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Article
Author(s)
Yusuke Hayashi, Yoshikatsu Matsugaki and Tamotsu Ninomiya
Full-Text PDF XML 758 Views
DOI:10.17265/1934-8975/2017.09.006
Affiliation(s)
Green Electronics Research Institute, Kitakyusyu, Fukuoka 808-0135, Japan
ABSTRACT
A novel high step-down non-isolated
DC-DC converter has been proposed. The proposed converter consists of highly
efficient non-isolated cell converters using bidirectional semiconductor power devices, and these cell
converters are connected in ISOP (input series and output parallel). The non-isolated ISOP converter achieves high step-down ratio of D/N,
operating N cell converters under the duty ratio of D. Availability of the proposed converter has been shown by
developing the 48 V-12 V laboratory prototype using two 24 V-12 V cell converters. Design consideration for the
48 V-3 V multicellular converter using four 12 V-3 V cell converters has been also conducted, and
the potential to approach the efficiency of 97% has been discussed. The
proposed topology is suitable for the POL (point of load) converters in the highly
efficient next generation DC distribution system for data centers.
KEYWORDS
DC-DC converter, high step-down ratio, ISOP, GaN (gallium nitride).
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