Effect of the high input capacitance of 1200 V trench IGBT on the switching characteristics under inductive load

Abstract

In this study, we focus on the effect of the input capacitance of 1200 V Trench (T) IGBT on the switching waveforms under clamped inductive load. For a given gate resistance, due to the trench gate oxide structure, the trench device presents a higher input impedance than the planar (P) IGBT, which is responsible for a high switching time during turn-on. In the case of the trench device, whereas the gate voltage waveforms are relatively usual, the collector current waveforms are strongly modified compared to the planar device. The influence of the gate resistance value on the switching waveforms during turn-on and turn-off is analyzed in details with the help of experimental data. Some additional results allowing to see the influence of the dv/dt and based on simulation are also presented