Abstract
Analytical results are given concerning the spectral errors produced when a sinusoidal 3-level PWM (3–1 PWM) waveform is realized by means of an inverter. Four error producing mechanisms are considered here, namely the commutation rise and fall times, the commutation timing errors, and the amplitude distortion errors. It has been demonstrated in this paper that the first three kinds of errors are fully described by means of appropriate 2–level time constraint pulse position modulation (2–1 TC-PPM) impulse trains associated with the impulses occurring at the leading and trailing edges of the 3–1 PWM signals. The different kinds of spectral errors are analysed by means of a unified approach. It has been shown that spectral errors can be produced at the output of a filter, with a specific transfer function, when appropriate 2–1 TC-PPM signals are applied to the filter. It has been deduced via the analytical expressions that under certain conditions considerable harmonic error components appear in the output waveform spectrum as a result of spectral errors.
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