Four-quadrant AC-AC converter applied by integrated-voltage-control method

Authors propose the four-quadrant AC-AC converter applying the integrated-voltage-control method. This AC-AC converter outputs variable single-phase AC voltage like a variable ratio transformer. It has been confirmed that this AC-AC converter can drive all types of load for example an R-L load or an R-C load and has no error between the average output voltage and its setting voltage and has a quick response, in spite of simple central circuit