ABSTRACT
Traditional methods of AC/AC converters have been introduced in Chapter 11. All those methods have some general drawbacks: the output voltage is lower than the input voltage; the input-side total harmonic distortion (THD) is high; and the output voltage frequency is lower than the input voltage frequency when voltage regulation and cyclo-conversion methods are used. Some new methods to construct AC/AC converters can overcome the above-mentioned drawbacks. The following converters are introduced in this chapter: DC-modulated single-phase single-stage AC/AC converters; DC-modulated single-phase multistage AC/AC converters; DC-modulated multiphase AC/AC converters; sub-envelope modulation method to reduce the THD for matrix AC/AC converters.
