Comparison of switching power losses of fixed-frequency PWM, Hysteresis Control and Δ-Σ PWM

Abstract:
The electric range of an electric vehicle depends amongst others on the efficiency of electric components. This paper focuses on the efficiency of the inverter in one-phase and three-phase operation. A comparison of three different PWM patterns is presented concerning their efforts to minimize the switching losses of the inverter. For one-phase systems, we show that an appropiate switching strategy will decrease the switching losses by up to 33%. For three-phase systems, we find a lower efficiency gain, but argue how our methods might be combined with predictive control strategies.