Techniques for SPWM using LUTs on low-cost microcontrollers

This paper examines the techniques which can be used to generate sinusoidal pulse width modulation (SPWM) utilizing minimal resources of a low-end microcontroller. Different techniques are evaluated, bit-banging look-up table (LUT) routines are advocated for certain purposes, programming algorithms are considered for efficiency, and methods of harmonic suppression are reflected upon. Finally, feedback methods are considered and a practical application is presented. This paper is targeted towards inverter and motor drives operating in H-bridge configuration. Microcontroller based voltage source inverters.