Cascading type switched capacitor type AC-AC converter for achieving any depressurization transformation ratio

• Main Authors: WANG WEI, CAI HUI, BAO LITING, CHEN WEIMIN, YOU JIACHUAN
• Format: Patent
• Language: English
• Published: 15.07.2015
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

The invention discloses a cascading type switched capacitor type AC-AC converter for achieving any depressurization transformation ratio. A plurality of basic unit circuits for achieving any input/output K/N transformation ratio are cascaded in sequence, each basic unit circuit is composed of a capacitor and a plurality of power switch sets which are sequentially connected in series, each power switch set comprises two power switch tubes with sources connected in series, a capacitor is in parallel connection to each of the two ends of a part formed by connecting any two adjacent power switch sets in series, and a driving circuit is connected with grids of the power switch tubes. The two ends of the part formed by connecting all power switch sets in the next basic unit circuit are connected to the two ends of any part formed by connecting a plurality of capacitors in the last basic unit circuit in series. According to the cascading type switched capacitor type AC-AC converter, a cascading mode is adopted for achieving voltage output of different gears with any depressurization transformation ratio, and the cascading type switched capacitor type AC-AC converter can be applied to design of other fixed gear speed regulating; only the capacitors serve as energy storage elements, and magnetic elements are not included, so that the size of the converter is reduced, the equivalent internal resistance is small, changes are basically avoided along with increase of the basic unit circuits, and the power density is high.