Title :
High frequency thin-film power inductors and transformers
Author :
Cheng, D.K.W. ; Kwok, K.W. ; Mo, W.K.
Author_Institution :
Hong Kong Polytech., Hong Kong
Abstract :
In order to implement very low profile magnetic components, high frequency thin-film inductors and transformers are developed by depositing thin film of copper upon ferrite substrates and use in micro-power level. The operating frequency for the fabricated thin-film samples can be as high as 1 MHz since loss due to skin effect is still small at this frequency. Circuit simulations are provided to determine the behaviour of thin-film inductor. Furthermore, the value of inductance and Q-factor can be evaluated by the equivalent circuit model of thin film inductor. Discrepancies between the calculated and measured values are investigated and explained. Performance on voltage step up/down for the thin-film transformer is explained against different winding layouts. Suggestions on different areas to improve the performance the thin-film samples are presented
Keywords :
equivalent circuits; ferrites; high-frequency transformers; network analysis; power inductors; power transformers; transformer windings; 1 MHz; Cu; HF; Q-factor; circuit simulation; equivalent circuit model; ferrite substrates; inductance; operating frequency; performance; skin effect; thin-film power inductors; thin-film power transformers; voltage step up/down; winding layouts; Copper; Ferrites; Frequency; Magnetic films; Skin effect; Sputtering; Substrates; Thin film circuits; Thin film inductors; Transformers;
Conference_Titel :
Industrial Electronics, Control, and Instrumentation, 1993. Proceedings of the IECON '93., International Conference on
Conference_Location :
Maui, HI
Print_ISBN :
0-7803-0891-3
DOI :
10.1109/IECON.1993.338987
