Interface anti-static method, anti-static protection circuit and electrical equipment

Abstract

The invention discloses an interface anti-static method, an anti-static protection circuit and electrical equipment. The circuit comprises a point discharge part, a photoelectric element and a current buffering unit, wherein the point discharge part is connected with an equipment interface and breaks down the air between the point discharge point and the reference ground in the equipment to discharge and generate light energy when the static voltage higher than the set first voltage threshold occurs at the equipment interface; the photoelectric element is matched with the point discharge part, acquires the light energy generated by the point discharge part, and generates breakdown current to control a switching element connected with the photoelectric element to disconnect a current path between the equipment interface and a protected component; and one end of the current buffering unit is connected with the point discharge part, the other end of the current buffering unit is connected with the switching element, and the current buffering unit is used for extending the arrival time of the current from the equipment interface to the protected component to ensure that the switching element can be disconnected before the static current arrives. The point discharge part is matched with the photoelectric element to prevent the protected component from being damaged by higher staticvoltage, the component with protective effect can not be damaged when the voltage is discharged, and the cost investment of static protection is saved.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to an interface antistatic method, an antistatic protection circuit and electrical equipment. Background technique [0002] The rapid discharge of charge when the charge accumulates to a certain intensity on the surface of the material is called Electrostatic Discharge (ESD). Electrostatic discharge usually produces a large peak pulse current in an instant. Therefore, if electrostatic discharge occurs on electronic components, it is likely to have a destructive effect on its own circuit, which may cause electronic component circuit noise and temporary abnormalities. It may also cause permanent damage to the circuit and make it unusable. [0003] The existing circuit design to prevent electrostatic discharge is to add various protection devices on the signal line of the external interface of the chip to protect the components. The anti-static treatment methods mainly inc...

AI Technical Summary

Problems solved by technology

[0008] The embodiment of the present invention provides an interface anti-static method and an anti-static protection circuit, which are used to solve the problem that in the prior art when the interface is anti-static through an external protection circuit, the components can only be used once, the cost of hardware implementation is high, and the components can be protected. Low electrostatic voltage and other issues

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