As the application of high power inverters in the MW level is typical for railway traction industry, the failure of module can cause fractures sprayed. The extreme consequences may involve main busbar short-circuit, damage the gate control circuitry and others.
One of failures is module explosion during the operation in the filed or even at test bench. The high power module explosion can cause direct damages and huge influences to surrounding systems or even cause safety problems depending on its application scenario [1-3]. 1. Introduction
The anti-explosion capability or minimise-damage capability of high power IGBT modules is key consideration element to decide on the converter or inverter equipment reliability in the extreme scenario. Test methods and experimental results on case rupture capability have been introduced in several papers [2-5].
To drive the explosion test, high DC voltage is applied with charging energy into DC capacitors fixed in the red box as shown in Figure 2, then gate drive control circuit to start the short-circuit test mode and discharge the stored energy from DC capacitor into the tested modules at ~10kJ level as stated in other reference . Figure 3.
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