Design and Analysis of a Fibonacci Switched-Capacitor DC-AC Inverter

Abstract

For small power applications, a Fibonacci switched-capacitor (SC) DC-AC inverter is proposed in this paper. Unlike common DC-AC inverter containing inductors or transformers, the proposed inverter requires no magnetic components. In the proposed inverter, bi-directional switches are controlled so that the voltage ratio of capacitors becomes the ratio of a Fibonacci number. By combining some of these capacitors in series, the proposed inverter generates a staircase AC waveform formed by many steps. Therefore, unlike the conventional SC DC-AC inverters based on a series-parallel type converter, the proposed inverter can provide the staircase AC waveform by a smaller number of capacitors. The theoretical analysis and simulation program with integrated circuit emphasis (SPICE) simulations show the effectiveness of the proposed inverter.