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Implementation of an Efficient Transformerless Single-Stage Single-Switch AC/DC Converter

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2 Author(s)
Shu-Kong Ki ; Sch. of Electr. & Inf. Eng., Univ. of Sydney, Sydney, NSW, Australia ; Lu, D.D.-C.

A transformerless single-stage single-switch ac/dc converter is presented in this paper. The converter allows a portion of the input power to be processed once only, resulting in enhanced conversion efficiency. Additionally, due to the absence of a transformer, the size and manufacturing cost of the converter can be reduced. The intermediate bus voltage is well kept below 400 V while maintaining high power factor even at light load and high line-input conditions. Extended experimental results on a 100-W hardware prototype for universal input-voltage range (90-270 Vrms) are given to confirm the theoretical analysis and performance of the proposed converter.

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:57 ,  Issue: 12 )