Double DC-DC converters with low input current ripple

Abstract

Abstruct -New topologies are presented in this paper, which merge the advantages of double dc-dc con%erters (large and/or large-range input-to-output voltage ratios) and low-ripple input current. Circuits are of the 6'h degree, but two inductors should be wounded on the same core, thus reducing size and cost and improving performances. Application : very-low-voltage. highcurrent DC supply. 0-7803-5692-6/00/s 10.00 (c) 2000 lEEE

DCM Frequency Control Algorithm for Multi-Phase DC-DC Boost Converters for Input Current Ripple Reduction

“…The voltage gain of the boost converter in the DCM operation is given by (5). D A represents the proportion of the inductor current that falls to 0 in the switching period and is given by (6).…”

“…Therefore, it is necessary to limit the input current ripple through proper equipment or a control method [4][5][6][7][8]. An additional hardware filter can be installed to limit the highfrequency input current ripple on the basis of the switching frequency.…”

“…Several topologies without a filter have been proposed to reduce the input current ripple [4][5][6][7][8]. Reference [5] proposes double-Cúk with a coupled inductor, and it achieves a near-zero input current ripple.…”

“…Reference [5] proposes double-Cúk with a coupled inductor, and it achieves a near-zero input current ripple. However, its double-stage configuration and the added passive components may decrease its efficiency and power density.…”