Patent ID: 11881845
Assignee: SIEMENS AKTIENGESELLSCHAFT
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 4:
5. A circuit arrangement, comprising
a semiconductor switch having a gate,
a gate driver controlling the gate, the gate driver comprising
an electronic switching unit controllable by a driver voltage of the gate driver,
a switch-on gate resistor connecting the gate to a switch-on potential to switch on the semiconductor switch, and
a switch-off gate resistor connecting the gate to a switch-off potential to switch off the semiconductor switch, and

a protective circuit connected to the gate in parallel with the gate driver,
the protective circuit comprising
a damp diode;
a PNP bipolar transistor, comprising an emitter connected to a cathode of the damp diode
an NPN bipolar transistor comprising a collector connected to a base of the PNP bipolar transistor and a base connected to a collector of the PNP bipolar transistor,
a first resistor connected in parallel with the base-emitter path of the NPN bipolar transistor,
a second resistor comprising a first terminal connected to the base of the PNP bipolar transistor,
a capacitor connected in parallel with a base-emitter path of the PNP bipolar transistor, and
a third resistor connected either in parallel with the capacitor or with a first terminal of the third resistor connected to the emitter of the PNP bipolar transistor and a second terminal connected to a second terminal of the second resistor.