Hi Yujian,
Thanks for your question.
The N-Channel IGBT block is a not an ideal switch block. It does require the use of a gate driver block to capture the non-linear turn on and turn off dynamics happening on the gate of the transistor.
Once you add a gate driver block from the library, you can connect the physical signal to the gate driver which then can be connected to the gate of the N-Channel IGBT block. See below.
