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P‐59: High‐Efficiency Direct‐Linked Zeta Converter for LED Backlight Units
Author(s) -
Oh Eunsuk,
Song Min Sup,
Kang Bongkoo,
Park Yong Kyu
Publication year - 2011
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.3621081
Subject(s) - inductor , boost converter , converters , buck converter , buck–boost converter , power (physics) , diode , ćuk converter , flyback converter , electrical engineering , backlight , topology (electrical circuits) , electronic engineering , computer science , voltage , materials science , engineering , physics , optoelectronics , quantum mechanics , liquid crystal display
This paper proposes a direct‐linked Zeta (DLZ) converter as a highly efficient step‐up and step‐down converter. It consists of the conventional Zeta converter components plus auxiliary diode and switch which form an additional power path which directly delivers input power to output load. The DLZ converter can directly deliver much of the input power to the output with little switching and conduction losses, and reduce circulating current in circuit components, thereby reducing switching losses and conduction losses of switches and diodes, winding resistive losses of inductors. The power delivery efficiency of the DLZ converter (96.1%) is 4.4% greater than that of the conventional Zeta converter (91.7%). This result demonstrates that the proposed DLZ converter can be used for highly efficient step‐up and step‐down converters.