CN104390532B - A kind of bridge-wire electric detonator high-effect electrostatic protection component of wafer-type TVS pipe - Google Patents

Abstract

The invention relates to a disc-type TVS tube high-efficiency electrostatic protection assembly for a bridge-wire type electric detonator, which comprises a disc-shaped PCB circuit board and two TVS tube electrostatic protection electronic devices. One of the TVS tubes is connected in parallel with the pin-pin firing circuit through the circuit board, and the other TVS tube is connected in parallel with the pin-shell firing circuit through the circuit board. Two zigzag discharge electrodes are arranged on the reverse side of the PCB circuit board, which form the air gap electrostatic discharge channel between the feet and the shell with the inner wall of the metal tube shell. . The electrostatic protection component of the present invention can protect both the foot-shell and the foot-foot to achieve an anti-static effect of more than 50kV on the human body, and can withstand multiple impacts of electrostatic discharge without any performance change.

Description

A disc-type TVS tube high-efficiency electrostatic protection component for a bridge-wire electric detonator

Technical field

The patent of the present invention belongs to the electrostatic protection electronic device of electric pyrotechnics, especially the high-efficiency electrostatic protection electronic device suitable for sensitive bridge wire electric detonator.

Background technique

The existing bridge-wire industrial electric detonators are susceptible to performance changes or accidental ignition due to the influence of static electricity and stray currents during use. In the process of production, assembly, storage, transportation, use and maintenance of pyrotechnics and weapon systems, the hazards of electrostatic discharge are ubiquitous. Static electricity has the characteristics of high voltage, low energy, and high transient. The coupling of electrostatic discharge energy may It will affect the ignition performance (sensitivity, ignition time, etc.) and safety performance (safety current, etc.) of EPDs, and even lead to blind or accidental ignition, making system tasks impossible to complete or causing casualties.

The existing electrostatic protection technology approach for electric detonators is to use insulating materials between the feet and the shell to improve its insulation strength, thereby increasing the electrostatic breakdown voltage, or to set an air gap between the feet and the shell, apply conductive glue, and discharge capacitors. Electrostatic discharge channels such as semiconductor discharge tubes are used to improve the electrostatic protection ability of the foot-shell; and the antistatic ability of the foot-foot is currently only increased by technical measures such as increasing the diameter of the bridge wire, increasing the contact area of the bridge plug, and increasing the explosive point of the explosive. . Through one or a combination of the above electrostatic protection technology approaches, the electric detonator can reach GJB 5309.14-2004 "Test methods for pyrotechnics Part 14: Electrostatic discharge test", MIL-DTL-23659F-2010 "General design specification for electric detonators" , GBT8031-2005 "Industrial Electric Detonators" and other standards stipulate the anti-static 25kV safety requirements for human body. However, with the increasing interference of the electrostatic environment and electromagnetic environment in the industry and the battlefield, and with the improvement of people's understanding of the mechanism of electrostatic interaction, it has been found that the maximum human body electrostatic voltage (military electric fire) formulated in traditional industrial standards and military standards The safety indicators of 25kV industrial products and 10kV civilian electric detonators can no longer fully cover and meet the environmental requirements of modern pyrotechnic products, nor can they represent the most severe human electrostatic environment. For example, academician Liu Shanghe of the School of Ordnance Engineering, Sandia Laboratories of the United States, and the Institute of Electrical and Electronics Engineers of the United States reported the statistical results of extreme human body voltage values. Among them, the British Anti-static General Specification is 50kV, and the American Protective Test Manual is 40kV. Beijing International Electrostatic Conference" is 35kV ~ 50kV, and the research result of Ordnance Engineering Institute is 60kV. However, there are few reports on the safety test analysis and theoretical analysis of EED under the action of these extreme electrostatic values. In addition, electrical explosive devices will inevitably be subjected to multiple electrostatic shocks during use and transportation. Currently, it is reported that conductive glue, discharge capacitors, and semiconductor discharge tubes are applied between the feet and the shell to protect the foot-shell static electricity. The most harmful electrostatic voltage can reach antistatic 25kV, but when the electrostatic voltage is higher than 25kV, the protective effect of the above electrostatic protection technology will be greatly reduced, and the discharge capacitor and semiconductor discharge tube cannot guarantee that the performance of the electric explosive device will be damaged or accidentally ignite. After three times of high-voltage electrostatic action, the protective effect of the conductive adhesive will be greatly reduced, and multiple discharges will even cause the conductive adhesive to lose its electrostatic protection ability, and all the above-mentioned electrostatic protection technologies cannot protect the pin-to-pin circuit of sensitive electrical pyrotechnics. Therefore, it is required to find a technical solution for a miniaturized protective device that can protect against higher electrostatic voltages, has a constant protective effect after being subjected to multiple electrostatic shocks, and can especially protect the foot-to-foot circuits of sensitive electrical explosives.

The anti-static structure disclosed in Chinese patent CN201210540239.9 is to insert a horizontal discharge metal connector at the rear end of the detonator. The size is relatively large, and it is not suitable for long legs or small-sized detonators. The connection between the metal connector and the leg wire of the detonator is connected by crimping, which may easily cause the electrode to fall off and the protection circuit to be disconnected, making the electrostatic protection circuit invalid. The external plug-in discharge metal connector increases the difficulty of the detonator manufacturing process. If the detonator is inserted after the detonator is formed, it will easily cause accidental ignition and cause danger. However, the external insertion of the detonator before the detonator is formed will bring great inconvenience and trouble to the detonator manufacturing process. At the same time, the external insertion of the horizontal discharge metal connector will limit the use of the detonator. In the case of high overload of the missile, the external large horizontal circuit board is easy to fall off and pose a danger to the system. When there is no extra space for use, the external large horizontal circuit board is inserted. Board will bring danger to the whole system. And this patent does not explain the protective effect of static electricity.

The anti-static structure disclosed in Chinese patent CN201220055188.6 is only used in the semiconductor bridge detonator, and only one sharp corner discharge is used to protect the foot-shell static electricity, because the product will pass at least 3 to 5 people during the transportation and assembly process Discharging the product may cause melting and deformation of the sawtooth after one discharge, thus losing the electrostatic protection effect, and danger will occur after multiple discharge impacts; at the same time, the patent does not give a protective effect, nor does it propose anti-static protection for multiple times. Shock, more did not raise the size of the product size.

Contents of the invention

In order to resist electrostatic voltage higher than 25kV and multiple electrostatic shocks, the patent of the present invention provides a high-efficiency electrostatic protection component against extreme human body electrostatic voltage, which not only protects the foot-shell but also feet-foot electrostatic discharge, and at the same time Can protect against multiple electrostatic shocks.

The technical solution adopted by the patent for the present invention to solve its technical problems is:

According to the extreme value of the highest human body electrostatic voltage of 50kV, the maximum surge current of 500A and the working voltage of the electric detonator, the maximum surge current, peak power, reverse working voltage, clamping voltage (breakdown voltage), and surge voltage of the TVS tube are sequentially determined. Current rise time, surge current discharge time and other parameters, and then according to the installation structure and size of the electric detonator, then determine the shape and size of the TVS tube, assembly process, and finally determine the shape, wiring structure and size of the PCB circuit board.

Aiming at the performance requirements and installation requirements of electrostatic protection electronic devices for small-sized electric lightning tube pin-pin and pin-shell, a disc-shaped PCB circuit board scheme is proposed, which has the following functions: fixing electrostatic protection electronic devices, and pin wires The circuit is connected, connected with the circuit of the casing, and provides an air gap for electrostatic discharge between the foot casings. The circuit structure of the PCB circuit board includes three special-shaped metal pads, two metal discharge electrodes, and two metallized via holes.

Three special-shaped metal pads are arranged on the front of the PCB circuit board, a longer rectangular pad, a shorter rectangular pad and an arc-shaped pad; the upper half of the longer rectangular pad and the shorter rectangular pad The pads form a pair of electrodes, which are used to connect the two poles of a miniaturized SMD bidirectional TVS tube electrostatic protection electronic device, so that the electrostatic protection device and the pin-pin ignition circuit of the electrical pyrotechnic product form a parallel circuit to form a pin-pin static electricity The discharge channel; the lower half of the longer rectangular pad and the arc-shaped pad form another pair of electrodes, which are used to connect the two poles of another miniaturized SMD bidirectional TVS tube electrostatic protection electronic device, so that the electrostatic protection device It forms a parallel circuit with the foot-shell ignition circuit of the electric pyrotechnic product, forming a static discharge channel between the foot-shell; when only one electrostatic protection device is connected, it only has the protection function corresponding to the electrostatic ignition circuit. If two electrostatic protection devices are connected At the same time, it has the protection function of the foot-to-foot and foot-to-shell electrostatic ignition circuits of electric pyrotechnics.

Two symmetrical zigzag discharge electrodes are arranged on the reverse side of the PCB circuit board, which are used for the protection of the electrostatic discharge of the foot shell, and can realize multiple electrostatic discharge protection. The zigzag discharge electrode and the electrostatic protection device are connected in parallel to form a foot-shell electrostatic discharge The double insurance function of protection.

Aiming at the protection requirements of small-sized electric detonators against extreme electrostatic voltage and multiple high-voltage electrostatic discharges, the present invention proposes a miniaturized disc-type TVS tube high-efficiency electrostatic protection component, which includes a disc-shaped PCB circuit board, a - a TVS tube connected in parallel with the pin and a TVS tube connected in parallel with the pin-shell.

One of the key technologies of the high-efficiency electrostatic protection component is the design method for parameter selection of the electrostatic protection device. The smaller the maximum reverse working voltage of the TVS tube is, the better the shunting of electrostatic discharge energy to the feet of the electrical pyrotechnics is. The reverse working voltage of the TVS tube should be higher than the normal working voltage of the sensitive electric explosive device. If the reverse working voltage is too low, it may affect the normal working performance of the electric explosive device, and if it is too high, the clamping voltage of the TVS tube will be affected. The higher the value is, the less effective it is for the electrostatic protection of sensitive electrical explosives. When the reverse electrostatic discharge pulse is applied to the two poles of the TVS tube and is higher than its breakdown voltage, the high impedance between the two poles changes extremely quickly to low impedance, so that the voltage between the two poles is clamped at a predetermined value of a lower voltage, Protect sensitive electrical explosives from damage or ignition by high-voltage static pulses. When the high-voltage electrostatic transient pulse disappears, the two poles of the TVS tube return to the original high impedance state, which will not affect the normal electrical performance of the protected device. Through theoretical calculation and experimental verification, if the performance parameters of the TVS tube are properly selected, the shunt ratio of the electrostatic discharge energy to the feet of sensitive electrical explosive products can reach more than 95%. For example, for the normal firing voltage of the electric explosive device 12V/6.8μF, when the protective device selects the SMDJ18CA bidirectional TVS tube, the maximum reverse working voltage is 18V, and the maximum reverse working voltage is 1.5 times higher than the normal firing voltage of the electric explosive device , and then conduct an electrical test with an electrostatic discharge voltage of 50kV. The peak value of the discharge current generated in the single RC loop standard electrostatic model circuit is 100A, while the peak value of the current flowing into the electric explosive device is only 5A, and the peak value of the current flowing into the TVS tube is 95A. That is, the shunt ratio of the TVS tube is 95%, and the electrostatic discharge energy passing through the EED is reduced from 0.64J to 0.000079J, that is, only about one ten thousandth of the electrostatic energy flows into the ignition circuit of the EED bridge wire. It can be seen that the protective effect of the TVS tube is very significant.

As for the electrostatic protection between the foot shells, a large number of electrostatic discharge tests show that for sensitive electrical explosive products with a static ignition voltage of 2.3kV on the foot shells, when the same SMDJ18CA bidirectional TVS tube is used as a protective device, the electrostatic discharge voltage is 50kV. The single RC loop standard electrostatic model circuit and three electrostatic model circuits of Sandia electrostatic model and IEEE electrostatic model circuit were used to discharge the sensitive electric pyrotechnic product leg case, and all of them could reach an antistatic voltage of more than 50kV.

The electrostatic protection ability of the high-efficiency electrostatic protection component is much higher than the technical index of the highest voltage 25kV required by the current military standard and industrial standard for the electrostatic safety of electrical explosives, and the electrostatic protection ability of the foot-foot and foot-shell can reach Anti-extreme human body static electricity above 50kV, and can meet the safety requirements of anti-static discharge of 50kV for many times.

The beneficial effects of the present invention are: (1) the electrostatic protection capacity of the TVS tube high-efficiency electrostatic protection assembly of the present invention is much higher than the highest voltage 25kV technical index of the current military standard and industrial standard for the electrostatic safety requirements of electric pyrotechnics, and the - Both the foot and foot-shell electrostatic protection capabilities can reach over 50kV against extreme human body static electricity, and can meet the safety requirements of anti-50kV multiple electrostatic discharges. (2) The circular PCB circuit board is small in size, with a diameter of only 3.4mm to 4.2mm and a thickness of 0.3mm to 0.5mm. The PCB circuit board can be equipped with two miniaturized patch-type TVS tube electrostatic protection devices, and can be assembled On the electrode plug of the same diameter and in the shell of the electric explosive product with the same inner diameter. (3) The thickness of the disc-type TVS tube electrostatic protection component is only 0.8mm to 1.5mm, which has little effect on the height of the electric explosive device.

The present invention will be further described below in conjunction with drawings and embodiments.

Description of drawings

Figure 1 is a front view of the circuit board wiring of the electrostatic protection component.

Figure 2 is a reverse view of the circuit board wiring of the ESD protection component.

Figure 3 is a schematic diagram of the structure of the SMD TVS tube installed on the circuit board of the electrostatic protection component.

Fig. 4 is a cross-sectional view of the glass electrode plug structure.

Figure 5 is a schematic diagram of the assembly of the high-efficiency electrostatic protection component and the electrode plug.

Fig. 6 is a schematic diagram of the assembly of the high-efficiency electrostatic protection component and the electric detonator.

Figure 7 is a diagram of the relationship between TVS tube power and electrostatic power

detailed description

Combined with Figure 1, Figure 2, and Figure 3, the antistatic sheet includes a PCB circular plate 1 with two holes, three metal pads 2, 5, 6, two metallized via holes 2, 3 and two sawtooth The copper-clad boards 7 and 8, the two holes of the PCB board 1 with two holes are metallized to form two metallized via holes 2 and 3, the height of the upper side of the hole is consistent with the height of the metal pad, and the height of the lower side is the same as the height of the copper-clad board. Consistent, a metallized via hole 2 on the PCB board 1 is connected to a rectangular metal pad 4 with a chamfer centered on the center of the hole; another metallized via hole 3 is connected to another short rectangular metal pad 5; Under the short pad 5 there is an arc-shaped pad 6 that is flush with the edge of the PCB circular board; two metallized vias 2 and 3 are connected to two arc-shaped copper clad plates 7 with multiple serrations under the PCB board ,8. Two rectangular metal pads 4 and 5 are welded to the two poles of the protective pin-pin TVS tube 9, and the long rectangular pad 4 and the arc-shaped metal pad 6 are welded to the two poles of the protective pin-shell TVS tube 10, thereby forming a band TVS tube Anti-static sheet.

The chamfered edge of the metal pad 4 is not less than 0.5mm from the edge of the PCB circular plate, and the distance between the metal pads used is not less than 0.3mm. The arc-shaped copper clad laminates 7 and 8 with multiple serrations have a sharp angle of 60 degrees, and the distance between the serrated sharps and the edge of the PCB circular board is 0.5mm, and the distance between the two copper clad laminates 7 and 8 is not less than 0.5mm.

Combined with Figure 3-6, the bridge wire electric detonator of the patent anti-static environment of the present invention includes an anti-static sheet with TVS tube, electrode plug 12, bridge wire 11, ignition powder, priming powder, output powder, and tube shell 16, which will be welded One side of the copper clad plate 7,8 of the antistatic sheet of the TVS tube is combined with the bottom 13 of the electrode plug (the other side of the welding bridge wire) through the metallized via holes 2,3 after passing through the foot wires 14,15, due to the cladding The copper plate is higher than the PCB board 1 to form an air gap between the copper clad laminate and the shell 16, the metallized vias 2, 3 are welded to the pins 14, 15, and the detonator is formed according to the detonator manufacturing process, and the shell 16 and the arc-shaped Pad 6 is connected. Thereby there are both air gaps and TVS tubes in the protection of foot-shell static electricity, and TVS tube protection in the protection of foot-foot static electricity.

In view of the need for electrostatic discharge protection of the feet and feet of bridge wire electric explosive devices, the following aspects should be considered in the selection of TVS tubes:

① Actual electrostatic discharge injection between the feet is possible in both positive and negative current directions. Therefore, choosing a bidirectional TVS can protect against electrostatic discharge current injection in any direction.

②The maximum reverse working voltage V _RWM of TVS (at this voltage, the leakage current of TVS is only a few μA) is greater than the normal working voltage of the protected device, so as to prevent the performance of pyrotechnic products from being affected by TVS shunting when they work normally.

③The clamping voltage Vc of TVS is the highest limit voltage of the TVS tube, which is smaller than the electrostatic damage voltage of the protected device, so that the device can be effectively protected.

④The peak power of TVS should be selected in accordance with the relationship between TVS tube power and electrostatic power, otherwise the TVS may be burned out.

⑤Response time is the time from when the TVS tube voltage reaches the working voltage to when it plays a protective role, and it must be less than the electrostatic discharge time.

The electrode plug size of the sample is 3.45×3mm, the bridge wire is 10μm PtW alloy, the product resistance is 3～9Ω, and the ignition working voltage is 12V (6.8μF). It can be calculated that the energy acting on the pyrotechnic product during normal operation is 4.9×10 ^-4 J; The critical ignition voltage of static electricity on the feet is 18.45kV, and the maximum working voltage of the available electric pyrotechnics cannot exceed 22.14V, and the peak power is 88.6W.

Protection device selection parameters are based on:

(1) According to the product specifications, the normal working voltage of the sample is 12V (6.8μF), and the reliability is considered to be over-margined, so the reliable ignition voltage of this pyrotechnic product is 12V;

(2) According to the electrostatic test of the product, the critical ignition voltage of the sample electrostatic environment is 18.45kV, and the voltage loaded on both ends of the pyrotechnic product is calculated to be 22.14V, and the safety consideration margin is 1.3. The ignition voltage is 15.5V;

(3) The selection of protective devices is based on the safety and reliability of the product to determine the parameter selection of the protective device, so the maximum reverse working voltage V _RWM of the TVS tube should be selected between 12V and 15.5V;

(4) The clamping voltage of the TVS tube is selected to be less than the static maximum non-ignition voltage of the pyrotechnic product, which is 15.5V;

(5) According to the discharge current time waveform of the electrostatic discharge model, it can be concluded that the rise time of electrostatic discharge is several nanoseconds, so the response time of the protective device must be less than nanoseconds (10 ^-9 s);

(6) According to the limit electrostatic discharge environment 50kV single RC model (5kΩ in series), the calculated power is 598.56W, and the electrostatic discharge environment 50kV discharge time does not exceed 1μs, and then according to the relationship between TVS tube power and electrostatic power, the TVS tube power is fixed for not less than 100W.

Therefore, the maximum reverse working voltage V of the TVS tube should be selected between 12V and 15.5V (the safety margin is 1.3; if it is lower than 12V, the sample will not work normally, and if it is higher than 15.5V, the TVS tube will not have a protective effect) . This sample selects P6KE12CA type and ESD12V32D-C bidirectional TVS tube.

The technical effect of the patent of the present invention is that the anti-static sheet uses the design of multiple sawtooth copper clad plates to form multiple air gaps for discharge breakdown between the feet and the shell, and at the same time it is connected to the feet through metallized via holes, and the curved metal The welding pad is connected to the shell, so that the legs and the shell are connected to the two poles of the TVS tube, so as to play a double insurance when protecting the foot-shell electrostatic discharge. The foot-shell protection effect can already reach 50kV of human body static electricity, which is better than GJB5309.14 The middle 25kV has been doubled; through the metallized via hole and the foot wire connection, the two foot wires are respectively connected to the two poles of the TVS tube, which plays a role in protecting the foot-to-foot static electricity, which is unprecedented in the predecessors. - The effect of foot protection has been able to reach 50kV of human body static electricity; due to the characteristics of TVS tubes, both the foot-shell protection and the foot-foot protection can withstand multiple impacts of electrostatic discharge without any change.

It is worth noting that the above description is only a preferred embodiment of the present invention, and does not limit the scope of patent protection of the present invention. The present invention can also improve the materials and structures of the above-mentioned various components, or use technical equivalents are substituted. Therefore, all equivalent structural changes made by using the description and illustrations of the present invention, or directly or indirectly applied to other related technical fields are also included in the scope of the present invention.

Claims (8)

1. a kind of high-effect electrostatic protection component of wafer-type TVS pipe, including disc PCB (1), one with pin- Pin TVS pipe and a TVS pipe in parallel with pin-shell in parallel, it is characterized in that the positive long rectangular metal pad of PCB (4) the two poles of the earth structure of the SMD TVS pipe electrostatic protection device (9) of first miniaturization, is connected between short rectangular metal pad (5) Into the electrostatic leakage passage in parallel with pin-pin igniter wire ignition loop, the positive long rectangular metal pad (4) of circuit board, arc gold The two poles of the earth for belonging to the SMD TVS pipe electrostatic protection device (10) for connecting second miniaturization between pad (6) are constituted and pin-shell medicine Agent ignition hazard passage electrostatic leakage passage in parallel, the zigzag that the reverse side of PCB arranges two symmetric shapes is covered Copper coin discharge electrode, as electrostatic leakage loop, zigzag copper-clad plate discharge electrode and second between Can inwall composition pin-shell Only SMD TVS pipe parallel connection constitutes the double insurance effect of pin-shell electrostatic protection.

2. high-effect electrostatic protection component according to claim 1, it is characterized in that antistatic capacity is higher than existing military The ceiling voltage 25kV technical indicators that standard and industrial standard are required Electrostatic Safety for Electric Explosive Device, pin-pin and pin-shell electrostatic Protective capacities can reach anti-extreme more than static electricity on human body 50kV, and can reach the peace of anti-50kV multiple static discharge Full property requirement.

3. high-effect electrostatic protection component according to claim 1, it is characterized in that the miniaturization of circular PCB, directly Footpath only has 3.4mm~4.2mm, and thickness only has 0.3mm~0.5mm, and the PCB can accommodate the patch of first miniaturization The wiring of the SMD TVS pipe electrostatic protection device (10) of chip TVS pipe electrostatic protection device (9) and second miniaturization and dress Match somebody with somebody；And may be mounted on the small size electrode plug of same diameter and in the small size electric spark workpiece shell of same inner diameter.

4. high-effect electrostatic protection component according to claim 1, it is characterized in that being arranged on the front of PCB (1) Three profiled metal pads, the metal pad (4) of a longer rectangle, the metal pad (5) of shorter rectangle and The metal pad (6) of one circular arc；The first half and short rectangular metal pad (5) of long rectangular metal pad (4) partner Electrode, the two poles of the earth for connecting first SMD TVS pipe electrostatic protection device (9), the TVS pipe protective device and electric firer The fiery loop of product pin-human hair combing waste constitutes parallel circuit, forms pin-pin electrostatic leakage passage；The lower half of long rectangular metal pad (4) and Curved metal pad (6) constitutes another pair electrode, and two for connecting second SMD TVS pipe electrostatic protection device (10) Pole, the TVS pipe protective device constitutes parallel circuit with electric spark workpiece pin-shell medicament ignition loop, and electrostatic is let out between forming pin-shell Put passage；Then only possesses the safeguard function in corresponding electrostatic firing loop when only connecting an electrostatic protection device, if connection two The safeguard function of electric spark workpiece pin-pin, pin-shell electrostatic firing is then provided simultaneously with during electrostatic protection device.

5. high-effect electrostatic protection component according to claim 1, it is characterized in that the reverse side of PCB arranges two The zigzag copper-clad plate discharge electrode of symmetric shape, zigzag corner angle is 60 degree, and the wedge angle number of teeth takes 5~8 wedge angles, uniform point Cloth, each wedge angle and PCB (1) outer rim stay 0.3mm the air gap, as constituting pin-shell with Can inwall Between electrostatic leakage loop, zigzag copper-clad plate discharge electrode is in parallel with second SMD TVS pipe to constitute the double of pin-shell electrostatic protection Weight safety effect.

6. high-effect electrostatic protection component according to claim 1, it is characterized in that electrostatic protection device parameter selection is set Meter method, the TVS pipe must be two-way TVS pipe, and maximum reverse operating voltage is smaller, to electric spark workpiece pin-pin static discharge The shunting of energy is better, and the working inverse voltage selection of TVS pipe is higher than the normal working voltage of sensitive electric spark workpiece, reverse work Make the normal working performance of the too low then influence electric spark workpiece of voltage, and the too high clamp voltage that can make TVS pipe is also higher, to sensitivity The electrostatic protection effect of electric spark workpiece is unfavorable, for the normal firing voltage 12V/6.8 μ F of certain electric spark workpiece, selects SMDJ18CA The two-way TVS pipe of type is as protective device, and maximum reverse operating voltage is 18V, for static discharge voltage 50kV, in single RC loops The maximum discharge current produced in standard electrostatic precircuit is 100A, and the current peak for flowing into TVS pipe is 95A, and flows into electricity The current peak of priming system only has 5A, and the split ratio of TVS pipe is 95%, by the electrostatic discharge energies of electric spark workpiece pin-pin from 0.64J is reduced to 0.000079J, and only about the electrostatic energy of a ten thousandth flows into electric spark workpiece igniter wire ignition loop.

7. high-effect electrostatic protection component according to claim 1, it is characterized in that when PCB is fitted into electric spark workpiece Facing to electrode plug side, and between electrode plug, inner wall of tube shell, reservation a thin layer the air gap is constituted zigzag discharge electrode one Air-gap electrostatic leakage passage, wherein electrode plug material are must not in plastics, glass or ceramics, the air gap electrostatic leakage passage Gluing and filling other materials, discharging gap position should be arranged in the place as far as possible away from priming system powder charge, and ensure and powder charge Between have a medium cut-off, the first metallization via (2) of PCB forms circuit company with the first payment to a porter (14) using welding Connect, the second plated through-hole (3) and the second payment to a porter (15) form circuit connection using welding, pass through shell bottling technique or conducting resinl Technique makes the arc pad (6) of PCB be connected with shell formation circuit.

8. high-effect electrostatic protection component according to claim 1, it is characterized in that wafer-type TVS pipe electrostatic protection component Thickness only has 0.8mm~1.5mm.