DocumentCode :
2402188
Title :
Development of a DC-to-DC power converter
Author :
Lo, D.S. ; Henze, C.P.
Author_Institution :
Unisys Corp., St. Paul, MN, USA
fYear :
1989
fDate :
13-17 Mar 1989
Firstpage :
413
Lastpage :
422
Abstract :
A 2 in.×1 in.×0.18 in. planar transformer (consisting of two main transformers and four auxiliary transformers made of a low-profile magnetic structure and multilayer PWB windings) was fabricated and used in an interleaved flyback power converter. Power-train efficiencies greater than 80% were obtained at various input voltages, loads and temperatures using a 1 MHz, constant-frequency, pulse-width-modulated, zero-voltage resonant-transition switching technique. The highest efficiency observed was 85%. The results indicate that the planar transformer functions satisfactorily in an interleaved flyback power converter. However, power loss calculations result in 2 W unidentified losses when compared with the actual circuit performance. When discrete capacitors were replaced by a capacitor array substrate and the discrete MOSFET switches were replaced by MOSFET dies mounted on the capacitor substrate, the power conversion efficiency degraded 8%. This was attributed primarily to the extra lead resistance introduced by mounting the dies on the substrate. This loss could be reduced by improving the capacitor substrate metallization design
Keywords :
power convertors; transformers; 1 MHz; DC-to-DC power converter; MOSFET dies; capacitor array substrate; constant-frequency; interleaved flyback power converter; lead resistance; low-profile magnetic structure; metallization design; multilayer PWB windings; planar transformer; power loss calculations; power train efficiency; pulse-width-modulated; zero-voltage resonant-transition switching; Capacitors; Circuit optimization; DC-DC power converters; MOSFET circuits; Magnetic multilayers; Magnetic resonance; Power MOSFET; Pulse transformers; Temperature; Zero voltage switching;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Applied Power Electronics Conference and Exposition, 1989. APEC' 89. Conference Proceedings 1989., Fourth Annual IEEE
Conference_Location :
Baltimore, MD
Type :
conf
DOI :
10.1109/APEC.1989.36993
Filename :
36993
Link To Document :
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