Low Switching PWM Strategy Using a Carrier Wave Regulated by the Slope of a Trapezoidal Modulator Wave

• Published in: IEEE transactions on industrial electronics (1982) Vol. 56; no. 6; pp. 2270 - 2274
• Main Authors: Vargas-Merino, F., Meco-Gutierrez, M.J., Heredia-Larrubia, J.R., Ruiz-Gonzalez, A.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.06.2009; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Carrier waves; Commutation; Commutation losses; Electric potential; Frequency synchronization; Harmonic analysis; harmonic distortion; Induction generators; induction motor drive; Modulation; Modulators; Proportional control; Pulse duration modulation; Pulse width modulation; Pulse width modulation inverters; pulsewidth modulation (PWM); PWM inverters; quality voltages; signal quality; slope PWM (SLPWM); Space vector pulse width modulation; Strategy; Switches; variable frequency; Voltage; Voltage control
• ISSN: 0278-0046; 1557-9948
• DOI: 10.1109/TIE.2009.2014901

A simple and novel pulsewidth modulation (PWM) technique is presented. It uses a trapezoidal modulator wave and a sinusoidal carrier signal with variable frequency. The instantaneous frequency of the carrier wave is proportional to the slope of the modulator signal, and only two parameters (the slope of the trapezoidal edges and the proportionality constant of the carrier wave frequency) allow one to control the output voltage level and the number of commutation per cycle in real time. The proposed technique generates high-quality voltages with very few commutations per cycle, and it is particularly appropriate for reducing commutation loss. Results are checked experimentally and compared to other PWM techniques, yielding better signal quality with an important reduction in the number of commutations.