Discussion
An IGBT switching 400 A at 600 V with a total switching energy of 40 mJ per event, at 4 kHz, dissipates in switching
Answer: C
Correct answer: 160 W
Switching loss is the energy per event multiplied by the number of events per second: \[ 40 \times 10^{-3} \times 4000 = 160\ \mathrm{W}. \] Note that it is proportional to frequency, which is the fundamental constraint on how fast an inverter may be switched - the harmonic benefit of a higher frequency is paid for in heat.
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