Apparatus and method for eliminating or reducing to a filterable minimum the relevant harmonic frequencies which otherwise occur in an AC output voltage from a multi-phase static inverter circuit operating from a symmetrically notched source of DC input voltage. The inverter circuit is electronically...http://www.google.ca/patents/US5212629?utm_source=gb-gplus-sharePatent US5212629 - Voltage and harmonic control of a multi-pole inverter
