The temperature of the photovoltaic inverter IGBT module is too high

Why do IGBT power inverters fail?

IGBT power modules’ high generated power losses convert to heat and raise temperature strains, particularly the junction temperature of the module. IGBT module failures are a critical worry for the dependability of power inverters since these temperature stressors have a substantial impact on the operation of such electronic components [4, 5, 6].

How does temperature cycling affect IGBT power modules?

Different power losses, including conduction, switching, and thermal power losses, introduce temperature cycling during the operation of an IGBT power module [31, 32], and this temperature cycling profile weakens the properties of the IGBT module and shortens its useful lifetime.

Why do IGBT modules have a high reliability?

The power losses generated in the IGBT module were often converted to heat, raising the module temperature, particularly the switch junction temperature. Therefore, to ensure the high dependability of the design and module selection before the manufacturing process.

What causes high power density IGBT modules to fail?

Excessive temperature stresses caused by excessive power losses frequently cause high-power-density IGBT modules to fail.

Are all IGBTs specified over temperature?

All IGBTs are specified over temperature. As a convenient point of reference, the datasheets include the maximum continuous collector current at 80 degC case temperature. This is a good starting point for choosing the right module given the maximum RMS phase current of the machine.

How do IGBTs work in a PV inverter?

During operation inside a PV inverter, IGBTs are subject to AC stress conditions as opposed to DC stress conditions. This typically consists of a 60 Hz on-off cycle, with a Pulse-Width-Modulated (PWM) signal on the order of 10 – 15 kHz superimposed on the lower-frequency cycle.