a novel approach for low-emi and upf uninterruptible power supply
R.Dhanasekaran,M.Murugan
Published in International Journal of Advanced Research in Electrical and Electronics Engineering
ISSN: 2321-4775 Impact Factor:1.6 Volume:1 Issue:1 Year: 08 June,2013 Pages:17-32
Abstract
A novel line interactive UPS configuration is investigated that offers the characteristics of an on-line or inverter preferred UPS that features low-EMI and draws Unity Power Factor (UPF) without the addition of a pre-regulator at a reduced cost. This new UPS is based on combination of two full bridge VSI converters, one series with the input, and other parallel to the load. The UPS acts as a line conditional and output voltage stabilizer. The series converter sees only a small percentage of the input voltage. Therefore small kVA rating, which results reduced system cost compared conventional on-line system cost compared conventional on-line system and a new high frequency dc- dc converter is proposed, which is based on a half bridge series resonant converter. The converter features Zero Voltage turn on, snubbed turn off at reduced current for the switching device and operating at switching frequency higher than 20kHz. The efficiency of the converter is very high under full load and low load conditions, so total component converter structure exhibits high efficiency.
Kewords
UPS, ZCS, ZVS, EMI .
Reference
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