Ultra-large gain step-up switched-capacitor DC-DC converter with coupled inductor for alternative sources of energy

Tsorng Juu Liang, Shih Ming Chen, Lung Sheng Yang, Jiann Fuh Chen, Adrian Ioinovici

Research output: Contribution to journalArticlepeer-review

154 Citations (Scopus)

Abstract

An ultra-large voltage conversion ratio converter is proposed by integrating a switched-capacitor circuit with a coupled inductor technology. The proposed converter can be seen as an equivalent parallel connection to the load of a basic boost converter and a number of forward converters, each one containing a switched-capacitor circuit. All the stages are activated by the boost switch. A single active switch is required, with no need of extreme duty-ratio values. The leakage energy of the coupled inductor is recycled to the load. The inrush current problem of switched capacitors is restrained by the leakage inductance of the coupled-inductor. The above features are the reason for the high efficiency performance. The operating principles and steady state analyses of continuous, discontinuous and boundary conduction modes are discussed in detail. To verify the performance of the proposed converter, a 200 W/20 V to 400 V prototype was implemented. The maximum measured efficiency is 96.4%. The full load efficiency is 95.1%.

Original languageEnglish
Article number6174511
Pages (from-to)864-874
Number of pages11
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
Volume59
Issue number4
DOIs
Publication statusPublished - 2012

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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