Title :
Slope modulation in inverter circuits
Author :
Salmon, John C. ; Hagan, Daniel
Author_Institution :
Dept. of Electr. Eng., Alberta Univ., Edmonton, Alta., Canada
Abstract :
Slope modulation is discussed as a means of voltage control in inverter circuits. The mark and space intervals of the pulse-width modulation (PWM) waveform are generated by controlling the slopes of a triangular carrier waveform. This slope modulation scheme, when implemented with a square-wave reference waveform and a constant volts/hertz ratio, produces a linear relationship between the fundamental frequency and the frequency ratio. The constant volts/hertz ratio is useful in such applications as variable-speed motor drives. The adopted three-phase PWM technique results in a constant current harmonic distortion at all frequencies.<>
Keywords :
electric motors; invertors; pulse width modulation; variable speed drives; PWM; constant volts/hertz ratio; current harmonic distortion; inverter circuits; mark and space intervals; pulse-width modulation; slope modulation; square-wave reference waveform; triangular carrier waveform; variable-speed motor drives; voltage control; Chirp modulation; Circuits; Frequency; Harmonic distortion; Motor drives; Pulse generation; Pulse width modulation; Pulse width modulation inverters; Space vector pulse width modulation; Voltage control;
Conference_Titel :
Industry Applications Society Annual Meeting, 1989., Conference Record of the 1989 IEEE
Conference_Location :
San Diego, CA, USA
DOI :
10.1109/IAS.1989.96733
