A study on IGBT junction temperature (Tj) online estimation using gate-emitter voltage (Vge) at turn-off
We propose a novel method to enable online estimation of IGBT junction temperature. Miller plateau width in Vge waveform depend linearly on IGBT junction temperature. A measurement circuit was implemented at gate level to measure Miller plateau width. A model has been proposed to extract junction temperature from Vge measurements. IGBT module with two chips at different temperatures was analyzed using Vge method.
igbt junction temperature gate-emitter voltage miller plateau lifetime estimation temperature-sensitive electrical parameters