Open AccessPlanar LTCC transformers for high voltage flyback converters.
Author(s) -
Alexander William Roesler,
Joshua M. Schare,
S. Jill Glass,
Kevin G. Ewsuk,
George Slama,
David Abel,
Daryl Schofield
Publication year - 2007
Language(s) - English
Resource type - Reports
DOI - 10.2172/945896
Subject(s) - flyback transformer , transformer , electrical engineering , voltage , converters , distribution transformer , flyback converter , delta wye transformer , electronic engineering , engineering , materials science
This paper discusses the design and use of low-temperature (850 C to 950 C) co-fired ceramic (LTCC) planar magnetic flyback transformers for applications that require conversion of a low voltage to high voltage (> 100V) with significant volumetric constraints. Measured performance and modeling results for multiple designs showed that the LTCC flyback transformer design and construction imposes serious limitations on the achievable coupling and significantly impacts the transformer performance and output voltage. This paper discusses the impact of various design factors that can provide improved performance by increasing transformer coupling and output voltage. The experiments performed on prototype units demonstrated LTCC transformer designs capable of greater than 2 kV output. Finally, the work investigated the effect of the LTCC microstructure on transformer insulation. Although this paper focuses on generating voltages in the kV range, the experimental characterization and discussion presented in this work applies to designs requiring lower voltage