Hidden dc-link ac/ac converter using bilateral power switches and motor drive embodying the same

Abstract From the Canadian patent

The invention resides in providing bilateral switches between the respective phase lines of an AC input source and a common phase line of an AC output to form a phase line group of said bilateral switches on each AC output line; in fact, controlling the bilateral switches of each group so as to generate with AC input lines a DC link voltage with respect to the associated AC output line and, secondly in controlling the bilateral switches in such group to modulate such DC link voltage in relation to a desired AC voltage for such associated AC output line each, of said groups being operated with a corresponding phase shift to provide a corresponding phase shift between the respective output …