Novel topological alternatives to the design of a harmonic-free, utility/DC interface

Circuit designs previously proposed for utility/DC power conditioning interfaces that draw a harmonic-free, unity power factor ac current have, for the most part, followed a certain topological approach. This paper discusses several alternative approaches that can greatly improve the interface´s simplicity, performance, and cost. One suggestion involves the use of a dc current source instead of a voltage source. Another concerns the use of a tuned passive filter to remove the ripple from the dc system´s waveforms. Results from an experimental 6 kW rectifier are included to demonstrate the feasibility and usefulness of the approaches suggested.