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Novel single-phase AC-to-DC convertor using three-phase modified series-parallel resonant convertor

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3 Author(s)
Tanavade, S.S. ; Dept. of Electr. Eng., Visvesvaraya Nat. Inst. of Technol., Nagpur, India ; Suryawanshi, H.M. ; Thakre, K.L.

The paper deals with a single-phase AC-to-DC convertor using a three-phase modified series-parallel resonant convertor. A systematic procedure is presented for the design of three-phase resonant-convertor components. Based on the analysis and design curves, a resonant convertor is designed for 2.5 kW rating. The minimum switching frequency of the convertor is 290 kHz at full-load condition. The simulation and experimental results are presented for variable-load conditions. The variable frequency and duty-ratio control scheme are implemented using a digital signal processor for output-voltage regulation. The use of a three-phase high-frequency invertor reduces the filtering requirements, peak component stresses on the resonant components and peak invertor output current. The proposed convertor maintains excellent input-line power factor without any active control of AC-input line current. Apart from this, it requires narrow variation in switching frequency for its output-voltage regulation.

Published in:

Electric Power Applications, IEE Proceedings -  (Volume:152 ,  Issue: 4 )