation of detonator, very large inconvenience and trouble are brought for the manufacturing process of detonator, extrapolation transverse discharge metal connecting piece brings restriction can to the use of detonator simultaneously, when guided missile high overload, the horizontal large circuit board of extrapolation is easy to come off to System's composition danger, and when not having unnecessary usage space, the horizontal large circuit board of extrapolation will bring danger to whole system.And this patent does not illustrate the protection effect of electrostatic.
Electrostatic prevention structure disclosed in Chinese patent CN201220055188.6 is only in semiconductor bridge detonator, and only select 1 corner discharge when protection base-shell electrostatic, because product can discharge to product through at least 3 to 5 person-times in transport, assembling process, once may cause fusing distortion to sawtooth after electric discharge, thus losing electrostatic defending effect, multiple discharge can be caused danger after impacting; Described patent does not provide protection effect simultaneously, does not also propose to carry out anti-repeatedly electrostatic impact, does not more propose the size of product size.
Summary of the invention
In order to anti-higher than 25kV electrostatic potential and repeatedly electrostatic impact, patent of the present invention provides a kind of high-effect electrostatic defending assembly of anti-extreme static electricity on human body's voltage, it not only protects to pin-shell but also to pin-pin static discharge, can also protect repeatedly electrostatic impact simultaneously.
Patent of the present invention solves the technical scheme that its technical problem adopts:
For the operating voltage of the highest static electricity on human body's voltage pole end value 50kV, maximum surge current 500A and electric cap, determine the parameter such as the maximum surge current of piezo-resistance, peak power, operating voltage, clamping voltage (breakdown voltage), surge current rise time, surge current discharge time successively, again for mounting structure and the size of electric cap, determine the shape and size of piezo-resistance, assembly technology again, finally determine the shape of PCB, wire structures and size.
For small size electric cap pin-pin and pin-shell performance requirement of electrostatic defending electronic device and installation requirement, propose a kind of disc PCB scheme, have following function concurrently: fixing electrostatic defending electronic device is connected with payment to a porter circuit and is connected with shell circuit, provides electrostatic leakage the air gap between pin shell.The circuit structure of described PCB comprises three profiled metal pads, two metal discharge poles, two metallization via holes.
The front of PCB arranges three profiled metal pads, longer rectangular pads, a shorter rectangular pads and a circular arc pad; The first half of longer rectangular pads and shorter rectangular pads partner electrode, for connecting the two poles of the earth of a microminiaturization SMD piezo-resistance electrostatic defending electronic device, electrostatic protection device and electric spark workpiece pin-human hair combing waste fire loop is made to form parallel circuit, form pin-pin electrostatic leakage passage; Lower Half and the circular arc pad of longer rectangular pads form another pair of electrodes, for connecting the two poles of the earth of the microminiaturized SMD piezo-resistance electrostatic defending electronic device of another, make electrostatic protection device and electric spark workpiece pin-shell get angry loop and form parallel circuit, form electrostatic leakage passage between pin-shell; The safeguard function in corresponding electrostatic firing loop is then only possessed, if when connecting two electrostatic protection devices, possess the safeguard function in electric spark workpiece pin-pin, pin-shell electrostatic firing loop simultaneously when only connecting an electrostatic protection device.
The reverse side of PCB arranges the zigzag discharge electrode of two symmetric shapes, for the protection of pin shell static discharge, and repeatedly electrostatic discharge protective can be realized, the double insurance effect that constitute pin-shell electrostatic defending in parallel with electrostatic protection device of zigzag discharge electrode.
For the requirement of shelter of small size electric cap to extreme electrostatic potential and repeatedly high voltage electrostatic discharge, the high-effect electrostatic defending assembly of the microminiaturized wafer-type piezo-resistance of the one that the present invention proposes, comprises a disc PCB, a piezo-resistance in parallel with pin-pin and a piezo-resistance in parallel with pin-shell.
One of described high-effect electrostatic defending assembly key technology is the method for designing of electrostatic protection device Selecting parameter.The operating voltage of described piezo-resistance is less, better to the shunting of electric spark workpiece pin pin electrostatic discharge energies.The operating voltage of piezo-resistance selects the normal working voltage being higher than sensitive electrical priming system, operating voltage is too low, may affect the normal working performance of electric spark workpiece, and too high meeting makes the clamping voltage of piezo-resistance also higher, unfavorable to the electrostatic protection effect of sensitive electrical priming system.When the two poles of the earth of piezo-resistance be applied with reverse electrostatic discharge pulses and higher than its breakdown voltage time, its two interpolar extremely promptly changes Low ESR into by high impedance, make two interpolar voltage clamps in the predetermined value of a low voltage, make sensitive electrical priming system from the damage of high-pressure electrostatic pulse or ignition.After high-pressure electrostatic transient pulse disappears, two interpolars of piezo-resistance return to again original high impedance status, can not affect the normal electrical performance of protected device.By theory calculate and verification experimental verification, suitably select pressure-sensitive resistive performance parameter, can more than 90% be reached to the split ratio of sensitive electrical priming system pin pin electrostatic discharge energies.As the normal firing voltage 12V/6.8 μ F for electric spark workpiece, during protective device selection TG0402ML240K type piezo-resistance, operating voltage is 12V, operating voltage is higher than 1.5 times of the normal firing voltage of electric spark workpiece, then electric test is carried out with static discharge voltage 50kV, the maximum discharge current produced in single RC loop standard static electric charge model circuit is 100A, and the current peak flowing into electric spark workpiece only has 10A, the current peak flowing into piezo-resistance is 90A, and namely the split ratio of piezo-resistance is 90%.The protection effect highly significant of piezo-resistance as can be seen here.
For the electrostatic defending between pin shell, shown by a large amount of ESD test, for the sensitive electrical priming system of pin shell electrostatic firing voltage 2.3kV, when adopting same TG0402ML240K type piezo-resistance as protective device, for static discharge voltage 50kV, carry out, in discharge test, all can reaching antistatic more than voltage 50kV to described sensitive electrical priming system pin shell with single RC loop standard static electric charge model circuit and Sandia static electric charge model, IEEE static electric charge model circuit three kinds of static electric charge model circuit.
The antistatic capacity of described high-effect electrostatic defending assembly is much higher than the ceiling voltage 25kV technical indicator that existing military standard and industrial standard require Electrostatic Safety for Electric Explosive Device, pin-pin antistatic capacity can reach human body more than electrostatic 30kV, pin-shell antistatic capacity can reach anti-extreme static electricity on human body more than 50kV, and can reach the security requirement of anti-repeatedly static discharge.
The invention has the beneficial effects as follows: the antistatic capacity of (1) piezo-resistance of the present invention high-effect electrostatic defending assembly is much higher than the ceiling voltage 25kV technical indicator that existing military standard and industrial standard require Electrostatic Safety for Electric Explosive Device, pin-pin antistatic capacity can reach human body more than electrostatic 30kV, pin-shell antistatic capacity can reach anti-extreme static electricity on human body more than 50kV, and can reach the security requirement of anti-repeatedly static discharge.(2) circular PCB size is little, diameter only has 3.4mm ~ 4.2mm, thickness 0.3mm ~ 0.5mm, described PCB can assemble 2 microminiaturized SMD piezo-resistance electrostatic protection devices, and on the electrode plug that can be assemblied in same diameter and in the electric spark workpiece shell of same inner diameter.(3) thickness of wafer-type piezo-resistance electrostatic defending assembly only has 0.8mm ~ 1.5mm, very little on the impact of electric spark workpiece height.
Below in conjunction with drawings and Examples, the invention will be further described.
Accompanying drawing explanation
Fig. 1 is electrostatic defending assembly circuit plate wiring front view.
Fig. 2 is electrostatic defending assembly circuit plate wiring reverse view.
SMD piezo-resistance structural representation installed by electrostatic defending assembly circuit plate to Fig. 3.
Fig. 4 is glass electrode plug structure profile.
Fig. 5 is that high-effect electrostatic defending assembly and electrode plug assemble schematic diagram.
Fig. 6 is that high-effect electrostatic defending assembly and electric cap assemble schematic diagram.
Detailed description of the invention
Composition graphs 1, Fig. 2, Fig. 3, antistatic plate comprises the copper-clad plate 7,8 of PCB plectane 1, three metal pads 2,5,6, two metallization via hole 2,3 and two band sawtooth in a band two holes, two metallization via holes 2,3 are just defined after two hole metallizations of the pcb board 1 with two holes, height top, hole is consistent with metal pad height, following and copper-clad plate is highly consistent, and be connected one with the via hole 2 that metallizes in pcb board 1 top the rectangular metal pad 4 be with centered by chamfering and the hole circle heart; Another metallization via hole 3 is connected the short rectangular metal pad 5 of another one; An arc pad 6 mutually neat with the edge of PCB plectane is had for 5 times at this short soldering plate; The via hole 2,3 that metallizes with two below pcb board is connected two and is with the arc copper-clad plate 7,8 of multiple sawtooth.Two rectangular metal pads 4,5 weld the two poles of the earth of protection base-pin piezo-resistance 9, and long rectangular pads 4 welds the two poles of the earth of protection base-shell piezo-resistance 10 with curved metal pad 6, thus define the antistatic plate of band piezo-resistance.
Wherein metal pad 4 Chamfer Edge is not less than 0.5mm apart from the edge of PCB plectane, and metal pad spacing used is not less than 0.3mm.Arc copper-clad plate 7,8 with multiple sawtooth, sawtooth wedge angle is 60 degree, and sawtooth point is 0.5mm apart from PCB plectane edge, and two copper-clad plate 7,8 spacing are not less than 0.5mm.
Composition graphs 3-6, the bridge-wire electric detonator of the antistatic environment of patent of the present invention comprises band piezo-resistance antistatic plate, electrode plug 12, bridge silk 11, ignition charge, priming, export medicine, shell 16, the copper-clad plate 7 of the antistatic plate of piezo-resistance will have been welded, the bottom 13 (the other side of welded bridge silk) of 8 sides and electrode plug is by metallizing via hole 2, 3 through payment to a porter 14, combine after 15, because copper-clad plate forms air-gap higher than pcb board 1 between copper-clad plate and housing 16, metallization via hole 2, 3 with payment to a porter 14, 15 weld, detonator is formed according to detonator manufacture craft, closing in back casing 16 is connected with arc pad 6.Thus existing air-gap has piezo-resistance again in protection base-shell electrostatic, protect in protection base-pin electrostatic piezo-resistance.
For the needs that Bridgewire EED pin pin ESD protects, following several respects content in the type selecting of piezo-resistance, should be considered:
1. pressure sensitive voltage, i.e. breakdown voltage or threshold voltage.It is greater than the normal working voltage of protected device, affects performance when preventing priming system from normally working due to piezo-resistance shunting.
2. clamping voltage Vc refers to the maximum voltage value that piezoresistor two ends can bear, and it is less than the static damage voltage of protected device, this makes it possible to effective protection device.
3. discharge capacity, namely the peak value of maximum surge current is environment temperature is in 25 DEG C of situations, for the impulse current waveform of regulation and the dash current number of times of regulation, the change of pressure sensitive voltage is no more than ± 10% time maximum surge current value.
4. rated power, consumable peak power under the environment temperature of regulation.It is greater than the peak power of electrostatic interaction, otherwise piezo-resistance will be damaged, and can not play protective action or reuse.
5. the response time is exactly the time that piezo-resistance voltage reaches that operating voltage starts to playing a protective role, and it must be less than the time of static discharge.
The electrode plug size 3.45 × 3mm of sample, bridge silk is 10 μm of PtW alloys, product resistance 3 ~ 9 Ω, ignition operating voltage 12V (6.8 μ F), and the energy acting on priming system when can calculate normal work is 4.9 × 10
-4j; The critical firing voltage 18.45kV of pin pin electrostatic, can obtain that electric spark workpiece operating voltage is maximum can not more than 22V, peak power 88.6W.
(1) according to product specification, sample normal working voltage is 12V (6.8 μ F), and nargin is crossed in reliability consideration, then the reliable firing voltage of this priming system is 12V;
(2) show that the critical firing voltage of sample electrostatic environment is 18.45kV according to the test of product electrostatic, the voltage that can be calculated the loading of priming system two ends is 22V, and security consideration nargin is 1.3, then the maximum voltage of misfiring of this priming system electrostatic is 15.5V;
(3) security reliability of the selection combination product of protective device determines the parameter choose of protective device, and therefore choosing piezo-resistance pressure sensitive voltage should between 12V ~ 15.5V;
(4) maximum deboost is selected to be less than the maximum voltage of misfiring of priming system electrostatic is 15.5V;
(5) current waveform specified should be consistent in Electrostatic discharge waveforms, and the dash current number of times of regulation should be greater than 10 times;
(6) when can draw static discharge by old xerographic paper discharge current time waveform, the rise time is several nanosecond, and therefore the response time of protective device must be less than nanosecond (10
-9s);
(7) according to the mono-RC model of the electrostatic discharge environments 50kV of the limit (series connection 5k Ω), rated output is 598.56W.
Therefore TG0402ML240K type piezo-resistance chosen by this sample.
The technique effect of patent of the present invention is, antistatic plate utilizes the design of the multiple sawtooth copper-clad plate of band to make the air-gap forming multiple discharge breakdown between pin-shell, by metallizing, via hole is connected with payment to a porter simultaneously, curved metal pad is connected with housing, payment to a porter and housing is made to be connected the two poles of the earth of piezo-resistance respectively, thus play dual fail-safe when protection base-shell static discharge, pin-shell protection effect can get at static electricity on human body 50kV, is doubled than 25kV in GJB5309.14; Be connected with payment to a porter by metallization via hole, two payment to a porter are connected with the two poles of the earth of piezo-resistance respectively, play a role at protection base-pin electrostatic, pin-foot protection effect can get at static electricity on human body 30kV; No matter characteristic due to piezo-resistance is protect at pin-shell or can both stand the repeat impact of static discharge and any change can not occur on pin-foot protection if determining.
It should be noted that; the foregoing is only preferred embodiment of the present invention; not thereby limit scope of patent protection of the present invention, the present invention can also carry out the improvement of materials and structures to the structure of above-mentioned various parts, or adopts technically equivalent ones to replace.Therefore the equivalent structure change that all utilizations description of the present invention and diagramatic content are done, or directly or indirectly apply to other correlative technology fields and be all in like manner all contained in the scope that the present invention contains.
Claims (6)
1. the high-effect electrostatic defending assembly of bridge-wire electric detonator wafer-type piezo-resistance, comprise a disc PCB (1), a piezo-resistance in parallel with pin-pin and a piezo-resistance in parallel with pin-shell, it is characterized in that the metal pad (4) in PCB front, the two poles of the earth connecting a SMD piezo-resistance (9) between metal pad (5) are formed to get angry loop electrostatic leakage passage in parallel with pin-pin bridge silk, the metal pad (5) in circuit board front, the two poles of the earth connecting a SMD piezo-resistance (10) between metal pad (6) form the electrostatic leakage passage in parallel with pin-shell medicament ignition hazard passage, the reverse side of PCB arranges the zigzag copper-clad plate discharge electrode of two symmetric shapes, be used as and Can inwall form electrostatic leakage loop between pin-shell, the double insurance effect that form pin-shell electrostatic defending in parallel with electrostatic protection device of zigzag copper-clad plate discharge electrode.
2. high-effect electrostatic defending assembly according to claim 1, it is characterized in that the microminiaturization of circular PCB, diameter only has 3.4mm ~ 4.2mm, thickness only has 0.3mm ~ 0.5mm, described PCB can hold wiring and the assembling of 2 microminiaturized SMD piezo-resistance electrostatic protection devices, and on the small size electrode plug that can be assemblied in same diameter and in the small size electric spark workpiece shell of same inner diameter.
3. high-effect electrostatic defending assembly according to claim 1, the front that it is characterized in that PCB (1) arranges three profiled metal pads, the metal pad (4) of a longer rectangle, a shorter metal pad (5) for rectangle and the metal pad (6) of a circular arc; The first half of metal pad (4) and metal pad (5) partner electrode, for connecting the two poles of the earth of a SMD piezo-resistance electrostatic protection device (9), described piezo-resistance protective device and electric spark workpiece pin-human hair combing waste fire loop form parallel circuit, form pin-pin electrostatic leakage passage; Lower Half and the metal pad (6) of metal pad (4) form another pair of electrodes, for connecting the two poles of the earth of the SMD piezo-resistance electrostatic protection device (10) of another, described piezo-resistance protective device and electric spark workpiece pin-shell medicament are got angry loop and are formed parallel circuit, form electrostatic leakage passage between pin-shell; The safeguard function in corresponding electrostatic firing loop is then only possessed, if when connecting two electrostatic protection devices, possess the safeguard function of electric spark workpiece pin-pin, pin-shell electrostatic firing simultaneously when only connecting an electrostatic protection device.
4. high-effect electrostatic defending assembly according to claim 1, it is characterized in that the reverse side of PCB arranges the zigzag copper-clad plate discharge electrode of two symmetric shapes, zigzag corner angle is 60 degree, the wedge angle number of teeth gets 5 ~ 8 wedge angles, be uniformly distributed, each wedge angle and PCB (1) outer rim all stay the air gap of 0.3mm, be used as and Can inwall form electrostatic leakage loop between pin-shell, the double insurance effect that form pin-shell electrostatic defending in parallel with electrostatic protection device of zigzag copper-clad plate discharge electrode.
5. high-effect electrostatic defending assembly according to claim 1, when it is characterized in that PCB is fitted into electric spark workpiece, zigzag discharge electrode one is facing to electrode plug side, and and electrode plug, retain skim the air gap between inner wall of tube shell and form air-gap electrostatic leakage passage, wherein electrode plug material is the insulating materials such as plastic plug, glass stopper or ceramic plug, must not gluing and fill other material in the electrostatic leakage passage of the air gap, discharging gap position should be arranged in as far as possible away from the place of priming system powder charge, and ensures have medium to cut off between powder charge; Two of PCB metallization via holes (2), (3) and payment to a porter (14), (15) adopt to weld and form circuit and be connected, and make the arc pad (6) of PCB form circuit with shell be connected by shell bottling technique or conducting resinl technique.
6. high-effect electrostatic defending assembly according to claim 1, is characterized in that the thickness of wafer-type piezo-resistance electrostatic defending assembly only has 0.8mm ~ 1.5mm, very little on the impact of electric spark workpiece height.
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|---|---|---|---|
| CN201420693377.5U CN204461250U (en) | 2014-11-18 | 2014-11-18 | The high-effect electrostatic defending assembly of a kind of bridge-wire electric detonator wafer-type piezo-resistance |
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| CN201420693377.5U CN204461250U (en) | 2014-11-18 | 2014-11-18 | The high-effect electrostatic defending assembly of a kind of bridge-wire electric detonator wafer-type piezo-resistance |
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| CN204461250U true CN204461250U (en) | 2015-07-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104330001A (en) * | 2014-11-18 | 2015-02-04 | 北京理工大学 | High-effect electrostatic protective component of disk type voltage dependent resistor for bridge-wire electric detonator |
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2014
- 2014-11-18 CN CN201420693377.5U patent/CN204461250U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104330001A (en) * | 2014-11-18 | 2015-02-04 | 北京理工大学 | High-effect electrostatic protective component of disk type voltage dependent resistor for bridge-wire electric detonator |
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