Patent ID: 8164874
Filing Date: 2012-04-24
Classification: H02H,H02M,Y02B

Abstract:
1. An overvoltage protection device, comprising: an input configured to be connected to a first terminal of a power supply mains; an output configured to be connected to an electronic system to be protected; first and second bidirectional JFET field-effect semiconductor transistors of normally-on type, connected in series between the input and the output, fabricated in a wide-bandgap material and configured to operate in current-limiting mode; a resistor connected in parallel with the two transistors, wherein the resistor has a resistance value at least equal to in which U Imax is inductive current in the overvoltage protection device, and I and further comprising a bidirectional transil diode or a varistor connected at a first end to a point downstream of the first and second semiconductor transistors in parallel with the output, and directly connected at a second end, opposite to the first end, to a second terminal of the power supply mains, and wherein the resistor is connected between the drain of the first semiconductor transistor and the bidirectional transil diode or the varistor.