the paper proposes a novel AC-AC converter based on the Switched-Capacitor principle, which can achieve a ratio of 1/4. Its circuit topology and the conversion principle of the details are given in this paper. Based on the theoretical analysis, a simulation model was established to simulate the circuit topology. A switching frequency of 50 kHz 500W 220V/55V prototype converter has been designed to carry out the experiment. Both simulation and experimental results demonstrate the feasibility and effectiveness of the topology.

Abstract:Based on the existing AC-AC switched-capacitor (SC) converters, this paper demonstrates a new cascaded AC-AC converter circuit topology with a ratio of 1/2 n , which only consists of power switches and capacitors. The converter consists of multi-stage converters and the pre-and post-stage circuits are independent with each other. The principle of the topology and the formula of related parameters, including equivalent resistance, equivalent capacitance and switching loss, are deduced with the port network theory, thus the equivalent circuit is gained in this paper. After the theoretical analysis, simulation models and experimental prototype were established to validate the correctness of the circuit topology. Both simulation and experimental results have verified the effectiveness of the circuit topology and the correctness of the theoretical derivation.