Patent ID: 10389111

Abstract:
This electrostatic protection circuit enables a high hold voltage to be set, and acts to accurately prevent breakdown of a protected circuit immediately after power on, and to prevent breakdown or deterioration of a protection device during prolonged normal operation, without connecting a resistance element in parallel to a plurality of circuit blocks connected in series. This electrostatic protection circuit is provided with a plurality of circuit blocks connected in series between a first node and a second node, at least one circuit block out of the plurality of circuit blocks including a thyristor having an anode connected to one end of the at least one circuit block and a cathode connected to the other end of the at least one circuit block. When the potential of the first node is higher than the potential of the second node during normal operation, the voltage between both ends of the other circuit blocks out of the plurality of circuit blocks is smaller than the voltage between the anode and the cathode of the thyristor.