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Input current shaper based on the series connection of a voltage source and a loss-free resistor

A new input current shaper is proposed in this paper. The operating principle is based on the connection of a voltage source and a loss-free resistor (LFR) between the input rectifier and the bulk capacitor in a conventional switching-mode power supply with no power factor correction. Both the voltage source and the LFR are obtained as an additional output from the power converter's transformer. This additional output is a forward-type scheme with one extra inductor. With the final topology, a good tradeoff between capacitor voltage, re-cycling energy and harmonic content can be established in order to comply with IEC 1000-3-2 at different power levels.