NDLI: Calculation of losses and temperature rise for high frequency transformer under forced-air convection

Content Provider	IEEE Xplore Digital Library
Author	Ren-Chun Chang Chien-Kuo Chen Chien-Yue Wang Ying-Yu Tzou
Copyright Year	2010
Description	Author affiliation: Power Electronic Systems and Chips Lab., Department of Electrical Engineering, National Chiao Tung Univ., Hsinchu, Taiwan (Ren-Chun Chang; Chien-Kuo Chen; Chien-Yue Wang; Ying-Yu Tzou)
Abstract	This paper presents a method for loss calculation, including core losses and winding losses, and temperature rise in high frequency transformer design under forced-air convection. Analytical models of winding losses for multiple-layer copper foil and Litz wire windings with MMF boundary conditions have been developed. Geometric parameters of conductor and distribution of magneto-motive forces are considered in the formulation of the winding loss equations. Comparing with the FEM simulation result, it shows that these two models can achieve good accuracy. The core losses were calculated using modified Steinmetz equation (MSE), which has been validated for power ferrite material. The winding loss models, including copper foil model and Litz wire model, were developed for multiple-layer with magneto-motive forces boundary conditions. To verify the accuracy of these two models, the 2D FEM simulation was used for comparison, and the errors of copper foil model and Litz wire model were within 1% and around 5%∼9%, respectively. The 5-R modified model for E-type core was presented as 5 resistors by thermal network to evaluate temperature rise under forced-air convection, and the heat transfer coefficients and material properties were obtained using thermal measurement in wind tunnel.
Starting Page	1
Ending Page	6
File Size	475691
Page Count	6
File Format	PDF
ISBN	9781424452255
ISSN	1553572X
DOI	10.1109/IECON.2010.5674996
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-11-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Windings Conductors Wire Copper Mathematical model Analytical models Magnetic cores Multiple-layer Winding losses Copper foil Litz wire MMF
Content Type	Text
Resource Type	Article

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