Voltage dependent resistor with hot protection function

Abstract

The invention relates to a heat-protective varistor which has simple and compact structure, high reaction speed and wide application range and self failure protection function. An insulation bracket is arranged on a main body of the varistor component, and a heat fuse and a contact pin are mutually and electrically connected and are arranged on the insulation bracket. When the main body is affected by various excessive voltages to result in an abnormal temperature rising, the heat conduction area can be enlarged with the help of the insulation bracket so as to quickly transmit heat to the heat fuse and then the temperature of the heat fuse rises in virtue of the excessive heat; once the temperature is above a melting point the fuse forms a melted liquid state. A plurality of grooves are arranged on the insulation bracket, and the capillary force generated by the grooves can further promote the melted liquid fuse to diffuse quickly. And the quick melting-diffusion and separation of the heat fuse can reflect the excessive heat state in time to avoid the burning of the main body, so as to reach the aim of cutting the circuit in time to protect the electronic components of a current loop from being damaged.

Description

technical field [0001] The present invention relates to a varistor with a thermal protection function, in particular to a varistor with a self-failure protection function, that is, when encountering various types of overvoltages and causing the body temperature to rise abnormally and fail, the varistor with a self-protection function Varistor. Background technique [0002] With its superior nonlinear volt-ampere characteristics, varistors are widely used in overvoltage protection and surge absorbing components of lines, equipment and components. Regardless of whether varistors are used in power lines or electronic circuits, if various types of instantaneous If overvoltage occurs frequently, the varistor will operate frequently to suppress the increase in overvoltage and absorb and release surge energy to protect electrical equipment and components. If things go on like this, the performance of the varistor will deteriorate or even fail in the long run. [0003] Furthermore,...

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Problems solved by technology

[0002] With its superior nonlinear volt-ampere characteristics, varistors are widely used in overvoltage protection and surge absorbing components of lines, equipment and components. Regardless of whether varistors are used in power lines or electronic circuits, if various types of instantaneous If overvoltage occurs frequently, the varistor will operate frequently to suppress the increase in overvoltage and absorb and release surge energy to protect electrical equipment and components. If things go on like this, the performance of the varistor will inevitably deteriorate or even fail.

[0003] Furthermore, when the piezoresistor is subjected to continuous overvoltage, the piezoresistor will quickly and locally break down and cause fire and combustion. In the piezoresistor element of the prior art, it can have a thermal protection function. The varistor with protective function is generally equipped with a thermal fuse attached close to the varistor element in the current circuit. Using the principle that the melting point of the thermal fuse is lower than that of other components, when an excessive current passes through and generates high temperature, the high temperature The thermal fuse is burned to form an open circuit, thereby achieving the thermal protection function. However, due to the slow response speed of the thermal fuse as the overheating protection structure in the varistor with thermal protection function of the prior art, it is still impossible to sense the overheating in time. High temperature and timely disconnection, or the ability to withstand large current impact is weak and easy to fail, so the thermal protection function of the varistor with failure protection in the prior art still has its defects

[0004] This shows that above-mentioned existing varistor obviously still has inconvenience and defect in structure and use, and urgently needs to be further improved

In order to solve the above-mentioned problems, the relevant manufacturers have tried their best to find a solution, but no suitable design has been developed for a long time, and the general products do not have a suitable structure to solve the above-mentioned problems. This is obviously related. The problem that the industry is eager to solve

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