A reconfigurable three- and single-phase AC/DC non-isolated bi-directional converter for multiple worldwide voltages

AC/DC converters for worldwide deployment or multiple applications are often required to operate with single-or three-phase AC connections at a variety of voltages. Electric vehicle charging is an excellent example: a typical AC/DC converter optimized for a 400 V three-phase European connection will...

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Bibliographic Details
Published in2017 IEEE Energy Conversion Congress and Exposition (ECCE) pp. 1708 - 1714
Main Authors Opila, Daniel F., Eun Oh, Kintzley, Keith, Lomax, Jedediah
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.10.2017
Subjects
AC-DC power converters
Bidirectional control
Bridge circuits
Inverters
Legged locomotion
Plugs
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Summary:AC/DC converters for worldwide deployment or multiple applications are often required to operate with single-or three-phase AC connections at a variety of voltages. Electric vehicle charging is an excellent example: a typical AC/DC converter optimized for a 400 V three-phase European connection will only produce about 35% of rated power when operating on a 240 V single-phase connection in North America. This paper proposes a reconfigurable AC-DC converter with integral DC-DC stage that allows the single-phase AC power to roughly double compared to a standard configuration, up to 2/3 of the DC/DC stage rating. The system is constructed with two conventional back-to-back three-phase two-level bridges. When operating in single-phase mode, rather than leaving the DC side under-utilized, our proposed design repurposes one of the DC phase legs and the unused AC phase to create two parallel single-phase connections. This roughly doubles the AC output current and hence doubles the single phase AC power.
DOI:10.1109/ECCE.2017.8095999