ABB AI815 Analog Input Module 8 Channels

ABB AI815 Analog Input Module 8 Channels

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The same industrial power module as in the previous example is used in a motor drive inverter with intermittent operation and varying loadd per cycle. The first turn-on period of 10 s leads to a junction temperature rise from e.g. 85°C to 125°C in the IGBT. The following three turn-on periods of 0.5 s each lead to junction temperature rises from 85°C to 105°C in the IGBT. The “off” period between each load period exceeds 2 s. 

The cycle time of this load train is 60 s. This results in a junction temperature swing of ∆Tvj=40 K for the first pulse and 3 times a swing of ∆Tvj=20 K per cycle. The upper diagram in Figure 4 shows 2.3 million cycles at ∆Tvj=40 K and Tvjmax=125°C. Due to the turn-on period of ton=10 s, the value has to be multiplied with a correction factor of 0.57 from the bottom diagram in Figure 4. This results in a lifetime of 1.3 million power cycles. So far, this is the same result as in example 1. But further load periods have to be considered as well. In the PC diagram, there are 450 million cycles for ∆Tvj=20 K. With a load period of ton=0.5 s, the value has to be multiplied with a correction factor of 1.39. This results in an estimated lifetime of 626 million pulses. 

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