Online Monitoring of IGBT junction Temperature Based on Vce Measuremnt

In this paper, an online monitoring method of IGBT junction temperature based on Vce measurement is proposed. An on-state voltage measurement circuit (OVMC) with high accuracy and high blocking voltage capability is designed. The relationships between Vce(on), Tj and Ic are found based on the method of solving regression problems and a three phase invertor is designed to verify the temperature monitoring method. The method proposed in this paper can be easily extend to a complex system and can provide a novel approach for junction temperature monitor.