A lightning protection overvoltage protection device

A technology of overvoltage protection devices and varistors, applied in the direction of emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection circuit devices, electrical components, etc., can solve the problem of rated operating current limitation and increased probability of damage , Reduce the probability of power frequency overvoltage deflagration accidents of pressure sensitive components, etc.
CN103346547BInactive Publication Date: 2016-03-30SOUTH CHINA UNIV OF TECH +2
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
SOUTH CHINA UNIV OF TECH
Publication Date
2016-03-30
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention discloses an anti-thunder overvoltage protection device. The anti-thunder overvoltage protection device comprises a piezoresistor, a positive temperature coefficient thermistor and a gas discharge tube, wherein the positive temperature coefficient thermistor is connected with the gas discharge tube in parallel and then connected with the piezoresistor in series; the positive temperature coefficient thermistor and the piezoresistor form a thermal coupling relationship. The piezoresistor, the positive temperature coefficient thermistor and the gas discharge tube can be packaged into a whole, or the piezoresistor and the positive temperature coefficient thermistor are packaged into a whole, thus a packaged body is formed, and the gas discharge tube is located outside the packaged body. The anti-thunder overvoltage protection device not only can restrain operation overvoltage and fault power frequency overvoltage, but also can have the protection function of a normal voltage-sensitive element when lightning stroke pulse overvoltage occurs.
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Description

technical field

[0001] The invention relates to lightning protection and overvoltage protection technology, in particular to a composite lightning protection and overvoltage protection device. 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 protecti...

Claims

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