| Abstract |
This paper presents a test bench for lifetime investigation of 10 kV silicon carbide power modules.The test bench subjects high voltage switching operation to the modules while power cycling.Thus both a thermal and electrical operating point is emulated. The power cycling setup featuresof!line measurement of on-state voltages and direct real-time measurement of die surface temperatures,enabled by fiber optical sensors, which are built into the power modules. A thermalmodel of the module prototypes, based on the temperature measurements, is established. Independentverification steps have been made to validate the performance of the on-state voltagemeasurement and the thermal model. Issues are revealed in the form of common mode currentsin gate drive supply, which should be remedied. Finally a new operating point for power cyclingis suggested to better stress the power modules. |
