Optimum PWM Waveform Synthesis---A Filtering Approach

A fundamentally different approach is proposed for the synthesis of optimum pulsewidth modulated (PWM) waveforms for high-power inverter applications. Conventional optimum PWM waveform synthesis techniques which seek to control harmonic levels in the inverter output directly are seen to be equivalent to a filtering operation. Digital filter structures capable of processing PWM waveforms are examined and waveform synthesis strategies are proposed and verified experimentally. Finally, the design of a high-performance PWM waveform generator is detailed.