CPC H02H 9/046 (2013.01) | 14 Claims |
1. An electrostatic discharge (ESD) protection circuit, comprising:
an ESD protection module, arranged inside a protected chip and connected to a protected circuit; and
a control module, connected to the ESD protection module and configured to output a low-level signal to the ESD protection module to trigger the ESD protection module to discharge an electrostatic current when an ESD event occurs in the protected chip, and output a high-level signal to the ESD protection module to reduce a static leakage current of the ESD protection module when the ESD event does not occur in the protected chip; and, wherein the ESD protection module comprises:
a silicon controlled rectifier, having an anode, a cathode, and a trigger terminal, wherein the control module is connected between the anode and the cathode of the silicon controlled rectifier; and
a diode string, comprising a plurality of diodes connected in series, wherein an anode of the diode string is connected to the trigger terminal of the silicon controlled rectifier, a cathode of the diode string is connected to the control module; when the ESD event occurs in the protected chip, the control module outputs a low-level signal to the cathode of the diode string to trigger the silicon controlled rectifier to discharge the electrostatic current and when the ESD event does not occur in the protected chip, the control module outputs a high-level signal to the cathode of the diode string to reduce a voltage drop across the diode string.
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