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Title: Low output ripple DC-DC converter based on an overlapping dual asymmetric half-bridge topology
Authors: Liu, JCP
Poon, NK
Pong, BMH
Tse, CKM 
Issue Date: Sep-2007
Source: IEEE transactions on power electronics, Sept. 2007, v. 22, no. 5, p. 1956-1963
Abstract: A new converter topology is described for applications requiring very low output current ripple. The proposed converter consists of two asymmetric half-bridge converters whose output voltages overlap in a finite interval of time. This converter provides well regulated and smooth dc output without the need of an output filter. The output voltage is regulated by direct amplitude modulation. Unlike the standard interleaved converters, the proposed converter is robust to input voltage and operating duty cycle variations. Furthermore, equal current sharing is automatically achieved under all conditions, thus ensuring full utilisation of the output rectifiers for wide input and output ranges. The circuit achieves zero-voltage turnon for all primary switches and zero-current turnoff for the output rectifiers. An isolated dc-dc converter prototype with 5-V output voltage and 20-A output current has been built to verify the design.
Keywords: DC-DC converter
Half-bridge converter
Low output ripple
Zero-current turnoff
Zero-voltage turnon
Publisher: Institute of Electrical and Electronics Engineers
Journal: IEEE transactions on power electronics 
ISSN: 0885-8993
EISSN: 1941-0107
DOI: 10.1109/TPEL.2007.904214
Rights: © 2007 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
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