Effects of the number of สevels in multi-levels PWM on the signal quality

Abstract

This article presents simulation results of multi-levels PWM system. The experiment varies the number of the levels including 2, 3, 5, 7, 9, and 11 levels each at 4 different carrier frequencies i.e. 150 kHz, 200 kHz, 250 kHz, and 300 kHz. The suitable level number and carrier frequency is then found by comparing the quality of the output signal of the system at the various settings. From the simulation results, the optimal parameter is 5 multi-levels PWM at 200 kHz carrier frequency.