Compensation of Inconsistencies in Junction Temperature Deviation during Power Cycling Tests

Abstract:
In Power Cycling Tests (PCT), same device under identical testing conditions may exhibit different junction temperature deviation DeltaTvj which would affect the assessment of the device. This article analyzed the inconsistency in DeltaTvj among devices in serial power cycling topology. Subsequently, a compensation method based on adjusting the gate voltage through iterative fitting is proposed to address this imbalance. Then this paper analyzed the method’s impact on junction temperature (Tvj) measurements and proved its robustness through experimentation. Finally, compensation on the junction temperature deviation was conducted on different power modules in PCT to validate the feasibility of the method.