Electrostatic discharging protective circuit for extra-high voltage chip

Abstract

The invention discloses an electrostatic discharging protective circuit for an extra-high voltage chip. The electrostatic discharging protective circuit includes a power supply holdout module and at least one switch module. The power supply holdout module senses the electrostatic discharging current from a first high voltage end or a first low voltage end to generate control signals. The switch module includes a first resistor and a first power semi-conductor element, the first resistor is coupled between a first high-voltage end and a level shift circuit, the first power semi-conductor element is parallelly coupled to the first resistor, and the first power semi-conductor element is controlled by the control signals to enable the fist high voltage end to electrically connected with the grounding end of the level shift circuit via a first current transmitting path, wherein the level difference of the first low voltage end and the grounding end is greater than a first voltage critical value. The electrostatic discharging protective circuit provided can prevent circuit operated with a common voltage from being damaged.

Description

technical field [0001] The present invention relates to an electrostatic discharge protection circuit, and in particular to an electrostatic discharge protection circuit for ultra-high voltage wafers. Background technique [0002] Generally speaking, Electrostatic Discharge (ESD) current is one of the main problems that occur during the connection process of electronic products. In addition to the human body's touch that may cause the generation of electrostatic discharge current, electronic products themselves will also be caused by the accumulation of static electricity. And generate electrostatic discharge current. [0003] With the advancement of electronic products, consumers not only pay attention to the functions of electronic products themselves, but also if electronic products can be connected with various electronic equipment, it will help increase consumers' willingness to buy. For example, multi-functionalization and miniaturization have become the current desig...

AI Technical Summary

Problems solved by technology

However, in actual use, if there are more transmission interfaces, it is often easier to cause electrostatic discharge current to enter the electronic product through the transmission interface, and then interfere or damage the integrated circuit inside the electronic product.

[0004] In particular, when a part of the integrated circuit inside the electronic product operates in an ultra-high voltage environment, if the electrostatic discharge current in the ultra-high voltage environment is directly guided to a circuit with a normal voltage, it will easily cause many damages in the electronic product. Failure of circuits or electronic parts (such as receiving excessive current or overheating), causing electronic product manufacturers to suffer a lot of losses

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