Title :
Aliasing effects in PWM power converters
Author :
Verghese, George C. ; Thottuvelil, V. Joseph
Author_Institution :
MIT, Cambridge, MA, USA
Abstract :
Perturbation of the control signal or input source voltage in a basic pulse-width-modulated converter running open-loop under voltage-mode control is shown to give rise to several aliased components in the output voltage response. By using switched-circuit simulation to generate circuit waveforms and then analyzing their spectral content using FFTs, we obtain a variety of results illustrating the phenomenon. These results, along with the analysis used to explain them, reinforce the cautions raised in earlier papers by G.C. Verghese et al. (1991, 1997) regarding the limitations of small-signal frequency-response information in frequency ranges where aliasing is significant
Keywords :
PWM power convertors; fast Fourier transforms; frequency response; spectral analysis; voltage control; FFT; PWM power converters; aliasing effects; circuit waveforms; control signal perturbation; input source voltage; open-loop; output voltage response; pulse-width-modulated converter; small-signal frequency-response information; spectral content; switched-circuit simulation; voltage-mode control; Analytical models; Circuit simulation; Flexible printed circuits; Frequency; Open loop systems; Pulse width modulation; Pulse width modulation converters; Spectral analysis; Switching circuits; Voltage control;
Conference_Titel :
Power Electronics Specialists Conference, 1999. PESC 99. 30th Annual IEEE
Conference_Location :
Charleston, SC
Print_ISBN :
0-7803-5421-4
DOI :
10.1109/PESC.1999.785640
