electrical system

Abstract

The invention provides a circuit system for preventing electrostatic discharge interference. An electrostatic discharge clamp circuit is provided with a first end and a second end which are connected with high potential of a power supply and the ground respectively to release static electricity generated by the power supply; an inner function circuit is coupled with the power supply and the electrostatic discharge clamp circuit; a dynamic ground switching circuit is provided with a first input end and a first output end, the first input end is connected with the ground, and the first output end is connected with the inner function circuit. When negative surge voltage exists in the ground end of the power supply, the dynamic ground switching circuit switches a low resistance path between the electrostatic discharge clamp circuit and the inner function circuit to a high resistance path, and the surge voltage can be prevented from entering the inner function circuit.

Description

technical field [0001] The present invention relates to the technical field of electrostatic discharge, in particular to a circuit system for preventing electrostatic discharge interference. Background technique [0002] Electrostatic Discharge (ESD) is the main factor that causes most electronic components or electronic systems to be damaged by electrical overstress (Electrical Overstress, EOS). Such damage will lead to permanent damage to semiconductor components and computer systems, thereby affecting the circuit function of an integrated circuit (Integrated Circuit, IC), and making the electronic product work abnormally. [0003] In order to prevent electrostatic discharge (ESD) damage, an electrostatic discharge clamping circuit is generally provided between an internal circuit and a power supply. figure 1 is a schematic diagram of a known ESD clamping circuit. Such as figure 1 As shown, an electrostatic discharge clamping circuit 110 is provided between an internal ...

AI Technical Summary

Problems solved by technology

[0004] Although the main energy of the positive surge voltage is absorbed by the ESD clamping circuit 110, part of the energy of the positive surge voltage may still flow into the internal functional circuit 120 and affect the internal functional circuit 120.

Therefore, the known electrostatic discharge circuit structure is still not ideal and there is room for improvement

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