A Novel PWM for Harmonic Reduction and its Application to ac-dc Converters

Abstract

The paper describes a novel PWM scheme called inverted-sine PWM (ISPWM) which uses a sinusoidal reference and an inverted-sine carrier. The ISPWM, when applied to a rectifier, has a better harmonic elimination and a higher average output voltage compared to a sine PWM (SPWM). The harmonic content of the ISPWM output for different values of the modulation index is computed and compared with that of a SPWM. The complete circuit for generating the ISPWM control signal for single and three phase ac-dc converters is developed. Experimental waveforms of voltages and currents are presented.

Indexing terms:

• PWM
• Harmonic reduction
• ac-dc converter

Additional information

Notes on contributors

S Yuvarajan

S Yuvarajan, received his MTech and PhD degrees from Indian Institute of Technology, Chennai (Madras), India in 1969 and 1981 respectively. He was with the Department of Electrical Engineering at the Indian Institute of Technology from 1974 to 1983. He Joined the Department of Electrical and Computer Engineering, North Dakota State University, Fargo, in 1983, where he is currently a Professor. His research interests include high-performance power supplies and power semiconductor devices.

Abdollah Khoei

Abdollah Khoei, was born in Urmia, Iran, in 1957. He received BS, MS and PhD degrees in electrical engineering from North Dakota State University, USA, in 1982, 1985, 1989, respectively. His research interests are analog and digital integrated circuit design for fuzzy logic and neural networks applications, and applications fo fuzzy logic in indusrial electronics. He is currently with Electrical Engineering Department and Microelectronics Research Laboratory in Urmia University, Urmia, Iran.