Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 30172
Coreless Printed Circuit Board (PCB) Stepdown Transformers for DC-DC Converter Applications

Authors: Radhika Ambatipudi, Hari Babu Kotte, Dr. Kent Bertilsson

Abstract:

In this paper, multilayered coreless printed circuit board (PCB) step-down power transformers for DC-DC converter applications have been designed, manufactured and evaluated. A set of two different circular spiral step-down transformers were fabricated in the four layered PCB. These transformers have been modelled with the assistance of high frequency equivalent circuit and characterized with both sinusoidal and square wave excitation. This paper provides the comparative results of these two different transformers in terms of their resistances, self, leakage, mutual inductances, coupling coefficient and also their energy efficiencies. The operating regions for optimal performance of these transformers for power transfer applications are determined. These transformers were tested for the output power levels of about 30 Watts within the input voltage range of 12-50 Vrms. The energy efficiency for these step down transformers is observed to be in the range of 90%-97% in MHz frequency region.

Keywords: Coreless Step down Transformer, DC-DC Converterapplications, High frequency transformer, MHz operating frequency, Multilayered PCB transformers, Power Transfer Applications.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1061236

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 4331

References:


[1] Conor Quinn, Karl Rinne, Terence O-Donnell, Maeve Duffy and Cian O Mathuna, "A review of Planar Magnetic Techniques and Technologies--, IEEE APEC 2001, pp.1175-1183.
[2] Colonel William, T.McLyman, "Transformer and Inductor design Handbook--CRC press; 3 edition.
[3] Wong, Fu Keung, "High Frequency transformers for switch mode power supplies--, Griffith University, 2004.
[4] S.C.Tang, S.Y.R .Hui and H. Chung, "Coreless Printed Circuit Board (PCB) Transformers -Fundamental characteristics and application potential", IEEE Circuits and Systems Newsletter, Vol. 11, No. 3, Third Quarter 2000, p.1, pp.3-15 and p.47.
[5] C.F.Coombs, "Printed Circuits handbooks" 5th Edition, McGraw-Hill, August 27, 2001.
[6] S.C.Tang, S.Y. (Ron) Hui and Henry Shu-Hung Chung, "Characterization of Coreless Printed Circuit Board (PCB) Transformers", IEEE Transactions on Power Electronics, Vol. 15, No. 6, November 2000,pp.1275-1282.
[7] Alex Van den Bossche and Vencislav Cekov Valchev, "Inductors and Transformers for Power Electronics"1st Edition, CRC Press, March24, 2005.
[8] Sun-Min Hwang and Tae-Young Ahn, "A ZVS forward DC-DC Converter Using Coreless PCB Transformer and Inductor", 2001.
[9] Heng-Ming Hsu, "Effective series-resistance model of spiral inductors", Microwave and Optical technology letters, vol.46, No.2, July 20, 2005. pp.107-109
[10] Robert W .Erickson, "Fundamentals of Power Electronics"2nd Edition, Springer International Edition, pp.505.
[11] S.C.Tang, S.Y.(Ron)Hui and Henry Shu-Hung Chung, "Coreless planar Printed-Circuit-Board (PCB) Transformers-A Fundamental Concept for Signal and Energy Transfer", IEEE Transactions on Power Electronics, vol 15, No.5, September 2000, pp.931-941.
[12] JAMES H.SPREEN, "Electrical Terminal Representation of Conductor Loss in Transformers", IEEE Transactions on Power Electronics, vol 5, No.4, October 1990.