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

Claim 0:
1. A protective circuit for a semiconductor switch, with the semiconductor switch having a gate controllable by a gate driver and connected to the gate in parallel with the gate driver, the protective circuit comprising:
a clamp diode,
a PNP bipolar transistor, comprising an emitter connected to a cathode of the clamp 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.