RESEARCH
Design and Implementation of Interleaved Vienna Rectifier with Greater than 99% Efficiency
Year: 2015
Fig. 1. (a) Converter prototype.
Paralleling switches or converters are commonly used to achieve higher efficiency and better thermal management. In such practices, interleaving the gate signals of several sub-converters instead of simply gating them simultaneously can further enhance efficiency and power density. The cancellation effect among the interleaved sub-converters allows for smaller input filters. In other words, to achieve the same power quality with the same passive components, the switching frequency of each sub-converter in the interleaved systems can be lower, which lowers switching loss. Additionally, applying the interleaving technique may reduce EMI filter size due to its cancellation effect among sub-converters. Thus, the interleaved Vienna rectifier, which merges the advantages of the Vienna rectifier and interleaved systems in achieving high efficiency, is discussed.
In this paper, the design of a 3 kW, three-phase, two-channel interleaved Vienna rectifier with greater than 99% efficiency is presented. The converter efficiency is optimized for 230 V, 360~800 Hz input voltage, 650 V output voltage and 3 kW output power under a power quality requirement from a standard DO-160E. The operation principle of the interleaved Vienna rectifier is presented, with special attention given to circulating current generation and suppression. A comprehensive design procedure for the interleaved Vienna rectifier, including a design flow chart, loss estimation for the converter, design guideline of interphase inductors and semiconductor selection is described. A converter prototype is built and experiment results are shown, verifying the validity of the design procedure.
Fig. 1. (b) Experimental waveforms at nominal load
