High-reliability thermal-protection piezoresistor

A piezoresistor and piezoresistor technology, applied in the direction of piezoresistors, etc., to achieve the effects of fast detachment speed, good safety, and wide detachment current range

Inactive Publication Date: 2015-04-01
常州市天泰电路保护技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From this, it is recognized that trying to reduce the distance between the current concentration point and the thermal disconnection point is the key to realizing safe disconnection, but the difficulty lies in that the position of the thermal breakdown point of the piezoresistor is random and difficult to determine in advance

Method used

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  • High-reliability thermal-protection piezoresistor
  • High-reliability thermal-protection piezoresistor
  • High-reliability thermal-protection piezoresistor

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Embodiment Construction

[0019] The present invention will now be described in further detail in conjunction with the accompanying drawings and preferred embodiments. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, so they only show the configurations related to the present invention.

[0020] Such as Figure 1-2 As shown, a highly reliable thermal protection varistor includes a housing; a varistor chip and a fixing plate covering the front and back sides of the varistor chip are arranged in the housing; the fixing plate on the front and back sides Elastic parts are provided respectively; one end of the elastic part is fixed on the fixed plate; the other end of the elastic part is connected to the insulating plate; body. figure 1 The elastic member shown in is a tension spring.

[0021] The front and back of the varistor chip are also provided with low-temperature trip points; the low-temperature trip po...

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Abstract

The invention relates to a high-reliability thermal-protection piezoresistor. An overheating separation node is arranged at each of two surfaces of a resistor disc, and the positions of the nodes are selected properly, so that the current separation range of the piezoresistor is wide from several mA to 100A, the separation speed is high and is faster than that of most of existing products under large current by 10 times, the safety is good, and the firing is avoided; the piezoresistor can be used independently and also can be used as a chip of a surge protection device (SPD) for preventing lightning overvoltage, operation overvoltage and other surge overvoltage, so that the electrical and electric devices and equipment are protected; when the piezoresistor is used in a use circuit, a fuse protector or an air switch for preventing the short circuit of an upstream piezoresistor can be omitted.

Description

technical field [0001] The invention relates to a piezoresistor, in particular to a piezoresistor with a wide range of detachment current, fast detachment speed, good safety and high reliability thermal protection piezoresistor. Background technique [0002] Due to its excellent voltage limiting characteristics and energy absorption capacity, varistors have become the main protection components for surge overvoltage. Under the normal system voltage, it only has leakage current of microampere level, so it is very safe to work. However, when a faulty overvoltage occurs in the system, or due to the deterioration of the MOV itself, the current density flowing through it reaches several mA / cm2, which will overheat the varistor ceramic body, cause the current concentration effect, and eventually develop to a certain weak point. points are thermally breakdown. The combination of high temperature and voltage during breakdown will cause the surrounding gas to generate arc discharge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/10
Inventor 张南法岳涛丁留华萧建虎
Owner 常州市天泰电路保护技术有限公司
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