Comparison based selective harmonic elimination using a modified reference signal

摘要

A novel method has been proposed where selective harmonic elimination is achieved by comparing a modified reference signal against a high frequency carrier. A triangular or sinusoidal carrier can be used in its implementation. Unlike other selective harmonic elimination techniques, no on-the-fly signal processing is necessary. The tunability feature is similar to that of sine-triangle PWM generator and easy for implementation. The method allows maintaining a desired fundamental strength while eliminating unwanted harmonics, thereby improving SNR and lowering THD. Simulation and laboratory studies are provided to support the proposed approach.