engleski

Application of Ferrite Layers in Low-profile OLED Drivers

Driver of a low-profile OLED luminary due to space constraints uses a planar inductor with ferrite layers to realize desired inductive properties. This paper presents the analysis of usage of ferrite layers with single-coil and double-coil windings in the OLED driver. The model based on magnetic circuits is used to analyse the inductance and the quality factor. The influence of the winding dimensions and the ferrite layers is analysed. The analysis is verified by electromagnetic simulations and measurements. The results of VNA measurements show that the double-coil design has the maximum inductance approx. 80\% and maximum quality factor approx. 10\% larger than the single-coil design.{; ; ; ; ; ; ; ; The measurements of the planar inductors in the OLED driver show that the best-case single-coil and double-coil inductors have a similar efficiency, but the double-coil inductor has a 35\% smaller current ripple which leads to better EMC performance of the driver.}; ; ; ; ; ; ; ; It is concluded that it is sufficient that the ferrite layer covers the inductor, i.e. it does not have to be much larger than the inductor to achieve good performance.

ferrites ; inductors ; DC-DC power convertorsS

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