Pulse-Width-Modulation Techniques: A Review

Abstract

Pulse-width-Modulation techniques are used for, harmonic elimination and/or reduction at the output of the inverter and simultaneously achieving the output voltage control. Microprocessor based implementation offers many advantages hence stress is to develop PWM techniques so that on-line microprocessor based implementation is easily possible. Different PWM techniques like Square-Wave, Sinusoidal, Regular-Sampled, harmonic elimination PWM and the Regular-Sampled Harmonic-Elimination PWM are the available options for a designer. Depending on the requirements, a suitable PWM scheme is selected. This paper reviews these PWM techniques in details. Their theoretical development and harmonic plots (Harmonic amplitudes versus Modulation index) are presented. The paper also compares all the PWM schemes.

Indexing terms:

• PWM techniques
• Carrier based PWM
• Harmonic elimination PWM
• Modulation index

Additional information

Notes on contributors

R M Jalnekar

R M Jalnekar, is presently working as Professor and Head of the Computer Engineering at BVCOE Pune. He obtained BE (E&T/C) and ME (E&T/C) from GCOEP Pune. He worked as R&D Engineer at DB- Electronics Pune and was Technical-Director of Micro-Power-Systems Pune. He worked as Assistant-Professor and taught courses on Power-Electronics for last ten years at BVCOE Pune.

He has worked on UPS-system, IGBT-based Motor-Drives, SMPS and PWM-Converters. He is a consultant to many small-scale industries. He has published several papers and books on Power-electronics. His field of interest includes PWM-Techniques and signal- processing. Presently he is working for his PhD in Power- Electronics and likely to submit the thesis in Feb 2000. He is a life Member of IETE, ISTE and BMESI.

K S Jog

K S Jog, is working as Professor and Head, Electronics and Telecommunication Department, Govt College of Engineering Pune. She obtained her PhD degree from Pune University. She is a Life member of ISTE, a Life fellow of IETE and a member of IEEE. Her areas of interest include Modelling, Image Processing and Networking.