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• Tsai, T
• Kuo, L
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• Lee, D
• Yang, C
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• Chen, P
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• Yang, C
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• Lee, D
• Yang, C

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

Article

Applications of Ferro-Nanofluid on a Micro-Transformer

Tsung-Han Tsai¹ , Long-Sheng Kuo¹ , Ping-Hei Chen^1,* , Da-sheng Lee²  and Chin-Ting Yang³

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; in revised form: 20 August 2010 / Accepted: 20 August 2010 / Published: 31 August 2010

(This article belongs to the Section Physical Sensors)

Download PDF Full-Text [1333 KB, uploaded 31 August 2010 16:22 CEST]

Abstract: 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

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