Patent ID: 9412853
Filing Date: 2016-08-09
CPC Classification: H01L,H02H,H03K

Claim Text:
1. A protective device for a voltage-controlled semiconductor switch having a gate connection, a power emitter connection, an auxiliary emitter connection and a collector connection, wherein the voltage-controlled semiconductor switch can switch a current between the collector connection and the power emitter connection, the protective device comprising: a voltage-limiting device for limiting a voltage between the gate connection and the power emitter connection; and a deactivation device connected to said voltage-limiting device and deactivating said voltage-limiting device during a switch-on of the voltage-controlled semiconductor switch, said deactivation device having at least one timing element, wherein a time constant of said timing element at least also determines a duration of a deactivation of said voltage-limiting device after a sudden change in a gate-auxiliary emitter voltage.