Patent ID: 11876509
Assignee: INFINEON TECHNOLOGIES AG
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. A gate driver system, comprising:
a transistor configured to be driven between switching states wherein the transistor is configured to be turned off during each of a plurality of switching events;
a gate-controlled freewheeling diode coupled antiparallel to the transistor, wherein the gate-controlled freewheeling diode is configured to be turned on during each of the plurality of switching events;
a gate driver circuit coupled to a first gate terminal of the transistor and to a second gate terminal of the gate-controlled freewheeling diode,
wherein the gate driver circuit is configured to control a first gate voltage at the first gate terminal in order to drive the transistor between the switching states, wherein the gate driver circuit is configured to trigger a first transition of the first gate voltage from a first voltage level to a second voltage level during each of the plurality of switching events at a first trigger time, wherein the second voltage level is less than the first voltage level,
wherein the gate driver circuit is configured to control a second gate voltage at the second gate terminal in order to drive the gate-controlled freewheeling diode between conduction states, wherein the gate driver circuit is configured to trigger a second transition of the second gate voltage from a third voltage level to a fourth voltage level during each of the plurality of switching events at a second trigger time, wherein the fourth voltage level is greater than the third voltage level, and wherein the second trigger time is offset prior to the first trigger time by a desaturation time;
a measurement circuit configured to measure a transistor parameter indicative of a voltage slew rate of the transistor for a first turn-off switching event during which the transistor is transitioned from an on state to an off state; and
a control circuit configured to receive the measured transistor parameter and regulate a duration of the desaturation time based on the measured transistor parameter.