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Analysis of PWM Frequency Control to Improve the Lifetime of PWM Inverter

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3 Author(s)
Lixiang Wei ; Allen-Bradley, Rockwell Autom. Inc., Mequon, WI, USA ; McGuire, J. ; Lukaszewski, R.A.

Studies show that the power cycling mean time to failure (MTTF) of the insulated-gate bipolar transistor (IGBT) bond wire in an adjustable speed drive may be very short under some very common conditions. This paper proposes a switching frequency reduction method based on the junction temperature variation (ΔTj) of an inverter IGBT. It has the following advantages. First, it reduces the pulsewidth-modulation frequency under low-speed higher torque condition. Second, the inverter is started more smoothly and safely under higher command switching frequency and high-torque condition. Third, the overall MTTF of the inverter IGBT can be improved. The theory analysis, simulation, and experimental result are provided to show these advantages.

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Industry Applications, IEEE Transactions on  (Volume:47 ,  Issue: 2 )