Over-modulation associated to flash memory based multi-optimal PWM for three-phase inverters

This paper further develops the concept of very large size flash-memory-based pulse-width-modulation (PWM) with the implementation of an over-modulation algorithm for a three-phase inverter. The compensation of voltage for linearization is incorporated within the same flash memory with a multi-optimal PWM generator. Using flash memory demonstrates a low cost alternative to advanced processors. This approach is proposed to solve the contradiction between the requirement for advanced DSP processors able to control the nonlinearity over the two possible operation modes at over-modulation and the low-cost goal of low-power drives where the DC bus has limited voltage and over-modulation is mandatory. Analytical demonstration of over-modulation and the detailed design of PWM generator complete the paper.