Patent ID: 7671415

Claim:
An electrostatic protection circuit, comprising: a first thyristor rectifier circuit electrically coupled to an internal circuitry, an external source voltage supply line that supplies an external source voltage to the internal circuitry, and an internal fixed voltage supply line that supplies an internal fixed voltage to the internal circuitry; a first current control circuit electrically coupled to the first thyristor rectifier circuit and an internal source voltage supply line that supplies an internal source voltage to the first internal circuitry, the first current control circuit restricting a current from flowing from the external source voltage supply line to the internal source voltage supply line through the first thyristor rectifier circuit when the external source voltage supply line becomes greater than the internal source voltage supply line, the first current control circuit making a surge current flow to the internal fixed voltage supply line through the first thyristor rectifier circuit by triggering the first thyristor rectifier circuit into a thyristor mode by means of the surge current applied to the external source voltage supply line in order to protect the first internal circuitry from the surge current.