If the G-pin is working normally, it is generally between 0-15V or -5V-15V; -5V is for complete shutdown or not; Here generally refers to the voltage between GS; D is probably the same level as S when it is on, and may be high when it is not on; The waveform of D is very close to that of G; After all, G is driving D; S is generally grounded; The simple connection is ground; The method of determining GSD is very simple, look at the drive circuit can see, generally D connected to the coil or power supply; S junction; G to a signal driven output; Of course, I am not familiar with induction stoves, I just want to make some explanations about IGBTs.