Blocking type surge protection device of low-conductive resistor

Abstract

The invention relates to a blocking type surge protection device of low-conductive resistor, which has low-conductive resistor characteristics under the application of small trigger current, at least comprising first, second and third depletion type field effect transistors Q1, Q2, Q3; first and second variable resistor elements; a conductive path formed by the serial connection of first and second resistors, and a circuit forming module, wherein the drain electrode of Q1 is connected to the a module input end; the grid electrode of Q1 is connected to the source electrode of Q2; the drain electrode of Q2 is connected to a module output end; the grid electrode of Q2 is connected to the source electrode of Q1; the first variable resistor element is connected to the source electrodes of Q1 and Q3; the second variable resistor element is connected to the source electrode of Q2 and the drain electrode of Q3; the grid electrode of Q3 is respectively connected to the first and second resistors; the other end of the first resistor is connected to the module input end; the other end of the second resistor is connected to the module output end. The device of the invention can specifically protect a single load, and can be used in a system with a high bandwidth.

Description

technical field [0001] The invention relates to the field of semiconductor devices, in particular to the field of semiconductor surge protection devices, and is a low on-resistance blocking surge protection device. Background technique [0002] Power surge or transient overvoltage is defined as a voltage that significantly exceeds the design value in an electronic circuit. It mainly includes lightning strikes, power line laps, power line induction, or ground bounce. When the surge is high enough, the transient overvoltage will cause serious damage to electronic equipment such as computers and telephones. It also results in reduced equipment life. [0003] Transient voltage surge suppressors limit the energy of electrical surges that couple to equipment, thereby protecting electronic equipment from damage. Products in this category include: surge protection thyristors, oxide varistors and avalanche diodes. Both types of devices are connected in parallel in the protected ci...

AI Technical Summary

Problems solved by technology

[0005] (2) Will limit system bandwidth (capacitive loads limit them to low-bandwidth applications);

[0006] (3) A complex design consisting of multiple components is required, resulting in a high failure rate;

[0007] (4) Often require a larger space;

[0008] (5) For the protection design scheme, the unit cost is high

However, in some applications, low on-resistance is required under the condition of small trigger current, at this time, conventional blocking surge protection devices cannot meet the requirements

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