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A thermal protection type varistor

A varistor and thermal protection technology, applied in varistors, resistor terminals/electrodes, resistor shells/packaging shells/potting, etc., can solve the problems of shortening disconnection time and poor reliability, and achieve stable reliability Good, novel design effect

Pending Publication Date: 2018-12-18
BESTBRIGHT ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a heat-protected varistor for the deficiencies of the prior art. The heat-protected varistor has a novel design, good stability and reliability, and can effectively disconnect the circuit while aging and failing. And it can shorten the disconnection time, that is, there will be no incomplete disconnection and poor reliability

Method used

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  • A thermal protection type varistor
  • A thermal protection type varistor
  • A thermal protection type varistor

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Embodiment Construction

[0029] The present invention will be described below in conjunction with specific embodiments.

[0030] Such as Figure 1 to Figure 6 As shown, a heat-protected varistor includes an internal component of the resistor and a shell surrounding the internal component of the resistor. The internal component of the resistor includes a varistor chip 1, a thermal protection device 2, a first lead-out electrode 31, a second Two lead-out electrodes 32. The thermal protection device 2 includes a fuse housing and a thermal fuse installed inside the fuse housing. The two electrodes of the thermal fuse protrude to the outer ends of the fuse housing respectively. fuse, the fuse housing and the piezoresistor chip 1 are spaced apart and one of the electrodes of the piezoresistor chip 1 is welded in series with one of the electrodes of the thermal fuse, and the other electrode of the thermal fuse is welded in series with the first lead-out electrode 31, The other electrode of the varistor chip...

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PUM

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Abstract

A thermal protection varistor is disclosed, which includes a resistor internal component and a shell, the resistor internal component includes a varistor chip, a thermal protection device, a first extraction electrode, and a second extraction electrode, the thermal protection device includes a fuse shell and a temperature fuse installed inside the fuse shell, the temperature fuse is a fuse containing a fusing agent, the fuse shell is spaced apart from the varistor chip, and one electrode of the varistor chip is bonded in series with one electrode of the temperature fuse, the other electrode ofthe temperature fuse is bonded in series with the first lead electrode, and the other electrode of the varistor chip is bonded in series with the second lead electrode. The shell is a coating protective layer structure or a combined structure composed of a hard shell and a potting adhesive layer. The invention has the beneficial effects of novel design, good stability and reliability, and can effectively cut off the circuit while aging failure, and can shorten the cut-off time, that is, the situations of incomplete cut-off and poor reliability do not occur.

Description

technical field [0001] The invention relates to the technical field of electronic components, in particular to a thermal protection type piezoresistor. Background technique [0002] Varistors are widely used in circuit protection. When the voltage applied to the varistor is lower than its threshold, the current flowing through it is extremely small, which is equivalent to a resistor with infinite resistance, that is, When the voltage applied to it is lower than its threshold, it is equivalent to an off-state switch; when the voltage applied to the varistor exceeds its threshold, the current flowing through it surges, which is equivalent to the resistance An infinitesimal resistance, that is, it acts as a closed switch when the voltage applied to it is above its threshold. Among them, for varistors, as the varistors age, the leakage current of the product itself increases, which will cause the temperature of the product to become higher and higher, eventually leading to a sh...

Claims

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Application Information

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IPC IPC(8): H01C7/10H01C1/02H01C1/14
CPCH01C1/02H01C1/14H01C7/10
Inventor 胡相荣李小明
Owner BESTBRIGHT ELECTRONICS