Patent ID: 9634483
Date: 2017-04-25
CPC Classifications: H01L,H02H

Claim:
1. An electrostatic discharge protection circuit, comprising: a main electrostatic discharge (ESD) circuit, coupled between a first rail and a second rail, and having a control end, wherein the main ESD circuit is arranged to establish an electrical connection between the first rail and the second rail based on a voltage of the control end; a voltage detection circuit, coupled between the first rail and the second rail for setting the voltage at the control end when a voltage of the first rail is greater than a limiting voltage, thereby driving the main ESD circuit to establish the electrical connection between the first rail and the second rail; and an electrostatic driving circuit, coupled between the main ESD circuit and the control end for setting the voltage at the control end when an instant variation of the voltage at the first rail is greater than a predetermined value, thereby driving the main ESD circuit to establish the electrical connection between the first rail and the second rail, wherein the main ESD circuit, the voltage detection circuit and the electrostatic driving circuit are connected in parallel connection between the first rail and the second rail, and wherein the voltage detection circuit comprises: