Surge protection circuit and surge protector

Abstract

The invention provides a surge protection circuit and a surge protector. A high-voltage pulse signal is collected and output through a collection unit, wherein the high-voltage pulse signal is used for representing a surge signal in a power supply or signal circuit of a protected load; the high-voltage pulse signal is conditioned through a conditioning unit to generate a trigger signal; the trigger signal is loaded to a first discharge unit to ensure the conditions that the first discharge unit can timely act and surges on the power supply or signal circuit are discharged; and a second discharge unit can clamp the surges on the power supply or signal circuit into a withstand voltage range of the protected load. According to the surge protection circuit and the surge protector, the condition that the first discharge unit can be timely triggered is ensured through collecting and conditioning processes; and the problem of inter-stage coordination between the first discharge unit and the second discharge unit is solved.

Description

technical field [0001] The invention relates to the technical field of circuits, in particular to a surge protection circuit and a surge protector. Background technique [0002] With the continuous development of technology, electronic devices have become an indispensable part of our daily life. Due to lightning, start-stop or failure of electronic equipment, etc., it will cause instantaneous overvoltage or overcurrent inside the electronic equipment, and then destroy the electronic equipment. Therefore, a surge protector (SPD) is often used to protect electronic equipment at present. [0003] see figure 1 , is a kind of SPD commonly used in the prior art; the SPD includes: varistor MOV, gas discharge tube GDT, decoupling inductor L and diode TVS; The first-level lightning protection component composed of the tube GDT and the varistor MOV is first turned on and absorbs most of the surge signal; the second-level lightning protection component composed of the diode TVS is u...

AI Technical Summary

Problems solved by technology

[0004] However, as the load current increases, the cross-sectional area of ​​the decoupling inductor L used in this solution will increase simultaneously, making the volume of the SPD too large

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