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Piezoresistor with self-checking function and surge protector thereof

A varistor and functional technology, applied in varistors, overvoltage protection resistors, resistors, etc., can solve the problems of surge protector damage, incomplete detachment, and easy fire, so as to ensure normal use, The effect of overcoming the defect of fault indication and improving the safety of use

Pending Publication Date: 2019-09-13
SICHUAN WEIYU ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, due to the influence of factors such as solder wire drawing and adhesion between the conductive plate and the lead-out pin of the heating chip, it is prone to incomplete detachment, which leads to the failure of the elastic push rod assembly of the mechanical structure in the surge protector to indicate the fault accurately and timely. If the thermally damaged varistor cannot be replaced in time, it will not only easily lead to damage to the surge protector, but also easily lead to safety accidents such as fire

Method used

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  • Piezoresistor with self-checking function and surge protector thereof
  • Piezoresistor with self-checking function and surge protector thereof
  • Piezoresistor with self-checking function and surge protector thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Such as figure 1As shown, the piezoresistor with self-test function includes a piezoresistor body 1 and at least one color-changing body 2, and the color-changing body 2 includes a thermochromic material coating 3, and the thermochromic material is irreversible thermochromic The thermochromic material coating 3 is arranged on the surface of the piezoresistor body 1 and connected to the piezoresistor body 1 through heat conduction.

[0036] The piezoresistor with self-test function in this embodiment is preferably coated with an irreversible thermochromic material on the piezoresistor body 1, and directly contacts with the piezoresistor body 1 to form a thermochromic material coating 3. When the varistor body 1 continues to generate heat and reaches the discoloration temperature of the irreversible thermochromic material, the thermochromic material coating 3 produces a color change, indicating the thermal damage of the varistor, realizing the self-check function of the v...

Embodiment 2

[0042] Such as Figure 1-2 As shown, the structure of the piezoresistor with self-test function in this embodiment is the same as that of Embodiment 1, the difference is that: the color changing body 2 also includes a thermally conductive sheet 5 that is thermally connected to the piezoresistor body 1, and the The heat-conducting sheet 5 is provided with the thermochromic material coating 3 .

[0043] The varistor with self-test function of this embodiment conducts the heat generated by the varistor body 1 through the heat conduction sheet 5 directly connected to the varistor body 1 to conduct heat exchange with the varistor body 1, and conducts the heat in the heat conduction The thermochromic material coating 3 is formed on the sheet 5 by screen printing to indicate the thermal damage of the piezoresistor on the heat conducting sheet 5 and prevent the piezoresistor body 1 from being unable to pass through its own convection due to high internal power loss. The heat dissipat...

Embodiment 3

[0045] Such as Figure 1-3 As shown, the structure of the piezoresistor with self-checking function in this embodiment is the same as that of Embodiment 2, the difference is that the piezoresistor body 1 is thermally connected with a temperature sensitive element 6 .

[0046] The piezoresistor with self-checking function of this embodiment preferably adopts a piezoresistor connected with a thermally conductive sheet 5, so that the thermally conductive sheet 5 is thermally connected to the temperature sensitive element 6, and the temperature sensitive element 6 includes a temperature control switch, One or more of heat-sensitive semiconductor devices, thermal resistors, and thermocouples. This embodiment takes a normally closed temperature control switch as an example. A normally closed temperature control switch uses a bimetallic sheet as a temperature sensing component. The temperature-sensitive metal sheet of the temperature control switch is closely attached to the heat con...

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Abstract

The invention relates to the technical field of protective electric appliances, in particular to a piezoresistor with a self-checking function and a surge protector thereof. The piezoresistor with theself-checking function comprises a piezoresistor body and at least one color-changing body, wherein a color-changing body is in heat conduction connection with the piezoresistor body, the color-changing body changes color by sensing a temperature and marks the temperature condition of the piezoresistor body, so that when the temperature of the piezoresistor changes, the color of the color-changing body changes, so that the self-checking function of the piezoresistor is achieved, and workers can determine the thermal damage condition of the piezoresistor according to the color change conditionof the color-changing body, it is achieved that the piezoresistor is replaced in time after thermal damage and the normal use of the surge protector with the piezoresistor with the self-checking function is guaranteed, a circuit is cut off in time, the temperature control protection effect is achieved, the defect that fault indication is achieved mechanically in the prior art is overcome, the fault rate is lower, and the use safety of the surge protector is improved.

Description

technical field [0001] The invention relates to the technical field of protective electrical appliances, in particular to a varistor with a self-check function and a surge protector thereof. Background technique [0002] Varistor is a resistive device with nonlinear volt-ampere characteristics. It is often used as an overvoltage protection device. When the varistor is subjected to overvoltage energy, its temperature continues to rise, and when it reaches the withstand limit of the varistor, the voltage The sensitive resistor has a thermal damage failure and needs to be replaced before it can continue to play a protective role. [0003] However, the existing varistor itself cannot display the thermal damage condition, so that after the varistor is thermally damaged, the user cannot find and replace the varistor in time, which affects the protection of sensitive devices using the varistor. [0004] Existing surge protectors are generally equipped with piezoresistors, and the ...

Claims

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Application Information

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IPC IPC(8): H01C1/04H01C1/16H01C7/12H02H9/04
CPCH01C1/04H01C1/16H01C7/12H02H9/041
Inventor 王军陈晓法朱骏
Owner SICHUAN WEIYU ELECTRIC CO LTD
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