Patent ID: 9148015
Filing Date: 2015-09-29
Classification: H02H

Abstract:
1. A protection circuit, comprising: a first power terminal to receive a high potential voltage; a second power terminal to receive a low potential voltage, a circuit to be protected being connected between the first and the second power terminals; a control circuit connected between the first and the second power terminals which outputs a control signal when a voltage between the first and the second power terminals exceeds a predetermined threshold value; a shunt transistor having a current channel between the first and the second power terminals, the shunt transistor having a conductive state thereof controlled according to the control signal; and an asymmetric current transfer device, including a PN junction reverse-biased by a power voltage between the first and the second power terminals, the current channel of the shunt transistor and the asymmetric current transfer device being connected in series between the first and the second power terminals and in parallel to the circuit.