Research on IGBT Limit Frequency Based on Heat Balance Analysis

Insulated gate bipolar transistor (IGBT) is the most widely used fully-controlled power electronic device at present. Its limit frequency is generally determined by the maximum junction temperature and maximum power consumption given in the manual, and it is difficult to reflect the nature of thermal failure. Based on the thermal balance analysis of IGBT power consumption-temperature curve and heat transfer curve, the thermal stability point, unstable point and critical point of junction temperature are obtained, thus the IGBT limit power consumption at the critical point is obtained, the design method of IGBT limit frequency is obtained from the tangent of the two curves, and finally the experimental verification is carried out.