CN114124064B - A kind of photoconductive switch packaging structure - Google Patents

Abstract

The invention relates to a photoconductive switch packaging structure which comprises a transverse cylindrical conductive shell with two open ends, wherein the opening at the left end of the conductive shell is sealed by a light-transmitting sheet, a conductive circular ring sheet is arranged in the middle of the conductive shell, an insulating circular ring sheet is sealed and blocked at the right end of the conductive shell, and a conductive rod transversely penetrates through the center of the insulating circular ring sheet. The beneficial effects of the invention are as follows: the inside of the conductive shell can form a sealed space through the detachable assembly, and two electrodes of the photoconductive switch are respectively connected with the conductive annular sheet so as to be further connected with the conductive shell and the conductive rod to be directly led out, thereby realizing the electric connection between the photoconductive switch and an external circuit. And the transparent insulating medium is filled in the sealed space, so that the transparent insulating medium completely wraps the periphery of the photoconductive switch, and the compressive strength and the service life of the photoconductive switch are improved.

Description

A kind of photoconductive switch packaging structure

Technical field

The invention relates to a photoconductive switch packaging structure.

Background technique

The photoconductive switch is a new type of ultra-fast semiconductor electronic device. It is a key device for generating high-power ultra-short pulses. The conductivity of the semiconductor material is controlled by laser triggering to turn the switch on and off. Compared with switches in the traditional pulse power field, photoconductive switches have fast closing time (ps level), small jitter time (ps level), low switching inductance (sub-nH level), high repetition frequency, and are not subject to electromagnetic interference. , light weight, small size and other advantages, it can work at ultra-high repetition frequency with ultra-high power capacity. The packaging structure is crucial for high-voltage switching devices and can protect the device. However, it is difficult for the current photoconductive switch packaging structure to ensure the stability and reliability in a high-voltage and high-current working environment.

Contents of the invention

In order to solve the above technical deficiencies, the present invention provides a photoconductive switch packaging structure, which achieves comprehensive protection for the photoconductive switch and improves the service life of the photoconductive switch and the operating voltage of the entire device.

The present invention is achieved through the following measures:

A photoconductive switch packaging structure, including a transverse cylindrical conductive housing with openings at both ends. The left end opening of the conductive housing is sealed with a light-transmitting sheet, and a conductive annular sheet is provided in the middle of the conductive housing. The outer circumferential surface of the annular ring sheet is in close contact with the inner circumferential surface of the conductive housing. There is a through hole in the center of the conductive annular sheet. The right end opening of the conductive housing is sealed with an insulating annular sheet. The center of the insulating annular sheet is sealed. A conductive rod is pierced transversely. The left end of the conductive rod passes through the through hole and there is a gap between the outer surface of the conductive rod and the inner surface of the through hole. A photoconductive switch chip is provided in the gap. There are two photoconductive switch chips. The electrodes are respectively connected to the conductive annular sheet and the conductive rod. The right end of the conductive rod extends to the right side of the insulating annular sheet. There is a gap between the conductive annular sheet and the light-transmitting sheet, around the photoconductive switch chip, and between the conductive annular sheet and the insulation. The conductive shell between the annular sheets is filled with transparent insulating medium.

There is a cap on the outside of the above-mentioned light-transmitting sheet. The edge of the cap is buckled on the outside of the end of the conductive housing and connected together through threads. There is an observation window in the center of the end of the conductive housing. The light-transmitting sheet and the opening around the left end of the conductive housing are A sealing ring is provided between the end faces.

The above-mentioned insulating ring sheet has an injection hole, and a removable blocking screw is inserted into the injection hole. The end surface on the right side of the insulating ring sheet is coated with an insulating curing glue layer.

The inner circumferential surface of the above-mentioned conductive housing is provided with threads, and the outer circumferential surface of the conductive annular piece and the outer circumferential surface of the insulating annular piece are connected with the inner circumferential surface of the conductive housing through threads.

An annular groove is formed on the end surface around the left end opening of the conductive housing. The sealing ring is embedded in the groove, and the thickness of the sealing ring is greater than the depth of the groove.

The above-mentioned transparent insulating medium uses transparent insulating gas or transparent insulating liquid. The conductive shell, conductive ring sheet and conductive rod are made of pure copper material. The insulating ring sheet is made of materials with certain strength and good insulation properties. The light-transmitting sheet is made of highly transparent material. Light optical glass.

Preferably, the insulating annular sheet is made of AlN ceramic or polytetrafluoroethylene insulating materials.

The technical features and advantages of the present invention are as follows:

A sealed space can be formed inside the conductive shell through a detachable assembly. The two electrodes of the photoconductive switch are respectively connected to the conductive ring piece and then connected to the conductive shell and the conductive rod to be directly led out, thereby realizing the electrical connection between the photoconductive switch and the external circuit. The transparent insulating medium is filled into the sealed space so that the transparent insulating medium completely wraps around the photoconductive switch, thereby improving the pressure strength and service life of the photoconductive switch.

Description of the drawings

Figure 1 is a schematic front view of the structure of the present invention;

In the picture: 1. Cap; 2. Transparent sheet; 3. Sealing ring; 4. Photoconductive switch chip; 5. Conductive ring piece; 6. Conductive shell; 7. Insulating ring piece; 8. Blocking screws; 9. Conductive rod; 10. Transparent insulating medium; 11. Insulating cured adhesive layer.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings:

As shown in Figure 1, a photoconductive switch packaging structure includes a transverse cylindrical conductive housing 6 with openings at both ends. The left end opening of the conductive housing 6 is sealed with a light-transmitting sheet 2. Inside the conductive housing 6 There is a conductive annular sheet 5 in the middle. The outer circumferential surface of the conductive annular sheet 5 closely fits the inner circumferential surface of the conductive shell 6. There is a through hole in the center of the conductive annular sheet 5, and the right end opening of the conductive shell 6 is sealed. An insulating annular sheet 7 is blocked, and a conductive rod 9 is transversely pierced through the center of the insulating annular sheet 7. The left end of the conductive rod 9 penetrates through the through hole, and there is a gap between the outer surface of the conductive rod 9 and the inner surface of the through hole, so A photoconductive switch chip 4 is provided at the gap. The two electrodes of the photoconductive switch chip 4 are respectively connected to the conductive annular sheet 5 and the conductive rod 9. The right end of the conductive rod 9 extends to the right side of the insulating annular sheet 7. The conductive annular ring The conductive shell 6 between the sheet 5 and the light-transmitting sheet 2, the space around the photoconductive switch chip 4, and the conductive annular sheet 5 and the insulating annular sheet 7 are filled with transparent insulating medium 10. The photoconductive switch chip 4 has a coplanar electrode design and a back-emission laser triggering mode. One electrode of the photoconductive switch chip 4 is welded to the conductive annular sheet 5 and then combined with the conductive shell 6 through threads, and the photoconductive switch chip 4 The other electrode is welded to the conductive rod 9, so that two lead-out ends can be obtained for electrical connection respectively. The conductive annular sheet 5 and the conductive rod 9 are welded to the electrodes of the photoconductive switch chip 4 successively through welding. The transparent insulating medium 10 is filled into the sealed space so that the transparent insulating medium 10 completely wraps around the photoconductive switch, thereby improving the service life of the photoconductive switch and the working voltage of the entire device.

There is a cap 1 on the outside of the light-transmitting sheet 2. The edge of the cap 1 is buckled on the outside of the end of the conductive housing 6 and connected together through threads. There is an observation window in the center of the end of the conductive housing 6. The light-transmitting sheet 2 and the conductive housing 6 A sealing ring 3 is provided between the end faces around the left end opening. In order to improve the sealing performance, an annular groove is formed on the end surface around the left end opening of the conductive housing 6, and the sealing ring 3 is embedded in the groove. The cap 1 has a window, which can be combined with the light-transmitting sheet 2 to form a light-transmitting sealing window; the cap 1 can be tightened with the end of the conductive housing 6 that has an external thread, and through the close contact between the light-transmitting sheet 2 and the sealing ring 3, The port has good sealing effect. The material of the light-transmitting sheet 2 can be a highly transparent optical glass sheet, and the glass sheet can be coated for different laser wavelengths.

The insulating ring piece 7 has an injection hole, and a removable blocking screw 8 is inserted into the injection hole. The end surface on the right side of the insulating ring piece 7 is coated with an insulating curing glue layer 11. The inner circumferential surface of the conductive housing 6 is provided with threads, and the outer circumferential surface of the conductive annular sheet 5 and the outer circumferential surface of the insulating annular sheet 7 are both connected to the inner circumferential surface of the conductive housing 6 through threads. There are gaps on the conductive annular sheet 5 that are larger than the size of the photoconductive switch chip 4 to facilitate the circulation of the transparent insulating medium 10 and the screwing-in and unscrewing of the conductive annular sheet 5 in the conductive housing 6 . The size of the central through hole of the insulating ring plate 7 is consistent with the size of the bottom surface of the conductive rod 9. The conductive rod 9 and the insulating ring plate 7 can be positioned relative to each other by designing corresponding threads or using solidified materials such as sealant. Fixing and sealing, thereby moving the position of the insulating ring piece 7 in the housing to control the position of the conductive rod 9 to achieve good welding. The insulating ring sheet 7 also has a threaded hole with a length equal to the wall thickness, where the transparent insulating medium 10 can be filled. After the filling is completed, it can be sealed with screws first, and then the insulating curing medium is used to seal the insulating ring sheet 7 The outer surface is cured. The insulating ring piece 7 and the conductive rod 9 can be integrally formed through threads or sealant.

The cap 1, the conductive shell 6, the conductive ring piece 5, and the conductive rod 9 are all made of pure copper materials. Among them, pure copper is also called red copper, which refers to the copper with the highest copper content, ranging from 99.5% to 99.95%. It has good weldability, plasticity, corrosion resistance and excellent conductive properties.

The insulating ring piece 7 can be made of AlN ceramics, polytetrafluoroethylene materials and other insulating materials. Among them, the light-transmitting sheet 2 is a highly transparent optical glass sheet that can be coated for different laser wavelengths. The blocking screws 8 can be metal screws or plastic screws. The sealing ring 3 can be made of fluorine rubber, rubber, silicone or other materials. The insulating curing glue can be epoxy resin glue, etc. The transparent insulating medium 10 may be a transparent insulating material such as a transparent insulating gas or a transparent insulating liquid. Sulfur hexafluoride can be used as the transparent insulating gas; fluorinated liquid, liquid silicone or insulating oil can be used as the insulating liquid.

The above are only the preferred embodiments of this patent. It should be pointed out that those of ordinary skill in the art can also make several improvements and substitutions without departing from the technical principles of this patent. These improvements and substitutions It should also be regarded as the protection scope of this patent.

Claims (6)

1. A photoconductive switch packaging structure, characterized in that: it includes a transverse cylindrical conductive housing with openings at both ends. The left end opening of the conductive housing is sealed with a light-transmitting sheet, and a conductive circle is provided in the middle of the conductive housing. Ring piece, the outer circumferential surface of the conductive annular piece closely fits the inner circumferential surface of the conductive shell, a through hole is opened in the center of the conductive annular piece, and the right end opening of the conductive shell is sealed with an insulating annular piece, so A conductive rod is transversely pierced through the center of the insulating ring sheet. The left end of the conductive rod penetrates through the through hole and there is a gap between the outer surface of the conductive rod and the inner surface of the through hole. A photoconductive switch chip is provided in the gap. The two electrodes of the photoconductive switch chip are respectively connected to the conductive annular sheet and the conductive rod. The right end of the conductive rod extends to the right side of the insulating annular sheet. There is a gap between the conductive annular sheet and the light-transmitting sheet and around the photoconductive switch chip. The conductive shell between the conductive ring piece and the insulating ring piece is filled with transparent insulating medium. 2. The photoconductive switch packaging structure according to claim 1, characterized in that: a cap is placed on the outside of the light-transmitting sheet, and the edge of the cap is buckled on the outside of the end of the conductive housing and connected together through threads, and the ends of the conductive housing are There is an observation window in the center of the housing, and a sealing ring is provided between the light-transmitting sheet and the end surface around the left end opening of the conductive housing. 3. The photoconductive switch packaging structure according to claim 1, characterized in that: the insulating annular sheet is provided with an injection hole, and a detachable blocking screw is inserted into the injection hole. The end surface of the right side of the insulating annular sheet Coated with insulating cured adhesive layer. 4. The photoconductive switch packaging structure according to claim 1, characterized in that: the inner circumferential surface of the conductive housing is provided with threads, and the outer circumferential surface of the conductive annular sheet and the outer circumferential surface of the insulating annular sheet are both in contact with the conductive shell. The inner circumferential surface of the body is connected by threads. 5. The optical switch packaging structure according to claim 2, characterized in that: an annular groove is formed on the end surface around the left end opening of the conductive housing, and the sealing ring is embedded in the groove to achieve sealing. Effect. 6. The photoconductive switch packaging structure according to claim 1, characterized in that: the transparent insulating medium can be transparent insulating gas, insulating liquid or insulating glue, etc., and the conductive shell, conductive ring sheet, and conductive rod can be made of pure copper , titanium gold and other metal conductive materials, the insulating ring sheet can be made of AlN ceramics, polytetrafluoroethylene and other insulating materials, and the light-transmitting sheet is made of high-transmissive optical glass.