Neuro-fuzzy modeling and control for magnetic field of deflection yoke

Color display tube (CDT) used in computer monitors, consists of many components. Deflection yoke (DY) among them supplies the vertical and horizontal magnetic fields so that the spatial trajectories of electron beams are deflected according to the synchronization signals. If the magnetic fields are not correctly formed, there will be color blurring or blooming by a misconvergence of each beam and the color image on screen may not be clear. Therefore, in the manufacture of DY, its quality is strictly controlled to get the desired convergence and the occurred misconvergence can be cured by sticking ferrite sheets on the inner part of DY. However, because this process requires expert's knowledge and experience, an intelligent knowledge-base controller with neuro-fuzzy modeling is introduced in this paper.