CN210245194U - Piezoresistor with protection component - Google Patents
Piezoresistor with protection component Download PDFInfo
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- CN210245194U CN210245194U CN201921033626.7U CN201921033626U CN210245194U CN 210245194 U CN210245194 U CN 210245194U CN 201921033626 U CN201921033626 U CN 201921033626U CN 210245194 U CN210245194 U CN 210245194U
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- piezoresistor
- elastic pressing
- chip
- conductive particles
- piece
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Abstract
The utility model provides a piezoresistor with protection component, two electrodes of the piezoresistor chip are respectively electrically connected with two electrode plates, an elastic pressing piece, conductive particles and a contraction driving piece are also arranged in an insulating shell, the elastic pressing piece is arranged at the outer side of the piezoresistor chip, the conductive particles are filled in a cavity between the piezoresistor chip and the elastic pressing piece, two sides of the elastic pressing piece are provided with inwards bent pressing tongues, the opening end of the elastic pressing piece is provided with the contraction driving piece, two sides of the contraction driving piece are extended with bent clamping plates, the end parts of the clamping plates are pressed on the outer wall of the pressing tongues, the pressing tongues contract inwards under the action of the clamping plates, when the piezoresistor chip begins to deteriorate, the conductive particles are pressed into an insulating coating under the extrusion action of the pressing tongues to contact with the two electrode plates, and the conductive particles are closely arranged to form a conductive path, the current flowing through the piezoresistor chip is shunted, and the overheating protection of the piezoresistor chip can be realized.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to a basic electronic component's technical field, especially a piezo-resistor with protection component.
[ background of the invention ]
The voltage dependent resistor is a voltage limiting type protection device, has strong surge absorption capacity and is widely applied to electronic circuits. The voltage clamping is carried out when overvoltage is carried out by mainly utilizing the nonlinear characteristic of the piezoresistor, and redundant current is absorbed, so that the protection of a post-stage circuit is realized. The piezoresistor can be gradually degraded along with the increase of the surge absorption times, so that the current flowing through the piezoresistor is continuously increased, the temperature is continuously increased, and finally, the product can explode or catch fire.
In order to avoid serious consequences caused by the deterioration of the piezoresistor, the piezoresistor needs to be protected from overheating, and at present, two main ways exist: one is TMOV, such as a varistor with an alloy type thermal fuse; one is a thermal trip type varistor. The varistor is disconnected from the circuit by melting the thermal fuse/trip point by heat generated when the varistor is deteriorated. However, since the piezoresistor is connected in parallel at two ends of the protected circuit, the piezoresistor is not easy to be perceived by a user after being disconnected from the circuit due to degradation, and the surge can be continuously transmitted to the protected circuit, so that equipment is damaged or other faults are caused, and potential safety hazards exist.
[ Utility model ] content
The utility model aims at solving the problem among the prior art, providing a piezo-resistor with protection component, can realize avoiding equipment to damage and causing the potential safety hazard to the overheat protection of piezo-resistor chip.
In order to achieve the above object, the present invention provides a varistor with a protection component, comprising a varistor chip, two electrodes, an insulating coating, and an insulating casing, wherein the two electrodes of the varistor chip are electrically connected to the two electrodes, the connection part of the varistor chip, the electrodes, and the varistor chip is wrapped by the insulating coating, the insulating casing is further provided with an elastic pressing member, conductive particles, and a contraction driving member, the elastic pressing member is disposed outside the varistor chip, the cavity between the varistor chip and the elastic pressing member is filled with the conductive particles, the two sides of the elastic pressing member are provided with inward-bent pressing tongues, the opening end of the elastic pressing member is provided with the contraction driving member, the two sides of the contraction driving member extend to form a bent clamping plate, and the end of the clamping plate is pressed against the outer wall of the pressing tongues, the pressing tongue shrinks inwards under the action of the clamping plate, when the piezoresistor chip begins to deteriorate, the insulating coating is melted and softened by the generated heat, the conductive particles are pressed into the insulating coating under the extrusion action of the pressing tongue to be contacted with the two electrode plates, the conductive particles are tightly arranged to form a conductive path, and the current flowing through the piezoresistor chip is shunted.
Preferably, the elastic pressing piece is a U-shaped frame body, the elastic pressing piece is composed of a bottom frame and side blocking frames arranged on two sides of the bottom frame, an arc transition is arranged at the joint of the bottom frame and the side blocking frames, a first through groove is formed in each side blocking frame, and a pressing tongue bent inwards is arranged in each first through groove.
Preferably, the opening end of the side blocking frame contracts inwards, the clamping plate is clamped on the outer side of the side blocking frame, and the opening end of the clamping plate expands outwards.
Preferably, the shape of the contraction driving piece is in an inverted U shape, the contraction driving piece is composed of a top frame and clamping plates arranged on two sides of the top frame, a second through groove is formed in the top frame, and the free end of the electrode plate penetrates through the second through groove.
Preferably, the end part of the clamping plate is provided with a clamping pin protruding inwards, the free end of the clamping pin is provided with an arc-shaped leading-in part, and the other end of the clamping pin and the inner wall of the clamping plate form a stepped clamping groove in front.
Preferably, the conductive particles are spherical in shape.
The utility model has the advantages that: the utility model discloses a short circuit reposition of redundant personnel method realizes the overheat protection to the piezo-resistor chip. The insulating coating is compact under normal conditions, so that the connecting electrode is insulated from the protection device, and the normal working performance of the piezoresistor is not influenced. When the piezoresistor is degraded in the using process, the internal current of the piezoresistor is continuously increased, the temperature is continuously increased, when the temperature reaches the glass transition temperature of the insulating coating material, the insulating coating is changed into a molten state from a compact state, a conductive path formed by conductive particles is contacted with an internal connecting electrode under the action of the elastic pressing piece and the contraction driving piece, and the current is shunted through the short circuit of the conductive path, so that the current flowing through the piezoresistor is reduced, and the accidents such as fire disasters and the like caused by overhigh temperature are avoided. The surge current is released due to the existence of the short-circuit shunt path, the rear end of the short-circuit shunt path is not influenced by the protection circuit, and the short-circuit current is easily detected by devices such as a current fuse and the like at the front end, so that the power supply of the whole equipment can be cut off in time, and further damage is avoided.
The features and advantages of the present invention will be described in detail by embodiments with reference to the accompanying drawings.
[ description of the drawings ]
Fig. 1 is a schematic cross-sectional structure diagram of a varistor with a protection assembly according to the present invention;
fig. 2 is an enlarged schematic view of a varistor of the present invention with a protective assembly at a point a;
fig. 3 is a schematic cross-sectional view of an elastic pressing member of the varistor with the protection component according to the present invention;
fig. 4 is a schematic cross-sectional view of a retraction actuator for a varistor with a guard assembly according to the present invention.
[ detailed description ] embodiments
Referring to fig. 1 to 4, the varistor with protection component of the present invention includes a varistor chip 1, electrode plates 2, an insulating coating 3, and an insulating casing 4, wherein two electrodes of the varistor chip 1 are electrically connected to the two electrode plates 2, respectively, the connecting portions of the varistor chip 1, the electrode plates 2, and the varistor chip 1 are wrapped by the insulating coating 3, the insulating casing 4 is further provided with an elastic pressing member 5, conductive particles 6, and a shrinkage driving member 7, the elastic pressing member 5 is disposed at the outer side of the varistor chip 1, a cavity between the varistor chip 1 and the elastic pressing member 5 is filled with the conductive particles 6, two sides of the elastic pressing member 5 are provided with pressing tongues 512 bending inward, the open end of the elastic pressing member 5 is provided with the shrinkage driving member 7, two sides of the shrinkage driving member 7 are extended with bending clamping plates 72, the end of the clamping plate 72 is pressed against the outer wall of the pressing tongue 512, the pressing tongue 512 contracts inwards under the action of the clamping plate 72, when the piezoresistor chip 1 begins to deteriorate, the insulating coating 3 is melted and softened by the generated heat, the conductive particles 6 are pressed into the insulating coating 3 under the extrusion action of the pressing tongue 512 to be contacted with the two electrode plates 2, and the conductive particles 6 are tightly arranged to form a conductive path to shunt the current flowing through the piezoresistor chip 1. The conductive particles 6 are spherical in shape.
Furthermore, the elastic pressing member 5 is a U-shaped frame body, the elastic pressing member 5 is composed of a bottom frame 52 and side blocking frames 51 arranged on two sides of the bottom frame 52, an arc transition 521 is arranged at the joint of the bottom frame 52 and the side blocking frames 51, a first through groove 511 is formed in the side blocking frames 51, and a pressing tongue 512 bent inwards is arranged in the first through groove 511. The opening end of the side blocking frame 51 is contracted inwards, the clamping plate 72 is clamped on the outer side of the side blocking frame 51, and the opening end of the clamping plate 72 is expanded outwards.
Furthermore, the shape of the retractable driving member 7 is an inverted U-shape, the retractable driving member 7 is composed of a top frame 71 and clamping plates 72 arranged on two sides of the top frame 71, a second through groove 711 is formed in the top frame 71, and the free end of the electrode plate 2 penetrates through the second through groove 711. The end of the snap-gauge 72 is provided with a snap-gauge 721 protruding inwards, the free end of the snap-gauge 721 is provided with an arc-shaped lead-in portion 722, and a stepped snap-in groove 723 is formed between the other end of the snap-gauge 721 and the inner wall of the snap-gauge 72.
The utility model discloses the working process:
the utility model relates to a piezo-resistor with protection component adopts the short circuit reposition of redundant personnel method to realize the overheat protection to the piezo-resistor chip. The insulating coating is compact under normal conditions, so that the connecting electrode is insulated from the protection device, and the normal working performance of the piezoresistor is not influenced. When the piezoresistor is degraded in the using process, the internal current of the piezoresistor is continuously increased, the temperature is continuously increased, when the temperature reaches the glass transition temperature of the insulating coating material, the insulating coating is changed into a molten state from a compact state, a conductive path formed by conductive particles is contacted with an internal connecting electrode under the action of the elastic pressing piece and the contraction driving piece, and the current is shunted through the short circuit of the conductive path, so that the current flowing through the piezoresistor is reduced, and the accidents such as fire disasters and the like caused by overhigh temperature are avoided. The surge current is released due to the existence of the short-circuit shunt path, the rear end of the short-circuit shunt path is not influenced by the protection circuit, and the short-circuit current is easily detected by devices such as a current fuse and the like at the front end, so that the power supply of the whole equipment can be cut off in time, and further damage is avoided.
The structure that the shrinkage driving piece is matched with the elastic pressing piece is adopted, the pressing tongue can be guaranteed to be pressed against conductive particles in a cavity between the elastic pressing piece and the piezoresistor all the time, when a piezoresistor chip begins to deteriorate, the insulating coating is melted and softened by generated heat, the conductive particles are pressed into the insulating coating under the extrusion action of the pressing tongue to be contacted with the two electrode plates, the conductive particles are closely arranged to form a conductive path, and current flowing through the piezoresistor chip is shunted.
The above-mentioned embodiment is right the utility model discloses an explanation, it is not right the utility model discloses a limited, any right the scheme after the simple transform of the utility model all belongs to the protection scope of the utility model.
Claims (6)
1. The utility model provides a piezo-resistor with protection component, includes piezo-resistor chip (1), electrode slice (2), insulating coating (3), insulating casing (4), two electrodes and two electrode slices (2) electric connection respectively of piezo-resistor chip (1), the coupling part of piezo-resistor chip (1), electrode slice (2) and piezo-resistor chip (1) wraps up its characterized in that through insulating coating (3): the insulation structure is characterized in that an elastic pressing piece (5), conductive particles (6) and a contraction driving piece (7) are further arranged in the insulation shell (4), the elastic pressing piece (5) is arranged on the outer side of the piezoresistor chip (1), the conductive particles (6) are filled in a cavity between the piezoresistor chip (1) and the elastic pressing piece (5), pressing tongues (512) which are bent inwards are arranged on two sides of the elastic pressing piece (5), the contraction driving piece (7) is installed at the opening end of the elastic pressing piece (5), bent clamping plates (72) extend from two sides of the contraction driving piece (7), the end portions of the clamping plates (72) are pressed against the outer walls of the pressing tongues (512), the pressing tongues (512) contract inwards under the action of the clamping plates (72), when the piezoresistor chip (1) begins to deteriorate, the insulation coating (3) is melted and softened by the generated heat, and the conductive particles (6) are pressed into the insulation coating (3) and the two electrodes under the extrusion action of the pressing tongues (512) The sheets (2) are in contact, and the conductive particles (6) are closely arranged to form a conductive path to shunt current flowing through the piezoresistor chip (1).
2. The varistor of claim 1, wherein: the elastic pressing piece (5) is a U-shaped frame body, the elastic pressing piece (5) is composed of a bottom frame (52) and side blocking frames (51) arranged on two sides of the bottom frame (52), an arc transition (521) is arranged at the joint of the bottom frame (52) and the side blocking frames (51), a first through groove (511) is formed in each side blocking frame (51), and a pressing tongue (512) bent inwards is arranged in each first through groove (511).
3. The varistor of claim 2, wherein: the opening end of the side blocking frame (51) is retracted inwards, the clamping plate (72) is clamped on the outer side of the side blocking frame (51), and the opening end of the clamping plate (72) is expanded outwards.
4. The varistor of claim 1, wherein: the electrode plate is characterized in that the shrinkage driving part (7) is in an inverted U shape, the shrinkage driving part (7) is composed of a top frame (71) and clamping plates (72) arranged on two sides of the top frame (71), a second through groove (711) is formed in the top frame (71), and the free end of the electrode plate (2) penetrates through the second through groove (711).
5. The varistor of claim 2, wherein: the end part of the clamping plate (72) is provided with a clamping pin (721) protruding inwards, the free end of the clamping pin (721) is provided with an arc-shaped leading-in part (722), and a stepped clamping groove (723) is formed in front of the other end of the clamping pin (721) and the inner wall of the clamping plate (72).
6. The varistor of claim 1, wherein: the conductive particles (6) are spherical in shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921033626.7U CN210245194U (en) | 2019-07-04 | 2019-07-04 | Piezoresistor with protection component |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921033626.7U CN210245194U (en) | 2019-07-04 | 2019-07-04 | Piezoresistor with protection component |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210245194U true CN210245194U (en) | 2020-04-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921033626.7U Expired - Fee Related CN210245194U (en) | 2019-07-04 | 2019-07-04 | Piezoresistor with protection component |
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| Country | Link |
|---|---|
| CN (1) | CN210245194U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111564270A (en) * | 2020-06-12 | 2020-08-21 | 安徽航睿电子科技有限公司 | Stable thermistor |
-
2019
- 2019-07-04 CN CN201921033626.7U patent/CN210245194U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111564270A (en) * | 2020-06-12 | 2020-08-21 | 安徽航睿电子科技有限公司 | Stable thermistor |
| CN111564270B (en) * | 2020-06-12 | 2022-01-11 | 安徽徽宁电器仪表集团有限公司 | Stable thermistor |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200403 Termination date: 20210704 |