Ripple-reduction tuned filtering switching power converter topology

This paper presents a low-ripple topology for switching power converters that approximates the ideal ripple-free averaged dynamics by means of reactive passive tuned filters. The low-ripple characteristics can be taken advantage of to either improve the suitability of the switching power converter to supply ripple-sensitive loads, or to reduce the value of the converter main filtering capacitor. The work explores this second property in the context of pursuing further miniaturization and particularly on-chip circuit integration of a switching power converter. Experimental results for a low frequency prototype demonstrate the functionality of the proposed low-ripple topology, showing in particular a reduction of a factor of seven for the main capacitor in the converter.