CN214705596U

CN214705596U - Composite piezoresistor with protection assembly

Info

Publication number: CN214705596U
Application number: CN202121169659.1U
Authority: CN
Inventors: 岳涛; 张琪; 石国能; 冯志巍
Original assignee: Changzhou Tejet Lightning Protection Technology Co ltd
Current assignee: Changzhou Tejet Lightning Protection Technology Co ltd
Priority date: 2021-05-27
Filing date: 2021-05-27
Publication date: 2021-11-12
Anticipated expiration: 2031-05-27

Abstract

The utility model relates to a compound piezoresistor with protection subassembly relates to the field of resistor, and it includes the encapsulated layer and is located the intraformational resistance chip of encapsulation, the relative both sides face fixedly connected with electrode pin of resistance chip, each the one end that resistance chip was kept away from to the electrode pin runs through the encapsulated layer and exposes in the outside of encapsulated layer, still includes the protection subassembly, the protection subassembly is located the outside of encapsulated layer, the protection subassembly includes flexible insulation sleeve, set up on the flexible insulation sleeve and supply the male perforation of electrode pin, the outside at each electrode pin is established to flexible insulation sleeve cover. This application plays the guard action to the electrode pin, and the difficult fracture damage that takes place of electrode pin improves piezo-resistor's job stabilization nature, electric conductivity and explosion-proof.

Description

Composite piezoresistor with protection assembly

Technical Field

The present application relates to the field of resistors, and more particularly, to a composite varistor having a protective component.

Background

The voltage dependent resistor is a resistor device with nonlinear volt-ampere characteristics, and is mainly used for clamping voltage when a circuit bears overvoltage and absorbing redundant current to protect a sensitive device. The resistor material of the piezoresistor is a semiconductor, and the piezoresistor is a voltage-limiting protection device. By utilizing the nonlinear characteristic of the piezoresistor, when overvoltage appears between two poles of the piezoresistor, the piezoresistor can clamp the voltage to a relatively fixed voltage value, thereby realizing the protection of a post-stage circuit.

A related utility model patent publication No. CN203617055U discloses a zinc oxide varistor of composite electrode structure, which includes a body and a lead terminal of the zinc oxide varistor. The zinc oxide piezoresistor body comprises a flaky zinc oxide dielectric chip and a plurality of layers of inner electrodes formed by sequentially sputtering different metals on the front and back surfaces of the flaky zinc oxide dielectric chip, and an epoxy resin encapsulating layer for protecting the body is arranged on the outer surface of the zinc oxide piezoresistor.

In view of the above-mentioned related art, the inventor believes that the electrode pin of the varistor is exposed outside the encapsulating layer, and the electrode pin is easily damaged by being broken due to external force impact.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that the electrode pin is easy to be collided by external force and broken and damaged, the application provides a composite piezoresistor with a protection component.

The composite piezoresistor with the protection component adopts the following technical scheme:

the utility model provides a compound piezoresistor with protection subassembly, includes the encapsulated layer and is located the intraformational resistance chip of encapsulated, the relative both sides face fixedly connected with electrode pin of resistance chip, each electrode pin keep away from the one end of resistance chip and run through the encapsulated layer and extend to the outside of encapsulated layer, still includes the protection subassembly, the protection subassembly is located the outside of encapsulated layer, the protection subassembly includes flexible insulation support, set up on the flexible insulation support and supply the male perforation of electrode pin, the outside at each electrode pin is established to flexible insulation support cover.

Through adopting above-mentioned technical scheme, flexible insulation support is established to the cover on piezoresistor's the electrode pin, plays the guard action to the electrode pin, when piezoresistor when using, takes off flexible insulation support from the electrode pin again, and when the electrode pin received external force collision, flexible insulation support played the cushioning effect to external force impact for the difficult fracture damage that takes place of electrode pin.

Optionally, a connecting plate is fixed on the side of the flexible insulating sleeve close to the flexible insulating sleeve, the two connecting plates are arranged in parallel, and a plurality of connecting sheets are fixedly connected between the two connecting plates.

By adopting the technical scheme, the flexible insulating sleeves sleeved on the two electrode pins are connected into a whole through the connecting plate and the connecting sheet, so that the protection assembly plays a certain supporting and stabilizing role on the electrode pins, and the integrity of the protection assembly is better.

Optionally, the connecting plate and the connecting sheet are both made of flexible insulating materials.

Through adopting above-mentioned technical scheme, because there is the difference in the distance between two electrode pins of the piezo-resistor of different dimensions, consequently, connecting plate and connection piece adopt flexible insulating material for connecting plate and connection piece can carry out tensile deformation, and then make the distance between two flexible insulation support pipe can carry out certain tensile regulation, thereby make this protection subassembly have good suitability to electrode pin.

Optionally, each connecting piece is arranged obliquely relative to the connecting plate, and the connecting pieces are arranged in parallel.

Through adopting above-mentioned technical scheme, the connection piece sets up for the connecting plate slope for this protection subassembly has better deformation space when horizontal tensile extension, makes flexible insulation support can overlap and establish on corresponding electrode pin, thereby this protection subassembly has better suitability to two electrode pins of different distances.

Optionally, a connecting clamping groove is formed in one end face of the connecting plate, a connecting clamping strip matched with the connecting clamping groove is fixed on one end face, opposite to the connecting clamping groove, of the connecting plate, and the axis of the flexible insulating sleeve is perpendicular to the end face where the connecting clamping strip is located.

Through adopting above-mentioned technical scheme, because the length of the piezoresistor's of different dimensions electrode pin is probably different to can overlap on single piezoresistor and establish a plurality of protection subassemblies, carry out comprehensive protection to electrode pin, two adjacent protection subassemblies are connected through connecting card strip and connecting card groove, guarantee the stability of connecting between the adjacent protection subassembly.

Optionally, the resistance chip is provided with an inner electrode block on the side wall near each electrode pin, the electrode pin is connected with the resistance chip through the inner electrode block, the inner electrode block comprises a first electrode coating, an electrode layer and a second electrode coating which are arranged in sequence, and the second electrode coating is attached to the resistance chip.

By adopting the technical scheme, the inner electrode block adopts a composite structure of the first electrode coating, the electrode layer and the second electrode coating, the compactness of the inner electrode block is improved, and the good conductivity of the inner electrode block is ensured.

Optionally, the resistor chip comprises a voltage-sensitive ceramic substrate and a thermal-sensitive ceramic substrate, the voltage-sensitive ceramic substrate and the thermal-sensitive ceramic substrate are fixedly attached to each other, and the voltage-sensitive ceramic substrate and the thermal-sensitive ceramic substrate are electrically connected in series.

By adopting the technical scheme, the voltage-sensitive ceramic substrate and the thermal-sensitive ceramic substrate are compounded together in a series connection mode, and the characteristic that the series connection principle of the capacitor and the interelectrode capacitance of the thermal-sensitive ceramic substrate are small is utilized, so that the interelectrode capacitance of the resistor chip is reduced, and the voltage-sensitive resistor has good overheating and overvoltage protection performance.

Optionally, an accommodating cavity is formed between the encapsulating layer and the resistor chip, and a flame-retardant filling layer is filled in the accommodating cavity.

Through adopting above-mentioned technical scheme, piezoresistor is as surge protection component, and when using, when external surge energy exceeded piezoresistor's endurance capacity, the piezoresistor can be punctured the short circuit, causes local high temperature, and fire-retardant filling layer is difficult for burning for this piezoresistor has good explosion-proof properties.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the protection component is arranged to protect the electrode pins, and when the electrode pins are collided by external force, the flexible insulating sleeve plays a role in buffering the impact of the external force, so that the electrode pins are not easy to break and damage;

2. the compactness of the inner electrode block is improved and the good conductivity of the inner electrode block is ensured by arranging the first electrode coating, the electrode layer and the second electrode coating;

3. by arranging the voltage-sensitive ceramic substrate and the thermal-sensitive ceramic substrate, the interelectrode capacitance of the resistor chip is reduced, so that the voltage-sensitive resistor has good overheat and overvoltage protection performance.

Drawings

Fig. 1 is a schematic structural diagram of a composite varistor with a protection component according to an embodiment of the present application.

Fig. 2 is a sectional view for embodying the internal structure of the varistor in the embodiment of the present application.

Fig. 3 is a schematic view of the overall structure of the protective assembly in the embodiment of the present application.

Description of reference numerals: 1. an encapsulation layer; 11. an accommodating chamber; 2. a resistor chip; 21. a voltage-sensitive ceramic substrate; 22. a thermosensitive ceramic substrate; 3. an inner electrode block; 31. a first electrode plating layer; 32. an electrode layer; 33. a second electrode plating layer; 4. a flame retardant filler layer; 5. a protection component; 51. a connecting plate; 511. a connecting clamping groove; 512. connecting the clamping strips; 52. connecting sheets; 53. a flexible insulating sleeve; 531. perforating; 6. and an electrode pin.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses a composite piezoresistor with a protection component. Referring to fig. 1 and 2, a composite varistor with a protective component includes an encapsulation layer 1, a resistance chip 2, and a protective component 5, where the resistance chip 2 is located in the encapsulation layer 1. The two opposite side surfaces of the resistor chip 2 are connected with electrode pins 6, and one end of each electrode pin 6, which is far away from the resistor chip 2, penetrates through the encapsulating layer 1 and is exposed outside the encapsulating layer 1. The protection component 5 is located outside the encapsulation layer 1, and the protection component 5 is mounted on the electrode pin 6 and used for protecting the electrode pin 6 so that the electrode pin 6 is not easy to break.

Referring to fig. 1 and 2, the encapsulating layer 1 may be made of an epoxy resin material, or a silicone resin material, as long as it can perform good moisture-proof and insulation protection functions, and in this embodiment, the encapsulating layer 1 is made of an epoxy resin. An accommodating cavity 11 is formed between the encapsulating layer 1 and the resistance chip 2, and the accommodating cavity 11 is filled with a flame-retardant filling layer 4. In this embodiment, the flame-retardant filling layer 4 is made of aluminum silicate fiber. When the piezoresistor is broken down and short-circuited, the flame-retardant filling layer 4 is not easy to burn due to local high temperature, so that the piezoresistor has good explosion-proof performance.

Referring to fig. 1 and 2, the resistor chip 2 includes a voltage-sensitive ceramic substrate 21 and a thermal-sensitive ceramic substrate 22, the voltage-sensitive ceramic substrate 21 is attached to one side of the thermal-sensitive ceramic substrate 22, the voltage-sensitive ceramic substrate 21 and the thermal-sensitive ceramic substrate 22 are fixedly connected through a current-carrying welding process, and the voltage-sensitive ceramic substrate 21 and the thermal-sensitive ceramic substrate 22 are electrically connected in series. The interelectrode capacitance of the resistance chip 2 is reduced by utilizing the series connection principle of the capacitance and the characteristic that the interelectrode capacitance of the thermal sensitive ceramic substrate 22 is small, so that the piezoresistor has good protection performances of overheating, overvoltage and the like.

Referring to fig. 1 and 2, the inner electrode block 3 is welded on the side wall of the resistor chip 2 close to each electrode pin 6, and one end of each electrode pin 6 is welded and fixed with one surface of the inner electrode block 3 far away from the resistor chip 2. The inner electrode block 3 comprises a first electrode coating 31, an electrode layer 32 and a second electrode coating 33, the first electrode coating 31, the electrode layer 32 and the second electrode coating 33 are sequentially arranged in the direction close to the resistance chip 2, the electrode layer 32 is made of copper metal, the first electrode coating 31 and the second electrode coating 33 are silver powder coatings, the silver powder coatings are compounded on the outer wall of the electrode layer 32 through a cold spraying process, the compactness of the inner electrode block 3 is improved, and the good conductivity of the inner electrode block 3 is guaranteed.

Referring to fig. 1 and 3, the protection assembly 5 is made of rubber, the protection assembly 5 includes a flexible insulating sleeve 53 and a connection plate 51, and the flexible insulating sleeve 53 and the connection plate 51 are provided in two and correspond to each electrode pin 6. The flexible insulating sleeve 53 is provided with a through hole 531 for inserting the electrode pin 6, each flexible insulating sleeve 53 is sleeved on the electrode pin 6 through the through hole 531, and when the flexible insulating sleeve 53 is in a natural state, the diameter of the through hole 531 is smaller than that of the electrode pin 6, so that the flexible insulating sleeve 53 is elastically held tightly on the electrode pin 6, and the connection stability between the flexible insulating sleeve 53 and the electrode pin 6 is ensured.

Referring to fig. 1 and 3, the connecting plates 51 are integrally formed on the peripheral sides of the corresponding flexible insulating sleeves 53, the two connecting plates 51 are parallel to each other, a plurality of connecting pieces 52 are fixed between the two connecting plates 51, and the connecting pieces 52 and the connecting plates 51 are made of flexible insulating materials. Each connecting piece 52 is obliquely arranged relative to the connecting plate 51, and the connecting pieces 52 are parallel to each other, so that the protective component 5 has better deformation and elongation space when being stretched and expanded in the transverse direction. The end face of the connecting plate 51 close to the encapsulating layer 1 is provided with a connecting clamping groove 511, and the cross section of the connecting clamping groove 511 is arc-shaped. The end face, far away from the encapsulating layer 1, of the connecting plate 51 is provided with a connecting clamping strip 512 matched with the connecting clamping groove 511, so that the electrode pins 6 can be protected by installing a proper number of protection assemblies 5 on the electrode pins 6 according to the length of the electrode pins 6, two adjacent protection assemblies 5 are connected through the connecting clamping strip 512 and the connecting clamping groove 511, and the connection stability between the adjacent protection assemblies 5 is guaranteed.

The implementation principle of the composite piezoresistor with the protection component in the embodiment of the application is as follows: when the protection component 5 is mounted on the electrode pins 6, the distance between the two flexible insulation sleeves 53 is adjusted through the connecting plate 51 and the connecting sheet 52, so that the through holes 531 are aligned with the electrode pins 6, the flexible insulation sleeves 53 are sleeved on the electrode pins 6, and a proper number of protection components 5 are sequentially sleeved according to the lengths of the electrode pins 6 to protect the electrode pins 6. When the piezoresistor is used, the flexible insulating sleeve 53 is taken down from the electrode pin 6, and when the electrode pin 6 is collided by external force, the flexible insulating sleeve 53 has a buffering effect on the external force impact, so that the electrode pin 6 is not easy to break and damage.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a compound piezoresistor with protection subassembly, includes encapsulated layer (1) and is located resistance chip (2) in encapsulated layer (1), the relative both sides face fixedly connected with electrode pin (6) of resistance chip (2), each one end that resistance chip (2) are kept away from in electrode pin (6) runs through encapsulated layer (1) and extends to the outside of encapsulated layer (1), its characterized in that: the electrode pin structure is characterized by further comprising a protection assembly (5), wherein the protection assembly (5) is located outside the encapsulating layer (1), the protection assembly (5) comprises a flexible insulating sleeve (53), a through hole (531) for inserting the electrode pin (6) is formed in the flexible insulating sleeve (53), and the flexible insulating sleeve (53) is sleeved outside each electrode pin (6).

2. A composite varistor with protective component according to claim 1, characterized in that: each flexible insulating sleeve (53) is fixed with connecting plate (51) on the week side that is close to each other, two connecting plate (51) parallel arrangement each other, two fixedly connected with a plurality of connection pieces (52) between connecting plate (51).

3. A composite varistor with protective component according to claim 2, characterized in that: the connecting plate (51) and the connecting sheet (52) are both made of flexible insulating materials.

4. A composite varistor with protective component according to claim 3, characterized in that: each connecting piece (52) is obliquely arranged relative to the connecting plate (51), and a plurality of connecting pieces (52) are arranged in parallel.

5. The composite varistor with protection component of claim 4, wherein: a connecting clamping groove (511) is formed in one end face of the connecting plate (51), a connecting clamping strip (512) matched with the connecting clamping groove (511) is fixed on one end face, opposite to the connecting clamping groove (511), of the connecting plate (51), and the axis of the flexible insulating sleeve (53) is perpendicular to the end face where the connecting clamping strip (512) is located.

6. A composite varistor with protective component according to claim 1, characterized in that: resistance chip (2) are close to on the lateral wall of each electrode pin (6) fixed inner electrode piece (3) that is provided with, electrode pin (6) are connected with resistance chip (2) through inner electrode piece (3), inner electrode piece (3) are including first electrode cladding material (31), electrode layer (32) and second electrode cladding material (33) that set gradually, second electrode cladding material (33) set up with the laminating of resistance chip (2).

7. A composite varistor with protective component according to claim 1, characterized in that: resistance chip (2) include voltage-sensitive ceramic substrate (21) and thermal-sensitive ceramic substrate (22), it is fixed to laminate between voltage-sensitive ceramic substrate (21) and the thermal-sensitive ceramic substrate (22), the electric property is established ties between voltage-sensitive ceramic substrate (21) and the thermal-sensitive ceramic substrate (22).

8. A composite varistor with protective component according to claim 1, characterized in that: an accommodating cavity (11) is formed between the encapsulating layer (1) and the resistance chip (2), and a flame-retardant filling layer (4) is filled in the accommodating cavity (11).