Capacitively Isolated Multicell Dc-Dc Transformer for Future Dc Distribution System

Abstract

This paper proposes a new capacitively isolated multicell dc-dc transformer (dcx). The proposed dcx consists of dc-dc cell converters with pairs of isolation capacitors that substitute for high frequency transformers. The capacitively isolated cell converter achieves higher efficiency compared with the conventional inductively isolated dc-dc converter because of no transformers. The multicell approach also accomplishes the various voltage transformation ratios based on the input-series-and-output-parallel and input-parallel-and-output-series connections of the cell converters, overcoming the drawback of the capacively isolated converter with the fixed voltage transformation ratio. The analysis of the isolation voltage-sharing across the capacitors was conducted to show the feasibility of the proposed multicell dcx. The prototype of the 96 V-24 V, 200 W dcx using two 48 V-24 V, 100 W capacitively isolated dc-dc cell converters was also fabricated to confirm the validity of the analysis. The proposed approach contributes to the achievement of highly efficient and scalable power converters to realize future low-carbon societies.

Stability study and dynamical analysis of the multicellular chopper

“…Multicells converters have grown from an attractive theoretical concept to industrial applications, especially for use in higher power applications (Erickson and Maksimovic, 2001;Dargahi et al, 2014;Meynard and Foch, 1992;Janghorbani et al, 2015;Lobsiger and Kolar, 2015;Hayashi et al, 2017) and they are well suited to packaging of renewable energy sources. Indeed, due to their modular structure, they can be combined easily (Meynard, 2014).…”

Stability study and dynamical analysis of the multicellular chopper

“…Multicells converters have grown from an attractive theoretical concept to industrial applications, especially for use in higher power applications (Erickson and Maksimovic, 2001;Dargahi et al, 2014;Meynard and Foch, 1992;Janghorbani et al, 2015;Lobsiger and Kolar, 2015;Hayashi et al, 2017) and they are well suited to packaging of renewable energy sources. Indeed, due to their modular structure, they can be combined easily (Meynard, 2014).…”