A Non-isolated Single Phase Ups Topology With 110v/220v Input Output Voltage Ratings

Carlos G. C. Branco; Cícero M. T. Cruz; René P. Torrico-Bascopé; Fernando L. M. Antunes

doi:10.18618/REP.2006.2.111118

Authors

Carlos G. C. Branco Centro Federal de Educação Tecnológica do Piauí, Núcleo de Pesquisas em Engenharia Elétrica, Praça da Liberdade, No 1597 – Centro, CEP: 64.000-040, Teresina-PI-Brasil
Cícero M. T. Cruz Universidade Federal do Ceará, Departamento de Engenharia Elétrica, Campus do Pici, Bloco: 705, CEP: 60.455-760, Caixa Postal, 6001, Fortaleza-CE-Brasil
René P. Torrico-Bascopé Universidade Federal do Ceará, Departamento de Engenharia Elétrica, Campus do Pici, Bloco: 705, CEP: 60.455-760, Caixa Postal, 6001, Fortaleza-CE-Brasil
Fernando L. M. Antunes Universidade Federal do Ceará, Departamento de Engenharia Elétrica, Campus do Pici, Bloco: 705, CEP: 60.455-760, Caixa Postal, 6001, Fortaleza-CE-Brasil

DOI:

https://doi.org/10.18618/REP.2006.2.111118

Keywords:

Common Neutral Connection, On-Line UPS Systems, Power Factor Correction, soft-commutation, Transformerless UPS

Abstract

A circuit configuration of a single phase non-isolated on-line uninterruptible power supply (UPS) with 110V/220V input output voltage ratings is proposed, allowing the bypass operation without a transformer even if the input voltage is different of the output voltage. The converter consists of an AC-DC/DC-DC three level boost converter combined with a double half bridge inverter. In this type of configuration size, cost and efficiency are improved due to reduced number of switches and batteries, as well as no low frequency isolation transformer is required to realize bypass operation because of the common neutral connection. Both stages of the proposed circuit operate in high frequency, using a passive non-dissipative snubber circuit in the boost converter and IGBTs switches in the double half bridge inverter, with low conduction losses, low tail current and low switching losses. Principle of operation and experimental results for a 2.6kVA prototype are presented to demonstrate UPS performance.

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Author Biographies

Carlos G. C. Branco, Centro Federal de Educação Tecnológica do Piauí, Núcleo de Pesquisas em Engenharia Elétrica, Praça da Liberdade, No 1597 – Centro, CEP: 64.000-040, Teresina-PI-Brasil

was born in Fortaleza-CE, Brazil. He received the B.Sc. and M.Sc. degrees in Electrical Engineering from Federal University of Ceará, Brazil, in 2002 and 2005, respectively. Currently, he is Professor of the Federal Center of Technological Education of Piauí, Brazil. His research interests UPS systems, soft-switching techniques and converters for renewable energy sources. He is member of the Brazilian Society of Power Electronics (SOBRAEP) and the Institute of Electrical and Electronics Engineers (IEEE).

Cícero M. T. Cruz, Universidade Federal do Ceará, Departamento de Engenharia Elétrica, Campus do Pici, Bloco: 705, CEP: 60.455-760, Caixa Postal, 6001, Fortaleza-CE-Brasil

was born in Crato-CE, Brazil. He received the B.Sc. in Electrical Engineering from the Federal University of Ceará in 1990, and its M.Sc. and Dr.Eng. degrees in Electrical Engineering from Federal University of Santa Catarina, Brazil, in 1993 and 2002, respectively. Currently, he is Professor of the Department of Electrical Engineering of the Federal University of Ceará, Brazil. His research interests include Power Electronics and its application to renewable energy. He is member of the Brazilian Society of Power Electronics (SOBRAEP).

René P. Torrico-Bascopé, Universidade Federal do Ceará, Departamento de Engenharia Elétrica, Campus do Pici, Bloco: 705, CEP: 60.455-760, Caixa Postal, 6001, Fortaleza-CE-Brasil

was born in Cochabamba, Bolivia. He received the B.Eng. degree in Electrical Engineering from San Simón University of Cochabamba, Bolivia, in 1992, and its M.Eng. and Dr.Eng. degrees in Electrical Engineering from the Federal University of Santa Catarina, Florianópolis, Brazil, in 1994 and 2000, respectively. Currently, he is Professor of the Department of Electrical Engineering of the Federal University of Ceará, Brazil. His main research interests include power supplies, power factor correction techniques, UPS systems, and alternative energy systems.

Fernando L. M. Antunes, Universidade Federal do Ceará, Departamento de Engenharia Elétrica, Campus do Pici, Bloco: 705, CEP: 60.455-760, Caixa Postal, 6001, Fortaleza-CE-Brasil

was born in Cascavel-CE, Brazil. In 1978 he received the B.Sc. in Electrical Engineering from the Federal University of Ceará. In 1980 he received the M.Sc. degree from the University of São Paulo, Brazil, and in 1991 the PhD degree from Loughborough University of Technology, UK. He is a senior lecturer at Federal University of Ceará, Brazil, teaching Power Electronics and Electric Machines at graduate and undergraduate levels, and doing research in Power Electronics and its application to renewable energy. He is member of the Brazilian Society of Power Electronics (SOBRAEP) and the Institute of Electrical and Electronics Engineers (IEEE).

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