US EPA

2157223 

Journal Article 

Model and design of PCB parallel winding for planar transformer 

Chen, W; Yan, YP; Hu, YQ; Lu, Q 

2003 

Yes 

I E E E Transactions on Magnetics
ISSN: 0018-9464 

39 

5 

3202-3204 

10.1109/TMAG.2003.816147 

WOS:000185722100315 

In today's high-frequency low-profile switching-mode power converters, paralleling winding in planar transformers is needed, especially for low voltage and high current applications. Although this practice is believed to be effective to increase the current handling capacity of the windings, the effect might be offset due to the unequal current sharing within parallel layers if the winding layers are not properly arranged and connected. In this work, the particular problems raised from parallel winding are addressed and modeled based on a one-dimensional field model. The factors affecting winding losses with parallel connection are analyzed. Software to predict the current density distribution and ac loss for planar windings has been developed. 

electromagnetic analysis; losses; pulse-width modulated power converters; transformer windings