Patent ID: 11874341
Assignee: HEFEI UNIVERSITY OF TECHNOLOGY
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 2:
3. The method for monitoring the online state of the bonding wire of the IGBT module according to claim 2, wherein a specific method for establishing the three-dimensional model of the health IGBT in the step 2 comprises:
simulating an environment temperature by adjusting a working temperature of a high-low temperature experimental box, wherein an environment temperature variation range simulated of the high-low temperature experimental box is 30-130° C., and controlling a forward on current variation range of the IGBT power module to be 20-60 A by changing the load of the full bridge inverter circuit; the IGBT power modules on the four bridge arms of the full bridge inverter circuit being healthy IGBT power modules, placing one of the healthy IGBT power modules in the high-low temperature experimental box, connecting the healthy IGBT power module in the full bridge inverter circuit after the environment temperature is stable, and measuring a saturation voltage drop of the IGBT power module in the full bridge inverter circuit once at an interval of 2 A of the forward on current of the IGBT power module when the environment temperature simulated in the high-low temperature experimental box is at an interval of 5° C.; and performing surface fitting on a three-dimensional array (Ta,Ic,VCE) by using a cftool tool box in Matlab to obtain a saturation voltage drop curved surface of the healthy IGBT power module, wherein Ta represents the environment temperature simulated by the high-low temperature experimental box, Ic represents the forward on current of the IGBT power module, and VCE represents the saturation voltage drop of the IGBT power module.