High-Bandwidth Low-Insertion Loss Solenoid Transformers Using FeCoB Multilayers

High-bandwidth low-insertion loss solenoid transformers using a multilayered FeCoB magnetic core have been designed, modeled, fabricated, and characterized for high-frequency power conversion. Various transformer designs are compared in terms of inductance, resistance, quality factor, mutual coupling, and insertion loss. A mutual coupling coefficient of 0.9 up to 50 MHz is achieved for intertwined solenoid transformers with a patterned magnetic core.

[1]  Rongxiang Wu,et al.  High-Efficiency Silicon-Embedded Coreless Coupled Inductors for Power Supply on Chip Applications , 2012, IEEE Transactions on Power Electronics.

[2]  Marian K. Kazimierczuk,et al.  High-frequency small-signal model of ferrite core inductors , 1999 .

[3]  Jizheng Qiu,et al.  Design and Fabrication of VHF Tapped Power Inductors Using Nanogranular Magnetic Films , 2012, IEEE Transactions on Power Electronics.

[4]  Terence O'Donnell,et al.  Electrical performance of microtransformers for DC-DC converter applications , 2002 .

[5]  N. Wang,et al.  Thin film micro-transformers for future power conversion , 2004, Nineteenth Annual IEEE Applied Power Electronics Conference and Exposition, 2004. APEC '04..

[6]  Hidetoshi Matsuki,et al.  Load characteristics of a spiral coil type thin film microtransformer , 1993 .

[7]  Baoxing Chen,et al.  Fully integrated isolated dc-dc converter using micro-transformers , 2008, 2008 Twenty-Third Annual IEEE Applied Power Electronics Conference and Exposition.

[8]  Andrei Papou,et al.  Analysis of Integrated Solenoid Inductor With Closed Magnetic Core , 2010, IEEE Transactions on Magnetics.

[9]  Chi Kwan Lee,et al.  On the relationship of quality factor and hollow winding structure of coreless printed spiral winding (CPSW) inductor , 2012, IEEE Transactions on Power Electronics.

[10]  S. Campbell,et al.  Fabrication and characterization of a solenoid-type microtransformer , 2003 .

[11]  J. Burghartz,et al.  Substrate effects in monolithic RF transformers on silicon , 2002 .

[12]  Charles R. Sullivan,et al.  Design of microfabricated transformers and inductors for high-frequency power conversion , 1996 .

[13]  M. Kazimierczuk,et al.  Modelling iron-powder inductors at high frequencies , 1994, Proceedings of 1994 IEEE Industry Applications Society Annual Meeting.

[14]  C. Ahn,et al.  A microfabricated transformer for high-frequency power and signal conversion , 1998 .

[15]  Xing Xing,et al.  Soft magnetic materials and devices on energy applications , 2011 .

[16]  D. Harame,et al.  Lateral microwave transformers and inductors implemented in a Si/SiGe HBT process , 1999, 1999 IEEE MTT-S International Microwave Symposium Digest (Cat. No.99CH36282).

[17]  Masahiro Yamaguchi,et al.  Improved RF integrated magnetic thin-film inductors by means of micro slits and serface planalization techniques , 2000 .

[18]  Ming Liu,et al.  RF Magnetic Properties of FeCoB/Al $_{2}$ O $_{3}$ /FeCoB Structure With Varied Al $_{2}$ O $_{3}$ Thickness , 2011 .

[19]  Baoxing Chen,et al.  Isolated half-bridge gate driver with integrated high-side supply , 2008, 2008 IEEE Power Electronics Specialists Conference.

[20]  Hyungcheol Shin,et al.  A simple wide-band on-chip inductor model for silicon-based RF ICs , 2003 .

[21]  M. Mino,et al.  Planar microtransformer with monolithically-integrated rectifier diodes for micro-switching converters , 1996 .

[22]  P. L. Dowell,et al.  Effects of eddy currents in transformer windings , 1966 .

[23]  M. Kazimierczuk,et al.  Model of laminated iron-core inductors for high frequencies , 2004, IEEE Transactions on Magnetics.

[24]  Dok Won Lee,et al.  Fabrication and Analysis of High-Performance Integrated Solenoid Inductor With Magnetic Core , 2008, IEEE Transactions on Magnetics.

[25]  Mark G. Allen,et al.  A fully integrated planar toroidal inductor with a micromachined nickel-iron magnetic bar , 1994 .

[26]  Marian K. Kazimierczuk,et al.  High-frequency models of ferrite core inductors , 1994, Proceedings of IECON'94 - 20th Annual Conference of IEEE Industrial Electronics.

[27]  M. Steigerwald,et al.  Micro-transformer devices using thin-film electroplated deposition , 1998, PESC 98 Record. 29th Annual IEEE Power Electronics Specialists Conference (Cat. No.98CH36196).

[28]  Mark G. Allen,et al.  Development of magnetic materials and processing techniques applicable to integrated micromagnetic devices , 1998 .