Non-isolated Single Phase Uninterruptible Power Supply (UPS) System Muhammad Aamir and Hee-Jun Kim Dept. of Electronics, Electrical, Control, and Instrumentation Engineering, Hanyang University, Korea

Non-isolated Single Phase Uninterruptible Power Supply (UPS) System Muhammad Aamir and Hee-Jun Kim Dept. of Electronics, Electrical, Control, and Instrumentation Engineering, Hanyang University, Korea
Abstract-- In this paper, a high performance single phase
transformer-less online uninterruptable power supply (UPS)
is proposed. The use of the bidirectional buck-boost
converter with high conversion ratio not only reduces the
number of batteries but also ensures a transformer-less
system. The rectifier has capability of power factor
correction and provides regulated DC link voltage whereas
the inverter provides a regulated sinusoidal output voltage
to the load. In order to control the transient effect, efficient
control scheme is adopted in the system. The overall
efficiency of the system is improved with significant
reduction in size and weight of the system due to decrease
number of batteries. Qualitative analysis and experimental
results obtained with a 500VA prototype shows a normal
efficiency of over 94% and an input power factor of over 99%.
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