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Energies 2016, 9(2), 96; doi:10.3390/en9020096

Elimination of the Inrush Current Phenomenon Associated with Single-Phase Offline UPS Systems

Deptartment of Electronic Systems Engineering, Hanyang University ERICA, Ansan 426-791, Korea
Author to whom correspondence should be addressed.
Academic Editor: Gabriele Grandi
Received: 4 December 2015 / Revised: 27 January 2016 / Accepted: 28 January 2016 / Published: 4 February 2016


Critical load applications always rely on UPS systems to uphold continuous power during abnormal grid conditions. In case of any power disruption, an offline UPS system starts powering the load to avoid blackout. However, this process can root the momentous inrush current for the transformer installed before the load. The consequences of inrush current can be the reduction of output voltage and tripping of protective devices of the UPS system. Furthermore, it can also damage the sensitive load and decrease the transformer’s lifetime. To prevent the inrush current, and to avoid its disruptive effects, this research suggests an offline UPS system based on a current regulated inverter that eliminates the inrush current while powering the transformer coupled loads. A detailed comparative analysis of the conventional and proposed topologies is presented and the experiment was performed by using a small prototype to validate the performance, and operation of the proposed topology. View Full-Text
Keywords: uninterruptible power supply; offline; inrush currents; current regulation uninterruptible power supply; offline; inrush currents; current regulation

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Bukhari, S.S.H.; Atiq, S.; Kwon, B.-I. Elimination of the Inrush Current Phenomenon Associated with Single-Phase Offline UPS Systems. Energies 2016, 9, 96.

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