Surge protector with long service lifetime and high protection

Abstract

The invention relates to a surge protector with long service lifetime and high protection. The surge protector comprises a current output outer cylinder, wherein a zinc oxide piezoresistor substrate is arranged at an internal bottom part of the current output outer cylinder, a pressure bearing ring, a polarity cross cap and a T-shaped isolation sleeve are sequentially arranged on the piezoresistor substrate, an induction coil is wound around the pressure bearing ring in a matching way, a current transmission end of an induction coil is connected with a passive current comparison module by two groups of wiring caps, and the piezoresistor substrate, the polarity cross cap and the induction coil are pressed in the current output outer cylinder by a hole elastic baffle ring to form a whole current discharge passage. The surge protector has the advantages of reasonable structure, reliable working performance, good protection effect, long service lifetime and the like, and is convenient to operate, and the development trend for effect improvement of a current surge protector and the increasingly market demand can be satisfied very well.

Description

technical field [0001] The invention belongs to the technical field of electronic equipment protection, and relates to a surge protector with long service life and high protection for releasing instantaneous overvoltage. Background technique [0002] At present, although the manufacturing technology of surge protection devices (Surge Protection Device, SPD) at home and abroad is constantly improving, the phenomenon of SPD igniting and burning and causing accidents still occurs from time to time, causing great losses. The reason for the problem is that the traditional SPD technology still has the following defects in practical application: (1) The protector and the induction coil are set separately, which requires a long cable installation and an external fuse in series, during which the fuse needs to be replaced irregularly Maintenance and may lead to protection failure, the fuse will also cause the residual voltage to rise, which will reduce the protection ability, that is,...

AI Technical Summary

Problems solved by technology

[0002] At present, although the manufacturing technology of surge protection devices (Surge Protection Device, SPD) at home and abroad is constantly improving, the phenomenon of SPD igniting and burning and causing accidents still occurs from time to time, causing great losses

The reason for the problem is that the traditional SPD technology still has the following defects in practical application: (1) The protector and the induction coil are set separately, which requires a long cable installation and an external fuse in series, during which the fuse needs to be replaced irregularly Maintenance and may lead to protection failure, the fuse will also cause the residual voltage to rise, which will reduce the protection ability, that is, the fuse and the external cable will increase the residual voltage and deteriorate the protection level, and the service life of the product will be short; (2). The resistance substrate in the surge protector is an outer glaze coating structure, and the angle, edge and sharp effect of the residual stress and electric field force on its side during the firing process lead to poor insulation, corrosion resistance and salt spray resistance of the resistance substrate. The periphery of the resistance substrate is prone to flashover or breakdown caused by insulation; (3) The connection of the chip and other components in the traditional surge protector adopts high-temperature welding of alloy solder. Due to the stress of SPD chip welding, the product is prone to Explosion and fire, thermal collapse, conductive current density distribution and other fatal problems of MOV (Metal Oxide Varistor); (4), the internal connection parts of the product are easy to age, and are easily damaged in a strong vibration environment, so that they often do not meet professional standards ( IEC standard) does not meet the development trend and market demand of today's surge protector effect improvement

(5) In the past, the isolation material of surge protectors used conventional PBT or nylon materials, which would generate carbon when heated, resulting in electrode pollution and loss of dielectric strength

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