CN216287811U

CN216287811U - Piezoresistor with double-sided thermal protection

Info

Publication number: CN216287811U
Application number: CN202122568022.6U
Authority: CN
Inventors: 孙日光
Original assignee: Huizhou Chuangde Lightning Protection Electronics Co ltd
Current assignee: Huizhou Chuangde Lightning Protection Electronics Co ltd
Priority date: 2021-10-25
Filing date: 2021-10-25
Publication date: 2022-04-12
Anticipated expiration: 2031-10-25

Abstract

The utility model discloses a piezoresistor with double-sided thermal protection. The varistor has double-sided thermal protection, the fuse can absorb heat generated by the varistor body and the electrode, the fuse is fused when the temperature of the varistor body reaches or exceeds a certain upper limit value, a circuit can be cut off in time, continuous temperature rise is avoided, the inner part of the filling dielectric layer contains a fire retardant, rapid combustion or rupture can be avoided at high temperature, potential safety hazards are reduced, repair is facilitated, the over-temperature protector can conduct high heat under the condition that continuous high voltage applied to the varistor within a certain time causes overheating, the resistor and the whole circuit are protected, and potential safety hazards are reduced.

Description

Piezoresistor with double-sided thermal protection

Technical Field

The utility model relates to the technical field of resistors, in particular to a piezoresistor with double-sided thermal protection.

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 English name is called "Voltage Dependent Resistor" which is abbreviated as "VDR", or "Varistor". The resistor material of the varistor is a semiconductor, so it is one of the semiconductor resistors. The piezoresistor is a voltage-limiting type 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. The main parameters of the varistor are: voltage dependent voltage, current capacity, junction capacitance, response time, etc. The varistor is characterized in that when the voltage applied to it is lower than its threshold value "UN", the current flowing through it is very small, corresponding to a dead valve, and when the voltage exceeds UN, its resistance value becomes small, thus the current flowing through it increases sharply and the influence on other circuits is not changed so as to reduce the influence of overvoltage on the following sensitive circuits. By using this function, abnormal overvoltage which often occurs in the circuit can be suppressed, and the circuit can be protected from the damage of the overvoltage. In view of the above-mentioned disadvantages, it is necessary to design a varistor with double-sided thermal protection.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a piezoresistor with double-sided thermal protection, which has the advantages of double-sided thermal protection and can solve the problems in the prior art.

In order to achieve the purpose, the utility model provides the following technical scheme: a piezoresistor with double-sided thermal protection comprises an insulating rubber sleeve, a first pin, a second pin and a piezoresistor body, wherein the insulating rubber sleeve is sleeved outside the piezoresistor body, and a first electrode and a second electrode are arranged on two sides of the piezoresistor body;

the first electrode is arranged on the front side of the piezoresistor body, a first fuse is arranged on one side, far away from the piezoresistor body, of the first electrode, a first hot melt adhesive adhesion part is arranged between the first fuse and the first electrode, the first fuse and the first electrode are connected in an adhesion mode through the first hot melt adhesive adhesion part, a first pin is arranged on one side, far away from the piezoresistor body, of the first electrode, one end of the first pin extends downwards and penetrates out of the insulating rubber sleeve, the other end of the first pin is intersected with the first fuse, a first tin soldering point is arranged at the intersection of the first pin and the first fuse, and the first pin and the first fuse are connected in a tin soldering mode through the first tin soldering point;

the second electrode is arranged on the reverse side of the piezoresistor body, a second fuse is arranged on one side, far away from the piezoresistor body, of the second electrode, a second hot melt adhesive adhesion part is arranged between the second fuse and the second electrode, the second fuse and the second electrode are connected through the adhesion of the second hot melt adhesive adhesion part, a second pin is arranged on one side, far away from the piezoresistor body, of the second electrode, one end of the second pin extends downwards and penetrates out of the insulating rubber sleeve, the other end of the second pin is intersected with the second fuse, a second tin soldering point is arranged at the intersection of the second pin and the second fuse, the second pin and the second fuse are connected through the second tin soldering point, and an over-temperature protector is arranged on the second fuse.

Preferably, the piezoresistor body is a zinc oxide resistor ceramic chip.

Preferably, a first filling dielectric layer and a second filling dielectric layer are arranged inside the insulating rubber sleeve.

Preferably, the first filling medium layer is arranged on one side close to the first electrode.

Preferably, the second filling medium layer is arranged on one side close to the second electrode.

Compared with the prior art, the utility model has the following beneficial effects:

1. this varistor with two-sided thermal protection is provided with first fuse on the first electrode, is provided with the second fuse on the second electrode, and the heat that varistor body and electrode sent can be absorb in the setting of fuse, and the fuse fuses when the temperature of varistor body reaches or surpasss a certain upper limit value, can in time cut off the circuit, avoids continuously rising the temperature.

2. According to the varistor with double-sided thermal protection, the first filling dielectric layer and the second filling dielectric layer are arranged in the insulating rubber sleeve, and the first filling dielectric layer and the second filling dielectric layer contain flame retardants, so that the varistor can be prevented from being burnt quickly or broken at high temperature, potential safety hazards are reduced, and the varistor is convenient to repair.

3. This piezo-resistor with two-sided thermal protection is provided with the excess temperature protector on the second fuse, thereby the setting of excess temperature protector can apply to the lasting high voltage of piezo-resistor in a certain time and arouse under the overheated condition, thereby it is whole to reduce the emergence of potential safety hazard to carry out the conduction to high heat protection resistor and circuit.

Drawings

FIG. 1 is a schematic front view of the present invention;

FIG. 2 is a schematic front view of the internal structure of the present invention;

FIG. 3 is a schematic view of the backside internal structure of the present invention;

FIG. 4 is a schematic cross-sectional side view of the present invention.

In the figure: 1. insulating rubber sleeves; 2. a first pin; 3. a second pin; 4. a varistor body; 5. a first electrode; 6. the first hot melt adhesive adhesion part; 7. a first fuse; 8. a first solder joint; 9. a second electrode; 10. an over-temperature protector; 11. the second hot melt adhesive is adhered; 12. a second fuse; 13. a second solder joint; 14. a first filling medium layer; 15. and filling the dielectric layer with the second material.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-4, a varistor with double-sided thermal protection comprises an insulating rubber sleeve 1, a first pin 2, a second pin 3 and a varistor body 4, wherein the varistor body 4 is a zinc oxide resistor ceramic sheet, the insulating rubber sleeve 1 is sleeved outside the varistor body 4, a first filling dielectric layer 14 and a second filling dielectric layer 15 are arranged inside the insulating rubber sleeve 1, a first electrode 5 and a second electrode 9 are arranged on two sides of the varistor body 4, the first filling dielectric layer 14 is arranged on one side close to the first electrode 5, the second filling dielectric layer 15 is arranged on one side close to the second electrode 9, and the first filling dielectric layer 14 and the second filling dielectric layer 15 contain a flame retardant, so that the varistor can be prevented from being burned quickly or broken at high temperature, thereby reducing potential safety hazards and facilitating repair;

the first electrode 5 is arranged on the front surface of the piezoresistor body 4, a first fuse 7 is arranged on one side of the first electrode 5 far away from the piezoresistor body 4, a first hot melt adhesive bonding part 6 is arranged between the first fuse 7 and the first electrode 5, the first fuse 7 and the first electrode 5 are connected in an adhesive manner through the first hot melt adhesive bonding part 6, a first pin 2 is arranged on one side of the first electrode 5 far away from the piezoresistor body 4, one end of the first pin 2 extends downwards and penetrates out of the insulating rubber sleeve 1, the other end of the first pin 2 is intersected with the first fuse 7, a first tin soldering point 8 is arranged at the intersection of the first pin 2 and the first fuse 7, the first pin 2 is in tin soldering connection with the first fuse 7 through the first tin soldering point 8, the first fuse 7 can absorb heat generated by the piezoresistor body 4 and the electrodes, and the fuse can be fused when the temperature of the piezoresistor body 4 reaches or exceeds a certain upper limit value, the circuit can be cut off in time, and continuous temperature rise is avoided;

the second electrode 9 is arranged on the reverse side of the varistor body 4, a second fuse 12 is arranged on one side of the second electrode 9 far away from the varistor body 4, a second hot melt adhesive joint 11 is arranged between the second fuse 12 and the second electrode 9, the second fuse 12 and the second electrode 9 are in adhesive linkage through the second hot melt adhesive joint 11, a second pin 3 is arranged on one side of the second electrode 9 far away from the varistor body 4, one end of the second pin 3 extends downwards and penetrates out of the insulating rubber sleeve 1, the other end of the second pin 3 is intersected with the second fuse 12, a second tin soldering point 13 is arranged at the intersection of the second pin 3 and the second fuse 12, the second pin 3 and the second fuse 12 are in tin soldering connection through the second tin soldering point 13, the second fuse 12 is provided with an over-temperature protector 10, and the over-temperature protector 10 can be soldered under the condition that continuous high voltage applied to the varistor within a certain time to cause overheating, the high heat is conducted, so that the resistor and the whole circuit are protected, and the potential safety hazard is reduced.

In summary, according to the varistor with double-sided thermal protection, the fuse is arranged to absorb heat generated by the varistor body 4 and the electrodes, the fuse is fused when the temperature of the varistor body 4 reaches or exceeds a certain upper limit value, the circuit can be cut off in time, continuous temperature rise is avoided, the first filling dielectric layer 14 and the second filling dielectric layer 15 contain a fire retardant, rapid combustion or breakage can be avoided at high temperature, potential safety hazards are reduced, repair is facilitated, the over-temperature protector 10 can conduct high heat to protect the whole varistor and the circuit under the condition that continuous high voltage applied to the varistor in a certain time causes overheating, and the potential safety hazards are reduced.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a piezo-resistor with two-sided thermal protection, includes insulating gum cover (1), first pin (2), second pin (3) and piezo-resistor body (4), its characterized in that: the outer part of the piezoresistor body (4) is sleeved with an insulating rubber sleeve (1), and a first electrode (5) and a second electrode (9) are arranged on two sides of the piezoresistor body (4);

the first electrode (5) is arranged on the front face of the piezoresistor body (4), a first fuse wire (7) is arranged on one side, far away from the piezoresistor body (4), of the first electrode (5), a first hot melt adhesive bonding part (6) is arranged between the first fuse wire (7) and the first electrode (5), the first fuse wire (7) and the first electrode (5) are connected in an adhesive mode through the first hot melt adhesive bonding part (6), a first pin (2) is arranged on one side, far away from the piezoresistor body (4), of the first electrode (5), one end of the first pin (2) extends downwards and penetrates through the insulating rubber sleeve (1), the other end of the first pin (2) is intersected with the first fuse wire (7), a first tin soldering point (8) is arranged at the intersection of the first pin (2) and the first fuse wire (7), and the first pin (2) and the first fuse wire (7) are connected in a tin soldering mode through the first point (8);

the second electrode (9) is arranged on the reverse side of the piezoresistor body (4), a second fuse wire (12) is arranged on one side, far away from the piezoresistor body (4), of the second electrode (9), a second hot melt adhesive bonding part (11) is arranged between the second fuse wire (12) and the second electrode (9), the second fuse wire (12) and the second electrode (9) are bonded and linked through the second hot melt adhesive bonding part (11), a second pin (3) is arranged on one side, far away from the piezoresistor body (4), of the second electrode (9), one end of the second pin (3) extends downwards and penetrates through the insulating rubber sleeve (1), the other end of the second pin (3) is intersected with the second fuse wire (12), a second tin soldering point (13) is arranged at the intersection of the second pin (3) and the second fuse wire (12), and the second pin (3) and the second fuse wire (12) are connected through a second tin soldering point (13), an over-temperature protector (10) is arranged on the second fuse (12).

2. The varistor of claim 1, wherein said varistor further comprises: the piezoresistor body (4) is a zinc oxide resistor ceramic chip.

3. A varistor with double-sided thermal protection according to claim 2, characterized in that: and a first filling dielectric layer (14) and a second filling dielectric layer (15) are arranged in the insulating rubber sleeve (1).

4. A varistor with double-sided thermal protection according to claim 3, characterized in that: the first filling medium layer (14) is arranged on one side close to the first electrode (5).

5. The varistor of claim 4, wherein said varistor further comprises: the second filling medium layer (15) is arranged on one side close to the second electrode (9).