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Sensors 2010, 10(9), 8161-8172; doi:10.3390/s100908161

Applications of Ferro-Nanofluid on a Micro-Transformer

1,* , 2
1 Department of Mechanical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan 2 Department of Energy and Refrigerating Air-conditioning Engineering, National Taipei University of Technology, No.1, Sec. 3, Chung-hsiao E. Rd., Taipei 10608, Taiwan 3 Department of Mechanical and Computer-Aided Engineering, St. John’s University, No. 499, Sec. 4, Tam-king Rd., Tamsui, Taipei 25135, Taiwan
* Author to whom correspondence should be addressed.
Received: 8 June 2010 / Revised: 20 August 2010 / Accepted: 20 August 2010 / Published: 31 August 2010
(This article belongs to the Section Chemical Sensors)
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An on-chip transformer with a ferrofluid magnetic core has been developed and tested. The transformer consists of solenoid-type coil and a magnetic core of ferrofluid, with the former fabricated by MEMS technology and the latter by a chemical co-precipitation method. The performance of the MEMS transformer with a ferrofluid magnetic core was measured and simulated with frequencies ranging from 100 kHz to 100 MHz. Experimental results reveal that the presence of the ferrofluid increases the inductance of coils and the coupling coefficient of transformer; however, it also increases the resistance owing to the lag between the external magnetic field and the magnetization of the material.
Keywords: MEMS transformer; ferrofluid MEMS transformer; ferrofluid
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Tsai, T.-H.; Kuo, L.-S.; Chen, P.-H.; Lee, D.-S.; Yang, C.-T. Applications of Ferro-Nanofluid on a Micro-Transformer. Sensors 2010, 10, 8161-8172.

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