A 600-W Switched-Capacitor AC-AC Converter for 220 V/110 V and 110 V/220 V Applications

This letter proposes an ac-ac converter based on the switched-capacitor principle. The new topology is described, analyzed, designed, and tested in the laboratory. The converter characteristics at the frequency of the input voltage and at the switching frequency are described herein. The absence of magnetic elements and the stress voltages in all components equal to half the input voltage are the main advantages of the proposed ac-ac converter. In order to demonstrate the performance of this converter a design example and experimental results for a prototype of 600 W, 220 V-rms high-side voltage, 110 V-rms low-side voltage, and switching frequency of 50 kHz are reported herein. The maximum and nominal efficiencies obtained were 95.6% and 90.6%, respectively.