The invention discloses a switched switch
capacitor type AC-AC converter with the fixed
transformation ratio of 1 / 4 or 4. The switched switch
capacitor type AC-AC converter comprises seven capacitors and eight power switch sets, the eight power switch sets are sequentially connected in series, each power switch set comprises two power switch tubes, and the source electrodes of the power switch tubes are connected in series. The two ends of two connected adjacent power switch sets in series are both connected with the capacitors, and a
driving circuit is connected with the grid
electrode of each power switch set. When the
voltage of the converter drops, the input end of the converter is connected to the two ends of the eight power switch sets, and the output end is connected to the two ends of any
capacitor. When the
voltage of the converter rises, the input end of the converter is connected to the two ends of any capacitor, and the output end is connected to the two ends of the eight power switch sets. According to the switched switch capacitor type AC-AC converter, only the capacitors serve as
energy storage elements, magnetic elements are not arranged, the input and output fixed
transformation ratio is 1 / 4 or 4, the size of the converter is reduced, and the switched switch capacitor type AC-AC converter has the advantages of being low in equivalent
internal resistance, high in
power density, small in size, light in weight, high in power efficiency and the like.