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Anti-thunder overvoltage protection component

An overvoltage protection and component technology, applied in the direction of emergency protection circuit devices, emergency protection circuit devices, electrical components, etc. for limiting overcurrent/overvoltage, which can solve the limitation of rated working current, increased probability of damage, circuit operation Overvoltage and fault power frequency overvoltage protection capability is reduced to achieve the effect of preventing deflagration accidents

Inactive Publication Date: 2013-10-02
SOUTH CHINA UNIV OF TECH +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] To sum up, in order to reduce the probability of power frequency overvoltage deflagration accidents of varistors, the varistor voltage of varistors can be increased, but this will inevitably increase the pulse residual voltage, and the protected line will be damaged by operating overvoltage and fault power frequency overvoltage The probability of the accident is greatly increased; the three-terminal device combined with the PTC thermal element and the ZnO varistor can reduce the probability of the power frequency overvoltage deflagration accident of the varistor, and can achieve a lower pulse residual voltage at the same time, but the rated work of the protected circuit The current is limited; the application of ZnO varistors in series with the gap can prevent deflagration accidents caused by long-term load aging of varistors, but the protection ability against circuit operation overvoltage and fault power frequency overvoltage is reduced

Method used

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Embodiment 1

[0032] Such as Figure 1~2 As shown, the lightning protection and overvoltage protection assembly of the present embodiment includes a zinc oxide varistor sheet 11, a positive temperature coefficient ceramic thermistor sheet 12 and a gas discharge tube 13, and the positive temperature coefficient ceramic thermistor sheet 12 is made of In a ring structure, the size of the inner hole of the positive temperature coefficient ceramic thermistor sheet 12 matches the outer diameter of the gas discharge tube 13, and the gap between the two is 0.1 to 1mm; the thickness of the positive temperature coefficient ceramic thermistor sheet 12 is the same as The gas discharge tube 13 has the same height, and the outer diameters of the zinc oxide varistor sheet 11 and the positive temperature coefficient ceramic thermistor sheet 12 are consistent; The upper electrode surface of the gas discharge tube 13 is placed in the inner hole of the positive temperature coefficient ceramic thermistor sheet...

Embodiment 2

[0041] Such as Figure 5-6 As shown, the lightning protection overvoltage protection assembly of the present embodiment includes a zinc oxide varistor 21, a positive temperature coefficient ceramic thermistor 22 and a gas discharge tube 23, a zinc oxide varistor 21, a positive temperature coefficient thermal The varistor sheets 22 are all square, and the external dimensions of the varistor sheets, thermistor sheets and gas discharge tubes need to be properly matched: the gas discharge tube specifications adopted are the same as in Embodiment 1, and the size of the varistor sheets used is long* Width*height=15*15*3mm, the dimensions of the thermistor used are length*width*height=15*9*5mm. The lower electrode surface of the positive temperature coefficient thermistor sheet 22 is welded to the upper electrode surface of the zinc oxide varistor sheet 21 by soldering; the gas discharge tube 23 is located on one side of the zinc oxide varistor sheet 21, and its lower end surface is ...

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Abstract

The invention discloses an anti-thunder overvoltage protection component which comprises a piezoresistor disc, a positive temperature coefficient thermistor disc and a gas discharge tube, wherein the piezoresistor disc, the positive temperature coefficient thermistor disc and the gas discharge tube are integratedly packaged; the first common terminal of the positive temperature coefficient thermistor disc and the gas discharge tube is a first leading-out terminal; the second common terminal of the positive temperature coefficient thermistor disc and the gas discharge tube is connected with one end of the piezoresistor disc; the other end of the piezoresistor disc is a second leading-out terminal. The anti-thunder overvoltage protection component can restrain the switching overvoltage and fault power frequency overvoltage, and can play the protective role of a normal pressure cell in case of a thunderstrike pulse overvoltage.

Description

technical field [0001] The invention relates to lightning protection and overvoltage protection technology, in particular to a composite lightning protection and overvoltage protection component. Background technique [0002] ZnO varistors have been widely used in power electronic circuits to absorb overvoltage caused by lightning pulses and power frequency overvoltage caused by system operation and system failure. However, the varistor itself has a certain limit for absorbing surge energy. The varistor connected in parallel to the power circuit absorbs overvoltage energy (especially the long-lasting power frequency overvoltage). At the same time, its own temperature rises. When the varistor When the energy absorbed by the resistance is too large, the varistor may explode and catch fire. Nowadays, this problem is usually solved by increasing the varistor voltage and diameter of the varistor, but this reduces the absorption wave of the varistor to a certain extent. The prote...

Claims

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Application Information

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IPC IPC(8): H02H9/06
Inventor 卢振亚欧润彬沈朝阳杨凤金
Owner SOUTH CHINA UNIV OF TECH
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