Integrated Transformer with Buried Windings in Ferrite Core

Mahamat Ahmat Taha; Mahamat Hassan Bechir; Ouzer Nabil Adam; Arafat Ousman Bechir; Boukhari Mahamat Issa; Yaya Dagal Dari; David Pietroy; Jean Jacques Rousseau

doi:doi:10.11648/j.jeee.20221001.12

Integrated Transformer with Buried Windings in Ferrite Core

Mahamat Ahmat Taha, Mahamat Hassan Bechir, Ouzer Nabil Adam, Arafat Ousman Bechir, Boukhari Mahamat Issa, Yaya Dagal Dari, David Pietroy, Jean Jacques Rousseau

Published in Journal of Electrical and Electronic Engineering (Volume 10, Issue 1)

Received: 15 January 2022 Accepted: 27 January 2022 Published: 9 February 2022

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Abstract

In the field of electronics, one of the objectives of current research is to integrate numerous components in increasingly smaller volumes. Reducing the cost of manufacturing components requires integration and collective manufacturing. This paper mainly focuses on the design and the main steps of the micro-fabrication of a transformer with magnetic layers. Windings have been buried in a ferrite core by using Femtosecond Laser Micromachining. Such a burying of windings avoids air gap and greatly increases primary and secondary inductances. Different technological steps from copper deposition to the realization of the grooves in the magnetic material (in the case of the buried transformer) through etching, gilding, lapping, sawing, polishing and gluing have been described. We also used a negative photoresist (SU-8) as an insulating layer and as a support for the fabrication of an air bridge to connect the center pad of the coils to the ground plane. The micro-transformer was characterized with a Vector Network Analyzer and the bandwidth was observed from 20 kHz to 7 MHz. The gain in the bandwidth is equal to 0,86. The buried conductors allow to increase the magnetizing inductance of the transformer and the shift of 45° between the primary and secondary windings allows to decrease the capacitive coupling.

Published in	Journal of Electrical and Electronic Engineering (Volume 10, Issue 1)
DOI	10.11648/j.jeee.20221001.12
Page(s)	10-17
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2022. Published by Science Publishing Group

Keywords

Integrated Micro-transformer, Femtosecond Laser Micromachining, Buried Windings, Ferrite

References

[1]	D.-H. Weon and Saeed Mohammadi. (2007). High-Inductance-Density, AirCore, Power Inductors, and Transformers Designed for Operation at 100–500 MHz. IEEE High Performance 3-D Helical RF Transformers, pp. 1897-1900. Doi: 10.1109/TMAG.2010.2045742.
[2]	Chinchun Meng, Ya-Hui Teng, Yi-Chen Lin, Jhin-Ci Jhong and YingChieh Yen. (2007). Characterisatics of Integrated RF Transfomers on GaAs Substrats. IEEE Proceeding of Asia-Pacific Microwave Conference, pp. 1.4. Doi: 10.1109/APMC.2007.4554720.
[3]	Jumril Yunas, Burhanuddin Yeop Majlis. (2008). Comparative study of stack interwinding micro-transformers on silicon monolithic. Microelectronics Journal, vol. 39, issue. 12, pp. 1564-1567. Doi: 10.1016/j.mejo.2008.02.026.
[4]	Christopher D. Meyer, Sarah S. Bedair, Brian C. Morgan, and David P. Arnold. (2010). High-Inductance-Density, Air-Core, Power Inductors, and Transformers Designed for Operation at 100–500 MHz. IEEE Transactions On Magnetics, vol. 46, pp. 2236-2239, Juin 2010. DOI: 10.1109/TMAG.2010.2045742.
[5]	Shlomo Katz, IgorBrouk, SaraStolyarov, ShyeShapira, YaelNemirovsky. (2012). High performance MEMS 0.18 µm RF-CMOS transformers. Microelectronics Journal, vol. 43, pp. 13-16. DOI: 10.1109/COMCAS.2009.5386016.
[6]	Masato Mino, Toshiaki Yachi, Akio Tago, Keiichi Yanagisawa, and Kazuhiko Sakakibara. (1992). A New Planar Micro-transformer for Use in Micro- Switching Converters. IEEE Transactions On Magnetics, vol. 28, pp. 17691973, Juillet-Août 1992. DOI: 10.1109/20.144755.
[7]	Hideyuki Ito, Asako Takeuchi, Shinya Okazaki, Hiroki Kobayashi, Yuichiro Sugawa, Akihiro Takeshima, Makoto Sonehara, Nobuhiro Matsushita and Toshiro Sato. (2011). Fabrication of Planar Power Inductor for Embedded Passives in LSI Package for Hundreds Megahertz Switching DC–DC Buck Converter. IEEE Transactions On Magnetics, vol. 47, pp. 32043207. DOI: 10.1109/TMAG.2011.2147288.
[8]	Ningning Wang, Santosh Kulkarni, Brice Jamieson, James Rohan, Declan Casey, Saibal Roy, Cian O’Mathuna. (2012) High Efficiency Si Integrated MicroTransformers Using Stacked Copper Windings for Power Conversion Applications. IEEE Enterprise Ireland UTIM, pp. 411-416. Doi: 10.1109/APEC.2012.6165852.
[9]	Satoru Itoh, Yutaka Yamamoto, Akihiro Makino, Takashi Yamaguchi, Ichiro Sasada. (1998). A low Profile Type High Frequency Transformer Using a fine Grained Mn-Zn Ferrite. IEEE Power Electronics Specialists Conference, pp. 1492-1498. DOI: 10.1109/PESC.1998.703261.
[10]	J. Y. Park, L. K. Lagorce, M. G. Allen. (1997). Ferrite Based Integrated Planar Inductors and Transformers Fabricated at Low Temperature. IEEE Transactions On Magnetics, vol. 33, N°5, September 97. DOI: 10.1109/20.617931.
[11]	Dong H. Bang and Jae Y. Park. (2009). Ni-Zn Ferrite Screen Printed Power Inductors for Compact DC-DC Power Converter Applications. IEEE Transactions On Magnetics. vol. 45, pp. 2762-2765. Doi: 10.1109/TMAG.2009.2020550.
[12]	K. I. Arshak, A. Ajina, D. Egan. (2001). Development of screen-printed polymer thick film planner transformer using Mn–Zn ferrite as core material. Microelectronics Journal, vol. 32, pp. 113-116. DOI: 10.1016/S0026-2692(00)00122-1.
[13]	A. Mercier, K. Zehani, G. Chaplier, A. Pasko, V. Loyau and F. Mazaleyrat. (2015) SPS co-sintered monolithic transformers for power electronic. IEEE Transaction on Magnetics, vol. 4, pp. 1-4. Doi: 10.1109/TMAG.2015.2504876.
[14]	Faouzi KAHLOUCHE, Youssouf KHAMIS, Mahamat hasan BECHIR, Stephane CAPRARO, Ali SIBLINI, Jean Pierre CHATELON, Cyril BUTTAY, Jean Jacques ROUSSEAU. (2014). Fabrication and characterization of a planar interleaved micro-transformer with magnetic core. Microelectronics Journal, vol. 45, pp. 893-897. https://doi.org/10.1016/j.mejo.2014.03.003
[15]	Alireza Zolfaghari, Andrew Chan, and Behzad Razavi. (2000). Stacked Inductors and 1 to 2 Transformers in CMOS Technology. IEEE Custom Integrated Circuits Conference, pp. 620-628. Doi: 10.1109/CICC.2000.852681.
[16]	Lei Gu and Xinxin Li. (2007). High-Performance CMOS-Compatible Solenoidal Transformers With a Concave-Suspended Configuration. IEEE Transaction on microwave theory and Techniques, vol. 55, pp. 1237-1245. Doi: 10.1109/TMTT.2007.897853.
[17]	Fu Jian, Mei Niansong, Huang Yumei, and Hong Zhiliang. (2011). CMOS high linearity PA driver with an on-chip transformer for W-CDMA application. Journal of Semicondocs, vol. 32, pp. 1-6. DOI: 10.1088/1674-4926/32/9/095006.
[18]	T. Mahamat, B. Danoumbé, M. Youssouf, J. P. Chatelon, S. Capraro, and J.J. Rousseau, (2016). Optimization of integrated magnetic planar transformer. IEEE Proc. Eur. Conf. Power Electron. Appl. (EPE), p 1-8, Sep. 2016. DOI: 10.1109/EPE.2016.7695386.
[19]	A. Abderahim, O.B. Arafat, A. Ouzer Nabil, Y. Dagal Dari. (2021). Windings losses of planar components determination from current density. International Journal of Engineering Sciences & Research Technology. Vol. 10, No. 11, November 2021, pp. 46 – 53. http://www.ijesrt.com/November-2021.html
[20]	Sunderarajan S. Mohan, Maria del Mar Hershenson, Stephen P. Boyd, and Thomas H. Lee. (1999). Simple Accurate Expressions for Planar Spiral Inductances. IEEE Journal of Solid-State Circuits, Vol. 34, NO. 10, october 1999, pp 1419-1424. DOI: 10.1109/4.792620.
[21]	D. A. Oumar, M. I. Boukhari, M. A. Taha, S. Capraro, D. Piétroy, J. P. Chatelon, J. J. Rousseau. (2019). Characterization Method for Integrated Magnetic Devices at Lower Frequencies (up to 110 MHz). Journal of Electronic Testing: Theory and Applications (JETTA). https://doi.org/10.1007/s10836-019-05790-3. pp. 245 – 251.

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APA Style

Mahamat Ahmat Taha, Mahamat Hassan Bechir, Ouzer Nabil Adam, Arafat Ousman Bechir, Boukhari Mahamat Issa, et al. (2022). Integrated Transformer with Buried Windings in Ferrite Core. Journal of Electrical and Electronic Engineering, 10(1), 10-17. https://doi.org/10.11648/j.jeee.20221001.12

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ACS Style

Mahamat Ahmat Taha; Mahamat Hassan Bechir; Ouzer Nabil Adam; Arafat Ousman Bechir; Boukhari Mahamat Issa, et al. Integrated Transformer with Buried Windings in Ferrite Core. J. Electr. Electron. Eng. 2022, 10(1), 10-17. doi: 10.11648/j.jeee.20221001.12

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AMA Style

Mahamat Ahmat Taha, Mahamat Hassan Bechir, Ouzer Nabil Adam, Arafat Ousman Bechir, Boukhari Mahamat Issa, et al. Integrated Transformer with Buried Windings in Ferrite Core. J Electr Electron Eng. 2022;10(1):10-17. doi: 10.11648/j.jeee.20221001.12

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@article{10.11648/j.jeee.20221001.12,
  author = {Mahamat Ahmat Taha and Mahamat Hassan Bechir and Ouzer Nabil Adam and Arafat Ousman Bechir and Boukhari Mahamat Issa and Yaya Dagal Dari and David Pietroy and Jean Jacques Rousseau},
  title = {Integrated Transformer with Buried Windings in Ferrite Core},
  journal = {Journal of Electrical and Electronic Engineering},
  volume = {10},
  number = {1},
  pages = {10-17},
  doi = {10.11648/j.jeee.20221001.12},
  url = {https://doi.org/10.11648/j.jeee.20221001.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.jeee.20221001.12},
  abstract = {In the field of electronics, one of the objectives of current research is to integrate numerous components in increasingly smaller volumes. Reducing the cost of manufacturing components requires integration and collective manufacturing. This paper mainly focuses on the design and the main steps of the micro-fabrication of a transformer with magnetic layers. Windings have been buried in a ferrite core by using Femtosecond Laser Micromachining. Such a burying of windings avoids air gap and greatly increases primary and secondary inductances. Different technological steps from copper deposition to the realization of the grooves in the magnetic material (in the case of the buried transformer) through etching, gilding, lapping, sawing, polishing and gluing have been described. We also used a negative photoresist (SU-8) as an insulating layer and as a support for the fabrication of an air bridge to connect the center pad of the coils to the ground plane. The micro-transformer was characterized with a Vector Network Analyzer and the bandwidth was observed from 20 kHz to 7 MHz. The gain in the bandwidth is equal to 0,86. The buried conductors allow to increase the magnetizing inductance of the transformer and the shift of 45° between the primary and secondary windings allows to decrease the capacitive coupling.},
 year = {2022}
}

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TY  - JOUR
T1  - Integrated Transformer with Buried Windings in Ferrite Core
AU  - Mahamat Ahmat Taha
AU  - Mahamat Hassan Bechir
AU  - Ouzer Nabil Adam
AU  - Arafat Ousman Bechir
AU  - Boukhari Mahamat Issa
AU  - Yaya Dagal Dari
AU  - David Pietroy
AU  - Jean Jacques Rousseau
Y1  - 2022/02/09
PY  - 2022
N1  - https://doi.org/10.11648/j.jeee.20221001.12
DO  - 10.11648/j.jeee.20221001.12
T2  - Journal of Electrical and Electronic Engineering
JF  - Journal of Electrical and Electronic Engineering
JO  - Journal of Electrical and Electronic Engineering
SP  - 10
EP  - 17
PB  - Science Publishing Group
SN  - 2329-1605
UR  - https://doi.org/10.11648/j.jeee.20221001.12
AB  - In the field of electronics, one of the objectives of current research is to integrate numerous components in increasingly smaller volumes. Reducing the cost of manufacturing components requires integration and collective manufacturing. This paper mainly focuses on the design and the main steps of the micro-fabrication of a transformer with magnetic layers. Windings have been buried in a ferrite core by using Femtosecond Laser Micromachining. Such a burying of windings avoids air gap and greatly increases primary and secondary inductances. Different technological steps from copper deposition to the realization of the grooves in the magnetic material (in the case of the buried transformer) through etching, gilding, lapping, sawing, polishing and gluing have been described. We also used a negative photoresist (SU-8) as an insulating layer and as a support for the fabrication of an air bridge to connect the center pad of the coils to the ground plane. The micro-transformer was characterized with a Vector Network Analyzer and the bandwidth was observed from 20 kHz to 7 MHz. The gain in the bandwidth is equal to 0,86. The buried conductors allow to increase the magnetizing inductance of the transformer and the shift of 45° between the primary and secondary windings allows to decrease the capacitive coupling.
VL  - 10
IS  - 1
ER  -

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Author Information

Mahamat Ahmat Taha

Hubert Curien Laboratory, Jean Monnet University of Saint Etienne, Saint Etienne, France
Mahamat Hassan Bechir

Hubert Curien Laboratory, Jean Monnet University of Saint Etienne, Saint Etienne, France
Ouzer Nabil Adam

Hubert Curien Laboratory, Jean Monnet University of Saint Etienne, Saint Etienne, France
Arafat Ousman Bechir

Hubert Curien Laboratory, Jean Monnet University of Saint Etienne, Saint Etienne, France
Boukhari Mahamat Issa

Hubert Curien Laboratory, Jean Monnet University of Saint Etienne, Saint Etienne, France
Yaya Dagal Dari

Hubert Curien Laboratory, Jean Monnet University of Saint Etienne, Saint Etienne, France
David Pietroy

Hubert Curien Laboratory, Jean Monnet University of Saint Etienne, Saint Etienne, France
Jean Jacques Rousseau

Hubert Curien Laboratory, Jean Monnet University of Saint Etienne, Saint Etienne, France

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APA Style

Mahamat Ahmat Taha, Mahamat Hassan Bechir, Ouzer Nabil Adam, Arafat Ousman Bechir, Boukhari Mahamat Issa, et al. (2022). Integrated Transformer with Buried Windings in Ferrite Core. Journal of Electrical and Electronic Engineering, 10(1), 10-17. https://doi.org/10.11648/j.jeee.20221001.12

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ACS Style

Mahamat Ahmat Taha; Mahamat Hassan Bechir; Ouzer Nabil Adam; Arafat Ousman Bechir; Boukhari Mahamat Issa, et al. Integrated Transformer with Buried Windings in Ferrite Core. J. Electr. Electron. Eng. 2022, 10(1), 10-17. doi: 10.11648/j.jeee.20221001.12

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AMA Style

Mahamat Ahmat Taha, Mahamat Hassan Bechir, Ouzer Nabil Adam, Arafat Ousman Bechir, Boukhari Mahamat Issa, et al. Integrated Transformer with Buried Windings in Ferrite Core. J Electr Electron Eng. 2022;10(1):10-17. doi: 10.11648/j.jeee.20221001.12

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@article{10.11648/j.jeee.20221001.12,
  author = {Mahamat Ahmat Taha and Mahamat Hassan Bechir and Ouzer Nabil Adam and Arafat Ousman Bechir and Boukhari Mahamat Issa and Yaya Dagal Dari and David Pietroy and Jean Jacques Rousseau},
  title = {Integrated Transformer with Buried Windings in Ferrite Core},
  journal = {Journal of Electrical and Electronic Engineering},
  volume = {10},
  number = {1},
  pages = {10-17},
  doi = {10.11648/j.jeee.20221001.12},
  url = {https://doi.org/10.11648/j.jeee.20221001.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.jeee.20221001.12},
  abstract = {In the field of electronics, one of the objectives of current research is to integrate numerous components in increasingly smaller volumes. Reducing the cost of manufacturing components requires integration and collective manufacturing. This paper mainly focuses on the design and the main steps of the micro-fabrication of a transformer with magnetic layers. Windings have been buried in a ferrite core by using Femtosecond Laser Micromachining. Such a burying of windings avoids air gap and greatly increases primary and secondary inductances. Different technological steps from copper deposition to the realization of the grooves in the magnetic material (in the case of the buried transformer) through etching, gilding, lapping, sawing, polishing and gluing have been described. We also used a negative photoresist (SU-8) as an insulating layer and as a support for the fabrication of an air bridge to connect the center pad of the coils to the ground plane. The micro-transformer was characterized with a Vector Network Analyzer and the bandwidth was observed from 20 kHz to 7 MHz. The gain in the bandwidth is equal to 0,86. The buried conductors allow to increase the magnetizing inductance of the transformer and the shift of 45° between the primary and secondary windings allows to decrease the capacitive coupling.},
 year = {2022}
}

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TY  - JOUR
T1  - Integrated Transformer with Buried Windings in Ferrite Core
AU  - Mahamat Ahmat Taha
AU  - Mahamat Hassan Bechir
AU  - Ouzer Nabil Adam
AU  - Arafat Ousman Bechir
AU  - Boukhari Mahamat Issa
AU  - Yaya Dagal Dari
AU  - David Pietroy
AU  - Jean Jacques Rousseau
Y1  - 2022/02/09
PY  - 2022
N1  - https://doi.org/10.11648/j.jeee.20221001.12
DO  - 10.11648/j.jeee.20221001.12
T2  - Journal of Electrical and Electronic Engineering
JF  - Journal of Electrical and Electronic Engineering
JO  - Journal of Electrical and Electronic Engineering
SP  - 10
EP  - 17
PB  - Science Publishing Group
SN  - 2329-1605
UR  - https://doi.org/10.11648/j.jeee.20221001.12
AB  - In the field of electronics, one of the objectives of current research is to integrate numerous components in increasingly smaller volumes. Reducing the cost of manufacturing components requires integration and collective manufacturing. This paper mainly focuses on the design and the main steps of the micro-fabrication of a transformer with magnetic layers. Windings have been buried in a ferrite core by using Femtosecond Laser Micromachining. Such a burying of windings avoids air gap and greatly increases primary and secondary inductances. Different technological steps from copper deposition to the realization of the grooves in the magnetic material (in the case of the buried transformer) through etching, gilding, lapping, sawing, polishing and gluing have been described. We also used a negative photoresist (SU-8) as an insulating layer and as a support for the fabrication of an air bridge to connect the center pad of the coils to the ground plane. The micro-transformer was characterized with a Vector Network Analyzer and the bandwidth was observed from 20 kHz to 7 MHz. The gain in the bandwidth is equal to 0,86. The buried conductors allow to increase the magnetizing inductance of the transformer and the shift of 45° between the primary and secondary windings allows to decrease the capacitive coupling.
VL  - 10
IS  - 1
ER  -

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