Protection of thyristors during turn-on

Details Protection of thyristors during turn-on Protection of thyristors during turn-on

H - Electricity

01

L

356/39

H01L 29/32 (2006.01) H01L 29/74 (2006.01)

Patent

CA 1298920

-1- Abstract: A thyristor having a main cathode 1 and an anode electrode 2 between which conduction occurs, also includes a region of long charge carrier lifetime 12. During forward conduction between the cathode 1 and anode 2, carriers diffuse into the region of long lifetime region 12. If, during reverse recovery, but prior to the thyristor recovery time, a positive going voltage ramp is applied across the device, turn-on is initiated in the long lifetime region 12 due to the presence of unrecombined charge and displacement currents generated The current produced is limited by resistors 9 and 17 to prevent damaging high levels and is used to switch on the remainder of the thyristor (via an amplifying gate) without any damage to the device occurring. In previous thyristors not including a region of long carrier lifetime, such a voltage might result in turn-on occurring over only a very small volume and the heat dissipated could destroy the thyristor.

572971

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